/* ================================================================
   EPICTOOLIFY — DESIGN SYSTEM IMPLEMENTATION v1.1
   custom.css
   Source of truth: docs/DESIGN_SYSTEM.md
   ================================================================ */

/* ----------------------------------------------------------------
   0. DESIGN SYSTEM TOKENS — ALL VALUES DEFINED HERE
   ---------------------------------------------------------------- */
:root {

  /* SURFACE SYSTEM (Section 3) */
  --color-surface-bg:      #F7F7FA;
  --color-surface-0:       #FFFFFF;
  --color-surface-1:       #F2F2F6;
  --color-surface-2:       #EBEBEF;
  --color-surface-3:       #E2E2E7;
  --color-surface-overlay: rgba(0,0,0,0.03);

  /* BORDER SYSTEM */
  --color-border-subtle:   #E8E8ED;
  --color-border:          #D8D8DF;
  --color-border-strong:   #C4C4CC;
  --color-border-focus:    #2563EB;
  --color-divider:         rgba(0,0,0,0.06);

  /* TEXT SYSTEM */
  --color-text:            #09090B;
  --color-text-secondary:  #3F3F46;
  --color-text-muted:      #71717A;
  --color-text-subtle:     #A1A1AA;
  --color-text-inverse:    #FFFFFF;

  /* PRIMARY — FROZEN: #2563EB */
  --color-primary:         #2563EB;
  --color-primary-light:   #3B82F6;
  --color-primary-dark:    #1D4ED8;
  --color-primary-deeper:  #1E40AF;
  --color-primary-surface: #EFF6FF;
  --color-primary-border:  #BFDBFE;
  --color-primary-text:    #1E3A8A;

  /* ACCENT (Indigo — gradient partner only) */
  --color-accent:          #4F46E5;
  --color-accent-surface:  #EEF2FF;
  --color-accent-border:   #C7D2FE;
  --color-accent-text:     #3730A3;

  /* SEMANTIC */
  --color-success:         #16A34A;
  --color-success-surface: #F0FDF4;
  --color-success-border:  #BBF7D0;
  --color-success-text:    #15803D;
  --color-warning:         #D97706;
  --color-warning-surface: #FFFBEB;
  --color-warning-border:  #FDE68A;
  --color-warning-text:    #92400E;
  --color-danger:          #DC2626;
  --color-danger-surface:  #FEF2F2;
  --color-danger-border:   #FECACA;
  --color-danger-text:     #991B1B;
  --color-info:            #0284C7;
  --color-info-surface:    #F0F9FF;
  --color-info-border:     #BAE6FD;
  --color-info-text:       #0369A1;

  /* GRADIENT SYSTEM */
  --gradient-hero:    linear-gradient(150deg, #F8FAFE 0%, #EEF3FF 45%, #F5F0FE 100%);
  --gradient-primary: linear-gradient(135deg, #2563EB 0%, #4F46E5 100%);
  --gradient-cta:     linear-gradient(135deg, #1E3A8A 0%, #2563EB 60%, #4338CA 100%);
  --gradient-card:    linear-gradient(145deg, #FFFFFF 0%, #F8F8FC 100%);
  --gradient-surface: linear-gradient(180deg, #F7F7FA 0%, #FFFFFF 50%);

  /* GLASS SYSTEM */
  --color-glass-bg:     rgba(255,255,255,0.78);
  --color-glass-border: rgba(255,255,255,0.45);
  --blur-glass:         blur(16px) saturate(180%);

  /* GLOW SYSTEM */
  --glow-primary: 0 0 48px rgba(37,99,235,0.12);
  --glow-accent:  0 0 60px rgba(79,70,229,0.10);
  --glow-success: 0 0 40px rgba(22,163,74,0.14);
  --glow-warning: 0 0 40px rgba(217,119,6,0.12);
  --glow-danger:  0 0 40px rgba(220,38,38,0.12);

  /* SPECIAL PURPOSE */
  --color-formula-bg:     #F1F1F6;
  --color-formula-text:   #3F3F46;
  --color-code-bg:        #18181B;
  --color-code-text:      #E4E4E7;
  --color-ad-bg:          #F5F5FA;
  --color-ad-label:       #A1A1AA;
  --color-skeleton-base:  #E8E8ED;
  --color-skeleton-shine: #F4F4F8;
  --color-dot-grid:       rgba(37,99,235,0.04);

  /* FONTS */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  /* TYPE SCALE */
  --type-2xs:        0.625rem;
  --type-xs:         0.75rem;
  --type-sm:         0.875rem;
  --type-base:       1rem;
  --type-lg:         1.125rem;
  --type-xl:         1.25rem;
  --type-2xl:        1.5rem;
  --type-3xl:        1.875rem;
  --type-4xl:        2.25rem;
  --type-5xl:        3rem;
  --type-display:    clamp(2.5rem, 5vw + 1rem, 4rem);
  --type-display-lg: clamp(3rem, 6vw + 1.5rem, 5rem);
  --type-display-xl: clamp(3.5rem, 8vw + 1rem, 6rem);
  --type-metric:     clamp(2rem, 3.5vw + 1rem, 3.5rem);

  /* SPACING SCALE (4px base unit) */
  --space-px:   1px;
  --space-0-5:  2px;
  --space-1:    4px;
  --space-2:    8px;
  --space-3:    12px;
  --space-4:    16px;
  --space-5:    20px;
  --space-6:    24px;
  --space-7:    28px;
  --space-8:    32px;
  --space-10:   40px;
  --space-12:   48px;
  --space-14:   56px;
  --space-16:   64px;
  --space-20:   80px;
  --space-24:   96px;
  --space-28:   112px;
  --space-32:   128px;

  /* CONTAINER WIDTHS */
  --container-reading: 640px;
  --container-content: 760px;
  --container-tool:    860px;
  --container-base:    1200px;
  --container-wide:    1400px;
  --width-calculator:  560px;
  --width-hero-text:   840px;

  /* BORDER RADIUS */
  --radius-none: 0;
  --radius-xs:   4px;
  --radius-sm:   6px;
  --radius-md:   8px;
  --radius:      10px;
  --radius-lg:   14px;
  --radius-xl:   20px;
  --radius-2xl:  28px;
  --radius-3xl:  40px;
  --radius-full: 9999px;

  /* SHADOW SYSTEM */
  --shadow-none:       none;
  --shadow-xs:         0 1px 2px rgba(0,0,0,0.04);
  --shadow-sm:         0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.05);
  --shadow:            0 4px 8px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.05);
  --shadow-md:         0 8px 16px rgba(0,0,0,0.08), 0 4px 6px rgba(0,0,0,0.05);
  --shadow-lg:         0 16px 32px rgba(0,0,0,0.10), 0 8px 12px rgba(0,0,0,0.05);
  --shadow-xl:         0 24px 48px rgba(0,0,0,0.14), 0 12px 24px rgba(0,0,0,0.06);
  --shadow-inner:      inset 0 2px 4px rgba(0,0,0,0.05);
  --shadow-focus:      0 0 0 2px #FFFFFF, 0 0 0 4px rgba(37,99,235,0.30);
  --shadow-card-hover: 0 2px 4px rgba(0,0,0,0.04), 0 8px 20px rgba(0,0,0,0.08), 0 0 0 1px rgba(0,0,0,0.03);
  --shadow-panel:      0 4px 6px rgba(0,0,0,0.04), 0 12px 28px rgba(0,0,0,0.07), 0 0 0 1px rgba(0,0,0,0.03);
  --shadow-modal:      0 8px 16px rgba(0,0,0,0.08), 0 32px 64px rgba(0,0,0,0.14), 0 0 0 1px rgba(0,0,0,0.04);

  /* MOTION TOKENS */
  --ease-out:    cubic-bezier(0, 0, 0.2, 1);
  --ease-in:     cubic-bezier(0.4, 0, 1, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-instant:  50ms;
  --dur-fast:    100ms;
  --dur-normal:  150ms;
  --dur-slow:    200ms;
  --dur-slower:  300ms;
  --dur-enter:   350ms;
  --dur-loading: 1400ms;
}


/* ----------------------------------------------------------------
   1. BOOTSTRAP VARIABLE OVERRIDES
   ---------------------------------------------------------------- */
:root {
  --bs-primary:          var(--color-primary);
  --bs-primary-rgb:      37, 99, 235;
  --bs-body-bg:          var(--color-surface-bg);
  --bs-body-color:       var(--color-text);
  --bs-body-font-family: var(--font-sans);
  --bs-body-font-size:   var(--type-base);
  --bs-body-line-height: 1.6;
  --bs-border-color:     var(--color-border-subtle);
  --bs-border-radius:    var(--radius);
  --bs-border-radius-sm: var(--radius-sm);
  --bs-border-radius-lg: var(--radius-lg);
  --bs-link-color:           var(--color-primary);
  --bs-link-hover-color:     var(--color-primary-dark);
  --bs-link-decoration:      none;
  --bs-link-hover-decoration:underline;
  --bs-success: var(--color-success);
  --bs-danger:  var(--color-danger);
  --bs-warning: var(--color-warning);
  --bs-info:    var(--color-info);
}


/* ----------------------------------------------------------------
   2. DARK MODE OVERRIDES
   ---------------------------------------------------------------- */
[data-theme="dark"] {
  --color-surface-bg:      #09090B;
  --color-surface-0:       #111113;
  --color-surface-1:       #18181B;
  --color-surface-2:       #222226;
  --color-surface-3:       #2C2C32;
  --color-surface-overlay: rgba(255,255,255,0.04);
  --color-border-subtle:   #27272A;
  --color-border:          #3F3F46;
  --color-border-strong:   #52525B;
  --color-text:            #FAFAFA;
  --color-text-secondary:  #D4D4D8;
  --color-text-muted:      #A1A1AA;
  --color-text-subtle:     #71717A;
  --color-primary:         #3B82F6;
  --color-primary-light:   #60A5FA;
  --color-primary-dark:    #2563EB;
  --color-primary-surface: rgba(59,130,246,0.10);
  --color-primary-border:  rgba(59,130,246,0.25);
  --color-primary-text:    #93C5FD;
  --color-success-surface: rgba(22,163,74,0.10);
  --color-success-border:  rgba(22,163,74,0.25);
  --color-success-text:    #4ADE80;
  --color-warning-surface: rgba(217,119,6,0.10);
  --color-warning-border:  rgba(217,119,6,0.25);
  --color-warning-text:    #FCD34D;
  --color-danger-surface:  rgba(220,38,38,0.10);
  --color-danger-border:   rgba(220,38,38,0.25);
  --color-danger-text:     #FCA5A5;
  --gradient-hero:    linear-gradient(150deg, #0D0D14 0%, #0F1420 50%, #10111A 100%);
  --gradient-card:    linear-gradient(145deg, #18181B 0%, #1C1C21 100%);
  --color-glass-bg:     rgba(9,9,11,0.80);
  --color-glass-border: rgba(255,255,255,0.08);
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.30), 0 1px 2px rgba(0,0,0,0.20);
  --shadow:     0 4px 8px rgba(0,0,0,0.30), 0 2px 4px rgba(0,0,0,0.20);
  --shadow-md:  0 8px 16px rgba(0,0,0,0.40), 0 4px 6px rgba(0,0,0,0.25);
  --shadow-lg:  0 16px 32px rgba(0,0,0,0.50), 0 8px 12px rgba(0,0,0,0.30);
  --shadow-focus: 0 0 0 2px #09090B, 0 0 0 4px rgba(59,130,246,0.40);
  --shadow-card-hover: 0 2px 4px rgba(0,0,0,0.20), 0 8px 20px rgba(0,0,0,0.35), 0 0 0 1px rgba(255,255,255,0.05);
  --shadow-panel: 0 4px 6px rgba(0,0,0,0.20), 0 12px 28px rgba(0,0,0,0.40), 0 0 0 1px rgba(255,255,255,0.05);
  --color-formula-bg:  #1A1A1E;
  --color-formula-text:#D4D4D8;
  --color-ad-bg:       #111113;
  --color-skeleton-base:  #27272A;
  --color-skeleton-shine: #3F3F46;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-surface-bg:      #09090B;
    --color-surface-0:       #111113;
    --color-surface-1:       #18181B;
    --color-surface-2:       #222226;
    --color-surface-3:       #2C2C32;
    --color-border-subtle:   #27272A;
    --color-border:          #3F3F46;
    --color-border-strong:   #52525B;
    --color-text:            #FAFAFA;
    --color-text-secondary:  #D4D4D8;
    --color-text-muted:      #A1A1AA;
    --color-text-subtle:     #71717A;
    --color-primary:         #3B82F6;
    --color-primary-surface: rgba(59,130,246,0.10);
    --color-primary-border:  rgba(59,130,246,0.25);
    --color-primary-text:    #93C5FD;
    --color-success-surface: rgba(22,163,74,0.10);
    --color-success-border:  rgba(22,163,74,0.25);
    --color-success-text:    #4ADE80;
    --color-warning-surface: rgba(217,119,6,0.10);
    --color-warning-border:  rgba(217,119,6,0.25);
    --color-warning-text:    #FCD34D;
    --color-danger-surface:  rgba(220,38,38,0.10);
    --color-danger-border:   rgba(220,38,38,0.25);
    --color-danger-text:     #FCA5A5;
    --gradient-hero:    linear-gradient(150deg, #0D0D14 0%, #0F1420 50%, #10111A 100%);
    --gradient-card:    linear-gradient(145deg, #18181B 0%, #1C1C21 100%);
    --color-glass-bg:     rgba(9,9,11,0.80);
    --color-glass-border: rgba(255,255,255,0.08);
    --shadow-focus: 0 0 0 2px #09090B, 0 0 0 4px rgba(59,130,246,0.40);
    --color-skeleton-base:  #27272A;
    --color-skeleton-shine: #3F3F46;
  }
}


/* ----------------------------------------------------------------
   3. BASE RESET & GLOBAL
   ---------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--type-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-surface-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  color: var(--color-text);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 0;
}

h1 { font-size: clamp(2.25rem, 5vw, var(--type-5xl)); letter-spacing: -0.03em; }
h2 { font-size: clamp(1.875rem, 4vw, var(--type-4xl)); letter-spacing: -0.02em; }
h3 { font-size: clamp(1.5rem, 3vw, var(--type-3xl)); font-weight: 600; letter-spacing: -0.01em; }
h4 { font-size: var(--type-2xl); font-weight: 600; letter-spacing: 0; }
h5 { font-size: var(--type-xl); font-weight: 600; }

p { color: var(--color-text-secondary); }

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--dur-normal) var(--ease-out);
}

a:hover { color: var(--color-primary-dark); }

a:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
  border-radius: var(--radius-sm);
}

img { max-width: 100%; height: auto; display: block; }

/* ----------------------------------------------------------------
   4. SKIP LINK
   ---------------------------------------------------------------- */
.et-skip-link {
  position: absolute;
  top: var(--space-4);
  left: var(--space-4);
  z-index: 9999;
  padding: var(--space-3) var(--space-5);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-md);
  font-size: var(--type-sm);
  font-weight: 600;
  transform: translateY(-200%);
  transition: transform var(--dur-normal) var(--ease-out);
}

.et-skip-link:focus {
  transform: translateY(0);
  color: var(--color-text-inverse);
}

/* ----------------------------------------------------------------
   5. READING PROGRESS (blog pages)
   ---------------------------------------------------------------- */
.et-reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--gradient-primary);
  z-index: 1100;
  transition: width 80ms linear;
}

/* ----------------------------------------------------------------
   6. NAVBAR
   ---------------------------------------------------------------- */
.et-navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-surface-0);
  border-bottom: 1px solid var(--color-border-subtle);
  height: 64px;
  display: flex;
  align-items: center;
  transition:
    background-color var(--dur-slow) var(--ease-out),
    border-color var(--dur-slow) var(--ease-out),
    box-shadow var(--dur-slow) var(--ease-out);
}

.et-navbar--scrolled {
  background-color: var(--color-glass-bg);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  border-color: var(--color-glass-border);
  box-shadow: 0 4px 24px rgba(0,0,0,0.06);
}

@supports not (backdrop-filter: blur(1px)) {
  .et-navbar--scrolled {
    background-color: var(--color-surface-0);
  }
}

.et-navbar .container {
  max-width: var(--container-base);
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.et-navbar__brand {
  font-size: var(--type-xl);
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--color-text);
  text-decoration: none;
  line-height: 1;
  transition: color var(--dur-normal) var(--ease-out);
}

.et-navbar__brand:hover {
  color: var(--color-primary);
}

.et-navbar__nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
  margin: 0;
  padding: 0;
}

.et-navbar__link {
  font-size: var(--type-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--dur-normal) var(--ease-out);
}

.et-navbar__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--dur-normal) var(--ease-out);
  border-radius: var(--radius-full);
}

.et-navbar__link:hover,
.et-navbar__link.is-active {
  color: var(--color-text);
}

.et-navbar__link.is-active::after,
.et-navbar__link:hover::after {
  transform: scaleX(1);
}

.et-navbar__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.et-navbar__toggle {
  display: none;
  border: none;
  background: none;
  padding: var(--space-2);
  cursor: pointer;
  color: var(--color-text);
  border-radius: var(--radius-md);
  transition: background-color var(--dur-fast) var(--ease-out);
}

.et-navbar__toggle:hover {
  background-color: var(--color-surface-1);
}

/* Mobile nav — right-side drawer */
.et-mobile-nav {
  display: none;
  background-color: var(--color-surface-0);
  border-bottom: 1px solid var(--color-border-subtle);
  padding: var(--space-4) 0;
}

.et-mobile-nav.is-open {
  display: block;
}

.et-mobile-nav__link {
  display: block;
  padding: var(--space-4) var(--space-6);
  font-size: var(--type-lg);
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  transition: background-color var(--dur-fast) var(--ease-out);
}

.et-mobile-nav__link:hover {
  background-color: var(--color-surface-1);
}

/* Mobile nav header (close row) */
.et-mobile-nav__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--color-border-subtle);
  margin-bottom: var(--space-2);
}

.et-mobile-nav__title {
  font-size: var(--type-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.et-mobile-nav__close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  background: none;
  color: var(--color-text-secondary);
  cursor: pointer;
  border-radius: var(--radius-md);
  font-size: var(--type-2xl);
  transition: background-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}

.et-mobile-nav__close:hover {
  background-color: var(--color-surface-1);
  color: var(--color-text);
}

/* Navigation backdrop */
.et-nav-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--dur-slow) var(--ease-out),
    visibility var(--dur-slow) var(--ease-out);
}

.et-nav-backdrop.is-open {
  opacity: 1;
  visibility: visible;
}

@media (max-width: 767px) {
  /* Hamburger left, logo center (absolute), toggle right */
  .et-navbar .container {
    position: relative;
  }
  .et-navbar__nav,
  .et-navbar__actions .et-btn--sm {
    display: none;
  }
  .et-navbar__brand {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    white-space: nowrap;
  }
  .et-navbar__toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    min-width: 44px;
    min-height: 44px;
    border: 1.5px solid var(--color-border);
    background: var(--color-surface-1);
  }

  /* Right-side drawer */
  .et-mobile-nav {
    display: block;
    position: fixed;
    top: 0;
    right: -100%;
    width: min(320px, 85vw);
    height: 100dvh;
    background: var(--color-surface-0);
    border-left: 1px solid var(--color-border-subtle);
    border-bottom: none;
    box-shadow: var(--shadow-xl);
    padding: 0;
    overflow-y: auto;
    z-index: 1001;
    transition: right var(--dur-slow) var(--ease-out);
  }

  .et-mobile-nav.is-open {
    right: 0;
  }

  .et-mobile-nav__link {
    border-bottom: 1px solid var(--color-border-subtle);
    min-height: 52px;
    display: flex;
    align-items: center;
  }

  .et-mobile-nav__link:last-child {
    border-bottom: none;
  }
}

/* ----------------------------------------------------------------
   7. BUTTONS
   ---------------------------------------------------------------- */
.et-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: var(--type-sm);
  letter-spacing: 0.01em;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition:
    background-color var(--dur-fast) var(--ease-out),
    color var(--dur-fast) var(--ease-out),
    box-shadow var(--dur-normal) var(--ease-out),
    transform var(--dur-instant) var(--ease-spring),
    border-color var(--dur-fast) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.et-btn:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

.et-btn:active {
  transform: scale(0.97);
}

/* Sizes */
.et-btn--sm {
  height: 36px;
  padding: 0 var(--space-4);
  font-size: var(--type-sm);
  border-radius: var(--radius-md);
}

.et-btn--md {
  height: 44px;
  padding: 0 var(--space-5);
  font-size: var(--type-sm);
}

.et-btn--lg {
  height: 52px;
  padding: 0 var(--space-7);
  font-size: var(--type-base);
  border-radius: var(--radius-md);
}

.et-btn--xl {
  height: 60px;
  padding: 0 var(--space-8);
  font-size: var(--type-lg);
  border-radius: var(--radius-md);
}

.et-btn--full { width: 100%; }

/* Primary */
.et-btn--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-sm);
}

.et-btn--primary:hover {
  background: var(--color-primary-dark);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-md);
}

.et-btn--primary:active {
  background: var(--color-primary-deeper);
  box-shadow: var(--shadow-inner);
}

/* Gradient Primary (hero use only) */
.et-btn--gradient {
  background: var(--gradient-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-sm), var(--glow-primary);
}

.et-btn--gradient:hover {
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-md), var(--glow-primary);
  filter: brightness(1.05);
}

/* Secondary */
.et-btn--secondary {
  background: var(--color-surface-0);
  color: var(--color-text);
  border: 1.5px solid var(--color-border-subtle);
  box-shadow: var(--shadow-xs);
}

.et-btn--secondary:hover {
  border-color: var(--color-border);
  background: var(--color-surface-1);
  color: var(--color-text);
  box-shadow: var(--shadow-sm);
}

/* Ghost */
.et-btn--ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border: none;
}

.et-btn--ghost:hover {
  background: var(--color-surface-overlay);
  color: var(--color-text);
}

/* Outline */
.et-btn--outline {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary-border);
}

.et-btn--outline:hover {
  background: var(--color-primary-surface);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* Disabled */
.et-btn[disabled],
.et-btn.is-disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

/* Loading */
.et-btn.is-loading {
  pointer-events: none;
}

.et-btn.is-loading .et-btn__text {
  visibility: hidden;
}

.et-btn.is-loading::after {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255,255,255,0.4);
  border-top-color: white;
  border-radius: 50%;
  animation: et-spin 0.7s linear infinite;
}

/* ----------------------------------------------------------------
   8. FORM ELEMENTS
   ---------------------------------------------------------------- */
.et-form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.et-label {
  font-size: var(--type-sm);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.2;
}

.et-label__required {
  color: var(--color-danger);
  margin-left: 3px;
}

.et-input {
  width: 100%;
  height: 56px;
  padding: 0 var(--space-5);
  font-family: var(--font-sans);
  font-size: var(--type-lg);
  font-weight: 400;
  color: var(--color-text);
  background-color: var(--color-surface-0);
  border: 1.5px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-inner);
  transition:
    border-color var(--dur-normal) var(--ease-out),
    box-shadow var(--dur-normal) var(--ease-out);
  -webkit-appearance: none;
  -moz-appearance: textfield;
  appearance: none;
}

.et-input::-webkit-outer-spin-button,
.et-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.et-input::placeholder {
  color: var(--color-text-subtle);
}

.et-input:hover {
  border-color: var(--color-border);
}

.et-input:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: var(--shadow-focus);
}

.et-input.is-error {
  border-color: var(--color-danger-border);
  box-shadow: 0 0 0 2px var(--color-surface-0), 0 0 0 4px rgba(220,38,38,0.25);
}

.et-help-text {
  font-size: var(--type-xs);
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* Prevent author display values from overriding the HTML hidden attribute */
[hidden] { display: none !important; }

.et-error-text {
  font-size: var(--type-sm);
  font-weight: 500;
  color: var(--color-danger-text);
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

/* Unit toggle */
.et-unit-toggle {
  display: inline-flex;
  flex-wrap: wrap;
  max-width: 100%;
  background: var(--color-surface-1);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-full);
  padding: var(--space-1);
  gap: var(--space-1);
}

.et-unit-toggle__btn {
  padding: var(--space-1) var(--space-3);
  font-size: var(--type-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  background: none;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--dur-normal) var(--ease-out);
  letter-spacing: 0.02em;
}

.et-unit-toggle__btn.is-active {
  background: var(--color-primary-surface);
  color: var(--color-primary);
}

/* ---- Input addon (fused prefix / suffix label beside input) ---- */
.et-input-addon {
  display: flex;
  align-items: stretch;
}

.et-input-addon__prefix,
.et-input-addon__suffix {
  display: flex;
  align-items: center;
  padding: 0 var(--space-4);
  background: var(--color-surface-1);
  border: 1.5px solid var(--color-border-subtle);
  font-size: var(--type-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  white-space: nowrap;
  flex-shrink: 0;
  transition: border-color var(--dur-normal) var(--ease-out);
}

.et-input-addon__prefix {
  border-right: none;
  border-radius: var(--radius-md) 0 0 var(--radius-md);
}

.et-input-addon__suffix {
  border-left: none;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.et-input-addon .et-input {
  flex: 1;
  min-width: 0;
}

/* Modifier applied to the input itself to drop the shared border + radius */
.et-input-addon .et-input--prefix {
  border-left: none;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.et-input-addon .et-input--suffix {
  border-right: none;
  border-radius: var(--radius-md) 0 0 var(--radius-md);
}

/* Carry focus ring through to the fused addon label */
.et-input-addon:focus-within .et-input-addon__prefix,
.et-input-addon:focus-within .et-input-addon__suffix {
  border-color: var(--color-border-focus);
}

/* ---- Label row (label + inline control such as unit toggle) ---- */
.et-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* ----------------------------------------------------------------
   9. SEARCH BAR
   .et-search-bar          — transparent flex wrapper
   .et-search-bar__field   — pill-shaped input surface (owns border/shadow)
   .et-search-bar__btn     — circular gradient button outside the pill
   .et-search-suggestions  — floating dropdown panel below the field
   ---------------------------------------------------------------- */

/* ---- Wrapper ---- */
.et-search-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  position: relative;
  max-width: 600px;
  margin: 0 auto;
}

/* ---- Pill field ---- */
.et-search-bar__field {
  flex: 1;
  min-width: 0; /* flex items default to min-width:auto, which was blocking
    this field from shrinking enough on narrow viewports, pushing the fixed-
    width search button outside the container (mobile horizontal overflow) */
  display: flex;
  align-items: center;
  position: relative;
  background: var(--color-surface-0);
  border: 1.5px solid var(--color-border-subtle);
  border-radius: var(--radius-full);
  box-shadow:
    0 1px 2px rgba(0,0,0,0.04),
    0 4px 16px rgba(0,0,0,0.06),
    inset 0 1px 0 rgba(255,255,255,0.80);
  transition:
    border-color 200ms ease,
    box-shadow 200ms ease;
}

.et-search-bar__field:hover {
  border-color: var(--color-border);
  box-shadow:
    0 1px 2px rgba(0,0,0,0.05),
    0 6px 20px rgba(0,0,0,0.08),
    inset 0 1px 0 rgba(255,255,255,0.80);
}

.et-search-bar__field:focus-within {
  border-color: var(--color-primary);
  box-shadow:
    0 0 0 4px rgba(37,99,235,0.12),
    0 4px 16px rgba(0,0,0,0.08),
    inset 0 1px 0 rgba(255,255,255,0.80);
}

/* ---- Search icon ---- */
.et-search-bar__icon {
  position: absolute;
  left: var(--space-5);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  pointer-events: none;
  display: flex;
  align-items: center;
  font-size: 18px;
  transition: color 200ms ease;
}

.et-search-bar__field:focus-within .et-search-bar__icon {
  color: var(--color-primary);
}

/* ---- Input ---- */
.et-search-bar__input {
  flex: 1;
  min-width: 0;
  height: 60px;
  padding: 0 var(--space-6) 0 calc(var(--space-5) + 24px + var(--space-3));
  font-family: var(--font-sans);
  font-size: var(--type-base);
  font-weight: 400;
  color: var(--color-text);
  background: transparent;
  border: none;
  border-radius: var(--radius-full);
  outline: none;
  box-shadow: none;
  -webkit-appearance: none;
  appearance: none;
}

.et-search-bar__input::placeholder {
  color: var(--color-text-subtle);
}

/* ---- Circular gradient button ---- */
.et-search-bar__btn {
  flex-shrink: 0;
  width: 60px;
  height: 60px;
  border-radius: var(--radius-full);
  background: var(--gradient-primary);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-inverse);
  font-size: 20px;
  text-decoration: none;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.20),
    0 4px 14px rgba(37,99,235,0.35),
    0 1px 3px rgba(0,0,0,0.12);
  transition:
    filter 200ms ease,
    box-shadow 200ms ease,
    transform 80ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.et-search-bar__btn:hover {
  color: var(--color-text-inverse);
  filter: brightness(1.08);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.20),
    0 6px 22px rgba(37,99,235,0.42),
    0 2px 6px rgba(0,0,0,0.12);
}

.et-search-bar__btn:active {
  transform: scale(0.91);
  filter: brightness(0.98);
}

.et-search-bar__btn:focus-visible {
  outline: none;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.20),
    0 0 0 3px #fff,
    0 0 0 5px rgba(37,99,235,0.50);
}

/* ---- Suggestions dropdown ---- */
.et-search-suggestions {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  right: calc(60px + 10px);
  background: rgba(255,255,255,0.96);
  border: 1px solid rgba(0,0,0,0.07);
  border-radius: var(--radius-xl);
  box-shadow:
    0 0 0 1px rgba(0,0,0,0.03),
    0 8px 24px rgba(0,0,0,0.08),
    0 28px 56px rgba(0,0,0,0.11);
  padding: var(--space-4) var(--space-4) var(--space-3);
  /* Hidden state — animated via opacity + transform */
  opacity: 0;
  transform: translateY(-6px) scale(0.97);
  transform-origin: top center;
  pointer-events: none;
  visibility: hidden;
  transition:
    opacity 180ms ease,
    transform 180ms ease,
    visibility 0ms linear 180ms;
  z-index: 200;
}

@supports (backdrop-filter: blur(1px)) {
  .et-search-suggestions {
    background: rgba(255,255,255,0.88);
    backdrop-filter: blur(24px) saturate(200%);
    -webkit-backdrop-filter: blur(24px) saturate(200%);
  }
}

/* Open state */
.et-search-bar.is-focused .et-search-suggestions {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
  visibility: visible;
  transition:
    opacity 180ms ease,
    transform 180ms ease,
    visibility 0ms linear 0ms;
}

/* ---- Suggestions grid ---- */
.et-search-suggestions__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-1) var(--space-2);
  margin-bottom: var(--space-2);
}

.et-search-suggestions__col {
  min-width: 0;
}

.et-search-suggestions__col + .et-search-suggestions__col {
  border-left: 1px solid var(--color-divider);
  padding-left: var(--space-4);
}

/* ---- Section heading ---- */
.et-search-suggestions__heading {
  font-size: var(--type-2xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-subtle);
  padding: var(--space-1) var(--space-2);
  margin-bottom: var(--space-1);
}

/* ---- List ---- */
.et-search-suggestions__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

/* ---- Item — stagger-ready ---- */
.et-search-suggestions__item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-2);
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  /* Stagger entry: items start translated down + invisible */
  translate: 0px 6px;
  opacity: 0;
  transition:
    background-color 120ms ease,
    translate 180ms ease,
    opacity 180ms ease;
}

.et-search-bar.is-focused .et-search-suggestions__item {
  translate: 0px 0px;
  opacity: 1;
}

.et-search-bar.is-focused .et-search-suggestions__item:hover,
.et-search-bar.is-focused .et-search-suggestions__item.is-active {
  background: var(--color-primary-surface);
  translate: 4px 0px;
}

/* ---- Item: icon ---- */
.et-search-suggestions__item-icon {
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 13px;
  transition: background-color 120ms ease;
}

.et-search-suggestions__item-icon--primary { background: var(--color-primary-surface); color: var(--color-primary); }
.et-search-suggestions__item-icon--success  { background: var(--color-success-surface); color: var(--color-success); }
.et-search-suggestions__item-icon--warning  { background: var(--color-warning-surface); color: var(--color-warning); }
.et-search-suggestions__item-icon--accent   { background: var(--color-accent-surface);  color: var(--color-accent);  }
.et-search-suggestions__item-icon--danger   { background: var(--color-danger-surface);  color: var(--color-danger);  }

/* ---- Item: text ---- */
.et-search-suggestions__item-content {
  flex: 1;
  min-width: 0;
}

.et-search-suggestions__item-name {
  display: block;
  font-size: var(--type-sm);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.3;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.et-search-suggestions__item-meta {
  display: block;
  font-size: var(--type-xs);
  color: var(--color-text-muted);
  margin-top: 1px;
  line-height: 1.3;
}

/* ---- Item: arrow indicator ---- */
.et-search-suggestions__item-arrow {
  color: var(--color-text-subtle);
  opacity: 0;
  font-size: 11px;
  flex-shrink: 0;
  transition: opacity 120ms ease, color 120ms ease;
}

.et-search-suggestions__item:hover .et-search-suggestions__item-arrow,
.et-search-suggestions__item.is-active .et-search-suggestions__item-arrow {
  opacity: 1;
  color: var(--color-primary);
}

/* ---- Footer ---- */
.et-search-suggestions__footer {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-divider);
}

.et-search-suggestions__footer-label {
  font-size: var(--type-xs);
  color: var(--color-text-subtle);
  font-weight: 500;
}

.et-search-suggestions__shortcut {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 2px var(--space-3);
  font-size: var(--type-xs);
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-surface-1);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-full);
  text-decoration: none;
  line-height: 1.7;
  transition: background-color 120ms ease, border-color 120ms ease, color 120ms ease;
}

.et-search-suggestions__shortcut:hover {
  background: var(--color-primary-surface);
  border-color: var(--color-primary-border);
  color: var(--color-primary-text);
}

/* ---- Keyboard hint ---- */
.et-search-suggestions__kbd-hint {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: var(--type-2xs);
  color: var(--color-text-subtle);
  white-space: nowrap;
}

.et-search-suggestions__kbd-hint kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 16px;
  padding: 0 3px;
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--color-text-muted);
  background: var(--color-surface-1);
  border: 1px solid var(--color-border);
  border-bottom-width: 2px;
  border-radius: var(--radius-xs);
  line-height: 1;
}

/* ---- Dark mode overrides ---- */
[data-theme="dark"] .et-search-bar__field {
  box-shadow:
    0 1px 2px rgba(0,0,0,0.25),
    0 4px 16px rgba(0,0,0,0.30),
    inset 0 1px 0 rgba(255,255,255,0.05);
}

[data-theme="dark"] .et-search-suggestions {
  background: rgba(17,17,19,0.95);
  border-color: rgba(255,255,255,0.08);
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.04),
    0 8px 24px rgba(0,0,0,0.40),
    0 28px 56px rgba(0,0,0,0.55);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .et-search-bar__field {
    box-shadow:
      0 1px 2px rgba(0,0,0,0.25),
      0 4px 16px rgba(0,0,0,0.30),
      inset 0 1px 0 rgba(255,255,255,0.05);
  }
  :root:not([data-theme="light"]) .et-search-suggestions {
    background: rgba(17,17,19,0.95);
    border-color: rgba(255,255,255,0.08);
    box-shadow:
      0 0 0 1px rgba(255,255,255,0.04),
      0 8px 24px rgba(0,0,0,0.40),
      0 28px 56px rgba(0,0,0,0.55);
  }
}

/* ---- Mobile ---- */
@media (max-width: 575px) {
  .et-search-bar__input  { height: 52px; }
  .et-search-bar__btn    { width: 52px; height: 52px; font-size: 18px; }
  .et-search-suggestions {
    right: 0;
    max-height: 65vh;
    overflow-y: auto;
  }
  .et-search-suggestions__grid { grid-template-columns: 1fr; }
  .et-search-suggestions__col + .et-search-suggestions__col {
    border-left: none;
    border-top: 1px solid var(--color-divider);
    padding-left: 0;
    padding-top: var(--space-3);
    margin-top: var(--space-2);
  }
  .et-search-suggestions__kbd-hint { display: none; }
}

/* ---- Live search states ---- */

/* is-staggering: resets items so newly injected results can animate in.
   Same specificity as is-focused rule — wins by source order (later). */
.et-search-bar.is-staggering .et-search-suggestions__item {
  translate: 0px 6px;
  opacity: 0;
}

/* Matched query text inside result names */
.et-sug-highlight {
  background: none;
  color: var(--color-primary);
  font-weight: 700;
}

/* Empty state (no results) */
.et-sug-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-8) var(--space-4) var(--space-6);
  gap: var(--space-2);
}

.et-sug-empty__icon {
  display: block;
  font-size: 28px;
  color: var(--color-text-subtle);
  margin-bottom: var(--space-1);
}

.et-sug-empty__title {
  font-size: var(--type-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  margin: 0;
}

.et-sug-empty__hint {
  font-size: var(--type-xs);
  color: var(--color-text-muted);
  margin: 0;
}

/* Popular supplement (shown below sparse results) */
.et-sug-supplement {
  padding-top: var(--space-3);
  margin-top: var(--space-3);
  border-top: 1px solid var(--color-divider);
}

/* ----------------------------------------------------------------
   10. TYPOGRAPHY UTILITIES
   ---------------------------------------------------------------- */
.et-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--type-xs);
  font-weight: 600;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  line-height: 1;
}

.et-section-label {
  font-size: var(--type-sm);
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--color-primary-text);
  margin-bottom: var(--space-3);
  display: block;
}

.et-lead {
  font-size: var(--type-lg);
  color: var(--color-text-secondary);
  line-height: 1.65;
}

.et-text-muted {
  color: var(--color-text-muted) !important;
}

.et-text-secondary {
  color: var(--color-text-secondary) !important;
}

/* ----------------------------------------------------------------
   11. BADGES & CHIPS
   ---------------------------------------------------------------- */
.et-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: var(--type-xs);
  font-weight: 600;
  letter-spacing: 0.04em;
  border-radius: var(--radius-full);
  line-height: 1;
  white-space: nowrap;
}

.et-badge--primary {
  background: var(--color-primary-surface);
  color: var(--color-primary-text);
  border: 1px solid var(--color-primary-border);
}

.et-badge--success {
  background: var(--color-success-surface);
  color: var(--color-success-text);
  border: 1px solid var(--color-success-border);
}

.et-badge--warning {
  background: var(--color-warning-surface);
  color: var(--color-warning-text);
  border: 1px solid var(--color-warning-border);
}

.et-badge--danger {
  background: var(--color-danger-surface);
  color: var(--color-danger-text);
  border: 1px solid var(--color-danger-border);
}

.et-badge--info {
  background: var(--color-info-surface);
  color: var(--color-info-text);
  border: 1px solid var(--color-info-border);
}

.et-badge--neutral {
  background: var(--color-surface-1);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border-subtle);
}

.et-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  font-size: var(--type-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-surface-0);
  border: 1.5px solid var(--color-border-subtle);
  border-radius: var(--radius-full);
  cursor: pointer;
  text-decoration: none;
  transition:
    color var(--dur-normal) var(--ease-out),
    background-color var(--dur-normal) var(--ease-out),
    border-color var(--dur-normal) var(--ease-out);
}

.et-chip:hover,
.et-chip.is-active {
  color: var(--color-primary);
  background: var(--color-primary-surface);
  border-color: var(--color-primary-border);
}

/* ----------------------------------------------------------------
   12. HERO SECTION
   ---------------------------------------------------------------- */
.et-hero {
  background: var(--gradient-hero);
  background-image:
    radial-gradient(circle, var(--color-dot-grid) 1px, transparent 1px),
    var(--gradient-hero);
  background-size: 24px 24px, 100% 100%;
  padding: var(--space-24) 0 var(--space-20);
  text-align: center;
}

.et-hero__eyebrow-wrap {
  margin-bottom: var(--space-5);
}

.et-hero__eyebrow-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-4);
  background: var(--color-primary-surface);
  border: 1px solid var(--color-primary-border);
  border-radius: var(--radius-full);
  font-size: var(--type-sm);
  font-weight: 600;
  color: var(--color-primary-text);
}

.et-hero__headline {
  font-size: var(--type-display-lg);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.05;
  color: var(--color-text);
  max-width: var(--width-hero-text);
  margin: 0 auto var(--space-5);
}

.et-hero__subtitle {
  font-size: var(--type-lg);
  color: var(--color-text-secondary);
  max-width: 52ch;
  margin: 0 auto var(--space-8);
  line-height: 1.65;
}

.et-hero__search-wrap {
  margin-bottom: var(--space-5);
}

.et-hero__popular {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}

.et-hero__popular-label {
  font-size: var(--type-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
}

.et-hero__actions {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-top: var(--space-6);
}

/* ----------------------------------------------------------------
   13. SECTION WRAPPER
   ---------------------------------------------------------------- */
.et-section {
  padding: var(--space-20) 0;
}

.et-section--alt {
  background: var(--color-surface-1);
}

.et-section--dark {
  background: var(--gradient-cta);
}

.et-section__header {
  margin-bottom: var(--space-10);
}

.et-section__header--center {
  text-align: center;
}

.et-section__title {
  font-size: clamp(1.875rem, 3vw, var(--type-4xl));
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.et-section__lead {
  font-size: var(--type-lg);
  color: var(--color-text-secondary);
  max-width: 56ch;
  line-height: 1.65;
}

.et-section--dark .et-section__title,
.et-section--dark .et-section__lead {
  color: var(--color-text-inverse);
}

.et-section--dark .et-section__lead {
  opacity: 0.80;
}

/* ----------------------------------------------------------------
   14. CARDS — TOOL CARD
   ---------------------------------------------------------------- */
.et-tool-card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface-0);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  text-decoration: none;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition:
    transform var(--dur-slow) var(--ease-out),
    box-shadow var(--dur-slow) var(--ease-out),
    border-color var(--dur-slow) var(--ease-out);
}

.et-tool-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-slow) var(--ease-out);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.et-tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-border);
  text-decoration: none;
}

.et-tool-card:hover::before {
  transform: scaleX(1);
}

.et-tool-card__icon-badge {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-xl);
  background: var(--color-primary-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
  color: var(--color-primary);
  flex-shrink: 0;
  transition: background-color var(--dur-normal) var(--ease-out);
}

.et-tool-card:hover .et-tool-card__icon-badge {
  background: var(--color-primary-border);
}

.et-tool-card__eyebrow {
  font-size: var(--type-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

.et-tool-card__title {
  font-size: var(--type-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
  line-height: 1.3;
  transition: color var(--dur-normal) var(--ease-out);
}

.et-tool-card:hover .et-tool-card__title {
  color: var(--color-primary);
}

.et-tool-card__desc {
  font-size: var(--type-sm);
  color: var(--color-text-muted);
  line-height: 1.55;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.et-tool-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--space-5);
}

.et-tool-card__arrow {
  color: var(--color-text-subtle);
  transition: color var(--dur-normal) var(--ease-out), transform var(--dur-normal) var(--ease-out);
  display: flex;
  align-items: center;
}

.et-tool-card:hover .et-tool-card__arrow {
  color: var(--color-primary);
  transform: translateX(4px);
}

/* ----------------------------------------------------------------
   15. CATEGORY CARD
   ---------------------------------------------------------------- */
.et-category-card {
  display: flex;
  flex-direction: column;
  background: var(--gradient-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition:
    transform var(--dur-slow) var(--ease-out),
    box-shadow var(--dur-slow) var(--ease-out),
    border-color var(--dur-slow) var(--ease-out);
}

.et-category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-border);
  text-decoration: none;
}

.et-category-card__icon-wrap {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
  font-size: 28px;
  transition: transform var(--dur-slow) var(--ease-spring);
}

.et-category-card:hover .et-category-card__icon-wrap {
  transform: scale(1.08);
}

.et-category-card__title {
  font-size: var(--type-2xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
  line-height: 1.3;
}

.et-category-card__count {
  font-size: var(--type-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.et-category-card__desc {
  font-size: var(--type-base);
  color: var(--color-text-secondary);
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Category colour variants */
.et-category-card--calc .et-category-card__icon-wrap { background: var(--color-primary-surface); }
.et-category-card--conv .et-category-card__icon-wrap { background: var(--color-success-surface); }
.et-category-card--gen  .et-category-card__icon-wrap { background: var(--color-accent-surface); }
.et-category-card--dev  .et-category-card__icon-wrap { background: var(--color-warning-surface); }
.et-category-card--seo  .et-category-card__icon-wrap { background: var(--color-danger-surface); }
.et-category-card--fin  .et-category-card__icon-wrap { background: var(--color-success-border); }

[data-theme="dark"] .et-category-card--fin .et-category-card__icon-wrap {
  background: rgba(22,163,74,0.18);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .et-category-card--fin .et-category-card__icon-wrap {
    background: rgba(22,163,74,0.18);
  }
}

/* ----------------------------------------------------------------
   16. FEATURE CARD
   ---------------------------------------------------------------- */
.et-feature-card {
  background: var(--color-surface-1);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
}

.et-feature-card__icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-lg);
  background: var(--color-primary-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin-bottom: var(--space-5);
}

.et-feature-card__title {
  font-size: var(--type-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.et-feature-card__body {
  font-size: var(--type-base);
  color: var(--color-text-secondary);
  line-height: 1.65;
}

/* ----------------------------------------------------------------
   17. STATISTIC CARD
   ---------------------------------------------------------------- */
.et-stat-card {
  background: var(--color-surface-0);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  text-align: center;
}

.et-stat-card__number {
  font-family: var(--font-mono);
  font-size: var(--type-metric);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: var(--space-2);
}

.et-stat-card__label {
  font-size: var(--type-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  line-height: 1.4;
}

.et-stat-card__trend {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  margin-top: var(--space-3);
  font-size: var(--type-xs);
  font-weight: 600;
  color: var(--color-success-text);
  background: var(--color-success-surface);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-full);
}

/* ----------------------------------------------------------------
   18. BLOG CARD
   ---------------------------------------------------------------- */
.et-blog-card {
  display: flex;
  gap: var(--space-6);
  background: var(--color-surface-0);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition:
    transform var(--dur-slow) var(--ease-out),
    box-shadow var(--dur-slow) var(--ease-out);
}

.et-blog-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-hover);
  text-decoration: none;
}

.et-blog-card__thumb {
  width: 200px;
  flex-shrink: 0;
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  overflow: hidden;
  min-height: 130px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-subtle);
  font-size: var(--type-sm);
}

.et-blog-card__content {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.et-blog-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.et-blog-card__title {
  font-size: var(--type-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color var(--dur-normal) var(--ease-out);
}

.et-blog-card:hover .et-blog-card__title {
  color: var(--color-primary);
}

.et-blog-card__excerpt {
  font-size: var(--type-sm);
  color: var(--color-text-muted);
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.et-blog-card__date {
  font-size: var(--type-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-3);
}

@media (max-width: 575px) {
  .et-blog-card {
    flex-direction: column;
  }
  .et-blog-card__thumb {
    width: 100%;
    min-height: 160px;
  }
}

/* ----------------------------------------------------------------
   19. BREADCRUMB
   ---------------------------------------------------------------- */
.et-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  padding: 0;
  margin: 0 0 var(--space-8) 0;
  list-style: none;
}

.et-breadcrumb__item {
  display: flex;
  align-items: center;
}

.et-breadcrumb__link {
  font-size: var(--type-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out);
}

.et-breadcrumb__link:hover {
  color: var(--color-text-secondary);
}

.et-breadcrumb__sep {
  font-size: var(--type-sm);
  color: var(--color-text-subtle);
  margin: 0 var(--space-2);
}

.et-breadcrumb__current {
  font-size: var(--type-sm);
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* ----------------------------------------------------------------
   20. CALCULATOR FORM PANEL
   ---------------------------------------------------------------- */
.et-calculator {
  background: var(--color-surface-0);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-10);
  box-shadow: var(--shadow-panel);
  max-width: var(--width-calculator);
  margin: 0 auto;
}

.et-calculator__fields {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  margin-bottom: var(--space-6);
}

.et-calculator__row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-3);
  align-items: end;
}

@media (max-width: 575px) {
  .et-calculator {
    padding: var(--space-6);
  }
  .et-calculator__row {
    grid-template-columns: 1fr;
  }
}

/* ----------------------------------------------------------------
   21. RESULT CARD
   ---------------------------------------------------------------- */
.et-result-card {
  max-width: var(--width-calculator);
  margin: var(--space-6) auto 0;
  border-radius: var(--radius-lg);
  padding: var(--space-10);
  border: 1.5px solid var(--color-primary-border);
  background: var(--color-primary-surface);
  box-shadow: var(--shadow-md), var(--glow-accent);
  text-align: center;
  opacity: 0;
  transform: translateY(12px);
  transition:
    opacity var(--dur-enter) var(--ease-out),
    transform var(--dur-enter) var(--ease-out);
  display: none;
}

.et-result-card.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.et-result-card--success {
  border-color: var(--color-success-border);
  background: var(--color-success-surface);
  box-shadow: var(--shadow-md), var(--glow-success);
}

.et-result-card--warning {
  border-color: var(--color-warning-border);
  background: var(--color-warning-surface);
  box-shadow: var(--shadow-md), var(--glow-warning);
}

.et-result-card--danger {
  border-color: var(--color-danger-border);
  background: var(--color-danger-surface);
  box-shadow: var(--shadow-md), var(--glow-danger);
}

/* Static result card for tool page demo */
.et-result-card--static {
  display: block;
  opacity: 1;
  transform: none;
}

.et-result-card__label {
  font-size: var(--type-xs);
  font-weight: 600;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.et-result-card__value {
  font-family: var(--font-mono);
  font-size: var(--type-display);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: var(--space-4);
}

.et-result-card__badge-wrap {
  margin-bottom: var(--space-4);
}

.et-result-card__interpret {
  font-size: var(--type-base);
  color: var(--color-text-secondary);
  max-width: 40ch;
  margin: 0 auto var(--space-3);
  line-height: 1.6;
}

.et-result-card__echo {
  font-size: var(--type-xs);
  color: var(--color-text-muted);
}

/* ----------------------------------------------------------------
   22. FORMULA BLOCK
   ---------------------------------------------------------------- */
.et-formula {
  background: var(--color-formula-bg);
  border: 1px solid var(--color-border-subtle);
  border-left: 4px solid var(--color-primary-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6) var(--space-8);
  margin: var(--space-6) 0;
  font-family: var(--font-mono);
  font-size: var(--type-base);
  color: var(--color-formula-text);
  line-height: 1.7;
  overflow-x: auto;
}

.et-formula__title {
  font-family: var(--font-sans);
  font-size: var(--type-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

/* ----------------------------------------------------------------
   23. INFO CARD
   ---------------------------------------------------------------- */
.et-info-card {
  background: var(--color-surface-1);
  border: 1px solid var(--color-border-subtle);
  border-left: 4px solid var(--color-primary-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.et-info-card__title {
  font-size: var(--type-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.et-info-card__body {
  font-size: var(--type-sm);
  color: var(--color-text-secondary);
  line-height: 1.65;
}

/* ----------------------------------------------------------------
   24. FAQ ACCORDION
   ---------------------------------------------------------------- */
.et-faq {
  background: var(--color-surface-0);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.et-faq__item {
  border-bottom: 1px solid var(--color-border-subtle);
}

.et-faq__item:last-child {
  border-bottom: none;
}

.et-faq__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  width: 100%;
  padding: var(--space-5) var(--space-6);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  transition: background-color var(--dur-fast) var(--ease-out);
}

.et-faq__question:hover {
  background-color: var(--color-surface-overlay);
}

.et-faq__question:focus-visible {
  outline: none;
  box-shadow: inset var(--shadow-focus);
}

.et-faq__q-text {
  font-size: var(--type-base);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.45;
}

.et-faq__icon {
  color: var(--color-text-muted);
  flex-shrink: 0;
  transition: transform var(--dur-slow) var(--ease-in-out), color var(--dur-normal) var(--ease-out);
}

.et-faq__item.is-open .et-faq__icon {
  transform: rotate(180deg);
  color: var(--color-primary);
}

.et-faq__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--dur-slow) var(--ease-in-out), padding var(--dur-slow) var(--ease-in-out);
}

.et-faq__item.is-open .et-faq__answer {
  max-height: 400px;
}

.et-faq__a-text {
  padding: 0 var(--space-6) var(--space-5);
  font-size: var(--type-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ----------------------------------------------------------------
   25. AD SLOT
   ---------------------------------------------------------------- */
.et-ad-slot {
  position: relative;
  background: var(--color-ad-bg);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.et-ad-slot__label {
  position: absolute;
  top: var(--space-2);
  right: var(--space-3);
  font-size: var(--type-2xs);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ad-label);
}

.et-ad-slot__placeholder {
  font-size: var(--type-xs);
  color: var(--color-text-subtle);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

/* Standard IAB sizes */
.et-ad-slot--leaderboard {
  width: 728px;
  height: 90px;
  max-width: 100%;
}

.et-ad-slot--rectangle {
  width: 336px;
  height: 280px;
  max-width: 100%;
}

.et-ad-slot--mobile {
  width: 320px;
  height: 50px;
  max-width: 100%;
}

/* ----------------------------------------------------------------
   26. CTA SECTION
   ---------------------------------------------------------------- */
.et-cta {
  background: var(--gradient-cta);
  padding: var(--space-24) 0;
  text-align: center;
}

.et-cta__eyebrow {
  color: rgba(255,255,255,0.70);
  margin-bottom: var(--space-4);
}

.et-cta__title {
  font-size: clamp(1.875rem, 4vw, var(--type-4xl));
  font-weight: 700;
  color: var(--color-text-inverse);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
}

.et-cta__subtitle {
  font-size: var(--type-lg);
  color: rgba(255,255,255,0.75);
  max-width: 48ch;
  margin: 0 auto var(--space-8);
  line-height: 1.6;
}

.et-cta__actions {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.et-btn--cta-primary {
  background: var(--color-text-inverse);
  color: var(--color-primary);
  box-shadow: var(--shadow-md), var(--glow-primary);
}

.et-btn--cta-primary:hover {
  background: var(--color-text-inverse);
  color: var(--color-primary-dark);
  filter: brightness(0.96);
}

.et-btn--cta-ghost {
  background: rgba(255,255,255,0.12);
  color: var(--color-text-inverse);
  border: 1.5px solid rgba(255,255,255,0.25);
}

.et-btn--cta-ghost:hover {
  background: rgba(255,255,255,0.20);
  color: var(--color-text-inverse);
}

/* ----------------------------------------------------------------
   27. FOOTER
   ---------------------------------------------------------------- */
.et-footer {
  background: var(--color-surface-1);
  border-top: 1px solid var(--color-border-subtle);
  padding: var(--space-20) 0 0;
}

.et-footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.et-footer__brand {
  font-size: var(--type-xl);
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--color-text);
  margin-bottom: var(--space-3);
  display: block;
  text-decoration: none;
}

.et-footer__tagline {
  font-size: var(--type-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  max-width: 30ch;
  margin-bottom: var(--space-5);
}

.et-footer__col-title {
  font-size: var(--type-sm);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  letter-spacing: -0.01em;
}

.et-footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  list-style: none;
  margin: 0;
  padding: 0;
}

.et-footer__link {
  font-size: var(--type-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out);
}

.et-footer__link:hover {
  color: var(--color-text-secondary);
}

.et-footer__bottom {
  border-top: 1px solid var(--color-border-subtle);
  padding: var(--space-5) 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.et-footer__copyright {
  font-size: var(--type-xs);
  color: var(--color-text-muted);
}

.et-footer__bottom-links {
  display: flex;
  gap: var(--space-5);
}

.et-footer__bottom-link {
  font-size: var(--type-xs);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out);
}

.et-footer__bottom-link:hover {
  color: var(--color-text-secondary);
}

/* Footer accordion — desktop: hide trigger, show static title */
.et-footer__section-btn {
  display: none;
}

.et-footer__chevron {
  transition: transform var(--dur-normal) var(--ease-out);
}

@media (max-width: 991px) {
  .et-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }
}

/* Footer accordion — mobile only */
@media (max-width: 767px) {
  .et-footer {
    padding-top: var(--space-6);
  }

  .et-footer__grid {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .et-footer__brand-col {
    padding: var(--space-5) 0;
    border-bottom: 1px solid var(--color-border-subtle);
    margin-bottom: var(--space-2);
  }

  .et-footer__section {
    border-bottom: 1px solid var(--color-border-subtle);
  }

  .et-footer__section-btn {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: var(--space-4) 0;
    background: none;
    border: none;
    font-size: var(--type-sm);
    font-weight: 700;
    color: var(--color-text);
    cursor: pointer;
    letter-spacing: -0.01em;
    min-height: 52px;
  }

  .et-footer__section-btn[aria-expanded="true"] .et-footer__chevron {
    transform: rotate(180deg);
  }

  .et-footer__col-title {
    display: none;
  }

  .et-footer__section-body {
    overflow: hidden;
    max-height: 0;
    transition:
      max-height var(--dur-slow) var(--ease-out),
      padding-bottom var(--dur-slow) var(--ease-out);
    padding-bottom: 0;
  }

  .et-footer__section-body.is-open {
    max-height: 600px;
    padding-bottom: var(--space-4);
  }

  .et-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ----------------------------------------------------------------
   28. SKELETON LOADING
   ---------------------------------------------------------------- */
@keyframes et-shimmer {
  from { background-position: 200% center; }
  to   { background-position: -200% center; }
}

.et-skeleton {
  background: linear-gradient(
    90deg,
    var(--color-skeleton-base) 25%,
    var(--color-skeleton-shine) 50%,
    var(--color-skeleton-base) 75%
  );
  background-size: 200% 100%;
  animation: et-shimmer var(--dur-loading) linear infinite;
  border-radius: var(--radius-md);
}

.et-skeleton--text {
  height: 1em;
  border-radius: var(--radius-xs);
}

.et-skeleton--card {
  height: 200px;
  border-radius: var(--radius-xl);
}

.et-skeleton--circle {
  border-radius: var(--radius-full);
}

/* ----------------------------------------------------------------
   29. EMPTY & ERROR STATES
   ---------------------------------------------------------------- */
.et-empty-state {
  text-align: center;
  padding: var(--space-20) var(--space-8);
}

.et-empty-state__icon {
  font-size: 48px;
  margin-bottom: var(--space-5);
  color: var(--color-text-subtle);
  display: block;
}

.et-empty-state__title {
  font-size: var(--type-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.et-empty-state__body {
  font-size: var(--type-base);
  color: var(--color-text-muted);
  max-width: 42ch;
  margin: 0 auto var(--space-6);
  line-height: 1.65;
}

.et-error-state {
  text-align: center;
  padding: var(--space-20) var(--space-8);
}

/* ----------------------------------------------------------------
   30. TOOL PAGE LAYOUT
   ---------------------------------------------------------------- */
.et-tool-page {
  max-width: var(--container-tool);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.et-tool-header {
  padding: var(--space-12) 0 var(--space-10);
}

.et-tool-header__eyebrow {
  margin-bottom: var(--space-4);
}

.et-tool-header__title {
  margin-bottom: var(--space-4);
}

.et-tool-header__lead {
  font-size: var(--type-lg);
  color: var(--color-text-secondary);
  max-width: 56ch;
  line-height: 1.65;
}

.et-content-section {
  padding: var(--space-16) 0;
  max-width: 65ch;
}

.et-content-section h2 {
  margin-bottom: var(--space-4);
}

/* Push sub-section h2 headings away from the preceding content */
.et-content-section * + h2 {
  margin-top: var(--space-12);
}

.et-content-section h3 {
  font-size: var(--type-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
}

.et-content-section h2 + h3 {
  margin-top: var(--space-3);
}

.et-content-section p {
  font-size: var(--type-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-4);
}

.et-content-section ul,
.et-content-section ol {
  padding-left: var(--space-6);
  margin-bottom: var(--space-5);
}

.et-content-section li {
  font-size: var(--type-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-2);
}

.et-content-section li:last-child {
  margin-bottom: 0;
}

.et-content-section strong {
  color: var(--color-text);
}

/* BMI weight categories table (used in long_description content) */
.et-bmi-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--type-sm);
  margin: var(--space-5) 0 var(--space-6);
  overflow-x: auto;
  display: block;
}

.et-bmi-table th {
  font-size: var(--type-xs);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding: var(--space-3) var(--space-4);
  border-bottom: 2px solid var(--color-border-subtle);
  text-align: left;
  white-space: nowrap;
}

.et-bmi-table td {
  padding: var(--space-3) var(--space-4);
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border-subtle);
  vertical-align: top;
}

.et-bmi-table tr:last-child td {
  border-bottom: none;
}

.et-bmi-table tr:hover td {
  background: var(--color-surface-overlay);
}

/* Examples table */
.et-examples-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--type-sm);
  margin-top: var(--space-5);
}

.et-examples-table th {
  font-size: var(--type-xs);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding: var(--space-3) var(--space-4);
  border-bottom: 2px solid var(--color-border-subtle);
  text-align: left;
}

.et-examples-table td {
  padding: var(--space-4);
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border-subtle);
}

.et-examples-table tr:last-child td { border-bottom: none; }

.et-examples-table tr:hover td {
  background: var(--color-surface-overlay);
}

/* ----------------------------------------------------------------
   31. SEARCH PAGE
   ---------------------------------------------------------------- */
.et-search-hero {
  background: var(--gradient-hero);
  padding: var(--space-16) 0 var(--space-12);
  text-align: center;
}

.et-search-hero__title {
  font-size: var(--type-5xl);
  margin-bottom: var(--space-6);
}

.et-search-results__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
  gap: var(--space-3);
}

.et-search-results__count {
  font-size: var(--type-sm);
  color: var(--color-text-muted);
}

/* ----------------------------------------------------------------
   32. BLOG PAGE
   ---------------------------------------------------------------- */
.et-blog-hero {
  background: var(--gradient-hero);
  padding: var(--space-16) 0 var(--space-12);
}

.et-blog-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.et-blog-sidebar__title {
  font-size: var(--type-base);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.et-blog-sidebar__item {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border-subtle);
  text-decoration: none;
  transition: opacity var(--dur-fast) var(--ease-out);
}

.et-blog-sidebar__item:hover { opacity: 0.8; }

.et-blog-sidebar__item-title {
  font-size: var(--type-sm);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.et-blog-sidebar__item-meta {
  font-size: var(--type-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

/* ----------------------------------------------------------------
   33. ERROR PAGES  (403, 404, 500, 503)
   ---------------------------------------------------------------- */
.et-error-page {
  min-height: calc(100vh - 64px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-20) var(--space-6);
}

.et-error-page__code {
  font-family: var(--font-mono);
  font-size: clamp(5rem, 15vw, 10rem);
  font-weight: 700;
  color: var(--color-border-subtle);
  line-height: 1;
  margin-bottom: var(--space-6);
  letter-spacing: -0.05em;
}

.et-error-page__title {
  margin-bottom: var(--space-4);
}

.et-error-page__body {
  font-size: var(--type-lg);
  color: var(--color-text-muted);
  max-width: 40ch;
  margin: 0 auto var(--space-8);
  line-height: 1.65;
}

.et-error-page__actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: var(--space-12);
}

.et-error-page__suggestions-title {
  font-size: var(--type-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  text-align: center;
}

.et-error-page__search-section {
  max-width: 520px;
  width: 100%;
  margin: 0 auto var(--space-12);
}

.et-error-page__search-label {
  font-size: var(--type-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
  text-align: center;
}

.et-error-page__chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
  margin-bottom: var(--space-10);
}

.et-error-page__divider {
  width: 100%;
  max-width: 480px;
  height: 1px;
  background: var(--color-border-subtle);
  margin-bottom: var(--space-8);
}

.et-error-page__cats-label {
  font-size: var(--type-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: var(--space-5);
  text-align: center;
}

.et-error-page__cats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  max-width: 820px;
  width: 100%;
  margin-bottom: var(--space-10);
}

@media (max-width: 767px) {
  .et-error-page__cats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .et-error-page__actions {
    flex-direction: column;
    align-items: center;
  }
  .et-error-page__actions .et-btn {
    width: 100%;
    max-width: 300px;
    justify-content: center;
  }
}

/* ----------------------------------------------------------------
   34. DARK MODE TOGGLE
   ---------------------------------------------------------------- */
.et-theme-toggle {
  display: inline-flex;
  align-items: center;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}

.et-theme-toggle__track {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  background: var(--color-warning-surface);
  border: 1.5px solid var(--color-warning-border);
  border-radius: var(--radius-full);
  padding: 0 var(--space-2);
  height: 36px;
  min-width: 68px;
  transition:
    background var(--dur-normal) var(--ease-out),
    border-color var(--dur-normal) var(--ease-out);
}

.et-theme-toggle__icon {
  font-size: var(--type-base);
  color: var(--color-warning);
  flex-shrink: 0;
  transition: color var(--dur-normal) var(--ease-out);
}

.et-theme-toggle__thumb {
  width: 24px;
  height: 24px;
  border-radius: var(--radius-full);
  background: var(--color-warning);
  flex-shrink: 0;
  transition: background var(--dur-normal) var(--ease-out);
}

.et-theme-toggle:hover .et-theme-toggle__track {
  border-color: var(--color-warning);
}

[data-theme="dark"] .et-theme-toggle__track {
  background: var(--color-surface-2);
  border-color: var(--color-border);
}

[data-theme="dark"] .et-theme-toggle__icon {
  color: var(--color-text-secondary);
}

[data-theme="dark"] .et-theme-toggle__thumb {
  background: var(--color-surface-3);
}

[data-theme="dark"] .et-theme-toggle:hover .et-theme-toggle__track {
  border-color: var(--color-border-strong);
}

/* ----------------------------------------------------------------
   35. KEYFRAME ANIMATIONS
   ---------------------------------------------------------------- */
@keyframes et-spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

@keyframes et-fade-in-up {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes et-fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.et-animate-in {
  animation: et-fade-in-up var(--dur-enter) var(--ease-out) both;
}

/* ----------------------------------------------------------------
   36. RESPONSIVE
   ---------------------------------------------------------------- */
@media (max-width: 991px) {
  .et-hero { padding: var(--space-16) 0 var(--space-12); }
  .et-section { padding: var(--space-12) 0; }
  .et-cta { padding: var(--space-16) 0; }
}

@media (max-width: 767px) {
  .et-hero__headline { letter-spacing: -0.025em; }
  .et-hero { padding: var(--space-12) 0 var(--space-10); }
  .et-tool-header { padding: var(--space-8) 0 var(--space-6); }
  .et-calculator { padding: var(--space-6); }
  .et-result-card { padding: var(--space-6); }
  .et-ad-slot--leaderboard {
    width: 320px;
    height: 50px;
  }
}

/* ----------------------------------------------------------------
   37. REDUCED MOTION
   ---------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ----------------------------------------------------------------
   38. UTILITIES
   ---------------------------------------------------------------- */
.et-container {
  max-width: var(--container-base);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.et-container--tool {
  max-width: var(--container-tool);
}

.et-container--content {
  max-width: var(--container-content);
}

.et-divider {
  border: none;
  border-top: 1px solid var(--color-border-subtle);
  margin: var(--space-8) 0;
}

.et-ad-separator {
  margin: var(--space-20) 0;
  display: flex;
  justify-content: center;
}

/* ----------------------------------------------------------------
   39. HOMEPAGE — SPRINT 3.1 CLASSES
   ---------------------------------------------------------------- */

/* Stats band — replaces inline background/border on stats section */
.et-stats-band {
  background: var(--color-surface-0);
  border-bottom: 1px solid var(--color-border-subtle);
  padding: var(--space-10) 0;
}

/* Section header split layout — flex row with action button on the right */
.et-section__header--split {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

/* Feature card icon colour modifiers */
.et-feature-card__icon--success {
  background: var(--color-success-surface);
  color: var(--color-success);
}

.et-feature-card__icon--accent {
  background: var(--color-accent-surface);
  color: var(--color-accent);
}

.et-feature-card__icon--warning {
  background: var(--color-warning-surface);
  color: var(--color-warning);
}

.et-feature-card__icon--info {
  background: var(--color-info-surface);
  color: var(--color-info);
}

.et-feature-card__icon--danger {
  background: var(--color-danger-surface);
  color: var(--color-danger);
}

/* Tool card — horizontal variant (trending tools) */
.et-tool-card--horizontal {
  flex-direction: row;
  align-items: flex-start;
  gap: var(--space-5);
}

.et-tool-card--horizontal .et-tool-card__icon-badge {
  margin-bottom: 0;
  flex-shrink: 0;
}

.et-tool-card--horizontal .et-tool-card__body {
  flex: 1;
  min-width: 0;
}

.et-tool-card--horizontal .et-tool-card__title {
  font-size: var(--type-lg);
}

.et-tool-card__body {
  display: flex;
  flex-direction: column;
}

/* Stat card — text variant for non-numeric stats like "Zero" / "Always" */
.et-stat-card__number--text {
  font-family: var(--font-display);
  font-size: var(--type-2xl);
  font-weight: 800;
  letter-spacing: -0.02em;
}

/* Colour utility classes for eyebrow icons */
.et-text-warning { color: var(--color-warning) !important; }
.et-text-success { color: var(--color-success) !important; }
.et-text-info    { color: var(--color-info)    !important; }
.et-text-accent  { color: var(--color-accent)  !important; }
.et-text-danger  { color: var(--color-danger)  !important; }

/* Centered eyebrow — used in CTA section */
.et-eyebrow--center {
  display: flex;
  justify-content: center;
  margin-bottom: var(--space-4);
}

/* ----------------------------------------------------------------
   40. SHARED COMPONENT FREEZE — SPRINT 3.1.5 CLASSES
   ---------------------------------------------------------------- */

/* Navbar hamburger icon size */
.et-navbar__toggle i {
  font-size: 22px;
}

/* Footer social links row */
.et-footer__social {
  display: flex;
  gap: var(--space-3);
}

/* Footer social icon buttons */
.et-footer__social-btn {
  width: 36px;
  height: 36px;
  padding: 0;
  border: 1.5px solid var(--color-border-subtle);
}

/* Ad slot placeholder icons */
.et-ad-slot__placeholder i {
  font-size: 24px;
}

/* ----------------------------------------------------------------
   41. UNIVERSAL TOOL PLATFORM — SPRINT 3.2B
   ---------------------------------------------------------------- */

/* ---- Tool Hero (Section 2) ---- */
.et-tool-hero {
  padding: var(--space-12) 0 var(--space-10);
}

.et-tool-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.et-tool-hero__title {
  margin-bottom: var(--space-4);
}

.et-tool-hero__lead {
  font-size: var(--type-lg);
  color: var(--color-text-secondary);
  max-width: 56ch;
  line-height: 1.65;
  margin-bottom: 0;
}

/* ---- Calculator header row (title + unit toggle) ---- */
.et-calculator__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-6);
}

.et-calculator__title {
  font-size: var(--type-lg);
  font-weight: 600;
  margin: 0;
}

/* ---- Unit badge (kg / cm label beside input) ---- */
.et-calculator__unit-badge {
  height: 56px;
  display: flex;
  align-items: center;
  font-size: var(--type-base);
  padding: 0 var(--space-4);
  white-space: nowrap;
}

/* ---- EMI Calculator — Results Breakdown ---- */
.et-emi-breakdown {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-6);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity var(--dur-normal) var(--ease-out),
              transform var(--dur-normal) var(--ease-out);
}

.et-emi-breakdown.is-visible {
  opacity: 1;
  transform: none;
}

.et-emi-breakdown__card {
  background: var(--color-surface-1);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-4);
  text-align: center;
  min-width: 0;       /* prevent grid blowout when content is wider than 1fr */
  overflow: hidden;
}

.et-emi-breakdown__card--primary {
  border-color: var(--color-primary);
  background: var(--color-primary-surface);
}

.et-emi-breakdown__label {
  font-size: var(--type-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin: 0 0 var(--space-3);
}

.et-emi-breakdown__card--primary .et-emi-breakdown__label {
  color: var(--color-primary);
}

.et-emi-breakdown__value {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 2px;
  line-height: 1;
  overflow: hidden;
}

.et-emi-breakdown__currency {
  font-size: var(--type-base);
  font-weight: 600;
  color: var(--color-text-muted);
}

.et-emi-breakdown__card--primary .et-emi-breakdown__currency {
  color: var(--color-primary);
}

.et-emi-breakdown__amount {
  font-size: clamp(var(--type-sm), 2.8vw, var(--type-2xl));
  font-weight: 700;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 100%;
}

.et-emi-breakdown__card--primary .et-emi-breakdown__amount {
  color: var(--color-primary);
}

@media (max-width: 575px) {
  .et-emi-breakdown {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }

  .et-emi-breakdown__amount {
    font-size: clamp(var(--type-base), 6vw, var(--type-xl));
    white-space: nowrap;
  }
}

/* ---- CI Growth Chart ---- */
.et-ci-chart-wrap {
  margin-top: var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--color-surface-1);
  border: 1px solid var(--color-border-subtle);
  padding: var(--space-3) var(--space-2) var(--space-1);
  overflow: hidden;
}

.et-ci-chart-wrap canvas {
  display: block;
  width: 100%;
  height: auto;
}

/* ---- Imperial height two-column grid ---- */
.et-calculator__imperial-height {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

/* ---- Trust Signals (Section 8) ---- */
.et-trust-signals {
  background: var(--color-surface-1);
  border: 1px solid var(--color-border-subtle);
  border-left: 4px solid var(--color-success-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin: var(--space-8) 0;
}

.et-trust-signals__title {
  font-size: var(--type-sm);
  font-weight: 600;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.et-trust-signals__body {
  font-size: var(--type-sm);
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin: 0;
}

/* ---- Section headings inside et-tool-page ---- */
.et-tool-section-heading {
  font-size: var(--type-2xl);
  font-weight: 700;
  margin-bottom: var(--space-6);
}

/* ---- FAQ section wrapper ---- */
.et-faq-section {
  padding: var(--space-16) 0;
  max-width: 65ch;
}

/* ---- Related tools section wrapper ---- */
.et-related-section {
  padding-bottom: var(--space-20);
}

/* ---- Error text message span ---- */
.et-error-text__msg {
  /* inline — sits after the icon in et-error-text */
}

/* ---- info-card coming-soon modifier ---- */
.et-info-card--coming-soon {
  margin-bottom: var(--space-8);
}