@font-face {
  font-family: "Roboto Slab";
  src: url("../assets/fonts/RobotoSlab.ttf") format("truetype");
  font-weight: 100 900;
  font-display: swap;
}

:root {
  --font-body: "Roboto Slab", serif;

  --color-bg: #f4f4fb;
  --color-bg-alt: #f8f8ff;
  --color-surface: #ffffff;
  --color-surface-soft: #f2f2fb;
  --color-surface-muted: #e6e7f5;

  --color-primary: #3730a3;
  --color-primary-hover: #312e81;
  --color-primary-mid: #4f46e5;
  --color-primary-soft: #e9e7ff;

  --color-text-strong: #16142b;
  --color-text: #2d2b43;
  --color-text-muted: #4f4b63;
  --color-text-soft: #726f8a;
  --color-text-inverse: #ffffff;

  --color-border: #dbd9ed;
  --color-border-strong: #c4c1df;
  --color-divider: #e9e8f4;

  --container: 1120px;
  --page-gutter: 28px;

  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 32px;
  --space-8: 40px;
  --space-9: 48px;
  --space-10: 64px;
  --space-12: 96px;
  --space-13: 120px;
  --space-14: 144px;

  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --radius-xl: 28px;
  --radius-pill: 999px;

  --shadow-sm: 0 8px 24px rgba(22, 20, 43, 0.06);
  --shadow-md: 0 18px 50px rgba(22, 20, 43, 0.08);
  --shadow-lg: 0 30px 90px rgba(22, 20, 43, 0.11);

  --header-height: 76px;

  --accent-logos: var(--color-primary);
  --accent-colors: #7c3aed;
  --accent-typography: #6366f1;
  --accent-templates: #3730a3;
  --accent-guidelines: #475569;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--page-gutter);
}

h1, h2, h3, h4 {
  color: var(--color-text-strong);
  font-weight: 700;
  line-height: 1.12;
  margin: 0 0 var(--space-4);
}

h1 { font-size: 48px; letter-spacing: -0.01em; }
.hero h1 { font-size: clamp(32px, 6.5vw, 58px); }
h2 { font-size: 32px; }
h3 { font-size: 22px; }
h4 { font-size: 17px; }

p { margin: 0 0 var(--space-4); color: var(--color-text-muted); }

a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-hover); }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--color-surface-alpha, rgba(255,255,255,0.92));
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-divider);
}

.site-header .container {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.brand-mark {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 700;
  color: var(--color-text-strong);
}
.brand-mark img { height: 28px; width: auto; display: block; }

.site-nav {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--color-text-muted);
  font-weight: 600;
  font-size: 14px;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-pill);
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  background: var(--color-surface-muted);
  color: var(--color-primary);
}

/* Hero */
.hero-band {
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

.hero-band::before,
.hero-band::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(10px);
  z-index: -1;
}

.hero-band::before {
  width: 560px;
  height: 560px;
  top: -260px;
  left: 50%;
  transform: translateX(-62%);
  background: radial-gradient(circle, rgba(79, 70, 229, 0.16) 0%, rgba(79, 70, 229, 0) 70%);
}

.hero-band::after {
  width: 420px;
  height: 420px;
  top: -120px;
  left: 50%;
  transform: translateX(20%);
  background: radial-gradient(circle, rgba(124, 58, 237, 0.12) 0%, rgba(124, 58, 237, 0) 70%);
}

.hero {
  padding: var(--space-13) 0 var(--space-10);
  text-align: center;
  position: relative;
}

.hero-mark {
  width: 76px;
  height: 76px;
  margin: 0 auto var(--space-6);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
}
.hero-mark img { width: 40px; height: 40px; }

.eyebrow {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: var(--space-5);
}

.hero p.lead {
  font-size: 20px;
  line-height: 1.45;
  max-width: 640px;
  margin: 0 auto var(--space-7);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  height: 48px;
  padding: 0 24px;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 14px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 160ms ease, color 160ms ease, border-color 160ms ease;
}

.btn-primary { background: var(--color-primary); color: var(--color-text-inverse); }
.btn-primary:hover { background: var(--color-primary-hover); color: var(--color-text-inverse); }

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-primary);
  border-color: var(--color-border);
}
.btn-secondary:hover { background: var(--color-bg-alt); }

/* Sections */
.section { padding: var(--space-12) 0; }
.section-alt { background: var(--color-bg-alt); }

.section-head {
  margin-bottom: var(--space-8);
}
.section-head p { max-width: 640px; }

.quick-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-9);
}

.quick-link-card {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  padding-top: calc(var(--space-6) + 4px);
  text-align: left;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: transform 160ms ease, box-shadow 160ms ease;
}
.quick-link-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--accent, var(--color-primary));
}
.quick-link-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.quick-link-card .icon-wrap {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--accent, var(--color-primary)) 12%, white);
  color: var(--accent, var(--color-primary));
  margin-bottom: var(--space-4);
}
.quick-link-card .icon-wrap svg { width: 22px; height: 22px; }
.quick-link-card h3 { margin-bottom: var(--space-2); }
.quick-link-card p { margin: 0; font-size: 14px; }

/* Cards grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-5);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform 160ms ease, box-shadow 160ms ease;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }

.card-media {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 160px;
  padding: var(--space-5);
  background: var(--color-surface-soft);
}
.card-media.on-dark { background: var(--color-text-strong); }
.card-media img, .card-media svg { max-width: 100%; max-height: 100%; }

.card-body { padding: var(--space-5); }
.card-body h4 { margin-bottom: var(--space-2); }
.card-meta { font-size: 13px; color: var(--color-text-soft); margin-bottom: var(--space-4); }

.card-actions { display: flex; gap: var(--space-2); flex-wrap: wrap; }

.chip {
  display: inline-flex;
  align-items: center;
  height: 32px;
  padding: 0 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}
.chip:hover { background: var(--color-surface-muted); }

/* Group headers on logos/templates pages */
.group-head { margin: var(--space-9) 0 var(--space-5); }
.group-head:first-child { margin-top: 0; }
.group-head h3 { margin-bottom: var(--space-2); }
.group-head p { margin: 0; font-size: 14px; }

/* Color swatches */
.swatch-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-4);
}

.swatch {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface);
  cursor: pointer;
  text-align: left;
  padding: 0;
  font-family: inherit;
  box-shadow: var(--shadow-sm);
  transition: transform 160ms ease, box-shadow 160ms ease;
}
.swatch:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }

.swatch-color { height: 84px; }

.swatch-info { padding: var(--space-4); }
.swatch-info .name { font-weight: 700; font-size: 14px; color: var(--color-text-strong); display: block; margin-bottom: 4px; }
.swatch-info .hex { font-size: 13px; color: var(--color-text-soft); font-family: ui-monospace, "SF Mono", Menlo, monospace; }
.swatch-info .copied { color: var(--color-primary); }

/* Typography specimens */
.type-row {
  display: flex;
  align-items: baseline;
  gap: var(--space-6);
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--color-divider);
}
.type-row:last-child { border-bottom: none; }
.type-row .type-meta {
  flex: 0 0 180px;
  font-size: 13px;
  color: var(--color-text-soft);
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
}
.type-row .type-sample { color: var(--color-text-strong); font-weight: 700; overflow-wrap: anywhere; }

/* Guidelines */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
}
@media (max-width: 720px) { .two-col { grid-template-columns: 1fr; } }

.rule-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.rule-list li {
  padding-left: 28px;
  position: relative;
  color: var(--color-text);
}
.rule-list.do li::before { content: "✓"; position: absolute; left: 0; color: var(--color-primary); font-weight: 700; }
.rule-list.dont li::before { content: "✕"; position: absolute; left: 0; color: #b42318; font-weight: 700; }

.panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-7);
  box-shadow: var(--shadow-sm);
}

.dark-panel {
  background: var(--color-text-strong);
  color: var(--color-text-inverse);
  border-radius: var(--radius-lg);
  padding: var(--space-9);
}
.dark-panel h2 { color: var(--color-text-inverse); }
.dark-panel p { color: rgba(255,255,255,0.78); }

table.rules-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
table.rules-table th, table.rules-table td {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-divider);
}
table.rules-table th { color: var(--color-text-soft); font-weight: 700; font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; }

.badge-note {
  display: inline-block;
  font-size: 13px;
  color: var(--color-text-soft);
  background: var(--color-surface-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-4);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-divider);
  padding: var(--space-8) 0;
  background: var(--color-bg-alt);
}
.site-footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
}
.site-footer p { margin: 0; font-size: 13px; color: var(--color-text-soft); }

@media (max-width: 640px) {
  .hero { padding: var(--space-9) 0 var(--space-7); }
  h1 { font-size: 34px; }
  .site-nav { display: none; }
}