/* ==========================================================================
   Public Pages
   Shared styling for landing, privacy, imprint, and about pages.
   ========================================================================== */

:root {
  --page-bg: #f8fafc;
  --panel-bg: #ffffff;
  --panel-soft: #f1f5f9;
  --text: #334155;
  --heading: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --accent: #418af5;
  --accent-strong: #0f172a;
  --accent-soft: rgba(65, 138, 245, 0.07);
  --success-soft: rgba(20, 184, 166, 0.12);
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.05), 0 10px 28px rgba(15, 23, 42, 0.06);
  --radius: 8px;
  --maxw: 1060px;
  color-scheme: light;
}

:root.dark-mode,
.dark-mode {
  --page-bg: #0d1117;
  --panel-bg: #14171a;
  --panel-soft: #1f2328;
  --text: #e6edf3;
  --heading: #f8fafc;
  --muted: #8b949e;
  --border: #2b3036;
  --accent: #bb86fc;
  --accent-strong: #f8fafc;
  --accent-soft: rgba(187, 134, 252, 0.07);
  --success-soft: rgba(45, 212, 191, 0.12);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.18), 0 14px 38px rgba(0, 0, 0, 0.34);
  color-scheme: dark;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  font: 16px/1.6 Inter, Roboto, system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
  background:
    linear-gradient(color-mix(in srgb, var(--border) 62%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--border) 62%, transparent) 1px, transparent 1px),
    var(--page-bg);
  background-size: 56px 56px;
  color: var(--text);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(circle at 50% 0%, color-mix(in srgb, var(--accent-soft) 60%, transparent), transparent 38rem),
    linear-gradient(180deg, color-mix(in srgb, var(--page-bg) 92%, transparent), var(--page-bg) 46vh);
}

.landing-page {
  background: var(--page-bg);
}

.constellation-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.82;
}

.site-nav,
.landing-shell,
.page-shell,
.footer {
  position: relative;
  z-index: 1;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  color: var(--accent);
}

.site-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 56px;
  padding: 0 24px;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel-bg) 90%, transparent);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--heading);
  font-weight: 500;
}

.brand img {
  width: 34px;
  height: auto;
  object-fit: contain;
  border-radius: 6px;
  filter: invert(1);
}

.dark-mode .brand img {
  filter: invert(0);
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 18px;
  color: var(--muted);
  font-size: 0.92rem;
}

.nav-links a {
  white-space: nowrap;
}

.nav-cta,
.button-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 15px;
  border: 1px solid var(--accent-strong);
  border-radius: 7px;
  background: var(--accent-strong);
  color: var(--page-bg);
  box-shadow: 0 6px 14px rgba(15, 23, 42, 0.12);
  font-weight: 700;
  line-height: 1;
}

.dark-mode .nav-cta,
.dark-mode .button-primary {
  color: #0d1117;
}

.nav-cta:hover,
.button-primary:hover {
  color: var(--page-bg);
  transform: translateY(-1px);
}

.dark-mode .nav-cta:hover,
.dark-mode .button-primary:hover {
  color: #0d1117;
}

.button-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 15px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: color-mix(in srgb, var(--panel-bg) 70%, transparent);
  color: var(--heading);
  font-weight: 700;
  line-height: 1;
}

.page-shell,
.landing-shell {
  width: min(var(--maxw), calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  min-height: 86svh;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  align-items: center;
  gap: clamp(28px, 5vw, 72px);
  padding: clamp(42px, 7vw, 76px) 0 38px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  padding: 0 0 7px;
  border: none;
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 48%, transparent);
  border-radius: 0;
  background: transparent;
  color: var(--accent);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  line-height: 1;
  text-transform: uppercase;
}

.hero h1,
.page-header h1 {
  margin: 0;
  color: var(--heading);
  font-size: clamp(2.45rem, 6.4vw, 4.9rem);
  font-weight: 800;
  letter-spacing: 0;
  line-height: 0.94;
}

.page-header h1 {
  font-size: clamp(2rem, 4.4vw, 3.5rem);
}

.landing-title {
  max-width: 720px;
  font-size: 3.85rem;
  font-weight: 600;
  line-height: 1.05;
}

.lead {
  max-width: 680px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.7vw, 1.16rem);
  line-height: 1.55;
}

.trust-line {
  margin-top: 18px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--panel-bg) 86%, var(--panel-soft));
  color: var(--heading);
  font-size: 0.93rem;
  line-height: 1.5;
}

.hero-actions,
.links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.hero-visual {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: color-mix(in srgb, var(--panel-bg) 96%, transparent);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.visual-topbar {
  display: flex;
  align-items: center;
  gap: 7px;
  min-height: 38px;
  padding: 0 14px;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel-soft) 72%, transparent);
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--muted);
  opacity: 0.55;
}

.visual-grid {
  display: grid;
  gap: 10px;
  padding: 14px;
}

.ai-row,
.consensus-preview,
.legal-panel,
.info-card,
.model-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel-bg);
}

.ai-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  min-height: 54px;
  padding: 10px 12px;
}

.ai-row img,
.model-card img {
  width: 24px;
  height: 24px;
  object-fit: contain;
  border-radius: 5px;
}

.ai-row strong {
  display: block;
  color: var(--heading);
  font-size: 0.94rem;
  line-height: 1.2;
}

.ai-row span {
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.2;
}

.signal {
  width: 62px;
  height: 7px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), color-mix(in srgb, var(--accent) 20%, transparent));
}

.consensus-preview {
  padding: 14px;
  background: color-mix(in srgb, var(--panel-bg) 86%, var(--success-soft));
}

.consensus-preview strong {
  display: block;
  color: var(--heading);
  font-size: 0.95rem;
}

.consensus-preview p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.5;
}

.section {
  padding: clamp(42px, 6vw, 70px) 0;
}

.section h2,
.page-content h2 {
  margin: 0 0 12px;
  color: var(--heading);
  font-size: clamp(1.32rem, 2.4vw, 1.75rem);
  line-height: 1.15;
}

.page-content h2 {
  font-size: clamp(1.18rem, 2vw, 1.48rem);
  line-height: 1.2;
}

.section-intro {
  max-width: 640px;
  margin: 0 0 24px;
  color: var(--muted);
}

.card-grid,
.model-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.model-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.info-card,
.model-card {
  padding: 18px;
  box-shadow: none;
}

.info-card .kicker,
.model-card .provider {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.info-card h3,
.model-card h3 {
  margin: 0 0 8px;
  color: var(--heading);
  font-size: 1rem;
}

.info-card p,
.model-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.93rem;
  line-height: 1.55;
}

.model-card {
  min-height: 180px;
}

.model-card img {
  width: 36px;
  height: 36px;
  margin-bottom: 12px;
}

.dark-mode .model-card img[src*="chatgpt"],
.dark-mode .model-card img[src*="grok"],
.dark-mode .ai-row img[src*="chatgpt"],
.dark-mode .ai-row img[src*="grok"] {
  filter: invert(1);
}

.page-header {
  padding: clamp(42px, 6vw, 72px) 0 22px;
}

.page-header .lead {
  font-size: 1.02rem;
}

.page-content {
  display: grid;
  gap: 12px;
  padding: 0 0 68px;
}

.legal-panel {
  padding: clamp(16px, 2.4vw, 22px);
  box-shadow: none;
}

.legal-panel p,
.legal-panel ul {
  margin: 8px 0 0;
}

.legal-panel ul {
  padding-left: 20px;
}

.legal-panel li + li {
  margin-top: 6px;
}

.notice {
  border-color: color-mix(in srgb, var(--accent) 22%, var(--border));
  background: color-mix(in srgb, var(--panel-bg) 90%, var(--accent-soft));
}

.subtle {
  color: var(--muted);
}

canvas {
  display: block;
  max-width: 100%;
  margin: 10px 0 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel-soft);
}

.constellation-bg {
  max-width: none;
  margin: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
}

.footer {
  margin-top: 46px;
  padding: 24px 0 36px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.92rem;
}

.footer-inner {
  width: min(var(--maxw), calc(100% - 32px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 14px;
}

@media (max-width: 860px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 42px;
  }

  .card-grid,
  .model-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .landing-title {
    font-size: 3.2rem;
  }
}

@media (max-width: 640px) {
  .site-nav {
    padding-inline: 16px;
  }

  .nav-links {
    gap: 10px;
    font-size: 0.84rem;
  }

  .nav-links a:not(.nav-cta) {
    display: none;
  }

  .hero h1,
  .page-header h1 {
    font-size: clamp(2.25rem, 15vw, 3.4rem);
  }

  .landing-title {
    font-size: 2.7rem;
  }

  .hero-visual {
    border-radius: 10px;
  }

  .card-grid,
  .model-grid {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .footer-links {
    justify-content: flex-start;
  }
}