/*
 * Cobalt - Static Website Stylesheet
 * Matches Cobalt's Material 3 theme, palettes, and typography.
 * Zero-telemetry, zero-remote fonts, accessible contrast.
 */

:root {
  /* Cobalt Light Palette */
  --bg: #FDFBF9;
  --surface: #FDFBF9;
  --surface-container: #F5EFE9;
  --surface-container-high: #ECE4DC;
  --surface-variant: #F7EFE9;
  --text: #171717;
  --text-muted: #5C554E;
  --text-dim: #7C736B;
  --primary: #FF6F1E;
  --primary-hover: #E65A0D;
  --on-primary: #FFFFFF;
  --secondary: #CE500A;
  --outline: rgba(23, 23, 23, 0.15);
  --outline-strong: rgba(23, 23, 23, 0.35);
  --card-shadow: 0 4px 20px rgba(43, 26, 7, 0.06);
  --badge-bg: rgba(255, 111, 30, 0.12);
  --badge-text: #CE500A;
  --code-bg: #EFE8E1;

  /* Category Accents */
  --cat-link: #42A5F5;
  --cat-image: #AB47BC;
  --cat-video: #EF5350;
  --cat-text: #FFA726;
  --cat-code: #66BB6A;
  --cat-audio: #26A69A;
  --cat-media: #E91E63;

  /* Typography & Layout */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 9999px;
  --max-w-content: 1100px;
  --max-w-prose: 780px;
}

[data-theme="dark"] {
  /* Cobalt Dark Palette */
  --bg: #1A120E;
  --surface: #1A120E;
  --surface-container: #241C18;
  --surface-container-high: #2E2420;
  --surface-variant: #52443D;
  --text: #F0DFD8;
  --text-muted: #C0B0A8;
  --text-dim: #90847D;
  --primary: #FFB690;
  --primary-hover: #FFA270;
  --on-primary: #542202;
  --secondary: #E6BEAB;
  --outline: rgba(240, 223, 216, 0.16);
  --outline-strong: rgba(240, 223, 216, 0.32);
  --card-shadow: 0 4px 24px rgba(0, 0, 0, 0.45);
  --badge-bg: rgba(255, 182, 144, 0.16);
  --badge-text: #FFB690;
  --code-bg: #2E2420;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1A120E;
    --surface: #1A120E;
    --surface-container: #241C18;
    --surface-container-high: #2E2420;
    --surface-variant: #52443D;
    --text: #F0DFD8;
    --text-muted: #C0B0A8;
    --text-dim: #90847D;
    --primary: #FFB690;
    --primary-hover: #FFA270;
    --on-primary: #542202;
    --secondary: #E6BEAB;
    --outline: rgba(240, 223, 216, 0.16);
    --outline-strong: rgba(240, 223, 216, 0.32);
    --card-shadow: 0 4px 24px rgba(0, 0, 0, 0.45);
    --badge-bg: rgba(255, 182, 144, 0.16);
    --badge-text: #FFB690;
    --code-bg: #2E2420;
  }
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Accessibility Focus */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
}

/* Skip link for keyboard accessibility */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  background: var(--primary);
  color: var(--on-primary);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  z-index: 1000;
  text-decoration: none;
  transition: top 0.15s ease-out;
}
.skip-link:focus {
  top: 16px;
}

/* Header & Nav */
header.site-header {
  border-bottom: 1px solid var(--outline);
  background-color: var(--surface);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
}

.header-container {
  max-width: var(--max-w-content);
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

nav.site-nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

nav.site-nav a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.15s ease;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
}

nav.site-nav a:hover,
nav.site-nav a.active {
  color: var(--text);
  background: var(--surface-container);
}

.theme-toggle-btn {
  background: var(--surface-container);
  border: 1px solid var(--outline);
  color: var(--text);
  width: 36px;
  height: 36px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.05rem;
  transition: background 0.15s ease;
}
.theme-toggle-btn:hover {
  background: var(--surface-container-high);
}

/* Layout container */
main {
  flex: 1;
}

.container {
  max-width: var(--max-w-content);
  margin: 0 auto;
  padding: 48px 20px;
}

.container-prose {
  max-width: var(--max-w-prose);
  margin: 0 auto;
  padding: 48px 20px;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 48px 20px 32px;
  max-width: 860px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background-color: var(--badge-bg);
  color: var(--badge-text);
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 18px;
}

.hero-lead {
  font-size: clamp(1.05rem, 2.5vw, 1.25rem);
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: transform 0.1s ease, background-color 0.15s ease, box-shadow 0.15s ease;
}
.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background-color: var(--primary);
  color: var(--on-primary);
  box-shadow: 0 2px 10px rgba(255, 111, 30, 0.25);
}
.btn-primary:hover {
  background-color: var(--primary-hover);
}

.btn-secondary {
  background-color: var(--surface-container);
  color: var(--text);
  border: 1px solid var(--outline);
}
.btn-secondary:hover {
  background-color: var(--surface-container-high);
}

/* Banner Image */
.hero-banner-wrap {
  margin: 20px auto 48px;
  max-width: 980px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--outline);
  box-shadow: var(--card-shadow);
}
.hero-banner-wrap img {
  width: 100%;
  height: auto;
  display: block;
}

/* Feature Grid */
.section-title {
  text-align: center;
  margin-bottom: 36px;
}
.section-title h2 {
  font-size: 1.9rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}
.section-title p {
  color: var(--text-muted);
  font-size: 1rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-bottom: 56px;
}

.feature-card {
  background-color: var(--surface-container);
  border: 1px solid var(--outline);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.feature-icon-wrap {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 4px;
}

.feature-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.55;
}

/* Screenshots Carousel/Grid */
.screenshots-section {
  margin: 64px 0;
}

.screenshots-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  justify-items: center;
}

.screenshot-item {
  background-color: var(--surface-container);
  border: 1px solid var(--outline);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  max-width: 280px;
  transition: transform 0.2s ease;
}
.screenshot-item:hover {
  transform: translateY(-4px);
}
.screenshot-item img {
  width: 100%;
  height: auto;
  display: block;
}
.screenshot-item figcaption {
  padding: 12px 14px;
  font-size: 0.85rem;
  font-weight: 600;
  text-align: center;
  color: var(--text-muted);
}

/* Attribution Banner */
.attribution-card {
  background-color: var(--surface-container);
  border: 1px solid var(--outline);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 48px auto;
  max-width: 860px;
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.55;
}
.attribution-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}
.attribution-card p + p {
  margin-top: 8px;
}

/* Prose & Legal Pages */
.legal-header {
  border-bottom: 1px solid var(--outline);
  padding-bottom: 24px;
  margin-bottom: 32px;
}
.legal-header h1 {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}
.legal-header .meta {
  color: var(--text-dim);
  font-size: 0.9rem;
}

.legal-content h2 {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-top: 36px;
  margin-bottom: 12px;
  color: var(--text);
}

.legal-content p {
  color: var(--text-muted);
  margin-bottom: 16px;
  font-size: 1rem;
  line-height: 1.65;
}

.legal-content ul, .legal-content ol {
  color: var(--text-muted);
  margin-left: 24px;
  margin-bottom: 18px;
}

.legal-content li {
  margin-bottom: 8px;
}

.legal-content a {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Callback / App Link Fallback UI */
.callback-card {
  background-color: var(--surface-container);
  border: 1px solid var(--outline);
  border-radius: var(--radius-lg);
  padding: 40px 28px;
  text-align: center;
  max-width: 520px;
  margin: 60px auto;
  box-shadow: var(--card-shadow);
}
.callback-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-pill);
  background: var(--badge-bg);
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 20px;
}
.callback-card h1 {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 12px;
}
.callback-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.5;
  margin-bottom: 24px;
}

/* Footer */
footer.site-footer {
  border-top: 1px solid var(--outline);
  background-color: var(--surface-container);
  padding: 40px 20px 32px;
  margin-top: auto;
}

.footer-container {
  max-width: var(--max-w-content);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
  align-items: center;
  text-align: center;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
}

.footer-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
}
.footer-nav a:hover {
  color: var(--text);
  text-decoration: underline;
}

.footer-copy {
  color: var(--text-dim);
  font-size: 0.82rem;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Mobile responsive adjustments */
@media (max-width: 640px) {
  .header-container {
    padding: 12px 16px;
  }
  nav.site-nav {
    gap: 8px;
  }
  nav.site-nav a {
    font-size: 0.88rem;
    padding: 4px 6px;
  }
  .container {
    padding: 32px 16px;
  }
  .hero {
    padding: 32px 12px 24px;
  }
}