/* ============================================
   DEADHEAD Design System
   Reusable across site, admin panel, docs
   ============================================ */

/* --- Design Tokens --- */
:root {
  /* Colors - Light Mode */
  --color-bg: #FAF8F5;
  --color-bg-subtle: #F0EDE8;
  --color-surface: #FFFFFF;
  --color-text: #1A1A1A;
  --color-text-muted: #5C5C5C;
  --color-border: #D4D0C8;

  /* Brand */
  --color-amber: #F2A900;
  --color-amber-hover: #D99700;
  --color-amber-dark: #CC8E00;
  --color-black: #0D0D0D;

  /* Type Scale (1.25 ratio) */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.25rem;
  --text-xl: 1.563rem;
  --text-2xl: 1.953rem;
  --text-3xl: 2.441rem;
  --text-4xl: 3.052rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-8: 3rem;
  --space-10: 4rem;
  --space-12: 6rem;

  /* Layout */
  --max-width: 1100px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

/* --- Dark Mode (System Preference) --- */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0D0D0D;
    --color-bg-subtle: #1A1A1A;
    --color-surface: #242424;
    --color-text: #F5F5F5;
    --color-text-muted: #A3A3A3;
    --color-border: #333333;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  }
}

/* --- Dark Mode (Manual Override) --- */
[data-theme="dark"] {
  --color-bg: #0D0D0D;
  --color-bg-subtle: #1A1A1A;
  --color-surface: #242424;
  --color-text: #F5F5F5;
  --color-text-muted: #A3A3A3;
  --color-border: #333333;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
}

[data-theme="light"] {
  --color-bg: #FAF8F5;
  --color-bg-subtle: #F0EDE8;
  --color-surface: #FFFFFF;
  --color-text: #1A1A1A;
  --color-text-muted: #5C5C5C;
  --color-border: #D4D0C8;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
}

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

a {
  color: var(--color-amber);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* --- Typography --- */
.font-display {
  font-family: 'Oswald', 'Impact', 'Arial Narrow', sans-serif;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

h1, h2, h3, h4 {
  font-family: 'Oswald', 'Impact', 'Arial Narrow', sans-serif;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

p {
  margin-bottom: var(--space-4);
}

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

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

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.section {
  padding: var(--space-10) 0;
}

/* --- Components: Button --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-family: 'Oswald', 'Impact', 'Arial Narrow', sans-serif;
  font-size: var(--text-base);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-primary {
  background-color: var(--color-amber);
  color: var(--color-black);
  border-color: var(--color-amber);
}

.btn-primary:hover {
  background-color: var(--color-amber-hover);
  border-color: var(--color-amber-hover);
  color: var(--color-black);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-amber);
  border-color: var(--color-amber);
}

.btn-secondary:hover {
  background-color: var(--color-amber);
  color: var(--color-black);
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-ghost:hover {
  background-color: var(--color-bg-subtle);
  border-color: var(--color-text-muted);
}

/* --- Components: Input --- */
.input {
  display: block;
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-family: inherit;
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input:focus {
  outline: none;
  border-color: var(--color-amber);
  box-shadow: 0 0 0 3px rgba(242, 169, 0, 0.2);
}

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

.input-group {
  display: flex;
  gap: var(--space-2);
}

.input-group .input {
  flex: 1;
}

@media (max-width: 480px) {
  .input-group {
    flex-direction: column;
  }

  .input-group .btn {
    width: 100%;
  }
}

/* --- Components: Card --- */
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
}

.card-title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
}

.card-text {
  color: var(--color-text-muted);
  margin-bottom: 0;
}

.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 640px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* --- Components: Nav --- */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) 0;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-brand img,
.nav-brand svg {
  height: 40px;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
}

.nav-link {
  color: var(--color-text);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-amber);
}

/* --- Components: Footer --- */
.footer {
  padding: var(--space-6) 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.footer a {
  color: var(--color-text-muted);
}

.footer a:hover {
  color: var(--color-amber);
}

/* --- Utilities --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }

/* --- Prose (Markdown Content) --- */
.prose {
  line-height: 1.7;
}

.prose h1,
.prose h2,
.prose h3,
.prose h4 {
  margin-top: var(--space-8);
  margin-bottom: var(--space-4);
}

.prose h1:first-child,
.prose h2:first-child,
.prose h3:first-child {
  margin-top: 0;
}

.prose p {
  margin-bottom: var(--space-4);
}

.prose ul,
.prose ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

.prose li {
  margin-bottom: var(--space-2);
}

.prose a {
  text-decoration: underline;
  text-underline-offset: 2px;
}

.prose img {
  border-radius: var(--radius-md);
  margin: var(--space-6) 0;
}

.prose blockquote {
  border-left: 4px solid var(--color-amber);
  padding-left: var(--space-4);
  margin: var(--space-6) 0;
  color: var(--color-text-muted);
  font-style: italic;
}

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

/* --- Code Blocks --- */
.prose code {
  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.9em;
  background-color: var(--color-bg-subtle);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
}

.prose pre {
  position: relative;
  background-color: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  overflow-x: auto;
  margin: var(--space-6) 0;
}

.prose pre code {
  background: none;
  padding: 0;
  font-size: var(--text-sm);
  line-height: 1.5;
}

.code-copy-btn {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.prose pre:hover .code-copy-btn {
  opacity: 1;
}

.code-copy-btn:hover {
  background-color: var(--color-amber);
  color: var(--color-black);
  border-color: var(--color-amber);
}

/* --- Tags --- */
.tag {
  display: inline-block;
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background-color: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  margin-right: var(--space-2);
}

/* --- Docs Layout --- */
.docs-layout {
  padding-top: var(--space-6);
}

.docs-wrapper {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .docs-wrapper {
    grid-template-columns: 220px 1fr;
  }
}

.docs-sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.docs-sidebar-link {
  display: block;
  padding: var(--space-2) var(--space-3);
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.docs-sidebar-link:hover {
  background-color: var(--color-bg-subtle);
  color: var(--color-amber);
}

.docs-sidebar-link.active {
  background-color: var(--color-amber);
  color: var(--color-black);
}

.docs-content {
  min-width: 0;
}

.docs-content h1 {
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

/* --- Roadmap --- */
.roadmap-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .roadmap-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.roadmap-column {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}

.roadmap-column-title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--color-amber);
}

.roadmap-list {
  list-style: none;
}

.roadmap-item {
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
}

.roadmap-item:last-child {
  border-bottom: none;
}

.roadmap-item strong {
  display: block;
  margin-bottom: var(--space-1);
}

.roadmap-item span {
  font-size: var(--text-sm);
}

/* --- Press Kit --- */
.press-section {
  margin-bottom: var(--space-8);
}

.press-section h2 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border);
}

.fact-sheet {
  width: 100%;
  border-collapse: collapse;
}

.fact-sheet th,
.fact-sheet td {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.fact-sheet th {
  width: 140px;
  font-weight: 600;
  color: var(--color-text-muted);
}

.logo-downloads {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.screenshots-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-4);
}

.screenshots-grid img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  transition: transform var(--transition-fast);
}

.screenshots-grid a:hover img {
  transform: scale(1.02);
}

/* --- Nav Active State --- */
.nav-link.active {
  color: var(--color-amber);
}

/* --- Mobile Nav --- */
@media (max-width: 640px) {
  .nav {
    flex-wrap: wrap;
    gap: var(--space-3);
  }

  .nav-links {
    width: 100%;
    justify-content: center;
    gap: var(--space-3);
    font-size: var(--text-sm);
  }
}