/* =========================================================
   Design tokens — Tokyo Night Dark (mirrors src/theme/themes.ts)
   ========================================================= */
:root {
  --bg-canvas:   #0d0e17;
  --bg-header:   #16161e;
  --bg-panel:    #1a1b26;
  --bg-base:     #1f2335;
  --bg-elevated: #24283b;
  --bg-selected: #364a82;

  --accent:         #7aa2f7;
  --accent-hover:   #5d87f5;
  --logo-secondary: #bb9af7;

  --text-primary:   #c0caf5;
  --text-secondary: #a9b1d6;
  --text-muted:     #565f89;

  --border-active:   #7aa2f7;
  --border-inactive: #3b4261;

  --value:   #73daca;
  --success: #9ece6a;
  --error:   #f7768e;

  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
  --font-body: system-ui, -apple-system, 'Segoe UI', sans-serif;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background: var(--bg-canvas);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

img, pre { max-width: 100%; }

/* =========================================================
   Layout
   ========================================================= */
.container {
  max-width: 1100px;
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 2.5rem;
}

/* =========================================================
   Navigation
   ========================================================= */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-header);
  border-bottom: 1px solid var(--border-inactive);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
}

.nav-logo-mark {
  color: var(--accent);
  font-size: 1.25rem;
  letter-spacing: -0.05em;
}

.nav-links {
  display: flex;
  gap: 0.25rem;
  list-style: none;
}

.nav-link {
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color 0.15s, background 0.15s;
}

.nav-link:hover,
.nav-link.active {
  color: var(--accent);
  background: var(--bg-elevated);
}

.nav-cta {
  padding: 0.4rem 1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-inactive);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--text-primary);
  transition: border-color 0.15s, background 0.15s;
}

.nav-cta:hover {
  border-color: var(--accent);
  background: var(--bg-selected);
  color: var(--text-primary);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-inactive);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: 0.35rem 0.6rem;
  font-size: 1.1rem;
  cursor: pointer;
  line-height: 1;
}

@media (max-width: 720px) {
  .nav-toggle { display: flex; align-items: center; }
  .nav-links {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-header);
    border-bottom: 1px solid var(--border-inactive);
    padding: 0.75rem 1rem 1rem;
    gap: 0.25rem;
  }
  .nav-links.open { display: flex; }
  .nav-cta { display: none; }
}

/* =========================================================
   Hero
   ========================================================= */
.hero {
  padding: clamp(4rem, 10vw, 7rem) 0 clamp(3rem, 8vw, 5rem);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

@media (max-width: 860px) {
  .hero-inner { grid-template-columns: 1fr; }
}

.hero-eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--value);
  background: rgba(115, 218, 202, 0.1);
  border: 1px solid rgba(115, 218, 202, 0.3);
  border-radius: 999px;
  padding: 0.25rem 0.75rem;
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.hero-title {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1rem;
}

.hero-title-gradient {
  background: linear-gradient(135deg, var(--accent), var(--logo-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: var(--text-secondary);
  max-width: 480px;
  margin-bottom: 2rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #0d0e17;
  border: 1px solid var(--accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #0d0e17;
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-inactive);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--bg-elevated);
}

/* =========================================================
   Terminal window chrome
   ========================================================= */
.term-window {
  border: 1px solid var(--border-active);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-panel);
  box-shadow: var(--shadow);
}

.term-titlebar {
  background: var(--bg-header);
  padding: 0.55rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  border-bottom: 1px solid var(--border-inactive);
}

.term-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}

.term-dot--close  { background: #f7768e; }
.term-dot--min    { background: #e0af68; }
.term-dot--max    { background: #9ece6a; }

.term-title {
  flex: 1;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-left: -36px; /* compensate for dots to visually center */
}

.term-body {
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: clamp(0.62rem, 1.3vw, 0.78rem);
  padding: 1rem 1.25rem;
  overflow-x: auto;
  line-height: 1.7;
  margin: 0;
  white-space: pre;
}

.term-accent    { color: var(--accent); }
.term-value     { color: var(--value); }
.term-muted     { color: var(--text-muted); }
.term-secondary { color: var(--text-secondary); }
.term-success   { color: var(--success); }
.term-error     { color: var(--error); }
.term-purple    { color: var(--logo-secondary); }

/* =========================================================
   Mockup tab switcher
   ========================================================= */
.tab-switcher {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 0.4rem 0.9rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-inactive);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.15s;
}

.tab-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.tab-btn[aria-selected="true"] {
  background: var(--bg-selected);
  border-color: var(--accent);
  color: var(--accent);
}

/* =========================================================
   Features section
   ========================================================= */
.features {
  padding: clamp(3rem, 8vw, 5rem) 0;
  border-top: 1px solid var(--border-inactive);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.feature-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-inactive);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: border-color 0.15s, transform 0.15s;
}

.feature-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.feature-icon {
  font-size: 1.75rem;
  margin-bottom: 0.75rem;
  display: block;
}

.feature-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.feature-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* =========================================================
   Mockups section
   ========================================================= */
.mockups {
  padding: clamp(3rem, 8vw, 5rem) 0;
  border-top: 1px solid var(--border-inactive);
}

/* =========================================================
   Getting Started section
   ========================================================= */
.getting-started {
  padding: clamp(3rem, 8vw, 5rem) 0;
  border-top: 1px solid var(--border-inactive);
}

.steps {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.step {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 1rem;
  align-items: start;
}

.step-number {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background: var(--bg-selected);
  border: 2px solid var(--accent);
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 0.15rem;
}

.step-content h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.step-content p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.6rem;
}

.code-block {
  display: flex;
  align-items: stretch;
  background: var(--bg-elevated);
  border: 1px solid var(--border-inactive);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-top: 0.5rem;
}

.code-block code {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--value);
  padding: 0.5rem 0.75rem;
  white-space: pre-wrap;
  word-break: break-all;
}

.copy-btn {
  background: var(--bg-panel);
  border: none;
  border-left: 1px solid var(--border-inactive);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0 0.75rem;
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
  white-space: nowrap;
}

.copy-btn:hover,
.copy-btn.copied {
  color: var(--success);
  background: var(--bg-elevated);
}

/* =========================================================
   Keyboard shortcuts section
   ========================================================= */
.shortcuts {
  padding: clamp(3rem, 8vw, 5rem) 0;
  border-top: 1px solid var(--border-inactive);
}

.shortcuts-groups {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.shortcuts-group {
  background: var(--bg-panel);
  border: 1px solid var(--border-inactive);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.shortcuts-group summary {
  padding: 0.85rem 1.25rem;
  font-weight: 600;
  color: var(--accent);
  font-size: 0.95rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: background 0.15s;
  user-select: none;
}

.shortcuts-group summary::-webkit-details-marker { display: none; }

.shortcuts-group summary::before {
  content: '▶';
  font-size: 0.65rem;
  color: var(--text-muted);
  transition: transform 0.15s;
}

.shortcuts-group[open] summary::before {
  transform: rotate(90deg);
}

.shortcuts-group summary:hover { background: var(--bg-elevated); }

.shortcuts-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.shortcuts-table td {
  padding: 0.5rem 1.25rem;
  border-top: 1px solid var(--border-inactive);
  color: var(--text-secondary);
}

.shortcuts-table td:first-child {
  width: 40%;
  font-family: var(--font-mono);
}

kbd {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78em;
  background: var(--bg-elevated);
  color: var(--accent);
  border: 1px solid var(--border-inactive);
  border-radius: var(--radius-sm);
  padding: 0.1em 0.45em;
  white-space: nowrap;
}

/* =========================================================
   AI section
   ========================================================= */
.ai-section {
  padding: clamp(3rem, 8vw, 5rem) 0;
  border-top: 1px solid var(--border-inactive);
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

@media (max-width: 800px) {
  .two-col { grid-template-columns: 1fr; }
}

.ai-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.75;
  margin-bottom: 1.5rem;
}

.ai-setup-steps {
  margin: 0 0 1.5rem 1.25rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 2;
}

.ai-setup-steps li::marker { color: var(--accent); }

.model-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  margin-top: 1rem;
}

.model-table th {
  text-align: left;
  padding: 0.5rem 0.75rem;
  background: var(--bg-elevated);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-inactive);
}

.model-table td {
  padding: 0.55rem 0.75rem;
  border-bottom: 1px solid var(--border-inactive);
  color: var(--text-secondary);
}

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

.model-table td:first-child {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--value);
}

/* =========================================================
   PICT Format section
   ========================================================= */
.pict-format {
  padding: clamp(3rem, 8vw, 5rem) 0;
  border-top: 1px solid var(--border-inactive);
}

.pict-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.75;
  max-width: 700px;
  margin-bottom: 1.5rem;
}

.pict-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}

.pict-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  color: var(--accent);
  border-bottom: 1px dashed var(--border-inactive);
  padding-bottom: 1px;
}

.pict-link:hover { border-color: var(--accent); color: var(--accent-hover); }

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
  background: var(--bg-header);
  border-top: 1px solid var(--border-inactive);
  padding: 2.5rem 0;
  margin-top: 2rem;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color 0.15s;
}

.footer-link:hover { color: var(--accent); }

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* =========================================================
   Utility
   ========================================================= */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

.badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.15em 0.5em;
  border-radius: 999px;
  font-weight: 600;
}

.badge-teal {
  background: rgba(115, 218, 202, 0.12);
  color: var(--value);
  border: 1px solid rgba(115, 218, 202, 0.3);
}

.badge-accent {
  background: rgba(122, 162, 247, 0.12);
  color: var(--accent);
  border: 1px solid rgba(122, 162, 247, 0.3);
}