/* ═══════════════════════════════════════════════════════════════════════════
   Prompt Control Plane — Shared Design System
   Dark/Light theme, typography, nav, footer, components
   ═══════════════════════════════════════════════════════════════════════════ */

/* ─── Theme Tokens ───────────────────────────────────────────────────────── */
:root {
  /* Dark theme (default) */
  --bg: #0a0a0f;
  --surface: #12121a;
  --border: #1e1e2e;
  --text: #e4e4ed;
  --text-muted: #8888a0;
  --accent: #7c5cfc;
  --accent-hover: #9178ff;
  --accent-glow: rgba(124, 92, 252, 0.15);
  --green: #34d399;
  --orange: #fb923c;
  --blue: #60a5fa;
  --red: #f87171;
  --input-bg: #1a1a28;
  --nav-bg: rgba(10, 10, 15, 0.92);
  --code-bg: #1a1a28;
  --tag-free-bg: rgba(52, 211, 153, 0.1);
  --tag-metered-bg: rgba(251, 146, 60, 0.1);
  color-scheme: dark;
}

[data-theme="light"] {
  --bg: #f8f9fc;
  --surface: #ffffff;
  --border: #e2e4ea;
  --text: #1a1a2e;
  --text-muted: #6b6b80;
  --accent: #6c4ce6;
  --accent-hover: #5a3dd0;
  --accent-glow: rgba(108, 76, 230, 0.1);
  --green: #10b981;
  --orange: #f59e0b;
  --blue: #3b82f6;
  --red: #ef4444;
  --input-bg: #f1f3f7;
  --nav-bg: rgba(248, 249, 252, 0.92);
  --code-bg: #f1f3f7;
  --tag-free-bg: rgba(16, 185, 129, 0.08);
  --tag-metered-bg: rgba(245, 158, 11, 0.08);
  color-scheme: light;
}

/* ─── Reset & Base ───────────────────────────────────────────────────────── */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

code, .mono {
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
}

.container { max-width: 800px; margin: 0 auto; padding: 0 24px; }
.container-wide { max-width: 1000px; margin: 0 auto; padding: 0 24px; }

/* ─── Nav ────────────────────────────────────────────────────────────────── */
nav {
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 100;
}
nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo {
  font-weight: 700;
  font-size: 16px;
  color: var(--text);
  letter-spacing: -0.02em;
}
.logo span { color: var(--accent); }
.nav-links { display: flex; gap: 20px; font-size: 14px; align-items: center; }
.nav-links a { color: var(--text-muted); transition: color 0.15s; }
.nav-links a:hover { color: var(--text); }
.nav-links a.active { color: var(--accent); font-weight: 600; }

/* Hamburger (mobile) */
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 4px; }
.nav-toggle svg { width: 22px; height: 22px; stroke: var(--text-muted); fill: none; stroke-width: 2; }

@media (max-width: 700px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 16px 24px;
    gap: 12px;
  }
  .nav-links.open { display: flex; }
}

/* ─── Theme Toggle ───────────────────────────────────────────────────────── */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  padding: 6px 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.15s;
}
.theme-toggle:hover { border-color: var(--text-muted); }
.theme-toggle svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: var(--text-muted);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
/* Show sun in dark mode, moon in light mode */
.theme-toggle .icon-sun { display: block; }
.theme-toggle .icon-moon { display: none; }
[data-theme="light"] .theme-toggle .icon-sun { display: none; }
[data-theme="light"] .theme-toggle .icon-moon { display: block; }

/* ─── Sections ───────────────────────────────────────────────────────────── */
.section { padding: 64px 0; }
.section-alt { background: var(--surface); }
.section-title {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}
.section-subtitle {
  font-size: 16px;
  color: var(--text-muted);
  margin-bottom: 40px;
}

/* ─── Badges ─────────────────────────────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: 4px 12px;
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 24px;
}
.badge strong { color: var(--green); }
.badge-accent {
  background: var(--accent-glow);
  color: var(--accent);
  border: none;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 12px;
  padding: 6px 14px;
}

/* ─── Buttons ────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  transition: all 0.15s;
  cursor: pointer;
  border: none;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); color: #fff; }
.btn-secondary { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { border-color: var(--text-muted); }
.btn-sm { padding: 8px 16px; font-size: 13px; }

/* ─── Cards ──────────────────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}
.card .icon { font-size: 24px; margin-bottom: 12px; }
.card h3 { font-size: 15px; font-weight: 600; margin-bottom: 6px; }
.card p { font-size: 13px; color: var(--text-muted); line-height: 1.5; }

/* ─── Grid Layouts ───────────────────────────────────────────────────────── */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }

@media (max-width: 700px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* ─── Install Blocks ─────────────────────────────────────────────────────── */
.install {
  margin: 12px auto 0;
  max-width: 600px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 24px;
  text-align: left;
}
.install-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.install code {
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 14px;
  color: var(--green);
  display: block;
  white-space: pre-wrap;
  word-break: break-all;
}

/* ─── Tables ─────────────────────────────────────────────────────────────── */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.data-table th {
  text-align: left;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  padding: 10px 12px;
  border-bottom: 2px solid var(--border);
}
.data-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
}
.data-table td:first-child { color: var(--text); font-weight: 500; }

/* ─── Tags ───────────────────────────────────────────────────────────────── */
.tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.tag-free { background: var(--tag-free-bg); color: var(--green); }
.tag-metered { background: var(--tag-metered-bg); color: var(--orange); }
.tag-accent { background: var(--accent-glow); color: var(--accent); }

/* ─── Pricing Cards ──────────────────────────────────────────────────────── */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 960px;
  margin: 0 auto;
}
@media (max-width: 800px) {
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 500px) {
  .pricing-grid { grid-template-columns: 1fr; }
}
.pricing-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px 20px;
  text-align: center;
}
.pricing-card.featured {
  border-color: var(--accent);
  position: relative;
}
.pricing-card.featured::before {
  content: 'Recommended';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 12px;
  border-radius: 20px;
}
.pricing-card .tier {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.pricing-card .price {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 4px;
}
.pricing-card .price-note {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
}
.pricing-card ul { list-style: none; text-align: left; margin-bottom: 20px; }
.pricing-card li { font-size: 13px; padding: 5px 0; color: var(--text-muted); }
.pricing-card li::before { content: '\2713'; color: var(--green); margin-right: 8px; font-weight: 700; }
.pricing-card .btn { width: 100%; justify-content: center; }

/* ─── FAQ ────────────────────────────────────────────────────────────────── */
.faq-item { padding: 20px 0; border-bottom: 1px solid var(--border); }
.faq-item:last-child { border-bottom: none; }
.faq-q { font-weight: 700; font-size: 15px; margin-bottom: 8px; }
.faq-q::before { content: 'Q: '; color: var(--accent); }
.faq-a { font-size: 14px; color: var(--text-muted); line-height: 1.6; padding-left: 24px; }

/* ─── Footer ─────────────────────────────────────────────────────────────── */
footer {
  padding: 40px 0;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}
footer a { color: var(--text-muted); }
footer a:hover { color: var(--text); }
.footer-links { display: flex; gap: 24px; justify-content: center; flex-wrap: wrap; margin-bottom: 12px; }

/* Footer Grid (3-column) */
.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  text-align: left;
  margin-bottom: 24px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.footer-col { display: flex; flex-direction: column; gap: 8px; }
.footer-col h4 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text);
  font-weight: 700;
  margin-bottom: 4px;
}
.footer-col a { font-size: 13px; }
.footer-copy {
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
@media (max-width: 500px) {
  .footer-grid { grid-template-columns: 1fr; gap: 24px; text-align: center; }
}

/* ─── Utility ────────────────────────────────────────────────────────────── */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.mt-0 { margin-top: 0; }
.mt-16 { margin-top: 16px; }
.mt-32 { margin-top: 32px; }
.mt-48 { margin-top: 48px; }
.mb-0 { margin-bottom: 0; }
.mb-16 { margin-bottom: 16px; }
.mb-32 { margin-bottom: 32px; }

/* ─── Provider Logos (models page) ────────────────────────────────────────── */
.provider-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}
.provider-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 4px;
}
.provider-card .provider-tagline {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.model-list { list-style: none; }
.model-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}
.model-list li:last-child { border-bottom: none; }
.model-name { font-weight: 600; color: var(--text); font-family: 'SF Mono', 'Fira Code', monospace; font-size: 13px; }
.model-price { color: var(--text-muted); font-size: 12px; }
.model-tier { font-size: 11px; }

/* ─── Check icon (thank-you page) ────────────────────────────────────────── */
.check-icon {
  width: 56px;
  height: 56px;
  background: rgba(52, 211, 153, 0.1);
  border: 2px solid var(--green);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
}
.check-icon svg {
  width: 28px;
  height: 28px;
  stroke: var(--green);
  fill: none;
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}