/* ── Reset & Variables ─────────────────────────────────────────── */

:root {
  --bg: #FFFFFF;
  --bg-subtle: #F8FAFC;
  --card: #FFFFFF;
  --card-border: #E2E8F0;
  --text: #0F172A;
  --text-muted: #64748B;
  --accent: #EF4444;
  --accent-hover: #DC2626;
  --code-bg: #F1F5F9;
  --code-border: #E2E8F0;
  --font: system-ui, -apple-system, 'Segoe UI', sans-serif;
  --mono: ui-monospace, 'Cascadia Code', 'Fira Code', 'JetBrains Mono', monospace;
  --max-w: 720px;
  --transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

[data-theme="dark"] {
  --bg: #0F172A;
  --bg-subtle: #1E293B;
  --card: #1E293B;
  --card-border: #334155;
  --text: #E2E8F0;
  --text-muted: #94A3B8;
  --accent: #EF4444;
  --accent-hover: #F87171;
  --code-bg: #1E293B;
  --code-border: #334155;
}

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

/* ── Base ──────────────────────────────────────────────────────── */

html { scroll-behavior: smooth; }

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

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

/* ── Nav ───────────────────────────────────────────────────────── */

nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg);
  border-bottom: 1px solid var(--card-border);
  transition: var(--transition);
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1.125rem;
}

.nav-brand img { height: 24px; width: 24px; }

.nav-spacer { flex: 1; }

.nav-link {
  color: var(--text-muted);
  transition: color 0.15s;
  display: flex;
  align-items: center;
}

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

#theme-toggle {
  background: none;
  border: 1px solid var(--card-border);
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.375rem 0.5rem;
  border-radius: 6px;
  font-size: 1rem;
  line-height: 1;
  transition: var(--transition);
  display: flex;
  align-items: center;
}

#theme-toggle:hover { color: var(--text); border-color: var(--text-muted); }

/* ── Sections ──────────────────────────────────────────────────── */

.container {
  max-width: var(--max-w);
  margin: 2rem auto;
  padding: 1rem 1.5rem;
}

section { padding: 3.5rem 0; }

section + section { border-top: 1px solid var(--card-border); }

.section-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  letter-spacing: -0.01em;
}

/* ── Hero ──────────────────────────────────────────────────────── */

.hero {
  text-align: center;
  padding: 5rem 0 3rem;
  border-bottom: none;
}

.hero + section { border-top: none; }

.hero-logo { height: 80px; width: 80px; margin-bottom: 1.25rem; }

.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.5rem;
}

.hero .tagline {
  color: var(--text-muted);
  font-size: 1.125rem;
  margin-bottom: 2rem;
}

.hero-install {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 8px;
  padding: 0.625rem 1rem;
  font-family: var(--mono);
  font-size: 0.875rem;
  transition: var(--transition);
}

.hero-install code { color: var(--text); }

.copy-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 4px;
  font-size: 0.875rem;
  line-height: 1;
  transition: color 0.15s;
}

.copy-btn:hover { color: var(--text); }

/* ── Features ──────────────────────────────────────────────────── */

.features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.feature {
  padding: 1rem 1.25rem;
  border-radius: 8px;
  border: 1px solid var(--card-border);
  background: var(--card);
  transition: var(--transition);
}

.feature-title {
  font-weight: 600;
  font-size: 0.9375rem;
  margin-bottom: 0.25rem;
}

.feature-desc {
  color: var(--text-muted);
  font-size: 0.8125rem;
  line-height: 1.5;
}

/* ── Tabs (Install) ────────────────────────────────────────────── */

.tabs {
  display: flex;
  gap: 0.25rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--card-border);
  padding-bottom: 0;
}

.tab-btn {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  font-family: var(--font);
  font-weight: 500;
  transition: color 0.15s, border-color 0.15s;
  margin-bottom: -1px;
}

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

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

.tab-content { display: none; }
.tab-content.active { display: block; }

/* ── Code Blocks ───────────────────────────────────────────────── */

pre {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.8125rem;
  line-height: 1.7;
  transition: var(--transition);
  position: relative;
}

pre + pre { margin-top: 0.75rem; }

code {
  font-family: var(--mono);
  font-size: 0.8125rem;
}

p code, li code, td code {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 4px;
  padding: 0.125rem 0.375rem;
  font-size: 0.8125rem;
  transition: var(--transition);
}

/* Syntax colors */
.kw { color: #8B5CF6; }         /* keyword: purple */
.str { color: #059669; }        /* string: green */
.cm { color: var(--text-muted); font-style: italic; } /* comment */
.fn { color: #2563EB; }         /* function: blue */
.op { color: var(--text-muted); } /* operator */

[data-theme="dark"] .kw { color: #A78BFA; }
[data-theme="dark"] .str { color: #34D399; }
[data-theme="dark"] .fn { color: #60A5FA; }

/* ── Steps ─────────────────────────────────────────────────────── */

.steps { counter-reset: step; }

.step {
  margin-bottom: 1.5rem;
}

.step-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  font-size: 0.8125rem;
  font-weight: 700;
  flex-shrink: 0;
}

.step-label {
  font-weight: 600;
  font-size: 0.9375rem;
}

/* ── API Table ─────────────────────────────────────────────────── */

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

.api-table th {
  text-align: left;
  font-weight: 600;
  padding: 0.625rem 0.75rem;
  border-bottom: 2px solid var(--card-border);
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.api-table td {
  padding: 0.625rem 0.75rem;
  border-bottom: 1px solid var(--card-border);
  vertical-align: top;
}

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

/* ── Agent Grid ────────────────────────────────────────────────── */

.agents {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.agent-card {
  padding: 1rem 1.25rem;
  border: 1px solid var(--card-border);
  border-radius: 8px;
  background: var(--card);
  transition: var(--transition);
}

.agent-name {
  font-weight: 600;
  font-size: 0.9375rem;
  margin-bottom: 0.25rem;
}

.agent-desc {
  color: var(--text-muted);
  font-size: 0.8125rem;
  margin-bottom: 0.5rem;
}

.agent-env {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ── Footer ────────────────────────────────────────────────────── */

footer {
  border-top: 1px solid var(--card-border);
  padding: 2rem 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8125rem;
}

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

/* ── Responsive ────────────────────────────────────────────────── */

@media (max-width: 640px) {
  .hero { padding: 3rem 0 2rem; }
  .hero h1 { font-size: 2rem; }
  .hero-install { font-size: 0.75rem; }
  .features { grid-template-columns: 1fr; }
  .agents { grid-template-columns: 1fr; }
  .tabs { flex-wrap: wrap; }
  section { padding: 2rem 0; }
}