/* ── CSS Custom Properties ──────────────────────────────────────────── */
:root {
  --bg-primary: #0C0C0C;
  --bg-secondary: #141414;
  --bg-tertiary: #1A1A1A;
  --bg-hover: #222222;
  --bg-active: #333333;
  --border: #444444;
  --border-light: #333333;
  --text-primary: #F2F2F2;
  --text-secondary: #CCCCCC;
  --text-muted: #888888;
  --accent: #D77757;
  --accent-hover: #E08B6D;
  --accent-subtle: rgba(215, 119, 87, 0.15);
  --success: #5FCC68;
  --font-mono: "SF Mono", "Cascadia Code", "Fira Code", Consolas, monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --radius: 8px;
  --radius-sm: 4px;
  --transition: 150ms ease;
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

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

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--bg-tertiary);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
  font-size: inherit;
}

/* ── Container ─────────────────────────────────────────────────────── */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ── Header ────────────────────────────────────────────────────────── */
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 24px 0;
}

.site-header .container {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.brand { display: flex; align-items: center; gap: 10px; }
.mark { width: 28px; height: 28px; color: var(--accent); flex-shrink: 0; }

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-family: var(--font-mono);
}

.subhead {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: 6px;
}

.tagline {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-top: 16px;
}

.about {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-top: 8px;
  line-height: 1.5;
}

.github-link {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  font-size: 0.85rem;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--transition);
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: 4px;
}
.github-link:hover {
  color: var(--text-primary);
  border-color: var(--text-muted);
  text-decoration: none;
}

/* ── Install (output panel) ────────────────────────────────────────── */
.output-panel {
  margin-top: 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.output-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.output-title { font-size: 1rem; font-weight: 600; }

.output-tabs { display: flex; gap: 4px; }

.output-tab {
  padding: 4px 12px;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: all var(--transition);
}
.output-tab:hover { color: var(--text-primary); background: var(--bg-hover); }
.output-tab.active { color: var(--accent); background: var(--accent-subtle); }

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

.code-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-light);
}

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

.copy-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  font-size: 0.75rem;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.copy-btn:hover { color: var(--accent); border-color: var(--accent); }
.copy-btn.copied { color: var(--success); border-color: var(--success); }

.code-block {
  padding: 16px;
  margin: 0;
  background: var(--bg-primary);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--text-secondary);
  overflow-x: auto;
  white-space: pre;
  tab-size: 2;
}

.install-note {
  padding: 12px 20px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-light);
  color: var(--text-muted);
  font-size: 0.8rem;
}
.install-note code { color: var(--text-secondary); }

/* ── Run command ───────────────────────────────────────────────────── */
.run-section { margin-top: 20px; }

.run-cmd {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 16px 20px;
}
.run-cmd code {
  flex: 1;
  min-width: 0;
  overflow-x: auto;
  background: none;
  padding: 0;
  font-size: 0.95rem;
  color: var(--text-primary);
  white-space: nowrap;
}
.run-cmd .copy-btn { flex-shrink: 0; }

.run-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 12px;
}
.run-desc code { color: var(--accent); }

/* ── Sections ──────────────────────────────────────────────────────── */
.section { margin-top: 56px; }

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

.section-lead {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 8px;
  max-width: 640px;
}

/* ── Lenses grid ───────────────────────────────────────────────────── */
.lenses-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 20px;
}

.lens-card {
  position: relative;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  background: var(--bg-secondary);
  transition: border-color var(--transition), transform var(--transition);
}
.lens-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.lens-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  background: var(--accent-subtle);
  padding: 2px 8px;
  border-radius: 10px;
}

.lens-name {
  font-size: 1rem;
  font-weight: 600;
  margin-top: 12px;
}

.lens-q {
  color: var(--accent);
  font-style: italic;
  font-size: 0.8rem;
  margin-top: 6px;
}

.lens-body {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-top: 8px;
}

/* ── Buttons ───────────────────────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
  padding: 11px 24px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: var(--radius);
  transition: background var(--transition);
}
.btn-primary:hover { background: var(--accent-hover); text-decoration: none; }

/* ── Command list ──────────────────────────────────────────────────── */
.cmd-list {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.cmd-row {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.cmd-row:hover { background: var(--bg-secondary); }

.cmd-row code {
  flex-shrink: 0;
  width: 160px;
  color: var(--accent);
  background: none;
  padding: 0;
  font-size: 0.85rem;
}

.cmd-row span {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

/* ── Closing CTA ───────────────────────────────────────────────────── */
.cta-final {
  margin: 72px 0 40px;
  padding: 40px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-secondary);
  text-align: center;
}

.cta-title {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.cta-sub {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 8px;
}
.cta-sub code { color: var(--accent); }

.cta-box {
  display: flex;
  align-items: stretch;
  gap: 10px;
  max-width: 520px;
  margin: 20px auto 0;
  text-align: left;
}

.cta-box .code-block {
  flex: 1;
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.cta-box .copy-btn { flex-shrink: 0; align-self: flex-start; }

/* ── Responsive ────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .site-header .container {
    flex-direction: column;
    gap: 12px;
  }
  .github-link { align-self: flex-start; margin-top: 0; }

  .lenses-grid { grid-template-columns: 1fr; }

  .cmd-row { flex-direction: column; gap: 2px; }
  .cmd-row code { width: auto; }

  .output-header {
    flex-direction: column;
    gap: 8px;
    align-items: flex-start;
  }

  .code-block { font-size: 0.7rem; padding: 12px; }
}

/* ── Scrollbar ─────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--bg-active); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ── Selection ─────────────────────────────────────────────────────── */
::selection { background: var(--accent-subtle); color: var(--accent-hover); }