/* ─── Variables ──────────────────────────────────────────────────────────── */
:root {
  --bg:         #fafafa;
  --surface:    #ffffff;
  --surface-2:  #f4f4f5;
  --text:       #18181b;
  --text-muted: #71717a;
  --accent:     #4f46e5;
  --accent-h:   #4338ca;
  --accent-fg:  #ffffff;
  --border:     #e4e4e7;
  --code-bg:    #18181b;
  --code-text:  #e8e8f0;
  --radius:     8px;
  --nav-h:      56px;
}

[data-theme="dark"] {
  --bg:         #09090b;
  --surface:    #18181b;
  --surface-2:  #27272a;
  --text:       #fafafa;
  --text-muted: #a1a1aa;
  --accent:     #818cf8;
  --accent-h:   #a5b4fc;
  --accent-fg:  #0f0f1a;
  --border:     #27272a;
  --code-bg:    #0c0c0e;
  --code-text:  #e8e8f0;
}

/* ─── Reset ──────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
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;
  font-size: 1rem;
  transition: background 0.15s, color 0.15s;
}

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

/* Theme-aware SVG logo fills */
.logo-muted { fill: var(--text-muted); }  /* tagline in hero logo */
a:hover { text-decoration: underline; }

code {
  font-family: ui-monospace, 'Cascadia Code', Menlo, Consolas, monospace;
  font-size: 0.875em;
  background: var(--surface-2);
  padding: 0.1em 0.35em;
  border-radius: 4px;
  border: 1px solid var(--border);
}

/* ─── Layout ─────────────────────────────────────────────────────────────── */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section { padding: 5rem 0; }

.section-header { text-align: center; margin-bottom: 3rem; }

.section-title {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.6rem;
}

.section-sub {
  font-size: 1.05rem;
  color: var(--text-muted);
}

/* ─── Nav ────────────────────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  transition: background 0.15s, border-color 0.15s;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.nav-logo {
  display: inline-flex;
  align-items: center;
  line-height: 1;
  color: var(--text);  /* currentColor for SVG fills */
}

.nav-logo:hover { text-decoration: none; opacity: 0.8; }

.nav-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.15s;
}

.nav-link:hover { color: var(--text); text-decoration: none; }
.nav-link svg { width: 16px; height: 16px; fill: currentColor; }

.theme-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
  flex-shrink: 0;
}

.theme-btn:hover { color: var(--text); border-color: var(--text-muted); }
.theme-btn svg { width: 16px; height: 16px; pointer-events: none; }

/* Show sun (→ switch to light) in dark mode; moon (→ switch to dark) in light mode */
[data-theme="dark"]  .icon-sun  { display: block; }
[data-theme="dark"]  .icon-moon { display: none;  }
[data-theme="light"] .icon-sun  { display: none;  }
[data-theme="light"] .icon-moon { display: block; }

/* ─── Buttons ────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius);
  font-size: 0.925rem;
  font-weight: 500;
  text-decoration: none;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  border: 1px solid transparent;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-fg);
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-h);
  border-color: var(--accent-h);
  text-decoration: none;
  color: var(--accent-fg);
}

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

.btn-ghost:hover { border-color: var(--text-muted); text-decoration: none; }

/* ─── Hero ───────────────────────────────────────────────────────────────── */
.hero { padding: 5rem 0; }

.hero-inner {
  max-width: 680px;
  text-align: center;
}

.hero-logo-h1 {
  margin-bottom: 1rem;
  color: var(--text);  /* currentColor for SVG fills */
}

.hero-logo-svg {
  display: block;
  width: 100%;
  max-width: 340px;
  margin: 0 auto;
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--text-muted);
  line-height: 1.75;
  max-width: 540px;
  margin: 0 auto 2rem;
}

.hero-cta { display: flex; flex-wrap: wrap; gap: 0.75rem; justify-content: center; }

/* ─── Features ───────────────────────────────────────────────────────────── */
.features {
  background: var(--surface-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.feature-icon {
  width: 36px;
  height: 36px;
  color: var(--accent);
  margin-bottom: 1rem;
}

.feature-icon svg { width: 100%; height: 100%; }

.feature-card h2 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ─── Screenshots ────────────────────────────────────────────────────────── */
.screenshot-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.screenshot img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  object-position: center;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-2);
  display: block;
}

.screenshot figcaption {
  margin-top: 0.5rem;
  font-size: 0.825rem;
  color: var(--text-muted);
  text-align: center;
}

/* ─── Getting Started ────────────────────────────────────────────────────── */
.getting-started .section-header { text-align: left; }

.steps {
  display: flex;
  flex-direction: column;
  gap: 2.25rem;
  margin-bottom: 2rem;
}

.step { display: flex; gap: 1.25rem; align-items: flex-start; }

.step-num {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  background: var(--accent);
  color: var(--accent-fg);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  margin-top: 0.15rem;
}

.step-body { flex: 1; min-width: 0; }

.step-body h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.65rem;
}

.step-body p {
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* ─── Code blocks ────────────────────────────────────────────────────────── */
.code-block { position: relative; }

.code-block pre {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  overflow-x: auto;
  font-family: ui-monospace, 'Cascadia Code', Menlo, Consolas, monospace;
  font-size: 0.875rem;
  line-height: 1.7;
}

.code-block pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
}

.copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  padding: 0.25rem 0.65rem;
  font-size: 0.75rem;
  font-family: inherit;
  background: var(--surface-2);
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 5px;
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
}

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

.alt-install {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.alt-install summary {
  padding: 0.8rem 1rem;
  cursor: pointer;
  font-size: 0.875rem;
  color: var(--text-muted);
  list-style: none;
  user-select: none;
  transition: color 0.15s, background 0.15s;
}

.alt-install summary::-webkit-details-marker { display: none; }
.alt-install summary::before { content: '▶  '; font-size: 0.65em; }
details[open] summary::before { content: '▼  '; }
.alt-install summary:hover { color: var(--text); background: var(--surface-2); }
.alt-install .code-block { padding: 0 1rem 1rem; }

/* ─── Architecture ───────────────────────────────────────────────────────── */
.architecture {
  background: var(--surface-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.arch-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.arch-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.arch-item dt {
  font-size: 0.975rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 0.5rem;
}

.arch-item dd {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ─── Footer ─────────────────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  opacity: 0.7;
  color: var(--text);  /* currentColor for SVG fills */
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer-links a { color: var(--text-muted); }
.footer-links a:hover { color: var(--text); text-decoration: none; }
.footer-sep { opacity: 0.4; }

/* ─── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .section { padding: 3rem 0; }
  .hero { padding: 3rem 0 2.5rem; }

  .feature-grid { grid-template-columns: 1fr; }
  .screenshot-grid { grid-template-columns: 1fr; }
  .arch-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 2rem; }
  .nav-link span { display: none; }
}