:root {
  --bg: #0f1117;
  --bg-elevated: #181b24;
  --bg-card: #1e2230;
  --border: #2a3042;
  --text: #e8eaef;
  --text-muted: #9399ab;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --accent-soft: rgba(99, 102, 241, 0.12);
  --success: #10b981;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
  --font: "Segoe UI", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Cascadia Code", "Fira Code", Consolas, monospace;
  --max-width: 1080px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.18), transparent),
    radial-gradient(ellipse 60% 40% at 100% 0%, rgba(14, 165, 233, 0.08), transparent);
  pointer-events: none;
  z-index: -1;
}

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

a:hover {
  text-decoration: underline;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.container-narrow {
  max-width: 720px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 600;
  font-size: 1.05rem;
  text-decoration: none;
}

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

.logo-icon {
  display: flex;
  width: 28px;
  height: 28px;
  color: var(--accent);
}

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

.header-nav {
  display: flex;
  gap: 24px;
}

.header-nav a {
  color: var(--text-muted);
  font-size: 0.925rem;
  text-decoration: none;
}

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

/* Hero */
.hero {
  padding: 72px 0 48px;
  text-align: center;
}

.hero-badge {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-hover);
  font-size: 0.85rem;
  font-weight: 500;
  margin: 0 0 20px;
  border: 1px solid rgba(99, 102, 241, 0.25);
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
  line-height: 1.15;
}

.hero-subtitle {
  color: var(--text-muted);
  font-size: 1.125rem;
  max-width: 540px;
  margin: 0 auto 32px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

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

.btn-secondary {
  background: var(--bg-card);
  color: var(--text);
  border-color: var(--border);
}

.btn-secondary:hover {
  background: var(--bg-elevated);
  border-color: #3d4660;
  color: var(--text);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
}

/* Extensions section */
.extensions-section {
  padding: 24px 0 64px;
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 28px;
  gap: 16px;
  flex-wrap: wrap;
}

.section-head h2 {
  margin: 0;
  font-size: 1.5rem;
}

.section-head p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.925rem;
}

.extensions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

/* Extension card */
.ext-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.ext-card-link {
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  z-index: 0;
}

.ext-card-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.ext-card > *:not(.ext-card-link) {
  position: relative;
  z-index: 1;
}

.ext-card .ext-actions .btn,
.ext-card .ext-note,
.ext-card h3 a {
  position: relative;
  z-index: 2;
}

.ext-meta h3 a {
  color: inherit;
  text-decoration: none;
}

.ext-meta h3 a:hover {
  color: var(--accent-hover);
}

.ext-card:hover {
  border-color: #3d4660;
  box-shadow: var(--shadow);
}

.ext-card-header {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.ext-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  flex-shrink: 0;
  object-fit: cover;
}

.ext-meta h3 {
  margin: 0 0 4px;
  font-size: 1.125rem;
  font-weight: 600;
}

.ext-version {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--bg-elevated);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: var(--font-mono);
}

.ext-desc {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.925rem;
  line-height: 1.55;
  flex: 1;
}

.ext-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.ext-tag {
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-hover);
  border: 1px solid rgba(99, 102, 241, 0.2);
}

.ext-actions {
  display: flex;
  gap: 10px;
  margin-top: auto;
  padding-top: 4px;
}

.ext-actions .btn {
  flex: 1;
}

.ext-note {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 10px 12px;
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent);
  line-height: 1.5;
}

.ext-note summary {
  cursor: pointer;
  font-weight: 500;
  color: var(--text);
}

.ext-note[open] summary {
  margin-bottom: 6px;
}

/* Install preview */
.install-preview {
  padding: 0 0 80px;
}

.install-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}

.install-card h2 {
  margin: 0 0 20px;
  font-size: 1.25rem;
}

.install-steps {
  margin: 0 0 24px;
  padding-left: 1.25rem;
  color: var(--text-muted);
}

.install-steps li {
  margin-bottom: 8px;
}

.install-steps code {
  background: var(--bg-elevated);
  padding: 2px 7px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--accent-hover);
}

/* Guide page */
.page-main {
  padding: 48px 0 80px;
  flex: 1;
}

.page-main h1 {
  font-size: 2rem;
  margin: 0 0 12px;
}

.page-lead {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin: 0 0 40px;
  line-height: 1.7;
}

.guide-block {
  margin-bottom: 36px;
}

.guide-block h2 {
  font-size: 1.2rem;
  margin: 0 0 12px;
}

.guide-block p {
  color: var(--text-muted);
  margin: 0 0 12px;
}

.code-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent-hover);
  overflow-x: auto;
  margin: 12px 0;
}

.callout {
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.925rem;
  margin: 16px 0;
}

.callout-info {
  background: rgba(14, 165, 233, 0.1);
  border: 1px solid rgba(14, 165, 233, 0.25);
  color: var(--text-muted);
}

.callout strong {
  color: var(--text);
}

.faq-list {
  margin: 0;
}

.faq-list dt {
  font-weight: 600;
  color: var(--text);
  margin-top: 16px;
}

.faq-list dt:first-child {
  margin-top: 0;
}

.faq-list dd {
  margin: 6px 0 0;
  color: var(--text-muted);
}

.back-link {
  margin-top: 48px;
}

.back-link-top {
  margin: 0 0 24px;
}

.loading-text {
  color: var(--text-muted);
  text-align: center;
  padding: 48px 0;
}

/* Detail page */
.detail-hero {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  margin-bottom: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}

.detail-icon {
  width: 80px;
  height: 80px;
  border-radius: 18px;
  flex-shrink: 0;
}

.detail-hero-text h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  margin: 0 0 10px;
  letter-spacing: -0.02em;
}

.detail-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin: 0 0 16px;
  line-height: 1.6;
}

.detail-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.detail-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.detail-section {
  margin-bottom: 36px;
}

.detail-section h2 {
  font-size: 1.15rem;
  margin: 0 0 14px;
  color: var(--text);
}

.detail-overview {
  color: var(--text-muted);
  font-size: 1.02rem;
  line-height: 1.75;
  margin: 0;
}

.detail-list {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--text-muted);
}

.detail-list li {
  margin-bottom: 8px;
  line-height: 1.6;
}

ol.detail-list {
  padding-left: 1.4rem;
}

.shortcut-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.925rem;
}

.shortcut-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
}

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

.shortcut-table kbd {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 6px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text);
  white-space: nowrap;
}

.detail-not-found {
  text-align: center;
  padding: 64px 0;
}

.detail-not-found h1 {
  margin: 0 0 12px;
}

.detail-not-found p {
  color: var(--text-muted);
  margin: 0 0 24px;
}

/* Footer */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border);
  padding: 24px 0;
}

.site-footer p {
  margin: 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.site-footer a {
  color: var(--text-muted);
}

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

/* Error state */
.error-message {
  grid-column: 1 / -1;
  text-align: center;
  padding: 48px;
  color: var(--text-muted);
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px dashed var(--border);
}

/* Responsive */
@media (max-width: 600px) {
  .hero {
    padding: 48px 0 32px;
  }

  .ext-actions,
  .detail-actions {
    flex-direction: column;
  }

  .detail-hero {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .detail-meta {
    justify-content: center;
  }

  .install-card {
    padding: 24px 20px;
  }
}