/* ==============================
   SeekNode Docs — 全新视觉风格
   ============================== */

/* --- 主题变量 --- */
:root {
  --brand-hue: 252;
  --brand-sat: 94%;
  --brand-light: 67%;

  --c-brand: hsl(var(--brand-hue), var(--brand-sat), var(--brand-light));
  --c-brand-dark: hsl(var(--brand-hue), var(--brand-sat), 57%);
  --c-brand-light: hsl(var(--brand-hue), var(--brand-sat), 75%);
  --c-brand-subtle: hsl(var(--brand-hue), var(--brand-sat), 97%);
  --c-brand-glow: hsla(var(--brand-hue), var(--brand-sat), var(--brand-light), 0.35);

  --c-gradient-1: hsl(252, 94%, 67%);
  --c-gradient-2: hsl(224, 85%, 60%);
  --c-gradient-3: hsl(195, 85%, 50%);

  --c-bg: #ffffff;
  --c-bg-soft: #fafafc;
  --c-bg-mute: #f2f2f7;
  --c-bg-alt: #f0f0f5;
  --c-text: #1e1e2e;
  --c-text-2: #6b6b80;
  --c-text-3: #9a9ab0;
  --c-border: #e4e4ed;
  --c-border-soft: #efeff5;
  --c-border-subtle: #f5f5fa;

  --c-green: #10b981;
  --c-green-bg: #ecfdf5;
  --c-yellow: #f59e0b;
  --c-yellow-bg: #fffbeb;
  --c-red: #ef4444;
  --c-red-bg: #fef2f2;
  --c-blue: #3b82f6;
  --c-blue-bg: #eff6ff;

  --c-code-bg: #f4f4f8;
  --c-code-text: #3a4a5a;
  --c-code-border: #e8e8f0;
  --c-code-line: #e2e2ee;

  --sidebar-width: 272px;
  --nav-height: 60px;
  --content-width: 768px;
  --content-max-width: 1152px;
  --code-font-size: 13.5px;

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', 'Consolas', monospace;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.08);
  --shadow-xl: 0 16px 48px rgba(0,0,0,0.1);
  --shadow-glow: 0 0 24px var(--c-brand-glow);
}

.dark {
  --c-brand: hsl(var(--brand-hue), 80%, 72%);
  --c-brand-dark: hsl(var(--brand-hue), 80%, 62%);
  --c-brand-light: hsl(var(--brand-hue), 80%, 82%);
  --c-brand-subtle: hsl(var(--brand-hue), 40%, 14%);
  --c-brand-glow: hsla(var(--brand-hue), 80%, 72%, 0.2);

  --c-gradient-1: hsl(252, 80%, 72%);
  --c-gradient-2: hsl(224, 75%, 65%);
  --c-gradient-3: hsl(195, 75%, 55%);

  --c-bg: #121216;
  --c-bg-soft: #18181d;
  --c-bg-mute: #22222a;
  --c-bg-alt: #1a1a20;
  --c-text: #e8e8ee;
  --c-text-2: #9696a8;
  --c-text-3: #6a6a80;
  --c-border: #2a2a34;
  --c-border-soft: #22222c;
  --c-border-subtle: #1e1e28;

  --c-green: #34d399;
  --c-green-bg: rgba(16, 185, 129, 0.1);
  --c-yellow: #fbbf24;
  --c-yellow-bg: rgba(245, 158, 11, 0.1);
  --c-red: #f87171;
  --c-red-bg: rgba(239, 68, 68, 0.1);
  --c-blue: #60a5fa;
  --c-blue-bg: rgba(59, 130, 246, 0.1);

  --c-code-bg: #1c1c24;
  --c-code-text: #b8c8d8;
  --c-code-border: #282834;
  --c-code-line: #282834;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.35);
  --shadow-xl: 0 16px 48px rgba(0,0,0,0.4);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-family);
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.75;
  font-size: 16px;
  transition: color 0.3s, background 0.3s;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: var(--c-brand);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover { color: var(--c-brand-dark); }

::selection {
  background: var(--c-brand);
  color: #fff;
}

/* --- Navbar --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255,255,255,0.75);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--c-border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  z-index: 100;
  transition: background 0.3s, border-color 0.3s;
}

.dark .navbar {
  background: rgba(18,18,22,0.8);
  border-bottom-color: var(--c-border-soft);
}

.navbar-inner {
  display: flex;
  align-items: center;
  width: 100%;
  max-width: var(--content-max-width);
  margin: 0 auto;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--c-text);
  text-decoration: none;
  margin-right: 36px;
  flex-shrink: 0;
  letter-spacing: -0.02em;
  transition: opacity 0.2s;
}
.nav-logo:hover { opacity: 0.85; color: var(--c-text); }
.nav-logo img {
  height: 28px;
  width: auto;
  border-radius: 4px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1;
}

.nav-links a {
  color: var(--c-text-2);
  font-size: 14px;
  font-weight: 500;
  padding: 7px 14px;
  border-radius: 8px;
  transition: all 0.2s;
  white-space: nowrap;
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--c-text);
  background: var(--c-brand-subtle);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2.5px;
  border-radius: 2px;
  background: var(--c-brand);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--c-text-2);
  cursor: pointer;
  padding: 6px 12px;
  border-radius: 8px;
  transition: all 0.2s;
  border: 1px solid transparent;
  user-select: none;
}
.lang-switch:hover {
  background: var(--c-bg-mute);
  border-color: var(--c-border);
}
.lang-switch .separator { color: var(--c-border); }

.theme-toggle {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  cursor: pointer;
  color: var(--c-text-2);
  font-size: 17px;
  border: 1px solid transparent;
  background: transparent;
  transition: all 0.2s;
}
.theme-toggle:hover {
  background: var(--c-bg-mute);
  border-color: var(--c-border);
  color: var(--c-text);
}

.social-link {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  color: var(--c-text-2);
  font-size: 17px;
  transition: all 0.2s;
  border: 1px solid transparent;
}
.social-link:hover {
  background: var(--c-bg-mute);
  border-color: var(--c-border);
  color: var(--c-text);
}

.menu-btn {
  display: none;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  cursor: pointer;
  color: var(--c-text-2);
  font-size: 20px;
  border: 1px solid transparent;
  background: transparent;
  transition: all 0.2s;
}
.menu-btn:hover {
  background: var(--c-bg-mute);
  border-color: var(--c-border);
}

/* --- Layout --- */
.layout {
  display: flex;
  min-height: 100vh;
  padding-top: var(--nav-height);
}

/* --- Sidebar --- */
.sidebar {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--c-bg);
  border-right: 1px solid var(--c-border-soft);
  overflow-y: auto;
  padding: 28px 16px 40px;
  transition: background 0.3s, border-color 0.3s, transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 90;
  scrollbar-width: thin;
  scrollbar-color: transparent transparent;
}
.sidebar:hover { scrollbar-color: var(--c-border) transparent; }

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb {
  background: transparent;
  border-radius: 4px;
}
.sidebar:hover::-webkit-scrollbar-thumb { background: var(--c-border); }

.sidebar-group {
  margin-bottom: 24px;
}

.sidebar-group-title {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--c-text-3);
  padding: 0 12px;
  margin-bottom: 10px;
}

.sidebar-item {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  font-weight: 500;
  color: var(--c-text-2);
  border-radius: 8px;
  transition: all 0.2s;
  line-height: 1.5;
  position: relative;
}
.sidebar-item:hover {
  color: var(--c-text);
  background: var(--c-bg-mute);
}
.sidebar-item.active {
  color: var(--c-brand);
  background: var(--c-brand-subtle);
  font-weight: 600;
}

/* --- Content --- */
.content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: 48px 64px 80px;
  max-width: var(--content-max-width);
}

.content-inner {
  max-width: var(--content-width);
  margin: 0 auto;
}

/* Home page: no sidebar */
.home-layout .content {
  margin-left: 0;
  padding: 0;
  max-width: 100%;
}

/* --- Typography --- */
h1 {
  font-size: 2.4rem;
  font-weight: 750;
  line-height: 1.25;
  margin-bottom: 1rem;
  letter-spacing: -0.03em;
  color: var(--c-text);
}

h2 {
  font-size: 1.55rem;
  font-weight: 650;
  line-height: 1.35;
  margin: 2.8rem 0 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--c-border-soft);
  letter-spacing: -0.015em;
  color: var(--c-text);
}

h3 {
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.5;
  margin: 2.2rem 0 0.6rem;
  color: var(--c-text);
}

h4 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 1.6rem 0 0.5rem;
  color: var(--c-text);
}

p {
  margin-bottom: 1rem;
  color: var(--c-text);
}

strong { font-weight: 600; }

ul, ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}
li { margin-bottom: 0.35rem; }

hr {
  border: none;
  border-top: 1px solid var(--c-border-soft);
  margin: 1.5rem 0;
}

/* --- Hero Section --- */
.hero {
  text-align: center;
  padding: 90px 24px 50px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(ellipse, var(--c-brand-subtle) 0%, transparent 70%);
  pointer-events: none;
}

.hero-logo { margin-bottom: 24px; position: relative; }
.hero-logo img {
  height: 72px;
  width: auto;
  filter: drop-shadow(0 4px 20px var(--c-brand-glow));
}

.hero h1 {
  font-size: 3.2rem;
  max-width: 720px;
  margin: 0 auto 1rem;
  position: relative;
  background: linear-gradient(135deg, var(--c-gradient-1), var(--c-gradient-2), var(--c-gradient-3));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.dark .hero h1 {
  background: linear-gradient(135deg, hsl(252, 80%, 72%), hsl(224, 75%, 65%), hsl(195, 75%, 55%));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.2rem;
  color: var(--c-text-2);
  max-width: 560px;
  margin: 0 auto 2.2rem;
  position: relative;
  line-height: 1.7;
}

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

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 28px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  border: 1.5px solid transparent;
  letter-spacing: 0.01em;
}

.btn-primary {
  background: linear-gradient(135deg, var(--c-gradient-1), var(--c-gradient-2));
  color: #fff;
  box-shadow: 0 4px 16px var(--c-brand-glow);
  border: none;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px var(--c-brand-glow);
  color: #fff;
}
.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px var(--c-brand-glow);
}

.btn-outline {
  background: transparent;
  color: var(--c-brand);
  border-color: var(--c-brand);
}
.btn-outline:hover {
  background: var(--c-brand-subtle);
  transform: translateY(-1px);
}

.btn-ghost {
  background: var(--c-bg-mute);
  color: var(--c-text-2);
  border-color: var(--c-border);
}
.btn-ghost:hover {
  border-color: var(--c-brand);
  color: var(--c-brand);
  background: var(--c-brand-subtle);
  transform: translateY(-1px);
}

/* --- Features Grid --- */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding: 50px 24px 70px;
  max-width: 1040px;
  margin: 0 auto;
}

.feature-card {
  background: var(--c-bg-soft);
  border: 1px solid var(--c-border-soft);
  border-radius: 16px;
  padding: 28px 24px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-gradient-1), var(--c-gradient-3));
  opacity: 0;
  transition: opacity 0.3s;
}

.feature-card:hover {
  border-color: var(--c-brand);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}
.feature-card:hover::before { opacity: 1; }

.feature-icon {
  font-size: 30px;
  margin-bottom: 14px;
  display: block;
  line-height: 1;
}

.feature-card h3 {
  font-size: 1rem;
  font-weight: 650;
  margin: 0 0 8px;
  border: none;
  padding: 0;
}

.feature-card p {
  font-size: 14px;
  color: var(--c-text-2);
  margin: 0;
  line-height: 1.65;
}

/* --- Code Section --- */
.code-section {
  padding: 40px 24px 70px;
  max-width: 820px;
  margin: 0 auto;
  text-align: center;
}

.code-section h2 {
  border: none;
  padding: 0;
  margin-bottom: 1.5rem;
  font-size: 1.6rem;
}

.code-block {
  background: var(--c-code-bg);
  border-radius: 12px;
  padding: 20px 24px;
  text-align: left;
  overflow-x: auto;
  margin-bottom: 1.5rem;
  border: 1px solid var(--c-code-border);
  position: relative;
  line-height: 1.65;
}

.code-block .lang-tag {
  position: absolute;
  top: 10px;
  right: 14px;
  font-size: 10.5px;
  color: var(--c-text-3);
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  background: var(--c-bg-soft);
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid var(--c-border);
}

.code-block code {
  font-family: var(--font-mono);
  font-size: var(--code-font-size);
  line-height: 1.7;
  color: var(--c-code-text);
  white-space: pre;
}

.code-links {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--c-border-soft);
  padding: 28px 24px;
  text-align: center;
  font-size: 13px;
  color: var(--c-text-3);
  line-height: 1.8;
}
.footer a {
  color: var(--c-text-2);
  font-size: 13px;
}
.footer a:hover { color: var(--c-brand); }
.footer .sep {
  color: var(--c-border);
  margin: 0 8px;
}

/* --- Page Content --- */
.content-header { margin-bottom: 2rem; }
.content-header h1 + p {
  font-size: 1.1rem;
  color: var(--c-text-2);
  margin-top: -0.25rem;
}

/* --- Page Nav --- */
.page-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--c-border-soft);
  gap: 12px;
}

.page-nav a {
  display: flex;
  flex-direction: column;
  padding: 14px 20px;
  border-radius: 12px;
  border: 1px solid var(--c-border-soft);
  transition: all 0.25s;
  max-width: 48%;
  flex: 1;
  background: var(--c-bg-soft);
}
.page-nav a:hover {
  border-color: var(--c-brand);
  box-shadow: var(--shadow-sm);
}

.page-nav .nav-label {
  font-size: 12px;
  color: var(--c-text-3);
  margin-bottom: 3px;
  font-weight: 500;
}
.page-nav .nav-title {
  font-size: 14px;
  font-weight: 650;
  color: var(--c-text);
}
.page-nav .nav-prev { text-align: left; }
.page-nav .nav-next { text-align: right; margin-left: auto; }

/* --- Tables --- */
table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 1rem 0 1.5rem;
  font-size: 14px;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--c-border-soft);
}

thead th {
  background: var(--c-bg-mute);
  font-weight: 600;
  text-align: left;
  padding: 11px 16px;
  font-size: 12px;
  color: var(--c-text-2);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--c-border);
}

tbody td {
  padding: 11px 16px;
  border-bottom: 1px solid var(--c-border-subtle);
  vertical-align: top;
}
tbody tr:last-child td { border-bottom: none; }

tbody tr:hover { background: var(--c-bg-soft); }

/* --- Custom Blocks --- */
.custom-block {
  border-radius: 12px;
  padding: 18px 22px;
  margin: 1.2rem 0 1.5rem;
  font-size: 14px;
  line-height: 1.65;
  border: 1px solid transparent;
}

.custom-block.info {
  background: var(--c-blue-bg);
  border-color: hsl(217, 80%, 90%);
  border-left: 4px solid var(--c-blue);
}
.dark .custom-block.info {
  border-color: hsla(217, 80%, 50%, 0.2);
}
.custom-block.info::before {
  content: "ℹ️ INFO";
  display: block;
  font-weight: 700;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--c-blue);
  margin-bottom: 6px;
}

.custom-block.warning {
  background: var(--c-yellow-bg);
  border-color: hsl(38, 92%, 88%);
  border-left: 4px solid var(--c-yellow);
}
.dark .custom-block.warning {
  border-color: hsla(38, 92%, 50%, 0.2);
}
.custom-block.warning::before {
  content: "⚠️ WARNING";
  display: block;
  font-weight: 700;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--c-yellow);
  margin-bottom: 6px;
}

.custom-block.danger {
  background: var(--c-red-bg);
  border-color: hsl(0, 80%, 90%);
  border-left: 4px solid var(--c-red);
}
.dark .custom-block.danger {
  border-color: hsla(0, 80%, 50%, 0.2);
}
.custom-block.danger::before {
  content: "🚫 DANGER";
  display: block;
  font-weight: 700;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--c-red);
  margin-bottom: 6px;
}

.custom-block.tip {
  background: var(--c-green-bg);
  border-color: hsl(152, 76%, 88%);
  border-left: 4px solid var(--c-green);
}
.dark .custom-block.tip {
  border-color: hsla(152, 76%, 50%, 0.2);
}
.custom-block.tip::before {
  content: "💡 TIP";
  display: block;
  font-weight: 700;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--c-green);
  margin-bottom: 6px;
}

/* --- Inline code --- */
:not(pre) > code {
  background: var(--c-code-bg);
  color: var(--c-brand-dark);
  padding: 3px 8px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.88em;
  font-weight: 500;
  border: 1px solid var(--c-code-border);
}

/* ==============================
   Search Modal
   ============================== */

.search-trigger {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  border-radius: 8px;
  border: 1px solid var(--c-border);
  background: var(--c-bg-soft);
  color: var(--c-text-2);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-family);
  min-width: 120px;
}
.search-trigger:hover {
  border-color: var(--c-brand);
  background: var(--c-brand-subtle);
  color: var(--c-text);
}
.search-trigger .search-trigger-key {
  margin-left: auto;
  font-size: 11px;
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--c-bg-mute);
  border: 1px solid var(--c-border);
  color: var(--c-text-3);
  font-family: var(--font-mono);
}

.search-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 999;
}
.search-modal.open {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 10vh;
}

.search-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(4px);
}

.search-modal-content {
  position: relative;
  width: 100%;
  max-width: 640px;
  max-height: 70vh;
  background: var(--c-bg);
  border-radius: 16px;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--c-border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: searchSlideIn 0.2s ease-out;
}

@keyframes searchSlideIn {
  from { opacity: 0; transform: translateY(-20px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.search-modal-header {
  display: flex;
  align-items: center;
  padding: 14px 16px;
  border-bottom: 1px solid var(--c-border-soft);
  gap: 12px;
  background: var(--c-bg);
}

.search-modal-header .search-icon {
  flex-shrink: 0;
  color: var(--c-text-3);
}

.search-input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  font-size: 16px;
  font-family: var(--font-family);
  color: var(--c-text);
  line-height: 1.5;
}
.search-input::placeholder {
  color: var(--c-text-3);
}

.search-close-btn {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--c-text-2);
  font-size: 16px;
  cursor: pointer;
  transition: all 0.15s;
}
.search-close-btn:hover {
  background: var(--c-bg-mute);
  color: var(--c-text);
}

.search-results {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
  max-height: 50vh;
}
.search-results::-webkit-scrollbar { width: 6px; }
.search-results::-webkit-scrollbar-thumb { background: var(--c-border); border-radius: 3px; }

.search-result-item {
  display: block;
  padding: 10px 14px;
  border-radius: 10px;
  text-decoration: none;
  color: inherit;
  transition: background 0.15s;
  margin-bottom: 2px;
  cursor: pointer;
}
.search-result-item:hover,
.search-result-item.active {
  background: var(--c-brand-subtle);
}
.search-result-item.active {
  background: var(--c-brand-subtle);
}

.result-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: 2px;
  line-height: 1.4;
}
.result-title mark {
  background: var(--c-brand);
  color: #fff;
  border-radius: 3px;
  padding: 0 3px;
}

.result-desc {
  font-size: 13px;
  color: var(--c-text-2);
  line-height: 1.5;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.result-desc mark {
  background: var(--c-brand-bg);
  color: var(--c-brand-dark);
  border-radius: 3px;
  padding: 0 2px;
  font-weight: 500;
}

.search-empty {
  padding: 40px 20px;
  text-align: center;
  color: var(--c-text-3);
  font-size: 14px;
}

.search-footer {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 16px;
  border-top: 1px solid var(--c-border-soft);
  font-size: 12px;
  color: var(--c-text-3);
  background: var(--c-bg-soft);
}
.search-footer kbd {
  display: inline-block;
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-text-2);
  margin: 0 2px;
}

/* --- Back to top --- */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--c-gradient-1), var(--c-gradient-2));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  cursor: pointer;
  border: none;
  box-shadow: 0 4px 16px var(--c-brand-glow);
  opacity: 0;
  transform: translateY(20px) scale(0.9);
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 200;
}
.back-to-top.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}
.back-to-top:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 8px 24px var(--c-brand-glow);
}

/* --- Sidebar overlay --- */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.3);
  z-index: 85;
  opacity: 0;
  transition: opacity 0.3s;
}
.sidebar-overlay.open { display: block; opacity: 1; }

/* --- Responsive --- */
@media (max-width: 1024px) {
  .features {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }
  .content {
    padding: 36px 36px 64px;
  }
}

@media (max-width: 768px) {
  .nav-links { display: none; }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--c-bg);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--c-border);
    padding: 12px;
    gap: 2px;
    box-shadow: var(--shadow-lg);
    z-index: 89;
  }

  .nav-links a.active::after { display: none; }

  .menu-btn { display: flex; }

  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .sidebar-overlay.open { display: block; opacity: 1; }

  .content {
    margin-left: 0;
    padding: 28px 20px 48px;
  }

  .hero { padding: 60px 20px 40px; }
  .hero h1 { font-size: 2.2rem; }
  .hero p { font-size: 1rem; }

  .features {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 30px 20px 50px;
  }

  .page-nav { flex-direction: column; gap: 12px; }
  .page-nav a { max-width: 100%; }
  .page-nav .nav-next { margin-left: 0; }

  .navbar { padding: 0 16px; }
  .lang-switch span { display: none; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 1.7rem; }
  .hero-logo img { height: 56px; }

  .code-block {
    padding: 16px 16px;
    font-size: 12.5px;
  }
  .code-block code { font-size: 12px; }

  table { font-size: 12px; }
  thead th, tbody td { padding: 8px 10px; }

  .feature-card { padding: 22px 18px; }
  .btn { padding: 10px 20px; font-size: 13px; }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    font-size: 18px;
  }
}