/* ==========================================================================
   AXION Labs — Design System
   Dark-first, light-mode toggleable. Accessible contrast, smooth motion.
   ========================================================================== */

/* ---------- Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Chakra+Petch:wght@400;500;600;700&family=Public+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;1,400&display=swap');

/* ---------- Theme tokens (Dark default) ---------- */
:root {
  --bg: #0e1016;
  --bg-elev: #151823;
  --card: #1a1e2b;
  --card-hover: #212637;
  --text: #e8ecf4;
  --text-muted: #9aa3b8;
  --text-faint: #6b7489;
  --accent: #5eead4;          /* teal — primary */
  --accent-strong: #2dd4bf;
  --accent-soft: rgba(94, 234, 212, 0.12);
  --accent2: #a78bfa;         /* violet — secondary */
  --accent2-soft: rgba(167, 139, 250, 0.12);
  --danger: #f87171;
  --warning: #fbbf24;
  --success: #34d399;
  --border: rgba(154, 163, 184, 0.14);
  --border-strong: rgba(154, 163, 184, 0.28);
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --radius: 14px;
  --radius-sm: 8px;
  --font-head: 'Chakra Petch', 'Segoe UI', sans-serif;
  --font-body: 'Public Sans', 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', ui-monospace, monospace;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --header-h: 64px;
  --maxw: 1180px;
}

/* Light theme overrides */
[data-theme="light"] {
  --bg: #f6f7fb;
  --bg-elev: #ffffff;
  --card: #ffffff;
  --card-hover: #f0f2f8;
  --text: #0f172a;
  --text-muted: #5b6478;
  --text-faint: #8a93a8;
  --accent: #0d9488;
  --accent-strong: #0f766e;
  --accent-soft: rgba(13, 148, 136, 0.10);
  --accent2: #7c3aed;
  --accent2-soft: rgba(124, 58, 237, 0.10);
  --border: rgba(15, 23, 42, 0.10);
  --border-strong: rgba(15, 23, 42, 0.22);
  --shadow: 0 8px 30px rgba(15, 23, 42, 0.08);
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.06);
}

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}
body::before {
  content: '';
  position: fixed; inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 20% -10%, var(--accent-soft), transparent 60%),
    radial-gradient(ellipse 60% 40% at 90% 0%, var(--accent2-soft), transparent 55%);
  pointer-events: none;
  z-index: 0;
}
img, video, audio { max-width: 100%; }
a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-strong); }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, select, textarea { font-family: inherit; font-size: inherit; color: inherit; }
::selection { background: var(--accent-soft); color: var(--text); }

/* Scrollbar */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 6px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-faint); }

/* ---------- Layout helpers ---------- */
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; position: relative; z-index: 1; }
.page-wrap { padding-top: calc(var(--header-h) + 32px); padding-bottom: 80px; min-height: 100vh; }

/* ---------- Header ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--header-h);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  transition: background var(--transition);
}
.header-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 24px;
  height: 100%; display: flex; align-items: center; gap: 16px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-head); font-weight: 700; font-size: 1.15rem;
  letter-spacing: 0.04em; color: var(--text); flex-shrink: 0;
}
.brand-mark {
  width: 32px; height: 32px; border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  display: grid; place-items: center; color: #0b0e14;
  font-weight: 700; font-size: 0.9rem; flex-shrink: 0;
  box-shadow: 0 0 18px var(--accent-soft);
}
.brand small { color: var(--text-faint); font-weight: 500; font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase; }

.header-spacer { flex: 1; }

/* Search bar */
.search-wrap {
  position: relative; flex: 1; max-width: 460px; min-width: 140px;
}
.search-input {
  width: 100%; height: 40px; padding: 0 14px 0 40px;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 10px; font-size: 0.9rem;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}
.search-input:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.search-icon {
  position: absolute; left: 12px; top: 50%; transform: translateY(-50%);
  color: var(--text-faint); pointer-events: none;
}
.search-results {
  position: absolute; top: calc(100% + 8px); left: 0; right: 0;
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); box-shadow: var(--shadow);
  max-height: 420px; overflow-y: auto; z-index: 200;
  opacity: 0; visibility: hidden; transform: translateY(-6px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
}
.search-results.open { opacity: 1; visibility: visible; transform: translateY(0); }
.search-result-item {
  display: block; padding: 12px 16px; border-bottom: 1px solid var(--border);
  color: var(--text); cursor: pointer; transition: background var(--transition);
}
.search-result-item:last-child { border-bottom: none; }
.search-result-item:hover { background: var(--card-hover); }
.search-result-item .sr-title { font-weight: 600; font-size: 0.92rem; display: flex; align-items: center; gap: 8px; }
.search-result-item .sr-meta { font-size: 0.78rem; color: var(--text-faint); margin-top: 2px; }
.search-result-item .sr-excerpt { font-size: 0.8rem; color: var(--text-muted); margin-top: 4px; line-height: 1.45; }
.search-empty { padding: 20px; text-align: center; color: var(--text-faint); font-size: 0.88rem; }
mark { background: var(--accent-soft); color: var(--accent); border-radius: 3px; padding: 0 2px; }

/* Icon buttons */
.icon-btn {
  width: 40px; height: 40px; border-radius: 10px;
  display: grid; place-items: center; flex-shrink: 0;
  color: var(--text-muted); border: 1px solid transparent;
  transition: all var(--transition); position: relative;
}
.icon-btn:hover { background: var(--card); color: var(--text); border-color: var(--border); }
.icon-btn svg { width: 20px; height: 20px; }

/* Hamburger */
.hamburger { display: flex; flex-direction: column; gap: 5px; align-items: center; justify-content: center; }
.hamburger span {
  display: block; width: 20px; height: 2px; background: currentColor; border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Slide-in nav drawer ---------- */
.nav-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.5);
  opacity: 0; visibility: hidden; transition: opacity var(--transition), visibility var(--transition);
  z-index: 150; backdrop-filter: blur(2px);
}
.nav-overlay.open { opacity: 1; visibility: visible; }
.nav-drawer {
  position: fixed; top: 0; right: 0; bottom: 0;
  width: min(360px, 88vw); background: var(--bg-elev);
  border-left: 1px solid var(--border); z-index: 160;
  transform: translateX(100%); transition: transform 0.32s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex; flex-direction: column;
}
.nav-drawer.open { transform: translateX(0); }
.nav-drawer-header {
  padding: 20px 24px; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
}
.nav-drawer-header h3 { font-family: var(--font-head); font-size: 1rem; letter-spacing: 0.06em; text-transform: uppercase; }
.nav-drawer-body { flex: 1; overflow-y: auto; padding: 16px 0; }
.nav-section-label {
  padding: 12px 24px 6px; font-size: 0.72rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--text-faint); font-weight: 600;
}
.nav-topic-link {
  display: flex; align-items: center; gap: 12px;
  padding: 11px 24px; color: var(--text); font-size: 0.92rem;
  transition: background var(--transition), padding-left var(--transition);
  border-left: 3px solid transparent;
}
.nav-topic-link:hover { background: var(--card); padding-left: 30px; border-left-color: var(--accent); color: var(--text); }
.nav-topic-link .nt-icon {
  width: 30px; height: 30px; border-radius: 8px; flex-shrink: 0;
  background: var(--accent-soft); color: var(--accent);
  display: grid; place-items: center; font-size: 0.75rem; font-weight: 700;
  font-family: var(--font-head);
}
.nav-topic-link .nt-meta { font-size: 0.75rem; color: var(--text-faint); }
.nav-drawer-footer { padding: 16px 24px; border-top: 1px solid var(--border); font-size: 0.78rem; color: var(--text-faint); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 20px; border-radius: 10px; font-weight: 600; font-size: 0.9rem;
  transition: all var(--transition); border: 1px solid transparent;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent); color: #0b0e14;
  box-shadow: 0 4px 14px var(--accent-soft);
}
.btn-primary:hover { background: var(--accent-strong); transform: translateY(-1px); color: #0b0e14; }
.btn-secondary {
  background: var(--card); border-color: var(--border); color: var(--text);
}
.btn-secondary:hover { background: var(--card-hover); border-color: var(--border-strong); }
.btn-ghost { color: var(--text-muted); }
.btn-ghost:hover { color: var(--text); background: var(--card); }
.btn-danger { background: transparent; border-color: var(--danger); color: var(--danger); }
.btn svg { width: 16px; height: 16px; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none !important; }

/* ---------- Hero (home) ---------- */
.hero { padding: 40px 0 32px; text-align: center; }
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent);
  font-size: 0.78rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase;
  margin-bottom: 20px; border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
}
.hero h1 {
  font-family: var(--font-head); font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 700; line-height: 1.12; letter-spacing: -0.01em; margin-bottom: 16px;
}
.hero h1 .grad {
  background: linear-gradient(120deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p { max-width: 640px; margin: 0 auto 28px; color: var(--text-muted); font-size: 1.05rem; }
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* Stats strip */
.stats-strip {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px; margin: 40px 0;
}
.stat-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; text-align: center; transition: transform var(--transition), border-color var(--transition);
}
.stat-card:hover { transform: translateY(-3px); border-color: var(--accent); }
.stat-num { font-family: var(--font-head); font-size: 1.9rem; font-weight: 700; color: var(--accent); }
.stat-label { font-size: 0.8rem; color: var(--text-muted); margin-top: 4px; text-transform: uppercase; letter-spacing: 0.08em; }

/* ---------- Section headings ---------- */
.section { margin-top: 56px; }
.section-head { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 24px; gap: 16px; flex-wrap: wrap; }
.section-head h2 { font-family: var(--font-head); font-size: 1.5rem; font-weight: 700; letter-spacing: -0.01em; }
.section-head .sub { color: var(--text-muted); font-size: 0.9rem; margin-top: 4px; }
.section-head .view-all { font-size: 0.85rem; font-weight: 600; }

/* ---------- Topic cards grid ---------- */
.topics-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.topic-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; display: flex; flex-direction: column; gap: 12px;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  position: relative; overflow: hidden; cursor: pointer;
}
.topic-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  opacity: 0; transition: opacity var(--transition);
}
.topic-card:hover { transform: translateY(-4px); border-color: var(--accent); box-shadow: var(--shadow); }
.topic-card:hover::before { opacity: 1; }
.tc-top { display: flex; align-items: center; justify-content: space-between; }
.tc-badge {
  width: 42px; height: 42px; border-radius: 11px;
  background: linear-gradient(135deg, var(--accent-soft), var(--accent2-soft));
  color: var(--accent); display: grid; place-items: center;
  font-family: var(--font-head); font-weight: 700; font-size: 0.95rem;
  border: 1px solid var(--border);
}
.tc-type {
  font-size: 0.7rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--text-faint); padding: 4px 10px; border-radius: 999px;
  background: var(--bg); border: 1px solid var(--border);
}
.topic-card h3 { font-family: var(--font-head); font-size: 1.15rem; font-weight: 600; line-height: 1.3; }
.topic-card p { color: var(--text-muted); font-size: 0.88rem; flex: 1; }
.tc-foot { display: flex; align-items: center; justify-content: space-between; padding-top: 12px; border-top: 1px solid var(--border); font-size: 0.78rem; color: var(--text-faint); }
.tc-langs { display: flex; gap: 4px; }
.tc-lang-pill {
  padding: 2px 8px; border-radius: 5px; background: var(--bg);
  border: 1px solid var(--border); font-size: 0.7rem; font-weight: 600;
}

/* ---------- Topic page (markdown render) ---------- */
.topic-layout { display: grid; grid-template-columns: 1fr; gap: 32px; }
@media (min-width: 1024px) {
  .topic-layout { grid-template-columns: minmax(0, 1fr) 300px; }
}
.topic-content {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 36px 40px; min-width: 0;
}
@media (max-width: 640px) { .topic-content { padding: 24px 20px; } }
.topic-header { margin-bottom: 28px; padding-bottom: 24px; border-bottom: 1px solid var(--border); }
.topic-header .tc-eyebrow {
  font-size: 0.75rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--accent); font-weight: 700; margin-bottom: 10px;
}
.topic-header h1 { font-family: var(--font-head); font-size: clamp(1.6rem, 3.5vw, 2.4rem); font-weight: 700; line-height: 1.2; margin-bottom: 12px; }
.topic-header .topic-desc { color: var(--text-muted); font-size: 1rem; }
.topic-meta-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.meta-pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 12px; border-radius: 999px; font-size: 0.75rem; font-weight: 600;
  background: var(--bg); border: 1px solid var(--border); color: var(--text-muted);
}
.meta-pill.accent { background: var(--accent-soft); color: var(--accent); border-color: transparent; }

/* Markdown typography */
.md-body { color: var(--text); font-size: 0.98rem; line-height: 1.75; }
.md-body > * + * { margin-top: 1em; }
.md-body h1, .md-body h2, .md-body h3, .md-body h4 {
  font-family: var(--font-head); font-weight: 700; line-height: 1.3; margin-top: 1.8em;
}
.md-body h1 { font-size: 1.7rem; padding-bottom: 0.4em; border-bottom: 1px solid var(--border); }
.md-body h2 { font-size: 1.4rem; }
.md-body h3 { font-size: 1.15rem; }
.md-body ul, .md-body ol { padding-left: 1.5em; }
.md-body li { margin: 0.35em 0; }
.md-body blockquote {
  border-left: 3px solid var(--accent); padding: 8px 20px; margin: 1.2em 0;
  background: var(--accent-soft); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-muted); font-style: italic;
}
.md-body code {
  font-family: var(--font-mono); font-size: 0.85em;
  background: var(--bg); padding: 2px 6px; border-radius: 5px;
  border: 1px solid var(--border);
}
.md-body pre {
  background: #0b0e14; border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 18px; overflow-x: auto; margin: 1.2em 0; position: relative;
}
[data-theme="light"] .md-body pre { background: #1e293b; }
.md-body pre code { background: none; border: none; padding: 0; color: #e2e8f0; font-size: 0.85rem; line-height: 1.6; }
.md-body table { width: 100%; border-collapse: collapse; margin: 1.2em 0; font-size: 0.9rem; }
.md-body th, .md-body td { padding: 10px 14px; border: 1px solid var(--border); text-align: left; }
.md-body th { background: var(--bg); font-weight: 600; font-family: var(--font-head); }
.md-body hr { border: none; border-top: 1px solid var(--border); margin: 2em 0; }
.md-body img { border-radius: var(--radius-sm); border: 1px solid var(--border); }
.md-body a { text-decoration: underline; text-underline-offset: 3px; }

/* ---------- Asset cards (from JSON metadata) ---------- */
.asset-card {
  margin: 1.6em 0; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg-elev); overflow: hidden; transition: border-color var(--transition);
}
.asset-card:hover { border-color: var(--border-strong); }
.asset-header {
  display: flex; align-items: center; gap: 12px; padding: 14px 18px;
  border-bottom: 1px solid var(--border); flex-wrap: wrap;
}
.asset-icon {
  width: 38px; height: 38px; border-radius: 10px; flex-shrink: 0;
  display: grid; place-items: center; font-weight: 700; font-size: 0.7rem;
  font-family: var(--font-head); letter-spacing: 0.04em; text-transform: uppercase;
}
.asset-icon.image { background: var(--accent-soft); color: var(--accent); }
.asset-icon.video { background: var(--accent2-soft); color: var(--accent2); }
.asset-icon.audio { background: rgba(251, 191, 36, 0.12); color: var(--warning); }
.asset-icon.doc, .asset-icon.code { background: rgba(96, 165, 250, 0.12); color: #60a5fa; }
.asset-title { font-weight: 600; font-size: 0.95rem; flex: 1; min-width: 140px; }
.asset-title small { display: block; color: var(--text-faint); font-weight: 400; font-size: 0.75rem; margin-top: 2px; }
.asset-body { padding: 16px 18px; }
.asset-desc { color: var(--text-muted); font-size: 0.88rem; margin-bottom: 12px; }
.asset-meta-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 8px; margin-bottom: 14px;
}
.asset-meta-item {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 8px 12px;
}
.asset-meta-item .k { font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-faint); font-weight: 600; }
.asset-meta-item .v { font-size: 0.85rem; font-weight: 600; margin-top: 2px; word-break: break-all; }
.asset-media { border-radius: var(--radius-sm); overflow: hidden; margin-bottom: 12px; background: #000; }
.asset-media img, .asset-media video { width: 100%; display: block; }
.asset-actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* Censored placeholder */
.censored {
  position: relative; border-radius: var(--radius-sm); overflow: hidden;
  background: repeating-linear-gradient(45deg, var(--card), var(--card) 10px, var(--bg-elev) 10px, var(--bg-elev) 20px);
  display: grid; place-items: center; min-height: 180px; margin-bottom: 12px;
}
.censored::after {
  content: ''; position: absolute; inset: 0;
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
}
.censored-label {
  position: relative; z-index: 2; display: flex; flex-direction: column; align-items: center; gap: 8px;
  color: var(--text-muted); font-size: 0.85rem; font-weight: 600; text-align: center; padding: 20px;
}
.censored-label svg { width: 28px; height: 28px; opacity: 0.6; }

/* ---------- Sidebar (topic page) ---------- */
.topic-sidebar { display: flex; flex-direction: column; gap: 20px; }
.side-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px;
}
.side-card h4 {
  font-family: var(--font-head); font-size: 0.78rem; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--text-faint); margin-bottom: 14px; font-weight: 700;
}
.lang-switch-list { display: flex; flex-direction: column; gap: 6px; }
.lang-option {
  display: flex; align-items: center; justify-content: space-between;
  padding: 9px 12px; border-radius: var(--radius-sm); font-size: 0.88rem;
  cursor: pointer; transition: background var(--transition); border: 1px solid transparent;
}
.lang-option:hover { background: var(--card-hover); }
.lang-option.active { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); font-weight: 600; }
.lang-option.missing { opacity: 0.4; cursor: not-allowed; font-style: italic; }
.lang-option .lo-code { font-size: 0.7rem; color: var(--text-faint); font-family: var(--font-mono); }
.lang-option.active .lo-code { color: var(--accent); }

/* ---------- Settings page ---------- */
.settings-wrap { max-width: 760px; margin: 0 auto; }
.settings-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; margin-bottom: 20px;
}
.settings-card h3 { font-family: var(--font-head); font-size: 1.1rem; margin-bottom: 6px; display: flex; align-items: center; gap: 10px; }
.settings-card h3 svg { width: 20px; height: 20px; color: var(--accent); }
.settings-card .sc-desc { color: var(--text-muted); font-size: 0.88rem; margin-bottom: 20px; }
.setting-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.setting-row:last-child { border-bottom: none; }
.setting-row .sr-label { font-weight: 500; font-size: 0.92rem; }
.setting-row .sr-hint { font-size: 0.78rem; color: var(--text-faint); margin-top: 2px; }

/* Toggle switch */
.toggle { position: relative; width: 52px; height: 28px; flex-shrink: 0; }
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
  position: absolute; inset: 0; background: var(--bg); border: 1px solid var(--border-strong);
  border-radius: 999px; transition: background var(--transition); cursor: pointer;
}
.toggle-slider::before {
  content: ''; position: absolute; height: 20px; width: 20px; left: 3px; top: 3px;
  background: var(--text-muted); border-radius: 50%; transition: transform var(--transition), background var(--transition);
}
.toggle input:checked + .toggle-slider { background: var(--accent); border-color: var(--accent); }
.toggle input:checked + .toggle-slider::before { transform: translateX(24px); background: #0b0e14; }

/* Select */
.select-wrap { position: relative; }
.select-wrap select {
  appearance: none; -webkit-appearance: none;
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 9px 36px 9px 14px; font-size: 0.9rem; font-weight: 500; cursor: pointer;
  transition: border-color var(--transition); min-width: 180px;
}
.select-wrap select:focus { outline: none; border-color: var(--accent); }
.select-wrap::after {
  content: ''; position: absolute; right: 14px; top: 50%;
  border: 5px solid transparent; border-top-color: var(--text-muted);
  transform: translateY(-2px); pointer-events: none;
}

/* ---------- 404 ---------- */
.error-wrap { min-height: 70vh; display: grid; place-items: center; text-align: center; padding: 40px 20px; }
.error-code {
  font-family: var(--font-head); font-size: clamp(5rem, 18vw, 10rem); font-weight: 700; line-height: 1;
  background: linear-gradient(120deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.error-wrap h2 { font-family: var(--font-head); font-size: 1.6rem; margin: 12px 0 8px; }
.error-wrap p { color: var(--text-muted); margin-bottom: 28px; max-width: 420px; }

/* ---------- Modal (fullscreen view) ---------- */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.7); z-index: 300;
  display: none; align-items: center; justify-content: center; padding: 24px;
  backdrop-filter: blur(4px);
}
.modal-overlay.open { display: flex; }
.modal-box {
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius);
  width: 100%; max-width: 900px; max-height: 90vh; display: flex; flex-direction: column;
  box-shadow: var(--shadow); animation: modalIn 0.25s ease;
}
@keyframes modalIn { from { opacity: 0; transform: scale(0.96) translateY(10px); } to { opacity: 1; transform: none; } }
.modal-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px; border-bottom: 1px solid var(--border);
}
.modal-head h4 { font-family: var(--font-head); font-size: 0.95rem; }
.modal-body { flex: 1; overflow: auto; padding: 20px; }
.modal-body pre { white-space: pre-wrap; word-break: break-word; font-family: var(--font-mono); font-size: 0.85rem; line-height: 1.6; color: var(--text); }

/* ---------- Donation popup ---------- */
.donate-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.6); z-index: 400;
  display: none; align-items: center; justify-content: center; padding: 20px;
  backdrop-filter: blur(6px);
}
.donate-overlay.open { display: flex; animation: fadeIn 0.3s ease; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.donate-card {
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius);
  max-width: 440px; width: 100%; padding: 32px; text-align: center;
  box-shadow: var(--shadow); animation: popIn 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative; overflow: hidden;
}
@keyframes popIn { from { opacity: 0; transform: scale(0.85) translateY(20px); } to { opacity: 1; transform: none; } }
.donate-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
}
.donate-icon {
  width: 64px; height: 64px; margin: 0 auto 18px; border-radius: 50%;
  background: var(--accent-soft); display: grid; place-items: center; color: var(--accent);
}
.donate-icon svg { width: 30px; height: 30px; }
.donate-card h3 { font-family: var(--font-head); font-size: 1.3rem; margin-bottom: 10px; }
.donate-card p { color: var(--text-muted); font-size: 0.92rem; margin-bottom: 24px; }
.donate-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.donate-close { position: absolute; top: 14px; right: 14px; color: var(--text-faint); }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border); padding: 32px 0; margin-top: 64px;
  color: var(--text-faint); font-size: 0.82rem; position: relative; z-index: 1;
}
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.footer-links { display: flex; gap: 20px; }
.footer-links a { color: var(--text-faint); }
.footer-links a:hover { color: var(--accent); }

/* ---------- Toast ---------- */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--card); border: 1px solid var(--accent); color: var(--text);
  padding: 12px 22px; border-radius: 10px; box-shadow: var(--shadow);
  font-size: 0.88rem; z-index: 500; opacity: 0; visibility: hidden;
  transition: all var(--transition);
}
.toast.show { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }

/* ---------- Loading skeleton ---------- */
.skeleton {
  background: linear-gradient(90deg, var(--card) 25%, var(--card-hover) 50%, var(--card) 75%);
  background-size: 200% 100%; animation: shimmer 1.4s infinite;
  border-radius: var(--radius-sm);
}
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

/* ---------- Fade-in on load ---------- */
.fade-in { animation: fadeUp 0.5s ease both; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
.fade-in.d1 { animation-delay: 0.08s; }
.fade-in.d2 { animation-delay: 0.16s; }
.fade-in.d3 { animation-delay: 0.24s; }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .brand small { display: none; }
  .search-wrap { max-width: none; }
  .hero { padding: 20px 0 16px; }
  .topic-content { padding: 24px 18px; }
  .settings-card { padding: 20px; }
  .header-inner { gap: 10px; padding: 0 16px; }
  .container { padding: 0 16px; }
}
@media (max-width: 480px) {
  .brand span.brand-text { display: none; }
  .hero-actions .btn { width: 100%; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
}