/* ============ AI اليوم — Theme ============ */
:root {
  --bg: #0b0f17;
  --bg-alt: #0f1522;
  --card: #141c2b;
  --card-hover: #182236;
  --border: #1f2a3d;
  --text: #e8edf5;
  --text-dim: #93a0b4;
  --text-faint: #6b7891;
  --accent: #38bdf8;
  --accent-2: #818cf8;
  --accent-strong: #0ea5e9;
  --gradient: linear-gradient(135deg, #38bdf8, #818cf8);
  --danger: #f87171;
  --warning: #fbbf24;
  --success: #34d399;
  --tag-bg: rgba(56, 189, 248, 0.12);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --radius: 14px;
}

[data-theme="light"] {
  --bg: #f4f7fb;
  --bg-alt: #eaf0f7;
  --card: #ffffff;
  --card-hover: #f7fafd;
  --border: #dbe4ee;
  --text: #16202e;
  --text-dim: #4b5a6e;
  --text-faint: #7b8aa0;
  --tag-bg: rgba(14, 165, 233, 0.1);
  --shadow: 0 10px 30px rgba(30, 50, 80, 0.1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  font-family: "Tajawal", "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  transition: background 0.3s, color 0.3s;
}

code, pre { font-family: "IBM Plex Mono", Consolas, monospace; direction: ltr; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 20px; }

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

/* ============ Header ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.3rem;
  color: var(--text);
}

.logo:hover { text-decoration: none; }

.logo-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--gradient);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: 0.5px;
}

.logo-text .logo-dot { color: var(--accent); }

.main-nav {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
}

.main-nav::-webkit-scrollbar { display: none; }

.main-nav a {
  color: var(--text-dim);
  font-weight: 500;
  font-size: 0.92rem;
  padding: 8px 12px;
  border-radius: 8px;
  white-space: nowrap;
  transition: color 0.2s, background 0.2s;
}

.main-nav a:hover { color: var(--text); background: var(--tag-bg); text-decoration: none; }

.header-actions { display: flex; align-items: center; gap: 12px; }

.live-badge {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 0.8rem;
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 12px;
  white-space: nowrap;
}

.live-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.5); }
  50% { box-shadow: 0 0 0 6px rgba(52, 211, 153, 0); }
}

.theme-toggle, .nav-toggle {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 38px;
  height: 38px;
  font-size: 1.05rem;
  cursor: pointer;
  color: var(--text);
  transition: background 0.2s;
}

.theme-toggle:hover, .nav-toggle:hover { background: var(--card-hover); }

.nav-toggle { display: none; }

/* ============ Hero ============ */
.hero {
  padding: 56px 0 40px;
  background:
    radial-gradient(600px 300px at 85% -10%, rgba(56, 189, 248, 0.14), transparent),
    radial-gradient(500px 260px at 10% 110%, rgba(129, 140, 248, 0.12), transparent);
}

.hero-kicker {
  color: var(--accent);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.5px;
}

.hero-date {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  margin: 4px 0 28px;
}

.top-story {
  position: relative;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 34px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.top-story::before {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--gradient);
}

.top-story-tag {
  display: inline-block;
  background: var(--gradient);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 999px;
  margin-bottom: 14px;
}

.top-story-title {
  font-size: clamp(1.25rem, 3vw, 1.7rem);
  font-weight: 800;
  margin-bottom: 10px;
}

.top-story-summary {
  color: var(--text-dim);
  font-size: 1.02rem;
  max-width: 75ch;
  margin-bottom: 16px;
}

.top-story-link {
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.stat-value {
  font-size: 1.55rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.stat-label { color: var(--text-dim); font-size: 0.88rem; }

/* ============ Sections ============ */
.section { padding: 52px 0; }

.section-alt { background: var(--bg-alt); }

.section-head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 28px;
}

.section-title {
  font-size: 1.45rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-sub { color: var(--text-dim); font-size: 0.95rem; }

/* ============ Important ============ */
.important-list { display: grid; gap: 12px; }

.important-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: var(--card);
  border: 1px solid var(--border);
  border-inline-start: 4px solid var(--accent);
  border-radius: 10px;
  padding: 16px 20px;
}

.important-item.level-warning { border-inline-start-color: var(--warning); }
.important-item.level-critical { border-inline-start-color: var(--danger); }

.important-icon { font-size: 1.25rem; line-height: 1.5; }

.important-text { font-weight: 500; }

.important-text a { font-weight: 700; }

/* ============ News ============ */
.news-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.search-input {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 9px 16px;
  font-family: inherit;
  font-size: 0.92rem;
  min-width: 220px;
  transition: border-color 0.2s;
}

.search-input:focus { outline: none; border-color: var(--accent); }

.category-filters { display: flex; flex-wrap: wrap; gap: 8px; }

.filter-chip {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: 999px;
  padding: 6px 16px;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.filter-chip:hover { color: var(--text); border-color: var(--accent); }

.filter-chip.active {
  background: var(--gradient);
  border-color: transparent;
  color: #fff;
  font-weight: 700;
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 18px;
}

.news-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: transform 0.2s, background 0.2s, border-color 0.2s;
}

.news-card:hover {
  transform: translateY(-3px);
  background: var(--card-hover);
  border-color: var(--accent);
}

.news-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.news-category {
  background: var(--tag-bg);
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 700;
  padding: 3px 12px;
  border-radius: 999px;
}

.news-importance { color: var(--warning); font-size: 0.8rem; letter-spacing: 1px; }

.news-title { font-size: 1.05rem; font-weight: 700; line-height: 1.55; }

.news-summary { color: var(--text-dim); font-size: 0.92rem; flex: 1; }

.news-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border);
  padding-top: 12px;
  font-size: 0.82rem;
  color: var(--text-faint);
}

.news-source-link { font-weight: 700; }

.empty-state {
  text-align: center;
  color: var(--text-dim);
  padding: 40px 0;
  font-size: 1.05rem;
}

/* ============ Models ============ */
.models-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 18px;
}

.model-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.model-head { display: flex; align-items: center; gap: 12px; }

.model-org-avatar {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--gradient);
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 1rem;
  color: #fff;
  flex-shrink: 0;
}

.model-name { font-size: 1.08rem; font-weight: 800; direction: ltr; text-align: right; }

html[dir="ltr"] .model-name { text-align: left; }

html[dir="ltr"] .top-story-summary, html[dir="ltr"] .news-summary,
html[dir="ltr"] .model-highlights, html[dir="ltr"] .step-detail { text-align: left; }

.model-org { color: var(--text-dim); font-size: 0.84rem; }

.model-highlights { color: var(--text-dim); font-size: 0.92rem; flex: 1; }

.model-specs { display: flex; flex-wrap: wrap; gap: 8px; }

.spec-chip {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 0.78rem;
  padding: 3px 12px;
  border-radius: 999px;
}

.model-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border);
  padding-top: 12px;
  font-size: 0.82rem;
  color: var(--text-faint);
}

/* ============ MCP directory ============ */
.mcp-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

.mcp-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform 0.2s, border-color 0.2s;
}

.mcp-card:hover { transform: translateY(-2px); border-color: var(--accent); }

.mcp-head { display: flex; align-items: center; gap: 12px; }

.mcp-logo {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  object-fit: cover;
  flex-shrink: 0;
  background: var(--bg);
  border: 1px solid var(--border);
}

.mcp-logo-fallback { display: grid; place-items: center; font-size: 1.2rem; }

.mcp-names { display: flex; flex-direction: column; min-width: 0; }

.mcp-name {
  font-weight: 800;
  font-size: 0.98rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mcp-name-en {
  color: var(--text-faint);
  font-size: 0.78rem;
  direction: ltr;
  text-align: start;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mcp-desc {
  color: var(--text-dim);
  font-size: 0.88rem;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.mcp-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  border-top: 1px solid var(--border);
  padding-top: 10px;
  font-size: 0.78rem;
}

.mcp-views { color: var(--text-faint); }

.mcp-meta a { font-weight: 700; margin-inline-start: auto; }

.load-more-btn {
  display: block;
  margin: 24px auto 0;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 999px;
  padding: 10px 28px;
  font-family: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: border-color 0.2s;
}

.load-more-btn:hover { border-color: var(--accent); }

/* ============ Benchmarks ============ */
.bench-highlights {
  color: var(--text-dim);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 18px;
  margin-bottom: 18px;
}

.bench-table-wrap {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow-x: auto;
  box-shadow: var(--shadow);
}

.bench-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 520px;
}

.bench-table th {
  text-align: start;
  font-size: 0.82rem;
  color: var(--text-dim);
  font-weight: 700;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-alt);
}

.bench-table td {
  padding: 12px 18px;
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
}

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

.bench-table tbody tr:hover { background: var(--card-hover); }

.bench-table tbody tr:first-child .bench-rank { color: #facc15; }
.bench-table tbody tr:nth-child(2) .bench-rank { color: #cbd5e1; }
.bench-table tbody tr:nth-child(3) .bench-rank { color: #d97706; }

.bench-rank { font-weight: 800; font-size: 1.05rem; }

.bench-model { font-weight: 700; direction: ltr; text-align: start; font-family: "IBM Plex Mono", monospace; font-size: 0.88rem; }

.bench-org { color: var(--text-dim); font-size: 0.88rem; }

.bench-score {
  font-weight: 800;
  color: var(--accent);
  direction: ltr;
  text-align: start;
}

.bench-src { margin-top: 12px; color: var(--text-faint); font-size: 0.84rem; }

.bench-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.bench-links-label { color: var(--text-dim); font-size: 0.86rem; }

/* ============ AI Security ============ */
.security-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 18px;
}

.security-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-inline-start: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.security-card.severity-warning { border-inline-start-color: var(--warning); }
.security-card.severity-critical { border-inline-start-color: var(--danger); }

.security-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.security-type {
  color: var(--text-dim);
  font-size: 0.82rem;
  font-weight: 700;
}

.security-sev {
  font-size: 0.74rem;
  font-weight: 800;
  padding: 3px 12px;
  border-radius: 999px;
}

.security-sev.sev-info { background: rgba(56, 189, 248, 0.14); color: var(--accent); }
.security-sev.sev-warning { background: rgba(251, 191, 36, 0.14); color: var(--warning); }
.security-sev.sev-critical { background: rgba(248, 113, 113, 0.16); color: var(--danger); }

.security-title { font-size: 1.02rem; font-weight: 700; line-height: 1.55; }

.security-summary { color: var(--text-dim); font-size: 0.92rem; flex: 1; }

.security-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  border-top: 1px solid var(--border);
  padding-top: 12px;
  font-size: 0.8rem;
  color: var(--text-faint);
}

.security-meta a { font-weight: 700; }

/* ============ Accessibility / progress ============ */
.skip-link {
  position: absolute;
  inset-inline-start: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 10px 20px;
  border-radius: 0 0 10px 10px;
  font-weight: 700;
  z-index: 200;
}

.skip-link:focus { inset-inline-start: 12px; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

.reading-progress {
  position: fixed;
  top: 0;
  inset-inline-start: 0;
  height: 3px;
  width: 0;
  background: var(--gradient);
  z-index: 300;
  transition: width 0.1s linear;
}

.flash-highlight { animation: flashhl 2.5s ease; }

@keyframes flashhl {
  0%, 60% { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.25); }
  100% { box-shadow: none; }
}

/* ============ Quiz ============ */
.knowledge-quiz {
  margin-top: 18px;
  background: var(--bg);
  border: 1px dashed var(--border);
  border-radius: 10px;
  padding: 16px 18px;
}

.quiz-head { font-weight: 800; margin-bottom: 12px; color: var(--accent); }

.quiz-question { margin-bottom: 14px; }

.quiz-q { font-weight: 700; font-size: 0.95rem; margin-bottom: 8px; }

.quiz-options { display: grid; gap: 8px; }

.quiz-option {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 9px 14px;
  font-family: inherit;
  font-size: 0.9rem;
  text-align: start;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.quiz-option:hover:not(:disabled) { border-color: var(--accent); }

.quiz-option:disabled { cursor: default; opacity: 0.85; }

.quiz-option.correct {
  border-color: var(--success);
  background: rgba(52, 211, 153, 0.14);
  opacity: 1;
}

.quiz-option.correct::after { content: " ✓"; color: var(--success); font-weight: 800; }

.quiz-option.wrong {
  border-color: var(--danger);
  background: rgba(248, 113, 113, 0.14);
  opacity: 1;
}

.quiz-option.wrong::after { content: " ✗"; color: var(--danger); font-weight: 800; }

.quiz-explain {
  margin-top: 8px;
  font-size: 0.85rem;
  color: var(--text-dim);
  border-inline-start: 3px solid var(--accent);
  padding-inline-start: 10px;
}

.quiz-score { font-weight: 800; color: var(--accent); margin-top: 4px; }

/* ============ Track & read-time chips ============ */
.track-chip {
  font-size: 0.74rem;
  font-weight: 700;
  padding: 3px 12px;
  border-radius: 999px;
  background: rgba(129, 140, 248, 0.14);
  color: #a5b4fc;
}

[data-theme="light"] .track-chip { color: #6366f1; }

.readtime-chip {
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--text-faint);
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 2px 10px;
  border-radius: 999px;
}

.chip-track { border-color: rgba(129, 140, 248, 0.4); }

/* ============ Cheat sheet ============ */
.print-btn {
  align-self: flex-start;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 8px 18px;
  font-family: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: border-color 0.2s;
}

.print-btn:hover { border-color: var(--accent); }

.cheat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 14px;
}

.cheat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-inline-start: 4px solid var(--accent-2);
  border-radius: 10px;
  padding: 16px 18px;
}

.cheat-title { font-weight: 800; font-size: 0.92rem; margin-bottom: 6px; }

.cheat-ref { color: var(--text-dim); font-size: 0.92rem; }

/* ============ Command palette ============ */
.palette-overlay {
  position: fixed;
  inset: 0;
  background: rgba(5, 8, 14, 0.6);
  backdrop-filter: blur(4px);
  z-index: 400;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 12vh 16px 16px;
}

.palette-overlay[hidden] { display: none; }

.palette {
  width: 100%;
  max-width: 640px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.palette-input-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
}

.palette-icon { font-size: 1.1rem; }

.palette-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text);
  font-family: inherit;
  font-size: 1.05rem;
}

.palette-input:focus { outline: none; }

.palette-kbd, .palette-footer kbd {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2px 8px;
  font-size: 0.72rem;
  color: var(--text-faint);
  font-family: "IBM Plex Mono", monospace;
}

.palette-results {
  list-style: none;
  max-height: 46vh;
  overflow-y: auto;
  padding: 8px;
}

.palette-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
}

.palette-item.selected { background: var(--tag-bg); }

.palette-item-label {
  flex: 1;
  font-size: 0.92rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.palette-item-type {
  font-size: 0.72rem;
  color: var(--text-faint);
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 2px 10px;
  border-radius: 999px;
  white-space: nowrap;
}

.palette-empty { padding: 20px; text-align: center; color: var(--text-dim); }

.palette-footer {
  display: flex;
  gap: 18px;
  padding: 10px 18px;
  border-top: 1px solid var(--border);
  color: var(--text-faint);
  font-size: 0.78rem;
}

/* ============ Print (cheat sheet) ============ */
@media print {
  .site-header, .hero, .news-controls, #news, #models, #benchmarks, #knowledge,
  #security, #important, #archive, .site-footer, .reading-progress,
  .palette-overlay, .skip-link, .print-btn { display: none !important; }

  body { background: #fff; color: #000; }

  .cheat-card { border: 1px solid #999; break-inside: avoid; }

  .cheat-title { color: #000; }

  .cheat-ref { color: #333; }
}

/* ============ Knowledge ============ */
.knowledge-filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 22px; }

.knowledge-list { display: grid; gap: 16px; }

.knowledge-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.knowledge-head {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  cursor: pointer;
  user-select: none;
  transition: background 0.2s;
  list-style: none;
}

.knowledge-head:hover { background: var(--card-hover); }

.knowledge-head::-webkit-details-marker { display: none; }

.knowledge-title-wrap { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }

.knowledge-title { font-size: 1.08rem; font-weight: 700; }

.knowledge-chevron { color: var(--text-faint); transition: transform 0.25s; font-size: 0.9rem; }

.knowledge-card[open] .knowledge-chevron { transform: rotate(180deg); }

.difficulty-chip {
  font-size: 0.74rem;
  font-weight: 700;
  padding: 3px 12px;
  border-radius: 999px;
}

.difficulty-beginner { background: rgba(52, 211, 153, 0.14); color: var(--success); }
.difficulty-intermediate { background: rgba(251, 191, 36, 0.14); color: var(--warning); }
.difficulty-advanced { background: rgba(248, 113, 113, 0.14); color: var(--danger); }

.knowledge-body { padding: 0 24px 24px; }

.knowledge-why {
  color: var(--text-dim);
  font-size: 0.95rem;
  margin-bottom: 18px;
  padding-inline-start: 14px;
  border-inline-start: 3px solid var(--accent);
}

.knowledge-steps { display: grid; gap: 12px; margin-bottom: 18px; }

.knowledge-step {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
}

.step-number {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--gradient);
  color: #fff;
  font-size: 0.82rem;
  font-weight: 800;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  margin-top: 2px;
}

.step-title { font-weight: 700; font-size: 0.96rem; }

.step-detail { color: var(--text-dim); font-size: 0.9rem; }

.knowledge-code {
  position: relative;
  background: #0d1117;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 18px;
  overflow-x: auto;
}

.knowledge-code pre { color: #c9d1d9; font-size: 0.84rem; line-height: 1.6; }

.copy-btn {
  position: absolute;
  top: 10px;
  inset-inline-end: 10px;
  background: #21262d;
  color: #8b949e;
  border: 1px solid #30363d;
  border-radius: 6px;
  padding: 4px 12px;
  font-family: inherit;
  font-size: 0.75rem;
  cursor: pointer;
  transition: color 0.2s;
}

.copy-btn:hover { color: #fff; }

.knowledge-resources { display: flex; flex-wrap: wrap; gap: 8px; }

.resource-link {
  background: var(--tag-bg);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 999px;
}

.resource-link:hover { text-decoration: none; filter: brightness(1.15); }

.knowledge-footer {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--text-faint);
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.knowledge-tag { background: var(--bg); border: 1px solid var(--border); border-radius: 999px; padding: 2px 10px; }

/* ============ Archive ============ */
.archive-list { display: grid; gap: 10px; }

.archive-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 20px;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  width: 100%;
  font-family: inherit;
  color: var(--text);
  text-align: start;
}

.archive-item:hover { border-color: var(--accent); background: var(--card-hover); }

.archive-date { font-weight: 700; white-space: nowrap; }

.archive-headlines {
  color: var(--text-dim);
  font-size: 0.88rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

.archive-detail {
  margin-top: 22px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
}

.archive-detail-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
  gap: 10px;
  flex-wrap: wrap;
}

.archive-detail-title { font-size: 1.2rem; font-weight: 800; }

.archive-close {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: 8px;
  padding: 6px 16px;
  font-family: inherit;
  cursor: pointer;
}

.archive-close:hover { color: var(--text); }

.archive-news-list { display: grid; gap: 10px; }

.archive-news-item {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}

.archive-news-item:last-child { border-bottom: none; }

.archive-news-item .news-category { flex-shrink: 0; }

/* ============ Footer ============ */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 30px 0;
  margin-top: 20px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  color: var(--text-dim);
  font-size: 0.9rem;
}

.footer-brand { display: flex; align-items: center; gap: 10px; }

.footer-sep { margin: 0 4px; }

/* ============ Responsive ============ */
@media (max-width: 860px) {
  .nav-toggle { display: block; }

  .main-nav {
    display: none;
    position: absolute;
    top: 64px;
    inset-inline: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 12px 20px 16px;
    gap: 2px;
  }

  .main-nav.open { display: flex; }

  .live-badge #updatedAt { display: none; }

  .section { padding: 40px 0; }

  .top-story { padding: 24px; }

  .news-controls { flex-direction: column; align-items: stretch; }

  .search-input { min-width: 0; width: 100%; }
}

@media (max-width: 540px) {
  .hero { padding: 36px 0 28px; }

  .archive-item { flex-direction: column; align-items: flex-start; gap: 6px; }

  .archive-headlines { white-space: normal; }
}