/* ===== DESIGN SYSTEM ===== */
:root {
  --bg: #0a0a0f;
  --bg2: #111118;
  --bg3: #18181f;
  --border: #2a2a35;
  --border2: #3a3a48;
  --text: #e8e8f0;
  --text2: #9898b0;
  --text3: #606078;
  --accent: #c8f73a;
  --accent2: #7b61ff;
  --accent3: #ff6b35;
  --accent4: #38e8c8;
  --green: #4ade80;
  --blue: #60a5fa;
  --orange: #fb923c;
  --purple: #c084fc;
  --red: #f87171;
  --teal: #2dd4bf;
  --yellow: #fbbf24;
  --sidebar-w: 240px;
  --font-mono: 'Space Mono', monospace;
  --font-display: 'Fraunces', serif;
  --font-body: 'DM Sans', sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.65;
  min-height: 100vh;
}

/* Grain overlay */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* ===== SIDEBAR ===== */
.sidebar {
  position: fixed;
  left: 0; top: 0; bottom: 0;
  width: var(--sidebar-w);
  background: var(--bg2);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  z-index: 100;
  padding: 0 0 40px;
  transition: transform 0.3s cubic-bezier(0.4,0,0.2,1);
}

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 2px; }

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 24px 20px 20px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 12px;
}

.logo-bracket {
  font-family: var(--font-mono);
  font-size: 28px;
  color: var(--accent);
  line-height: 1;
}

.logo-text {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.2;
  letter-spacing: 0.1em;
}

.nav-section-label {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.15em;
  color: var(--text2);
  padding: 14px 20px 4px;
  text-transform: uppercase;
}

.nav-link {
  display: block;
  padding: 7px 20px;
  color: var(--text2);
  text-decoration: none;
  font-size: 13px;
  transition: all 0.15s;
  border-left: 2px solid transparent;
}

.nav-link:hover {
  color: var(--text);
  background: var(--bg3);
  border-left-color: var(--accent);
}

.nav-link.active {
  color: var(--accent);
  background: rgba(200, 247, 58, 0.06);
  border-left-color: var(--accent);
}

/* ===== HAMBURGER ===== */
.hamburger {
  display: none;
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 200;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 6px;
  width: 40px;
  height: 40px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
}
.hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s;
}

/* ===== MAIN CONTENT ===== */
.main-content {
  margin-left: var(--sidebar-w);
  padding: 0 48px 80px;
  max-width: 1200px;
}

/* ===== HERO ===== */
.hero {
  padding: 80px 0 60px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 60px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -100px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(200,247,58,0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0.15em;
  margin-bottom: 20px;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(42px, 6vw, 80px);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.hero-title em {
  font-style: italic;
  color: var(--accent);
}

.hero-sub {
  color: var(--text2);
  font-size: 16px;
  max-width: 500px;
  margin-bottom: 40px;
}

.hero-stats {
  display: flex;
  gap: 40px;
}

.stat {
  display: flex;
  flex-direction: column;
}

.stat-num {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}

.stat-label {
  font-size: 12px;
  color: var(--text2);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-top: 4px;
}

/* ===== SECTIONS ===== */
.content-section {
  margin-bottom: 80px;
  scroll-margin-top: 20px;
}

.section-header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 32px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.section-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0.1em;
  border: 1px solid var(--accent);
  padding: 2px 8px;
  border-radius: 3px;
}

.section-header h2 {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

/* ===== CARDS ===== */
.card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  transition: border-color 0.2s;
}

.card:hover { border-color: var(--border2); }

.card h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 14px;
}

.card h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text2);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 20px 0 10px;
}

.card p { color: var(--text2); margin-bottom: 10px; font-size: 14px; }
.card p:last-child { margin-bottom: 0; }

.card-accent-green { border-top: 3px solid var(--green); }
.card-accent-blue  { border-top: 3px solid var(--blue); }
.card-accent-orange{ border-top: 3px solid var(--orange); }
.card-accent-purple{ border-top: 3px solid var(--purple); }
.card-accent-red   { border-top: 3px solid var(--red); }
.card-accent-teal  { border-top: 3px solid var(--teal); }

.card-icon { font-size: 32px; margin-bottom: 12px; }

.card-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.card-grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }

.mt-4 { margin-top: 24px; }

/* ===== MATH ===== */
.math-block {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 20px;
  margin: 12px 0;
  overflow-x: auto;
  font-size: 15px;
}

/* ===== CODE BLOCKS ===== */
.code-block {
  background: #0d1117;
  border: 1px solid #30363d;
  border-radius: 8px;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: #c9d1d9;
  overflow-x: auto;
  margin: 12px 0;
  white-space: pre;
}

.code-comment { color: #6e7681; }

/* ===== INSIGHT BOX ===== */
.insight-box {
  background: rgba(200, 247, 58, 0.06);
  border: 1px solid rgba(200, 247, 58, 0.25);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  padding: 12px 16px;
  font-size: 13px;
  color: var(--text);
  margin: 12px 0;
}

/* ===== TAGS ===== */
.tag-list { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; }
.tag {
  background: var(--bg3);
  border: 1px solid var(--border2);
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--text2);
}

.use-tag {
  display: inline-block;
  background: rgba(123, 97, 255, 0.12);
  border: 1px solid rgba(123, 97, 255, 0.3);
  color: var(--accent2);
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 11px;
  font-family: var(--font-mono);
  margin-top: 8px;
}

/* ===== TABLES ===== */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin: 12px 0;
}

.compare-table th {
  background: var(--bg3);
  padding: 8px 12px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--text2);
  border-bottom: 1px solid var(--border);
}

.compare-table td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  color: var(--text2);
  vertical-align: top;
}

.compare-table tr:hover td { background: var(--bg3); }

/* ===== ACTIVATION GRID ===== */
.activation-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.activation-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  transition: border-color 0.2s, transform 0.2s;
}

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

.act-name {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
}

.act-chart {
  height: 80px;
  margin: 10px 0;
}

.act-chart canvas { width: 100% !important; height: 80px !important; }

.act-deriv {
  font-size: 12px;
  color: var(--text2);
  margin: 6px 0;
}

.pros-cons {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 10px;
}
.pro { font-size: 12px; color: var(--green); }
.con { font-size: 12px; color: var(--red); }

/* ===== FFNN DIAGRAM ===== */
.ffnn-diagram {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

/* ===== LSTM DIAGRAM ===== */
.lstm-diagram-wrapper {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 24px;
  display: flex;
  justify-content: center;
  padding: 20px;
}

.card-grid-2 .gate-card { padding: 20px; }

.gate-label {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 10px;
}

.gate-forget .gate-label { color: var(--red); }
.gate-input .gate-label  { color: var(--green); }
.gate-cell .gate-label   { color: var(--yellow); }
.gate-output .gate-label { color: var(--blue); }

/* ===== TRANSFORMER DIAGRAM ===== */
.transformer-diagram-wrapper {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 20px;
}

/* ===== OPTIMIZER TIMELINE ===== */
.optimizer-timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.opt-item {
  display: flex;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}
.opt-item:last-child { border-bottom: none; }

.opt-year {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--text2);
  width: 60px;
  flex-shrink: 0;
  padding-top: 4px;
  letter-spacing: 0.05em;
}

.opt-content h4 {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}
.opt-content p { color: var(--text2); font-size: 13px; }

.opt-highlight {
  background: rgba(200, 247, 58, 0.04);
  border-radius: 8px;
  padding: 20px !important;
  border: 1px solid rgba(200, 247, 58, 0.15) !important;
  margin: 4px 0;
}
.opt-highlight .opt-year { color: var(--accent); }

/* ===== ATTENTION VIZ ===== */
.attention-viz {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-top: 10px;
}

/* ===== INTERVIEW Q&A ===== */
.interview-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.qa-item {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  transition: border-color 0.2s;
}

.qa-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  cursor: pointer;
  user-select: none;
  gap: 16px;
}

.qa-question:hover { background: var(--bg3); }

.qa-q-text {
  font-weight: 500;
  font-size: 15px;
  flex: 1;
}

.qa-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  border-radius: 4px;
  flex-shrink: 0;
}
.qa-tag-fundamentals { background: rgba(96,165,250,0.15); color: var(--blue); }
.qa-tag-architecture  { background: rgba(196,132,252,0.15); color: var(--purple); }
.qa-tag-training      { background: rgba(74,222,128,0.15); color: var(--green); }
.qa-tag-practical     { background: rgba(251,146,60,0.15); color: var(--orange); }
.qa-tag-advanced      { background: rgba(248,113,113,0.15); color: var(--red); }

.qa-chevron {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--text2);
  transition: transform 0.3s;
}

.qa-item.open .qa-chevron { transform: rotate(180deg); }
.qa-item.open { border-color: var(--border2); }

.qa-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.4,0,0.2,1);
}

.qa-answer-inner {
  padding: 0 24px 20px;
  color: var(--text2);
  font-size: 14px;
  border-top: 1px solid var(--border);
}

.qa-answer-inner p { margin-bottom: 10px; }
.qa-answer-inner strong { color: var(--text); }
.qa-answer-inner .math-block { font-size: 13px; }

.interview-filters {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 7px 16px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--bg2);
  color: var(--text2);
  font-size: 12px;
  font-family: var(--font-mono);
  cursor: pointer;
  transition: all 0.15s;
  letter-spacing: 0.05em;
}

.filter-btn:hover, .filter-btn.active {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}

/* ===== SYSDESIGN ===== */
.sysdesign-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.step {
  display: flex;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}
.step:last-child { border-bottom: none; }

.step-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  flex-shrink: 0;
}

.step strong { display: block; font-size: 16px; margin-bottom: 6px; }
.step p { font-size: 13px; color: var(--text2); }

.sysdesign-mini {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg3);
  padding: 12px;
  border-radius: 8px;
  margin: 12px 0;
}

.mini-stage {
  background: var(--bg2);
  border: 1px solid var(--border2);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 12px;
  font-family: var(--font-mono);
  white-space: nowrap;
}

.mini-arrow { color: var(--accent); font-size: 16px; }

/* ===== FOOTER ===== */
.footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  margin-top: 40px;
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.logo-text-sm {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  color: var(--accent);
}

.footer p { color: var(--text2); font-size: 13px; }
.footer-note { font-size: 11px; color: var(--text3); margin-top: 4px; }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .main-content { padding: 0 32px 80px; }
  .card-grid-3 { grid-template-columns: 1fr 1fr; }
  .activation-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .hamburger { display: flex; }
  .main-content {
    margin-left: 0;
    padding: 0 20px 60px;
  }
  .hero { padding: 80px 0 40px; }
  .card-grid-2, .card-grid-3, .two-col {
    grid-template-columns: 1fr;
  }
  .activation-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 24px; }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.content-section {
  animation: fadeUp 0.5s ease both;
}

/* MathJax override */
.MJX-TEX { font-size: 100% !important; }
mjx-container { overflow-x: auto; max-width: 100%; }

/* ===== READING PROGRESS BAR ===== */
#progress-bar {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  z-index: 9998;
  transition: width 0.1s linear;
  border-radius: 0 2px 2px 0;
}

/* ===== THEME TOGGLE ===== */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 8px;
  cursor: pointer;
  font-size: 14px;
  margin-left: auto;
  transition: border-color 0.2s, background 0.2s;
  flex-shrink: 0;
}
.theme-toggle:hover { border-color: var(--accent); background: var(--bg3); }

/* ===== SIDEBAR SEARCH ===== */
.sidebar-search-wrap {
  position: relative;
  margin: 10px 14px 6px;
}
.search-icon {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text2);
  font-size: 16px;
  pointer-events: none;
  line-height: 1;
}
.sidebar-search {
  width: 100%;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px 8px 30px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 12px;
  outline: none;
  transition: border-color 0.2s;
}
.sidebar-search::placeholder { color: var(--text2); }
.sidebar-search:focus { border-color: var(--accent); }

/* ===== BACK TO TOP ===== */
#back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--bg);
  border: none;
  font-size: 20px;
  font-weight: 700;
  cursor: pointer;
  z-index: 500;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity 0.25s, transform 0.25s;
  box-shadow: 0 4px 16px rgba(200,247,58,0.25);
}
#back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
#back-to-top:hover { background: #d4f85a; transform: translateY(-2px); }

/* ===== COPY CODE BUTTON ===== */
.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--bg2);
  border: 1px solid var(--border2);
  color: var(--text2);
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 3px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s;
  letter-spacing: 0.05em;
}
.copy-btn:hover { color: var(--text); border-color: var(--accent); }
.copy-btn.copied { color: var(--green); border-color: var(--green); }

/* ===== QA COUNT ===== */
.qa-count {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text2);
  margin-bottom: 12px;
  letter-spacing: 0.05em;
}

/* ===== LIGHT THEME ===== */
[data-theme="light"] {
  --bg:     #f5f5f7;
  --bg2:    #ffffff;
  --bg3:    #ebebef;
  --border: #d8d8e0;
  --border2: #c0c0cc;
  --text:   #111118;
  --text2:  #55556a;
  --text3:  #888899;
  --accent: #5c9b00;
  --accent2: #5b3fd8;
  --green:  #1a8a40;
  --blue:   #1a6bc0;
  --orange: #b84800;
  --purple: #7c35bb;
  --red:    #c02020;
  --teal:   #0a8a78;
  --yellow: #b07800;
}

[data-theme="light"] .grain { opacity: 0; }
[data-theme="light"] .sidebar { box-shadow: 2px 0 12px rgba(0,0,0,0.08); }
[data-theme="light"] .code-block { background: #f0f0f5; border-color: #d0d0dc; color: #2a2a40; }
[data-theme="light"] .math-block { background: #f8f8fb; }
[data-theme="light"] #progress-bar { background: linear-gradient(90deg, #5c9b00, #5b3fd8); }
[data-theme="light"] .insight-box { background: rgba(92,155,0,0.07); border-color: rgba(92,155,0,0.3); }
[data-theme="light"] .act-chart canvas,
[data-theme="light"] #ffnn-diagram canvas,
[data-theme="light"] .lstm-diagram-wrapper canvas,
[data-theme="light"] .transformer-diagram-wrapper canvas,
[data-theme="light"] .attention-viz canvas { filter: invert(1) hue-rotate(180deg); }
[data-theme="light"] #back-to-top { box-shadow: 0 4px 16px rgba(92,155,0,0.25); }

/* ===== GLOSSARY ===== */
.glossary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 14px;
}
.glossary-item {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 20px;
  transition: border-color 0.2s;
}
.glossary-item:hover { border-color: var(--border2); }
.glossary-term {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 6px;
}
.glossary-def { font-size: 13px; color: var(--text2); line-height: 1.55; }
.glossary-def strong { color: var(--text); }

.glossary-search-wrap {
  margin-bottom: 20px;
  position: relative;
}
.glossary-search {
  width: 100%;
  max-width: 400px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 16px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}
.glossary-search:focus { border-color: var(--accent); }
.glossary-search::placeholder { color: var(--text2); }

/* ===== CHEAT SHEET ===== */
.cheatsheet-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}
.cs-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}
.cs-card-header {
  background: var(--bg3);
  border-bottom: 1px solid var(--border);
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--accent);
}
.cs-card-body { padding: 14px 16px; }
.cs-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 5px 0;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  gap: 12px;
}
.cs-row:last-child { border-bottom: none; }
.cs-key { color: var(--text2); flex-shrink: 0; }
.cs-val { font-family: var(--font-mono); font-size: 11px; color: var(--text); text-align: right; }

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text2); }