:root {
  --bg: #eef2f7;
  --card-bg: #ffffff;
  --text: #0f172a;
  --text-secondary: #334155;
  --muted: #64748b;
  --border: #e2e8f0;
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  --radius: 16px;
  --gold: #d4a13e;
  --green: #16a34a;
  --red: #ef4444;
  --nav-bg: #ffffff;
  --nav-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  --input-bg: #f8fafc;
  --hover-bg: #f1f5f9;
  --gradient-start: #7c3aed;
  --gradient-end: #2563eb;
  --blue: #2563eb;
  --blue-light: #dbeafe;
  --font: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Noto Serif TC', 'Noto Sans TC', serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
  --radius-sm: 6px;
  --max-width: 1600px;
}

[data-theme="dark"] {
  --bg: #0f172a;
  --card-bg: #1e293b;
  --text: #f1f5f9;
  --text-secondary: #cbd5e1;
  --muted: #b4c8de;
  --border: #334155;
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  --nav-bg: #1e293b;
  --nav-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
  --input-bg: #0f172a;
  --hover-bg: #334155;
  --gradient-start: #8b5cf6;
  --gradient-end: #3b82f6;
  --blue: #3b82f6;
  --blue-light: #1e3a5f;
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  transition: background 0.3s, color 0.3s;
  padding: 20px;
  min-height: 100vh;
  line-height: 1.65;
}

.bg-atmosphere {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(ellipse 70% 45% at 8% -8%, rgba(37, 99, 235, 0.14), transparent 55%),
    radial-gradient(ellipse 55% 35% at 92% 4%, rgba(124, 58, 237, 0.1), transparent 50%),
    radial-gradient(ellipse 45% 28% at 50% 100%, rgba(212, 161, 62, 0.07), transparent 55%),
    var(--bg);
}

.bg-atmosphere::after {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background-image: radial-gradient(rgba(15, 23, 42, 0.08) 1px, transparent 1px);
  background-size: 22px 22px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 20%, transparent 75%);
}

[data-theme="dark"] .bg-atmosphere {
  background:
    radial-gradient(ellipse 70% 45% at 8% -8%, rgba(59, 130, 246, 0.2), transparent 55%),
    radial-gradient(ellipse 55% 35% at 92% 4%, rgba(139, 92, 246, 0.14), transparent 50%),
    radial-gradient(ellipse 45% 28% at 50% 100%, rgba(212, 161, 62, 0.06), transparent 55%),
    var(--bg);
}

[data-theme="dark"] .bg-atmosphere::after {
  opacity: 0.25;
  background-image: radial-gradient(rgba(241, 245, 249, 0.12) 1px, transparent 1px);
}

.container {
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 0 20px;
}

:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

/* ===== Navbar ===== */
.navbar {
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 18px 12px 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--nav-shadow);
  margin-bottom: 28px;
  transition: background 0.3s, border-color 0.3s, box-shadow 0.3s;
  flex-wrap: wrap;
  gap: 12px;
  backdrop-filter: blur(16px) saturate(1.2);
  position: sticky;
  top: 12px;
  z-index: 40;
}

[data-theme="dark"] .navbar {
  background: rgba(30, 41, 59, 0.78);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
  min-width: 0;
}

.logo-mark {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  color: #fff;
  font-size: 16px;
  background: linear-gradient(145deg, #6d28d9, #2563eb);
  box-shadow: 0 8px 18px rgba(37, 99, 235, 0.28);
}

.logo-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.logo-name {
  font-family: var(--font);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-tag {
  font-size: 11px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 240px;
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.nav-menu {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  padding: 4px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.04);
  border: 1px solid rgba(15, 23, 42, 0.04);
}

[data-theme="dark"] .nav-menu {
  background: rgba(15, 23, 42, 0.35);
  border-color: rgba(255, 255, 255, 0.04);
}

.nav-link {
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-secondary);
  text-decoration: none;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}

.nav-link:hover {
  background: rgba(255, 255, 255, 0.7);
  color: var(--text);
}

[data-theme="dark"] .nav-link:hover {
  background: rgba(51, 65, 85, 0.7);
}

.nav-link.active {
  background: linear-gradient(135deg, rgba(109, 40, 217, 0.12), rgba(37, 99, 235, 0.16));
  color: var(--blue);
  box-shadow: inset 0 0 0 1px rgba(37, 99, 235, 0.18);
}

[data-theme="dark"] .nav-link.active {
  color: #93c5fd;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(59, 130, 246, 0.22));
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 4px;
  transition: 0.3s;
}

#themeToggle {
  background: var(--card-bg);
  border: 1px solid var(--border);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, color 0.2s, transform 0.2s;
}

#themeToggle:hover {
  background: var(--hover-bg);
  border-color: transparent;
  color: var(--text);
  transform: translateY(-1px);
}

/* ===== Shared card surface (match research / news) ===== */
.learn-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--nav-shadow);
  margin-bottom: 16px;
  transition: background 0.3s, box-shadow 0.3s;
  position: relative;
  overflow: hidden;
}

.track-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 10px;
}

.track-badge--blue {
  color: var(--blue);
  background: var(--blue-light);
}

.track-badge--gold {
  color: #a16207;
  background: rgba(212, 161, 62, 0.18);
}

[data-theme="dark"] .track-badge--gold {
  color: #fbbf24;
  background: rgba(212, 161, 62, 0.15);
}

/* ===== Masthead ===== */
.learn-masthead {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(300px, 0.95fr);
  gap: 32px 48px;
  align-items: center;
  width: 100%;
  min-height: 380px;
  padding: 48px 48px 44px;
  margin-bottom: 16px;
  background:
    radial-gradient(ellipse 70% 90% at 94% 12%, rgba(37, 99, 235, 0.16), transparent 55%),
    radial-gradient(ellipse 48% 70% at 4% 92%, rgba(124, 58, 237, 0.12), transparent 52%),
    linear-gradient(180deg, rgba(255,255,255,0.55), transparent 42%),
    var(--card-bg);
  animation: riseIn 0.65s ease both;
  isolation: isolate;
}

.learn-masthead::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.4;
  background-image:
    linear-gradient(rgba(37, 99, 235, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 99, 235, 0.05) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: radial-gradient(ellipse 70% 65% at 20% 40%, #000 10%, transparent 70%);
}

.learn-masthead::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end), transparent 85%);
  z-index: 2;
}

[data-theme="dark"] .learn-masthead {
  background:
    radial-gradient(ellipse 70% 90% at 94% 12%, rgba(59, 130, 246, 0.24), transparent 55%),
    radial-gradient(ellipse 48% 70% at 4% 92%, rgba(139, 92, 246, 0.16), transparent 52%),
    var(--card-bg);
}

@keyframes riseIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.masthead-copy {
  position: relative;
  z-index: 1;
  max-width: 36rem;
}

.masthead-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 12px;
}

.masthead-kicker::before {
  content: '';
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
}

.learn-masthead .page-main-title {
  font-family: var(--font-serif);
  font-size: clamp(2.6rem, 5vw, 3.75rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--text);
  margin-bottom: 16px;
}

.learn-masthead .page-subtitle {
  font-size: 16.5px;
  color: var(--text-secondary);
  margin-bottom: 28px;
  line-height: 1.75;
  max-width: 30rem;
}

.masthead-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.cta-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(135deg, #6d28d9 0%, #2563eb 100%);
  color: #fff;
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  padding: 14px 22px;
  border-radius: 12px;
  box-shadow: 0 10px 28px rgba(37, 99, 235, 0.28);
  transition: transform 0.2s, box-shadow 0.2s, filter 0.2s;
}

.cta-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 34px rgba(37, 99, 235, 0.36);
  filter: brightness(1.06);
  color: #fff;
}

.cta-primary i {
  transition: transform 0.2s;
}

.cta-primary:hover i {
  transform: translateX(3px);
}

.cta-secondary {
  display: inline-flex;
  align-items: center;
  padding: 14px 20px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(8px);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: border-color 0.2s, color 0.2s, background 0.2s, transform 0.2s;
}

[data-theme="dark"] .cta-secondary {
  background: rgba(30, 41, 59, 0.7);
}

.cta-secondary:hover {
  border-color: var(--blue);
  color: var(--blue);
  background: var(--blue-light);
  transform: translateY(-1px);
}

.masthead-visual {
  position: relative;
  z-index: 1;
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-stage {
  position: relative;
  width: min(100%, 440px);
  height: 300px;
  animation: riseIn 0.8s ease 0.1s both;
}

.hero-glow {
  position: absolute;
  inset: 12% 6% 8%;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.28), transparent 70%);
  filter: blur(22px);
  pointer-events: none;
  animation: glowPulse 4.5s ease-in-out infinite;
}

@keyframes glowPulse {
  0%, 100% { opacity: 0.75; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.05); }
}

.hero-panel {
  position: absolute;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.12);
  padding: 14px 16px;
  transition: transform 0.35s ease;
}

[data-theme="dark"] .hero-panel {
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
}

.hero-panel--back {
  width: 58%;
  height: 150px;
  right: 0;
  top: 8px;
  transform: rotate(4deg);
  opacity: 0.92;
  z-index: 1;
}

.hero-panel--mid {
  width: 46%;
  height: auto;
  min-height: 178px;
  left: 0;
  bottom: 18px;
  transform: rotate(-5deg);
  z-index: 2;
  padding-bottom: 12px;
}

.hero-panel--front {
  width: 72%;
  left: 14%;
  top: 58px;
  z-index: 3;
  padding: 16px 18px 14px;
  box-shadow: 0 22px 48px rgba(15, 23, 42, 0.16);
}

.hero-stage:hover .hero-panel--back { transform: rotate(2deg) translateY(-4px); }
.hero-stage:hover .hero-panel--mid { transform: rotate(-3deg) translateY(2px); }
.hero-stage:hover .hero-panel--front { transform: translateY(-6px); }

.hero-panel-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.hero-panel-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.hero-chip {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--blue);
  background: var(--blue-light);
  padding: 3px 8px;
  border-radius: 999px;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 10px;
}

.hm-label {
  display: block;
  font-size: 10px;
  color: var(--muted);
  margin-bottom: 2px;
}

.hm-value {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.02em;
}

.hm-value--up {
  color: var(--green);
}

.hero-spark {
  width: 100%;
  height: 48px;
  display: block;
}

.spark-line {
  stroke-dasharray: 280;
  stroke-dashoffset: 280;
  animation: drawSpark 1.2s ease 0.35s forwards;
}

@keyframes drawSpark {
  to { stroke-dashoffset: 0; }
}

.hero-bars {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  height: 88px;
  margin-top: 16px;
  padding: 0 4px;
}

.hero-bars span {
  flex: 1;
  height: var(--h);
  border-radius: 6px 6px 2px 2px;
  background: linear-gradient(180deg, #8b5cf6, #2563eb);
  opacity: 0.85;
}

.hero-ring {
  width: 56px;
  height: 56px;
  margin: 10px auto 8px;
  border-radius: 50%;
  background:
    conic-gradient(#2563eb 0 48%, #d4a13e 48% 72%, #cbd5e1 72% 100%);
  mask: radial-gradient(circle, transparent 52%, #000 53%);
  -webkit-mask: radial-gradient(circle, transparent 52%, #000 53%);
}

.hero-legend {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin: 0;
  padding: 0;
  font-size: 10px;
  line-height: 1.35;
  color: var(--muted);
}

.hero-legend li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.hero-legend i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #2563eb;
}

.hero-legend i.alt { background: #d4a13e; }
.hero-legend i.muted { background: #94a3b8; }

/* ===== Reading path ===== */
.reading-path {
  padding: 32px 34px 34px;
  margin-bottom: 16px;
  animation: riseIn 0.65s ease 0.08s both;
  background:
    radial-gradient(ellipse 55% 80% at 100% 0%, rgba(37, 99, 235, 0.1), transparent 55%),
    linear-gradient(180deg, rgba(124, 58, 237, 0.04), transparent 40%),
    var(--card-bg);
}

.reading-path-top {
  margin-bottom: 28px;
}

.reading-path-title {
  font-family: var(--font-serif);
  font-size: clamp(1.45rem, 2.4vw, 1.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}

.reading-path-hint {
  font-size: 14px;
  color: var(--muted);
}

.reading-path-list {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  list-style: none;
  position: relative;
  counter-reset: none;
}

.reading-path-list::before {
  content: '';
  position: absolute;
  left: 6%;
  right: 6%;
  top: 22px;
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--gradient-start) 12%,
    var(--gradient-end) 88%,
    transparent
  );
  opacity: 0.45;
  z-index: 0;
  pointer-events: none;
  background-size: 200% 100%;
  animation: pathPulse 4.5s ease-in-out infinite;
}

@keyframes pathPulse {
  0%, 100% { background-position: 0% 0; opacity: 0.35; }
  50% { background-position: 100% 0; opacity: 0.55; }
}

.reading-path-list li {
  position: relative;
  z-index: 1;
  animation: riseIn 0.55s ease both;
  animation-delay: calc(0.12s + var(--i, 0) * 0.06s);
}

.reading-path-list a {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
  text-decoration: none;
  color: var(--text);
  padding: 0 14px 8px;
  transition: transform 0.25s ease;
  height: 100%;
}

.reading-path-list a:hover {
  transform: translateY(-4px);
}

.reading-path-list a:hover .path-index {
  transform: scale(1.06);
  box-shadow: 0 10px 24px rgba(37, 99, 235, 0.38);
}

.reading-path-list a:hover .path-title {
  color: var(--blue);
}

.path-index {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.22);
  border: 3px solid var(--card-bg);
  transition: transform 0.25s, box-shadow 0.25s;
}

.path-body {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
  padding-left: 2px;
}

.path-title {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.015em;
  transition: color 0.2s;
}

.path-desc {
  font-size: 12.5px;
  color: var(--muted);
  line-height: 1.4;
}

/* ===== Track bands ===== */
.track-band {
  padding: 32px 34px 34px;
  margin-bottom: 16px;
  overflow: hidden;
}

.track-band--beginner {
  background:
    radial-gradient(ellipse 40% 50% at 100% 0%, rgba(37, 99, 235, 0.1), transparent 55%),
    linear-gradient(135deg, rgba(37, 99, 235, 0.05), transparent 48%),
    var(--card-bg);
  border-top: 3px solid var(--blue);
}

.track-band--advanced {
  background:
    radial-gradient(ellipse 40% 50% at 0% 0%, rgba(212, 161, 62, 0.12), transparent 55%),
    linear-gradient(225deg, rgba(212, 161, 62, 0.08), transparent 48%),
    var(--card-bg);
  border-top: 3px solid var(--gold);
}

.track-band-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 26px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
  position: relative;
}

.track-band-header h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 2.8vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: 6px;
}

.track-band-header p {
  font-size: 14px;
  color: var(--muted);
  max-width: 28rem;
}

.track-watermark {
  font-family: var(--font-serif);
  font-size: clamp(5rem, 10vw, 7.5rem);
  font-weight: 700;
  line-height: 0.75;
  letter-spacing: -0.06em;
  color: var(--blue);
  opacity: 0.08;
  user-select: none;
  pointer-events: none;
  transform: translateY(10px);
}

.track-watermark--gold {
  color: var(--gold);
  opacity: 0.14;
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.topic-grid--advanced {
  grid-template-columns: repeat(3, 1fr);
}

.topic-tile {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px 20px 18px;
  background:
    linear-gradient(180deg, rgba(248, 250, 252, 0.9), transparent 40%),
    var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  text-decoration: none;
  color: var(--text);
  position: relative;
  overflow: hidden;
  min-height: 210px;
  transition: transform 0.28s ease, box-shadow 0.28s ease, border-color 0.2s;
}

[data-theme="dark"] .topic-tile {
  background:
    linear-gradient(180deg, rgba(15, 23, 42, 0.45), transparent 42%),
    var(--card-bg);
}

.track-band--advanced .topic-tile {
  background:
    linear-gradient(180deg, rgba(212, 161, 62, 0.06), transparent 42%),
    var(--card-bg);
}

[data-theme="dark"] .track-band--advanced .topic-tile {
  background:
    linear-gradient(180deg, rgba(212, 161, 62, 0.08), transparent 42%),
    var(--card-bg);
}

.topic-viz {
  width: 76px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 4px;
  padding: 8px 10px;
  color: var(--blue);
  background:
    linear-gradient(145deg, rgba(37, 99, 235, 0.12), rgba(124, 58, 237, 0.08));
  border: 1px solid rgba(37, 99, 235, 0.12);
  position: relative;
  overflow: hidden;
  transition: transform 0.28s ease, box-shadow 0.28s ease, border-color 0.2s;
}

.track-band--advanced .topic-viz {
  color: #a16207;
  background: linear-gradient(145deg, rgba(212, 161, 62, 0.16), rgba(37, 99, 235, 0.06));
  border-color: rgba(212, 161, 62, 0.22);
}

[data-theme="dark"] .track-band--advanced .topic-viz {
  color: #fbbf24;
}

.topic-viz svg {
  width: 100%;
  height: 100%;
  display: block;
}

/* viz variants */
.topic-tile[data-viz="bars"] .topic-viz {
  align-items: flex-end;
}

.topic-tile[data-viz="bars"] .topic-viz i {
  display: block;
  width: 7px;
  height: var(--h, 50%);
  border-radius: 2px 2px 0 0;
  background: currentColor;
  opacity: 0.55;
  animation: barGrow 1.2s ease both;
}

.topic-tile[data-viz="bars"] .topic-viz i:nth-child(2) { opacity: 0.7; animation-delay: 0.05s; }
.topic-tile[data-viz="bars"] .topic-viz i:nth-child(3) { opacity: 0.55; animation-delay: 0.1s; }
.topic-tile[data-viz="bars"] .topic-viz i:nth-child(4) { opacity: 0.85; animation-delay: 0.15s; }
.topic-tile[data-viz="bars"] .topic-viz i:nth-child(5) { opacity: 0.65; animation-delay: 0.2s; }

@keyframes barGrow {
  from { transform: scaleY(0.2); transform-origin: bottom; }
  to { transform: scaleY(1); transform-origin: bottom; }
}

.topic-tile[data-viz="grid"] .topic-viz {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5px;
  align-content: center;
  padding: 10px;
}

.topic-tile[data-viz="grid"] .topic-viz i {
  display: block;
  aspect-ratio: 1;
  border-radius: 4px;
  background: currentColor;
  opacity: 0.35;
}

.topic-tile[data-viz="grid"] .topic-viz i:nth-child(1) { opacity: 0.75; }
.topic-tile[data-viz="grid"] .topic-viz i:nth-child(4) { opacity: 0.55; }

.topic-tile[data-viz="flow"] .topic-viz {
  align-items: center;
  gap: 6px;
}

.topic-tile[data-viz="flow"] .topic-viz i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.35;
  position: relative;
}

.topic-tile[data-viz="flow"] .topic-viz i:nth-child(2) { opacity: 0.7; width: 12px; height: 12px; }
.topic-tile[data-viz="flow"] .topic-viz i:nth-child(3) { opacity: 0.45; }

.topic-tile[data-viz="flow"] .topic-viz i:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 100%;
  top: 50%;
  width: 8px;
  height: 2px;
  background: currentColor;
  opacity: 0.35;
  transform: translateY(-50%);
}

.topic-tile[data-viz="panel"] .topic-viz {
  flex-direction: column;
  align-items: stretch;
  justify-content: center;
  gap: 4px;
  padding: 10px;
}

.topic-tile[data-viz="panel"] .topic-viz i {
  display: block;
  height: 6px;
  border-radius: 3px;
  background: currentColor;
  opacity: 0.3;
}

.topic-tile[data-viz="panel"] .topic-viz i:nth-child(1) { width: 100%; opacity: 0.7; }
.topic-tile[data-viz="panel"] .topic-viz i:nth-child(2) { width: 72%; opacity: 0.45; }
.topic-tile[data-viz="panel"] .topic-viz i:nth-child(3) { width: 88%; opacity: 0.35; }

.topic-tile[data-viz="alert"] .topic-viz,
.topic-tile[data-viz="shield"] .topic-viz,
.topic-tile[data-viz="ring"] .topic-viz {
  align-items: center;
  justify-content: center;
}

.topic-tile[data-viz="alert"] .topic-viz i {
  width: 0;
  height: 0;
  border-left: 12px solid transparent;
  border-right: 12px solid transparent;
  border-bottom: 20px solid currentColor;
  opacity: 0.55;
  background: none;
}

.topic-tile[data-viz="shield"] .topic-viz i {
  width: 22px;
  height: 26px;
  background: currentColor;
  opacity: 0.45;
  border-radius: 4px 4px 12px 12px;
  clip-path: polygon(50% 0%, 100% 18%, 100% 62%, 50% 100%, 0% 62%, 0% 18%);
}

.topic-tile[data-viz="ring"] .topic-viz i {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: conic-gradient(currentColor 0 55%, rgba(148, 163, 184, 0.45) 55% 78%, rgba(212, 161, 62, 0.7) 78% 100%);
  mask: radial-gradient(circle, transparent 48%, #000 50%);
  -webkit-mask: radial-gradient(circle, transparent 48%, #000 50%);
}

.topic-tile[data-viz="news"] .topic-viz {
  flex-direction: column;
  align-items: stretch;
  justify-content: center;
  gap: 5px;
  padding: 10px 12px;
}

.topic-tile[data-viz="news"] .topic-viz i {
  display: block;
  height: 4px;
  border-radius: 2px;
  background: currentColor;
  opacity: 0.3;
}

.topic-tile[data-viz="news"] .topic-viz i:first-child {
  width: 40%;
  height: 7px;
  opacity: 0.7;
}

.topic-tile[data-viz="map"] .topic-viz {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  grid-template-rows: 1fr 1fr;
  gap: 4px;
  padding: 9px;
  align-content: stretch;
}

.topic-tile[data-viz="map"] .topic-viz i {
  display: block;
  border-radius: 4px;
  background: currentColor;
  opacity: 0.28;
  height: 100%;
  min-height: 10px;
}

.topic-tile[data-viz="map"] .topic-viz i:nth-child(1) {
  grid-row: span 2;
  opacity: 0.55;
}

.topic-tile[data-viz="spark"] .topic-viz {
  padding: 6px 8px;
  align-items: center;
}

.topic-tile::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--gradient-start), var(--gradient-end));
  opacity: 0;
  transition: opacity 0.2s;
}

.track-band--advanced .topic-tile::before {
  background: linear-gradient(180deg, #f59e0b, var(--gold));
}

.topic-tile:hover {
  transform: translateY(-5px);
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.12);
  border-color: transparent;
}

.topic-tile:hover::before {
  opacity: 1;
}

.topic-tile:hover .topic-viz {
  transform: translateY(-2px) scale(1.04);
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.18);
  border-color: transparent;
}

.track-band--advanced .topic-tile:hover .topic-viz {
  box-shadow: 0 8px 20px rgba(212, 161, 62, 0.22);
}

.topic-num {
  position: absolute;
  right: 16px;
  top: 14px;
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.05em;
  opacity: 0.07;
  line-height: 1;
  pointer-events: none;
  transition: opacity 0.25s, color 0.25s;
}

.topic-tile:hover .topic-num {
  opacity: 0.16;
  color: var(--blue);
}

.track-band--advanced .topic-tile:hover .topic-num {
  color: var(--gold);
}

.topic-tile h3 {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.35;
  padding-right: 48px;
}

.topic-tile p {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.55;
  flex: 1;
}

.topic-meta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  margin-top: 4px;
}

.topic-tile:hover .topic-meta {
  color: var(--blue);
}

.track-band--advanced .topic-tile:hover .topic-meta {
  color: #a16207;
}

[data-theme="dark"] .track-band--advanced .topic-tile:hover .topic-meta {
  color: #fbbf24;
}

.topic-meta i {
  font-size: 10px;
  transition: transform 0.2s;
}

.topic-tile:hover .topic-meta i {
  transform: translateX(4px);
}

.topic-tile--featured {
  grid-column: span 3;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(140px, 220px) 1fr;
  gap: 20px 28px;
  align-items: center;
  padding: 26px 28px;
  background:
    radial-gradient(ellipse 50% 90% at 0% 50%, rgba(124, 58, 237, 0.14), transparent 55%),
    radial-gradient(ellipse 40% 80% at 100% 50%, rgba(37, 99, 235, 0.12), transparent 50%),
    linear-gradient(135deg, rgba(37, 99, 235, 0.06), rgba(124, 58, 237, 0.04)),
    var(--card-bg);
  border-color: rgba(37, 99, 235, 0.18);
}

.topic-tile--featured .topic-viz {
  width: 100%;
  height: 88px;
  flex-direction: column;
  align-items: flex-start;
  justify-content: space-between;
  padding: 14px 16px;
  border-radius: 14px;
}

.topic-tile--featured .case-chip {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: #fff;
  background: linear-gradient(135deg, #6d28d9, #2563eb);
  padding: 4px 10px;
  border-radius: 999px;
}

.topic-tile--featured .topic-num {
  font-size: 64px;
  opacity: 0.1;
  top: 18px;
  right: 22px;
}

.topic-tile--featured h3 {
  font-family: var(--font-serif);
  font-size: clamp(1.25rem, 2vw, 1.55rem);
  padding-right: 56px;
  margin-bottom: 6px;
}

.topic-tile--featured p {
  font-size: 14.5px;
  max-width: 36rem;
  margin-bottom: 10px;
}

.topic-featured-copy {
  position: relative;
  z-index: 1;
}

/* ===== Dictionary ===== */
.dictionary-section {
  margin-bottom: 16px;
  padding: 32px 34px;
  background:
    radial-gradient(ellipse 50% 60% at 0% 0%, rgba(37, 99, 235, 0.1), transparent 55%),
    radial-gradient(ellipse 40% 50% at 100% 100%, rgba(124, 58, 237, 0.07), transparent 50%),
    var(--card-bg);
  position: relative;
}

.dictionary-section::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
}

.dictionary-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 1.15fr);
  gap: 28px;
  align-items: end;
  margin-bottom: 22px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.dictionary-header {
  max-width: 36rem;
}

.dictionary-header h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 2.8vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: 8px;
}

.dictionary-header p {
  font-size: 14px;
  color: var(--text-secondary);
}

.dict-search-wrap {
  position: relative;
  margin-bottom: 0;
}

.dict-search-wrap i {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  font-size: 14px;
  pointer-events: none;
}

#dictSearch {
  width: 100%;
  padding: 18px 18px 18px 48px;
  font-family: var(--font);
  font-size: 15px;
  color: var(--text);
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.4);
}

#dictSearch:focus {
  border-color: var(--blue);
  background: var(--card-bg);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.14);
}

.dict-count {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 12px;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.dict-list {
  list-style: none;
  max-height: 460px;
  overflow-y: auto;
  padding-right: 4px;
}

.dict-item {
  display: grid;
  grid-template-columns: minmax(140px, 220px) 1fr auto;
  gap: 16px;
  align-items: start;
  padding: 16px 14px;
  border: 1px solid transparent;
  border-bottom-color: var(--border);
  border-radius: 12px;
  transition: background 0.15s, border-color 0.15s, transform 0.15s;
}

.dict-item:hover {
  background: var(--input-bg);
  border-color: var(--border);
  transform: translateX(2px);
}

.dict-item.is-hidden {
  display: none;
}

.dict-term {
  font-weight: 700;
  font-size: 14.5px;
  color: var(--text);
  letter-spacing: -0.015em;
  position: relative;
  padding-left: 12px;
}

.dict-term::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.35em;
  width: 3px;
  height: 0.9em;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--gradient-start), var(--gradient-end));
}

.dict-term .dict-alias {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--muted);
  margin-top: 3px;
  padding-left: 0;
}

.dict-def {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.dict-link {
  font-size: 12px;
  font-weight: 600;
  color: var(--blue);
  text-decoration: none;
  white-space: nowrap;
  padding-top: 2px;
}

.dict-link:hover {
  text-decoration: underline;
}

.dict-empty {
  display: none;
  padding: 28px 8px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}

.dict-empty.is-shown {
  display: block;
}

/* ===== Subscribe CTA ===== */
.learn-subscribe {
  margin: 8px 0 0;
  padding: 0;
}

.learn-subscribe-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  padding: 24px 28px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background:
    linear-gradient(160deg, color-mix(in srgb, var(--gradient-start) 10%, var(--card-bg)), var(--card-bg) 55%);
  box-shadow: var(--nav-shadow);
}

.learn-subscribe-copy {
  min-width: 0;
  flex: 1 1 320px;
}

.learn-subscribe-copy h2 {
  font-family: 'Noto Serif TC', 'Noto Sans TC', serif;
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 8px;
}

.learn-subscribe-copy p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
  max-width: 52rem;
}

.learn-subscribe-btn {
  flex: 0 0 auto;
  min-width: 180px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #6d28d9 0%, #2563eb 100%);
  color: #fff;
  border: none;
  padding: 14px 22px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  box-shadow: 0 10px 28px rgba(37, 99, 235, 0.28);
  transition: transform 0.2s, box-shadow 0.2s, filter 0.2s;
}

.learn-subscribe-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 34px rgba(37, 99, 235, 0.36);
  filter: brightness(1.06);
}

/* ===== Footer ===== */
footer {
  text-align: center;
  padding: 32px 0 16px;
  color: var(--muted);
  font-size: 13px;
  border-top: 1px solid var(--border);
}

/* ===== Article reader ===== */
.article-shell {
  max-width: none;
  width: 100%;
  margin: 0 0 16px;
  padding: 28px 32px 32px;
}

.article-shell .article-title,
.article-shell .article-lead,
.article-shell .article-body,
.article-shell .article-disclaimer,
.article-shell .article-nav,
.article-shell .article-crumb,
.article-shell .article-eyebrow {
  max-width: none;
  width: 100%;
}

.article-crumb {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 28px;
}

.article-crumb a {
  color: var(--muted);
  text-decoration: none;
}

.article-crumb a:hover {
  color: var(--blue);
}

.article-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 12px;
}

.article-title {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 3.5vw, 2.35rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 14px;
}

.article-lead {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 36px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border);
}

.article-body {
  border-left: 2px solid var(--border);
  padding-left: 24px;
}

/* In-article visuals */
.viz-panel {
  margin: 8px 0 24px;
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background:
    radial-gradient(ellipse 60% 80% at 100% 0%, rgba(37, 99, 235, 0.08), transparent 55%),
    var(--input-bg);
}

.viz-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
}

.viz-chip {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--blue);
  background: var(--blue-light);
  padding: 3px 8px;
  border-radius: 999px;
}

.viz-chart-fake {
  color: var(--blue);
  margin-bottom: 10px;
}

.viz-chart-fake svg {
  width: 100%;
  height: 72px;
  display: block;
}

.viz-callouts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.viz-callouts span {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 10px;
}

.viz-metric-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.viz-metric-row div {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
}

.viz-metric-row em {
  display: block;
  font-style: normal;
  font-size: 11px;
  color: var(--muted);
  margin-bottom: 4px;
}

.viz-metric-row strong {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text);
}

.viz-list {
  list-style: none;
  display: grid;
  gap: 8px;
  margin: 0;
  font-size: 13px;
  color: var(--text-secondary);
}

.viz-list li {
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--card-bg);
  border: 1px solid var(--border);
}

.viz-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: 10px;
  margin: 0 0 24px;
}

.viz-step {
  padding: 14px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--input-bg);
  text-align: center;
}

.viz-step span {
  display: block;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 600;
  color: var(--blue);
  margin-bottom: 6px;
}

.viz-step p {
  margin: 0 !important;
  font-size: 12px !important;
  color: var(--text-secondary) !important;
}

.dictionary-section .dict-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

@media (min-width: 900px) {
  .dictionary-section .dict-list {
    grid-template-columns: 1fr 1fr;
    gap: 0 20px;
  }

  .dictionary-section .dict-item {
    border-bottom: 1px solid var(--border);
  }
}

.article-body h2 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 32px 0 12px;
  color: var(--text);
}

.article-body h2:first-child {
  margin-top: 0;
}

.article-body p {
  margin-bottom: 14px;
  color: var(--text-secondary);
  font-size: 15.5px;
}

.article-body ul,
.article-body ol {
  margin: 0 0 16px 1.2rem;
  color: var(--text-secondary);
  font-size: 15.5px;
}

.article-body li {
  margin-bottom: 6px;
}

.article-body code,
.article-body .ticker {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--hover-bg);
  padding: 1px 6px;
  border-radius: 4px;
}

.article-callout {
  margin: 24px 0;
  padding: 16px 18px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  font-size: 14px;
  color: var(--text-secondary);
}

.article-callout strong {
  color: var(--text);
  display: block;
  margin-bottom: 4px;
  font-size: 13px;
}

.article-disclaimer {
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--muted);
}

.article-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  align-items: center;
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}

.article-nav a {
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  transition: border-color 0.2s, color 0.2s;
}

.article-nav a:hover {
  color: var(--blue);
  border-color: var(--blue);
}

.article-nav .article-nav-cta {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
}

.article-nav .article-nav-cta:hover {
  color: #fff;
  background: #1d4ed8;
}

/* ===== Responsive ===== */
@media (max-width: 1100px) {
  .topic-grid,
  .topic-grid--advanced {
    grid-template-columns: repeat(2, 1fr);
  }

  .topic-tile--featured {
    grid-column: span 2;
  }

  .reading-path-list {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px 8px;
  }

  .reading-path-list::before {
    display: none;
  }

  .viz-metric-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  body {
    padding: 12px;
  }

  .container {
    padding: 0 8px;
  }

  .navbar {
    margin-bottom: 20px;
    padding: 10px 12px;
    top: 8px;
  }

  .logo-tag {
    display: none;
  }

  .logo-mark {
    width: 38px;
    height: 38px;
    border-radius: 10px;
  }

  .hamburger {
    display: flex;
  }

  .nav-menu {
    display: none;
    width: 100%;
    flex-direction: column;
    order: 3;
    border-radius: 14px;
    padding: 6px;
  }

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

  .nav-controls {
    width: 100%;
    justify-content: flex-end;
  }

  .learn-masthead {
    grid-template-columns: 1fr;
    min-height: 0;
    padding: 28px 20px 32px;
  }

  .masthead-visual {
    min-height: 240px;
    order: -1;
  }

  .hero-stage {
    height: 240px;
    width: min(100%, 360px);
  }

  .dictionary-top {
    grid-template-columns: 1fr;
    align-items: stretch;
  }

  .learn-subscribe-inner {
    padding: 20px;
  }

  .learn-subscribe-btn {
    width: 100%;
  }

  .topic-grid,
  .topic-grid--advanced,
  .reading-path-list {
    grid-template-columns: 1fr;
  }

  .topic-tile--featured {
    grid-column: span 1;
    grid-template-columns: 1fr;
    padding: 22px 20px;
  }

  .topic-tile--featured .topic-viz {
    height: 72px;
  }

  .reading-path-list::before {
    display: none;
  }

  .reading-path-list a {
    flex-direction: row;
    align-items: center;
    padding: 12px 0;
    gap: 14px;
    border-bottom: 1px solid var(--border);
  }

  .track-watermark {
    display: none;
  }

  .viz-metric-row {
    grid-template-columns: 1fr 1fr;
  }

  .dictionary-section,
  .learn-masthead,
  .reading-path,
  .track-band,
  .article-shell {
    padding-left: 18px;
    padding-right: 18px;
  }

  .dict-item {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .article-body {
    border-left: none;
    padding-left: 0;
  }

  .article-nav {
    flex-direction: column;
    align-items: stretch;
  }

  .article-nav a {
    text-align: center;
  }
}