/* ───────── Theme tokens ───────── */
:root {
  --accent: #3B82F6;
  --accent-soft: rgba(59, 130, 246, 0.12);
  --accent-glow: rgba(59, 130, 246, 0.35);
  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 18px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* Dark theme (default) */
:root, [data-theme="dark"] {
  --bg: #0A1020;
  --bg-elev: #0F172A;
  --bg-elev-2: #131C30;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-hover: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text: #F1F5F9;
  --text-dim: #94A3B8;
  --text-muted: #64748B;
  --grid-line: rgba(255, 255, 255, 0.04);
  --noise-opacity: 0.04;
}

[data-theme="light"] {
  --bg: #FAFAF7;
  --bg-elev: #FFFFFF;
  --bg-elev-2: #F4F4EC;
  --surface: rgba(10, 37, 64, 0.04);
  --surface-hover: rgba(10, 37, 64, 0.07);
  --border: rgba(10, 37, 64, 0.10);
  --border-strong: rgba(10, 37, 64, 0.18);
  --text: #0A2540;
  --text-dim: #475569;
  --text-muted: #64748B;
  --grid-line: rgba(10, 37, 64, 0.05);
  --noise-opacity: 0.025;
}

/* ───────── Reset ───────── */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: 'Inter Tight', 'Inter', ui-sans-serif, system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: 'ss01', 'cv11';
  transition: background 0.5s var(--ease), color 0.5s var(--ease);
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: default; }
img { max-width: 100%; display: block; }

/* ───────── Background grain + soft glow ───────── */
.bg-decor {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
.bg-decor::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 20% 0%, var(--accent-soft), transparent 60%),
    radial-gradient(ellipse 50% 40% at 85% 12%, color-mix(in srgb, var(--accent) 18%, transparent), transparent 60%);
  opacity: 0.7;
}
.bg-decor::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence baseFrequency='0.9' numOctaves='2' seed='5'/><feColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.6 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  opacity: var(--noise-opacity);
  mix-blend-mode: overlay;
}

/* ───────── Layout ───────── */
.app {
  position: relative;
  z-index: 1;
  min-height: 100vh;
}
.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 32px;
}
@media (max-width: 720px) {
  .container { padding: 0 20px; }
}

/* ───────── Nav ───────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  border-bottom: 1px solid var(--border);
  transition: background 0.4s var(--ease);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 24px;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.01em;
  white-space: nowrap;
  flex-shrink: 0;
}
.nav-brand-name { white-space: nowrap; }
.nav-brand-sub { white-space: nowrap; }
@media (max-width: 1100px) {
  .nav-brand-sub { display: none; }
}
.nav-mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--accent);
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 700;
  font-size: 13px;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  box-shadow: 0 0 0 1px var(--border-strong), 0 6px 20px var(--accent-glow);
}
.nav-links {
  display: flex;
  gap: 4px;
  align-items: center;
}
.nav-link {
  padding: 7px 12px;
  border-radius: 8px;
  font-size: 13.5px;
  color: var(--text-dim);
  transition: all 0.2s var(--ease);
  position: relative;
}
.nav-link:hover { color: var(--text); background: var(--surface); }
.nav-link.active { color: var(--text); }
.nav-link.active::after {
  content: '';
  position: absolute;
  left: 12px; right: 12px; bottom: 2px;
  height: 1.5px;
  background: var(--accent);
  border-radius: 2px;
}
.nav-actions { display: flex; gap: 8px; align-items: center; }

/* Theme toggle */
.theme-toggle {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-dim);
  display: grid;
  place-items: center;
  transition: all 0.25s var(--ease);
}
.theme-toggle:hover { color: var(--text); border-color: var(--border-strong); }
.theme-toggle svg { width: 16px; height: 16px; }

/* Search trigger */
.search-trigger {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 12px;
  height: 34px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  font-size: 13px;
  min-width: 220px;
  white-space: nowrap;
  flex-shrink: 0;
  transition: all 0.25s var(--ease);
}
.search-trigger > span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
@media (max-width: 1100px) {
  .search-trigger { min-width: 0; padding: 0 10px; }
  .search-trigger > span { display: none; }
  .search-trigger kbd { margin-left: 4px; }
}
@media (max-width: 720px) {
  .search-trigger kbd { display: none; }
}
.search-trigger:hover { border-color: var(--border-strong); color: var(--text-dim); }
.search-trigger svg { width: 14px; height: 14px; }
.search-trigger kbd {
  margin-left: auto;
  font-size: 10.5px;
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-muted);
  font-family: 'JetBrains Mono', ui-monospace, monospace;
}

/* ───────── Hub (clean home page) ───────── */
.hub {
  min-height: calc(100vh - 80px);
  display: flex;
  align-items: center;
  padding: 80px 0;
}
.hub-intro {
  margin-bottom: 64px;
  max-width: 720px;
}
.hub-name {
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1;
  margin-bottom: 12px;
}
.hub-affil {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  text-transform: uppercase;
}
.hub-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
@media (max-width: 720px) { .hub-grid { grid-template-columns: 1fr; } }

.hub-card {
  background: var(--bg);
  padding: 44px 40px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  position: relative;
  cursor: default;
  min-height: 220px;
  transition: background 0.35s var(--ease);
  opacity: 0;
  transform: translateY(16px);
  animation: fadeUp 0.7s var(--ease-out) forwards;
}
.hub-card:hover { background: var(--bg-elev); }
.hub-card-kicker {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--text-muted);
}
.hub-card-label {
  font-size: clamp(28px, 3vw, 38px);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.05;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.hub-card-arrow {
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  display: grid;
  place-items: center;
  color: var(--text-dim);
  flex: none;
  transition: all 0.35s var(--ease);
}
.hub-card-arrow svg { width: 14px; height: 14px; }
.hub-card:hover .hub-card-arrow {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  transform: rotate(-45deg) scale(1.05);
}
.hub-card-desc {
  color: var(--text-dim);
  font-size: 14.5px;
  line-height: 1.55;
  max-width: 38ch;
  flex: 1;
}
.hub-card-meta {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-top: auto;
}
.hub-foot {
  margin-top: 48px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 12.5px;
  color: var(--text-muted);
}
.hub-foot-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: color 0.2s var(--ease);
}
.hub-foot-link:hover { color: var(--text); }
.hub-foot-link svg { width: 13px; height: 13px; }
.hub-foot-sep {
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--text-muted);
  opacity: 0.4;
}

/* ───────── Type utilities ───────── */
.kicker {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.kicker::before {
  content: '';
  width: 18px; height: 1px;
  background: currentColor;
  opacity: 0.5;
}
.eyebrow {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.section-title {
  font-size: clamp(40px, 6vw, 76px);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.0;
  margin: 0;
}

/* ───────── Hero ───────── */
.hero {
  padding: 100px 0 80px;
  position: relative;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 12px 6px 8px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 12.5px;
  color: var(--text-dim);
  margin-bottom: 32px;
}
.hero-tag-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: #10B981;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.18);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.18); }
  50% { box-shadow: 0 0 0 5px rgba(16, 185, 129, 0.10); }
}
.hero-title {
  font-size: clamp(56px, 9vw, 132px);
  font-weight: 600;
  line-height: 0.92;
  letter-spacing: -0.045em;
  margin: 0 0 32px;
  color: var(--text);
}
.hero-title .accent {
  color: var(--accent);
  font-style: italic;
  font-weight: 500;
}
.hero-title .strike {
  position: relative;
  display: inline-block;
}
.hero-lede {
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.55;
  color: var(--text-dim);
  max-width: 680px;
  margin: 0 0 40px;
  font-weight: 400;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  margin-bottom: 40px;
  font-size: 13px;
  color: var(--text-muted);
}
.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
}
.hero-meta-item svg { width: 13px; height: 13px; }

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

/* ───────── Buttons ───────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 18px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.005em;
  transition: all 0.25s var(--ease);
}
.btn:hover { background: var(--surface-hover); transform: translateY(-1px); }
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 6px 24px -4px var(--accent-glow);
}
.btn-primary:hover {
  background: color-mix(in srgb, var(--accent) 88%, white);
  box-shadow: 0 10px 32px -4px var(--accent-glow);
}
.btn svg { width: 14px; height: 14px; }

/* ───────── Hero stats strip ───────── */
.stats-strip {
  margin-top: 64px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.stat {
  padding: 28px 24px;
  border-right: 1px solid var(--border);
  position: relative;
  transition: background 0.3s var(--ease);
}
.stat:last-child { border-right: none; }
.stat:hover { background: var(--surface); }
.stat-num {
  font-size: 44px;
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1;
  display: flex;
  align-items: baseline;
  gap: 4px;
}
.stat-num .suffix {
  font-size: 22px;
  color: var(--accent);
}
.stat-label {
  margin-top: 8px;
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
@media (max-width: 720px) {
  .stats-strip { grid-template-columns: repeat(2, 1fr); }
  .stat { border-bottom: 1px solid var(--border); }
  .stat:nth-child(2) { border-right: none; }
}

/* ───────── Section spacing ───────── */
.section {
  padding: 100px 0;
  position: relative;
}
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 56px;
  flex-wrap: wrap;
}
.section-head-left { max-width: 720px; }
.section-head .kicker { margin-bottom: 16px; display: inline-flex; }
.section-desc {
  margin-top: 18px;
  color: var(--text-dim);
  font-size: 17px;
  line-height: 1.55;
  max-width: 560px;
}

/* ───────── Discipline cards ───────── */
.disc-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
@media (max-width: 720px) { .disc-grid { grid-template-columns: 1fr; } }

.disc-card {
  background: var(--bg);
  padding: 36px 32px;
  cursor: default;
  position: relative;
  transition: background 0.3s var(--ease);
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 240px;
}
.disc-card:hover { background: var(--bg-elev); }
.disc-card-arrow {
  position: absolute;
  top: 32px;
  right: 32px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  display: grid;
  place-items: center;
  color: var(--text-dim);
  transition: all 0.3s var(--ease);
}
.disc-card:hover .disc-card-arrow {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  transform: rotate(-45deg);
}
.disc-card-code {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}
.disc-card-name {
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.1;
  margin: 0;
  max-width: 80%;
}
.disc-card-desc {
  color: var(--text-dim);
  font-size: 14.5px;
  line-height: 1.5;
  margin: 0;
  flex: 1;
}
.disc-card-meta {
  display: flex;
  gap: 20px;
  font-size: 12px;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  margin-top: auto;
}
.disc-card-meta span { display: flex; align-items: center; gap: 6px; }
.disc-card-meta strong { color: var(--text); font-weight: 500; }

/* ───────── Materials list ───────── */
.materials-controls {
  display: flex;
  gap: 12px;
  margin-bottom: 32px;
  flex-wrap: wrap;
  align-items: center;
}
.search-input-wrap {
  flex: 1;
  min-width: 280px;
  position: relative;
}
.search-input {
  width: 100%;
  height: 46px;
  padding: 0 16px 0 44px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 14.5px;
  font-family: inherit;
  outline: none;
  transition: all 0.25s var(--ease);
}
.search-input:focus { border-color: var(--accent); background: var(--bg-elev); box-shadow: 0 0 0 4px var(--accent-soft); }
.search-input::placeholder { color: var(--text-muted); }
.search-input-wrap svg {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--text-muted);
  pointer-events: none;
}

.filter-chips {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.chip {
  padding: 8px 14px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-dim);
  font-size: 12.5px;
  letter-spacing: -0.005em;
  transition: all 0.2s var(--ease);
  display: inline-flex;
  align-items: center;
  gap: 7px;
}
.chip:hover { color: var(--text); border-color: var(--border-strong); }
.chip.active {
  background: var(--text);
  border-color: var(--text);
  color: var(--bg);
}
.chip-count {
  font-size: 11px;
  opacity: 0.65;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
}

/* Material rows */
.material-list {
  border-top: 1px solid var(--border);
}
.material-row {
  display: grid;
  grid-template-columns: 56px 1fr auto auto auto;
  align-items: center;
  gap: 24px;
  padding: 20px 12px;
  border-bottom: 1px solid var(--border);
  transition: all 0.25s var(--ease);
  position: relative;
}
.material-row:hover { background: var(--surface); padding-left: 20px; }
.material-row::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 0;
  background: var(--accent);
  transition: width 0.3s var(--ease);
}
.material-row:hover::before { width: 3px; }

.material-icon {
  width: 44px;
  height: 56px;
  border-radius: 6px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  position: relative;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 9px;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.1em;
}
.material-icon::after {
  content: '';
  position: absolute;
  top: 0; right: 0;
  border-style: solid;
  border-width: 0 12px 12px 0;
  border-color: transparent var(--bg) transparent var(--border);
}
.material-icon.t-apostila { background: linear-gradient(135deg, #1e3a8a, #1e40af); color: #93c5fd; border-color: #1e40af; }
.material-icon.t-slides { background: linear-gradient(135deg, #831843, #9d174d); color: #fbcfe8; border-color: #9d174d; }
.material-icon.t-codigo { background: linear-gradient(135deg, #064e3b, #065f46); color: #6ee7b7; border-color: #065f46; }

.material-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}
.material-title {
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--text);
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.material-tags {
  display: flex;
  gap: 6px;
  font-size: 11.5px;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', ui-monospace, monospace;
}
.material-tag {
  padding: 2px 7px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
}
.material-tag:hover { color: var(--text); border-color: var(--border-strong); }
.material-disc, .material-date, .material-size {
  font-size: 12.5px;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  white-space: nowrap;
}
.material-disc { color: var(--accent); }

@media (max-width: 720px) {
  .material-row { grid-template-columns: 44px 1fr auto; gap: 14px; }
  .material-disc, .material-size { display: none; }
}

/* PDF preview floater */
.pdf-preview {
  position: fixed;
  pointer-events: none;
  z-index: 100;
  width: 220px;
  height: 290px;
  border-radius: 8px;
  background: var(--bg-elev);
  border: 1px solid var(--border-strong);
  box-shadow: 0 24px 60px rgba(0,0,0,0.4), 0 0 0 1px rgba(255,255,255,0.04);
  overflow: hidden;
  opacity: 0;
  transform: translateY(8px) scale(0.96);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
  padding: 14px;
}
.pdf-preview.visible { opacity: 1; transform: translateY(0) scale(1); }
.pdf-preview-line {
  height: 2px;
  background: var(--text);
  margin-bottom: 6px;
  border-radius: 1px;
  opacity: 0.85;
}
.pdf-preview-line.short { width: 60%; }
.pdf-preview-line.med { width: 80%; }
.pdf-preview-line.title {
  height: 6px;
  width: 70%;
  margin-bottom: 14px;
  background: var(--accent);
}
.pdf-preview-line.faded { opacity: 0.35; }
.pdf-preview-pageno {
  position: absolute;
  bottom: 10px;
  right: 12px;
  font-size: 9.5px;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  color: var(--text-muted);
  letter-spacing: 0.1em;
}

/* ───────── Publications ───────── */
.pub-list {
  display: flex;
  flex-direction: column;
}
.pub-year-group { padding: 32px 0; border-bottom: 1px solid var(--border); }
.pub-year-group:first-child { padding-top: 0; }
.pub-year {
  font-size: 13px;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  margin-bottom: 24px;
}
.pub-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  padding: 18px 0;
  border-top: 1px solid var(--border);
  align-items: start;
  transition: padding 0.25s var(--ease);
  cursor: default;
}
.pub-item:hover { padding-left: 12px; }
.pub-item:hover .pub-title { color: var(--accent); }
.pub-item:first-child { border-top: none; padding-top: 0; }
.pub-title {
  font-size: 19px;
  font-weight: 500;
  letter-spacing: -0.015em;
  line-height: 1.35;
  margin: 0 0 8px;
  transition: color 0.25s var(--ease);
}
.pub-meta {
  font-size: 13px;
  color: var(--text-dim);
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}
.pub-venue { color: var(--text); font-weight: 500; }
.pub-authors {
  color: var(--text-muted);
  font-size: 12.5px;
  margin-top: 4px;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
}
.pub-type {
  font-size: 11px;
  padding: 3px 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  white-space: nowrap;
}
.pub-doi {
  font-size: 12px;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  align-self: start;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.pub-doi:hover { color: var(--accent); }
.pub-doi svg { width: 11px; height: 11px; }

/* ───────── Discipline detail page ───────── */
.disc-hero {
  padding: 80px 0 60px;
  border-bottom: 1px solid var(--border);
}
.disc-hero-code {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 24px;
}
.disc-hero-title {
  font-size: clamp(48px, 7vw, 96px);
  font-weight: 600;
  line-height: 0.95;
  letter-spacing: -0.04em;
  margin: 0 0 32px;
  max-width: 16ch;
}
.disc-hero-lede {
  font-size: 18px;
  color: var(--text-dim);
  max-width: 640px;
  line-height: 1.55;
}
.disc-hero-meta {
  margin-top: 40px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  padding-top: 32px;
  border-top: 1px dashed var(--border-strong);
}
@media (max-width: 720px) { .disc-hero-meta { grid-template-columns: repeat(2, 1fr); } }
.dhm-label { font-size: 11px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-muted); margin-bottom: 8px; font-family: 'JetBrains Mono', ui-monospace, monospace; }
.dhm-value { font-size: 22px; font-weight: 600; letter-spacing: -0.02em; }

.topic-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}
.topic-chip {
  padding: 7px 14px;
  border-radius: 100px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 12.5px;
  font-weight: 500;
  border: 1px solid transparent;
  transition: all 0.2s var(--ease);
}
.topic-chip:hover {
  background: var(--accent);
  color: #fff;
}

/* ───────── Comments ───────── */
.comments {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
}
.comment-input {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
}
.comment-avatar {
  width: 36px; height: 36px; flex: none;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  display: grid;
  place-items: center;
  font-weight: 600;
  font-size: 13px;
}
.comment-textarea {
  flex: 1;
  min-height: 80px;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  font-size: 14px;
  resize: vertical;
  outline: none;
  transition: border-color 0.2s var(--ease);
}
.comment-textarea:focus { border-color: var(--accent); }
.comment-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 8px; }

.comment-list { display: flex; flex-direction: column; gap: 20px; }
.comment {
  display: flex;
  gap: 12px;
  padding: 16px 0;
  border-top: 1px solid var(--border);
  animation: fadeUp 0.5s var(--ease) backwards;
}
.comment-body { flex: 1; }
.comment-head {
  display: flex;
  gap: 10px;
  align-items: baseline;
  margin-bottom: 6px;
}
.comment-author { font-weight: 500; font-size: 14px; }
.comment-when { font-size: 11.5px; color: var(--text-muted); font-family: 'JetBrains Mono', ui-monospace, monospace; }
.comment-text { color: var(--text-dim); font-size: 14px; line-height: 1.55; }
.comment-tools { display: flex; gap: 14px; margin-top: 8px; font-size: 12px; color: var(--text-muted); }
.comment-tools button {
  appearance: none;
  background: none;
  border: none;
  color: inherit;
  font: inherit;
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 0;
  transition: color 0.2s var(--ease);
}
.comment-tools button:hover { color: var(--accent); }

/* ───────── Footer ───────── */
.footer {
  margin-top: 80px;
  padding: 60px 0 40px;
  border-top: 1px solid var(--border);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
@media (max-width: 720px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; } }
.footer-col h4 { font-size: 11px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-muted); margin: 0 0 16px; font-family: 'JetBrains Mono', ui-monospace, monospace; font-weight: 500; }
.footer-col a { display: block; padding: 4px 0; color: var(--text-dim); font-size: 14px; transition: color 0.2s var(--ease); }
.footer-col a:hover { color: var(--text); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}

/* ───────── Animations ───────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}
.reveal.in { opacity: 1; transform: translateY(0); }

/* ───────── Direction variants ───────── */
/* B: Tech — denser, more mono, slightly more "developer" */
[data-direction="tech"] {
  --radius: 6px;
  --radius-lg: 10px;
}
[data-direction="tech"] .hero-title { font-family: 'JetBrains Mono', ui-monospace, monospace; font-weight: 500; letter-spacing: -0.02em; font-size: clamp(40px, 6vw, 88px); line-height: 1; }
[data-direction="tech"] .hero-title .accent { font-style: normal; }
[data-direction="tech"] .section-title { font-family: 'JetBrains Mono', ui-monospace, monospace; font-weight: 500; letter-spacing: -0.02em; font-size: clamp(32px, 5vw, 56px); }
[data-direction="tech"] .disc-card-name { font-family: 'JetBrains Mono', ui-monospace, monospace; font-size: 24px; letter-spacing: -0.015em; }
[data-direction="tech"] .disc-hero-title { font-family: 'JetBrains Mono', ui-monospace, monospace; font-size: clamp(36px, 6vw, 72px); letter-spacing: -0.025em; }
[data-direction="tech"] .nav-mark { border-radius: 4px; }
[data-direction="tech"] .btn { border-radius: 6px; }
[data-direction="tech"] .chip { border-radius: 4px; }
[data-direction="tech"] .topic-chip { border-radius: 4px; font-family: 'JetBrains Mono', ui-monospace, monospace; }

/* C: Soft — more rounded, more space, more poetic */
[data-direction="soft"] {
  --radius: 16px;
  --radius-lg: 28px;
}
[data-direction="soft"] body { font-family: 'Instrument Sans', ui-sans-serif, system-ui, sans-serif; }
[data-direction="soft"] .hero-title { font-family: 'Instrument Serif', serif; font-weight: 400; letter-spacing: -0.02em; }
[data-direction="soft"] .hero-title .accent { font-family: 'Instrument Serif', serif; font-style: italic; }
[data-direction="soft"] .section-title { font-family: 'Instrument Serif', serif; font-weight: 400; letter-spacing: -0.015em; }
[data-direction="soft"] .disc-card { padding: 44px 36px; border-radius: 0; }
[data-direction="soft"] .disc-card-name { font-family: 'Instrument Serif', serif; font-weight: 400; letter-spacing: -0.015em; font-size: 32px; }
[data-direction="soft"] .disc-hero-title { font-family: 'Instrument Serif', serif; font-weight: 400; letter-spacing: -0.02em; }
[data-direction="soft"] .pub-title { font-family: 'Instrument Serif', serif; font-weight: 400; font-size: 22px; letter-spacing: -0.005em; }
[data-direction="soft"] .nav-mark { border-radius: 50%; }
[data-direction="soft"] .btn { border-radius: 100px; }

/* ───────── Lessons section ───────── */
.lessons-wrap {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.lessons-featured {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
@media (max-width: 900px) {
  .lessons-featured { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .lessons-featured { grid-template-columns: 1fr; }
}

.lesson-card {
  padding: 24px 22px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-strong);
  background: var(--bg-elev);
  cursor: default;
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 160px;
}
.lesson-card:hover {
  background: var(--bg-elev-2);
  border-color: var(--accent);
}
.lesson-card-current {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent), 0 8px 32px -6px var(--accent-glow);
  animation: lessonGlow 3s ease-in-out infinite;
}
@keyframes lessonGlow {
  0%, 100% { box-shadow: 0 0 0 1px var(--accent), 0 8px 32px -6px var(--accent-glow); }
  50% { box-shadow: 0 0 0 1px var(--accent), 0 12px 40px -4px var(--accent-glow); }
}
.lesson-card-upcoming {
  background: var(--bg);
}

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

.lesson-num {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

.lesson-card-title {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin: 0;
  color: var(--text);
  flex: 1;
}

.lesson-status-pill {
  font-size: 9.5px;
  font-weight: 700;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  border-radius: 100px;
  text-transform: uppercase;
  white-space: nowrap;
  flex-shrink: 0;
}
.ls-current {
  background: var(--accent);
  color: #fff;
}
.ls-upcoming {
  background: var(--surface);
  border: 1px solid var(--border-strong);
  color: var(--text-muted);
}
.ls-done {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.lesson-topics {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.lesson-topics li {
  font-size: 12.5px;
  color: var(--text-dim);
  padding-left: 14px;
  position: relative;
  line-height: 1.4;
}
.lesson-topics li::before {
  content: '·';
  position: absolute;
  left: 2px;
  color: var(--accent);
  font-weight: 700;
}

/* Lesson list (done rows) */
.lessons-list {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.lesson-row-wrap {
  border-bottom: 1px solid var(--border);
  cursor: default;
  transition: background 0.2s var(--ease);
}
.lesson-row-wrap:last-child { border-bottom: none; }
.lesson-row-wrap:hover { background: var(--surface); }

.lesson-row {
  display: grid;
  grid-template-columns: 36px 1fr auto;
  gap: 14px;
  padding: 13px 20px;
  align-items: center;
}

.lesson-num-sm {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}
.lesson-row-title {
  font-size: 13.5px;
  color: var(--text-dim);
  line-height: 1.35;
}
.lesson-row-done .lesson-row-title,
.lesson-row-wrap.lesson-row-done .lesson-row-title {
  color: var(--text-muted);
}

.lesson-topics-panel {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 0 20px 12px 70px;
}
@media (max-width: 560px) {
  .lesson-topics-panel { padding: 0 16px 12px 16px; }
}

.lesson-topic-chip {
  font-size: 11.5px;
  color: var(--text-muted);
  padding: 3px 9px;
  border-radius: 5px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  letter-spacing: 0.01em;
}

/* Summary/progress bar */
.lessons-summary-bar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 20px;
  border-radius: var(--radius);
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.2);
  color: var(--text-dim);
}
.lessons-progress {
  flex: 1;
  height: 5px;
  background: rgba(245, 158, 11, 0.15);
  border-radius: 3px;
  overflow: hidden;
}
.lessons-progress-fill {
  height: 100%;
  background: #F59E0B;
  border-radius: 3px;
  transition: width 1s var(--ease-out);
}

/* ───────── Mobile nav adjustments ───────── */
@media (max-width: 680px) {
  .hero { padding: 88px 0 64px; }
  .disc-hero { padding: 80px 0 48px; }
  .section { padding: 64px 0; }
  .hub { padding: 72px 0; }
}

/* Density */
[data-density="compact"] .section { padding: 64px 0; }
[data-density="compact"] .hero { padding: 72px 0 56px; }
[data-density="compact"] .material-row { padding: 14px 12px; }
[data-density="comfy"] .section { padding: 140px 0; }
[data-density="comfy"] .hero { padding: 140px 0 110px; }
[data-density="comfy"] .material-row { padding: 26px 12px; }