/* ===== QUANTUM RESEARCH HUB — Design Tokens ===== */
:root {
  /* Type Scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Fonts */
  --font-display: 'Cabinet Grotesk', 'Inter', sans-serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
}

/* ===== DARK THEME (Default) ===== */
:root, [data-theme="dark"] {
  --color-bg:             #0a0c14;
  --color-surface:        #0f1220;
  --color-surface-2:      #141829;
  --color-surface-offset: #1a1f33;
  --color-surface-dynamic: #222840;
  --color-divider:        #2a3050;
  --color-border:         #333a58;

  --color-text:           #e0e4f0;
  --color-text-muted:     #8890aa;
  --color-text-faint:     #555e7a;
  --color-text-inverse:   #0a0c14;

  /* Cyan accent */
  --color-primary:        #00d4ff;
  --color-primary-hover:  #33ddff;
  --color-primary-active: #0099cc;
  --color-primary-dim:    rgba(0, 212, 255, 0.12);

  /* Violet secondary */
  --color-secondary:      #a855f7;
  --color-secondary-dim:  rgba(168, 85, 247, 0.12);

  /* Green for positive metrics */
  --color-success:        #34d399;
  --color-success-dim:    rgba(52, 211, 153, 0.12);

  /* Amber for warnings */
  --color-warning:        #fbbf24;
  --color-warning-dim:    rgba(251, 191, 36, 0.12);

  /* Rose for emphasis */
  --color-rose:           #fb7185;
  --color-rose-dim:       rgba(251, 113, 133, 0.12);

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.5);
}

/* ===== LIGHT THEME ===== */
[data-theme="light"] {
  --color-bg:             #f4f5f9;
  --color-surface:        #ffffff;
  --color-surface-2:      #f8f9fc;
  --color-surface-offset: #eceef4;
  --color-surface-dynamic: #e2e5ef;
  --color-divider:        #d0d4e0;
  --color-border:         #b8bdd0;

  --color-text:           #1a1d2e;
  --color-text-muted:     #5a6080;
  --color-text-faint:     #9098b0;
  --color-text-inverse:   #f4f5f9;

  --color-primary:        #0088aa;
  --color-primary-hover:  #006688;
  --color-primary-active: #004466;
  --color-primary-dim:    rgba(0, 136, 170, 0.08);

  --color-secondary:      #7c3aed;
  --color-secondary-dim:  rgba(124, 58, 237, 0.08);

  --color-success:        #059669;
  --color-success-dim:    rgba(5, 150, 105, 0.08);

  --color-warning:        #d97706;
  --color-warning-dim:    rgba(217, 119, 6, 0.08);

  --color-rose:           #e11d48;
  --color-rose-dim:       rgba(225, 29, 72, 0.08);

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);
}

/* ===== HEADER ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--color-bg) 85%, transparent);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-divider);
  padding: var(--space-3) var(--space-6);
}
.header-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}
.logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--color-text);
}
.logo-lockup {
  flex-shrink: 0;
  display: block;
  height: 26px;
  width: auto;
  transition: opacity 0.2s;
}
[data-theme='light'] .logo-lockup { filter: invert(1); }
.logo:hover .logo-lockup { opacity: 0.8; }

.header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}
.header-nav a {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  font-weight: 500;
}
.header-nav a:hover {
  color: var(--color-text);
  background: var(--color-primary-dim);
}

.theme-toggle {
  padding: var(--space-2);
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
}
.theme-toggle:hover { color: var(--color-primary); }

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: var(--space-16) var(--space-6);
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
}
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 40%, var(--color-bg));
}
.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
}
.hero-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: var(--space-4);
}
.hero h1 {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  letter-spacing: -0.02em;
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto var(--space-8);
  line-height: 1.6;
}
.hero-meta {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-family: var(--font-mono);
}

/* ===== CATEGORY NAVIGATION ===== */
.cat-nav {
  padding: var(--space-6);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-divider);
  position: sticky;
  top: 3.25rem;
  z-index: 90;
}
.cat-nav-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  display: flex;
  gap: var(--space-2);
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  padding-bottom: var(--space-1);
}
.cat-nav-inner::-webkit-scrollbar { display: none; }
.cat-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-lg);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  white-space: nowrap;
  border: 1px solid transparent;
  background: transparent;
}
.cat-btn:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}
.cat-btn.active {
  color: var(--color-primary);
  background: var(--color-primary-dim);
  border-color: color-mix(in srgb, var(--color-primary) 30%, transparent);
}
.cat-btn svg { width: 18px; height: 18px; flex-shrink: 0; }

/* ===== MAIN CONTENT ===== */
.main {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: var(--space-10) var(--space-6) var(--space-24);
}

/* ===== CATEGORY SECTION ===== */
.category-section {
  margin-bottom: var(--space-16);
  scroll-margin-top: 8rem;
}
.category-header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-divider);
}
.category-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.category-icon svg {
  width: 24px;
  height: 24px;
}
.category-header h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
}
.category-header p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

/* ===== STAT OF ART CARDS ===== */
.sota-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}
.sota-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: border-color 180ms ease, box-shadow 180ms ease;
}
.sota-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary), var(--shadow-md);
}
.sota-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}
.sota-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
}
.sota-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  font-weight: 600;
  letter-spacing: 0.03em;
}
.sota-badge.leader { background: var(--color-primary-dim); color: var(--color-primary); }
.sota-badge.emerging { background: var(--color-secondary-dim); color: var(--color-secondary); }
.sota-badge.milestone { background: var(--color-success-dim); color: var(--color-success); }
.sota-badge.warning { background: var(--color-warning-dim); color: var(--color-warning); }

.sota-card-body { margin-bottom: var(--space-4); }
.sota-card-body p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* Metric rows */
.metrics-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-4);
}
.metric {
  background: var(--color-surface-offset);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-3);
  min-width: 0;
}
.metric-label {
  font-size: 0.7rem;
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-family: var(--font-mono);
}
.metric-value {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* Key papers / links */
.sota-links {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-divider);
}
.sota-links h4 {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-2);
  font-family: var(--font-mono);
}
.sota-links ul {
  list-style: none;
  padding: 0;
}
.sota-links li {
  padding: var(--space-1) 0;
}
.sota-links a {
  font-size: var(--text-xs);
  color: var(--color-primary);
  text-decoration: none;
}
.sota-links a:hover { text-decoration: underline; }
.sota-links .paper-meta {
  font-size: 0.7rem;
  color: var(--color-text-faint);
  font-family: var(--font-mono);
}

/* ===== INSTITUTION CARDS ===== */
.inst-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-6);
}
.inst-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: border-color 180ms ease;
}
.inst-card:hover { border-color: var(--color-secondary); }
.inst-card h4 {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.inst-card p {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.55;
}
.inst-tag {
  display: inline-block;
  font-size: 0.65rem;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  background: var(--color-surface-offset);
  color: var(--color-text-muted);
  margin-top: var(--space-2);
  margin-right: var(--space-1);
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ===== COMPARISON TABLES ===== */
.table-wrapper {
  overflow-x: auto;
  margin: var(--space-6) 0;
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
}
.table-wrapper table {
  font-size: var(--text-xs);
  white-space: nowrap;
}
.table-wrapper th {
  background: var(--color-surface-offset);
  padding: var(--space-3) var(--space-4);
  text-align: left;
  font-weight: 700;
  color: var(--color-text);
  font-family: var(--font-mono);
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--color-divider);
}
.table-wrapper td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-divider);
  color: var(--color-text-muted);
}
.table-wrapper tr:last-child td { border-bottom: none; }
.table-wrapper tr:hover td { background: var(--color-surface-offset); }
.table-wrapper td:first-child {
  font-weight: 600;
  color: var(--color-text);
}

/* ===== ECOSYSTEM / COMPANY CARDS ===== */
.eco-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-5);
}
.eco-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: border-color 180ms ease;
}
.eco-card:hover { border-color: var(--color-primary); }
.eco-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-3);
}
.eco-card h4 {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text);
}
.eco-card-cat {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--color-secondary);
  background: var(--color-secondary-dim);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.eco-card p {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.55;
  margin-bottom: var(--space-3);
}
.eco-card a {
  font-size: var(--text-xs);
  color: var(--color-primary);
  text-decoration: none;
}
.eco-card a:hover { text-decoration: underline; }

/* ===== SECTION DIVIDER ===== */
.section-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-divider), transparent);
  margin: var(--space-12) 0;
}

/* ===== SUBSECTION ===== */
.subsection {
  margin-bottom: var(--space-10);
}
.subsection h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.subsection h3 .accent-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
  flex-shrink: 0;
}

/* ===== FOOTER ===== */
.footer {
  border-top: 1px solid var(--color-divider);
  padding: var(--space-8) var(--space-6);
  text-align: center;
}
.footer p {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  max-width: none;
}
.footer a {
  color: var(--color-text-muted);
  text-decoration: none;
}
.footer a:hover {
  color: var(--color-primary);
}

/* ===== MOBILE ===== */
@media (max-width: 768px) {
  .header-nav { display: none; }
  .hero { min-height: 50vh; padding: var(--space-10) var(--space-4); }
  .hero h1 { font-size: var(--text-2xl); }
  .cat-nav { padding: var(--space-3) var(--space-4); top: 3rem; }
  .cat-btn { font-size: var(--text-xs); padding: var(--space-2) var(--space-3); }
  .main { padding: var(--space-6) var(--space-4) var(--space-16); }
  .sota-grid { grid-template-columns: 1fr; }
  .eco-grid { grid-template-columns: 1fr; }
  .inst-grid { grid-template-columns: 1fr 1fr; }
  .metrics-row { gap: var(--space-2); }
}
@media (max-width: 480px) {
  .inst-grid { grid-template-columns: 1fr; }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.category-section {
  animation: fadeUp 0.4s ease both;
}

/* Giant players grid */
.giant-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-5);
}
.giant-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: border-color 180ms ease, box-shadow 180ms ease;
}
.giant-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}
.giant-card h4 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}
.giant-card p {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.6;
}
.giant-card .milestone-list {
  list-style: none;
  padding: 0;
  margin-top: var(--space-3);
}
.giant-card .milestone-list li {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  padding: var(--space-1) 0;
  padding-left: var(--space-4);
  position: relative;
  max-width: none;
}
.giant-card .milestone-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  transform: translateY(-50%);
}

/* Timeline section */
.timeline-container {
  margin: var(--space-8) 0;
  position: relative;
  padding-left: var(--space-8);
}
.timeline-container::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-primary), var(--color-secondary));
}
.timeline-item {
  position: relative;
  margin-bottom: var(--space-6);
  padding-left: var(--space-4);
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-8) + 10px);
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 2px solid var(--color-bg);
}
.timeline-date {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  margin-bottom: var(--space-1);
}
.timeline-item h4 {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}
.timeline-item p {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  width: 44px;
  height: 44px;
  border-radius: var(--radius-lg);
  background: var(--color-primary);
  color: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  box-shadow: var(--shadow-lg);
}
.back-to-top.visible {
  opacity: 1;
  pointer-events: all;
}

/* ===== NEWS TICKER ===== */
.news-ticker {
  display: flex;
  align-items: center;
  background: var(--color-surface-2);
  border-bottom: 1px solid var(--color-divider);
  overflow: hidden;
  height: 40px;
}
.ticker-label {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0 var(--space-4);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #ff4444;
  background: var(--color-surface);
  height: 100%;
  border-right: 1px solid var(--color-divider);
  position: relative;
}
.ticker-label svg { color: #ff4444; }
.ticker-label::after {
  content: '';
  position: absolute;
  left: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #ff4444;
  animation: ticker-pulse 1.5s ease-in-out infinite;
}
.ticker-label svg, .ticker-label { padding-left: var(--space-4); }
@keyframes ticker-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}
.ticker-track {
  flex: 1;
  overflow: hidden;
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
  mask-image: linear-gradient(to right, transparent, black 40px, black calc(100% - 40px), transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, black 40px, black calc(100% - 40px), transparent);
}
.ticker-content {
  display: flex;
  gap: var(--space-8);
  white-space: nowrap;
  animation: ticker-scroll 90s linear infinite;
  will-change: transform;
}
.ticker-content:hover { animation-play-state: paused; }
@keyframes ticker-scroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}
.ticker-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  flex-shrink: 0;
}
.ticker-item a {
  color: var(--color-text);
  text-decoration: none;
  transition: color 0.15s;
}
.ticker-item a:hover { color: var(--color-primary); }
.ticker-item em {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--color-text-muted);
  opacity: 0.6;
  margin-left: var(--space-1);
}
.ticker-item::before {
  content: '';
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-primary);
  flex-shrink: 0;
  opacity: 0.5;
}

/* ===== CONFERENCES ===== */
.conferences-section { scroll-margin-top: 7rem; }
.conf-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-4);
}
.conf-card {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface-2);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-md);
  transition: border-color 0.2s, background 0.2s, transform 0.15s;
  text-decoration: none;
  color: inherit;
}
.conf-card:hover {
  border-color: var(--color-border);
  background: var(--color-surface);
  transform: translateY(-2px);
}
a.conf-card:hover { border-color: var(--color-primary); }
.conf-featured {
  border-color: rgba(0, 212, 255, 0.25);
  background: linear-gradient(135deg, var(--color-surface-2), rgba(0, 212, 255, 0.04));
}
.conf-featured:hover {
  border-color: var(--color-primary);
}
.conf-date {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 56px;
  min-height: 56px;
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-sm);
  text-align: center;
  padding: var(--space-2);
}
.conf-month {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  text-transform: uppercase;
  line-height: 1;
}
.conf-day {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.2;
  margin-top: 2px;
}
.conf-body h3 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 2px;
  line-height: 1.3;
}
.conf-loc {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--color-primary);
  letter-spacing: 0.03em;
  margin-bottom: var(--space-2);
}
.conf-desc {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.5;
  margin-bottom: var(--space-2);
}
.conf-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.55rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-sm);
  padding: 1px var(--space-2);
  margin-right: var(--space-1);
}
@media (max-width: 768px) {
  .conf-grid { grid-template-columns: 1fr; }
  .news-ticker { height: 36px; }
  .ticker-label { font-size: 0.55rem; padding: 0 var(--space-3); }
}

/* ===== NETWORK GRAPH ===== */
.network-section {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-divider);
  scroll-margin-top: 3.5rem;
}
.network-header {
  padding: var(--space-8) var(--space-6) var(--space-4);
}
.network-header-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
}
.network-header h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.network-header p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}
.network-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}
.network-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}
.legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}
.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.network-filters {
  display: flex;
  gap: var(--space-1);
  flex-wrap: wrap;
}
.net-filter-btn {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  border: 1px solid var(--color-divider);
  background: transparent;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 600;
}
.net-filter-btn:hover {
  color: var(--color-text);
  border-color: var(--color-border);
}
.net-filter-btn.active {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: var(--color-primary-dim);
}
.network-canvas-wrap {
  position: relative;
  width: 100%;
  height: 600px;
  overflow: hidden;
  cursor: grab;
}
.network-canvas-wrap:active { cursor: grabbing; }
#networkCanvas {
  width: 100%;
  height: 100%;
  display: block;
}
.network-tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text);
  max-width: 280px;
  opacity: 0;
  transition: opacity 0.15s ease;
  z-index: 20;
  box-shadow: var(--shadow-lg);
  line-height: 1.5;
}
.network-tooltip.visible { opacity: 1; }
.network-tooltip .tt-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-sm);
  margin-bottom: var(--space-1);
}
.network-tooltip .tt-type {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-2);
}
.network-tooltip .tt-desc {
  color: var(--color-text-muted);
}

@media (max-width: 768px) {
  .network-canvas-wrap { height: 450px; }
  .network-controls { flex-direction: column; align-items: flex-start; }
}

/* Mobile nav overlay */
.mobile-menu-btn {
  display: none;
  padding: var(--space-2);
  color: var(--color-text-muted);
}
@media (max-width: 768px) {
  .mobile-menu-btn { display: block; }
}