/* ============================================
   DEOXY.AI — Research Intelligence Directory
   ============================================ */

/* --- Reset & Base --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #050510;
  --bg-elevated: #0a0a1a;
  --bg-card: #0d0d20;
  --bg-card-hover: #12122a;
  --surface: #161630;
  --border: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.12);
  --text: #e8e8f0;
  --text-secondary: #8888a8;
  --text-muted: #55556a;
  --accent: #6c5ce7;
  --accent-light: #a29bfe;
  --accent-glow: rgba(108, 92, 231, 0.3);
  --cyan: #00cec9;
  --cyan-glow: rgba(0, 206, 201, 0.2);
  --magenta: #e84393;
  --gradient-primary: linear-gradient(135deg, #6c5ce7, #00cec9);
  --gradient-hero: linear-gradient(135deg, #6c5ce7 0%, #a29bfe 30%, #00cec9 70%, #55efc4 100%);
  --radius: 12px;
  --radius-lg: 20px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 60px rgba(108, 92, 231, 0.15);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'JetBrains Mono', monospace;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
  backdrop-filter: blur(0px);
}

.nav.scrolled {
  background: rgba(5, 5, 16, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.logo-mark {
  font-size: 24px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-accent {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition);
}

.nav-link:hover {
  color: var(--text);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-btn {
  font-size: 13px;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: 100px;
  background: var(--gradient-primary);
  color: #fff;
  transition: transform var(--transition), box-shadow var(--transition);
}

.nav-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--accent-glow);
}

.nav-mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-mobile-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-canvas-wrap {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-canvas-wrap spline-viewer,
.hero-canvas-wrap canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100% !important;
  height: 100% !important;
  display: block;
  border: none;
  outline: none;
}

.hero-canvas-overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 30% 50%, rgba(108, 92, 231, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 50%, rgba(0, 206, 201, 0.06) 0%, transparent 60%),
    linear-gradient(180deg, rgba(5, 5, 16, 0.3) 0%, rgba(5, 5, 16, 0.1) 40%, rgba(5, 5, 16, 0.6) 80%, rgba(5, 5, 16, 1) 100%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 10;
  text-align: center;
  max-width: 780px;
  padding: 120px 24px 80px;
}

.hero-badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--cyan);
  background: var(--cyan-glow);
  border: 1px solid rgba(0, 206, 201, 0.2);
  padding: 8px 20px;
  border-radius: 100px;
  margin-bottom: 28px;
  animation: fadeInUp 0.8s ease both;
}

.hero-title {
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -2px;
  margin-bottom: 24px;
  animation: fadeInUp 0.8s ease 0.1s both;
}

.hero-gradient-text {
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.7;
  animation: fadeInUp 0.8s ease 0.2s both;
}

/* Search Box */
.hero-search {
  animation: fadeInUp 0.8s ease 0.3s both;
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 6px 6px 6px 20px;
  max-width: 580px;
  margin: 0 auto;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-glow);
}

.search-icon {
  color: var(--text-muted);
  flex-shrink: 0;
  margin-right: 12px;
}

.search-box input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  padding: 12px 0;
}

.search-box input::placeholder {
  color: var(--text-muted);
}

.search-btn {
  padding: 12px 28px;
  border-radius: 100px;
  border: none;
  background: var(--gradient-primary);
  color: #fff;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}

.search-btn:hover {
  transform: scale(1.02);
  box-shadow: 0 4px 20px var(--accent-glow);
}

.search-tags {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.tag {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--surface);
  padding: 6px 14px;
  border-radius: 100px;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: var(--transition);
}

.tag:hover {
  color: var(--text);
  border-color: var(--accent);
  background: rgba(108, 92, 231, 0.1);
}

/* Hero Stats */
.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  margin-top: 48px;
  animation: fadeInUp 0.8s ease 0.4s both;
}

.stat {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -1px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 500;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

/* Scroll Indicator */
.hero-scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  animation: fadeInUp 0.8s ease 0.6s both;
}

.hero-scroll-indicator span {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 2px;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

/* --- Section Common --- */
.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent-light);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto;
}

/* --- Categories Grid --- */
.categories {
  padding: 120px 0;
  position: relative;
}

.categories::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
  opacity: 0.3;
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.category-card {
  position: relative;
  padding: 28px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
  cursor: pointer;
  overflow: hidden;
}

.category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition);
}

.category-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.category-card:hover::before {
  opacity: 1;
}

.category-featured {
  grid-column: span 2;
  background: linear-gradient(135deg, rgba(108, 92, 231, 0.08), rgba(0, 206, 201, 0.05));
  border-color: rgba(108, 92, 231, 0.15);
}

.category-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(108, 92, 231, 0.1);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  color: var(--accent-light);
}

.category-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.3px;
}

.category-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 16px;
}

.category-count {
  font-size: 12px;
  font-family: var(--mono);
  color: var(--cyan);
  font-weight: 500;
}

/* --- Directory Listings --- */
.directory {
  padding: 80px 0 120px;
}

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

.listing-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.listing-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.listing-header {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 16px;
}

.listing-logo {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}

.listing-meta {
  flex: 1;
  min-width: 0;
}

.listing-meta h3 {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.listing-org {
  font-size: 12px;
  color: var(--text-muted);
}

.listing-badge {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 4px 10px;
  border-radius: 100px;
  background: rgba(108, 92, 231, 0.15);
  color: var(--accent-light);
  white-space: nowrap;
}

.badge-new {
  background: rgba(0, 206, 201, 0.15);
  color: var(--cyan);
}

.listing-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
  margin-bottom: 16px;
}

.listing-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.listing-tags span {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--surface);
  padding: 4px 10px;
  border-radius: 100px;
}

.listing-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.listing-rating {
  display: flex;
  align-items: center;
  gap: 8px;
}

.stars {
  color: #f0c040;
  font-size: 13px;
  letter-spacing: 1px;
}

.rating-count {
  font-size: 12px;
  color: var(--text-muted);
}

.listing-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-light);
  transition: color var(--transition);
}

.listing-link:hover {
  color: var(--cyan);
}

.directory-cta {
  text-align: center;
  margin-top: 48px;
}

.btn-outline {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 100px;
  border: 1px solid var(--border-hover);
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
}

.btn-outline:hover {
  border-color: var(--accent);
  background: rgba(108, 92, 231, 0.08);
  box-shadow: 0 0 30px var(--accent-glow);
}

/* --- Research Section --- */
.research {
  padding: 80px 0 120px;
  position: relative;
}

.research::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--cyan-glow) 0%, transparent 70%);
  pointer-events: none;
  opacity: 0.2;
}

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

.research-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.research-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--accent));
  opacity: 0;
  transition: opacity var(--transition);
}

.research-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.research-card:hover::before {
  opacity: 1;
}

.research-journal {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  font-family: var(--mono);
  color: var(--cyan);
  background: var(--cyan-glow);
  border: 1px solid rgba(0, 206, 201, 0.2);
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 14px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.research-card h3 {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.3px;
  margin-bottom: 10px;
  line-height: 1.3;
}

.research-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.research-card .listing-tags {
  margin-bottom: 0;
}

/* --- Newsletter / Subscribe Section --- */
.newsletter {
  padding: 80px 0;
}

.newsletter-card {
  display: flex;
  align-items: center;
  gap: 60px;
  background: linear-gradient(135deg, rgba(108, 92, 231, 0.08), rgba(0, 206, 201, 0.05));
  border: 1px solid rgba(108, 92, 231, 0.15);
  border-radius: var(--radius-lg);
  padding: 56px 64px;
}

.newsletter-content {
  flex: 1;
}

.newsletter-content h2 {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1.2;
  margin-bottom: 12px;
}

.newsletter-content > p {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.newsletter-visual {
  flex-shrink: 0;
}

.helix-mini {
  animation: helixSpin 10s linear infinite;
}

.subscribe-form .subscribe-input-wrap {
  display: flex;
  align-items: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 4px 4px 4px 20px;
  max-width: 440px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.subscribe-form .subscribe-input-wrap:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-glow);
}

.subscribe-form input[type="email"] {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  padding: 10px 0;
  min-width: 0;
}

.subscribe-form input[type="email"]::placeholder {
  color: var(--text-muted);
}

.subscribe-form button {
  padding: 10px 24px;
  border-radius: 100px;
  border: none;
  background: var(--gradient-primary);
  color: #fff;
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}

.subscribe-form button:hover {
  transform: scale(1.02);
  box-shadow: 0 4px 20px var(--accent-glow);
}

.subscribe-form button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.subscribe-msg {
  font-size: 13px;
  margin-top: 8px;
  min-height: 20px;
}

.subscribe-msg.success {
  color: var(--cyan);
}

.subscribe-msg.error {
  color: var(--magenta);
}

/* Footer subscribe compact */
.subscribe-form-footer {
  margin-top: 16px;
}

.subscribe-form-footer .subscribe-input-wrap {
  max-width: 280px;
  padding: 3px 3px 3px 14px;
}

.subscribe-form-footer input[type="email"] {
  font-size: 13px;
  padding: 8px 0;
}

.subscribe-form-footer button {
  padding: 8px 16px;
  font-size: 12px;
}

@media (max-width: 768px) {
  .newsletter-card {
    flex-direction: column;
    padding: 40px 24px;
    gap: 32px;
    text-align: center;
  }
  .newsletter-visual {
    order: -1;
  }
  .subscribe-form .subscribe-input-wrap {
    max-width: 100%;
  }
}

/* --- About Section --- */
.about {
  padding: 120px 0;
  position: relative;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-content .section-title {
  text-align: left;
}

.about-content p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.about-features {
  margin-top: 36px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.feature {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.feature-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(108, 92, 231, 0.1);
  border-radius: var(--radius-sm);
  color: var(--accent-light);
  flex-shrink: 0;
}

.feature h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 4px;
}

.feature p {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 0;
}

/* About Visual - DNA Helix Animation */
.about-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.helix-graphic {
  position: relative;
  width: 300px;
  height: 300px;
}

.helix-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid;
  animation: helixSpin 8s linear infinite;
}

.ring-1 {
  inset: 0;
  border-color: rgba(108, 92, 231, 0.3);
  animation-duration: 12s;
}

.ring-2 {
  inset: 40px;
  border-color: rgba(0, 206, 201, 0.25);
  animation-duration: 8s;
  animation-direction: reverse;
}

.ring-3 {
  inset: 80px;
  border-color: rgba(162, 155, 254, 0.2);
  animation-duration: 6s;
}

.helix-core {
  position: absolute;
  inset: 110px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow), transparent);
  animation: corePulse 3s ease-in-out infinite;
}

/* --- Submit Section --- */
.submit-section {
  padding: 40px 0 120px;
}

.submit-card {
  background: linear-gradient(135deg, rgba(108, 92, 231, 0.1), rgba(0, 206, 201, 0.06));
  border: 1px solid rgba(108, 92, 231, 0.2);
  border-radius: var(--radius-lg);
  padding: 64px;
  text-align: center;
}

.submit-card h2 {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 16px;
}

.submit-card p {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 480px;
  margin: 0 auto 32px;
}

.submit-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
}

.btn-primary {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 100px;
  background: var(--gradient-primary);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
}

.btn-ghost {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 100px;
  border: 1px solid var(--border-hover);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
}

.btn-ghost:hover {
  border-color: var(--text-muted);
  color: var(--text);
}

/* --- Footer --- */
.footer {
  padding: 64px 0 40px;
  border-top: 1px solid var(--border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 12px;
  max-width: 260px;
}

.footer-col h4 {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text);
  margin-bottom: 16px;
}

.footer-col a {
  display: block;
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 10px;
  transition: color var(--transition);
}

.footer-col a:hover {
  color: var(--text);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-muted);
}

.footer-tagline {
  font-style: italic;
  color: var(--text-muted);
}

/* --- Animations --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(1); }
  50% { opacity: 1; transform: scaleY(1.2); }
}

@keyframes helixSpin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes corePulse {
  0%, 100% { opacity: 0.4; transform: scale(1); }
  50% { opacity: 0.8; transform: scale(1.15); }
}

/* --- Scroll Reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .categories-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .category-featured {
    grid-column: span 2;
  }
  .directory-grid,
  .research-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .about-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .about-visual {
    order: -1;
  }
  .helix-graphic {
    width: 200px;
    height: 200px;
  }
  .ring-2 { inset: 30px; }
  .ring-3 { inset: 60px; }
  .helix-core { inset: 80px; }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .nav-mobile-toggle {
    display: flex;
  }
  .hero-content {
    padding: 100px 20px 60px;
  }
  .hero-title {
    letter-spacing: -1px;
  }
  .hero-stats {
    gap: 24px;
  }
  .stat-number {
    font-size: 24px;
  }
  .categories-grid {
    grid-template-columns: 1fr;
  }
  .category-featured {
    grid-column: span 1;
  }
  .directory-grid,
  .research-grid {
    grid-template-columns: 1fr;
  }
  .submit-card {
    padding: 40px 24px;
  }
  .submit-actions {
    flex-direction: column;
    align-items: center;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .footer-brand {
    grid-column: span 2;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .search-box {
    flex-direction: column;
    border-radius: var(--radius);
    padding: 8px;
    gap: 8px;
  }
  .search-box input {
    width: 100%;
    padding: 12px;
  }
  .search-icon {
    display: none;
  }
  .search-btn {
    width: 100%;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-brand {
    grid-column: span 1;
  }
}