/* ============================================
   EARTH EXHIBIT — Style System
   Brand: #35F5C5 teal, black backgrounds
   Fonts: Inter (UI), Playfair Display (editorial)
   ============================================ */

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

:root {
  --primary: #35F5C5;
  --primary-dim: rgba(53, 245, 197, 0.15);
  --primary-glow: rgba(53, 245, 197, 0.3);
  --bg: #000000;
  --bg-raised: #0a0e1a;
  --bg-card: #0d1117;
  --bg-card-hover: #141b24;
  --text: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.6);
  --text-dim: rgba(255, 255, 255, 0.35);
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(53, 245, 197, 0.25);
  --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-editorial: 'Playfair Display', Georgia, serif;
  --max-width: 1200px;
  --nav-height: 72px;
}

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

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

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

img {
  display: block;
  max-width: 100%;
  height: auto;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- SECTION TYPOGRAPHY --- */
.section-eyebrow {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 16px;
}

.section-title {
  font-family: var(--font-editorial);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 400;
  line-height: 1.15;
  margin-bottom: 48px;
}

/* --- NAV --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  transition: background 0.4s, backdrop-filter 0.4s, box-shadow 0.4s;
}

.nav.scrolled {
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--border);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.25em;
  color: var(--primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-links a {
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  transition: color 0.3s;
}

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

.nav-cta {
  padding: 8px 20px;
  border: 1px solid var(--primary);
  border-radius: 100px;
  color: var(--primary) !important;
  font-weight: 600 !important;
  transition: background 0.3s, color 0.3s !important;
}

.nav-cta:hover {
  background: var(--primary);
  color: var(--bg) !important;
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  transition: transform 0.3s, opacity 0.3s;
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile nav */
.nav-mobile {
  display: none;
  flex-direction: column;
  padding: 16px 24px 24px;
  background: rgba(0, 0, 0, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--border);
}

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

.nav-mobile a {
  padding: 12px 0;
  font-size: 1rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  transition: color 0.3s;
}

.nav-mobile a:last-child {
  border-bottom: none;
}

.nav-mobile a:hover {
  color: var(--primary);
}

/* --- HERO --- */
.hero {
  position: relative;
  height: 100vh;
  min-height: 700px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
}

.hero-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  transform: scale(1.12);
  will-change: transform;
  opacity: 0;
  transition: opacity 1.8s ease;
}

.hero-img.active {
  opacity: 1;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to bottom,
      rgba(0, 0, 0, 0.3) 0%,
      rgba(0, 0, 0, 0.1) 30%,
      rgba(0, 0, 0, 0.2) 60%,
      rgba(0, 0, 0, 0.85) 100%
    );
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 0 24px;
  max-width: 800px;
}

.hero-eyebrow {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 24px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 1s 0.3s forwards;
}

.hero-title {
  font-family: var(--font-ui);
  font-size: clamp(3.5rem, 12vw, 8rem);
  font-weight: 800;
  letter-spacing: 0.08em;
  line-height: 0.95;
  margin-bottom: 28px;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeUp 1s 0.5s forwards;
  text-shadow: 0 0 80px rgba(53, 245, 197, 0.15);
}

.hero-subtitle {
  font-family: var(--font-editorial);
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  font-weight: 400;
  font-style: italic;
  color: var(--text-secondary);
  max-width: 580px;
  margin: 0 auto 40px;
  line-height: 1.7;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 1s 0.7s forwards;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  margin-bottom: 48px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 1s 0.9s forwards;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.stat-number {
  font-family: var(--font-ui);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--primary);
}

.stat-label {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.stat-divider {
  width: 1px;
  height: 32px;
  background: var(--border);
}

.hero-cta {
  display: inline-block;
  padding: 14px 40px;
  border: 1px solid var(--primary);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--primary);
  transition: background 0.4s, color 0.4s, box-shadow 0.4s;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 1s 1.1s forwards;
}

.hero-cta:hover {
  background: var(--primary);
  color: var(--bg);
  box-shadow: 0 0 40px rgba(53, 245, 197, 0.25);
}

/* Scroll hint */
.hero-scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  opacity: 0;
  animation: fadeIn 1s 2s forwards;
}

.scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--primary), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  to { opacity: 1; }
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(1); }
  50% { opacity: 0.8; transform: scaleY(1.3); }
}

/* --- CATEGORIES --- */
.categories {
  padding: 120px 0 80px;
  background: var(--bg);
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  max-width: 600px;
  margin: 0 auto;
}

.category-card {
  position: relative;
  padding: 16px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  text-align: center;
  transition: border-color 0.4s, background 0.4s, transform 0.3s;
  cursor: pointer;
}

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

.category-icon {
  font-size: 1.35rem;
  margin-bottom: 8px;
  color: var(--primary);
  opacity: 0.8;
  transition: opacity 0.3s;
}

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

.category-card h3 {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 3px;
  color: var(--text);
}

.category-card p {
  font-size: 0.7rem;
  color: var(--text-dim);
  line-height: 1.4;
}

.category-card:hover h3 {
  color: var(--primary);
}

/* --- FEATURED PHENOMENA --- */
.featured {
  padding: 80px 0 40px;
  background: var(--bg);
}

.phenomenon-feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  min-height: 500px;
  margin-bottom: 2px;
}

.phenomenon-feature.reverse {
  direction: rtl;
}

.phenomenon-feature.reverse > * {
  direction: ltr;
}

.feature-image {
  position: relative;
  overflow: hidden;
}

.feature-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 6s ease-out;
}

.phenomenon-feature:hover .feature-image img {
  transform: scale(1.05);
}

.feature-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 60px 56px;
  background: var(--bg-raised);
  border: 1px solid var(--border);
}

.feature-category {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 16px;
}

.feature-title {
  font-family: var(--font-editorial);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 400;
  line-height: 1.2;
  margin-bottom: 20px;
}

.feature-description {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 28px;
}

.feature-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.meta-tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--primary-dim);
  border-radius: 100px;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--primary);
  letter-spacing: 0.03em;
}

/* --- APP SECTION --- */
.app-section {
  padding: 120px 0;
  background: var(--bg-raised);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.app-section .section-title {
  margin-bottom: 20px;
}

.app-description {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.8;
  margin-bottom: 56px;
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  margin-bottom: 56px;
}

.feature-item {
  padding: 28px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color 0.3s;
}

.feature-item:hover {
  border-color: var(--border-hover);
}

.feature-icon {
  font-size: 1.5rem;
  margin-bottom: 16px;
  color: var(--primary);
}

.feature-item h4 {
  font-family: var(--font-ui);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
}

.feature-item p {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.6;
}

.app-cta-group {
  display: flex;
  gap: 16px;
}

.app-store-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 28px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color 0.3s, background 0.3s;
}

.app-store-btn:hover {
  border-color: var(--primary);
  background: var(--bg-card);
}

.store-icon {
  font-size: 1.5rem;
}

.store-text {
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.3;
}

.store-text small {
  font-size: 0.65rem;
  font-weight: 400;
  color: var(--text-dim);
  letter-spacing: 0.02em;
}

/* --- WAITLIST --- */
.waitlist {
  max-width: 480px;
}

.waitlist-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.waitlist-form {
  display: flex;
  gap: 0;
  border-radius: 100px;
  overflow: hidden;
  border: 1px solid var(--border);
  transition: border-color 0.3s;
}

.waitlist-form:focus-within {
  border-color: var(--primary);
}

.waitlist-form input[type="email"] {
  flex: 1;
  padding: 14px 20px;
  background: var(--bg-card);
  border: none;
  outline: none;
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 0.85rem;
}

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

.waitlist-form button {
  padding: 14px 28px;
  background: var(--primary);
  border: none;
  color: var(--bg);
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: opacity 0.3s;
}

.waitlist-form button:hover {
  opacity: 0.85;
}

.waitlist-success {
  font-size: 0.85rem;
  color: var(--primary);
  margin-top: 12px;
}

/* --- ABOUT / MISSION --- */
.about {
  padding: 120px 0;
  background: var(--bg);
}

.about-content {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.mission-quote {
  font-family: var(--font-editorial);
  font-size: clamp(1.15rem, 2.5vw, 1.5rem);
  font-style: italic;
  line-height: 1.8;
  color: var(--text);
  margin-bottom: 32px;
  border: none;
  padding: 0;
  position: relative;
}

.mission-quote::before {
  content: '';
  display: block;
  width: 40px;
  height: 2px;
  background: var(--primary);
  margin: 0 auto 32px;
}

.mission-text {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* --- FOOTER --- */
.footer {
  padding: 48px 0 32px;
  background: var(--bg);
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
}

.footer-logo {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.25em;
  color: var(--primary);
}

.footer-tagline {
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-top: 4px;
}

.footer-links {
  display: flex;
  gap: 28px;
}

.footer-links a {
  font-size: 0.82rem;
  color: var(--text-secondary);
  transition: color 0.3s;
  display: flex;
  align-items: center;
}

.footer-links a .mdi {
  font-size: 1.2rem;
}

.footer-links a:hover {
  color: var(--primary);
}

.footer-bottom {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.footer-bottom p {
  font-size: 0.72rem;
  color: var(--text-dim);
}

/* --- 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) {
  .feature-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 60px;
  }

  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

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

  .phenomenon-feature {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .phenomenon-feature.reverse {
    direction: ltr;
  }

  .feature-image {
    height: 300px;
  }

  .feature-content {
    padding: 36px 24px;
  }

  .feature-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .app-cta-group {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 24px;
  }

  .hero-stats {
    gap: 20px;
  }

  .stat-number {
    font-size: 1.35rem;
  }

  .categories {
    padding: 80px 0 60px;
  }
}

@media (max-width: 480px) {
  .category-grid {
    grid-template-columns: 1fr;
  }

  .hero-title {
    letter-spacing: 0.04em;
  }

  .hero-stats {
    gap: 16px;
  }

  .stat-divider {
    height: 24px;
  }

  .footer-links {
    flex-direction: column;
    gap: 12px;
  }
}