/* ============================================================
   KOSMOS — style.css
   ============================================================ */

/* --- Variables --- */
:root {
  --bg:          #050505;
  --bg2:         #0a0a0f;
  --surface:     rgba(255,255,255,0.03);
  --border:      rgba(255,255,255,0.07);
  --border-glow: rgba(100,180,255,0.25);
  --text:        #e8e8f0;
  --text-muted:  rgba(232,232,240,0.45);
  --accent:      #5b9cf6;
  --accent2:     #9b72f5;
  --glow:        rgba(91,156,246,0.18);
  --glow2:       rgba(155,114,245,0.15);
  --font-display: 'Syne', sans-serif;
  --font-body:    'DM Sans', sans-serif;
  --radius:       12px;
  --radius-lg:    20px;
  --trans:        0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.7;
  overflow-x: hidden;
  cursor: none;
}
a { text-decoration: none; color: inherit; }
img { display: block; width: 100%; height: 100%; object-fit: cover; }
ul { list-style: none; }

/* --- Noise Overlay --- */
.noise-overlay {
  position: fixed; inset: 0; z-index: 9999;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='1'/%3E%3C/svg%3E");
  opacity: 0.028;
  pointer-events: none;
}

/* --- Canvas Background --- */
#bg-canvas {
  position: fixed; inset: 0; z-index: 0;
  pointer-events: none;
}

/* --- Scroll Progress --- */
.scroll-progress {
  position: fixed; top: 0; left: 0; height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  z-index: 10000; width: 0%;
  box-shadow: 0 0 12px var(--accent);
  transition: width 0.1s linear;
}

/* --- Custom Cursor --- */
.cursor {
  position: fixed; width: 8px; height: 8px;
  background: var(--accent); border-radius: 50%;
  pointer-events: none; z-index: 99998;
  transform: translate(-50%, -50%);
  transition: transform 0.1s, background 0.2s;
  mix-blend-mode: screen;
}
.cursor-follower {
  position: fixed; width: 36px; height: 36px;
  border: 1px solid rgba(91,156,246,0.4);
  border-radius: 50%; pointer-events: none; z-index: 99997;
  transform: translate(-50%, -50%);
  transition: transform 0.18s cubic-bezier(0.22,1,0.36,1), width 0.3s, height 0.3s, border-color 0.3s;
}
body:has(a:hover) .cursor-follower,
body:has(button:hover) .cursor-follower {
  width: 56px; height: 56px;
  border-color: rgba(155,114,245,0.5);
}

/* --- Container --- */
.container {
  max-width: 1200px; margin: 0 auto;
  padding: 0 2rem;
}

/* --- Navbar --- */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.4rem 3rem;
  background: rgba(5,5,5,0.4);
  backdrop-filter: blur(20px) saturate(1.2);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
  border-bottom: 1px solid var(--border);
  transition: background var(--trans), padding var(--trans);
}
.navbar.scrolled {
  background: rgba(5,5,5,0.7);
  padding: 1rem 3rem;
}
.nav-logo {
  font-family: var(--font-display);
  font-size: 1.5rem; font-weight: 800;
  letter-spacing: 0.08em;
  background: linear-gradient(135deg, #fff 40%, var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav-logo span { color: var(--accent); -webkit-text-fill-color: var(--accent); }
.nav-links {
  display: flex; gap: 2.5rem;
}
.nav-link {
  font-size: 0.82rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--text-muted); font-weight: 400;
  position: relative; transition: color var(--trans);
}
.nav-link::after {
  content: ''; position: absolute; bottom: -4px; left: 0; right: 0;
  height: 1px; background: var(--accent);
  transform: scaleX(0); transform-origin: right;
  transition: transform var(--trans);
}
.nav-link:hover { color: var(--text); }
.nav-link:hover::after { transform: scaleX(1); transform-origin: left; }
.btn-nav {
  font-size: 0.78rem; font-weight: 500;
  letter-spacing: 0.1em; text-transform: uppercase;
  padding: 0.55rem 1.4rem;
  border: 1px solid var(--border-glow);
  border-radius: 100px;
  background: rgba(91,156,246,0.08);
  color: var(--accent);
  transition: background var(--trans), box-shadow var(--trans);
}
.btn-nav:hover {
  background: rgba(91,156,246,0.18);
  box-shadow: 0 0 20px rgba(91,156,246,0.25);
}

/* --- Hero --- */
.hero {
  position: relative; z-index: 1;
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  text-align: center; padding: 8rem 2rem 4rem;
}
.hero-content {
  max-width: 860px;
  display: flex; flex-direction: column; align-items: center; gap: 1.8rem;
}
.hero-eyebrow {
  font-size: 0.72rem; letter-spacing: 0.3em; text-transform: uppercase;
  color: var(--accent); font-weight: 500;
  border: 1px solid rgba(91,156,246,0.25);
  padding: 0.4rem 1.2rem; border-radius: 100px;
  background: rgba(91,156,246,0.06);
}
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(5rem, 18vw, 13rem);
  font-weight: 800; line-height: 0.9;
  letter-spacing: -0.02em;
  background: linear-gradient(160deg, #ffffff 30%, rgba(91,156,246,0.7) 80%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: none;
  filter: drop-shadow(0 0 60px rgba(91,156,246,0.35));
  animation: heroFloat 6s ease-in-out infinite;
}
@keyframes heroFloat {
  0%, 100% { transform: translateY(0px); }
  50%       { transform: translateY(-12px); }
}
.hero-desc {
  max-width: 600px;
  font-size: 1.02rem; line-height: 1.8;
  color: var(--text-muted); font-weight: 300;
}
.hero-buttons {
  display: flex; gap: 1rem; flex-wrap: wrap; justify-content: center;
  margin-top: 0.5rem;
}
.btn-glass {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.85rem 2rem; border-radius: 100px;
  font-size: 0.88rem; font-weight: 500;
  letter-spacing: 0.05em;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.04);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all var(--trans);
  position: relative; overflow: hidden;
}
.btn-glass::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.06), transparent);
  opacity: 0; transition: opacity var(--trans);
}
.btn-glass:hover::before { opacity: 1; }
.btn-primary {
  border-color: rgba(91,156,246,0.35);
  background: rgba(91,156,246,0.1);
  color: #a8d4ff;
}
.btn-primary:hover {
  background: rgba(91,156,246,0.2);
  box-shadow: 0 0 30px rgba(91,156,246,0.3), inset 0 0 20px rgba(91,156,246,0.1);
  border-color: rgba(91,156,246,0.6);
}
.btn-secondary {
  border-color: var(--border);
  color: var(--text-muted);
}
.btn-secondary:hover {
  border-color: rgba(155,114,245,0.4);
  color: var(--text);
  box-shadow: 0 0 24px rgba(155,114,245,0.2);
}
.btn-icon { font-size: 0.9em; opacity: 0.8; }

.hero-scroll-hint {
  position: absolute; bottom: 2.5rem; left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 0.6rem;
}
.scroll-line {
  width: 1px; height: 48px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
  0%, 100% { opacity: 0.2; }
  50%       { opacity: 0.8; }
}
.hero-scroll-hint span {
  font-size: 0.68rem; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--text-muted);
}

/* --- Section Common --- */
section { position: relative; z-index: 1; }
.section-label {
  font-size: 0.68rem; letter-spacing: 0.3em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 1rem; font-weight: 500;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 700; line-height: 1.1;
  letter-spacing: -0.02em; margin-bottom: 2rem;
}
.section-title em {
  font-style: italic;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --- About --- */
.about {
  padding: 8rem 0;
}
.about-text {
  max-width: 680px;
  font-size: 1.08rem; color: var(--text-muted); margin-bottom: 4rem;
  line-height: 1.85;
}
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem 1.8rem;
  transition: all var(--trans);
  position: relative; overflow: hidden;
}
.card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0; transition: opacity var(--trans);
}
.card:hover {
  border-color: rgba(91,156,246,0.2);
  background: rgba(91,156,246,0.04);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.4), 0 0 30px rgba(91,156,246,0.08);
}
.card:hover::before { opacity: 1; }
.card-icon {
  font-size: 1.8rem; margin-bottom: 1.2rem;
  color: var(--accent);
}
.card h3 {
  font-family: var(--font-display);
  font-size: 1.05rem; font-weight: 700;
  margin-bottom: 0.6rem; letter-spacing: -0.01em;
}
.card p {
  font-size: 0.88rem; color: var(--text-muted); line-height: 1.7;
}

/* --- Timeline --- */
.timeline-section {
  padding: 8rem 0;
  background: linear-gradient(180deg, transparent, rgba(91,156,246,0.02), transparent);
}
.timeline {
  position: relative;
  padding-left: 4rem;
  margin-top: 3rem;
}
.timeline::before {
  content: '';
  position: absolute; left: 12px; top: 0; bottom: 0; width: 1px;
  background: linear-gradient(to bottom, var(--accent), var(--accent2), transparent);
  opacity: 0.25;
}
.timeline-item {
  position: relative; margin-bottom: 4rem;
  display: flex; gap: 2rem; align-items: flex-start;
}
.timeline-item:last-child { margin-bottom: 0; }
.timeline-node {
  position: absolute; left: -4rem;
  display: flex; align-items: center; justify-content: center;
  width: 26px; height: 26px; flex-shrink: 0;
}
.node-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent), 0 0 24px rgba(91,156,246,0.4);
  position: absolute;
}
.node-ring {
  width: 26px; height: 26px; border-radius: 50%;
  border: 1px solid rgba(91,156,246,0.3);
  position: absolute;
  animation: ringPulse 3s ease-in-out infinite;
}
@keyframes ringPulse {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50%       { transform: scale(1.3); opacity: 0.1; }
}
.timeline-content { flex: 1; }
.timeline-year {
  font-family: var(--font-display);
  font-size: 0.75rem; font-weight: 700;
  letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 0.4rem;
}
.timeline-event {
  font-family: var(--font-display);
  font-size: 1.5rem; font-weight: 700;
  margin-bottom: 0.6rem; letter-spacing: -0.01em;
}
.timeline-content p {
  font-size: 0.92rem; color: var(--text-muted); line-height: 1.75;
  max-width: 520px;
}

/* --- Gallery --- */
.gallery-section { padding: 8rem 0; }
.gallery-filter {
  display: flex; gap: 0.6rem; flex-wrap: wrap; margin-bottom: 3rem;
}
.filter-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: 0.8rem; font-weight: 400;
  letter-spacing: 0.08em; text-transform: uppercase;
  padding: 0.45rem 1.2rem; border-radius: 100px;
  cursor: none; transition: all var(--trans);
}
.filter-btn.active,
.filter-btn:hover {
  background: rgba(91,156,246,0.12);
  border-color: rgba(91,156,246,0.35);
  color: var(--accent);
}
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: 220px;
  gap: 1rem;
}
.gallery-item {
  position: relative; overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  cursor: none;
}
.gallery-item.tall { grid-row: span 2; }
.gallery-item.wide { grid-column: span 2; }
.gallery-item img {
  transition: transform 0.7s cubic-bezier(0.22,1,0.36,1), filter 0.5s;
  filter: brightness(0.85) saturate(0.9);
}
.gallery-item:hover img {
  transform: scale(2);
  filter: brightness(0.6) saturate(1.1);
}
.gallery-overlay {
  position: absolute; inset: 0;
  display: flex; flex-direction: column;
  justify-content: flex-end; padding: 1.4rem;
  background: linear-gradient(to top, rgba(5,5,5,0.85) 0%, transparent 60%);
  opacity: 0; transition: opacity var(--trans);
}
.gallery-item:hover .gallery-overlay { opacity: 1; }
.gallery-tag {
  font-size: 0.66rem; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 0.3rem; font-weight: 500;
}
.gallery-overlay h4 {
  font-family: var(--font-display);
  font-size: 1rem; font-weight: 700;
}
.gallery-item.hidden { display: none; }

/* --- Footer --- */
.footer {
  position: relative; z-index: 1;
  padding: 6rem 0 3rem; text-align: center;
  border-top: 1px solid var(--border);
  overflow: hidden;
}
.footer-glow {
  position: absolute; bottom: -60px; left: 50%; transform: translateX(-50%);
  width: 600px; height: 200px;
  background: radial-gradient(ellipse, rgba(91,156,246,0.08), transparent 70%);
  pointer-events: none;
}
.footer-logo {
  font-family: var(--font-display);
  font-size: 3rem; font-weight: 800;
  letter-spacing: 0.1em;
  background: linear-gradient(135deg, #fff, rgba(91,156,246,0.6));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; margin-bottom: 0.8rem;
}
.footer-tagline {
  font-size: 0.9rem; color: var(--text-muted); margin-bottom: 3rem;
}
.footer-line {
  width: 80px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  margin: 0 auto 2rem;
}
.footer-copy {
  font-size: 0.78rem; color: rgba(232,232,240,0.25); letter-spacing: 0.05em;
}

/* --- Lightbox --- */
.lightbox {
  position: fixed; inset: 0; z-index: 9000;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none;
  transition: opacity 0.4s;
}
.lightbox.active { opacity: 1; pointer-events: all; }
.lightbox-backdrop {
  position: absolute; inset: 0;
  background: rgba(3,3,8,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}
.lightbox-inner {
  position: relative; z-index: 1;
  max-width: 90vw; max-height: 85vh;
  display: flex; flex-direction: column; align-items: center; gap: 1.2rem;
  transform: scale(0.9); transition: transform 0.4s cubic-bezier(0.22,1,0.36,1);
}
.lightbox.active .lightbox-inner { transform: scale(1); }
.lightbox-inner img {
  max-width: 80vw; max-height: 75vh;
  width: auto; height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: 0 40px 100px rgba(0,0,0,0.8), 0 0 60px rgba(91,156,246,0.1);
}
.lightbox-meta { text-align: center; }
.lightbox-meta span {
  font-size: 0.7rem; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--accent); display: block; margin-bottom: 0.3rem;
}
.lightbox-meta h3 {
  font-family: var(--font-display); font-size: 1.2rem;
}
.lightbox-close {
  position: absolute; top: 1.5rem; right: 1.5rem; z-index: 2;
  background: rgba(255,255,255,0.06); border: 1px solid var(--border);
  color: var(--text); width: 42px; height: 42px;
  border-radius: 50%; font-size: 0.9rem;
  display: flex; align-items: center; justify-content: center;
  cursor: none; transition: all var(--trans);
}
.lightbox-close:hover {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.2);
}
.lightbox-nav {
  position: absolute; top: 50%; z-index: 2;
  transform: translateY(-50%);
  background: rgba(255,255,255,0.05); border: 1px solid var(--border);
  color: var(--text); width: 50px; height: 50px;
  border-radius: 50%; font-size: 1.4rem;
  display: flex; align-items: center; justify-content: center;
  cursor: none; transition: all var(--trans);
}
.lightbox-nav:hover {
  background: rgba(91,156,246,0.15);
  border-color: var(--border-glow);
}
.lightbox-nav.prev { left: 1.5rem; }
.lightbox-nav.next { right: 1.5rem; }

/* --- Reveal Animations --- */
.reveal-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.22,1,0.36,1), transform 0.8s cubic-bezier(0.22,1,0.36,1);
}
.reveal-up.visible { opacity: 1; transform: translateY(0); }

.reveal-card {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s cubic-bezier(0.22,1,0.36,1), transform 0.7s cubic-bezier(0.22,1,0.36,1);
}
.reveal-card.visible { opacity: 1; transform: translateY(0); }

.reveal-timeline {
  opacity: 0; transform: translateX(-24px);
  transition: opacity 0.7s cubic-bezier(0.22,1,0.36,1), transform 0.7s cubic-bezier(0.22,1,0.36,1);
}
.reveal-timeline.visible { opacity: 1; transform: translateX(0); }

.reveal-gallery {
  opacity: 0; transform: scale(0.94);
  transition: opacity 0.6s, transform 0.6s cubic-bezier(0.22,1,0.36,1);
}
.reveal-gallery.visible { opacity: 1; transform: scale(1); }

/* --- Responsive --- */
@media (max-width: 900px) {
  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .gallery-item.wide { grid-column: span 2; }
  .navbar { padding: 1rem 1.5rem; }
  .nav-cta { display: none; }
  .timeline { padding-left: 3rem; }
}
@media (max-width: 640px) {
  .hero-buttons { flex-direction: column; align-items: center; }
  .nav-links { gap: 1.2rem; }
  .nav-link { font-size: 0.72rem; }
  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
    grid-auto-rows: 160px;
  }
  .gallery-item.tall { grid-row: span 1; }
  .cards-grid { grid-template-columns: 1fr; }
  .lightbox-nav { display: none; }
  body { cursor: auto; }
  .cursor, .cursor-follower { display: none; }
}