:root {
  --bg: #07070b;
  --bg-2: #0d0d14;
  --text: #f5f5f7;
  --muted: #8e8e98;
  --muted-2: #5c5c66;
  --line: rgba(255, 255, 255, 0.08);
  --card: rgba(20, 20, 28, 0.7);
  --card-border: rgba(255, 255, 255, 0.08);
  --card-border-hover: rgba(255, 255, 255, 0.18);

  --era-og: #ff9f0a;
  --era-retina: #30d158;
  --era-big: #64d2ff;
  --era-edge: #bf5af2;
  --era-five-g: #ff375f;
  --era-ai: #0a84ff;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(1200px 600px at 50% -10%, rgba(10, 132, 255, 0.18), transparent 60%),
    radial-gradient(800px 400px at 100% 30%, rgba(191, 90, 242, 0.10), transparent 60%),
    radial-gradient(900px 500px at 0% 70%, rgba(255, 55, 95, 0.10), transparent 60%);
  pointer-events: none;
  z-index: -2;
}

.bg-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
  z-index: -1;
  pointer-events: none;
  animation: float 18s ease-in-out infinite;
}
.orb-1 { width: 380px; height: 380px; top: 10%; left: -120px; background: #0a84ff; }
.orb-2 { width: 320px; height: 320px; top: 60%; right: -100px; background: #bf5af2; animation-delay: -6s; }
.orb-3 { width: 280px; height: 280px; top: 90%; left: 30%; background: #ff375f; animation-delay: -12s; }

@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(20px, -30px); }
}

.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, #0a84ff, #bf5af2, #ff375f);
  z-index: 100;
  transition: width 0.05s linear;
}

.hero {
  position: relative;
  text-align: center;
  padding: 120px 24px 60px;
  max-width: 880px;
  margin: 0 auto;
}

.hero-tag {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 28px;
  backdrop-filter: blur(10px);
}

.hero h1 {
  font-size: clamp(3rem, 9vw, 6rem);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.04em;
  margin: 0 0 24px;
}

.gradient-text {
  background: linear-gradient(90deg, #0a84ff, #bf5af2, #ff375f);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  background-size: 200% 200%;
  animation: shimmer 6s ease infinite;
}

@keyframes shimmer {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.subtitle {
  color: var(--muted);
  font-size: clamp(1rem, 1.6vw, 1.2rem);
  line-height: 1.55;
  max-width: 560px;
  margin: 0 auto 40px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.stat .num {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(180deg, #fff, #9a9aa6);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat .lbl {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted-2);
}

.scroll-hint {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--muted-2);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  animation: bob 2.4s ease-in-out infinite;
}
.scroll-hint .arrow {
  width: 1px;
  height: 28px;
  background: linear-gradient(180deg, var(--muted-2), transparent);
}

@keyframes bob {
  0%, 100% { transform: translateY(0); opacity: 0.6; }
  50% { transform: translateY(6px); opacity: 1; }
}

.timeline {
  position: relative;
  max-width: 1100px;
  margin: 60px auto 80px;
  padding: 0 24px;
}

.timeline-line {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, transparent, var(--line) 4%, var(--line) 96%, transparent);
}

.event {
  position: relative;
  width: 50%;
  padding: 0 48px 56px 0;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.event.visible { opacity: 1; transform: translateY(0); }

.event:nth-child(even) {
  margin-left: 50%;
  padding: 0 0 56px 48px;
}

.dot {
  position: absolute;
  top: 22px;
  right: -7px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent, #0a84ff);
  box-shadow: 0 0 0 4px rgba(10, 132, 255, 0.15), 0 0 18px var(--accent, #0a84ff);
  z-index: 1;
}
.event:nth-child(even) .dot { right: auto; left: -7px; }

.dot.pulse::after {
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 2px solid var(--accent, #0a84ff);
  animation: pulse 1.8s ease-out infinite;
}
@keyframes pulse {
  0% { transform: scale(0.8); opacity: 1; }
  100% { transform: scale(2.2); opacity: 0; }
}

.event[data-era="og"]      { --accent: var(--era-og); }
.event[data-era="retina"]  { --accent: var(--era-retina); }
.event[data-era="big"]     { --accent: var(--era-big); }
.event[data-era="edge"]    { --accent: var(--era-edge); }
.event[data-era="five-g"]  { --accent: var(--era-five-g); }
.event[data-era="ai"]      { --accent: var(--era-ai); }

.card {
  position: relative;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 22px 24px 18px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}
.card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 18px;
  padding: 1px;
  background: linear-gradient(135deg, var(--accent, #0a84ff), transparent 60%);
  -webkit-mask: linear-gradient(#000, #000) content-box, linear-gradient(#000, #000);
  mask: linear-gradient(#000, #000) content-box, linear-gradient(#000, #000);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0.55;
  pointer-events: none;
}
.card:hover {
  transform: translateY(-3px);
  border-color: var(--card-border-hover);
  box-shadow: 0 24px 60px -28px var(--accent, #0a84ff);
}

.era-pill {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent, #0a84ff);
  background: color-mix(in srgb, var(--accent, #0a84ff) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent, #0a84ff) 35%, transparent);
  margin-bottom: 12px;
}

.card time {
  display: block;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  margin-bottom: 6px;
}

.card h2 {
  margin: 0 0 8px;
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
}

.card h2 .gen {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.badge {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 6px;
  background: var(--accent, #0a84ff);
  color: #fff;
}

.card p {
  margin: 0 0 14px;
  color: var(--muted);
  line-height: 1.55;
  font-size: 0.95rem;
}

.specs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  list-style: none;
  padding: 12px 0 0;
  margin: 0;
  border-top: 1px solid var(--line);
}

.specs li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 0.78rem;
  color: var(--text);
  font-weight: 500;
}

.specs li span {
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted-2);
  font-weight: 500;
}

footer {
  text-align: center;
  padding: 40px 24px 60px;
  color: var(--muted);
  font-size: 0.92rem;
}
footer .meta {
  margin-top: 6px;
  font-size: 0.78rem;
  color: var(--muted-2);
}
footer a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px dotted var(--muted-2);
}
footer a:hover { color: #fff; }

@media (max-width: 760px) {
  .timeline { padding-left: 56px; }
  .timeline-line { left: 22px; transform: none; }

  .event,
  .event:nth-child(even) {
    width: 100%;
    margin-left: 0;
    padding: 0 0 40px 0;
  }

  .dot,
  .event:nth-child(even) .dot {
    left: -41px;
    right: auto;
    top: 22px;
  }

  .specs { grid-template-columns: 1fr 1fr; }
  .hero { padding-top: 80px; }
}