:root {
  --bg: #0b0e14;
  --panel: #121723;
  --text: #e6e6e6;
  --muted: #a9b0c3;
  --accent: #6cc3ff;
  --accent-2: #9ef5c1;
  --border: #232a3a;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background: linear-gradient(180deg, var(--bg), #0f1423 40%, #0b0e14 100%);
  color: var(--text);
  overflow-x: hidden;
  position: relative;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at 20% 20%, rgba(158,245,193,0.15), transparent 45%),
              radial-gradient(circle at 80% 30%, rgba(108,195,255,0.18), transparent 40%),
              radial-gradient(circle at 50% 80%, rgba(108,195,255,0.1), transparent 55%);
  z-index: -2;
  pointer-events: none;
  opacity: 0.7;
}

canvas.particle-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
  filter: blur(0.3px);
  opacity: 0.8;
}

body.has-transition {
  opacity: 0;
  transition: opacity 0.6s ease;
}

body.has-transition.is-ready {
  opacity: 1;
}

body.has-transition.is-exiting {
  opacity: 0;
}

.container { max-width: 960px; margin: 0 auto; padding: 24px; }

header.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(11, 14, 20, 0.72);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}
.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  font-weight: 700;
  letter-spacing: 0.2px;
  font-size: 18px;
}
.brand a {
  color: var(--text);
  text-decoration: none;
}
.menu {
  display: flex;
  gap: 16px;
  align-items: center;
}
.menu a {
  color: var(--muted);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: 6px;
  transition: color 0.2s ease, background-color 0.2s ease;
}
.menu a:hover {
  color: var(--text);
  background-color: rgba(108, 195, 255, 0.12);
}
.lang {
  margin-left: 8px;
}
.lang a {
  color: var(--accent) !important;
  padding: 6px 12px;
  border: 1px solid var(--accent);
  border-radius: 6px;
  font-weight: 500;
  transition: all 0.2s ease;
}
.lang a:hover {
  background: var(--accent);
  color: var(--bg) !important;
}

main { padding-top: 24px; }

.hero { padding: 48px 0; }
.hero h1 { font-size: 32px; margin: 0 0 8px; }
.hero p { margin: 8px 0; color: var(--muted); }
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 16px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: 8px;
  border: 1px solid var(--border);
  color: var(--text);
  text-decoration: none;
  background: #0f1524;
  background-color: #0f1524;
  box-shadow: none;
  text-transform: none;
  letter-spacing: 0.3px;
  min-height: 44px;
}
.btn:hover {
  background: #172038;
  background-color: #172038;
  border-color: rgba(108, 195, 255, 0.35);
}
.btn.primary {
  border-color: transparent;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  background-color: transparent;
  color: #0b0e14;
  font-weight: 600;
  box-shadow: 0 12px 24px rgba(108, 195, 255, 0.25);
}
.btn.waves-effect {
  overflow: hidden;
}
.waves-effect .waves-ripple {
  background-color: rgba(108, 195, 255, 0.35);
}

.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 16px; }
.card h3 { margin: 0 0 6px; font-size: 18px; }
.card p { margin: 6px 0; color: var(--muted); }
.card ul {
  margin: 6px 0;
  padding-left: 18px;
  color: var(--muted);
}
.card li + li {
  margin-top: 4px;
}

.card.reveal,
.section.reveal,
.timeline-item.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.card.reveal.is-visible,
.section.reveal.is-visible,
.timeline-item.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.stats {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  margin-top: 24px;
}

.stat-card {
  background: rgba(18, 23, 35, 0.6);
  border: 1px solid rgba(108, 195, 255, 0.2);
  border-radius: 12px;
  padding: 20px;
  text-align: left;
  position: relative;
  overflow: hidden;
}

.stat-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 0%, rgba(158,245,193,0.15), transparent 65%);
  opacity: 0;
  transition: opacity 0.4s ease;
}

.stat-card:hover::after {
  opacity: 1;
}

.stat-value {
  font-size: 22px;
  font-weight: 600;
  color: var(--accent);
  line-height: 1.4;
}

.stat-label {
  margin-top: 6px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}

.stat-row .col {
  margin-bottom: 16px;
}

.stat-card.card-panel {
  background: rgba(18, 23, 35, 0.85);
  box-shadow: 0 16px 32px rgba(12, 18, 30, 0.45);
}

.chart-card {
  margin-top: 24px;
  min-height: 320px;
  background: rgba(18, 23, 35, 0.85);
  border: 1px solid rgba(108, 195, 255, 0.2);
  border-radius: 16px;
  padding: 24px;
  position: relative;
  overflow: hidden;
}

.chart-card canvas {
  width: 100% !important;
  height: 100% !important;
}

.toolchain-card {
  margin-top: 16px;
  background: rgba(18, 23, 35, 0.85);
  border: 1px solid rgba(108, 195, 255, 0.2);
  border-radius: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  padding-bottom: 20px;
}

.toolchain-card p {
  flex-basis: 100%;
  margin-bottom: 6px;
  color: var(--muted);
}

.toolchain-card .chip {
  background: rgba(108, 195, 255, 0.12);
  color: var(--text);
  border: 1px solid rgba(108, 195, 255, 0.35);
  font-weight: 500;
}

.site-header.is-scrolled {
  box-shadow: 0 12px 24px rgba(9, 12, 20, 0.55);
  background: rgba(11, 14, 20, 0.9);
}

.timeline {
  position: relative;
  margin: 32px 0;
  padding-left: 24px;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 12px;
  width: 2px;
  background: linear-gradient(180deg, rgba(108,195,255,0.6), rgba(158,245,193,0.1));
}

.timeline-item {
  position: relative;
  margin-bottom: 24px;
  padding-left: 32px;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 4px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  background: #0f1524;
  box-shadow: 0 0 12px rgba(108,195,255,0.4);
}

.timeline-year {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 4px;
  letter-spacing: 0.4px;
}

.timeline-item h3 {
  margin: 0 0 6px;
  font-size: 18px;
}

.timeline-item p {
  margin: 6px 0;
  color: var(--muted);
  font-size: 14px;
}

.section { margin: 32px 0; }
.section h2 { margin: 0 0 12px; font-size: 22px; }

footer.site-footer { border-top: 1px solid var(--border); margin-top: 40px; }
footer .container { padding: 16px 24px; color: var(--muted); font-size: 14px; }

.meta { color: var(--muted); font-size: 14px; }

@media (max-width: 520px) {
  .hero h1 { font-size: 26px; }
}