:root {
  --bg: #07070b;
  --bg-2: #0d0d14;
  --fg: #e7e7ee;
  --muted: #9aa0b4;
  --line: #1c1d28;
  --accent: #7c5cff;
  --accent-2: #22d3ee;
  --accent-3: #f472b6;
  --card: rgba(20, 20, 30, 0.6);
  --radius: 14px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

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

code, pre { font-family: 'JetBrains Mono', monospace; }

/* Backgrounds */
.bg-grid {
  position: fixed; inset: 0; z-index: -2;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at center, black 40%, transparent 80%);
}
.bg-glow {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(600px circle at 20% 10%, rgba(124, 92, 255, 0.25), transparent 60%),
    radial-gradient(500px circle at 85% 20%, rgba(34, 211, 238, 0.18), transparent 60%),
    radial-gradient(700px circle at 50% 95%, rgba(244, 114, 182, 0.15), transparent 60%);
}

/* Nav */
.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 22px 6vw;
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(10px);
  background: rgba(7, 7, 11, 0.6);
  border-bottom: 1px solid var(--line);
}
.logo {
  display: flex; align-items: center;
}
.logo img {
  height: 38px; width: auto; display: block;
  filter: drop-shadow(0 4px 14px rgba(124, 92, 255, 0.35));
}
.nav nav { display: flex; gap: 28px; font-size: 14px; color: var(--muted); }
.nav nav a:hover { color: var(--fg); }

.nav-right { display: flex; align-items: center; gap: 12px; }
.lang-switch {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 36px; height: 32px; padding: 0 10px;
  border-radius: 8px; border: 1px solid var(--line);
  font-size: 12px; font-weight: 700; letter-spacing: 0.06em;
  color: var(--muted); background: rgba(255,255,255,0.02);
  font-family: 'JetBrains Mono', monospace;
  transition: color .15s ease, border-color .15s ease, background .15s ease;
}
.lang-switch:hover {
  color: var(--fg);
  border-color: rgba(124, 92, 255, 0.5);
  background: rgba(124, 92, 255, 0.1);
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 11px 18px; border-radius: 10px; font-weight: 600; font-size: 14px;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
  border: 1px solid transparent;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  color: white;
  box-shadow: 0 10px 30px rgba(124, 92, 255, 0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 36px rgba(124, 92, 255, 0.45); }
.btn-ghost {
  background: rgba(255,255,255,0.04); border-color: var(--line); color: var(--fg);
}
.btn-ghost:hover { background: rgba(255,255,255,0.08); }

/* Hero */
main { padding: 0 6vw; }
.hero {
  padding: 90px 0 80px;
  text-align: left;
  max-width: 980px;
  margin: 0 auto;
}
.hero-logo {
  width: clamp(160px, 22vw, 240px);
  height: auto;
  display: block;
  margin: 0 0 32px;
  filter: drop-shadow(0 20px 50px rgba(124, 92, 255, 0.35));
  animation: float 6s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.badge {
  display: inline-block;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  margin-bottom: 28px;
  background: rgba(255,255,255,0.02);
}
.hero h1 {
  font-size: clamp(38px, 6vw, 72px);
  line-height: 1.05;
  letter-spacing: -0.03em;
  font-weight: 800;
  margin-bottom: 24px;
}
.grad {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 50%, var(--accent-3) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lead {
  font-size: 19px; color: var(--muted); max-width: 720px; margin-bottom: 36px;
}
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 48px; }
.cta-row.center { justify-content: center; }

.code {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
  font-size: 13.5px; line-height: 1.7;
  overflow-x: auto;
  box-shadow: 0 30px 60px -30px rgba(0,0,0,0.6);
}
.c-comment { color: #6b7280; }
.c-cmd { color: var(--accent-2); user-select: none; margin-right: 8px; }
.c-out { color: #cbd5e1; }

/* Sections */
.section { padding: 80px 0; max-width: 1100px; margin: 0 auto; border-top: 1px solid var(--line); }
.section.center { text-align: center; }
.section h2 {
  font-size: clamp(28px, 3.5vw, 40px);
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  font-weight: 700;
}
.sub { color: var(--muted); font-size: 17px; margin-bottom: 40px; }
.section.center .sub { margin-left: auto; margin-right: auto; max-width: 600px; }

/* Cards */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  transition: transform .2s ease, border-color .2s ease, background .2s ease;
}
.card:hover {
  transform: translateY(-4px);
  border-color: rgba(124, 92, 255, 0.4);
  background: rgba(30, 25, 50, 0.5);
}
.card-icon { font-size: 28px; margin-bottom: 14px; }
.card h3 { font-size: 18px; margin-bottom: 8px; font-weight: 600; }
.card p { color: var(--muted); font-size: 14.5px; }
.card code {
  font-size: 12.5px; padding: 2px 6px; border-radius: 4px;
  background: rgba(124, 92, 255, 0.15); color: #c4b5fd;
}

/* Architecture diagram */
.arch { display: flex; flex-direction: column; align-items: center; gap: 14px; }
.arch-row { display: flex; gap: 14px; flex-wrap: wrap; justify-content: center; width: 100%; }
.arch-row.split > * { flex: 1; min-width: 220px; }
.arch-box {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 22px;
  text-align: center;
  font-size: 14.5px;
  color: var(--fg);
}
.arch-box em { color: var(--accent-3); font-style: normal; font-weight: 600; }
.arch-box.accent {
  border-color: rgba(34, 211, 238, 0.4);
  background: rgba(34, 211, 238, 0.06);
}
.arch-box.big { width: 100%; padding: 22px; }
.arch-box.big strong { font-size: 16px; display: block; margin-bottom: 14px; }
.arch-arrow { color: var(--muted); font-size: 13px; font-family: 'JetBrains Mono', monospace; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; }
.chips span {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(124, 92, 255, 0.12);
  color: #c4b5fd;
  font-family: 'JetBrains Mono', monospace;
}

/* Stack */
.stack {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
}
.stack > div {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
  display: flex; flex-direction: column; gap: 4px;
}
.stack b { color: var(--fg); font-size: 14px; }
.stack span { color: var(--muted); font-size: 13.5px; font-family: 'JetBrains Mono', monospace; }

/* Footer */
footer {
  border-top: 1px solid var(--line);
  padding: 30px 6vw;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  margin-top: 60px;
}

/* Responsive */
@media (max-width: 720px) {
  .nav nav { display: none; }
  .nav { padding: 18px 6vw; }
  .hero { padding: 60px 0 40px; }
  .section { padding: 60px 0; }
}