/* ── Variables ── */
:root {
  --bg: #08090c;
  --bg2: #0e1018;
  --bg3: #141720;
  --border: rgba(255,255,255,.08);
  --border2: rgba(255,255,255,.14);
  --text: #e8eaf0;
  --muted: #7a8099;
  --muted2: #a0a8bf;
  --accent: #6c63ff;
  --accent2: #8b5cf6;
  --accent3: #22d3ee;
  --green: #10b981;
  --yellow: #f59e0b;
  --red: #ef4444;
  --radius: 12px;
  --radius2: 20px;
  --shadow: 0 4px 32px rgba(0,0,0,.5);
  --glow: 0 0 60px rgba(108,99,255,.18);
}

/* ── 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: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Noto Sans SC', sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; }
button { cursor: pointer; font: inherit; }
ul { list-style: none; }

/* ── Layout ── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 100px 0; }
.section-sm { padding: 60px 0; }

/* ── Typography ── */
.label-tag {
  display: inline-flex; align-items: center; gap: 6px;
  background: rgba(108,99,255,.12); border: 1px solid rgba(108,99,255,.3);
  color: #a78bfa; font-size: 12px; font-weight: 600; letter-spacing: .08em;
  text-transform: uppercase; padding: 5px 12px; border-radius: 100px;
  margin-bottom: 20px;
}
.label-tag.green {
  background: rgba(16,185,129,.1); border-color: rgba(16,185,129,.3); color: #34d399;
}
.label-tag.cyan {
  background: rgba(34,211,238,.1); border-color: rgba(34,211,238,.3); color: #22d3ee;
}
h1, h2, h3 { line-height: 1.2; }
.hero-title {
  font-size: clamp(2.4rem, 5vw, 4rem); font-weight: 800; letter-spacing: -.02em;
}
.section-title {
  font-size: clamp(1.8rem, 3vw, 2.6rem); font-weight: 700; letter-spacing: -.02em; margin-bottom: 16px;
}
.section-sub {
  font-size: 1.1rem; color: var(--muted2); max-width: 560px;
}
.gradient-text {
  background: linear-gradient(135deg, #a78bfa 0%, #22d3ee 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px; border-radius: 10px; font-size: 15px; font-weight: 600;
  border: none; transition: all .2s;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff; box-shadow: 0 4px 20px rgba(108,99,255,.4);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 28px rgba(108,99,255,.55); }
.btn-outline {
  background: transparent; color: var(--text);
  border: 1px solid var(--border2);
}
.btn-outline:hover { background: rgba(255,255,255,.05); border-color: rgba(255,255,255,.25); }
.btn-green {
  background: linear-gradient(135deg, #059669, #10b981);
  color: #fff; box-shadow: 0 4px 20px rgba(16,185,129,.35);
}
.btn-green:hover { transform: translateY(-1px); box-shadow: 0 6px 28px rgba(16,185,129,.5); }
.btn-lg { padding: 16px 32px; font-size: 16px; border-radius: 12px; }
.btn-sm { padding: 8px 16px; font-size: 13px; border-radius: 8px; }

/* ── Cards ── */
.card {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: var(--radius2); padding: 32px;
}
.card:hover { border-color: var(--border2); }
.card-sm { padding: 24px; border-radius: var(--radius); }

/* ── Nav ── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(8,9,12,.85); backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px; max-width: 1200px; margin: 0 auto; padding: 0 24px;
}
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 18px; font-weight: 800; letter-spacing: -.02em;
}
.nav-logo .logo-icon {
  width: 32px; height: 32px; border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent3));
  display: flex; align-items: center; justify-content: center;
  font-size: 16px;
}
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  padding: 8px 14px; border-radius: 8px; font-size: 14px; color: var(--muted2);
  transition: all .15s;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); background: rgba(255,255,255,.06); }
.nav-cta { display: flex; align-items: center; gap: 10px; }
.nav-mobile-btn { display: none; background: none; border: none; color: var(--text); font-size: 22px; }

/* ── Footer ── */
footer {
  border-top: 1px solid var(--border); padding: 60px 0 40px;
  background: var(--bg);
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px;
  margin-bottom: 48px;
}
.footer-brand p { color: var(--muted); font-size: 14px; margin-top: 12px; max-width: 300px; line-height: 1.7; }
.footer-col h4 { font-size: 13px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin-bottom: 16px; }
.footer-col a { display: block; font-size: 14px; color: var(--muted2); margin-bottom: 10px; transition: color .15s; }
.footer-col a:hover { color: var(--text); }
.footer-bottom {
  border-top: 1px solid var(--border); padding-top: 28px;
  display: flex; align-items: center; justify-content: space-between;
  font-size: 13px; color: var(--muted);
}

/* ── Code block ── */
.code-block {
  background: var(--bg3); border: 1px solid var(--border);
  border-radius: 12px; padding: 20px 24px;
  font-family: 'SF Mono', 'Fira Code', Consolas, monospace;
  font-size: 13px; line-height: 1.8; overflow-x: auto;
}
.code-block .kw { color: #c792ea; }
.code-block .str { color: #c3e88d; }
.code-block .cmt { color: #546e7a; }
.code-block .num { color: #f78c6c; }
.code-block .fn { color: #82aaff; }
.code-block .var { color: #ffcb6b; }

/* ── Status badge ── */
.badge {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 3px 10px; border-radius: 100px; font-size: 12px; font-weight: 600;
}
.badge-green { background: rgba(16,185,129,.15); color: #34d399; }
.badge-blue { background: rgba(108,99,255,.15); color: #a78bfa; }
.badge-yellow { background: rgba(245,158,11,.15); color: #fbbf24; }

/* ── Grid helpers ── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

/* ── Divider ── */
.divider { width: 48px; height: 3px; border-radius: 2px; background: linear-gradient(90deg, var(--accent), var(--accent3)); margin: 20px 0 32px; }

/* ── Tab ── */
.tabs { display: flex; gap: 4px; background: var(--bg3); border-radius: 12px; padding: 4px; margin-bottom: 32px; }
.tab-btn {
  flex: 1; padding: 10px 20px; border-radius: 9px; border: none;
  background: transparent; color: var(--muted2); font-size: 14px; font-weight: 500;
  transition: all .2s; cursor: pointer;
}
.tab-btn.active { background: var(--bg2); color: var(--text); box-shadow: var(--shadow); }

/* ── Highlight box ── */
.highlight-box {
  background: linear-gradient(135deg, rgba(108,99,255,.08), rgba(34,211,238,.08));
  border: 1px solid rgba(108,99,255,.2);
  border-radius: var(--radius2); padding: 40px;
}

/* ── Stats ── */
.stat-num { font-size: 2.5rem; font-weight: 800; line-height: 1; }
.stat-label { font-size: 14px; color: var(--muted2); margin-top: 6px; }

/* ── Step ── */
.step-num {
  width: 36px; height: 36px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 800; flex-shrink: 0;
}

/* ── Animations ── */
@keyframes float { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-12px)} }
@keyframes pulse-ring {
  0%{transform:scale(.95);opacity:1} 100%{transform:scale(1.6);opacity:0}
}
@keyframes shimmer {
  0%{background-position:-200% 0} 100%{background-position:200% 0}
}
.float-anim { animation: float 4s ease-in-out infinite; }

/* ── Glow effects ── */
.glow-purple { box-shadow: 0 0 40px rgba(108,99,255,.3); }
.glow-cyan { box-shadow: 0 0 40px rgba(34,211,238,.25); }
.glow-green { box-shadow: 0 0 40px rgba(16,185,129,.25); }

/* ── Responsive ── */
@media (max-width: 960px) {
  .grid-3, .grid-4 { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .nav-mobile-btn { display: block; }
  .section { padding: 64px 0; }
  .hero-title { font-size: 2rem; }
}