:root {
  --bg: #070b16;
  --bg-alt: #0c1224;
  --card: #0e1731;
  --text: #ffffff;
  --muted: #d4def3;
  --text-strong: #ffffff;
  --muted-strong: #eef3ff;
  --primary: #4c8df8;
  --primary-600: #3a72d8;
  --accent: #20d6b0;
  --accent-600: #16b899;
  --border: #223254;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-alt) 100%);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3 { color: var(--text-strong); }
p { color: var(--text); line-height: 1.8; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--accent-600); }
a:focus { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(10, 15, 30, 0.8);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand { font-weight: 700; letter-spacing: 0.4px; }
.nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 16px;
  padding: 10px 12px;
  border-radius: 8px;
}
.nav a:hover { color: var(--text); background: rgba(36,48,86,0.4); }
.nav .cta { color: var(--text); background: var(--primary); }
.nav .cta:hover { background: var(--primary-600); }

.hero { padding: 96px 0 64px; background: radial-gradient(1000px 500px at 10% -10%, rgba(76,141,248,0.16), transparent 60%), radial-gradient(800px 400px at 90% 0%, rgba(32,214,176,0.10), transparent 60%); }
.hero-wrap { text-align: center; }
.hero h1 { font-size: 40px; line-height: 1.2; margin: 0 0 16px; text-shadow: 0 2px 12px rgba(0,0,0,0.45); letter-spacing: 0.2px; }
.hero p { max-width: 860px; margin: 0 auto 24px; color: var(--muted-strong); }
.hero-actions { display: flex; gap: 12px; justify-content: center; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 18px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn.primary { background: linear-gradient(90deg, var(--primary), var(--accent)); color: #fff; }
.btn.primary:hover { background: linear-gradient(90deg, var(--primary-600), var(--accent-600)); transform: translateY(-1px); box-shadow: 0 10px 28px rgba(76,141,248,0.28); }
.btn.secondary { background: rgba(36,48,86,0.5); color: var(--text); }
.btn.secondary:hover { background: rgba(36,48,86,0.7); transform: translateY(-1px); }

.section { padding: 64px 0; }
.section.alt { background: linear-gradient(180deg, rgba(36,48,86,0.18) 0%, rgba(36,48,86,0.08) 100%); }
.section h2 { font-size: 28px; margin: 0 0 24px; }
.section p, .section li { color: var(--text); }

.section { position: relative; }
.section.patterned { background: none; } 
.section.patterned::before { content: ""; position: absolute; inset: 0; pointer-events: none; background: none; }

.section.gradient { background: radial-gradient(900px 420px at 10% 50%, rgba(76,141,248,0.18), transparent 60%), radial-gradient(900px 420px at 90% 0%, rgba(32,214,176,0.14), transparent 60%); }
.gradient h2 { color: var(--text-strong); }

.section.banded { background: none; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section .container { background: #0b1224; border: 1px solid var(--border); border-radius: 16px; padding: 24px; }
.section.patterned .container, .section.banded .container { background: #0b1224; box-shadow: 0 16px 32px rgba(0,0,0,0.35); }
.section.patterned h2, .section.banded h2 { color: var(--text-strong); text-shadow: 0 2px 12px rgba(0,0,0,0.45); }

.grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.card {
  background: #0f1a36;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  min-height: 160px;
  box-shadow: 0 12px 24px rgba(11, 17, 35, 0.35);
}
.card h3 { margin: 0 0 8px; font-size: 19px; font-weight: 700; color: var(--text-strong); }
.card p { margin: 0; color: var(--text); }

.grid .card:nth-child(2n) { background: #0f1a36; }
.grid .card:nth-child(3n) { background: #0f1a36; border-color: var(--border); }

.steps { display: grid; grid-template-columns: 1fr; gap: 12px; }
.step { display: grid; grid-template-columns: 56px 1fr; gap: 16px; align-items: start; background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 20px; }
.step-index { display: flex; align-items: center; justify-content: center; height: 56px; border-radius: 12px; background: rgba(79,124,255,0.2); color: var(--text); font-weight: 700; font-size: 18px; }
.step-body h3 { margin: 0 0 8px; font-size: 18px; }
.step-body p { margin: 0; color: var(--text); }

.best-practices { margin-top: 24px; background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 20px; }
.best-practices h3 { margin: 0 0 8px; font-size: 18px; }
.best-practices ul { margin: 0; padding-left: 18px; color: var(--text); }

.code {
  background: #0c1328;
  color: #d6e4ff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
  overflow-x: auto;
  line-height: 1.5;
}

.contact { text-align: center; }

.tags { display: flex; gap: 8px; justify-content: center; margin-top: 20px; flex-wrap: wrap; }
.tag { display: inline-flex; align-items: center; height: 32px; padding: 0 12px; border-radius: 999px; background: rgba(76,141,248,0.22); color: var(--text-strong); border: 1px solid rgba(76,141,248,0.45); font-weight: 600; }

.badge-group { display: flex; gap: 8px; margin: 12px 0 8px; }
.badge { display: inline-flex; align-items: center; height: 28px; padding: 0 10px; border-radius: 999px; border: 1px solid var(--border); background: #0f1a36; color: var(--text-strong); font-size: 12px; font-weight: 700; letter-spacing: 0.4px; }
.badge.accent { color: #122219; background: rgba(32,214,176,0.85); border-color: rgba(32,214,176,0.95); }
.badge.muted { opacity: 0.95; color: var(--muted-strong); }

#features .container,
#solutions .container { background: #ffffff; color: #0a0f1e; border-color: #d9e0ff; }
#features h2,
#solutions h2 { color: #0a0f1e; text-shadow: none; }
#features .badge,
#solutions .badge { background: #f3f7ff; color: #0a0f1e; border-color: #e3e9ff; }
#features .card,
#solutions .card { background: #ffffff; border-color: #e3e9ff; box-shadow: 0 8px 16px rgba(18,25,49,0.08); }
#features .card h3,
#solutions .card h3 { color: #0a0f1e; }
#features .card p,
#solutions .card p { color: #2b3b5f; }

#faq .container { background: #ffffff; color: #0a0f1e; border-color: #d9e0ff; }
#faq h2 { color: #0a0f1e; text-shadow: none; }
#faq details { background: #ffffff; border-color: #e3e9ff; box-shadow: 0 8px 16px rgba(18,25,49,0.08); }
#faq details summary { color: #0a0f1e; font-weight: 600; }
#faq details p { color: #2b3b5f; }

.cta-banner { padding: 40px 0; background: radial-gradient(800px 240px at 20% 50%, rgba(32,214,176,0.12), transparent 60%), radial-gradient(800px 240px at 80% 0%, rgba(76,141,248,0.12), transparent 60%); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.cta-banner-wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 20px; }
.cta-banner-text h3 { margin: 0 0 6px; font-size: 20px; }
.cta-banner-text p { margin: 0; color: var(--muted); }

details { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 12px 16px; }
details summary { color: var(--text-strong); cursor: pointer; }
details[open] summary { color: var(--text-strong); }
details p { color: var(--text); margin-top: 8px; }

.site-footer { border-top: 1px solid var(--border); padding: 20px 0; }
.footer-wrap { display: flex; align-items: center; justify-content: space-between; }
.footer-links a { color: var(--muted); text-decoration: none; margin-left: 16px; }
.footer-links a:hover { color: var(--text); }

@media (max-width: 1024px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
  .cta-banner-wrap { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 640px) {
  .header-wrap { height: 56px; }
  .hero h1 { font-size: 28px; }
  .grid { grid-template-columns: 1fr; }
  .section .container { padding: 16px; }
  .badge-group { flex-wrap: wrap; }
  .step { grid-template-columns: 44px 1fr; gap: 12px; padding: 16px; }
  .step-index { height: 44px; font-size: 16px; }
  .code { white-space: pre-wrap; word-break: break-word; font-size: 13px; }
  .footer-wrap { flex-direction: column; gap: 12px; }
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f8ff;
    --bg-alt: #eef2ff;
    --card: #ffffff;
    --text: #0a0f1e;
    --muted: #40547a;
    --text-strong: #0a0f1e;
    --muted-strong: #2b3b5f;
    --border: #d9e0ff;
  }
  body { background: linear-gradient(180deg, var(--bg) 0%, var(--bg-alt) 100%); }
  .nav a:hover { background: rgba(79,124,255,0.08); }
  .btn.secondary { background: rgba(79,124,255,0.12); }
  .btn.secondary:hover { background: rgba(79,124,255,0.18); }
  .section .container { background: rgba(255,255,255,0.85); }
}