:root {
  --bg: #0b1220;
  --panel: #121a2b;
  --panel2: #182236;
  --text: #e8eefc;
  --muted: #9aa8c7;
  --line: #24304a;
  --brand: #5b8cff;
  --brand2: #3dd6c6;
  --ok: #3ecf8e;
  --warn: #f5a524;
  --danger: #ff6b7a;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --radius: 16px;
  --font: "PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background: radial-gradient(1200px 600px at 10% -10%, #1a2744 0%, transparent 55%),
              radial-gradient(900px 500px at 100% 0%, #13263a 0%, transparent 50%),
              var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { width: min(1080px, 92vw); margin: 0 auto; }
.nav {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(12px);
  background: rgba(11,18,32,.78);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 0; gap: 16px;
}
.logo {
  font-weight: 800; letter-spacing: .02em;
  color: var(--text); text-decoration: none;
  display: flex; align-items: center; gap: 8px;
}
.logo span {
  display: inline-grid; place-items: center;
  width: 28px; height: 28px; border-radius: 8px;
  background: linear-gradient(135deg, var(--brand), var(--brand2));
  color: #061018; font-size: 14px;
}
.nav-links { display: flex; flex-wrap: wrap; gap: 14px; font-size: 14px; }
.nav-links a { color: var(--muted); text-decoration: none; }
.nav-links a:hover { color: var(--text); }
.hero { padding: 48px 0 24px; }
.hero h1 {
  font-size: clamp(28px, 5vw, 42px);
  line-height: 1.2; margin: 0 0 12px;
}
.hero p { color: var(--muted); margin: 0 0 24px; max-width: 640px; font-size: 16px; }
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px; border-radius: 999px;
  background: rgba(91,140,255,.12); color: #b7cbff;
  border: 1px solid rgba(91,140,255,.35);
  font-size: 12px; margin-bottom: 14px;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px; padding: 8px 0 40px;
}
.card {
  background: linear-gradient(180deg, var(--panel), var(--panel2));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  transition: transform .15s ease, border-color .15s ease;
}
a.card { color: inherit; text-decoration: none; display: block; }
a.card:hover { transform: translateY(-2px); border-color: #3a4d75; text-decoration: none; }
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }
.tag {
  display: inline-block; margin-top: 12px;
  font-size: 12px; color: var(--brand2);
}
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
  margin: 18px 0 28px;
}
.panel h2 { margin: 0 0 16px; font-size: 20px; }
label { display: block; font-size: 13px; color: var(--muted); margin: 12px 0 6px; }
input, select, textarea {
  width: 100%;
  background: #0d1524;
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 10px;
  padding: 11px 12px;
  font: inherit;
  outline: none;
}
input:focus, select:focus, textarea:focus { border-color: var(--brand); }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 700px) { .row { grid-template-columns: 1fr; } .nav-links { display: none; } }
.btn {
  appearance: none; border: 0; cursor: pointer;
  background: linear-gradient(135deg, var(--brand), #7aa2ff);
  color: #061018; font-weight: 700;
  border-radius: 12px; padding: 12px 16px;
  margin-top: 16px; font: inherit;
}
.btn.secondary {
  background: transparent; color: var(--text);
  border: 1px solid var(--line);
}
.btn:active { transform: scale(.98); }
.result {
  margin-top: 18px; padding: 16px;
  border-radius: 12px;
  background: rgba(61,214,198,.08);
  border: 1px solid rgba(61,214,198,.25);
}
.result .big {
  font-size: 28px; font-weight: 800; color: var(--brand2);
  margin: 4px 0 8px;
}
.result .muted { color: var(--muted); font-size: 13px; }
.metric-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px; margin-top: 12px;
}
.metric {
  background: #0d1524; border: 1px solid var(--line);
  border-radius: 10px; padding: 12px;
}
.metric .k { font-size: 12px; color: var(--muted); }
.metric .v { font-size: 18px; font-weight: 700; margin-top: 4px; }
.note {
  color: var(--muted); font-size: 13px; margin-top: 10px;
}
.footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 40px; color: var(--muted); font-size: 13px;
}
.footer a { color: var(--muted); }
.ads-slot {
  margin: 20px 0;
  border: 1px dashed #35507a;
  border-radius: 12px;
  padding: 18px;
  text-align: center;
  color: #7f92b8;
  background: rgba(255,255,255,.02);
  font-size: 13px;
}
.seo-block {
  color: var(--muted); font-size: 14px;
  padding-bottom: 40px;
}
.seo-block h2 { color: var(--text); font-size: 18px; }
.toast {
  position: fixed; bottom: 24px; right: 24px;
  background: #1b2a1f; color: var(--ok);
  border: 1px solid rgba(62,207,142,.4);
  padding: 10px 14px; border-radius: 10px;
  opacity: 0; transform: translateY(8px);
  transition: .2s ease; pointer-events: none;
}
.toast.show { opacity: 1; transform: none; }
code, .mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  word-break: break-all;
}