:root {
  --bg: #141526;
  --bg2: #1a1d35;
  --text: #ffffff;
  --muted: #9aa3b8;
  --line: #2a2f45;
  --go-start: #1cbfff;
  --go-end: #5b21b6;
  --header-h: 56px;
  --font: "Segoe UI", "PingFang SC", "Helvetica Neue", sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { min-height: 100%; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: 0; background: none; color: inherit; }

.st-header {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  border-bottom: 1px solid var(--line);
  background: rgba(20, 21, 38, 0.96);
  position: sticky;
  top: 0;
  z-index: 10;
}
.st-logo {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.03em;
}
.st-logo em { font-style: normal; color: var(--go-start); font-weight: 700; }
.st-nav { display: flex; align-items: center; gap: 20px; font-size: 14px; color: var(--muted); }
.st-nav a:hover { color: #fff; }
.st-lang {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-size: 13px;
  font-weight: 600;
}
.st-lang svg { width: 18px; height: 18px; opacity: 0.9; }

.st-main {
  min-height: calc(100vh - var(--header-h));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 20px 56px;
  text-align: center;
  background:
    radial-gradient(ellipse 80% 50% at 50% 40%, rgba(91, 33, 182, 0.22), transparent 60%),
    radial-gradient(ellipse 60% 40% at 50% 60%, rgba(28, 191, 255, 0.12), transparent 55%),
    var(--bg);
}

.st-resources {
  background: linear-gradient(180deg, #f3f5fa 0%, #eef1f7 100%);
  color: #1a2744;
  padding: 56px 20px 40px;
  border-top: 1px solid #dfe5f0;
}
.st-resources-inner {
  max-width: 980px;
  margin: 0 auto;
}
.st-feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px 20px;
  margin-bottom: 40px;
}
.st-feature {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 8px 10px 4px;
  text-align: center;
  border-radius: 16px;
  transition: transform 0.2s ease, background 0.2s ease;
}
.st-feature:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.7);
}
.st-feature-art {
  width: 120px;
  height: 88px;
  display: grid;
  place-items: center;
  filter: drop-shadow(0 10px 18px rgba(26, 39, 68, 0.12));
}
.st-feature-art svg { width: 120px; height: 88px; }
.st-feature-label {
  font-size: 15px;
  font-weight: 650;
  line-height: 1.35;
  color: #1a2744;
  max-width: 200px;
}
.st-link-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  padding-top: 8px;
  border-top: 1px solid #d9e0ec;
}
.st-link-item {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 10px;
  font-size: 13px;
  font-weight: 600;
  color: #334155;
  border-radius: 12px;
  transition: color 0.15s ease, background 0.15s ease;
}
.st-link-item:hover {
  color: #0ea5e9;
  background: rgba(14, 165, 233, 0.08);
}
.st-link-ico {
  width: 22px;
  height: 22px;
  color: #1cbfff;
  flex-shrink: 0;
}
.st-link-ico svg { width: 22px; height: 22px; display: block; }

.st-foot {
  background: #f3f5fa;
  border-top: 1px solid #dfe5f0;
  color: #7a8499;
}
.st-status {
  font-size: 15px;
  color: var(--muted);
  margin-bottom: 28px;
  min-height: 22px;
}
.st-go-wrap { position: relative; margin-bottom: 32px; }
.st-go {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--go-start), var(--go-end));
  color: #fff;
  font-size: 42px;
  font-weight: 800;
  letter-spacing: 0.06em;
  box-shadow: 0 12px 40px rgba(28, 191, 255, 0.35), 0 0 0 8px rgba(28, 191, 255, 0.08);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.st-go:hover {
  transform: scale(1.04);
  box-shadow: 0 16px 48px rgba(28, 191, 255, 0.45), 0 0 0 10px rgba(28, 191, 255, 0.12);
}
.st-go:active { transform: scale(0.98); }
.st-tabs {
  display: inline-flex;
  gap: 4px;
  background: var(--bg2);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px;
  margin-bottom: 36px;
}
.st-tab {
  padding: 8px 18px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
}
.st-tab.active { background: #2a3050; color: #fff; }
.st-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(100px, 140px));
  gap: 24px;
  margin-bottom: 8px;
}
.st-metric-label { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 6px; }
.st-metric-val { font-size: 28px; font-weight: 700; color: #fff; }
.st-metric-unit { font-size: 14px; color: var(--muted); font-weight: 500; }
.st-foot {
  padding: 20px;
  text-align: center;
  font-size: 12px;
}
.st-foot a { color: #0ea5e9; }

@media (max-width: 860px) {
  .st-feature-grid { grid-template-columns: repeat(2, 1fr); gap: 22px 14px; }
  .st-link-row { grid-template-columns: 1fr; gap: 4px; }
  .st-link-item { justify-content: flex-start; padding-left: 8px; }
}
@media (max-width: 640px) {
  .st-nav a.hide-m { display: none; }
  .st-go { width: 150px; height: 150px; font-size: 34px; }
  .st-metrics { gap: 12px; }
  .st-metric-val { font-size: 22px; }
  .st-feature-grid { grid-template-columns: 1fr; }
  .st-resources { padding: 40px 16px 28px; }
  .st-main { min-height: auto; padding: 36px 16px 48px; }
}