:root {
  color-scheme: dark;
  --bg-deep: #0b0413;
  --bg-main: #14071f;
  --panel: rgba(53, 20, 79, 0.58);
  --text: #f8f4ff;
  --muted: #cbb8de;
  --accent: #facc15;
  --accent-2: #f59e0b;
  --border: rgba(250, 204, 21, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  background:
    radial-gradient(circle at 10% 12%, rgba(168, 85, 247, 0.28), transparent 26%),
    radial-gradient(circle at 90% 16%, rgba(250, 204, 21, 0.14), transparent 22%),
    linear-gradient(135deg, var(--bg-deep) 0%, #1b0b2e 48%, var(--bg-main) 100%);
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
}

.doc-shell {
  width: min(920px, calc(100% - 28px));
  margin: 0 auto;
  padding: 28px 0 72px;
}

.doc-topbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.doc-brand {
  margin: 0;
  font-size: 14px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
}

.doc-link-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.doc-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
}

.doc-link:hover {
  border-color: rgba(250, 204, 21, 0.34);
}

.doc-card {
  padding: 24px 20px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02)),
    var(--panel);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.34);
  backdrop-filter: blur(18px);
}

h1,
h2 {
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(28px, 4.4vw, 42px);
  line-height: 1.12;
}

h2 {
  margin-top: 24px;
  font-size: clamp(20px, 3vw, 28px);
}

p {
  margin: 0;
  line-height: 1.9;
  color: rgba(248, 244, 255, 0.9);
}

.doc-lead {
  color: var(--muted);
  margin-bottom: 14px;
}

.doc-list {
  margin: 10px 0 0;
  padding-left: 18px;
  color: rgba(248, 244, 255, 0.9);
}

.doc-list li {
  margin: 8px 0;
  line-height: 1.8;
}

.doc-note {
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: 12px;
  background: rgba(250, 204, 21, 0.08);
  border: 1px solid rgba(250, 204, 21, 0.18);
  color: #fff1bc;
}

.faq-group {
  margin-top: 16px;
  display: grid;
  gap: 12px;
}

.faq-item {
  padding: 14px;
  border-radius: 14px;
  border: 1px solid rgba(250, 204, 21, 0.14);
  background: rgba(255, 255, 255, 0.03);
}

.faq-item h3 {
  margin: 0 0 6px;
  font-size: 17px;
}

.doc-footer {
  margin-top: 18px;
  font-size: 13px;
  color: rgba(203, 184, 222, 0.75);
}