:root {
  --bg: #f5f7fb;
  --bg-soft: #eef1f8;
  --card: #ffffff;
  --text: #1c2230;
  --muted: #6b7280;
  --border: #e4e8f0;
  --brand: #5b5bf0;
  --brand-2: #8b5cf6;
  --brand-grad: linear-gradient(135deg, #5b5bf0 0%, #8b5cf6 100%);
  --ok: #16a34a;
  --warn: #f59e0b;
  --err: #ef4444;
  --radius: 14px;
  --shadow: 0 6px 24px rgba(30, 41, 99, 0.08);
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1118; --bg-soft: #161b26; --card: #171c28; --text: #e6e9f0;
    --muted: #9aa3b2; --border: #262d3d; --shadow: 0 6px 24px rgba(0,0,0,.35);
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg); color: var(--text); line-height: 1.6; -webkit-font-smoothing: antialiased;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

/* 顶栏 */
.topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 14px;
  padding: 12px 20px; background: color-mix(in srgb, var(--card) 88%, transparent);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 9px; font-weight: 800; font-size: 18px; letter-spacing: .3px; }
.brand .dot { width: 26px; height: 26px; border-radius: 8px; background: var(--brand-grad); display: grid; place-items: center; color: #fff; font-size: 15px; }
.brand small { font-weight: 600; color: var(--muted); font-size: 12px; margin-left: 2px; }
.nav { display: flex; gap: 6px; margin-left: auto; flex-wrap: wrap; }
.nav a {
  padding: 7px 13px; border-radius: 999px; color: var(--muted); font-size: 14px; font-weight: 600;
}
.nav a:hover { background: var(--bg-soft); text-decoration: none; color: var(--text); }
.nav a.active { background: var(--brand-grad); color: #fff; }
.menu-btn { display: none; }

.container { max-width: 1080px; margin: 0 auto; padding: 28px 20px 64px; }
.container-wide { max-width: 1280px; }

/* 标题区 */
.hero { padding: 18px 0 26px; }
.hero h1 { font-size: clamp(26px, 4vw, 40px); margin: 0 0 8px; line-height: 1.2; }
.hero p { color: var(--muted); margin: 0; font-size: 16px; max-width: 720px; }
.grad-text { background: var(--brand-grad); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* 卡片网格 */
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; box-shadow: var(--shadow); transition: transform .15s ease, box-shadow .15s ease;
}
.card:hover { transform: translateY(-2px); }
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }
.card .ico { font-size: 26px; margin-bottom: 8px; display: block; }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; gap: 7px; cursor: pointer; border: 1px solid var(--border);
  background: var(--card); color: var(--text); padding: 9px 16px; border-radius: 10px; font-size: 14px;
  font-weight: 600; transition: .15s; font-family: inherit;
}
.btn:hover { border-color: var(--brand); }
.btn-primary { background: var(--brand-grad); color: #fff; border: none; }
.btn-primary:hover { filter: brightness(1.06); color: #fff; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* 表单 */
.input, textarea.input, select.input {
  width: 100%; padding: 11px 13px; border: 1px solid var(--border); border-radius: 10px;
  background: var(--bg); color: var(--text); font-size: 15px; font-family: inherit; resize: vertical;
}
.input:focus { outline: 2px solid color-mix(in srgb, var(--brand) 40%, transparent); border-color: var(--brand); }
label.field { display: block; font-weight: 600; font-size: 14px; margin: 14px 0 6px; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

/* 徽标/标签 */
.badge { display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 12px; font-weight: 700; background: var(--bg-soft); color: var(--muted); }
.badge.brand { background: color-mix(in srgb, var(--brand) 14%, transparent); color: var(--brand); }
.badge.ok { background: color-mix(in srgb, var(--ok) 16%, transparent); color: var(--ok); }
.badge.warn { background: color-mix(in srgb, var(--warn) 16%, transparent); color: var(--warn); }

/* 通用工具 */
.muted { color: var(--muted); }
.center { text-align: center; }
.mt { margin-top: 18px; } .mb { margin-bottom: 18px; }
pre.code {
  background: var(--bg-soft); border: 1px solid var(--border); border-radius: 10px; padding: 14px;
  overflow: auto; font-family: var(--mono); font-size: 13px; line-height: 1.5;
}
.notice { background: color-mix(in srgb, var(--warn) 12%, transparent); border: 1px solid color-mix(in srgb, var(--warn) 35%, transparent); color: var(--text); padding: 12px 14px; border-radius: 10px; font-size: 14px; }

/* 移动端抽屉导航 */
@media (max-width: 760px) {
  .nav { display: none; position: fixed; top: 56px; right: 12px; flex-direction: column;
    background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 8px; box-shadow: var(--shadow); z-index: 60; }
  .nav.open { display: flex; }
  .menu-btn { display: inline-flex; margin-left: auto; }
}