:root {
  color-scheme: dark;
  font-family: "Microsoft YaHei UI", "PingFang SC", "Noto Sans CJK SC", "Segoe UI", sans-serif;
  background: #0f1319;
  color: #edf1f5;
  --panel: #171c24;
  --panel-2: #1e252f;
  --line: #2a323d;
  --muted: #8d97a6;
  --sales: #49c98d;
  --tech: #3fb8e8;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(circle at 10% 0, color-mix(in srgb, var(--accent) 12%, transparent), transparent 34rem),
    #0f1319;
}
a { color: inherit; }
.wrap { width: min(1080px, calc(100% - 40px)); margin: 0 auto; }
header { padding: 56px 0 48px; border-bottom: 1px solid var(--line); }
.back { display: inline-block; margin-bottom: 42px; color: var(--muted); text-decoration: none; }
.back:hover { color: #fff; }
.eyebrow { margin: 0 0 12px; color: var(--accent); font-size: 12px; letter-spacing: .12em; text-transform: uppercase; }
h1 { max-width: 760px; margin: 0; font-size: clamp(36px, 6vw, 62px); line-height: 1.08; }
.meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.meta span { padding: 7px 11px; color: #aab3bf; font-size: 12px; border: 1px solid var(--line); border-radius: 999px; }
nav { position: sticky; top: 0; z-index: 3; background: rgba(15, 19, 25, .92); border-bottom: 1px solid var(--line); backdrop-filter: blur(12px); }
nav .wrap { display: flex; gap: 8px; overflow-x: auto; padding-top: 12px; padding-bottom: 12px; }
nav a { padding: 7px 11px; color: var(--muted); font-size: 12px; text-decoration: none; white-space: nowrap; border-radius: 999px; }
nav a:hover { color: #fff; background: var(--panel-2); }
main { padding: 24px 0 88px; }
section { padding: 42px 0; border-bottom: 1px solid var(--line); }
.section-no { color: var(--accent); font-size: 12px; letter-spacing: .1em; }
h2 { margin: 8px 0 20px; font-size: clamp(25px, 4vw, 36px); }
h3 { margin: 0 0 10px; font-size: 18px; }
p { color: #aab3bf; line-height: 1.75; }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card { padding: 22px; background: var(--panel); border: 1px solid var(--line); border-radius: 14px; }
.card b { color: var(--accent); }
.card p { margin: 0; font-size: 14px; }
.flow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; }
.flow div { padding: 18px 12px; text-align: center; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; }
.flow b { display: block; margin-bottom: 5px; color: var(--accent); }
table { width: 100%; border-collapse: collapse; background: var(--panel); border: 1px solid var(--line); }
th, td { padding: 14px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
th { color: var(--accent); font-size: 12px; letter-spacing: .06em; }
td { color: #aab3bf; line-height: 1.6; }
.exercise { padding: 26px; background: color-mix(in srgb, var(--accent) 8%, var(--panel)); border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--line)); border-radius: 16px; }
.exercise ol { margin: 14px 0 0; padding-left: 20px; color: #c0c7cf; line-height: 1.9; }
.output { margin-top: 18px; padding: 14px 16px; color: #dce2e8; background: var(--panel-2); border-left: 3px solid var(--accent); }
.callout { margin: 18px 0; padding: 18px 20px; color: #cbd2da; line-height: 1.7; background: color-mix(in srgb, var(--accent) 7%, var(--panel)); border: 1px solid color-mix(in srgb, var(--accent) 24%, var(--line)); border-radius: 13px; }
.callout b { color: var(--accent); }
.steps { counter-reset: training-step; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.step { counter-increment: training-step; padding: 20px; background: var(--panel); border: 1px solid var(--line); border-radius: 13px; }
.step::before { content: counter(training-step, decimal-leading-zero); display: block; margin-bottom: 16px; color: var(--accent); font-size: 12px; letter-spacing: .1em; }
.step p { margin: 0; font-size: 14px; }
.checklist { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin: 0; padding: 0; list-style: none; }
.checklist li { padding: 14px 16px 14px 42px; position: relative; color: #c0c7cf; line-height: 1.55; background: var(--panel); border: 1px solid var(--line); border-radius: 11px; }
.checklist li::before { content: "✓"; position: absolute; left: 16px; color: var(--accent); font-weight: 700; }
.template { display: grid; grid-template-columns: 150px 1fr; border: 1px solid var(--line); border-bottom: 0; }
.template b, .template span { padding: 14px 16px; border-bottom: 1px solid var(--line); }
.template b { color: var(--accent); background: var(--panel-2); }
.template span { color: #aab3bf; background: var(--panel); line-height: 1.6; }
.quiz { display: grid; gap: 10px; }
details { background: var(--panel); border: 1px solid var(--line); border-radius: 11px; }
summary { padding: 16px 18px; color: #dce2e8; cursor: pointer; }
details p { margin: 0; padding: 0 18px 18px; }
.badge { display: inline-block; padding: 4px 8px; color: var(--accent); font-size: 11px; border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--line)); border-radius: 999px; }
@media (max-width: 760px) {
  .grid, .grid.two, .flow, .steps, .checklist { grid-template-columns: 1fr; }
  .template { grid-template-columns: 1fr; }
  .template b { padding-bottom: 6px; border-bottom: 0; }
  header { padding-top: 32px; }
  .back { margin-bottom: 28px; }
  table { display: block; overflow-x: auto; }
}