:root {
  --ink: #1f2933;
  --muted: #5d6878;
  --line: #d8dee8;
  --paper: #ffffff;
  --soft: #f5f7fb;
  --blue: #2563eb;
  --green: #17845b;
  --amber: #b7791f;
  --red: #b42318;
  --violet: #6d5bd0;
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: #eef2f7;
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  line-height: 1.68;
}

a {
  color: inherit;
  text-decoration: none;
}

.layout {
  display: grid;
  grid-template-columns: 268px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 22px 16px;
  background: #172033;
  color: #edf3ff;
  overflow: auto;
}

.brand {
  padding: 0 8px 18px;
  border-bottom: 1px solid rgba(255, 255, 255, .14);
}

.brand strong {
  display: block;
  font-size: 20px;
  line-height: 1.25;
}

.brand span {
  display: block;
  margin-top: 8px;
  color: #b9c5d8;
  font-size: 13px;
}

.nav {
  display: grid;
  gap: 6px;
  margin-top: 18px;
}

.nav a {
  display: block;
  padding: 9px 10px;
  border-radius: 6px;
  color: #dbe5f7;
  font-size: 14px;
}

.nav a:hover,
.nav a.active {
  background: rgba(255, 255, 255, .12);
  color: #ffffff;
}

.content {
  min-width: 0;
  padding-bottom: 92px;
}

.hero {
  padding: 44px 52px 32px;
  background:
    linear-gradient(120deg, rgba(37, 99, 235, .10), rgba(23, 132, 91, .10)),
    var(--paper);
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--blue);
  font-weight: 700;
  font-size: 14px;
}

h1 {
  margin: 0;
  max-width: 980px;
  font-size: 34px;
  line-height: 1.22;
  letter-spacing: 0;
}

.lead {
  max-width: 980px;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 18px;
}

.section {
  padding: 32px 52px;
}

.section + .section {
  border-top: 1px solid var(--line);
}

h2 {
  margin: 0 0 16px;
  font-size: 24px;
  line-height: 1.3;
}

h3 {
  margin: 0 0 10px;
  font-size: 18px;
  line-height: 1.35;
}

p {
  margin: 0 0 12px;
}

ul,
ol {
  margin: 8px 0 0;
  padding-left: 22px;
}

.grid {
  display: grid;
  gap: 16px;
}

.grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid.four {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
}

.card p:last-child,
.note p:last-child {
  margin-bottom: 0;
}

.note {
  margin-top: 16px;
  padding: 16px 18px;
  border-left: 4px solid var(--blue);
  background: var(--paper);
}

.audio-panel {
  display: grid;
  grid-template-columns: auto auto minmax(160px, 1fr) auto auto auto;
  gap: 10px;
  align-items: center;
  position: fixed;
  left: 268px;
  right: 0;
  bottom: 0;
  z-index: 20;
  padding: 12px;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, .96);
  box-shadow: 0 -8px 24px rgba(31, 41, 51, .08);
  backdrop-filter: blur(8px);
}

.audio-title {
  font-weight: 700;
  color: var(--ink);
}

.audio-button {
  min-width: 40px;
  height: 36px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #ffffff;
  color: var(--ink);
  cursor: pointer;
  font: inherit;
}

.audio-button:hover {
  border-color: var(--blue);
  color: var(--blue);
}

.audio-progress {
  width: 100%;
  accent-color: var(--blue);
  cursor: pointer;
}

.audio-time {
  min-width: 96px;
  color: var(--muted);
  font-size: 13px;
  text-align: right;
  white-space: nowrap;
}

.warning {
  border-left-color: var(--amber);
}

.danger {
  border-left-color: var(--red);
}

.success {
  border-left-color: var(--green);
}

.tag {
  display: inline-block;
  margin: 0 6px 6px 0;
  padding: 4px 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #f8fafc;
  font-size: 13px;
  white-space: nowrap;
}

.tag.green {
  border-color: rgba(23, 132, 91, .24);
  background: rgba(23, 132, 91, .08);
  color: var(--green);
}

.tag.amber {
  border-color: rgba(183, 121, 31, .28);
  background: rgba(183, 121, 31, .10);
  color: var(--amber);
}

.tag.red {
  border-color: rgba(180, 35, 24, .28);
  background: rgba(180, 35, 24, .08);
  color: var(--red);
}

.tag.blue {
  border-color: rgba(37, 99, 235, .25);
  background: rgba(37, 99, 235, .08);
  color: var(--blue);
}

.flow {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 10px;
  margin-top: 18px;
}

.step {
  min-height: 84px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

.step b {
  display: block;
  margin-bottom: 6px;
  color: var(--blue);
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

th,
td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: #e9eef7;
  font-weight: 700;
}

tr:last-child td {
  border-bottom: 0;
}

.matrix {
  display: grid;
  gap: 12px;
}

.matrix-row {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 12px;
  align-items: stretch;
}

.matrix-title {
  padding: 14px;
  border-radius: var(--radius);
  background: #22304a;
  color: #fff;
  font-weight: 700;
}

.matrix-cells {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

.case {
  border-left: 4px solid var(--violet);
}

.footer {
  padding: 24px 52px 38px;
  color: var(--muted);
  font-size: 13px;
}

code {
  padding: 2px 5px;
  border-radius: 4px;
  background: #edf2f7;
  font-family: Consolas, monospace;
}

@media (max-width: 980px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
  }

  .content {
    padding-bottom: 170px;
  }

  .nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero,
  .section,
  .footer {
    padding-left: 24px;
    padding-right: 24px;
  }

  .grid.two,
  .grid.three,
  .grid.four,
  .flow {
    grid-template-columns: 1fr;
  }

  .audio-panel {
    left: 0;
    grid-template-columns: auto auto auto;
  }

  .audio-title,
  .audio-progress,
  .audio-time {
    grid-column: 1 / -1;
  }

  .matrix-row {
    grid-template-columns: 1fr;
  }
}