:root {
  color-scheme: light;
  --ink: #1f2328;
  --muted: #65717d;
  --line: #d8dee4;
  --paper: #f8f7f3;
  --panel: #fff;
  --accent: #7c3aed;
  --accent-dark: #4c1d95;
  --teal: #0f766e;
  --rose: #be3455;
  --gold: #b7791f;
  --soft-violet: #f1ebff;
  --soft-teal: #e9f8f5;
  --soft-gold: #fff8dc;
  --shadow: 0 16px 38px rgba(31, 35, 40, .08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    linear-gradient(135deg, rgba(124, 58, 237, .08), transparent 35%),
    linear-gradient(225deg, rgba(15, 118, 110, .08), transparent 38%),
    var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
}

button, a { font: inherit; }

button {
  min-height: 38px;
  padding: 0 14px;
  border: 1px solid rgba(255, 255, 255, .5);
  border-radius: 6px;
  color: #fff;
  background: rgba(255, 255, 255, .12);
  cursor: pointer;
}

button:hover { background: rgba(255, 255, 255, .2); }

.page {
  width: min(1240px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 42px;
}

.hero {
  overflow: hidden;
  border-radius: 8px;
  color: #fff;
  background:
    linear-gradient(120deg, rgba(26, 20, 51, .96), rgba(76, 29, 149, .92) 48%, rgba(15, 118, 110, .9)),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, .12) 0 2px, transparent 2px 52px);
  box-shadow: var(--shadow);
}

.hero nav {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 22px 0;
}

.hero nav a {
  min-height: 38px;
  padding: 8px 14px;
  border: 1px solid rgba(255, 255, 255, .5);
  border-radius: 6px;
  color: #fff;
  text-decoration: none;
}

.hero section { padding: 34px 32px 40px; }

.kicker {
  margin: 0 0 12px;
  color: rgba(255, 255, 255, .74);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
}

h1 {
  max-width: 940px;
  margin: 0;
  font-size: 44px;
  line-height: 1.14;
  letter-spacing: 0;
}

.hero p:last-child {
  max-width: 980px;
  margin: 16px 0 0;
  color: rgba(255, 255, 255, .88);
  font-size: 16px;
  line-height: 1.8;
}

.overview, .block, .sticky {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.overview {
  margin-top: 16px;
  padding: 18px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.overview article {
  min-width: 0;
  padding: 16px;
  border: 1px solid #ece6f8;
  border-radius: 8px;
  background: #fbfaff;
}

.overview span {
  display: block;
  margin-bottom: 8px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
}

.overview strong {
  display: block;
  font-size: 18px;
}

.layout {
  margin-top: 16px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 16px;
  align-items: start;
}

.content {
  display: grid;
  gap: 16px;
  min-width: 0;
}

.block {
  min-width: 0;
  padding: 22px;
}

h2 {
  margin: 0 0 16px;
  font-size: 24px;
  letter-spacing: 0;
}

h3 {
  margin: 0;
  font-size: 18px;
  letter-spacing: 0;
}

p {
  margin: 8px 0 0;
  line-height: 1.76;
}

.overview p, .block > p, .pattern p, .role-grid p, .key-grid p, .note p {
  color: var(--muted);
}

b { color: var(--ink); }

.role-grid, .key-grid {
  margin-top: 14px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.key-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.role-grid article, .key-grid article {
  padding: 15px;
  border: 1px solid #e6edf2;
  border-radius: 8px;
  background: #fbfcfd;
}

.pattern {
  margin-top: 16px;
  padding: 16px;
  border: 1px solid #e7ddff;
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  background: #fcfaff;
}

pre {
  overflow-x: auto;
  margin: 12px 0;
  padding: 14px;
  border: 1px solid #e0d7f3;
  border-radius: 8px;
  color: #241a3f;
  background: var(--soft-violet);
  line-height: 1.65;
}

code {
  font-family: Consolas, "Courier New", monospace;
  font-size: 14px;
}

.chord-table {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.chord-table div {
  min-height: 92px;
  padding: 14px;
  border: 1px solid #dce7ea;
  border-radius: 8px;
  background: var(--soft-teal);
  display: grid;
  align-content: center;
  gap: 8px;
}

.chord-table b {
  font-size: 24px;
  color: var(--teal);
}

.chord-table span {
  color: var(--muted);
}

.steps {
  margin: 12px 0 0;
  padding-left: 22px;
}

li {
  margin: 8px 0;
  line-height: 1.72;
}

.week {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.week article {
  padding: 14px;
  border: 1px solid #e6edf2;
  border-radius: 8px;
  background: #fbfcfd;
  display: grid;
  gap: 6px;
}

.week b {
  color: var(--accent);
}

.week span {
  color: var(--muted);
  line-height: 1.65;
}

.pitfalls {
  margin: 0;
  padding-left: 22px;
}

.side { min-width: 0; }

.sticky {
  position: sticky;
  top: 16px;
  padding: 18px;
}

.note {
  padding: 14px;
  border: 1px solid #e6edf2;
  border-radius: 8px;
  background: #fbfcfd;
}

.note + .note { margin-top: 12px; }

.note strong {
  display: block;
  color: var(--accent-dark);
}

.note.warning {
  border-color: rgba(183, 121, 31, .26);
  background: var(--soft-gold);
}

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

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

  .sticky { position: static; }
}

@media (max-width: 640px) {
  .page {
    width: min(100% - 20px, 1240px);
    padding-top: 10px;
  }

  .hero nav {
    flex-direction: column;
    padding: 14px 14px 0;
  }

  .hero section { padding: 26px 18px 28px; }

  h1 { font-size: 32px; }
  .block, .overview, .sticky { padding: 16px; }
  .chord-table { grid-template-columns: 1fr; }
}

@media print {
  body { background: #fff; }
  .page { width: 100%; padding: 0; }
  .hero, .overview, .block, .sticky { box-shadow: none; }
  .hero {
    color: var(--ink);
    background: #fff;
    border: 1px solid var(--line);
  }
  .hero nav { display: none; }
  .hero p:last-child, .kicker { color: var(--muted); }
  .layout { display: block; }
  .side { margin-top: 16px; }
  .block, .overview, .pattern { break-inside: avoid; }
}