/* www：无侧栏，顶栏 + 赤陶色满幅 Hero，功能横向条，暖纸色，语音波形卡片 */
:root {
  --terra: #B23A1A;
  --terra-deep: #7A2410;
  --terra-soft: #D4653A;
  --paper: #F6EDE1;
  --sheet: #FFF8F0;
  --ink: #2A1C14;
  --muted: #6B5346;
  --line: #E2D0BE;
  --gold: #C9842A;
}

* { box-sizing: border-box; }
html { scroll-behavior: auto; }

body {
  margin: 0;
  font-family: Georgia, "Songti SC", "SimSun", "Microsoft YaHei", serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.75;
}

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

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 12px 32px;
  background: var(--sheet);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  font-weight: 700;
  font-size: 15px;
}

.brand svg { width: 28px; height: 28px; }

.topbar nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  font-size: 13px;
}

.topbar nav a {
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  color: var(--muted);
}

.topbar nav a:hover,
.topbar nav a:focus {
  color: var(--terra);
  border-bottom-color: var(--terra);
}

.hero-full {
  background: var(--terra);
  color: #FFF8F0;
  padding: 48px 32px 40px;
}

.hero-full h1 {
  margin: 0 0 16px;
  max-width: 18em;
  font-size: 34px;
  line-height: 1.3;
  font-weight: 700;
}

.hero-full p {
  margin: 0 0 12px;
  max-width: 46em;
  color: #F8E4D6;
  font-size: 16px;
}

.strip {
  display: flex;
  gap: 0;
  background: var(--terra-deep);
  color: #F6EDE1;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
}

.strip article {
  flex: 1;
  padding: 16px 18px;
  border-right: 1px solid rgba(246, 237, 225, 0.15);
}

.strip article:last-child { border-right: 0; }

.strip svg {
  width: 22px;
  height: 22px;
  display: block;
  margin-bottom: 8px;
}

.strip h3 {
  margin: 0 0 6px;
  font-size: 14px;
}

.strip p {
  margin: 0;
  font-size: 13px;
  color: #E8D2C2;
}

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 28px 32px 10px;
}

.wrap h2 {
  margin: 22px 0 12px;
  font-size: 24px;
  color: var(--terra-deep);
  line-height: 1.35;
}

.wrap > p {
  margin: 0 0 14px;
  color: var(--muted);
}

.wave-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.wave-card {
  background: var(--sheet);
  border: 1px solid var(--line);
  padding: 16px;
}

.wave-card:hover { border-color: var(--terra-soft); }

.wave {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 36px;
  margin-bottom: 10px;
}

.wave i {
  display: block;
  width: 4px;
  background: var(--terra);
  border-radius: 1px;
}

.wave-card h3 {
  margin: 0 0 8px;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  color: var(--terra-deep);
}

.wave-card p {
  margin: 0 0 8px;
  font-size: 14px;
  color: var(--muted);
}

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

.steps-row {
  display: flex;
  gap: 0;
  margin: 12px 0;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
}

.steps-row .step {
  flex: 1;
  background: var(--sheet);
  border: 1px solid var(--line);
  border-left: 5px solid var(--terra);
  padding: 14px 16px;
}

.steps-row .step b {
  display: block;
  color: var(--terra);
  font-size: 12px;
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}

.steps-row .step p { margin: 0; font-size: 14px; color: var(--muted); }

table.audio {
  width: 100%;
  border-collapse: collapse;
  background: var(--sheet);
  font-size: 14px;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  margin: 8px 0 14px;
}

table.audio th,
table.audio td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

table.audio th { background: var(--terra); color: #FFF8F0; }
table.audio tr:hover td { background: #F3E4D2; }

.pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.pair article {
  background: var(--sheet);
  border: 1px solid var(--line);
  padding: 16px;
}

.pair h3 {
  margin: 0 0 8px;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  color: var(--terra-deep);
}

.pair p { margin: 0 0 8px; color: var(--muted); font-size: 14px; }
.pair p:last-child { margin-bottom: 0; }

.icon-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.icon-card {
  background: var(--sheet);
  border: 1px solid var(--line);
  padding: 16px;
}

.icon-card:hover { border-color: var(--gold); }

.icon-card svg {
  width: 26px;
  height: 26px;
  color: var(--terra);
  display: block;
  margin-bottom: 8px;
}

.icon-card h3 {
  margin: 0 0 8px;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  font-size: 16px;
}

.icon-card p { margin: 0 0 8px; color: var(--muted); font-size: 14px; }
.icon-card p:last-child { margin-bottom: 0; }

.faq-list { margin: 8px 0 24px; }

.faq-item {
  background: var(--sheet);
  border-left: 4px solid var(--terra);
  padding: 12px 16px;
  margin-bottom: 10px;
}

.faq-item h3 {
  margin: 0 0 8px;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  color: var(--terra-deep);
}

.faq-item p { margin: 0 0 8px; color: var(--muted); font-size: 14px; }
.faq-item p:last-child { margin-bottom: 0; }

.site-foot {
  background: var(--terra-deep);
  color: #F6EDE1;
  padding: 28px 32px 36px;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  font-size: 13px;
}

.site-foot p { margin: 0 0 8px; max-width: 52em; }
.site-foot p:last-child { margin-bottom: 0; }

@media (max-width: 900px) {
  .topbar { flex-direction: column; align-items: flex-start; }
  .strip,
  .wave-row,
  .steps-row,
  .pair,
  .icon-grid { display: block; }
  .strip article,
  .steps-row .step { border-right: 0; border-bottom: 1px solid var(--line); }
}