.page-home {
  --home-shadow: 6px 6px 0 var(--obsidian);
  --home-shadow-sm: 4px 4px 0 var(--obsidian);
  position: relative;
  overflow-x: clip;
}

.page-home img {
  max-width: 100%;
  height: auto;
}

.page-home [data-reveal] {
  transition: opacity 0.3s ease, transform 0.3s ease;
}

/* ---------- 首屏 ---------- */
.page-home .hero {
  position: relative;
  padding: clamp(26px, 5vw, 58px) 0 clamp(30px, 5vw, 64px);
  border-bottom: var(--bw) solid var(--obsidian);
  overflow: hidden;
}

.page-home .hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-home .hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.34;
}

.page-home .hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 80% at 12% 6%, rgba(88, 213, 230, 0.18), transparent 58%),
    linear-gradient(180deg, rgba(10, 23, 48, 0.58) 0%, rgba(10, 23, 48, 0.97) 100%);
}

.page-home .hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-home .hero-title {
  margin: 12px 0 16px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.85rem, 5.4vw, 3.75rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--snow);
}

.page-home .hero-lede {
  max-width: 36ch;
  color: var(--text);
}

.page-home .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-home .beat {
  display: grid;
  gap: 14px;
  padding: clamp(16px, 3vw, 24px);
  border: var(--bw) solid var(--obsidian);
  background: linear-gradient(165deg, rgba(18, 41, 77, 0.96), rgba(10, 23, 48, 0.98));
  box-shadow: var(--home-shadow);
}

.page-home .beat-ring {
  display: block;
  width: clamp(132px, 34vw, 200px);
  height: auto;
  margin: 0 auto;
}

.page-home .ring-track {
  fill: none;
  stroke: var(--indigo);
  stroke-width: 12;
}

.page-home .ring-fill {
  fill: none;
  stroke: var(--ice);
  stroke-width: 12;
  stroke-dasharray: 330 190;
  transform: rotate(-90deg);
  transform-origin: 100px 100px;
}

.page-home .ring-ticks {
  fill: none;
  stroke: var(--haze);
  stroke-width: 6;
  stroke-dasharray: 3 39.7;
  transform: rotate(-90deg);
  transform-origin: 100px 100px;
}

.page-home .ring-num {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  fill: var(--fl-yellow);
  text-anchor: middle;
}

.page-home .ring-unit {
  font-family: var(--font-head);
  font-size: 11px;
  fill: var(--text-dim);
  text-anchor: middle;
}

.page-home .beat-meta {
  display: grid;
  gap: 5px;
  text-align: center;
}

.page-home .beat-meta .clock-label {
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

.page-home .beat-meta .clock-value {
  font-size: clamp(1.5rem, 5vw, 2rem);
  font-weight: 700;
  color: var(--fl-yellow);
  font-variant-numeric: tabular-nums;
}

.page-home .beat-note {
  margin: 4px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--text-dim);
}

/* ---------- 通用章节标题 ---------- */
.page-home .sec-head {
  display: grid;
  gap: 10px;
  max-width: 62ch;
  margin-bottom: clamp(24px, 4vw, 42px);
}

.page-home .section-title {
  position: relative;
  margin: 0;
  padding-bottom: 14px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.5rem, 4.2vw, 2.6rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--snow);
}

.page-home .section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 64px;
  height: 4px;
  background: var(--ice);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.3s ease;
}

.page-home .section[data-section].is-current .section-title::after {
  transform: scaleX(1);
}

.page-home .section[data-section] .eyebrow {
  color: var(--haze);
  transition: color 0.3s ease;
}

.page-home .section[data-section].is-current .eyebrow {
  color: var(--ice);
}

/* ---------- 章节预览 ---------- */
.page-home .toc {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--bw-thin) solid var(--line);
}

.page-home .toc-item {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr);
  gap: 6px 16px;
  padding: 20px 0;
  border-bottom: var(--bw-thin) solid var(--line);
  transition: background 0.3s ease;
}

.page-home .toc-index {
  grid-column: 1;
  grid-row: 1 / span 2;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--ice);
}

.page-home .toc-body {
  grid-column: 2;
}

.page-home .toc-side {
  grid-column: 2;
}

.page-home .toc-title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--snow);
}

.page-home .toc-text {
  margin: 0 0 10px;
  color: var(--text-dim);
  line-height: 1.8;
}

.page-home .toc-link {
  color: var(--ice);
  font-weight: 500;
  text-decoration: none;
  border-bottom: 2px solid rgba(88, 213, 230, 0.4);
  padding-bottom: 1px;
}

.page-home .toc-link:hover,
.page-home .toc-link:focus-visible {
  border-bottom-color: var(--ice);
}

/* ---------- 数据面板 ---------- */
.page-home .panel-grid {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-home .panel-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
  gap: 14px;
}

.page-home .pair-card {
  display: grid;
  gap: 8px;
  padding: 14px 16px 16px;
  border: var(--bw) solid var(--obsidian);
  background: linear-gradient(160deg, rgba(18, 41, 77, 0.98), rgba(10, 23, 48, 0.98));
  box-shadow: var(--home-shadow-sm);
}

.page-home .pair-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}

.page-home .pair-label {
  font-size: 13px;
  color: var(--text-dim);
}

.page-home .pair-stamp {
  font-size: 11px;
  color: var(--haze);
}

.page-home .pair-value {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0;
  font-size: clamp(1.5rem, 4.6vw, 2.15rem);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.page-home .pair-num {
  color: var(--text);
}

.page-home .pair-num--lead {
  color: var(--fl-yellow);
  font-weight: 700;
}

.page-home .pair-sep {
  color: var(--haze);
  font-size: 0.62em;
}

.page-home .more-metrics {
  grid-column: 1 / -1;
  border: var(--bw-thin) solid var(--line);
  background: rgba(10, 23, 48, 0.7);
  padding: 12px 16px;
}

.page-home .more-metrics summary {
  cursor: pointer;
  font-family: var(--font-head);
  font-weight: 700;
  color: var(--ice);
}

.page-home .more-metrics summary:focus-visible {
  outline: 2px solid var(--ice);
  outline-offset: 3px;
}

.page-home .mini-metrics {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-home .mini-metrics li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 14px;
  color: var(--text);
  border-bottom: 1px dashed var(--line-soft);
  padding-bottom: 6px;
}

.page-home .panel-fig {
  margin: 0;
}

.page-home .metric-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(24px, 4vw, 42px);
  border: var(--bw) solid var(--obsidian);
  background: var(--line);
  box-shadow: var(--home-shadow-sm);
}

.page-home .metric {
  display: grid;
  gap: 6px;
  padding: 18px 16px;
  background: var(--night);
}

.page-home .metric-num {
  font-size: clamp(1.6rem, 4.4vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--ice);
}

.page-home .metric-num--yellow {
  color: var(--fl-yellow);
}

.page-home .metric-num--green {
  color: var(--fl-green);
}

.page-home .metric-num--red {
  color: var(--fl-red);
}

.page-home .metric-label {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-dim);
}

/* ---------- 轮次区间 ---------- */
.page-home .rail-holder {
  border: var(--bw-thin) solid var(--line);
  background: rgba(18, 41, 77, 0.6);
  padding: 12px;
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-home .round-strip {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: thin;
}

.page-home .round-tab {
  flex: 0 0 auto;
  min-width: 52px;
  padding: 9px 14px;
  font-size: 14px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--text-dim);
  background: transparent;
  border: var(--bw-thin) solid var(--line);
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.page-home .round-tab:nth-child(5n + 1) { border-color: var(--fl-blue); }
.page-home .round-tab:nth-child(5n + 2) { border-color: var(--fl-white); }
.page-home .round-tab:nth-child(5n + 3) { border-color: var(--fl-red); }
.page-home .round-tab:nth-child(5n + 4) { border-color: var(--fl-green); }
.page-home .round-tab:nth-child(5n + 5) { border-color: var(--fl-yellow); }

.page-home .round-tab:hover {
  color: var(--snow);
}

.page-home .round-tab:focus-visible {
  outline: 3px solid var(--ice);
  outline-offset: 2px;
}

.page-home .round-tab[aria-pressed="true"] {
  background: var(--fl-yellow);
  border-color: var(--fl-yellow);
  color: var(--obsidian);
  font-weight: 700;
  box-shadow: var(--home-shadow-sm);
}

.page-home .round-body {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-home .round-body .img-frame {
  margin: 0;
}

.page-home .round-notes {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-home .round-notes li {
  position: relative;
  padding-left: 22px;
  color: var(--text);
  line-height: 1.8;
}

.page-home .round-notes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 10px;
  height: 10px;
  background: var(--ice);
  border: var(--bw-thin) solid var(--obsidian);
}

.page-home .round-aside .btn {
  display: inline-block;
}

/* ---------- 收藏夹 ---------- */
.page-home .bookmark-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-home .bookmark-copy .btn {
  display: inline-block;
  margin-top: 6px;
}

.page-home .steps {
  list-style: none;
  margin: 26px 0 24px;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-home .step {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr);
  gap: 14px;
  padding: 16px;
  border: var(--bw-thin) solid var(--line);
  background: rgba(10, 23, 48, 0.6);
}

.page-home .step-index {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--fl-yellow);
  line-height: 1.2;
}

.page-home .step-title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--snow);
}

.page-home .step-text {
  margin: 0;
  color: var(--text-dim);
  line-height: 1.78;
}

.page-home .bookmark-fig {
  margin: 0;
}

/* ---------- 帮助通道 ---------- */
.page-home .help-grid {
  display: grid;
  gap: 18px;
}

.page-home .help-card {
  display: grid;
  gap: 12px;
  align-content: start;
  padding: clamp(18px, 3vw, 26px);
  border: var(--bw) solid var(--obsidian);
  background: var(--indigo);
  box-shadow: var(--home-shadow);
}

.page-home .help-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.15rem, 3.4vw, 1.45rem);
  color: var(--snow);
}

.page-home .help-text {
  margin: 0;
  color: var(--text);
  line-height: 1.82;
}

.page-home .help-meta {
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line-soft);
  color: var(--ice);
  font-size: 14px;
  word-break: break-word;
}

.page-home .help-card .btn {
  justify-self: start;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-home .metric-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-home .hero-inner {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: clamp(24px, 3vw, 48px);
    align-items: start;
  }

  .page-home .hero-copy {
    grid-column: 2 / 9;
  }

  .page-home .hero-lede {
    max-width: 38ch;
  }

  .page-home .beat {
    grid-column: 10 / 13;
  }

  .page-home .toc-item {
    grid-template-columns: 3.6rem minmax(0, 1fr) 11rem;
    align-items: start;
    gap: 8px 24px;
  }

  .page-home .toc-index {
    grid-column: 1;
    grid-row: 1;
    font-size: 1.3rem;
  }

  .page-home .toc-body {
    grid-column: 2;
  }

  .page-home .toc-side {
    grid-column: 3;
    justify-self: end;
    text-align: right;
  }

  .page-home .toc-item:hover {
    background: rgba(18, 41, 77, 0.45);
  }

  .page-home .panel-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-home .round-body {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-home .bookmark-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: start;
  }

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

@media (min-width: 1100px) {
  .page-home .hero-copy {
    grid-column: 2 / 8;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-home .section-title::after,
  .page-home [data-reveal],
  .page-home .round-tab,
  .page-home .toc-item {
    transition: none;
  }

  .page-home .section-title::after {
    transform: scaleX(1);
  }
}