.page-home {
  --home-card-bg: #FFFDF8;
  --home-rail-w: 132px;
  background: var(--paper);
  color: var(--ink);
}

.page-home .home-frame {
  display: grid;
  gap: var(--gap);
  padding-block: clamp(26px, 5vw, 56px) clamp(72px, 10vw, 132px);
}

/* ---------- 左栏章节索引 ---------- */
.page-home .home-rail {
  position: relative;
  border-bottom: 1px solid var(--edge);
  padding-bottom: 14px;
}

.page-home .rail-tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--ink-2);
}

.page-home .rail-list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-home .rail-list::-webkit-scrollbar {
  display: none;
}

.page-home .rail-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 7px 13px;
  border: 1px solid var(--edge);
  border-radius: 999px;
  background: transparent;
  color: var(--ink-2);
  font-size: 13px;
  text-decoration: none;
  transition: border-color 0.24s ease, color 0.24s ease, background-color 0.24s ease;
}

.page-home .rail-link:hover {
  border-color: var(--gold);
  color: var(--ink);
}

.page-home .rail-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gold);
}

.page-home .rail-note {
  display: none;
}

/* ---------- 首屏 ---------- */
.page-home .hero-section {
  padding-top: clamp(6px, 2vw, 18px);
}

.page-home .hero-split {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(10px, 2vw, 18px);
}

.page-home .hero-title {
  margin: 14px 0 22px;
  font-size: clamp(46px, 9vw, 118px);
  line-height: 0.92;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--ink);
}

.page-home .hero-lede {
  max-width: 46ch;
  font-size: clamp(16px, 1.6vw, 18px);
  color: var(--ink-2);
}

.page-home .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 34px);
}

.page-home .hero-figure {
  margin: 0;
  justify-self: start;
  width: min(100%, 360px);
}

.page-home .figure-frame img,
.page-home img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 数据带 ---------- */
.page-home .stat-band {
  margin: clamp(40px, 7vw, 76px) 0 0;
  padding: clamp(22px, 3.6vw, 38px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 30px);
  background: var(--midnight);
  border: 1px solid rgba(62, 224, 206, 0.26);
  border-radius: var(--radius);
  box-shadow: var(--shadow-2);
}

.page-home .stat-item {
  margin: 0;
  border-left: 1px solid rgba(200, 160, 44, 0.4);
  padding-left: 14px;
}

.page-home .stat-item dt {
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: rgba(247, 242, 232, 0.66);
}

.page-home .stat-item dd {
  margin: 8px 0 0;
  font-size: 13.5px;
  color: var(--paper);
}

.page-home .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1;
  color: var(--neon);
  letter-spacing: -0.01em;
}

/* ---------- 通用章节 ---------- */
.page-home .section + .section {
  margin-top: var(--space-sec);
}

.page-home .sec-head {
  max-width: 70ch;
}

.page-home .sec-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--crimson);
}

.page-home .sec-title {
  margin: 10px 0 14px;
  font-size: clamp(27px, 4.4vw, 46px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  font-weight: 900;
  color: var(--ink);
}

.page-home .section-lede,
.page-home .scene-lede,
.page-home .support-lede {
  margin: 0;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--ink-2);
}

/* ---------- 七步 ---------- */
.page-home .steps-figure {
  margin: clamp(24px, 4vw, 40px) 0 0;
}

.page-home .step-list {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 1.8vw, 20px);
  grid-template-columns: minmax(0, 1fr);
}

.page-home .step-card {
  padding: 20px 18px 16px;
  background: var(--home-card-bg);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  transform: rotate(-0.8deg);
  transition: transform 0.28s ease, border-color 0.28s ease, box-shadow 0.28s ease;
}

.page-home .step-card:hover,
.page-home .step-card:focus-within {
  transform: rotate(0deg) translateY(-2px);
  border-color: var(--gold);
  box-shadow: var(--shadow-2);
}

.page-home .step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--crimson);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 16px;
  letter-spacing: 0.02em;
}

.page-home .step-title {
  margin: 14px 0 8px;
  font-size: 19px;
  line-height: 1.35;
  font-weight: 900;
  color: var(--ink);
}

.page-home .step-line {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-home .step-fold {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--edge);
}

.page-home .step-fold summary {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--ink-2);
}

.page-home .step-fold summary::-webkit-details-marker {
  display: none;
}

.page-home .step-fold summary::after {
  content: "→";
  margin-left: auto;
  font-family: var(--font-mono);
  color: var(--gold);
  transition: transform 0.25s ease;
}

.page-home .step-fold[open] summary::after {
  transform: rotate(90deg);
}

.page-home .step-fold p {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-2);
}

/* ---------- 计分与换桌 ---------- */
.page-home .score-duo {
  margin-top: clamp(26px, 4vw, 44px);
}

.page-home .score-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: clamp(22px, 3vw, 32px);
}

.page-home .score-card .btn {
  margin-top: auto;
  align-self: flex-start;
}

.page-home .score-card--dark {
  background: var(--midnight);
  border-color: rgba(62, 224, 206, 0.3);
  color: var(--paper);
}

.page-home .score-card--dark .card-title {
  color: var(--paper);
}

.page-home .card-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-home .tick-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-home .tick-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.8;
}

.page-home .tick-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 9px;
  height: 1px;
  background: var(--gold);
}

.page-home .score-card--dark .tick-list li {
  color: rgba(247, 242, 232, 0.82);
}

.page-home .score-figure {
  margin: clamp(24px, 4vw, 40px) 0 0;
  max-width: 900px;
}

/* ---------- 版本脉络 ---------- */
.page-home .version-track {
  position: relative;
  list-style: none;
  margin: clamp(30px, 4.5vw, 50px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

.page-home .version-track::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--edge), var(--gold), var(--neon));
}

.page-home .version-node {
  position: relative;
  padding-left: 58px;
}

.page-home .version-tag {
  position: absolute;
  left: 0;
  top: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--paper);
  border: 1px solid var(--gold);
  color: var(--crimson);
  font-family: var(--font-mono);
  font-size: 14px;
}

.page-home .version-title {
  margin: 8px 0 6px;
  font-size: 18px;
  line-height: 1.35;
  font-weight: 900;
  color: var(--ink);
}

.page-home .version-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-home .versions-link {
  margin-top: clamp(26px, 4vw, 40px);
}

/* ---------- 使用场景 ---------- */
.page-home .scene-figure {
  margin: 0;
}

.page-home .scene-copy {
  margin-top: clamp(24px, 4vw, 38px);
  max-width: 64ch;
}

.page-home .scene-points {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-home .scene-points li {
  padding-left: 16px;
  border-left: 2px solid var(--gold);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-home .scene-points strong {
  display: block;
  margin-bottom: 2px;
  color: var(--ink);
  font-weight: 900;
}

.page-home .scene-trust {
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-2);
}

.page-home .scene-copy .btn {
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---------- 服务支持 ---------- */
.page-home .support-card {
  padding: clamp(24px, 4vw, 46px);
  background: var(--paper);
  border: 1px solid var(--edge);
  border-top: 3px solid var(--crimson);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
}

.page-home .support-grid {
  margin-top: clamp(24px, 3.6vw, 36px);
}

.page-home .support-item {
  padding: 16px 18px;
  border: 1px solid var(--edge);
  border-radius: var(--radius-sm);
  background: var(--home-card-bg);
}

.page-home .support-item h3 {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--crimson);
}

.page-home .support-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-2);
}

.page-home .support-note {
  margin: clamp(22px, 3vw, 30px) 0 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--ink-2);
}

.page-home .support-card .btn {
  margin-top: clamp(22px, 3vw, 32px);
}

/* ---------- 焦点与动效 ---------- */
.page-home a:focus-visible,
.page-home summary:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 3px;
  border-radius: 4px;
}

.page-home .rail-link[data-active="true"] {
  border-color: var(--gold);
  background: rgba(200, 160, 44, 0.1);
  color: var(--ink);
}

.page-home .rail-link[data-active="true"] .rail-num {
  color: var(--crimson);
}

@media (prefers-reduced-motion: reduce) {
  .page-home * {
    transition: none !important;
    animation: none !important;
  }
}

/* ---------- 平板 ---------- */
@media (min-width: 700px) {
  .page-home .step-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-home .step-card {
    transform: rotate(-1.2deg);
  }

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

@media (min-width: 860px) {
  .page-home .stat-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-home .hero-split {
    grid-template-columns: minmax(0, 1.35fr) minmax(240px, 0.75fr);
    align-items: end;
  }

  .page-home .hero-figure {
    width: 100%;
    justify-self: end;
  }
}

/* ---------- 桌面：左窄右宽分屏 ---------- */
@media (min-width: 1000px) {
  .page-home .home-frame {
    grid-template-columns: minmax(112px, 0.25fr) minmax(0, 0.75fr);
    column-gap: clamp(30px, 4.4vw, 68px);
    align-items: start;
  }

  .page-home .home-rail {
    position: sticky;
    top: clamp(88px, 12vh, 124px);
    display: flex;
    flex-direction: column;
    gap: 18px;
    padding-bottom: 0;
    border-bottom: 0;
  }

  .page-home .rail-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-home .rail-link {
    border: 0;
    border-bottom: 1px solid transparent;
    border-radius: 0;
    padding: 7px 0;
    gap: 10px;
    background: transparent;
  }

  .page-home .rail-link:hover {
    background: transparent;
    border-bottom-color: var(--gold);
  }

  .page-home .rail-link[data-active="true"] {
    background: transparent;
    border-bottom-color: var(--gold);
    color: var(--crimson);
  }

  .page-home .rail-note {
    display: block;
    writing-mode: vertical-rl;
    text-orientation: upright;
    margin: 8px 0 0;
    font-size: 12px;
    letter-spacing: 0.4em;
    color: var(--ink-2);
  }

  .page-home .rail-note.vertical {
    align-self: flex-start;
  }

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

  .page-home .step-card {
    transform: rotate(-1.5deg);
  }

  .page-home .version-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }

  .page-home .version-track::before {
    left: 8px;
    right: 8px;
    top: 21px;
    bottom: auto;
    width: auto;
    height: 1px;
    background: linear-gradient(90deg, var(--edge), var(--gold), var(--neon));
  }

  .page-home .version-node {
    padding: 0 clamp(16px, 2vw, 28px) 0 0;
  }

  .page-home .version-title {
    margin-top: 20px;
  }

  .page-home .scene-section {
    display: grid;
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr);
    gap: clamp(26px, 4vw, 56px);
    align-items: center;
  }

  .page-home .scene-copy {
    margin-top: 0;
    max-width: none;
  }
}

@media (min-width: 1240px) {
  .page-home .hero-title {
    letter-spacing: -0.03em;
  }
}