.page-home {
  background: var(--paper-50);
  color: var(--graphite-700);
}

.page-home .home-shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(84px, 11vw, 118px) var(--gutter) 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

/* ——— 目录轴 ——— */
.page-home .home-rail {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 0 0 16px;
  border-bottom: 1px solid var(--hairline);
  scrollbar-width: none;
}
.page-home .home-rail::-webkit-scrollbar {
  display: none;
}
.page-home .home-rail .rail__label {
  display: none;
}
.page-home .home-rail .rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-home .home-rail .rail-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pill);
  background: #ffffff;
  color: var(--indigo-700);
  font-size: var(--fs-14);
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color .28s var(--ease), color .28s var(--ease), border-color .28s var(--ease);
}
.page-home .home-rail .rail-link__code {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 500;
  letter-spacing: .06em;
  color: var(--copper-600);
}
.page-home .home-rail .rail-link:hover {
  border-color: var(--copper-400);
}
.page-home .home-rail .rail-link.is-active {
  background: var(--indigo-700);
  border-color: var(--indigo-700);
  color: var(--paper-50);
}
.page-home .home-rail .rail-link.is-active .rail-link__code {
  color: var(--copper-400);
}

/* ——— 主区 ——— */
.page-home .home-main {
  min-width: 0;
  padding-bottom: clamp(56px, 7vw, 96px);
}

.page-home .home-crumb {
  margin: clamp(20px, 3vw, 32px) 0 0;
}

.page-home .home-crumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .06em;
  color: var(--slate-400);
}
.page-home .home-crumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--copper-600);
}
.page-home .home-crumb a {
  color: var(--indigo-500);
  text-decoration: none;
}
.page-home .home-crumb a:hover {
  color: var(--copper-600);
}

/* ——— 首屏 ——— */
.page-home .home-hero {
  padding: clamp(32px, 5vw, 64px) 0 clamp(48px, 6vw, 88px);
}

.page-home .home-hero__inner {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-home .home-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 5.4vw, 3.9rem);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--ink-900);
  margin: 14px 0 22px;
  max-width: 17ch;
}

.page-home .home-hero .lede {
  margin: 0;
  max-width: 60ch;
  font-size: var(--fs-18);
  line-height: 1.78;
  color: var(--indigo-500);
}

.page-home .home-hero__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--hairline-copper);
  border-radius: var(--radius-l);
  overflow: hidden;
  box-shadow: var(--shadow-m);
  background: linear-gradient(158deg, var(--indigo-700) 0%, var(--ink-900) 100%);
}

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

.page-home .home-hero__media .watermark {
  position: absolute;
  right: 16px;
  bottom: 40px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .12em;
  color: var(--copper-400);
  opacity: .75;
}

.page-home .home-hero__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 12px 18px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .06em;
  color: var(--paper-50);
  background: linear-gradient(to top, rgba(16, 20, 43, .9), rgba(16, 20, 43, 0));
}

/* ——— 章节预览卡 ——— */
.page-home .home-hero__preview {
  margin-top: clamp(32px, 5vw, 60px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-home .preview-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-m);
  background: #ffffff;
  box-shadow: var(--shadow-s);
  color: inherit;
  text-decoration: none;
  transition: transform .32s var(--ease), box-shadow .32s var(--ease), border-color .32s var(--ease);
}
.page-home .preview-card:hover,
.page-home .preview-card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--copper-400);
  box-shadow: var(--shadow-m);
}
.page-home .preview-card__code {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--copper-600);
}
.page-home .preview-card__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-18);
  line-height: 1.4;
  letter-spacing: -.01em;
  color: var(--ink-900);
}
.page-home .preview-card p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--slate-400);
}

/* ——— 通用区块 ——— */
.page-home .home-section {
  position: relative;
  padding: clamp(48px, 6vw, 88px) 0;
  border-top: 1px solid var(--hairline);
}
.page-home .home-section::after {
  content: "";
  position: absolute;
  top: -1px;
  right: 0;
  width: 170px;
  height: 1px;
  background-image: radial-gradient(var(--copper-400) 1px, transparent 1px);
  background-size: 9px 1px;
  opacity: .55;
  pointer-events: none;
}

.page-home .section__head {
  max-width: 66ch;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-home .section-title {
  margin: 10px 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.55rem, 3.6vw, 2.45rem);
  line-height: 1.22;
  letter-spacing: -.02em;
  color: var(--ink-900);
}

.page-home .home-section .lede {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.78;
  color: var(--indigo-500);
  max-width: 62ch;
}

.page-home .prose {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--graphite-700);
  max-width: 66ch;
}

.page-home .meta-mono {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .06em;
  color: var(--slate-400);
}

/* ——— 错位栅格 ——— */
.page-home .home-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 56px);
  align-items: start;
}

.page-home .home-split__body {
  min-width: 0;
}

.page-home .home-split__media {
  margin: 0;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-m);
  overflow: hidden;
  box-shadow: var(--shadow-s);
  background: var(--indigo-100);
}

/* ——— 编号拆解 ——— */
.page-home .code-split {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--hairline);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}
.page-home .code-split__item {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 16px 14px 16px 0;
  background: var(--paper-50);
  border-left: 2px solid var(--copper-600);
  padding-left: 16px;
  transition: background-color .28s var(--ease);
}
.page-home .code-split__item:hover {
  background: #ffffff;
}
.page-home .code-split__num {
  font-family: var(--font-mono);
  font-size: var(--fs-24);
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--copper-600);
  line-height: 1.2;
}
.page-home .code-split__label {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-16);
  color: var(--ink-900);
}
.page-home .code-split__desc {
  margin: 4px 0 0;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--slate-400);
}

/* ——— 数据行 ——— */
.page-home .fact-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 16px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}
.page-home .fact-row li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-s);
  background: var(--indigo-100);
}
.page-home .fact-row__num {
  font-family: var(--font-mono);
  font-size: var(--fs-32);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--indigo-700);
}
.page-home .fact-row__label {
  font-size: var(--fs-14);
  color: var(--graphite-700);
}

/* ——— 版本面板 ——— */
.page-home .ver-panel {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-top: 26px;
  padding: 18px 20px 20px 22px;
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--copper-600);
  border-radius: var(--radius-s);
  background: #ffffff;
  box-shadow: var(--shadow-s);
}
.page-home .ver-panel .ver-badge {
  flex: 0 0 auto;
  padding: 6px 12px;
  border: 1px solid var(--copper-400);
  border-radius: var(--radius-pill);
  background: var(--ink-900);
  color: var(--copper-400);
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  font-weight: 500;
  letter-spacing: .08em;
}
.page-home .ver-panel__text {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.72;
  color: var(--graphite-700);
}

.page-home .fold {
  margin-top: 22px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-s);
  background: #ffffff;
  overflow: hidden;
}
.page-home .fold > summary {
  cursor: pointer;
  padding: 15px 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-16);
  color: var(--ink-900);
  list-style: none;
}
.page-home .fold > summary::-webkit-details-marker {
  display: none;
}
.page-home .fold > summary::after {
  content: "＋";
  float: right;
  font-family: var(--font-mono);
  color: var(--copper-600);
}
.page-home .fold[open] > summary::after {
  content: "－";
}
.page-home .fold[open] {
  border-left: 3px solid var(--copper-400);
}
.page-home .fold__body {
  padding: 0 18px 18px;
}

.page-home .rev-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}
.page-home .rev-list li {
  display: grid;
  gap: 4px;
  padding-top: 12px;
  border-top: 1px solid var(--hairline);
}
.page-home .rev-list__code {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  font-weight: 500;
  letter-spacing: .06em;
  color: var(--copper-600);
}
.page-home .rev-list p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.72;
  color: var(--graphite-700);
}

/* ——— 案例与记录入口 ——— */
.page-home .home-paths__banner {
  margin: 0 0 clamp(24px, 3vw, 40px);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-m);
  overflow: hidden;
  box-shadow: var(--shadow-s);
  background: var(--ink-900);
}

.page-home .path-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-home .path-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 26px 24px 24px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-m);
  background: #ffffff;
  box-shadow: var(--shadow-s);
  text-decoration: none;
  color: inherit;
  transition: transform .32s var(--ease), box-shadow .32s var(--ease), border-color .32s var(--ease);
}
.page-home .path-card:hover,
.page-home .path-card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--copper-400);
  box-shadow: var(--shadow-m);
}
.page-home .path-card__code {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .1em;
  color: var(--copper-600);
}
.page-home .path-card__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.25rem, 2.4vw, 1.6rem);
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--ink-900);
}
.page-home .path-card p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.78;
  color: var(--graphite-700);
}
.page-home .path-card__more {
  margin-top: auto;
  padding-top: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .08em;
  color: var(--indigo-500);
}
.page-home .path-card:hover .path-card__more {
  color: var(--copper-600);
}

.page-home .path-aside {
  margin: clamp(20px, 3vw, 30px) 0 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--slate-400);
}
.page-home .path-aside a {
  color: var(--indigo-500);
  text-decoration: none;
  border-bottom: 1px solid var(--hairline-strong);
}
.page-home .path-aside a:hover {
  color: var(--copper-600);
  border-bottom-color: var(--copper-400);
}

/* ——— 咨询区 ——— */
.page-home .home-help {
  border-top: none;
  padding-top: clamp(28px, 4vw, 48px);
}
.page-home .home-help::after {
  display: none;
}
.page-home .home-help__inner {
  display: grid;
  gap: 28px;
  padding: clamp(28px, 4vw, 48px);
  border-radius: var(--radius-l);
  background: linear-gradient(150deg, var(--indigo-700) 0%, var(--ink-900) 100%);
  box-shadow: var(--shadow-m);
}
.page-home .home-help__inner .eyebrow {
  color: var(--copper-400);
}
.page-home .home-help__inner .section-title {
  color: var(--paper-50);
  margin-bottom: 14px;
}
.page-home .home-help__inner .prose {
  color: rgba(247, 245, 240, .82);
}
.page-home .home-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

/* ——— 滚动显现 ——— */
.page-home .reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .42s var(--ease), transform .42s var(--ease);
}
.page-home .reveal.is-in {
  opacity: 1;
  transform: none;
}

/* ——— 断点 ——— */
@media (min-width: 640px) {
  .page-home .home-hero__preview {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-home .path-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 768px) {
  .page-home .home-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }
  .page-home .home-help__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
    align-items: center;
  }
  .page-home .home-help__actions {
    flex-direction: column;
    align-items: stretch;
  }
  .page-home .home-help__actions .btn {
    text-align: center;
  }
}

@media (min-width: 1024px) {
  .page-home .home-shell {
    grid-template-columns: 240px minmax(0, 1fr);
    column-gap: clamp(32px, 4vw, 72px);
  }
  .page-home .home-rail {
    position: sticky;
    top: 104px;
    align-self: start;
    flex-direction: column;
    gap: 18px;
    overflow: visible;
    max-height: calc(100vh - 140px);
    padding: 40px 24px 40px 0;
    border-bottom: none;
    border-right: 1px solid var(--hairline);
  }
  .page-home .home-rail .rail__label {
    display: block;
    margin: 0;
    font-family: var(--font-mono);
    font-size: var(--fs-12);
    letter-spacing: .12em;
    color: var(--slate-400);
  }
  .page-home .home-rail .rail__list {
    flex-direction: column;
    gap: 4px;
    width: 100%;
  }
  .page-home .home-rail .rail-link {
    width: 100%;
    padding: 10px 12px 10px 14px;
    border: none;
    border-radius: 0;
    border-left: 2px solid transparent;
    background: transparent;
    font-size: var(--fs-14);
    white-space: normal;
    transition: border-color .3s var(--ease), color .3s var(--ease), background-color .3s var(--ease);
  }
  .page-home .home-rail .rail-link:hover {
    background: var(--indigo-100);
  }
  .page-home .home-rail .rail-link.is-active {
    background: transparent;
    border-left: 6px solid var(--copper-400);
    color: var(--ink-900);
  }
  .page-home .home-rail .rail-link.is-active .rail-link__code {
    color: var(--copper-600);
  }
  .page-home .home-hero {
    padding-top: clamp(28px, 3vw, 44px);
  }
  .page-home .home-split--7-5 {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
  .page-home .home-split--5-7 {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
  .page-home .code-split__item {
    grid-template-columns: 84px minmax(0, 1fr);
  }
}

@media (min-width: 1280px) {
  .page-home .home-hero__preview {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-home .home-hero__preview > :nth-child(2),
  .page-home .home-hero__preview > :nth-child(4) {
    margin-top: 26px;
  }
  .page-home .home-hero h1 {
    max-width: 15ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-home .reveal {
    opacity: 1;
    transform: none;
    transition: opacity .12s linear;
  }
  .page-home .preview-card,
  .page-home .path-card,
  .page-home .home-rail .rail-link {
    transition: opacity .12s linear;
  }
  .page-home .preview-card:hover,
  .page-home .path-card:hover,
  .page-home .preview-card:focus-visible,
  .page-home .path-card:focus-visible {
    transform: none;
  }
}