.page-home {
  display: block;
  background: var(--ink);
  color: var(--white);
  padding-bottom: clamp(64px, 9vw, 132px);
}

.page-home a {
  color: inherit;
}

/* ---------- 顶部横向章节索引（窄屏） ---------- */
.page-home .index-rail {
  position: sticky;
  top: var(--header-h);
  z-index: 4;
  padding: 9px var(--pad);
  background: rgba(11, 16, 48, .95);
  border-bottom: 1px solid var(--rail);
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-home .rail-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  white-space: nowrap;
}

.page-home .rail-link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding-bottom: 3px;
  border-bottom: 2px solid transparent;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--silver);
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-home .rail-link[aria-current="true"] {
  color: var(--white);
  border-bottom-color: var(--violet);
}

.page-home .rail-no {
  color: var(--violet);
}

.page-home .index-shell {
  max-width: var(--wrap);
  margin: 0 auto;
  padding-inline: var(--pad);
}

/* ---------- 首屏框景 ---------- */
.page-home .hero {
  padding-top: clamp(104px, 13vw, 158px);
  padding-bottom: clamp(40px, 5vw, 72px);
}

.page-home .hero-frame {
  position: relative;
  padding: clamp(18px, 2.4vw, 34px);
  border: 1px solid var(--rail);
  background:
    linear-gradient(180deg, rgba(22, 30, 69, .6), rgba(11, 16, 48, 0) 62%);
}

.page-home .hero-frame::before,
.page-home .hero-frame::after {
  content: "";
  position: absolute;
  left: -1px;
  right: -1px;
  height: 7px;
  background: repeating-linear-gradient(90deg, var(--rail) 0 1px, transparent 1px 26px);
}

.page-home .hero-frame::before {
  top: -8px;
}

.page-home .hero-frame::after {
  bottom: -8px;
}

.page-home .frame-mark {
  position: absolute;
  width: 13px;
  height: 13px;
  border: 2px solid var(--violet);
}

.page-home .frame-mark--tl {
  top: -2px;
  left: -2px;
  border-right: 0;
  border-bottom: 0;
}

.page-home .frame-mark--tr {
  top: -2px;
  right: -2px;
  border-left: 0;
  border-bottom: 0;
}

.page-home .frame-mark--bl {
  bottom: -2px;
  left: -2px;
  border-right: 0;
  border-top: 0;
}

.page-home .frame-mark--br {
  bottom: -2px;
  right: -2px;
  border-left: 0;
  border-top: 0;
}

.page-home .hero-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  justify-content: space-between;
  padding-bottom: 14px;
  margin-bottom: clamp(22px, 3vw, 40px);
  border-bottom: 1px solid var(--rail);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--silver);
}

.page-home .hero-body {
  display: grid;
  gap: clamp(28px, 3.4vw, 48px);
  align-items: end;
}

.page-home .hero-copy {
  min-width: 0;
}

.page-home .eyebrow {
  margin: 0;
}

.page-home .hero-title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 5.4vw, 74px);
  line-height: .98;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-home .hero-lede {
  margin: 20px 0 0;
  max-width: 54ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.78;
  color: var(--silver);
}

.page-home .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-home .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(30px, 4vw, 48px) 0 0;
  background: var(--rail);
  border: 1px solid var(--rail);
}

.page-home .hero-stat {
  background: var(--ink);
  padding: 16px 18px 18px;
}

.page-home .hero-stat dt {
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--silver);
}

.page-home .hero-stat dd {
  margin: 8px 0 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
  color: var(--white);
}

.page-home .stat-num {
  font-size: clamp(24px, 2.6vw, 34px);
  line-height: 1;
  color: var(--violet);
}

.page-home .stat-unit {
  font-size: 12px;
  color: var(--silver);
}

.page-home .hero-media {
  margin: 0;
  border: 1px solid var(--rail);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
  background: var(--panel);
}

.page-home .hero-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(.72) contrast(1.06) brightness(.9);
}

/* ---------- 章节通用 ---------- */
.page-home .section {
  padding-block: clamp(52px, 6.6vw, 100px);
}

.page-home .sec-head {
  display: grid;
  gap: 14px;
  padding-top: 22px;
  margin-bottom: clamp(28px, 3.6vw, 52px);
  border-top: 1px solid var(--rail);
}

.page-home .section-no {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.2vw, 44px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--violet);
}

.page-home .section-title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 3.4vw, 50px);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-home .section-lede {
  margin: 14px 0 0;
  max-width: 64ch;
  font-family: var(--font-serif);
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.72;
  color: var(--silver);
}

/* ---------- 01 三条业务线 ---------- */
.page-home .line-cards {
  display: grid;
  gap: 16px;
}

.page-home .line-card {
  --tone: var(--violet);
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 26px 22px 24px 26px;
  background: var(--panel);
  border: 1px solid var(--rail);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease);
}

.page-home .line-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: var(--tone);
}

.page-home .line-card--warranty {
  --tone: var(--amber);
}

.page-home .line-card--logistics {
  --tone: var(--cyan);
}

.page-home .line-card--terms {
  --tone: var(--violet);
}

.page-home .line-card:hover {
  transform: translate(-4px, -4px);
  box-shadow: var(--shadow-hard);
}

.page-home .line-kicker {
  font-size: 10px;
  letter-spacing: .12em;
  color: var(--tone);
}

.page-home .line-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 2.2vw, 28px);
  letter-spacing: -.01em;
  color: var(--white);
}

.page-home .line-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--silver);
}

.page-home .line-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-home .line-link {
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--rail);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--violet);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.page-home .line-link::after {
  content: " \2192";
}

.page-home .line-link:hover {
  color: var(--cyan);
}

/* ---------- 02 型号检索台 ---------- */
.page-home .catalog {
  display: grid;
  gap: 24px;
}

.page-home .catalog-media {
  margin: 0;
}

.page-home .catalog-media img,
.page-home .dual-media img,
.page-home .warranty-aside img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.72) contrast(1.06) brightness(.92);
}

.page-home .cat-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--rail);
  border: 1px solid var(--rail);
}

.page-home .cat-chip {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 14px 15px;
  background: var(--panel);
  text-decoration: none;
  transition: background .2s var(--ease);
}

.page-home .cat-chip:hover {
  background: var(--rail);
}

.page-home .cat-name {
  font-size: 15px;
  color: var(--white);
}

.page-home .cat-desc {
  font-size: 12px;
  color: var(--silver);
}

.page-home .code-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 8px;
  margin-top: 24px;
  padding: 18px;
  background: var(--ink);
  border: 1px solid var(--rail);
}

.page-home .code-seg {
  flex: 1 1 120px;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 12px 14px;
  border: 1px solid var(--rail);
  background: var(--panel);
}

.page-home .code-seg b {
  font-size: 15px;
  font-weight: 500;
  letter-spacing: .02em;
}

.page-home .code-seg i {
  font-style: normal;
  font-size: 12px;
  color: var(--silver);
}

.page-home .code-seg--a b {
  color: var(--violet);
}

.page-home .code-seg--b b {
  color: var(--cyan);
}

.page-home .code-seg--c b {
  color: var(--celadon);
}

.page-home .code-dash {
  align-self: center;
  width: 16px;
  height: 2px;
  background: var(--rail);
}

.page-home .catalog-note {
  margin: 20px 0 24px;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--silver);
}

/* ---------- 03 质保两档 ---------- */
.page-home .warranty {
  display: grid;
  gap: 24px;
}

.page-home .warranty-aside {
  margin: 0;
}

.page-home .warranty-aside .media-frame {
  margin: 0;
}

.page-home .media-caption {
  margin: 10px 0 0;
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--silver);
}

.page-home .tier-grid {
  display: grid;
  gap: 16px;
}

.page-home .tier {
  --tier-tone: var(--amber);
  position: relative;
  padding: 26px 22px 24px;
  background: var(--panel);
  border: 1px solid var(--rail);
  border-top: 3px solid var(--tier-tone);
}

.page-home .tier--amber {
  --tier-tone: var(--amber);
}

.page-home .tier--celadon {
  --tier-tone: var(--celadon);
}

.page-home .tier-title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 2.2vw, 27px);
  letter-spacing: -.01em;
  color: var(--tier-tone);
}

.page-home .tier-text {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--silver);
}

.page-home .tier-list {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--rail);
}

.page-home .tier-list li {
  padding: 10px 0 10px 14px;
  border-bottom: 1px solid var(--rail);
  font-size: 13px;
  line-height: 1.6;
  color: var(--silver);
  position: relative;
}

.page-home .tier-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 17px;
  width: 5px;
  height: 5px;
  background: var(--tier-tone);
}

.page-home .start-note {
  margin-top: 20px;
  padding: 24px 22px;
  background: var(--ink);
  border: 1px solid var(--rail);
  border-left: 4px solid var(--violet);
}

.page-home .start-title {
  margin: 0 0 12px;
  font-family: var(--font-serif);
  font-size: clamp(18px, 1.8vw, 22px);
  font-weight: 600;
  color: var(--white);
}

.page-home .start-note p {
  margin: 0 0 12px;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--silver);
}

.page-home .start-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

/* ---------- 04 双端同源 ---------- */
.page-home .dual {
  display: grid;
  gap: 28px;
  align-items: center;
}

.page-home .dual-copy p {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--silver);
}

.page-home .dual-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  margin: 24px 0;
  background: var(--rail);
  border: 1px solid var(--rail);
}

.page-home .dual-stats > div {
  background: var(--panel);
  padding: 16px 16px 18px;
}

.page-home .dual-stats dt {
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--silver);
}

.page-home .dual-stats dd {
  margin: 8px 0 0;
  font-size: 17px;
  color: var(--cyan);
}

.page-home .dual-media {
  margin: 0;
  border: 1px solid var(--rail);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

/* ---------- 05 四步路径 ---------- */
.page-home .steps {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--rail);
  border: 1px solid var(--rail);
  counter-reset: step;
}

.page-home .step {
  position: relative;
  background: var(--panel);
  padding: 24px 22px 24px 26px;
}

.page-home .step::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: var(--violet);
  opacity: .35;
  transition: opacity .2s var(--ease);
}

.page-home .step:hover::before {
  opacity: 1;
}

.page-home .step-no {
  display: block;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--violet);
}

.page-home .step-title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2vw, 25px);
  letter-spacing: -.01em;
  color: var(--white);
}

.page-home .step p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--silver);
}

.page-home .steps-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 06 快捷入口 ---------- */
.page-home .entries {
  display: grid;
  gap: 16px;
}

.page-home .entry-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px 22px;
  background: var(--ink);
  border: 1px solid var(--rail);
  text-decoration: none;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
}

.page-home .entry-card:hover {
  transform: translate(-4px, -4px);
  border-color: var(--violet);
  box-shadow: var(--shadow-hard);
}

.page-home .entry-no {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--violet);
}

.page-home .entry-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2vw, 25px);
  letter-spacing: -.01em;
  color: var(--white);
}

.page-home .entry-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--silver);
}

.page-home .entry-go {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-home .entry-go::after {
  content: " \2192";
}

.page-home .entry-card::after {
  content: attr(data-hint);
  position: absolute;
  top: 14px;
  right: 16px;
  max-width: 60%;
  padding: 5px 9px;
  background: var(--panel);
  border: 1px solid var(--rail);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .04em;
  color: var(--silver);
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity .22s var(--ease), transform .22s var(--ease);
  pointer-events: none;
}

.page-home .entry-card:hover::after,
.page-home .entry-card:focus-visible::after {
  opacity: 1;
  transform: translateY(0);
}

.page-home .entry-foot {
  margin: 26px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--rail);
  font-size: 14px;
  line-height: 1.8;
  color: var(--silver);
}

.page-home .entry-foot a {
  color: var(--violet);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-home .entry-foot a:hover {
  color: var(--cyan);
}

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

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

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

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

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

@media (min-width: 900px) {
  .page-home .sec-head {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 30px;
  }

  .page-home .hero-body {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
  }

  .page-home .catalog {
    grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr);
    gap: 34px;
  }

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

  .page-home .warranty {
    grid-template-columns: minmax(0, .58fr) minmax(0, 1.42fr);
    gap: 32px;
  }

  .page-home .dual {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    gap: 40px;
  }
}

@media (min-width: 1180px) {
  .page-home .index-rail {
    position: fixed;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    width: var(--rail-w);
    padding: 0 0 0 14px;
    background: none;
    border-bottom: 0;
    overflow: visible;
    z-index: 3;
  }

  .page-home .rail-nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 3px;
    white-space: normal;
  }

  .page-home .rail-link {
    width: 100%;
    padding: 5px 0 5px 10px;
    border-bottom: 0;
    border-left: 2px solid transparent;
  }

  .page-home .rail-link[aria-current="true"] {
    border-bottom: 0;
    border-left-color: var(--violet);
  }

  .page-home .rail-name {
    font-size: 10px;
  }

  .page-home .index-shell {
    max-width: calc(var(--wrap) + var(--rail-w));
    padding: 0 var(--pad) 0 calc(var(--pad) + var(--rail-w));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-home .line-card,
  .page-home .entry-card,
  .page-home .step::before,
  .page-home .rail-link,
  .page-home .entry-card::after {
    transition: none;
  }

  .page-home .line-card:hover,
  .page-home .entry-card:hover {
    transform: none;
  }
}