.page-home {
  --home-gap: clamp(18px, 2.4vw, 34px);
  --home-rule: rgba(232, 177, 90, .16);
  --home-pad: clamp(52px, 7.5vw, 108px);
  position: relative;
  background: var(--ink);
  color: var(--bone);
  overflow-x: hidden;
  overflow-x: clip;
}

/* ===== 首屏 ===== */
.home-hero {
  position: relative;
  padding: var(--home-pad) 0 clamp(44px, 5.5vw, 80px);
  border-bottom: 1px solid var(--home-rule);
  isolation: isolate;
}

.home-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, rgba(232, 177, 90, .08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(232, 177, 90, .08) 1px, transparent 1px);
  background-size: 92px 92px;
  -webkit-mask-image: radial-gradient(92% 78% at 84% 6%, #000 6%, transparent 74%);
  mask-image: radial-gradient(92% 78% at 84% 6%, #000 6%, transparent 74%);
  pointer-events: none;
}

.home-hero::after {
  content: "";
  position: absolute;
  right: -8%;
  top: 6%;
  width: 48%;
  height: 86%;
  z-index: -1;
  background: linear-gradient(152deg, rgba(110, 82, 168, .34), rgba(82, 199, 219, .10) 48%, transparent 78%);
  clip-path: polygon(26% 0, 100% 0, 74% 100%, 0 100%);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-home .hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 7.4vw, 92px);
  line-height: 1.03;
  letter-spacing: -.022em;
  margin: 14px 0 0;
}

.page-home .hero__title em {
  font-style: normal;
  color: var(--gold);
}

.page-home .hero__lede {
  max-width: 48ch;
  margin-top: 18px;
}

.page-home .hero__actions {
  margin-top: clamp(20px, 2.6vw, 30px);
}

/* 章节索引 */
.hero-index {
  border-top: 1px solid var(--home-rule);
  padding-top: 16px;
}

.hero-index .eyebrow {
  margin: 0 0 12px;
}

.hero-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.hero-index__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 11px 12px 11px 14px;
  border-left: 2px solid var(--line-soft);
  text-decoration: none;
  color: var(--bone);
  transition: border-color .35s ease, background .35s ease, transform .35s ease;
}

.hero-index__link:hover,
.hero-index__link:focus-visible,
.hero-index__link.is-active {
  border-left-color: var(--gold);
  background: linear-gradient(90deg, rgba(232, 177, 90, .12), transparent 72%);
  transform: translateX(2px);
}

.hero-index__no {
  font-size: 13px;
  color: var(--gold);
  letter-spacing: .08em;
}

.hero-index__body {
  display: grid;
  gap: 3px;
}

.hero-index__name {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.35;
}

.hero-index__hint {
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
}

/* 首屏主视觉 */
.hero-visual {
  position: relative;
  margin: clamp(26px, 3.6vw, 48px) 0 0;
  border: 1px solid var(--home-rule);
  background: var(--panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), 0 100%);
}

.hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(10, 12, 17, .74));
  pointer-events: none;
}

.hero-visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

/* ===== 斜切分隔 ===== */
.home-cut {
  height: clamp(26px, 3.2vw, 46px);
  background: linear-gradient(100deg, transparent 10%, rgba(110, 82, 168, .30) 30%, rgba(232, 177, 90, .26) 64%, transparent 92%);
  transform: skewY(-1.2deg);
  pointer-events: none;
}

/* ===== 章节通用 ===== */
.home-open,
.home-rooms,
.home-start,
.home-code,
.home-update {
  position: relative;
  padding: var(--home-pad) 0;
}

.home-rooms::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(to right, rgba(237, 233, 224, .045) 1px, transparent 1px);
  background-size: clamp(64px, 8vw, 118px) 100%;
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 22%, #000 78%, transparent);
  mask-image: linear-gradient(180deg, transparent, #000 22%, #000 78%, transparent);
  pointer-events: none;
}

.home-rooms > .container,
.home-start > .container,
.home-code > .container,
.home-update > .container,
.home-open > .container {
  position: relative;
}

.section-link {
  margin: clamp(26px, 3.4vw, 44px) 0 0;
}

.open-grid {
  margin-top: clamp(26px, 3.4vw, 44px);
}

/* ===== 房间区 ===== */
.home-rooms .filter-bar {
  margin: 0 0 clamp(20px, 3vw, 32px);
  flex-wrap: wrap;
  gap: 8px;
}

.room-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--home-gap);
}

.page-home .room-card {
  position: relative;
  display: grid;
  gap: 12px;
  align-content: start;
  border-radius: 0;
  transition: border-color .6s ease, box-shadow .4s ease, transform .4s ease;
}

.page-home .room-card:hover,
.page-home .room-card:focus-within {
  border-color: rgba(232, 177, 90, .62);
  box-shadow: 0 0 0 1px rgba(232, 177, 90, .14), 0 22px 44px -30px rgba(232, 177, 90, .58);
  transform: translateY(-2px);
}

.room-card .tag {
  justify-self: start;
}

.room-card .card__title {
  margin: 0;
}

.room-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
}

.room-metrics > div {
  display: grid;
  gap: 4px;
}

.room-metrics dt {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}

.room-metrics dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--gold);
  letter-spacing: .02em;
}

.rooms-visual {
  margin-top: clamp(30px, 4vw, 52px);
}

.rooms-visual img {
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 7 / 4;
  object-fit: cover;
}

/* ===== 十二步 ===== */
.start-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  margin-top: clamp(26px, 3.4vw, 44px);
}

.start-visual {
  margin: 0;
}

.start-visual img {
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
}

.rank-ladder {
  list-style: none;
  margin: 0 0 clamp(22px, 3vw, 34px);
  padding: 0;
  display: grid;
  gap: 6px;
}

.rank-ladder li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  align-items: baseline;
  gap: 12px;
  padding: 11px 16px;
  border-left: 3px solid var(--violet);
  background: linear-gradient(90deg, rgba(110, 82, 168, .20), transparent 78%);
}

.rank-ladder li:nth-child(2) { margin-left: 10px; }
.rank-ladder li:nth-child(3) { margin-left: 20px; }
.rank-ladder li:nth-child(4) { margin-left: 30px; border-left-color: var(--cyan-dk); }
.rank-ladder li:nth-child(5) { margin-left: 40px; border-left-color: var(--gold); }

.rank-ladder__no {
  font-size: 12px;
  color: var(--cyan);
  letter-spacing: .08em;
}

.rank-ladder__name {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: .04em;
}

.rank-ladder__count {
  font-size: 20px;
  font-weight: 600;
  color: var(--gold);
}

.rank-ladder__unit {
  font-size: 12px;
  color: var(--muted);
}

.start-steps {
  display: grid;
  gap: 8px;
}

.start-paths .section-link {
  margin-top: clamp(22px, 3vw, 32px);
}

/* ===== 编号 ===== */
.code-grid {
  margin-top: clamp(26px, 3.4vw, 44px);
}

.code-format {
  display: inline-block;
  margin: 0;
  padding: 14px 22px;
  border: 1px solid var(--line-cyan);
  background: linear-gradient(120deg, rgba(82, 199, 219, .12), rgba(232, 177, 90, .08));
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.8vw, 36px);
  font-weight: 600;
  letter-spacing: .2em;
  color: var(--cyan);
}

.code-format__note {
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--muted);
}

.code-list {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 clamp(24px, 3vw, 34px);
  padding: 0;
  display: grid;
  gap: 0;
}

.code-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 15px;
  line-height: 1.75;
  color: var(--bone);
}

.code-list li .mono {
  font-size: 13px;
  font-weight: 600;
  color: var(--cyan);
  letter-spacing: .08em;
}

.code-aside {
  display: grid;
  gap: 16px;
  align-content: start;
}

/* ===== 更新 ===== */
.update-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(26px, 3.4vw, 44px);
}

.update-feature {
  padding: clamp(22px, 3vw, 32px);
  border: 1px solid var(--home-rule);
  border-top: 3px solid var(--gold);
  background: linear-gradient(160deg, rgba(232, 177, 90, .10), transparent 62%), var(--panel);
}

.update-feature__title {
  margin: 8px 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.2vw, 36px);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--bone);
}

.update-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.update-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 14px;
  line-height: 1.7;
  color: var(--bone);
}

.update-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.update-list li .mono {
  font-size: 12px;
  font-weight: 600;
  color: var(--gold);
  letter-spacing: .06em;
}

.update-side {
  display: grid;
  gap: 16px;
  align-content: start;
}

.update-side__text {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--violet);
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.update-visual {
  margin: clamp(30px, 4vw, 52px) 0 0;
}

.update-visual img {
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 25 / 11;
  object-fit: cover;
}

/* ===== 数据条 ===== */
.stat-strip {
  margin-top: clamp(30px, 4vw, 52px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.stat-strip__item {
  background: var(--ink);
  padding: clamp(18px, 2.4vw, 26px) clamp(18px, 2.4vw, 26px);
  display: grid;
  gap: 8px;
  align-content: start;
}

.stat-strip__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.6vw, 42px);
  font-weight: 600;
  line-height: 1;
  color: var(--gold);
  letter-spacing: .02em;
}

.stat-strip__label {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.home-tail {
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.home-tail a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}

.home-tail a:hover,
.home-tail a:focus-visible {
  color: var(--gold-lt);
}

/* ===== 响应式 ===== */
@media (min-width: 620px) {
  .room-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .hero-grid {
    grid-template-columns: minmax(190px, .66fr) minmax(0, 1.5fr);
    gap: clamp(30px, 4.5vw, 72px);
  }

  .start-grid {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    align-items: start;
  }

  .update-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: start;
  }

  .stat-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .room-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .code-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, .85fr);
    gap: clamp(30px, 4vw, 60px);
    align-items: start;
  }
}

@media (max-width: 560px) {
  .rank-ladder li:nth-child(2),
  .rank-ladder li:nth-child(3),
  .rank-ladder li:nth-child(4),
  .rank-ladder li:nth-child(5) {
    margin-left: 0;
  }

  .room-metrics {
    grid-template-columns: minmax(0, 1fr);
  }

  .code-format {
    letter-spacing: .12em;
    padding: 12px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero-index__link,
  .page-home .room-card {
    transition: none;
  }
}