.page-home {
  --home-line: var(--char-600);
  --home-panel: var(--char-800);
  --home-glow: rgba(228, 88, 30, .18);
  --home-cool: rgba(63, 126, 168, .22);
}

.page-home .section {
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
}

/* ---------- 首屏：对角切分 ---------- */

.page-home .hero {
  position: relative;
  overflow: hidden;
  padding: clamp(2rem, 5vw, 3.5rem) 0 clamp(2.5rem, 6vw, 4.5rem);
  background:
    radial-gradient(120% 90% at 88% 6%, var(--home-glow), transparent 55%),
    linear-gradient(160deg, var(--char-800) 0%, var(--void-black) 58%);
  border-bottom: 1px solid var(--home-line);
}

.page-home .hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(195, 202, 206, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(195, 202, 206, .045) 1px, transparent 1px);
  background-size: 46px 46px;
  pointer-events: none;
}

.page-home .hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 5vw, 3.25rem);
  align-items: start;
}

.page-home .hero__eyebrow {
  margin: 0 0 .75rem;
  font-size: .8125rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ember-300);
}

.page-home .hero__copy .h-display {
  margin: 0 0 1rem;
  max-width: 22ch;
  transform: scaleX(.94);
  transform-origin: left center;
}

.page-home .hero__copy .lede {
  max-width: 34em;
  margin: 0;
  color: var(--frost-400);
}

.page-home .hero__chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 1.35rem 0 0;
  padding: 0;
}

.page-home .chip {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .35rem .8rem;
  font-size: .8125rem;
  color: var(--frost-400);
  background: rgba(42, 40, 37, .72);
  border: 1px solid var(--home-line);
  border-radius: 999px;
  cursor: help;
}

.page-home .chip::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ember-500);
  flex: none;
}

.page-home .chip--key {
  border-color: rgba(247, 183, 51, .55);
}

.page-home .chip--key::before {
  background: var(--amber-400);
}

.page-home .chip--key .chip__label {
  color: var(--amber-400);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.page-home .chip__def {
  display: none;
  position: absolute;
  z-index: 6;
  left: 0;
  top: calc(100% + .55rem);
  width: min(272px, 74vw);
  padding: .65rem .75rem;
  font-size: .75rem;
  line-height: 1.6;
  color: var(--frost-400);
  background: var(--void-black);
  border: 1px solid var(--ember-500);
  border-radius: var(--radius-s);
  box-shadow: 0 16px 34px rgba(0, 0, 0, .55);
}

.page-home .chip:hover .chip__def,
.page-home .chip:focus-visible .chip__def,
.page-home .chip:focus-within .chip__def {
  display: block;
}

.page-home .chip:focus-visible {
  outline: 2px solid var(--ember-500);
  outline-offset: 2px;
}

.page-home .hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  margin-top: 1.75rem;
}

.page-home .hero__panel {
  position: relative;
  padding: clamp(.9rem, 3vw, 1.4rem);
  background: rgba(26, 25, 23, .86);
  border: 1px solid var(--home-line);
  border-radius: var(--radius-l);
  clip-path: polygon(0 5%, 100% 0, 100% 95%, 0 100%);
}

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

.page-home .hero__stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .55rem;
  margin: 1rem 0 0;
  padding: 0;
}

.page-home .hero__stats .metric {
  padding: .6rem .7rem;
  background: rgba(16, 16, 16, .72);
  border: 1px solid var(--home-line);
  border-radius: var(--radius-s);
  display: grid;
  gap: .2rem;
}

.page-home .hero__stats .metric:first-child {
  grid-column: span 2;
  border-left: 3px solid var(--ember-500);
}

.page-home .hero__stats .metric__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.0625rem;
  color: var(--frost-100);
}

.page-home .hero__stats .num--key {
  color: var(--amber-400);
}

.page-home .hero__stats .metric__label {
  font-size: .75rem;
  color: var(--steel-500);
}

/* ---------- 页内索引 ---------- */

.page-home .page-index {
  padding-top: 1.25rem;
  padding-bottom: .25rem;
}

.page-home .page-index__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .4rem .85rem;
  margin: 0;
  padding: .75rem 0;
  border-bottom: 1px solid var(--home-line);
}

.page-home .page-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: .45rem;
  padding: .2rem 0;
  font-size: .875rem;
  color: var(--frost-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-home .page-index__num {
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--ember-300);
}

.page-home .page-index__list a:hover {
  color: var(--frost-100);
  border-bottom-color: var(--ember-500);
}

.page-home .page-index__list a:focus-visible {
  outline: 2px solid var(--ember-500);
  outline-offset: 2px;
}

/* ---------- 01 分层总览 ---------- */

.page-home .section__head {
  max-width: 46rem;
  margin-bottom: clamp(1.5rem, 4vw, 2.25rem);
}

.page-home .section__head .h-sec {
  margin: .35rem 0 .75rem;
}

.page-home .section__head .lede {
  margin: 0 0 .6rem;
  color: var(--frost-400);
}

.page-home .tier-filter {
  position: relative;
}

.page-home .tier-filter__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-home .tier-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin-bottom: 1.25rem;
}

.page-home .tier-tabs__label {
  padding: .4rem .85rem;
  font-size: .8125rem;
  color: var(--frost-400);
  background: rgba(26, 25, 23, .8);
  border: 1px solid var(--home-line);
  border-radius: 999px;
  cursor: pointer;
  transition: color .18s var(--ease), background-color .18s var(--ease), border-color .18s var(--ease);
}

.page-home .tier-tabs__label:hover {
  border-color: var(--ember-500);
  color: var(--frost-100);
}

.page-home #tier-all:checked ~ .tier-tabs label[for="tier-all"],
.page-home #tier-1:checked ~ .tier-tabs label[for="tier-1"],
.page-home #tier-2:checked ~ .tier-tabs label[for="tier-2"],
.page-home #tier-3:checked ~ .tier-tabs label[for="tier-3"],
.page-home #tier-4:checked ~ .tier-tabs label[for="tier-4"] {
  color: var(--void-black);
  background: var(--amber-400);
  border-color: var(--amber-400);
  font-weight: 700;
}

.page-home #tier-all:focus-visible ~ .tier-tabs label[for="tier-all"],
.page-home #tier-1:focus-visible ~ .tier-tabs label[for="tier-1"],
.page-home #tier-2:focus-visible ~ .tier-tabs label[for="tier-2"],
.page-home #tier-3:focus-visible ~ .tier-tabs label[for="tier-3"],
.page-home #tier-4:focus-visible ~ .tier-tabs label[for="tier-4"] {
  outline: 2px solid var(--ember-500);
  outline-offset: 2px;
}

.page-home #tier-1:checked ~ .tier-stage .tier-card:not([data-tier="1"]),
.page-home #tier-2:checked ~ .tier-stage .tier-card:not([data-tier="2"]),
.page-home #tier-3:checked ~ .tier-stage .tier-card:not([data-tier="3"]),
.page-home #tier-4:checked ~ .tier-stage .tier-card:not([data-tier="4"]) {
  display: none;
}

.page-home .tier-stage {
  position: relative;
  border-radius: var(--radius-l);
}

.page-home .tier-stage__texture {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .13;
  border-radius: var(--radius-l);
  pointer-events: none;
}

.page-home .tier-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .9rem;
}

.page-home .tier-card {
  position: relative;
  overflow: hidden;
  padding: 1.1rem 1.15rem 1.25rem;
  background: rgba(26, 25, 23, .92);
  border: 1px solid var(--home-line);
  border-radius: var(--radius-m);
  backdrop-filter: blur(2px);
}

.page-home .tier-card::after {
  content: "";
  position: absolute;
  right: -28%;
  bottom: -58%;
  width: 62%;
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle, var(--home-cool), transparent 68%);
  pointer-events: none;
}

.page-home .tier-card--lead {
  background: linear-gradient(152deg, rgba(228, 88, 30, .2), rgba(26, 25, 23, .94) 58%);
  border-color: rgba(228, 88, 30, .5);
}

.page-home .tier-card--lead::after {
  background: radial-gradient(circle, rgba(247, 183, 51, .2), transparent 68%);
}

.page-home .tier-card .card__title {
  margin: 0 0 .35rem;
  font-size: 1.25rem;
}

.page-home .tier-card .card__meta {
  margin: 0 0 .7rem;
  font-size: .75rem;
  letter-spacing: .04em;
  color: var(--steel-500);
}

.page-home .tier-card__text {
  margin: 0 0 1rem;
  font-size: .9375rem;
  line-height: 1.7;
  color: var(--frost-400);
}

.page-home .tier-card__bar {
  display: block;
  width: 100%;
  height: 24px;
}

.page-home .tier-card__bar .bar-track {
  fill: var(--data-blue-deep);
  opacity: .55;
}

.page-home .tier-card__bar .bar-fill {
  fill: var(--data-blue);
}

.page-home .tier-card--lead .tier-card__bar .bar-fill {
  fill: var(--ember-500);
}

/* ---------- 02 同源核定 ---------- */

.page-home .source-check {
  background: linear-gradient(180deg, var(--void-black), var(--char-800));
  border-top: 1px solid var(--home-line);
  border-bottom: 1px solid var(--home-line);
}

.page-home .source-band {
  position: relative;
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
  border-radius: var(--radius-m);
  overflow: hidden;
  border: 1px solid var(--home-line);
}

.page-home .source-band img {
  display: block;
  width: 100%;
  height: clamp(120px, 22vw, 210px);
  object-fit: cover;
}

.page-home .source-band__caption {
  position: absolute;
  left: .85rem;
  bottom: .6rem;
  margin: 0;
  color: var(--frost-100);
  text-shadow: 0 1px 8px rgba(0, 0, 0, .85);
}

.page-home .split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
}

.page-home .split__aside .h-sec {
  margin: .4rem 0 0;
}

.page-home .split__main.prose p {
  max-width: 34em;
  margin: 0 0 1rem;
  color: var(--frost-400);
}

.page-home .split__main .btn {
  margin-top: .5rem;
}

/* ---------- 03 两条独立线 ---------- */

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

.page-home .side-card {
  position: relative;
  padding: 1.2rem 1.25rem 1.35rem;
}

.page-home .side-card .card__title {
  margin: 0 0 .35rem;
  font-size: 1.125rem;
}

.page-home .side-card .card__meta {
  margin: 0 0 .7rem;
  font-size: .75rem;
  color: var(--steel-500);
  letter-spacing: .04em;
}

.page-home .side-card p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.7;
  color: var(--frost-400);
}

.page-home .card--accent.side-card {
  border-left: 3px solid var(--ember-500);
}

.page-home .side-note {
  grid-column: 1 / -1;
  margin: .25rem 0 0;
  padding-left: .85rem;
  border-left: 2px solid var(--char-600);
  color: var(--steel-500);
}

/* ---------- 04 复盘索引 ---------- */

.page-home .recap {
  padding-top: 0;
}

.page-home .recap-panel {
  padding: clamp(1.35rem, 4vw, 2.5rem);
  background: var(--frost-100);
  color: var(--char-800);
  border-radius: var(--radius-l);
  box-shadow: 0 24px 60px rgba(0, 0, 0, .45);
}

.page-home .recap-panel__head {
  max-width: 44rem;
  margin-bottom: 1.35rem;
}

.page-home .section__index--dark {
  color: #A93F12;
}

.page-home .recap-panel .h-sec--dark {
  color: var(--char-800);
  margin: .35rem 0 .7rem;
}

.page-home .recap-panel__head p {
  margin: 0;
  max-width: 34em;
  color: #3A3733;
}

.page-home .recap-list {
  list-style: none;
  margin: 0 0 1.35rem;
  padding: 0;
  border-top: 1px solid #D4D8DA;
}

.page-home .recap-list__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: .35rem .75rem;
  padding: .8rem .1rem;
  border-bottom: 1px solid #D4D8DA;
}

.page-home .recap-list__series {
  font-weight: 700;
  font-size: 1rem;
  color: var(--char-800);
}

.page-home .recap-list__meta {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .8125rem;
  color: #56514C;
  grid-column: 1;
}

.page-home .recap-list__link {
  grid-row: 1 / span 2;
  grid-column: 2;
  align-self: center;
  font-size: .875rem;
  font-weight: 700;
  color: var(--char-800);
  text-decoration: none;
  border-bottom: 2px solid var(--ember-500);
  padding-bottom: 2px;
}

.page-home .recap-list__link:hover {
  color: #A93F12;
  border-bottom-color: #A93F12;
}

.page-home .recap-list__link:focus-visible {
  outline: 2px solid var(--ember-500);
  outline-offset: 3px;
}

.page-home .recap-panel__foot {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
}

.page-home .btn--dark-text {
  color: var(--char-800);
  border-color: var(--char-800);
}

.page-home .btn--dark-text:hover {
  color: var(--frost-100);
  background: var(--char-800);
}

/* ---------- 05 更新日志 ---------- */

.page-home .log-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.75rem);
  align-items: start;
}

.page-home .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.35rem;
  border-left: 2px solid var(--home-line);
  display: grid;
  gap: 1.6rem;
}

.page-home .timeline__item {
  position: relative;
}

.page-home .timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1.35rem - 6px);
  top: .45rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ember-500);
  box-shadow: 0 0 0 3px rgba(228, 88, 30, .18);
}

.page-home .timeline__item:first-child::before {
  background: var(--amber-400);
  box-shadow: 0 0 0 4px rgba(247, 183, 51, .18);
}

.page-home .timeline__round {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .8125rem;
  letter-spacing: .05em;
  color: var(--amber-400);
  margin-bottom: .3rem;
}

.page-home .timeline__title {
  margin: 0 0 .4rem;
  font-size: 1.0625rem;
  line-height: 1.45;
  color: var(--frost-100);
}

.page-home .timeline__item p {
  margin: 0;
  max-width: 34em;
  font-size: .9375rem;
  line-height: 1.7;
  color: var(--frost-400);
}

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

.page-home .log-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: var(--radius-m);
  border: 1px solid var(--home-line);
}

.page-home .log-media figcaption {
  margin-top: .6rem;
  color: var(--steel-500);
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-home .hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-home .hero__stats .metric:first-child {
    grid-column: span 1;
  }

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

@media (min-width: 1000px) {
  .page-home .hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    align-items: start;
  }

  .page-home .hero__panel {
    margin-top: 1.25rem;
  }

  .page-home .split {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
  }

  .page-home .split__aside {
    position: sticky;
    top: var(--sticky-top);
    align-self: start;
  }

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

  .page-home .tier-card--lead {
    grid-column: span 2;
    grid-row: span 2;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    padding: 1.6rem 1.5rem 1.5rem;
  }

  .page-home .tier-card--lead .tier-card__text {
    font-size: 1rem;
    max-width: 34em;
  }

  .page-home .tier-card--lead .tier-card__bar {
    margin-top: auto;
    height: 32px;
  }

  .page-home .side-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr)) minmax(0, .9fr);
  }

  .page-home .side-note {
    grid-column: 3;
    margin: 0;
  }

  .page-home .log-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
  }
}

@media (min-width: 1200px) {
  .page-home .hero__media img {
    height: clamp(280px, 26vw, 380px);
    object-fit: cover;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-home .tier-tabs__label,
  .page-home .recap-list__link {
    transition: none;
  }
}