/* ===== 页面：首页总览 ===== */
.page-home {
  --ph-pad: clamp(20px, 3vw, 30px);
  background: var(--c-cream);
  color: var(--c-stone);
  font-family: var(--font-body);
  font-size: var(--fs-17);
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}

.page-home *,
.page-home *::before,
.page-home *::after {
  box-sizing: border-box;
}

.page-home h1,
.page-home h2,
.page-home h3 {
  font-family: var(--font-display);
  color: var(--c-ink);
  line-height: 1.24;
  margin: 0;
}

.page-home a:focus-visible {
  outline: 3px solid var(--c-gold);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 首屏 ---------- */
.page-home .ph-hero {
  position: relative;
}

.page-home .ph-hero__band {
  margin: 0;
  overflow: hidden;
  border-radius: 0 0 28px 8px;
  background: var(--c-sand);
}

.page-home .ph-hero__band img {
  display: block;
  width: 100%;
  height: clamp(170px, 32vh, 330px);
  object-fit: cover;
  object-position: center 42%;
}

.page-home .ph-hero__inner {
  padding-top: clamp(22px, 3.6vw, 40px);
  padding-bottom: clamp(28px, 5vw, 56px);
}

.page-home .ph-context {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(18px, 3vw, 30px);
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .16em;
  color: var(--c-moss);
  font-variant-numeric: tabular-nums;
}

.page-home .ph-context__no {
  color: var(--c-clay);
  font-weight: 700;
}

.page-home .ph-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 34px);
}

.page-home .ph-legend {
  border: 2px solid var(--line);
  border-radius: var(--r-a);
  background: var(--c-sand);
  padding: clamp(16px, 2.4vw, 24px);
}

.page-home .ph-legend__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .16em;
  color: var(--c-mist);
}

.page-home .ph-legend__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-home .ph-legend__item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px dashed var(--line);
}

.page-home .ph-legend__item:last-child {
  border-bottom: 0;
}

.page-home .ph-legend__n {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-28);
  line-height: 1.1;
  color: var(--c-grass);
  font-variant-numeric: tabular-nums;
}

.page-home .ph-legend__t {
  font-size: var(--fs-14);
  color: var(--c-stone);
}

.page-home .ph-title {
  font-weight: 900;
  font-size: clamp(30px, 5.2vw, 56px);
  letter-spacing: -0.005em;
  margin-bottom: clamp(14px, 2vw, 22px);
}

.page-home .ph-lede {
  margin: 0;
  max-width: 48ch;
  font-size: clamp(17px, 1.35vw, 19px);
  color: var(--c-stone);
}

/* 坐标条 */
.page-home .ph-axis {
  margin-top: clamp(30px, 5vw, 56px);
}

.page-home .ph-axis__cap {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .16em;
  color: var(--c-mist);
}

.page-home .ph-axis__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(10px, 2vw, 26px);
}

.page-home .ph-axis__item {
  position: relative;
  padding-top: 26px;
  border-top: 1px solid var(--line);
  transition: border-color .18s var(--ease);
}

.page-home .ph-axis__item::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 0;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-gold);
  transform-origin: 50% 50%;
  transition: transform .18s var(--ease);
}

.page-home .ph-axis__item:hover::before,
.page-home .ph-axis__item:focus-within::before {
  transform: scale(1.2);
}

.page-home .ph-axis__item:hover {
  border-color: var(--c-gold);
}

.page-home .ph-axis__no {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: .08em;
  color: var(--c-clay);
  font-variant-numeric: tabular-nums;
}

.page-home .ph-axis__name {
  display: block;
  margin-top: 2px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(18px, 1.7vw, 22px);
  line-height: 1.35;
  color: var(--c-ink);
}

.page-home .ph-axis__desc {
  display: block;
  font-size: var(--fs-14);
  color: var(--c-moss);
}

/* ---------- 通用小标题 ---------- */
.page-home .ph-kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .18em;
  color: var(--c-clay);
}

.page-home .ph-head {
  max-width: 62ch;
}

.page-home .ph-head h2 {
  font-weight: 600;
  font-size: clamp(26px, 3.4vw, 40px);
}

.page-home .ph-head__sub {
  margin: 14px 0 0;
  color: var(--c-stone);
}

/* ---------- 三大板块索引 ---------- */
.page-home .ph-sections {
  padding: clamp(40px, 7vw, 88px) 0 clamp(34px, 5vw, 64px);
}

.page-home .ph-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 30px);
  margin-top: clamp(26px, 4vw, 46px);
}

.page-home .ph-card {
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: var(--ph-pad);
  padding-top: clamp(30px, 4vw, 42px);
  border: 2px solid var(--line);
  border-radius: var(--r-c);
  background: var(--c-sand);
  transition: transform .18s var(--ease), border-color .18s var(--ease), box-shadow .18s var(--ease);
}

.page-home .ph-card:hover,
.page-home .ph-card:focus-within {
  transform: translateY(-2px);
  border-color: var(--c-gold);
  box-shadow: var(--shadow-lift);
}

.page-home .ph-card__no {
  position: absolute;
  top: -0.16em;
  right: 8px;
  z-index: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(64px, 10vw, 112px);
  line-height: 1;
  color: rgba(201, 138, 46, 0.24);
  pointer-events: none;
  user-select: none;
  font-variant-numeric: tabular-nums;
}

.page-home .ph-card__title {
  position: relative;
  z-index: 1;
  padding-right: clamp(48px, 7vw, 96px);
  font-weight: 600;
  font-size: clamp(22px, 2.4vw, 30px);
}

.page-home .ph-card__fig {
  position: relative;
  z-index: 1;
  margin: clamp(14px, 2vw, 20px) 0;
  overflow: hidden;
  border: 2px solid var(--line);
  border-radius: 14px 4px 14px 4px;
}

.page-home .ph-card__fig img {
  display: block;
  width: 100%;
  height: clamp(96px, 13vw, 140px);
  object-fit: cover;
}

.page-home .ph-card__desc {
  position: relative;
  z-index: 1;
  margin: 0 0 16px;
}

.page-home .ph-card__list {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0 0 clamp(18px, 2.6vw, 24px);
  padding: 0;
}

.page-home .ph-card__list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 8px;
  font-size: var(--fs-17);
  line-height: 1.75;
}

.page-home .ph-card__list li::before {
  content: "";
  position: absolute;
  left: 1px;
  top: .82em;
  width: 7px;
  height: 7px;
  background: var(--c-gold);
  transform: translateY(-50%) rotate(45deg);
}

.page-home .ph-card__link {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  align-self: flex-start;
  margin-top: auto;
  padding: 10px 20px;
  border: 2px solid var(--c-gold);
  border-radius: var(--r-b);
  background: transparent;
  color: var(--c-grass);
  font-size: var(--fs-14);
  font-weight: 700;
  text-decoration: none;
  transition: background-color .18s var(--ease), color .18s var(--ease), transform .18s var(--ease);
}

.page-home .ph-card__link::after {
  content: "→";
  font-family: var(--font-mono);
}

.page-home .ph-card__link:hover {
  background: var(--c-gold);
  color: var(--c-grass);
  transform: translateY(-2px);
}

/* ---------- 更新存档 ---------- */
.page-home .ph-updates {
  background: var(--c-grass);
  color: var(--t-on-dark);
  padding: clamp(40px, 6vw, 80px) 0;
}

.page-home .ph-updates h2 {
  color: var(--c-cream);
  font-weight: 600;
  font-size: clamp(24px, 3vw, 36px);
}

.page-home .ph-updates .ph-kicker {
  color: var(--c-gold-soft);
}

.page-home .ph-updates__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
}

.page-home .ph-updates__text {
  margin: 16px 0 22px;
  color: var(--t-on-dark);
  max-width: 46ch;
}

.page-home .ph-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: var(--r-b);
  background: var(--c-gold);
  color: var(--c-grass);
  font-size: var(--fs-14);
  font-weight: 700;
  text-decoration: none;
  transition: transform .18s var(--ease), background-color .18s var(--ease);
}

.page-home .ph-link::after {
  content: "→";
  font-family: var(--font-mono);
}

.page-home .ph-link:hover {
  transform: translateY(-2px);
  background: var(--c-gold-soft);
}

.page-home .ph-updates__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-dark);
}

.page-home .ph-updates__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line-dark);
  transition: border-color .18s var(--ease);
}

.page-home .ph-updates__item:hover {
  border-color: var(--c-gold);
}

.page-home .ph-updates__tag {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .12em;
  color: var(--c-gold-soft);
}

.page-home .ph-updates__item p {
  margin: 0;
  color: var(--c-cream);
}

/* ---------- 常用路线 ---------- */
.page-home .ph-routes {
  padding: clamp(44px, 7vw, 92px) 0 clamp(34px, 5vw, 64px);
}

.page-home .ph-routes__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
  margin-top: clamp(26px, 4vw, 46px);
}

.page-home .ph-routes__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2vw, 20px);
}

.page-home .ph-route {
  position: relative;
  padding: clamp(18px, 2.6vw, 26px) clamp(18px, 2.6vw, 28px) clamp(18px, 2.6vw, 26px) clamp(60px, 6vw, 78px);
  border: 1px dashed var(--c-mist);
  border-radius: 4px 20px 20px 20px;
  background: var(--c-cream);
  transition: border-color .18s var(--ease);
}

.page-home .ph-route:hover {
  border-color: var(--c-gold);
}

.page-home .ph-route__badge {
  position: absolute;
  left: clamp(16px, 2.2vw, 22px);
  top: clamp(20px, 2.6vw, 26px);
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--c-gold);
  color: var(--c-grass);
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  font-weight: 700;
  line-height: 1;
}

.page-home .ph-route__title {
  font-weight: 600;
  font-size: clamp(19px, 1.8vw, 24px);
  margin-bottom: 8px;
}

.page-home .ph-route__text {
  margin: 0 0 10px;
  font-size: var(--fs-17);
}

.page-home .ph-route__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: .06em;
  color: var(--c-clay);
  font-variant-numeric: tabular-nums;
}

.page-home .ph-routes__fig {
  margin: 0;
  overflow: hidden;
  border: 2px solid var(--line);
  border-radius: 24px 8px 24px 8px;
}

.page-home .ph-routes__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* ---------- 联系 ---------- */
.page-home .ph-help {
  padding: 0 0 clamp(48px, 7vw, 96px);
}

.page-home .ph-help__panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  padding: clamp(24px, 4vw, 44px);
  border: 2px solid var(--line);
  border-radius: 26px 10px 26px 10px;
  background: var(--c-sand);
}

.page-home .ph-help h2 {
  font-weight: 600;
  font-size: clamp(24px, 3vw, 36px);
  margin-bottom: 16px;
}

.page-home .ph-help__mail {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: clamp(17px, 2.1vw, 24px);
  letter-spacing: .01em;
  color: var(--c-grass);
  overflow-wrap: anywhere;
}

.page-home .ph-help__note {
  margin: 0;
  font-size: var(--fs-17);
  color: var(--c-stone);
  max-width: 46ch;
}

.page-home .ph-help__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  align-self: start;
}

.page-home .ph-help__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px 16px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
  transition: border-color .18s var(--ease);
}

.page-home .ph-help__item:hover {
  border-color: var(--c-gold);
}

.page-home .ph-help__k {
  font-size: var(--fs-17);
  color: var(--c-stone);
  min-width: 0;
}

.page-home .ph-help__a {
  font-size: var(--fs-14);
  font-weight: 700;
  color: var(--c-moss);
  text-decoration: none;
  border-bottom: 2px solid var(--c-gold-soft);
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-home .ph-help__a:hover {
  color: var(--c-grass);
  border-color: var(--c-gold);
}

/* ---------- 响应式 ---------- */
@media (min-width: 780px) {
  .page-home .ph-cards {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    align-items: start;
  }

  .page-home .ph-card--a {
    grid-column: 1 / span 7;
  }

  .page-home .ph-card--b {
    grid-column: 8 / span 5;
    margin-top: clamp(26px, 5vw, 74px);
  }

  .page-home .ph-card--c {
    grid-column: 4 / span 9;
    margin-top: clamp(10px, 3vw, 34px);
  }

  .page-home .ph-updates__item {
    grid-template-columns: 15ch minmax(0, 1fr);
    gap: 6px 18px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-home .ph-hero__grid {
    grid-template-columns: 4fr 7fr;
    gap: clamp(30px, 5vw, 72px);
    align-items: start;
  }

  .page-home .ph-legend {
    position: sticky;
    top: 132px;
    align-self: start;
  }

  .page-home .ph-updates__grid {
    grid-template-columns: 5fr 7fr;
    gap: clamp(34px, 5vw, 72px);
  }
}

@media (min-width: 960px) {
  .page-home .ph-routes__grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: clamp(36px, 5vw, 72px);
  }

  .page-home .ph-help__panel {
    grid-template-columns: 6fr 5fr;
    gap: clamp(32px, 5vw, 64px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-home .ph-card,
  .page-home .ph-card__link,
  .page-home .ph-link,
  .page-home .ph-axis__item::before {
    transition: border-color .18s var(--ease), background-color .18s var(--ease), color .18s var(--ease);
  }

  .page-home .ph-card:hover,
  .page-home .ph-card:focus-within,
  .page-home .ph-card__link:hover,
  .page-home .ph-link:hover {
    transform: none;
  }

  .page-home .ph-axis__item:hover::before,
  .page-home .ph-axis__item:focus-within::before {
    transform: none;
  }
}