.page-home {
  --ph-deep: var(--deep-blue);
  --ph-ink: var(--ink-black);
  --ph-blue: var(--brand-blue);
  --ph-red: var(--blood-red);
  --ph-gold: var(--gold-amber);
  --ph-white: var(--snow-white);
  --ph-slate: var(--slate-gray);
  position: relative;
  overflow-x: hidden;
  background: var(--ph-white);
  color: var(--ph-ink);
}

.page-home img {
  max-width: 100%;
  height: auto;
}

/* 全局蓝图网格基底 */
.page-home::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 56px 56px;
}

.page-home .container {
  position: relative;
  z-index: 1;
}

/* ===== 区块编号徽标 ===== */
.ph-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0;
  padding: 4px 10px 4px 4px;
  border: 2px solid var(--ph-ink);
  background: var(--ph-white);
  color: var(--ph-ink);
  font-size: var(--fs-label);
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--sp-sm);
}

.ph-eyebrow__num {
  display: inline-block;
  background: var(--ph-blue);
  color: var(--ph-white);
  padding: 4px 8px;
  margin-right: 8px;
  font-size: 10px;
  letter-spacing: normal;
}

/* ===== 区块标题组 ===== */
.ph-section__head {
  max-width: 780px;
  margin-bottom: var(--sp-xl);
  padding-left: var(--sp-lg);
  border-left: 6px solid var(--ph-blue);
}

.ph-section__head h2 {
  margin: var(--sp-sm) 0;
  font-size: var(--fs-h2);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.ph-section__head p {
  color: var(--ph-slate);
  line-height: 1.8;
  margin: 0;
}

.page-home h1,
.page-home h2,
.page-home h3 {
  font-family: var(--font-heading);
}

/* ===== 首屏 HERO ===== */
.ph-hero {
  position: relative;
  padding: var(--sp-xl) 0 var(--sp-2xl);
  border-bottom: var(--border-w) solid var(--ph-ink);
  overflow: hidden;
}

.ph-hero__container {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-xl);
}

.ph-hero__copy {
  position: relative;
  z-index: 1;
}

.ph-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-sm);
  padding: 6px 14px;
  margin-top: var(--sp-lg);
  border: 1px solid var(--ph-ink);
  border-left: 6px solid var(--ph-blue);
  background: var(--ph-white);
  font-size: var(--fs-label);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ph-slate);
}

.ph-hero h1 {
  font-size: var(--fs-display);
  line-height: 1.12;
  letter-spacing: -0.03em;
  margin: var(--sp-lg) 0 var(--sp-md);
}

.ph-hero__lead {
  font-size: var(--fs-body);
  color: var(--ph-slate);
  line-height: 1.85;
  max-width: 36em;
  margin: 0;
}

.ph-hero__lead strong {
  color: var(--ph-ink);
}

.ph-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-md);
  margin-top: var(--sp-lg);
}

.ph-hero .btn-ghost {
  border-color: var(--ph-ink);
  color: var(--ph-ink);
}

.ph-hero .btn-ghost:hover,
.ph-hero .btn-ghost:focus-visible {
  background: var(--ph-ink);
  color: var(--ph-white);
}

.ph-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-md);
  margin-top: var(--sp-lg);
}

.ph-hero__meta span {
  font-size: var(--fs-label);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ph-ink);
  padding-bottom: 4px;
  border-bottom: 3px solid var(--ph-gold);
}

.ph-hero__art {
  position: relative;
  min-height: 260px;
}

.ph-hero__blue {
  position: absolute;
  z-index: 0;
  top: 4%;
  right: -8%;
  bottom: -4%;
  left: 10%;
  background: var(--ph-blue);
  clip-path: polygon(0 0, 100% 8%, 100% 100%, 4% 88%);
}

.ph-hero__img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
  filter: saturate(1.05) contrast(1.02);
}

.ph-hero__chip {
  position: absolute;
  z-index: 2;
  left: 0;
  bottom: 8%;
  background: var(--ph-deep);
  border-left: 6px solid var(--ph-gold);
  color: var(--ph-white);
  padding: var(--sp-md) var(--sp-lg);
  box-shadow: var(--shadow-hard);
  max-width: 80%;
}

.ph-hero__chip strong {
  display: block;
  font-size: var(--fs-small);
  letter-spacing: 0.06em;
  margin-bottom: 2px;
}

.ph-hero__chip span {
  display: block;
  font-size: var(--fs-label);
  color: rgba(247, 249, 252, 0.72);
}

/* 页内锚点导航 */
.ph-anchor-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-xs);
  margin-top: var(--sp-2xl);
  padding-top: var(--sp-md);
  border-top: 1px solid rgba(20, 24, 29, 0.25);
}

.ph-anchor-nav a {
  font-size: var(--fs-small);
  font-weight: 700;
  color: var(--ph-slate);
  text-decoration: none;
  padding: 6px 12px;
  border: 1px solid transparent;
  transition: color var(--t-fast), background var(--t-fast), border-color var(--t-fast);
}

.ph-anchor-nav a:hover,
.ph-anchor-nav a:focus-visible {
  color: var(--ph-ink);
  border-color: var(--ph-ink);
}

.ph-anchor-nav a.is-active {
  color: var(--ph-white);
  background: var(--ph-blue);
  border-color: var(--ph-blue);
}

/* ===== 迁移公告 ===== */
.ph-migration {
  position: relative;
  padding: var(--sp-2xl) 0;
  border-bottom: var(--border-w) solid var(--ph-ink);
  background: var(--ph-white);
}

.ph-migration__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-xl);
}

.ph-migration__map {
  border: var(--border-w) solid var(--ph-ink);
  background: var(--ph-white);
  box-shadow: var(--shadow-hard);
  padding: var(--sp-md);
  align-self: start;
}

.ph-migration__svg {
  display: block;
  width: 100%;
  height: auto;
}

.ph-guide-card {
  position: relative;
  border: var(--border-w) solid var(--ph-ink);
  background: var(--ph-white);
  padding: var(--sp-lg);
  margin-bottom: var(--sp-lg);
  box-shadow: 4px 4px 0 rgba(20, 24, 29, 0.15);
  transition: transform var(--t-fast), box-shadow var(--t-fast);
}

.ph-guide-card:last-child {
  margin-bottom: 0;
}

.ph-guide-card:hover,
.ph-guide-card:focus-within {
  transform: translateY(-3px);
  box-shadow: var(--shadow-blue);
}

.ph-guide-card__num {
  position: absolute;
  top: -14px;
  right: -8px;
  background: var(--ph-ink);
  color: var(--ph-white);
  font-weight: 900;
  font-size: var(--fs-label);
  padding: 3px 10px;
}

.ph-guide-card h3 {
  font-size: var(--fs-h3);
  margin: 0 0 var(--sp-xs);
}

.ph-guide-card p {
  color: var(--ph-slate);
  line-height: 1.8;
  font-size: var(--fs-small);
  margin: 0;
}

.ph-migration__bottom {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: var(--sp-lg);
  margin-top: var(--sp-2xl);
  padding: var(--sp-lg);
  border: 2px dashed rgba(30, 136, 229, 0.8);
  background: rgba(30, 136, 229, 0.05);
}

.ph-migration__bottom img {
  width: 140px;
  max-width: 140px;
  display: block;
  border: var(--border-w) solid var(--ph-ink);
  box-shadow: 3px 3px 0 var(--ph-ink);
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.ph-migration__bottom h3 {
  font-size: var(--fs-h4);
  margin: 0 0 var(--sp-xs);
  font-weight: 900;
}

.ph-migration__bottom p {
  margin: 0 0 var(--sp-sm);
  color: var(--ph-slate);
  line-height: 1.8;
  font-size: var(--fs-small);
  max-width: 48em;
}

.ph-migration__bottom a {
  color: var(--ph-blue);
  font-weight: 700;
  font-size: var(--fs-small);
  text-decoration: none;
  border-bottom: 2px solid var(--ph-blue);
  padding-bottom: 2px;
}

.ph-migration__bottom a:hover,
.ph-migration__bottom a:focus-visible {
  color: var(--ph-ink);
  border-color: var(--ph-ink);
}

.ph-jump {
  display: inline-block;
  color: var(--ph-blue);
  font-weight: 700;
  font-size: var(--fs-small);
  text-decoration: none;
  border-bottom: 2px solid var(--ph-blue);
  padding-bottom: 2px;
  transition: color var(--t-fast), border-color var(--t-fast);
}

.ph-jump:hover,
.ph-jump:focus-visible {
  color: var(--ph-ink);
  border-color: var(--ph-ink);
}

/* ===== 排查指南 ===== */
.ph-troubleshoot {
  position: relative;
  padding: var(--sp-2xl) 0;
  color: var(--ph-white);
  background: linear-gradient(168deg, var(--ph-deep) 0%, var(--ph-deep) 88%, var(--ph-white) 88%);
  border-bottom: var(--border-w) solid var(--ph-ink);
}

.ph-troubleshoot__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-xl);
}

.ph-troubleshoot__visual h2 {
  color: var(--ph-white);
  margin: var(--sp-sm) 0;
  font-size: var(--fs-h2);
  font-weight: 900;
  letter-spacing: -0.02em;
}

.ph-troubleshoot__lead {
  color: rgba(247, 249, 252, 0.78);
  line-height: 1.85;
  margin: 0 0 var(--sp-lg);
}

.ph-troubleshoot .ph-eyebrow {
  background: var(--ph-white);
  color: var(--ph-ink);
  border-color: var(--ph-white);
}

.ph-troubleshoot__visual img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: var(--border-w) solid var(--ph-white);
  box-shadow: 6px 6px 0 var(--ph-blue);
}

.ph-check {
  margin-bottom: var(--sp-md);
  border: var(--border-w) solid rgba(247, 249, 252, 0.6);
  background: rgba(247, 249, 252, 0.05);
  transition: border-color var(--t-fast), background var(--t-fast), box-shadow var(--t-fast);
}

.ph-check[open] {
  border-color: var(--ph-blue);
  background: rgba(30, 136, 229, 0.12);
  box-shadow: 0 0 0 1px var(--ph-blue);
}

.ph-check summary {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
  padding: var(--sp-sm) var(--sp-md);
  list-style: none;
  cursor: pointer;
  font-weight: 700;
  font-size: var(--fs-small);
  color: var(--ph-white);
  line-height: 1.6;
}

.ph-check summary::-webkit-details-marker {
  display: none;
}

.ph-check summary::after {
  content: "+";
  margin-left: auto;
  font-size: var(--fs-h3);
  line-height: 1;
  color: var(--ph-gold);
  transition: transform var(--t-fast);
}

.ph-check[open] summary::after {
  transform: rotate(45deg);
}

.ph-check__body {
  padding: var(--sp-sm) var(--sp-md) var(--sp-md);
  border-top: 1px solid rgba(247, 249, 252, 0.2);
  margin-top: var(--sp-sm);
  color: rgba(247, 249, 252, 0.82);
  font-size: var(--fs-small);
  line-height: 1.8;
}

.ph-check__body a {
  color: var(--ph-gold);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 179, 0, 0.6);
}

.ph-check:last-child {
  margin-bottom: 0;
}

/* ===== 赛事内容中心 ===== */
.ph-hub {
  position: relative;
  padding: var(--sp-2xl) 0;
  border-bottom: var(--border-w) solid var(--ph-ink);
  background: var(--ph-white);
}

.ph-hub__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-md);
  margin: var(--sp-xl) 0;
}

.ph-stat {
  position: relative;
  border: var(--border-w) solid var(--ph-ink);
  background: var(--ph-white);
  padding: var(--sp-lg);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.ph-stat::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 36px;
  height: 36px;
  border-left: var(--border-w) solid var(--ph-ink);
  border-bottom: var(--border-w) solid var(--ph-ink);
  background: var(--ph-gold);
}

.ph-stat__num {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.1;
}

.ph-stat__label {
  display: block;
  font-size: var(--fs-label);
  color: var(--ph-slate);
  margin-top: var(--sp-xs);
  letter-spacing: 0.08em;
  font-weight: 700;
}

.ph-hub__tools {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-lg);
  margin-bottom: var(--sp-xl);
}

.ph-toolcard {
  position: relative;
  border: var(--border-w) solid var(--ph-ink);
  background: var(--ph-white);
  padding: var(--sp-lg);
  box-shadow: 4px 4px 0 rgba(20, 24, 29, 0.15);
  transition: transform var(--t-fast), box-shadow var(--t-fast), border-color var(--t-fast);
}

.ph-toolcard h3 {
  font-size: var(--fs-h3);
  margin: 0 0 var(--sp-xs);
}

.ph-toolcard p {
  font-size: var(--fs-body);
  color: var(--ph-slate);
  line-height: 1.8;
  margin-bottom: var(--sp-md);
}

.ph-toolcard a {
  color: var(--ph-ink);
  font-weight: 700;
  font-size: var(--fs-small);
  text-decoration: none;
  border-bottom: 3px solid var(--ph-blue);
  padding-bottom: 2px;
  transition: border-color var(--t-fast), color var(--t-fast);
}

.ph-toolcard:hover,
.ph-toolcard:focus-within {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-blue);
  border-color: var(--ph-blue);
}

.ph-toolcard:hover a,
.ph-toolcard:focus-within a {
  border-color: var(--ph-ink);
}

.ph-hub__img {
  display: block;
  width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border: var(--border-w) solid var(--ph-ink);
  box-shadow: var(--shadow-blue);
}

/* ===== 联系入口变更记录 ===== */
.ph-history {
  position: relative;
  padding: var(--sp-2xl) 0;
  border-bottom: var(--border-w) solid var(--ph-ink);
  background: var(--ph-white);
}

.ph-history .ph-section__head p a {
  color: var(--ph-ink);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--ph-blue);
}

.ph-history__timeline {
  margin-top: var(--sp-xl);
  margin-left: var(--sp-sm);
  border-left: 3px solid var(--ph-ink);
}

.ph-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-xs);
  padding: var(--sp-md) 0 var(--sp-md) var(--sp-lg);
  border-bottom: 1px dashed rgba(20, 24, 29, 0.25);
}

.ph-timeline__item:last-child {
  border-bottom: none;
}

.ph-timeline__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 20px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ph-blue);
  border: 3px solid var(--ph-ink);
}

.ph-timeline__ver {
  font-weight: 900;
  font-size: var(--fs-small);
  color: var(--ph-ink);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.ph-timeline__desc {
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--ph-slate);
  margin: 0;
}

.ph-timeline__desc a {
  color: var(--ph-ink);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--ph-blue);
}

/* ===== 收尾 CTA ===== */
.ph-cta {
  position: relative;
  padding: var(--sp-2xl) 0;
  background: var(--ph-deep);
  color: var(--ph-white);
  border-top: var(--border-w) solid var(--ph-ink);
}

.ph-cta__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-lg);
  align-items: center;
}

.ph-cta h2 {
  font-size: var(--fs-h2);
  font-weight: 900;
  letter-spacing: -0.02em;
  margin: 0 0 var(--sp-xs);
}

.ph-cta p {
  font-size: var(--fs-body);
  line-height: 1.8;
  color: rgba(247, 249, 252, 0.9);
  max-width: 34em;
  margin: 0;
}

.ph-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-md);
}

.ph-cta .btn-ghost {
  border-color: var(--ph-white);
  color: var(--ph-white);
}

.ph-cta .btn-ghost:hover,
.ph-cta .btn-ghost:focus-visible {
  background: var(--ph-white);
  color: var(--ph-deep);
}

/* ===== 响应式增强 ===== */
@media (min-width: 640px) {
  .ph-hub__stats {
    grid-template-columns: repeat(3, 1fr);
  }

  .ph-hub__stats .ph-stat:nth-child(2) {
    margin-top: 20px;
  }

  .ph-hub__stats .ph-stat:nth-child(3) {
    margin-top: 8px;
  }

  .ph-hub__tools {
    grid-template-columns: 1fr 1fr;
  }

  .ph-timeline__item {
    grid-template-columns: 180px 1fr;
    gap: var(--sp-xl);
  }
}

@media (min-width: 700px) {
  .ph-migration__bottom {
    flex-direction: row;
    align-items: center;
  }

  .ph-migration__bottom img {
    flex-shrink: 0;
  }

  .ph-cta__inner {
    grid-template-columns: 1fr auto;
    gap: var(--sp-xl);
  }
}

@media (min-width: 900px) {
  .ph-hero__container {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: var(--sp-2xl);
    align-items: center;
  }

  .ph-hero__art {
    margin-right: -12px;
  }

  .ph-migration__grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .ph-troubleshoot__inner {
    grid-template-columns: 0.9fr 1.1fr;
    gap: var(--sp-2xl);
    align-items: start;
  }
}