.page-home {
  --ph-axis-w: 214px;
  --ph-gap: clamp(20px, 3.5vw, 48px);
  --ph-pad: clamp(48px, 7vw, 96px);
  position: relative;
  color: var(--text);
  background-color: var(--bg);
  overflow-x: clip;
}

.page-home::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: var(--grid-size) var(--grid-size);
  background-position: 0 var(--grid-shift, 0px);
  opacity: 0.28;
  pointer-events: none;
  z-index: 0;
}

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

/* ---------- 章节标题族 ---------- */
.page-home .ph-head {
  max-width: 46em;
  margin-bottom: clamp(26px, 3.4vw, 44px);
}

.page-home .ph-head__idx {
  margin: 0 0 12px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--signal);
}

.page-home .ph-head .h-serif {
  margin: 0 0 14px;
}

.page-home .ph-head__sub {
  margin: 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 首屏 ---------- */
.page-home .hero {
  padding: clamp(36px, 5vw, 72px) 0 clamp(48px, 6vw, 88px);
  border-bottom: 1px solid var(--grid-line);
}

.page-home .hero__wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--ph-gap);
}

@media (min-width: 1000px) {
  .page-home .hero__wrap {
    grid-template-columns: var(--ph-axis-w) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 64px);
  }
}

/* 坐标轴 */
.page-home .page-axis {
  padding-left: 14px;
  border-left: 1px solid var(--grid-line);
}

@media (min-width: 1000px) {
  .page-home .page-axis {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
  }
}

.page-home .page-axis__list {
  list-style: none;
  margin: 14px 0 22px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

@media (min-width: 1000px) {
  .page-home .page-axis__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }
}

.page-home .page-axis__link {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  padding: 7px 10px;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid transparent;
  border-left: 2px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast), background-color var(--t-fast);
}

.page-home .page-axis__link .axis-num {
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--grid);
  transition: color var(--t-fast);
}

.page-home .page-axis__link:hover,
.page-home .page-axis__link[aria-current="true"] {
  color: var(--mist);
  border-left-color: var(--signal);
  background-color: rgba(255, 122, 47, 0.06);
}

.page-home .page-axis__link:hover .axis-num,
.page-home .page-axis__link[aria-current="true"] .axis-num {
  color: var(--signal);
}

.page-home .page-axis__signals {
  padding-top: 16px;
  border-top: 1px dashed var(--grid-line);
  display: grid;
  gap: 9px;
}

.page-home .signal-row {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-home .signal-row b {
  color: var(--mist);
  font-weight: 500;
}

/* 首屏内容 */
.page-home .hero__body {
  display: flex;
  flex-direction: column;
  gap: clamp(24px, 3.2vw, 40px);
  min-width: 0;
}

.page-home .hero__intro {
  max-width: 36em;
}

.page-home .hero__intro .h-display {
  margin: 12px 0 18px;
}

.page-home .hero__intro .lede {
  max-width: 40em;
}

/* 首屏视觉 */
.page-home .hero__visual {
  position: relative;
  margin: 0;
  border: 1px solid var(--grid-line);
  background-color: var(--abyss);
  overflow: hidden;
  aspect-ratio: 16 / 7;
  min-height: 180px;
}

.page-home .hero__visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  opacity: 0.88;
}

.page-home .hero__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(112deg, rgba(4, 24, 38, 0.88) 0%, rgba(4, 24, 38, 0.28) 58%, rgba(255, 122, 47, 0.16) 100%);
  pointer-events: none;
}

.page-home .hero__visual figcaption {
  position: absolute;
  left: 14px;
  bottom: 12px;
  z-index: 2;
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--mist);
  background-color: rgba(4, 24, 38, 0.68);
  border-left: 2px solid var(--cyan);
  padding: 5px 10px;
}

/* 首屏三卡 */
.page-home .hero__cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 700px) {
  .page-home .hero__cards {
    grid-template-columns: 1.18fr 1fr 0.92fr;
  }
}

.page-home .hcard {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px 18px 18px;
  background-color: rgba(11, 42, 63, 0.62);
  border: 1px solid var(--grid-line);
  transition: border-color var(--t-fast), transform var(--t-base), background-color var(--t-fast);
}

.page-home .hcard:hover {
  border-color: var(--signal);
  background-color: rgba(11, 42, 63, 0.9);
}

.page-home .hcard .tag {
  align-self: flex-start;
}

.page-home .hcard__title {
  margin: 0;
  font-size: 17px;
  line-height: 1.45;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-home .hcard__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--muted);
}

.page-home .hcard__link {
  margin-top: auto;
  padding-top: 4px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-fast), color var(--t-fast);
}

.page-home .hcard__link::after {
  content: "→";
  transition: transform var(--t-fast);
}

.page-home .hcard__link:hover {
  border-bottom-color: var(--signal);
}

.page-home .hcard__link:hover::after {
  transform: translateX(4px);
}

/* ---------- 版本要点 ---------- */
.page-home .ph-version {
  padding: var(--ph-pad) 0;
  background-color: var(--deep);
  border-bottom: 1px solid var(--grid-line);
}

.page-home .ph-version__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.4vw, 44px);
}

@media (min-width: 900px) {
  .page-home .ph-version__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }
}

.page-home .ph-version__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-home .ph-version__item {
  position: relative;
  padding: 18px 20px 18px 22px;
  background-color: rgba(4, 24, 38, 0.58);
  border-left: 3px solid var(--grid);
  transition: background-color var(--t-fast);
}

.page-home .ph-version__item:nth-child(1) { border-left-color: var(--signal); }
.page-home .ph-version__item:nth-child(2) { border-left-color: var(--cyan); }
.page-home .ph-version__item:nth-child(3) { border-left-color: var(--amber); }

.page-home .ph-version__item:hover {
  background-color: rgba(4, 24, 38, 0.86);
}

.page-home .ph-version__item .tag {
  display: inline-block;
}

.page-home .ph-version__item h3 {
  margin: 10px 0 8px;
  font-size: 17px;
  line-height: 1.45;
  color: var(--mist);
}

.page-home .ph-version__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--muted);
  max-width: 36em;
}

.page-home .ph-version__figure {
  margin: 0;
  border: 1px solid var(--grid-line);
  background-color: var(--abyss);
  overflow: hidden;
}

.page-home .ph-version__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 6.4;
  object-fit: cover;
}

.page-home .ph-version__figure figcaption {
  padding: 10px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
  border-top: 1px solid var(--grid-line);
}

/* ---------- 线路状态 ---------- */
.page-home .ph-lines {
  padding: var(--ph-pad) 0;
  background-color: var(--bg);
  border-bottom: 1px solid var(--grid-line);
}

.page-home .ph-lines__figure {
  margin: 0 0 clamp(24px, 3.2vw, 38px);
  border: 1px solid var(--grid-line);
  background-color: var(--abyss);
  overflow: hidden;
}

.page-home .ph-lines__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 5;
  object-fit: cover;
}

.page-home .ph-lines__figure figcaption {
  padding: 10px 14px;
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--muted);
  border-top: 1px solid var(--grid-line);
}

.page-home .ph-lines__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 760px) {
  .page-home .ph-lines__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-home .ph-lines__grid > :nth-child(2) {
    transform: translateY(14px);
  }
}

.page-home .lstate {
  padding: 20px 18px 18px;
  background-color: rgba(11, 42, 63, 0.5);
  border: 1px solid var(--grid-line);
  transition: border-color var(--t-fast), background-color var(--t-fast);
}

.page-home .lstate:hover {
  border-color: var(--signal);
  background-color: rgba(11, 42, 63, 0.86);
}

.page-home .lstate h3 {
  margin: 10px 0 8px;
  font-size: 18px;
  letter-spacing: 0.05em;
  color: var(--mist);
}

.page-home .lstate p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-home .lstate .lstate__hint {
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed var(--grid-line);
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--signal);
}

/* ---------- 登录排查 ---------- */
.page-home .ph-steps {
  padding: var(--ph-pad) 0;
  background-color: var(--hull);
  border-bottom: 1px solid var(--grid-line);
}

.page-home .ph-steps__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.4vw, 44px);
}

@media (min-width: 900px) {
  .page-home .ph-steps__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
  }
}

.page-home .ph-steps__figure {
  margin: 0;
  border: 1px solid var(--grid-line);
  background-color: var(--abyss);
  overflow: hidden;
}

.page-home .ph-steps__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-home .ph-steps__figure figcaption {
  padding: 10px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
  border-top: 1px solid var(--grid-line);
}

.page-home .step-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-home .step-item {
  position: relative;
  padding-left: 38px;
}

.page-home .step-item::before {
  content: "";
  position: absolute;
  left: 11.5px;
  top: 30px;
  bottom: -18px;
  width: 1px;
  background-color: var(--grid-line);
}

.page-home .step-item:last-child::before {
  display: none;
}

.page-home .step-item__num {
  position: absolute;
  left: 0;
  top: 2px;
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background-color: var(--cyan);
  color: var(--abyss);
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 700;
}

.page-home .step-item h3 {
  margin: 0 0 6px;
  padding-top: 2px;
  font-size: 17px;
  line-height: 1.45;
  color: var(--mist);
}

.page-home .step-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--muted);
  max-width: 34em;
}

/* ---------- 双端场景 ---------- */
.page-home .ph-platforms {
  padding: var(--ph-pad) 0;
  background-color: var(--bg);
  border-bottom: 1px solid var(--grid-line);
}

.page-home .ph-platforms__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 780px) {
  .page-home .ph-platforms__grid {
    grid-template-columns: 1.06fr 1fr 0.94fr;
  }
}

.page-home .pcard {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px;
  background-color: var(--panel);
  border: 1px solid var(--grid-line);
  transition: border-color var(--t-fast), transform var(--t-base);
}

.page-home .pcard:hover {
  border-color: var(--signal);
}

.page-home .pcard--sync {
  border-color: rgba(35, 211, 176, 0.38);
  background-color: rgba(35, 211, 176, 0.06);
}

.page-home .pcard--sync:hover {
  border-color: var(--cyan);
}

.page-home .pcard__kicker {
  margin: 0;
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--signal);
}

.page-home .pcard--sync .pcard__kicker {
  color: var(--cyan);
}

.page-home .pcard h3 {
  margin: 0;
  font-size: 17px;
  line-height: 1.5;
  color: var(--mist);
}

.page-home .pcard__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--muted);
}

/* ---------- 服务通道 ---------- */
.page-home .ph-service {
  padding: var(--ph-pad) 0 calc(var(--ph-pad) * 0.7);
  background-color: var(--deep);
}

.page-home .ph-service__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 820px) {
  .page-home .ph-service__grid {
    grid-template-columns: 1fr 1fr 1.45fr;
  }
}

.page-home .contact-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px 20px;
  background-color: rgba(4, 24, 38, 0.6);
  border: 1px solid var(--grid-line);
  transition: border-color var(--t-fast);
}

.page-home .contact-card:hover {
  border-color: var(--signal);
}

.page-home .contact-card__label {
  margin: 0;
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fade);
}

.page-home .contact-card__value {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--mist);
  word-break: break-all;
}

.page-home .contact-card__list {
  margin: 0;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

.page-home .contact-card__list li {
  margin-bottom: 5px;
}

.page-home .contact-card .ghost-btn {
  align-self: flex-start;
}

.page-home .contact-card--wide .btn {
  align-self: flex-start;
  margin-top: 4px;
}

/* ---------- 响应式收敛 ---------- */
@media (max-width: 699px) {
  .page-home .hcard,
  .page-home .lstate,
  .page-home .pcard,
  .page-home .contact-card {
    padding: 18px 16px;
  }

  .page-home .ph-lines__figure img {
    aspect-ratio: 3 / 2;
  }

  .page-home .hero__visual {
    aspect-ratio: 5 / 3;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-home .hcard:hover,
  .page-home .pcard:hover,
  .page-home .lstate:hover {
    transform: none;
  }
}
</main>