.page-about {
  --about-rail: 38%;
  --about-hair: 1px solid var(--line-dark);
  --about-narrative: clamp(48px, 7vw, 96px);
  background: var(--indigo-950);
  color: var(--paper-50);
  overflow-x: clip;
}

/* ---------------- 面包屑 ---------------- */
.page-about .about-crumb {
  padding: clamp(18px, 3vw, 30px) 0 0;
}
.page-about .about-crumb a {
  color: var(--cyan-400);
  text-decoration: none;
}
.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* ---------------- 首屏 ---------------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(36px, 6vw, 78px) 0 clamp(48px, 7vw, 100px);
  background-color: var(--indigo-950);
  background-image:
    radial-gradient(110% 82% at 88% 0%, rgba(255, 122, 26, 0.2), transparent 60%),
    radial-gradient(72% 64% at 0% 100%, rgba(47, 224, 208, 0.12), transparent 64%);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--ember-500) 28%, rgba(47, 224, 208, 0.6) 72%, transparent);
  opacity: 0.55;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 60px);
}

.page-about .about-hero__title {
  margin: clamp(12px, 2vw, 20px) 0 clamp(16px, 2.4vw, 26px);
  font-size: clamp(36px, 7.2vw, 80px);
  line-height: 1.03;
}

.page-about .about-hero__dek {
  max-width: 34em;
  margin: 0 0 clamp(24px, 3.4vw, 36px);
  font-size: clamp(16px, 1.55vw, 18px);
  line-height: 1.8;
  color: rgba(247, 244, 239, 0.82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 16px;
}

.page-about .about-hero__panel {
  position: relative;
  padding: clamp(22px, 3vw, 34px);
  background: var(--indigo-800);
  border: 1px solid var(--line-dark);
  box-shadow: var(--shadow-soft);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), calc(100% - 34px) 100%, 0 100%);
}
.page-about .about-hero__panel::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 34px;
  left: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--ember-500), var(--gold-400) 46%, transparent);
}
.page-about .about-hero__panel-title {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--mist-400);
}

.page-about .about-metrics {
  list-style: none;
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  padding: 0;
}
.page-about .about-metric {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 13px 0;
  border-top: 1px solid var(--line-dark);
}
.page-about .about-metric:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .about-metric__num {
  font-size: clamp(30px, 3.6vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--ember-500);
  letter-spacing: -0.02em;
}
.page-about .about-metric__unit {
  font-size: 14px;
  color: var(--paper-50);
}
.page-about .about-metric__label {
  margin-left: auto;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist-400);
  text-align: right;
}

/* ---------------- 叙事区 ---------------- */
.page-about .about-story {
  position: relative;
  padding: clamp(48px, 8vw, 100px) 0 clamp(56px, 9vw, 120px);
}

.page-about .about-story__vertical {
  display: none;
}

.page-about .about-story__title {
  margin: 0 0 clamp(32px, 5vw, 56px);
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: 0.01em;
  color: var(--paper-50);
}
.page-about .about-story__title::after {
  content: "";
  display: block;
  width: 56px;
  height: 2px;
  margin-top: 18px;
  background: var(--ember-500);
}

.page-about .about-story__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 56px);
}

/* --- 左侧纵向时间轴 --- */
.page-about .about-story__rail {
  min-width: 0;
}
.page-about .about-rail__note {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--mist-400);
}
.page-about .about-rail__track {
  position: relative;
  padding-left: 26px;
}
.page-about .about-rail__track::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(
    to bottom,
    var(--ember-500),
    rgba(255, 194, 75, 0.5) 42%,
    rgba(47, 224, 208, 0.45) 78%,
    transparent
  );
}
.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-about .about-node {
  position: relative;
  width: 100%;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 2px 12px;
  padding: 13px 14px 13px 16px;
  background: transparent;
  border: 1px solid transparent;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: background var(--dur) var(--ease-shot),
              border-color var(--dur) var(--ease-shot);
}
.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -26.5px;
  top: 19px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--indigo-950);
  border: 1px solid var(--line-dark);
  transition: background var(--dur) var(--ease-shot),
              border-color var(--dur) var(--ease-shot),
              box-shadow var(--dur) var(--ease-shot);
}
.page-about .about-node:hover {
  background: rgba(47, 224, 208, 0.07);
}
.page-about .about-node:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 2px;
}
.page-about .about-node__idx {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--mist-400);
}
.page-about .about-node__label {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: rgba(247, 244, 239, 0.86);
}
.page-about .about-node__meta {
  grid-column: 2;
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--mist-400);
}
.page-about .about-node[aria-selected="true"] {
  background: linear-gradient(100deg, rgba(255, 122, 26, 0.17), rgba(255, 122, 26, 0) 78%);
  border-color: rgba(255, 122, 26, 0.42);
}
.page-about .about-node[aria-selected="true"]::before {
  background: var(--ember-500);
  border-color: var(--ember-500);
  box-shadow: 0 0 0 4px rgba(255, 122, 26, 0.2);
}
.page-about .about-node[aria-selected="true"] .about-node__idx {
  color: var(--ember-500);
}
.page-about .about-node[aria-selected="true"] .about-node__label {
  color: var(--paper-50);
}

/* --- 右侧叙事 --- */
.page-about .about-story__panels {
  min-width: 0;
}

.page-about .about-chapter + .about-chapter {
  margin-top: var(--about-narrative);
  padding-top: var(--about-narrative);
  border-top: 1px solid var(--line-dark);
}

.page-about .about-chapter__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan-400);
}
.page-about .about-chapter__title {
  margin: 10px 0 clamp(16px, 2.2vw, 24px);
  font-size: clamp(25px, 3.4vw, 44px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.012em;
  color: var(--paper-50);
  transform: rotate(-1.1deg);
  transform-origin: left center;
}
.page-about .about-chapter p {
  max-width: 38em;
  margin: 0 0 1.15em;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(247, 244, 239, 0.82);
}
.page-about .about-chapter p:last-child {
  margin-bottom: 0;
}
.page-about .about-chapter__note {
  margin-top: clamp(22px, 3vw, 32px) !important;
  padding-left: 16px;
  border-left: 2px solid var(--gold-400);
  font-size: 14px !important;
  color: var(--mist-400) !important;
}

/* --- 数字行 --- */
.page-about .about-figures {
  list-style: none;
  max-width: 44em;
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  padding: clamp(18px, 2.4vw, 26px) 0;
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(128px, 1fr));
  gap: clamp(16px, 2.4vw, 28px);
}
.page-about .about-figure__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ember-500);
}
.page-about .about-figure__label {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--mist-400);
}

/* --- 图片 --- */
.page-about .about-chapter__figure {
  max-width: 46em;
  margin: clamp(24px, 3.4vw, 42px) 0 0;
}
.page-about .about-chapter__figure .wk-media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* --- 四项服务 --- */
.page-about .about-services {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(22px, 3vw, 34px) 0 0;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}
.page-about .about-service {
  background: var(--indigo-950);
  padding: clamp(20px, 2.6vw, 30px);
}
.page-about .about-service__no {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan-400);
}
.page-about .about-service__title {
  margin: 10px 0 8px;
  font-size: clamp(17px, 1.7vw, 20px);
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--paper-50);
}
.page-about .about-service__text {
  max-width: none;
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(247, 244, 239, 0.76);
}

/* --- 双通道 --- */
.page-about .about-channels {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.2vw, 22px);
  margin: clamp(22px, 3vw, 32px) 0 0;
}
.page-about .about-channel {
  position: relative;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--indigo-800);
  border: 1px solid var(--line-dark);
}
.page-about .about-channel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 46px;
  height: 2px;
  background: var(--cyan-400);
}
.page-about .about-channel--ember::before {
  background: var(--ember-500);
}
.page-about .about-channel__title {
  margin: 0 0 10px;
  font-size: clamp(16px, 1.6vw, 19px);
  font-weight: 800;
  color: var(--paper-50);
}
.page-about .about-channel__text {
  max-width: none;
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(247, 244, 239, 0.78);
}

/* --- 步骤条目 --- */
.page-about .about-steps {
  list-style: none;
  max-width: 42em;
  margin: clamp(24px, 3.2vw, 36px) 0 0;
  padding: 0;
}
.page-about .about-step {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 0 14px;
  padding: 15px 0;
  border-top: 1px solid var(--line-dark);
}
.page-about .about-step:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .about-step__no {
  padding-top: 3px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gold-400);
}
.page-about .about-step p {
  max-width: none;
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: rgba(247, 244, 239, 0.8);
}

/* ---------------- 收尾 ---------------- */
.page-about .about-cta {
  position: relative;
  padding: clamp(52px, 8vw, 104px) 0 clamp(60px, 9vw, 116px);
  background-color: var(--indigo-800);
  background-image: linear-gradient(102deg, rgba(255, 122, 26, 0.18), rgba(8, 12, 36, 0) 62%);
  border-top: 1px solid var(--line-dark);
}
.page-about .about-cta::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: clamp(80px, 22vw, 320px);
  height: 2px;
  background: linear-gradient(90deg, var(--ember-500), var(--cyan-400));
}
.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: end;
}
.page-about .about-cta__title {
  margin: 0 0 14px;
  font-size: clamp(26px, 3.6vw, 46px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.012em;
  color: var(--paper-50);
  transform: rotate(-1.1deg);
  transform-origin: left center;
}
.page-about .about-cta__text {
  max-width: 34em;
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(247, 244, 239, 0.8);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 16px;
}

/* ---------------- 响应式 ---------------- */
@media (min-width: 720px) {
  .page-about .about-services {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-channels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: end;
    gap: clamp(40px, 5vw, 72px);
  }
  .page-about .about-cta__inner {
    grid-template-columns: 7fr 5fr;
    gap: clamp(32px, 4vw, 64px);
  }
  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1000px) {
  .page-about .about-story__split {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 88px);
    align-items: start;
  }
  .page-about .about-story__rail {
    position: sticky;
    top: 108px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-story__vertical {
    display: block;
    position: absolute;
    top: clamp(140px, 13vw, 220px);
    left: clamp(4px, calc((100vw - var(--shell)) / 2), 240px);
    writing-mode: vertical-rl;
    letter-spacing: 0.36em;
    font-size: 12px;
    color: var(--mist-400);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-node::before {
    transition: none;
  }
  .page-about .about-chapter__title,
  .page-about .about-cta__title {
    transform: none;
  }
}