.page-about {
  --about-pad: clamp(20px, 5vw, 56px);
  --about-gap: clamp(28px, 5vw, 56px);
  background: var(--paper);
  color: var(--text);
  font-family: var(--font-sans);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 48px) 0 clamp(40px, 6vw, 78px);
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -25%;
  right: -30%;
  width: 70%;
  height: 150%;
  background: radial-gradient(closest-side, rgba(24, 224, 208, 0.16), transparent 72%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: var(--about-gap);
  align-items: center;
}

.page-about .about-hero .breadcrumb__link,
.page-about .about-hero .breadcrumb__sep {
  color: rgba(247, 242, 232, 0.6);
}

.page-about .about-hero .breadcrumb__current {
  color: var(--cyan);
}

.page-about .about-hero .eyebrow {
  margin-top: 18px;
  color: var(--lamp);
  border-color: rgba(255, 209, 102, 0.55);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-size: clamp(34px, 8vw, 66px);
  line-height: 1.04;
  font-weight: 800;
  letter-spacing: -0.025em;
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: clamp(15px, 2.4vw, 18px);
  line-height: 1.8;
  color: rgba(247, 242, 232, 0.82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
  margin: 30px 0 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid rgba(247, 242, 232, 0.18);
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-hero__fact b {
  font-family: var(--font-num);
  font-size: clamp(24px, 5vw, 32px);
  line-height: 1;
  font-weight: 700;
  color: var(--lamp);
  letter-spacing: -0.02em;
}

.page-about .about-hero__fact span {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--slate);
}

.page-about .about-hero__visual {
  position: relative;
  aspect-ratio: 5 / 4;
  min-height: 220px;
}

.page-about .about-hero__lanes {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.page-about .about-hero__lanes .lane-a {
  fill: none;
  stroke: rgba(24, 224, 208, 0.6);
  stroke-width: 2;
}

.page-about .about-hero__lanes .lane-b {
  fill: none;
  stroke: rgba(255, 106, 42, 0.5);
  stroke-width: 2;
  stroke-dasharray: 10 12;
}

.page-about .about-hero__lanes .lane-c {
  fill: none;
  stroke: rgba(247, 242, 232, 0.18);
  stroke-width: 1.5;
}

.page-about .about-hero__lanes .dot {
  fill: var(--lamp);
}

.page-about .about-hero__lanes .dot--orange {
  fill: var(--orange);
}

.page-about .about-hero__plate {
  position: absolute;
  left: 2%;
  bottom: 4%;
  display: flex;
  align-items: flex-end;
  gap: 10px;
  padding: 12px 16px;
  background: rgba(11, 20, 22, 0.74);
  border: 1px solid rgba(24, 224, 208, 0.42);
  border-radius: 2px 18px 2px 18px;
}

.page-about .about-hero__plate-num {
  font-family: var(--font-num);
  font-size: clamp(44px, 11vw, 76px);
  line-height: 0.82;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: -0.04em;
}

.page-about .about-hero__plate-cap {
  font-size: 11px;
  letter-spacing: 0.28em;
  color: rgba(247, 242, 232, 0.8);
  writing-mode: vertical-rl;
}

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

/* ---------- 章节目录 ---------- */
.page-about .about-toc {
  position: sticky;
  top: var(--topbar-h);
  z-index: 15;
  background: var(--sand);
  border-bottom: 1px solid rgba(26, 35, 36, 0.16);
}

.page-about .about-toc__list {
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 9px var(--about-pad);
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-toc__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc__link {
  display: inline-flex;
  gap: 8px;
  align-items: baseline;
  padding: 8px 12px;
  font-size: 13px;
  line-height: 1.2;
  white-space: nowrap;
  color: var(--slate-deep);
  text-decoration: none;
  border-radius: 2px;
  transition: background 0.25s ease, color 0.25s ease;
}

.page-about .about-toc__num {
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .about-toc__link:hover {
  background: rgba(26, 35, 36, 0.08);
}

.page-about .about-toc__link[aria-current="true"] {
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-toc__link[aria-current="true"] .about-toc__num {
  color: var(--cyan);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: clamp(40px, 7vw, 92px) 0;
}

.page-about .about-section__head {
  max-width: 60ch;
}

.page-about .about-section__title {
  margin: 10px 0 0;
  font-size: clamp(26px, 5.4vw, 44px);
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.page-about .about-section__lead {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate-deep);
}

.page-about .about-figure {
  margin: 28px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 4px 26px 4px 26px;
  object-fit: cover;
  background: linear-gradient(140deg, #0B1416, #12352E);
}

.page-about .about-figure__caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--slate-deep);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  margin: clamp(28px, 5vw, 46px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .milestone {
  --i: 0;
  position: relative;
  padding: 16px 18px 18px 20px;
  background: var(--sand);
  border-left: 3px solid rgba(255, 106, 42, 0.72);
  border-radius: 0 16px 16px 0;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .milestone:hover,
.page-about .milestone:focus-within {
  transform: translateX(4px);
  border-left-color: var(--cyan);
  box-shadow: 0 14px 30px rgba(11, 20, 22, 0.14);
}

.page-about .milestone__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
}

.page-about .milestone__season {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
  white-space: nowrap;
}

.page-about .milestone__title {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .milestone__text {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--slate-deep);
}

.page-about .milestone__more {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--slate-deep);
}

.page-about .milestone__more > span {
  display: block;
}

/* ---------- 数据章节 ---------- */
.page-about .about-data {
  padding: clamp(40px, 7vw, 92px) 0;
  background: var(--deep-green);
  color: var(--paper);
}

.page-about .about-data__eyebrow {
  color: var(--lamp);
  border-color: rgba(255, 209, 102, 0.55);
}

.page-about .about-data__title {
  color: var(--paper);
}

.page-about .about-data__lead {
  margin: 14px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 242, 232, 0.78);
}

.page-about .board {
  margin-top: clamp(24px, 4vw, 36px);
  padding: clamp(18px, 3vw, 30px);
  border: 1px solid rgba(24, 224, 208, 0.28);
  border-radius: 4px 26px 4px 26px;
  background-image:
    linear-gradient(rgba(247, 242, 232, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(247, 242, 232, 0.055) 1px, transparent 1px);
  background-size: 34px 34px;
}

.page-about .stat-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(28px, 6.5vw, 44px);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .stat__num--lamp {
  color: var(--lamp);
}

.page-about .stat__unit {
  display: block;
  margin-top: 6px;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: rgba(247, 242, 232, 0.62);
}

.page-about .stat__cap {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(247, 242, 232, 0.82);
}

.page-about .about-data__split {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  margin-top: clamp(24px, 4vw, 38px);
}

.page-about .flow {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-about .flow__step {
  position: relative;
  padding-left: 16px;
  border-left: 1px dashed rgba(24, 224, 208, 0.4);
}

.page-about .flow__idx {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--lamp);
}

.page-about .flow__title {
  margin: 4px 0 0;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .flow__text {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(247, 242, 232, 0.75);
}

.page-about .about-figure--data {
  margin: 0;
}

.page-about .about-figure--data .about-figure__caption {
  color: rgba(247, 242, 232, 0.62);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .roster {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-about .roster__item {
  --w: 0%;
  display: grid;
  gap: 7px;
}

.page-about .roster__head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 14px;
  font-weight: 600;
}

.page-about .roster__count {
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--slate-deep);
}

.page-about .roster__bar {
  height: 10px;
  background: rgba(26, 35, 36, 0.1);
  border-radius: 99px;
  overflow: hidden;
}

.page-about .roster__fill {
  display: block;
  width: var(--w);
  height: 100%;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--deep-green), var(--cyan));
}

.page-about .roster__fill--cyan {
  background: linear-gradient(90deg, var(--cyan), #0f8f86);
}

.page-about .roster__fill--orange {
  background: linear-gradient(90deg, var(--orange), var(--lamp));
}

.page-about .about-team__eco-label {
  margin: 30px 0 12px;
  font-size: 11.5px;
  letter-spacing: 0.24em;
  color: var(--slate-deep);
}

.page-about .eco {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .eco__card {
  padding: 18px 20px;
  background: var(--sand);
  border: 1px solid transparent;
  border-radius: 18px 4px 18px 4px;
  transition: transform 0.3s ease, border-color 0.3s ease, background 0.3s ease;
}

.page-about .eco__card:hover {
  transform: translateY(-4px);
  border-color: var(--orange);
  background: linear-gradient(135deg, #E8D9BE, #F7F2E8);
}

.page-about .eco__num {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(30px, 7vw, 40px);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--deep-green);
}

.page-about .eco__num span {
  margin-left: 6px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--slate-deep);
}

.page-about .eco__cap {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--slate-deep);
}

/* ---------- 覆盖与地域 ---------- */
.page-about .about-coverage {
  padding: clamp(40px, 7vw, 92px) 0;
  background: var(--sand);
}

.page-about .about-coverage__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
}

.page-about .about-coverage__text {
  margin: 14px 0 22px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--slate-deep);
}

.page-about .about-coverage__figure {
  position: relative;
  margin: 0;
}

.page-about .about-coverage__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 26px 4px 26px 4px;
  object-fit: cover;
  background: linear-gradient(200deg, #E8D9BE, #12352E);
}

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

/* ---------- 为什么留下 ---------- */
.page-about .why-list {
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: rgba(26, 35, 36, 0.14);
  border-radius: 6px;
  overflow: hidden;
}

.page-about .why-item {
  display: grid;
  gap: 8px;
  padding: 18px 20px;
  background: var(--paper);
  transition: background 0.25s ease;
}

.page-about .why-item:hover {
  background: #FBF7EF;
}

.page-about .why-item__key {
  font-size: 15px;
  font-weight: 700;
  color: var(--deep-green);
}

.page-about .why-item__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--slate-deep);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: clamp(26px, 4vw, 38px);
}

.page-about .about-cta__text {
  font-size: 14px;
  color: var(--deep-green);
  text-decoration: none;
  border-bottom: 1px solid var(--orange);
  padding-bottom: 2px;
}

.page-about .about-cta__text:hover {
  color: var(--orange);
}

/* ---------- 返回顶部 ---------- */
.page-about .to-top {
  position: fixed;
  right: 16px;
  bottom: 18px;
  z-index: 30;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(24, 224, 208, 0.5);
  border-radius: 50%;
  background: var(--ink);
  color: var(--cyan);
  font-size: 17px;
  cursor: pointer;
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.page-about .to-top[data-visible="true"] {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}

.page-about .to-top:hover {
  border-color: var(--orange);
  color: var(--orange);
}

/* ---------- 中屏以上 ---------- */
@media (min-width: 700px) {
  .page-about .stat-row {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .eco {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .why-item {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
    padding: 20px 24px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-hero__visual {
    aspect-ratio: 4 / 3.4;
    min-height: 340px;
  }

  .page-about .about-hero__tag {
    display: block;
    position: absolute;
    top: 0;
    right: 4px;
    font-size: 10.5px;
    letter-spacing: 0.34em;
    color: rgba(247, 242, 232, 0.42);
    writing-mode: vertical-rl;
  }

  .page-about .about-toc {
    top: 0;
  }

  .page-about .about-toc__list {
    justify-content: flex-start;
    gap: 8px;
    padding: 12px var(--about-pad);
  }

  .page-about .about-toc__link {
    font-size: 13.5px;
    padding: 9px 14px;
  }

  .page-about .about-history .about-figure img {
    max-height: 420px;
  }

  .page-about .timeline {
    gap: 12px;
  }

  .page-about .milestone {
    margin-inline-start: calc(var(--i) * 5%);
    padding: 20px 24px 22px 26px;
  }

  .page-about .milestone__more {
    display: grid;
    grid-template-rows: 0fr;
    margin-top: 0;
    opacity: 0;
    transition: grid-template-rows 0.35s ease, opacity 0.3s ease, margin-top 0.35s ease;
  }

  .page-about .milestone__more > span {
    overflow: hidden;
  }

  .page-about .milestone:hover .milestone__more,
  .page-about .milestone:focus-within .milestone__more {
    grid-template-rows: 1fr;
    margin-top: 10px;
    opacity: 1;
  }

  .page-about .about-data__split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 20px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .about-team__eco-label {
    margin-top: 6px;
  }

  .page-about .about-coverage__grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-note {
    display: block;
    position: absolute;
    top: 6px;
    right: -26px;
    font-size: 10.5px;
    letter-spacing: 0.32em;
    color: var(--slate-deep);
    writing-mode: vertical-rl;
  }

  .page-about .to-top {
    right: 28px;
    bottom: 26px;
    width: 48px;
    height: 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .milestone,
  .page-about .eco__card,
  .page-about .to-top,
  .page-about .why-item {
    transition: none;
  }
}
<<<PAGE_CSS_END>>>