.page-about {
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-body);
}

.page-about .about-top {
  padding-top: clamp(16px, 3vw, 28px);
}

.page-about .breadcrumb {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.06em;
}

/* ---------- 左侧竖排章节导视 ---------- */
.page-about .about-spine {
  position: fixed;
  top: 50%;
  left: max(10px, calc((100vw - 1280px) / 2 - 78px));
  transform: translateY(-50%);
  z-index: 5;
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 18px;
}

@media (min-width: 1200px) {
  .page-about .about-spine {
    display: flex;
  }
}

.page-about .about-spine__item {
  display: flex;
  align-items: center;
  gap: 8px;
  writing-mode: vertical-rl;
  text-decoration: none;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.2em;
  padding: 4px 0;
  transition: color var(--ease);
}

.page-about .about-spine__num {
  font-family: var(--font-num);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--mist);
  transition: color var(--ease);
}

.page-about .about-spine__item:hover {
  color: var(--ink);
}

.page-about .about-spine__item.is-active {
  color: var(--orange);
}

.page-about .about-spine__item.is-active .about-spine__num {
  color: var(--orange);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(20px, 3vw, 36px) 0 clamp(48px, 7vw, 96px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  align-items: end;
}

@media (min-width: 940px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.05fr 0.95fr;
  }
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .about-kicker__no {
  font-family: var(--font-num);
  background: var(--orange);
  color: var(--ink-deep);
  padding: 3px 8px;
  font-size: 11px;
  letter-spacing: 0.08em;
}

.page-about h1 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(36px, 6vw, 72px);
  line-height: 1.04;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-lead {
  margin: 0;
  max-width: 34em;
  font-size: clamp(15px, 1.35vw, 17px);
  line-height: 1.9;
  color: var(--muted);
}

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

.page-about .about-hero__media {
  margin: 0;
}

/* ---------- 通用媒体 ---------- */
.page-about .about-media {
  margin: 0;
}

.page-about .about-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-paper);
  background: var(--paper);
}

.page-about .about-media figcaption {
  margin-top: 10px;
  font-family: var(--font-num);
  font-size: 11.5px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 起源段落 ---------- */
.page-about .about-origin {
  display: grid;
  gap: clamp(16px, 2.6vw, 36px);
  margin-top: clamp(36px, 5vw, 64px);
  padding-top: clamp(22px, 3.4vw, 38px);
  border-top: 2px solid var(--ink);
}

@media (min-width: 900px) {
  .page-about .about-origin {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: start;
  }
}

.page-about .about-h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--hd, var(--ink));
}

.page-about .about-h2--sm {
  font-size: clamp(22px, 3vw, 32px);
  margin-bottom: 0;
}

.page-about .prose p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--txt, var(--muted));
}

.page-about .prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding: clamp(48px, 7vw, 104px) 0;
  --txt: var(--muted);
  --hd: var(--ink);
}

.page-about .about-sec--ink {
  background: var(--ink);
  --txt: var(--mist);
  --hd: var(--cream);
  color: var(--cream);
}

.page-about .about-sec--phases {
  position: relative;
  overflow: hidden;
  background: var(--ink-deep);
  --txt: var(--mist);
  --hd: var(--cream);
  color: var(--cream);
}

.page-about .about-sec--phases::before {
  content: "";
  position: absolute;
  left: -20%;
  right: -20%;
  top: -14%;
  height: 64%;
  transform: skewY(-6deg);
  background: linear-gradient(160deg, rgba(242, 107, 58, 0.3), rgba(63, 224, 200, 0.12) 56%, rgba(7, 21, 18, 0) 82%);
  pointer-events: none;
}

.page-about .about-sec--phases .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-reach__note {
  margin-top: clamp(22px, 3vw, 36px);
  max-width: 62em;
}

.page-about .about-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(24px, 4vw, 48px);
}

.page-about .about-no {
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .about-head__note {
  margin: 0;
  max-width: 40em;
  font-size: 14px;
  line-height: 1.85;
  color: var(--txt);
}

/* ---------- 五步流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0 0 clamp(28px, 4vw, 48px);
  padding: 0;
  border-top: 1px solid var(--line-ink);
}

.page-about .about-step {
  display: grid;
  gap: 6px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-ink);
}

@media (min-width: 760px) {
  .page-about .about-step {
    grid-template-columns: 46px 150px 1fr;
    align-items: baseline;
    gap: 6px 20px;
  }
}

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

.page-about .about-step__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 22px;
  letter-spacing: 0.02em;
  color: var(--hd);
}

.page-about .about-step__text {
  margin: 0;
  max-width: 46em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--txt);
}

.page-about .about-method__media {
  max-width: 780px;
}

.page-about .about-sec--ink .about-media img {
  border-color: var(--line-ink);
  box-shadow: 8px 8px 0 rgba(63, 224, 200, 0.12);
}

.page-about .about-sec--ink .about-media figcaption {
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: start;
  }
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-bottom: 22px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stat {
  background: var(--card);
  padding: 16px 14px;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-num);
  font-weight: 600;
  font-size: clamp(26px, 3.4vw, 34px);
  line-height: 1;
  color: var(--ink);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .about-team__media {
  margin: 0;
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  margin-top: clamp(30px, 4.4vw, 56px);
  padding-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid var(--line);
}

.page-about .about-eco__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.6vw, 26px);
  color: var(--ink);
}

.page-about .about-eco__list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-eco__tag {
  position: relative;
}

.page-about .about-eco__name {
  display: inline-block;
  padding: 9px 15px;
  border: 1px solid var(--ink);
  background: var(--card);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink);
  transition: background var(--ease), color var(--ease);
}

.page-about .about-eco__tag:hover .about-eco__name {
  background: var(--ink);
  color: var(--cream);
}

.page-about .about-eco__tip {
  position: absolute;
  left: 0;
  top: calc(100% + 8px);
  z-index: 6;
  width: min(300px, 74vw);
  padding: 12px 14px;
  background: var(--ink);
  color: var(--cream);
  font-size: 12.5px;
  line-height: 1.75;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity var(--ease), transform var(--ease), visibility var(--ease);
}

.page-about .about-eco__tag:hover .about-eco__tip,
.page-about .about-eco__tag:focus-within .about-eco__tip {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

@media (hover: none) {
  .page-about .about-eco__list {
    flex-direction: column;
    align-items: stretch;
  }

  .page-about .about-eco__name {
    display: block;
  }

  .page-about .about-eco__tip {
    position: static;
    width: auto;
    margin-top: 8px;
    padding: 0;
    background: transparent;
    color: var(--muted);
    opacity: 1;
    visibility: visible;
    transform: none;
  }
}

/* ---------- 斜切时间轴 ---------- */
.page-about .about-tl {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-tl__node {
  background: rgba(244, 239, 228, 0.05);
  border: 1px solid var(--line-ink);
  border-left: 3px solid var(--orange);
  transition: background var(--ease), border-color var(--ease);
}

.page-about .about-tl__node[open] {
  background: rgba(244, 239, 228, 0.09);
  border-left-color: var(--cyan);
}

.page-about .about-tl__node summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-tl__node summary::-webkit-details-marker {
  display: none;
}

.page-about .about-tl__no {
  font-family: var(--font-num);
  font-size: 12px;
  color: var(--cyan);
  letter-spacing: 0.1em;
}

.page-about .about-tl__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.4vw, 25px);
  letter-spacing: 0.02em;
  color: var(--cream);
}

.page-about .about-tl__when {
  margin-left: auto;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mist);
  white-space: nowrap;
}

.page-about .about-tl__body {
  margin: 0;
  padding: 0 18px 18px 46px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

@media (min-width: 900px) {
  .page-about .about-tl__item:nth-child(2) {
    margin-left: 28px;
  }

  .page-about .about-tl__item:nth-child(3) {
    margin-left: 56px;
  }

  .page-about .about-tl__item:nth-child(4) {
    margin-left: 84px;
  }

  .page-about .about-tl__item:nth-child(5) {
    margin-left: 112px;
  }
}

/* ---------- 服务范围 ---------- */
.page-about .about-reach__grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 640px) {
  .page-about .about-reach__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1000px) {
  .page-about .about-reach__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.page-about .about-reach__cell {
  background: var(--card);
  padding: clamp(18px, 2.4vw, 26px);
}

.page-about .about-reach__num {
  display: block;
  font-family: var(--font-num);
  font-weight: 600;
  font-size: clamp(28px, 3.6vw, 40px);
  line-height: 1;
  color: var(--ink);
}

.page-about .about-reach__num small {
  margin-left: 6px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-reach__label {
  display: block;
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 为什么选择我们 ---------- */
.page-about .about-why {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 820px) {
  .page-about .about-why {
    grid-template-columns: repeat(2, 1fr);
  }
}

.page-about .about-why__item {
  background: var(--cream);
  padding: clamp(20px, 3vw, 34px);
}

.page-about .about-why__no {
  display: block;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
  margin-bottom: 12px;
}

.page-about .about-why__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.4vw, 26px);
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-about .about-why__text {
  margin: 0;
  max-width: 34em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 行动区 ---------- */
.page-about .about-cta {
  background: var(--orange);
  color: var(--ink-deep);
  padding: clamp(40px, 6vw, 76px) 0;
}

.page-about .about-cta .about-h2 {
  color: var(--ink-deep);
  max-width: 22em;
}

.page-about .about-cta__inner {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  align-items: end;
}

@media (min-width: 900px) {
  .page-about .about-cta__inner {
    grid-template-columns: 1.2fr 0.8fr;
  }
}

.page-about .about-cta__text p {
  margin: 12px 0 0;
  max-width: 34em;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(7, 21, 18, 0.82);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-cta__actions .btn {
  border-color: var(--ink-deep);
}

.page-about .about-cta__actions .btn--primary {
  background: var(--ink-deep);
  color: var(--cream);
}

.page-about .about-cta__actions .btn--ghost {
  background: transparent;
  color: var(--ink-deep);
  border: 1px solid var(--ink-deep);
}

@media (max-width: 420px) {
  .page-about .about-cta__actions .btn {
    width: 100%;
    text-align: center;
  }
}
<<<PAGE_CSS_END>>>