.page-about {
  --about-paper-ink: #0B2130;
  --about-paper-body: #1B3A4B;
  --about-line: rgba(246, 241, 232, 0.10);
  --about-side-width: 232px;
  background-color: var(--ink);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(20px, 4vw, 40px) clamp(34px, 6vw, 68px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -25%;
  right: -12%;
  width: 48%;
  height: 145%;
  background: linear-gradient(158deg, rgba(45, 226, 230, 0.15), rgba(7, 21, 33, 0) 64%);
  transform: skewX(-6deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -8%;
  bottom: -22%;
  width: 34%;
  height: 60%;
  background: radial-gradient(circle at 40% 40%, rgba(255, 106, 42, 0.14), rgba(7, 21, 33, 0) 68%);
  pointer-events: none;
}

.page-about .about-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(18px, 3vw, 34px);
}

.page-about h1 {
  margin: 12px 0 18px;
  font-family: var(--font-display);
  font-size: clamp(30px, 5.4vw, 60px);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.022em;
  color: var(--paper);
}

.page-about .about-hero .lede {
  max-width: 42ch;
  margin: 0;
  line-height: 1.78;
}

.page-about .about-hero__rail {
  padding: 22px 20px 20px;
  background: var(--ink-2);
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius-lg);
}

.page-about .about-rail__label {
  margin: 0 0 12px;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0 0 4px;
  padding: 0;
}

.page-about .about-rail__list li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding-block: 11px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper);
  border-bottom: 1px dashed var(--about-line);
}

.page-about .about-rail__list li:last-child {
  border-bottom: 0;
}

.page-about .about-rail__list .mono {
  flex: none;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-rail .btn {
  width: 100%;
  margin-top: 14px;
  text-align: center;
}

.page-about .about-metrics {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 5vw, 46px) 0 0;
  padding: 0;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-metrics li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: var(--ink-2);
}

.page-about .about-metrics__num {
  font-size: clamp(26px, 4.6vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan-soft);
}

.page-about .about-metrics__unit {
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  padding-block: clamp(26px, 4.5vw, 48px) clamp(46px, 7vw, 84px);
}

.page-about .about-layout {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
}

.page-about .about-side .toc {
  padding: 18px 18px 14px;
  background: var(--ink-2);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-md);
}

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

.page-about .about-side__note {
  margin-top: 14px;
  padding: 14px 16px;
  border-left: 2px solid var(--orange);
  background: rgba(255, 106, 42, 0.07);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.page-about .about-side__note-title {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--orange-soft);
}

.page-about .about-side__note p:last-child {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  padding-block: clamp(26px, 4vw, 42px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-chapter__head {
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .about-chapter__num {
  display: block;
  font-size: clamp(38px, 8vw, 78px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: rgba(45, 226, 230, 0.26);
}

.page-about .about-chapter h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(23px, 3.6vw, 36px);
  font-weight: 600;
  line-height: 1.22;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-chapter__lead {
  margin: 14px 0 0;
  max-width: 44ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-chapter h3 {
  margin: 0 0 8px;
  font-size: clamp(17px, 2.2vw, 20px);
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-chapter p {
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist);
}

/* ---------- 01 宣言（暖白区） ---------- */
.page-about .about-chapter--paper {
  margin-bottom: clamp(26px, 4vw, 42px);
  padding: clamp(24px, 4vw, 46px);
  background: var(--paper);
  color: var(--about-paper-body);
  border-top: 0;
  border-radius: var(--radius-lg);
}

.page-about .about-chapter--paper .about-chapter__num {
  color: rgba(255, 106, 42, 0.34);
}

.page-about .about-chapter--paper .eyebrow {
  color: #0F6272;
}

.page-about .about-chapter--paper h2,
.page-about .about-chapter--paper h3 {
  color: var(--about-paper-ink);
}

.page-about .about-chapter--paper p,
.page-about .about-chapter--paper .media__caption {
  color: var(--about-paper-body);
}

.page-about .about-manifesto {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-manifesto__text p {
  margin: 0 0 14px;
}

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

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

.page-about .about-manifesto__media img,
.page-about .about-timeline__side img,
.page-about .about-team__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.page-about .about-chapter--paper .media__caption {
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.6;
  opacity: 0.78;
}

.page-about .about-principles {
  list-style: none;
  display: grid;
  gap: 16px;
  margin: clamp(22px, 3.5vw, 32px) 0 0;
  padding: 0;
}

.page-about .about-principles li {
  padding-top: 12px;
  border-top: 2px solid var(--about-paper-ink);
}

.page-about .about-principles li:nth-child(1) {
  border-top-color: #FF6A2A;
}

.page-about .about-principles li:nth-child(2) {
  border-top-color: #0E8F96;
}

.page-about .about-principles li:nth-child(3) {
  border-top-color: #1F8A62;
}

.page-about .about-principles h3 {
  font-size: 16px;
}

.page-about .about-principles p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
}

/* ---------- 02 时间线 ---------- */
.page-about .filter-bar {
  margin-bottom: clamp(22px, 3vw, 30px);
}

.page-about .about-timeline-wrap {
  display: grid;
  gap: clamp(24px, 3.5vw, 34px);
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, rgba(45, 226, 230, 0.9), rgba(45, 226, 230, 0.12) 62%, rgba(255, 106, 42, 0.55));
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(22px, 3vw, 30px);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__dot {
  position: absolute;
  left: -30px;
  top: 7px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
}

.page-about .about-timeline__item:nth-child(even) .about-timeline__dot {
  border-color: var(--orange);
}

.page-about .about-timeline__stage {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan-soft);
}

.page-about .about-timeline__item:nth-child(even) .about-timeline__stage {
  color: var(--orange-soft);
}

.page-about .about-timeline__item p:not(.about-timeline__stage) {
  margin: 0;
  max-width: 46ch;
  font-size: 14px;
  line-height: 1.78;
}

.page-about .about-timeline__side {
  display: grid;
  gap: 16px;
  align-content: start;
}

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

.page-about .about-timeline__side .media__caption {
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-note {
  padding: 16px 18px;
}

.page-about .about-note__title {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-note p:last-child {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 03 团队 ---------- */
.page-about .about-team__layout {
  display: grid;
  gap: clamp(22px, 3vw, 32px);
}

.page-about .about-team {
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-team__unit {
  padding: 2px 16px;
  background: var(--ink-2);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-md);
  transition: border-color 220ms var(--ease);
}

.page-about .about-team__unit[open] {
  border-color: rgba(45, 226, 230, 0.42);
}

.page-about .about-team__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-block: 14px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-team__index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  color: var(--cyan);
  font-size: 11px;
}

.page-about .about-team__unit:nth-child(2) .about-team__index {
  border-color: var(--orange);
  color: var(--orange);
}

.page-about .about-team__unit:nth-child(3) .about-team__index {
  border-color: var(--cyan-soft);
  color: var(--cyan-soft);
}

.page-about .about-team__unit:nth-child(4) .about-team__index {
  border-color: var(--green);
  color: var(--green);
}

.page-about .about-team__name {
  font-size: 16px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-team__count {
  margin-left: auto;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-team__unit p {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.78;
}

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

.page-about .about-team__media .media__caption {
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 04 覆盖 ---------- */
.page-about .about-reach {
  display: grid;
  gap: clamp(22px, 3.5vw, 34px);
}

.page-about .about-reach__text p {
  margin: 0 0 14px;
  max-width: 46ch;
}

.page-about .about-reach__metrics {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
}

.page-about .about-reach__metrics li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 12px 14px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--paper);
  background: var(--ink-3);
  border-radius: var(--radius-sm);
}

.page-about .about-reach__metrics .mono {
  font-size: 20px;
  font-weight: 700;
  color: var(--orange);
}

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

.page-about .about-reach__grid {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-md);
  background: var(--ink-2);
}

.page-about .about-reach__figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.65;
}

/* ---------- 05 服务 ---------- */
.page-about .about-serve {
  display: grid;
  gap: clamp(22px, 3.5vw, 32px);
}

.page-about .about-serve__paths ol {
  list-style: none;
  counter-reset: about-step;
  margin: 0;
  padding: 0;
}

.page-about .about-serve__paths li {
  counter-increment: about-step;
  position: relative;
  padding: 0 0 18px 42px;
}

.page-about .about-serve__paths li::before {
  content: counter(about-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-serve__paths li::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 6px;
  width: 26px;
  height: 1px;
  background: var(--about-line);
}

.page-about .about-serve__paths li:last-child {
  padding-bottom: 0;
}

.page-about .about-serve__paths li:last-child::after {
  display: none;
}

.page-about .about-serve__paths p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
}

.page-about .about-serve__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-serve__card {
  padding: 20px 20px 22px;
}

.page-about .about-serve__card-title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-serve__list {
  margin: 0;
  padding: 0;
}

.page-about .about-serve__list > div {
  display: grid;
  grid-template-columns: 4.5em minmax(0, 1fr);
  gap: 10px;
  padding-block: 9px;
  border-bottom: 1px dashed var(--about-line);
}

.page-about .about-serve__list > div:last-child {
  border-bottom: 0;
}

.page-about .about-serve__list dt {
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-serve__list dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.page-about .about-serve__tip {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--about-line);
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-serve__tip a {
  color: var(--cyan-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-reach__metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
  }

  .page-about .about-manifesto {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
  }

  .page-about .about-timeline-wrap {
    grid-template-columns: minmax(0, 1fr) 280px;
    align-items: start;
  }

  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
  }

  .page-about .about-reach {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
    align-items: start;
  }

  .page-about .about-serve {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-side-width) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-side {
    position: sticky;
    top: 96px;
  }

  .page-about .about-timeline__side {
    position: sticky;
    top: 96px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__unit {
    transition: none;
  }
}
<<<END>>>