.page-about {
  display: block;
  padding-top: clamp(16px, 4vw, 32px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

@media (min-width: 1024px) {
  .page-about {
    padding-left: var(--rail-w);
  }
}

/* ---------- 首屏 ---------- */
.page-about .about-intro {
  padding: clamp(22px, 4vw, 40px) 0 clamp(26px, 4vw, 44px);
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-cyan);
  margin: 0 0 16px;
}

.page-about .about-intro .h1 {
  max-width: 18em;
  margin: 0;
}

.page-about .about-intro .lede {
  max-width: 40em;
  margin: 20px 0 0;
  color: var(--c-muted);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-m);
  overflow: hidden;
  margin-top: clamp(26px, 4vw, 40px);
}

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-stat {
  background: var(--c-deep);
  padding: 16px 18px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-stat__value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--c-text);
}

.page-about .about-stat__label {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-muted);
}

/* ---------- 索引 ---------- */
.page-about .about-index {
  padding: clamp(28px, 4vw, 46px) 0 clamp(20px, 3vw, 32px);
}

.page-about .about-index__title {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--c-muted);
  margin: 0 0 14px;
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

@media (min-width: 720px) {
  .page-about .about-index__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .page-about .about-index__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-index__item a {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  height: 100%;
  padding: 16px 18px;
  background: var(--c-deep);
  text-decoration: none;
  color: var(--c-text);
  transition: background 0.16s var(--ease), transform 0.16s var(--ease);
}

.page-about .about-index__item a:hover,
.page-about .about-index__item a:focus-visible {
  background: var(--c-glass);
  transform: translateX(3px);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-cyan);
  padding-top: 4px;
  flex: none;
}

.page-about .about-index__body {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.page-about .about-index__label {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.2;
  letter-spacing: 0.01em;
}

.page-about .about-index__desc {
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-muted);
}

/* ---------- 通用章节 ---------- */
.page-about .about-sec {
  padding: clamp(38px, 6vw, 76px) 0 clamp(30px, 5vw, 60px);
  border-top: 1px solid var(--c-line);
  scroll-margin-top: 24px;
}

.page-about .about-sec--last {
  padding-bottom: clamp(10px, 2vw, 20px);
}

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

.page-about .about-eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-cyan);
  margin: 0 0 12px;
}

.page-about .about-sec__head .h2 {
  max-width: 22em;
  margin: 0;
}

.page-about .about-lead {
  max-width: 40em;
  margin: 0 0 clamp(22px, 3vw, 32px);
  font-size: 17px;
  line-height: 1.7;
  color: var(--c-muted);
}

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

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

/* ---------- 两栏说明 ---------- */
.page-about .about-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 34px);
}

@media (min-width: 900px) {
  .page-about .about-cols {
    grid-template-columns: minmax(0, 1.9fr) minmax(0, 1fr);
  }
  .page-about .about-cols--reverse {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.6fr);
    align-items: start;
  }
}

.page-about .about-cols__side {
  background: var(--c-deep);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-m);
  padding: 18px 20px;
}

.page-about .about-cols__side-k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-orange);
  margin: 0 0 12px;
}

.page-about .about-list {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.page-about .about-list li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  line-height: 1.6;
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 1px;
  background: var(--c-cyan);
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0 0 0 26px;
  border-left: 1px solid var(--c-line);
}

.page-about .tl__item {
  position: relative;
  padding-bottom: clamp(30px, 5vw, 52px);
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -31.5px;
  top: 18px;
  width: 11px;
  height: 11px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--c-ink);
  border: 2px solid var(--c-cyan-dim);
}

.page-about .tl__item--now::before {
  border-color: var(--c-cyan);
  box-shadow: 0 0 0 4px rgba(47, 240, 203, 0.14);
}

.page-about .tl__year {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(42px, 9vw, 64px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--c-text);
  margin-bottom: 12px;
}

.page-about .tl__item--now .tl__year {
  color: var(--c-cyan);
}

.page-about .tl__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-muted);
  border: 1px solid var(--c-line);
  border-radius: 999px;
  padding: 3px 10px;
  margin-bottom: 12px;
}

.page-about .tl__tag--now {
  color: var(--c-orange);
  border-color: rgba(255, 138, 61, 0.45);
}

.page-about .tl__item .h3 {
  margin: 0 0 10px;
}

.page-about .tl__item p {
  max-width: 40em;
  color: var(--c-muted);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(26px, 4vw, 42px) 0 0;
}

.page-about .about-figure img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.page-about .about-figure--data {
  margin-top: clamp(30px, 5vw, 48px);
}

/* ---------- 数据体系 ---------- */
.page-about .about-data {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

@media (min-width: 820px) {
  .page-about .about-data {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-data__item {
  background: var(--c-deep);
  padding: 22px 20px 24px;
}

.page-about .about-data__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--c-orange);
  margin-bottom: 14px;
}

.page-about .about-data__item .h3 {
  margin: 0 0 8px;
}

.page-about .about-data__item p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-muted);
  margin: 0;
}

/* ---------- 团队比例条 ---------- */
.page-about .team {
  display: flex;
  flex-direction: column;
  gap: clamp(22px, 3vw, 30px);
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .team__row {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .team__meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
}

.page-about .team__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: 0.01em;
}

.page-about .team__num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--c-cyan);
  line-height: 1;
}

.page-about .team__track {
  position: relative;
  height: 10px;
  border-radius: 999px;
  background: var(--c-glass);
  border: 1px solid var(--c-line);
  overflow: hidden;
}

.page-about .team__fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  transition: filter 0.16s var(--ease);
}

.page-about .team__row:hover .team__fill {
  filter: brightness(1.15);
}

.page-about .team__fill--edit {
  width: 53%;
  background: linear-gradient(90deg, var(--c-cyan-dim), var(--c-cyan));
}

.page-about .team__fill--eng {
  width: 29%;
  background: linear-gradient(90deg, #1B8E7E, #2FF0CB);
}

.page-about .team__fill--sup {
  width: 18%;
  background: linear-gradient(90deg, #C2601F, var(--c-orange));
}

.page-about .team__desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-muted);
  max-width: 46em;
  margin: 0;
}

/* ---------- 服务信息 ---------- */
.page-about .service {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-m);
  overflow: hidden;
  margin-bottom: clamp(20px, 3vw, 28px);
}

.page-about .service__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 20px;
  background: var(--c-deep);
  padding: 15px 20px;
}

.page-about .service__k {
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--c-muted);
}

.page-about .service__v {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--c-text);
}

.page-about .about-close {
  max-width: 44em;
  color: var(--c-muted);
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__item a,
  .page-about .team__fill {
    transition: none;
  }
  .page-about .about-index__item a:hover,
  .page-about .about-index__item a:focus-visible {
    transform: none;
  }
}
</main>