.page-about {
  --ab-index-w: 218px;
  --ab-gap: clamp(28px, 4.6vw, 78px);
  --ab-body: rgba(232, 244, 240, .86);
  background: var(--ink);
  color: var(--text);
}

.page-about .hl {
  color: var(--lemon);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(40px, 6.6vw, 100px) 0 clamp(34px, 4.6vw, 66px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -8% auto -8%;
  height: 165%;
  z-index: -1;
  pointer-events: none;
  background:
    linear-gradient(114deg, rgba(18, 214, 184, .20) 0%, rgba(18, 214, 184, 0) 44%),
    linear-gradient(296deg, rgba(255, 138, 61, .15) 0%, rgba(255, 138, 61, 0) 38%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -6vw;
  top: 8%;
  width: min(48vw, 540px);
  aspect-ratio: 1 / 1;
  z-index: -1;
  pointer-events: none;
  clip-path: polygon(0 0, 100% 13%, 100% 100%, 0 87%);
  background: repeating-linear-gradient(
    115deg,
    rgba(18, 214, 184, .10) 0 2px,
    transparent 2px 20px
  );
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(14px, 1.8vw, 22px);
  max-width: 1020px;
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(36px, 7vw, 92px);
  line-height: 1.02;
  letter-spacing: .045em;
  color: var(--text);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 40em;
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.85;
  color: var(--ab-body);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: clamp(8px, 1.4vw, 16px) 0 0;
  padding: 14px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
  font-size: 14px;
  color: var(--muted);
}

.page-about .about-hero__meta li {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .about-hero__meta .data-num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--lemon);
  letter-spacing: .02em;
}

/* ---------- 画布与栏目索引 ---------- */

.page-about .about-canvas {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 44px);
  padding-top: clamp(34px, 4.8vw, 66px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-index ul {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-width: none;
}

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

.page-about .about-index a {
  display: block;
  white-space: nowrap;
  padding: 8px 14px;
  font-size: 14px;
  color: var(--text);
  text-decoration: none;
  border: 1px solid var(--line);
  clip-path: polygon(9px 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%, 0 9px);
  transition: color .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--accent);
  border-color: var(--line-2);
  background: rgba(18, 214, 184, .08);
}

/* ---------- 区块基础 ---------- */

.page-about .ab-block {
  position: relative;
  padding: clamp(32px, 5vw, 68px) 0;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 28px);
}

.page-about .ab-block:last-of-type {
  border-bottom: 0;
}

.page-about .ab-block__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 3.6vw, 44px);
  line-height: 1.08;
  letter-spacing: .05em;
  color: var(--text);
}

.page-about .ab-lede {
  margin: 0 0 clamp(20px, 2.6vw, 30px);
  max-width: 42em;
  font-size: clamp(15.5px, 1.5vw, 18px);
  line-height: 1.85;
  color: var(--ab-body);
}

.page-about .ab-block p {
  max-width: 42em;
  line-height: 1.85;
  color: var(--ab-body);
}

.page-about .ab-block a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--line-2);
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .ab-block a:hover,
.page-about .ab-block a:focus-visible {
  color: var(--lemon);
  border-bottom-color: var(--lemon);
}

/* ---------- 双业务线 ---------- */

.page-about .ab-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 42px);
}

.page-about .ab-lane {
  padding-left: clamp(16px, 2vw, 24px);
  border-left: 2px solid var(--cyan);
}

.page-about .ab-lane--b {
  border-left-color: var(--grass);
}

.page-about .ab-lane h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(20px, 2.2vw, 26px);
  letter-spacing: .05em;
  color: var(--text);
}

.page-about .ab-lane p {
  margin: 0;
  font-size: 15.5px;
}

.page-about .ab-list {
  display: grid;
  gap: 12px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-list li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ab-body);
}

.page-about .ab-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 11px;
  height: 2px;
  background: var(--accent);
}

/* ---------- 引文分隔 ---------- */

.page-about .ab-pullquote {
  position: relative;
  margin: clamp(44px, 7vw, 96px) 0;
  padding-left: clamp(18px, 3vw, 42px);
  max-width: 24em;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(23px, 4.2vw, 52px);
  line-height: 1.18;
  letter-spacing: .04em;
  color: var(--lemon);
}

.page-about .ab-pullquote::before {
  content: "";
  position: absolute;
  left: 0;
  top: .12em;
  bottom: .12em;
  width: 6px;
  clip-path: polygon(0 0, 100% 5%, 100% 100%, 0 95%);
  background: linear-gradient(165deg, var(--amber), var(--cyan));
}

/* ---------- 团队 ---------- */

.page-about .ab-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 46px);
  align-items: start;
}

.page-about .ab-team__roles {
  display: grid;
  gap: 12px;
}

.page-about .ab-role {
  position: relative;
  padding: clamp(16px, 2.2vw, 24px) clamp(16px, 2.2vw, 24px) clamp(16px, 2.2vw, 24px) clamp(20px, 2.6vw, 30px);
  border-left: 3px solid var(--cyan);
  background: linear-gradient(100deg, rgba(18, 214, 184, .13), rgba(18, 214, 184, 0) 72%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  transition: transform .3s var(--ease), background .3s var(--ease);
}

.page-about .ab-role--grass {
  border-left-color: var(--grass);
  background: linear-gradient(100deg, rgba(47, 191, 107, .13), rgba(47, 191, 107, 0) 72%);
}

.page-about .ab-role--amber {
  border-left-color: var(--amber);
  background: linear-gradient(100deg, rgba(255, 138, 61, .13), rgba(255, 138, 61, 0) 72%);
}

.page-about .ab-role:hover {
  transform: translateX(5px);
}

.page-about .ab-role__num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 3.4vw, 40px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--lemon);
}

.page-about .ab-role__name {
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(19px, 2vw, 24px);
  letter-spacing: .06em;
  color: var(--text);
}

.page-about .ab-role__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ab-body);
}

.page-about .ab-team__figure {
  margin: 0;
}

/* ---------- 时间线 ---------- */

.page-about .ab-timeline {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-timeline li {
  position: relative;
  padding: 0 0 clamp(20px, 3vw, 34px) clamp(30px, 4vw, 42px);
}

.page-about .ab-timeline li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 11px;
  height: 11px;
  background: var(--ink);
  border: 2px solid var(--amber);
  transform: rotate(45deg);
  z-index: 1;
}

.page-about .ab-timeline li::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 22px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, rgba(255, 138, 61, .8), rgba(255, 138, 61, .10));
}

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

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

.page-about .ab-tl__time {
  display: inline-block;
  margin-bottom: 10px;
  padding: 2px 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--amber);
  border: 1px solid rgba(255, 138, 61, .5);
}

.page-about .ab-tl__body h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(18px, 2vw, 23px);
  letter-spacing: .05em;
  color: var(--text);
}

.page-about .ab-tl__body p {
  margin: 0;
  font-size: 15.5px;
}

/* ---------- 场馆 ---------- */

.page-about .ab-venue {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 46px);
  align-items: start;
}

.page-about .ab-venue__figure {
  margin: 0;
}

.page-about .ab-venue__body p {
  margin: 0 0 16px;
  font-size: 15.5px;
}

.page-about .ab-layers {
  display: grid;
  gap: 10px;
  margin: 22px 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-layers li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 12px 14px;
  background: rgba(15, 58, 46, .55);
  border-left: 2px solid var(--grass);
}

.page-about .ab-layer__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--grass-soft);
}

.page-about .ab-layer__text {
  font-size: 15px;
  line-height: 1.7;
  color: var(--ab-body);
}

/* ---------- 跨场景 ---------- */

.page-about .ab-bridge {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  margin: clamp(34px, 5.4vw, 78px) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-bridge__bg {
  position: absolute;
  inset: 0;
  margin: 0;
  z-index: -1;
}

.page-about .ab-bridge__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .36;
}

.page-about .ab-bridge__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(104deg, rgba(6, 17, 14, .95) 6%, rgba(6, 17, 14, .74) 54%, rgba(10, 31, 26, .52) 100%);
}

.page-about .ab-bridge__inner {
  padding: clamp(32px, 4.8vw, 70px) 0;
}

.page-about .ab-bridge__inner p {
  margin: 0;
  max-width: 42em;
  font-size: clamp(15.5px, 1.5vw, 17.5px);
  line-height: 1.85;
  color: var(--ab-body);
}

.page-about .ab-bridge__facts {
  display: grid;
  gap: 10px;
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-bridge__facts li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 11px 14px;
  font-size: 15px;
  color: var(--ab-body);
  background: rgba(18, 214, 184, .08);
  border-left: 2px solid var(--accent);
}

.page-about .ab-bridge__facts strong {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  color: var(--lemon);
  letter-spacing: .02em;
}

/* ---------- 合作 ---------- */

.page-about .ab-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 22px);
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .ab-partner {
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--panel);
}

.page-about .ab-partner h3 {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(18px, 2vw, 23px);
  letter-spacing: .05em;
  color: var(--text);
}

.page-about .ab-partner p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
}

/* ---------- 收尾 ---------- */

.page-about .ab-cta {
  display: grid;
  gap: clamp(16px, 2.2vw, 24px);
  margin-top: clamp(34px, 4.6vw, 62px);
  padding: clamp(24px, 3.4vw, 46px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
  background:
    linear-gradient(112deg, rgba(18, 214, 184, .16) 0%, rgba(18, 214, 184, 0) 52%),
    linear-gradient(300deg, rgba(255, 138, 61, .14) 0%, rgba(255, 138, 61, 0) 46%),
    var(--ink-2);
  border: 1px solid var(--line);
}

.page-about .ab-cta__text {
  margin: 0;
  max-width: 34em;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(20px, 2.6vw, 30px);
  line-height: 1.35;
  letter-spacing: .045em;
  color: var(--text);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */

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

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

@media (min-width: 900px) {
  .page-about .ab-venue {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
  }
}

@media (min-width: 960px) {
  .page-about .ab-team {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr);
  }
}

@media (min-width: 920px) {
  .page-about .about-canvas {
    grid-template-columns: var(--ab-index-w) minmax(0, 1fr);
    gap: var(--ab-gap);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 30px);
    align-self: start;
    padding-left: 18px;
    border-left: 1px solid var(--line);
  }

  .page-about .about-index ul {
    flex-direction: column;
    gap: 0;
    padding: 0;
    overflow: visible;
  }

  .page-about .about-index a {
    padding: 9px 0;
    border: 0;
    border-bottom: 1px solid transparent;
    clip-path: none;
    font-family: var(--font-display);
    font-size: 17px;
    letter-spacing: .05em;
    color: var(--muted);
    transition: color .25s var(--ease), padding-left .25s var(--ease), border-color .25s var(--ease);
  }

  .page-about .about-index a:hover,
  .page-about .about-index a:focus-visible {
    color: var(--accent);
    background: transparent;
    padding-left: 6px;
    border-bottom-color: var(--line);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-role,
  .page-about .about-index a {
    transition: none;
  }

  .page-about .ab-role:hover {
    transform: none;
  }
}