.page-about,
.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about {
  --about-gap: clamp(44px, 6.5vw, 96px);
  --about-read: 68ch;
  position: relative;
  width: 100%;
  max-width: 1180px;
  margin-inline: auto;
  padding: clamp(22px, 3.4vw, 48px) var(--pad-x) clamp(72px, 10vw, 132px);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  margin-bottom: clamp(20px, 3vw, 34px);
}

/* ---------- 开篇 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding-bottom: clamp(38px, 5.6vw, 78px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -34%;
  right: -14%;
  width: min(58%, 460px);
  aspect-ratio: 1 / 1;
  border-radius: 46% 54% 62% 38% / 52% 40% 60% 48%;
  background:
    radial-gradient(circle at 34% 32%, rgba(31, 169, 230, 0.36), rgba(53, 240, 208, 0.10) 54%, transparent 72%);
  filter: blur(8px);
  pointer-events: none;
}

.page-about .about-hero__kicker {
  display: block;
  margin: 0 0 clamp(14px, 2vw, 22px);
  color: var(--cyan);
  letter-spacing: 0.18em;
}

.page-about .about-hero__title {
  margin: 0;
  color: var(--ink-strong);
  max-width: 16em;
}

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

.page-about .about-hero__line + .about-hero__line {
  color: var(--blue);
}

.page-about .about-hero__lede {
  max-width: 44em;
  margin: clamp(20px, 2.8vw, 32px) 0 0;
  color: var(--mist);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-fact {
  padding: clamp(14px, 2vw, 22px) clamp(15px, 2vw, 24px);
  background: var(--deep-2);
}

.page-about .about-fact dt {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .about-fact dd {
  margin: 0;
  font-size: clamp(19px, 2.3vw, 25px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--ink-strong);
}

/* ---------- 章节骨架 ---------- */
.page-about .ch {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 26px);
  padding-block: var(--about-gap);
  scroll-margin-top: 88px;
}

.page-about .ch + .ch {
  border-top: 1px solid rgba(27, 58, 77, 0.6);
}

.page-about .ch__aside {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .sec-index {
  display: block;
  font-family: var(--mono);
  font-size: clamp(30px, 6vw, 54px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--blue);
  opacity: 0.4;
  transition: opacity 0.55s var(--ease), color 0.55s var(--ease);
}

.page-about .ch.is-in .sec-index {
  opacity: 1;
  color: var(--cyan);
}

.page-about .side-note {
  writing-mode: horizontal-tb;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--mist);
}

.page-about .ch__main {
  max-width: 700px;
}

.page-about .ch--wide .ch__main {
  max-width: none;
}

.page-about .ch__main .prose {
  max-width: var(--about-read);
}

.page-about .h-sec {
  margin: 0 0 clamp(14px, 2vw, 22px);
  color: var(--ink-strong);
}

.page-about .ch__main > .lede {
  max-width: 46em;
  margin: 0 0 clamp(18px, 2.6vw, 28px);
  color: var(--mist);
}

.page-about .about-fig {
  margin: clamp(26px, 3.6vw, 40px) 0 0;
}

/* ---------- 观赛人 ---------- */
.page-about .about-persona {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-persona__item {
  display: flex;
  gap: clamp(14px, 2vw, 22px);
  align-items: flex-start;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--deep-2);
  transition: background 0.28s var(--ease);
}

.page-about .about-persona__item:hover {
  background: #0E2C40;
}

.page-about .about-persona__no {
  flex: 0 0 auto;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--coral);
  padding-top: 5px;
}

.page-about .about-persona__body .h-sub {
  margin: 0 0 8px;
  color: var(--ink-strong);
}

.page-about .about-persona__body p {
  margin: 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 四条内容线 ---------- */
.page-about .about-tabs {
  margin-top: clamp(6px, 1.4vw, 14px);
}

.page-about .about-tabs .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 clamp(16px, 2.4vw, 26px);
  padding: 0;
  list-style: none;
}

.page-about .about-tabs .tabs__btn {
  appearance: none;
  -webkit-appearance: none;
  border: 1px solid var(--line);
  background: rgba(11, 37, 54, 0.62);
  color: var(--mist);
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  padding: 12px 18px;
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease),
    background 0.22s var(--ease), box-shadow 0.22s var(--ease);
}

.page-about .about-tabs .tabs__btn:hover {
  color: var(--ink-strong);
  border-color: rgba(31, 169, 230, 0.55);
}

.page-about .about-tabs .tabs__btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .about-tabs .tabs__btn[aria-selected="true"] {
  color: var(--ink-strong);
  border-color: var(--cyan);
  background: var(--glass);
  box-shadow: 0 0 0 1px rgba(53, 240, 208, 0.2), 0 14px 34px -22px rgba(53, 240, 208, 0.9);
}

.page-about .about-tabs__panel {
  padding: clamp(20px, 3vw, 34px);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background:
    linear-gradient(155deg, rgba(11, 37, 54, 0.94), rgba(6, 18, 31, 0.66));
}

.page-about .about-tabs__panel[hidden] {
  display: none;
}

.page-about .about-tabs__panel .h-sub {
  margin: 0 0 12px;
  color: var(--ink-strong);
}

.page-about .about-tabs__panel p {
  margin: 0;
  max-width: 58ch;
  color: var(--mist);
}

.page-about .about-tabs__facts {
  list-style: none;
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .about-tabs__facts li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 14px;
  color: var(--mist);
  border-bottom: 1px dashed rgba(27, 58, 77, 0.9);
  padding-bottom: 9px;
}

.page-about .about-tabs__facts .mono {
  color: var(--cyan);
  font-size: 14px;
  min-width: 4.6em;
}

.page-about .about-tabs__link {
  display: inline-block;
  margin-top: clamp(18px, 2.4vw, 26px);
  color: var(--blue);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 169, 230, 0.4);
  padding-bottom: 3px;
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-tabs__link:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 横向时间带 ---------- */
.page-about .about-tl {
  position: relative;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-tl__bg {
  position: absolute;
  inset: 0;
  margin: 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  opacity: 0.15;
  pointer-events: none;
}

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

.page-about .about-tl .tl__list {
  position: relative;
  z-index: 1;
  display: flex;
  gap: clamp(12px, 2vw, 22px);
  margin: 0;
  padding: 4px 4px 20px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-tl .tl__item {
  position: relative;
  flex: 0 0 min(80%, 296px);
  scroll-snap-align: start;
  padding: clamp(20px, 2.6vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background:
    linear-gradient(162deg, rgba(11, 37, 54, 0.95), rgba(6, 18, 31, 0.78));
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-tl .tl__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: clamp(20px, 2.6vw, 28px);
  width: 42px;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: var(--line);
  transition: width 0.4s var(--ease), background 0.4s var(--ease);
}

.page-about .about-tl .tl__item.is-in::before {
  width: 92px;
  background: var(--cyan);
}

.page-about .about-tl .tl__item.is-in:hover {
  border-color: rgba(53, 240, 208, 0.5);
  transform: translateY(-3px);
}

.page-about .about-tl .tl__time {
  display: block;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--coral);
  margin-bottom: 12px;
}

.page-about .about-tl .tl__title {
  margin: 0 0 10px;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 700;
  color: var(--ink-strong);
}

.page-about .about-tl .tl__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  margin-top: clamp(16px, 2.4vw, 26px);
}

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

.page-about .about-metrics {
  list-style: none;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
}

.page-about .about-metric {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(16px, 2.2vw, 22px);
}

.page-about .about-metric__num {
  font-size: clamp(22px, 2.8vw, 30px);
  font-weight: 700;
  color: var(--ink-strong);
  line-height: 1;
}

.page-about .about-metric__label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence {
  list-style: none;
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-cadence__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  padding: clamp(14px, 2vw, 20px) clamp(16px, 2.2vw, 24px);
  background: var(--deep-2);
}

.page-about .about-cadence__key {
  flex: 0 0 auto;
  min-width: 7.2em;
  font-size: 14px;
  color: var(--cyan);
}

.page-about .about-cadence__val {
  font-size: 14px;
  color: var(--mist);
}

.page-about .about-inline-link {
  margin: clamp(20px, 2.6vw, 28px) 0 0;
}

.page-about .about-inline-link a {
  color: var(--blue);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 169, 230, 0.4);
  padding-bottom: 3px;
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-inline-link a:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 找到我们 ---------- */
.page-about .about-contact .ch__main {
  padding: clamp(24px, 3.4vw, 40px);
  border: 1px solid rgba(53, 240, 208, 0.24);
  border-radius: var(--radius-l);
  background:
    radial-gradient(120% 140% at 8% 0%, rgba(31, 169, 230, 0.16), transparent 58%),
    linear-gradient(160deg, rgba(11, 37, 54, 0.9), rgba(6, 18, 31, 0.6));
}

.page-about .about-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 2.6vw, 28px);
}

.page-about .about-contact__note {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 52ch;
  color: var(--mist);
}

.page-about .about-contact__note a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 169, 230, 0.4);
}

.page-about .about-contact__note a:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-tabs__facts {
    grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 250px);
    align-items: start;
  }
}

@media (min-width: 860px) {
  .page-about .ch {
    grid-template-columns: minmax(78px, 108px) minmax(0, 1fr);
    column-gap: clamp(26px, 4vw, 60px);
  }

  .page-about .ch__aside {
    display: block;
    position: sticky;
    top: 92px;
    align-self: start;
  }

  .page-about .side-note {
    writing-mode: vertical-rl;
    margin-top: 16px;
    letter-spacing: 0.34em;
  }

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

@media (min-width: 1080px) {
  .page-about .ch--wide .ch__main {
    padding-right: clamp(0px, 3vw, 44px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .sec-index,
  .page-about .about-tl .tl__item,
  .page-about .about-tl .tl__item::before,
  .page-about .about-persona__item,
  .page-about .about-tabs .tabs__btn {
    transition: none;
  }

  .page-about .about-tl .tl__item.is-in:hover {
    transform: none;
  }
}