.page-about {
  --ab-gap: clamp(52px, 8vw, 100px);
  --ab-pad: clamp(20px, 4vw, 34px);
  display: block;
  background: var(--bg);
  color: var(--text);
  overflow-x: clip;
}

.page-about .breadcrumb {
  margin-bottom: clamp(18px, 3vw, 30px);
}

/* ---------- 首屏：框景 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(88px, 13vw, 150px) 0 clamp(42px, 6vw, 72px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -10% -5% auto -5%;
  height: 80%;
  background:
    radial-gradient(52% 46% at 18% 12%, rgba(33, 230, 193, 0.16), transparent 70%),
    radial-gradient(46% 42% at 86% 26%, rgba(255, 138, 61, 0.13), transparent 72%);
  pointer-events: none;
}

.page-about .about-hero__frame {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: clamp(26px, 4.6vw, 54px);
  background: linear-gradient(158deg, rgba(16, 41, 61, 0.94), rgba(10, 26, 40, 0.94));
  box-shadow: var(--shadow-panel);
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  top: 0;
  left: clamp(26px, 4.6vw, 54px);
  right: clamp(26px, 4.6vw, 54px);
  height: 9px;
  background-image: repeating-linear-gradient(to right, var(--rule) 0 1px, transparent 1px 16px);
  opacity: 0.85;
}

.page-about .about-hero__tag {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  max-width: 20em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.85rem, 4vw, 3.1rem);
  line-height: 1.2;
  letter-spacing: 0.1em;
  color: var(--text-strong);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 40em;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--slate);
}

.page-about .about-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 34px 0 0;
  padding: 0;
}

.page-about .about-stats > div {
  padding: 14px 16px;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--cyan);
  border-radius: var(--r-sm);
  background: rgba(5, 16, 26, 0.55);
}

.page-about .about-stats dt {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--text-dim);
}

.page-about .about-stats dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.3rem, 2.4vw, 1.7rem);
  letter-spacing: 0.04em;
  color: var(--cyan);
}

/* ---------- 通用章节 ---------- */
.page-about .about-sec {
  position: relative;
  padding: var(--ab-gap) 0;
}

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

.page-about .about-sec .sec-head {
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.page-about .about-sec .sec-title {
  margin: 8px 0 0;
}

.page-about .about-sec .sec-note {
  margin: 8px 0 0;
}

.page-about .about-sec--band {
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(16, 41, 61, 0.62), rgba(10, 26, 40, 0.1));
}

.page-about .about-sec--band::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(to right, rgba(28, 74, 102, 0.34) 1px, transparent 1px);
  background-size: 96px 100%;
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-lede {
  max-width: 42em;
  margin: 26px 0 0;
  font-size: 0.98rem;
  line-height: 1.9;
  color: var(--slate);
}

.page-about .about-note {
  max-width: 42em;
  margin: 28px 0 0;
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--slate);
}

.page-about .about-note .mono {
  color: var(--cream);
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: 28px;
  margin-top: 28px;
}

.page-about .about-split__text p {
  margin: 0 0 16px;
  max-width: 38em;
  font-size: 0.98rem;
  line-height: 1.95;
  color: var(--slate);
}

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

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

.page-about .about-figure .frame {
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--bg-panel);
}

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

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--slate-2);
}

.page-about .about-figure--wide {
  margin-top: 34px;
}

/* ---------- 锚点胶囊 ---------- */
.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  position: relative;
  list-style: none;
  margin: 44px 0 0;
  padding: 0 0 0 30px;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: var(--r-pill);
  background: linear-gradient(to bottom, var(--cyan), rgba(28, 74, 102, 0.8) 45%, var(--amber));
  opacity: 0.85;
}

.page-about .tl::after {
  content: "";
  position: absolute;
  left: 2px;
  top: 0;
  bottom: 0;
  width: 10px;
  background-image: repeating-linear-gradient(to bottom, var(--line-soft) 0 1px, transparent 1px 15px);
  pointer-events: none;
}

.page-about .tl__item {
  position: relative;
  padding-bottom: 22px;
}

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

.page-about .tl__node {
  position: absolute;
  left: -29px;
  top: 20px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--cyan);
  background: var(--ink);
  box-shadow: 0 0 0 4px rgba(33, 230, 193, 0.14);
}

.page-about .tl__item--amber .tl__node {
  border-color: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 138, 61, 0.16);
}

.page-about .tl__item--now .tl__node {
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(33, 230, 193, 0.2);
}

.page-about .tl__year {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--slate-2);
}

.page-about .tl__card.drawer {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(16, 41, 61, 0.82);
  overflow: hidden;
  transition: border-color 240ms var(--ease-out), background 240ms var(--ease-out);
}

.page-about .tl__card.drawer[data-open="true"] {
  border-color: rgba(33, 230, 193, 0.5);
  background: rgba(20, 52, 76, 0.9);
}

.page-about .tl__card .drawer__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 14px;
  width: 100%;
  padding: 16px clamp(16px, 3vw, 22px);
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

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

.page-about .tl__card .drawer__index {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  border-bottom: 1px dashed rgba(33, 230, 193, 0.5);
  padding-bottom: 2px;
}

.page-about .tl__item--amber .tl__card .drawer__index {
  color: var(--amber);
  border-bottom-color: rgba(255, 138, 61, 0.5);
}

.page-about .tl__card .drawer__sign {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1rem, 2vw, 1.2rem);
  letter-spacing: 0.06em;
  color: var(--cream);
}

.page-about .tl__card .drawer__body {
  padding: 0 clamp(16px, 3vw, 22px) 18px;
}

.page-about .tl__card .drawer__body p {
  margin: 0;
  max-width: 44em;
  font-size: 0.94rem;
  line-height: 1.9;
  color: var(--slate);
}

/* ---------- 团队 ---------- */
.page-about .crew {
  display: grid;
  gap: 14px;
  margin-top: 30px;
}

.page-about .crew__card {
  position: relative;
  padding: var(--ab-pad);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(16, 41, 61, 0.6);
  border-left: 2px solid var(--cyan);
}

.page-about .crew__num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--slate-2);
}

.page-about .crew__card h3 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--cream);
}

.page-about .crew__card p {
  margin: 12px 0 0;
  font-size: 0.94rem;
  line-height: 1.9;
  color: var(--slate);
}

/* ---------- 四类内容 ---------- */
.page-about .lib {
  list-style: none;
  display: grid;
  gap: 14px;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .lib__item {
  display: flex;
  flex-direction: column;
  padding: var(--ab-pad);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(5, 16, 26, 0.5);
}

.page-about .lib__key {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .lib__item h3 {
  margin: 12px 0 0;
  font-family: var(--font-serif);
  font-size: 1.2rem;
  line-height: 1.4;
  color: var(--cream);
}

.page-about .lib__item p {
  margin: 12px 0 0;
  font-size: 0.93rem;
  line-height: 1.88;
  color: var(--slate);
}

.page-about .lib__link {
  margin-top: 18px;
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(33, 230, 193, 0.45);
  padding-bottom: 3px;
}

.page-about .lib__link:hover,
.page-about .lib__link:focus-visible {
  color: var(--cream);
  border-bottom-color: var(--cream);
}

/* ---------- 路径对照 ---------- */
.page-about .path-grid {
  display: grid;
  gap: 14px;
  margin-top: 30px;
}

.page-about .path-card {
  padding: var(--ab-pad);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(16, 41, 61, 0.6);
}

.page-about .path-card--win {
  border-color: rgba(255, 138, 61, 0.55);
  background: linear-gradient(152deg, rgba(255, 138, 61, 0.14), rgba(16, 41, 61, 0.72));
}

.page-about .path-card__tag {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--slate);
}

.page-about .path-card--win .path-card__tag {
  color: var(--amber);
}

.page-about .path-steps {
  list-style: none;
  counter-reset: step;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .path-steps li {
  position: relative;
  counter-increment: step;
  padding: 8px 0 8px 34px;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--cream);
  border-bottom: 1px dashed var(--line-soft);
}

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

.page-about .path-steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .path-card--win .path-steps li::before {
  color: var(--amber);
}

.page-about .path-card__foot {
  margin: 16px 0 0;
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--slate);
}

/* ---------- 结尾 ---------- */
.page-about .about-next {
  padding: 0 0 var(--ab-gap);
}

.page-about .about-next__card {
  position: relative;
  padding: clamp(28px, 5vw, 56px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(140deg, rgba(33, 230, 193, 0.12), rgba(16, 41, 61, 0.85) 55%, rgba(255, 138, 61, 0.1));
  box-shadow: var(--shadow-panel);
}

.page-about .about-next__kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-next__card h2 {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 2.8vw, 2rem);
  letter-spacing: 0.1em;
  line-height: 1.3;
  color: var(--text-strong);
}

.page-about .about-next__card > p {
  margin: 16px 0 0;
  max-width: 40em;
  font-size: 0.96rem;
  line-height: 1.9;
  color: var(--slate);
}

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

.page-about .about-next__more {
  margin-top: 20px;
  font-size: 0.9rem;
  color: var(--slate-2);
}

.page-about .about-next__more a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(33, 230, 193, 0.45);
}

.page-about .about-next__more a:hover,
.page-about .about-next__more a:focus-visible {
  color: var(--cream);
  border-bottom-color: var(--cream);
}

/* ---------- 索引区网格扩展（移动端优先） ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

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

  .page-about .path-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .tl {
    padding-left: 44px;
  }

  .page-about .tl::before {
    left: 10px;
  }

  .page-about .tl::after {
    left: 3px;
  }

  .page-about .tl__node {
    left: -43px;
  }

  .page-about .tl__card .drawer__head {
    padding: 20px 26px;
  }

  .page-about .tl__card .drawer__body {
    padding: 0 26px 22px;
  }
}

@media (min-width: 1180px) {
  .page-about .lib {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__card.drawer {
    transition: none;
  }
}