.page-about {
  --about-axis: rgba(255, 162, 58, .45);
  --about-axis-soft: rgba(255, 162, 58, .12);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(44px, 7.5vw, 100px) 0 clamp(30px, 5vw, 54px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -32%;
  right: -14%;
  width: min(700px, 86vw);
  aspect-ratio: 1;
  background: radial-gradient(circle, rgba(53, 224, 214, .16), transparent 64%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  bottom: -46%;
  left: -20%;
  width: min(560px, 72vw);
  aspect-ratio: 1;
  background: radial-gradient(circle, rgba(108, 75, 216, .18), transparent 66%);
  pointer-events: none;
}

.page-about .about-hero .eyebrow {
  color: var(--amber);
  margin: 0;
  letter-spacing: .2em;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-size: clamp(34px, 6.4vw, 74px);
  line-height: 1.04;
  font-weight: 700;
  letter-spacing: -.02em;
  max-width: 17ch;
  color: var(--paper);
}

.page-about .about-hero .lead {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(238, 241, 247, .78);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 5vw, 50px) 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .about-fact {
  background: var(--ink-2);
  padding: 16px 18px 18px;
  min-width: 0;
}

.page-about .about-fact dt {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--steel);
}

.page-about .about-fact__num {
  margin: 8px 0 0;
  font-family: var(--font-num);
  font-size: clamp(26px, 4.2vw, 40px);
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--cyan);
}

.page-about .about-fact__num span {
  font-size: .48em;
  margin-left: 3px;
  color: var(--steel);
  letter-spacing: 0;
}

/* ---------- 主体布局 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding-bottom: clamp(36px, 6vw, 60px);
}

.page-about .about-rail {
  display: none;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  min-width: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 12px;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--about-axis) 5%, var(--about-axis) 95%, transparent);
}

.page-about .about-node {
  position: relative;
  margin-left: 40px;
  margin-bottom: 32px;
  min-width: 0;
}

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

.page-about .about-node::after {
  content: "";
  position: absolute;
  top: 26px;
  left: -28px;
  width: 9px;
  height: 9px;
  background: var(--amber);
  transform: translateX(-50%) rotate(45deg);
  box-shadow: 0 0 0 5px var(--about-axis-soft);
  transition: background-color .22s ease, box-shadow .22s ease;
}

.page-about .about-node:hover::after {
  background: var(--cyan);
  box-shadow: 0 0 0 7px rgba(53, 224, 214, .14);
}

/* ---------- 画板 ---------- */
.page-about .about-panel {
  --panel-accent: var(--cyan);
  position: relative;
  min-width: 0;
  padding: clamp(20px, 3.4vw, 28px);
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.page-about .about-panel::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--panel-accent), transparent 72%);
  opacity: .62;
}

.page-about .about-panel--amber { --panel-accent: var(--amber); }
.page-about .about-panel--cyan { --panel-accent: var(--cyan); }
.page-about .about-panel--violet { --panel-accent: var(--violet); }

.page-about .about-panel p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(238, 241, 247, .78);
}

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

.page-about .about-panel a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 214, .35);
}

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

.page-about .about-panel--ivory {
  background: var(--ivory);
  border-color: rgba(11, 16, 38, .14);
  color: var(--ink);
  box-shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 22px 44px -32px rgba(0, 0, 0, .9);
}

.page-about .about-panel--receipt {
  background-image: repeating-linear-gradient(180deg, rgba(11, 16, 38, .045) 0 1px, transparent 1px 28px);
}

.page-about .about-panel--ivory p {
  color: rgba(11, 16, 38, .76);
}

.page-about .about-panel--ivory a {
  color: #9A2A4D;
  border-bottom-color: rgba(154, 42, 77, .35);
}

/* ---------- 画板标题 ---------- */
.page-about .about-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.page-about .about-head__no {
  font-family: var(--font-num);
  font-size: clamp(28px, 4.8vw, 40px);
  line-height: 1;
  letter-spacing: -.05em;
  color: rgba(238, 241, 247, .18);
}

.page-about .about-panel--ivory .about-head__no {
  color: rgba(11, 16, 38, .18);
}

.page-about .about-head .bar {
  flex: none;
  width: 3px;
  height: 30px;
  border-radius: 3px;
}

.page-about .about-head__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(21px, 3.2vw, 31px);
  line-height: 1.12;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--paper);
  min-width: 0;
}

.page-about .about-panel--ivory .about-head__title {
  color: var(--ink);
}

/* ---------- 两条线 ---------- */
.page-about .about-duo {
  display: grid;
  gap: 12px;
  margin: 18px 0;
}

.page-about .about-duo__col {
  padding: 16px 16px 18px;
  border: 1px solid var(--line);
  border-left-width: 3px;
  border-radius: var(--radius-sm);
  background: rgba(238, 241, 247, .035);
}

.page-about .about-duo__col--amber { border-left-color: var(--amber); }
.page-about .about-duo__col--cyan { border-left-color: var(--cyan); }

.page-about .about-duo__col h3 {
  margin: 10px 0 8px;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0;
  color: var(--paper);
}

.page-about .about-duo__col ul {
  margin: 0;
  padding-left: 18px;
}

.page-about .about-duo__col li {
  margin-bottom: 6px;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(238, 241, 247, .75);
}

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

.page-about .about-team__item {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: linear-gradient(158deg, rgba(108, 75, 216, .14), transparent 62%);
  min-width: 0;
}

.page-about .about-team__num {
  display: block;
  font-family: var(--font-num);
  font-size: 32px;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--violet-soft);
}

.page-about .about-team__item h3 {
  margin: 10px 0 6px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0;
  color: var(--paper);
}

.page-about .about-team__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(238, 241, 247, .72);
}

/* ---------- 版本 ---------- */
.page-about .about-ver {
  margin-top: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(11, 16, 38, .04);
  overflow: hidden;
}

.page-about .about-ver summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-ver summary::after {
  content: "";
  flex: none;
  margin-left: auto;
  width: 8px;
  height: 8px;
  border-right: 1.5px solid var(--steel);
  border-bottom: 1.5px solid var(--steel);
  transform: rotate(45deg);
  transition: transform .22s ease;
}

.page-about .about-ver[open] summary::after {
  transform: rotate(-135deg);
}

.page-about .about-ver__no {
  flex: none;
  padding: 3px 9px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--amber);
  border: 1px solid rgba(255, 162, 58, .42);
  border-radius: var(--radius-pill);
}

.page-about .about-panel--ivory .about-ver__no {
  color: #9A5016;
  border-color: rgba(154, 80, 22, .38);
}

.page-about .about-ver__name {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
  min-width: 0;
}

.page-about .about-panel--ivory .about-ver__name {
  color: var(--ink);
}

.page-about .about-ver__body {
  margin: 0;
  padding: 12px 16px 16px;
  list-style: none;
  border-top: 1px dashed rgba(238, 241, 247, .14);
}

.page-about .about-panel--ivory .about-ver__body {
  border-top-color: rgba(11, 16, 38, .16);
}

.page-about .about-ver__body li {
  position: relative;
  margin-bottom: 5px;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(238, 241, 247, .74);
}

.page-about .about-ver__body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 7px;
  height: 1px;
  background: var(--cyan);
}

.page-about .about-panel--ivory .about-ver__body li {
  color: rgba(11, 16, 38, .74);
}

/* ---------- 图片框 ---------- */
.page-about .about-figure {
  margin: 18px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--ink-3);
}

.page-about .about-panel--ivory .about-figure {
  border-color: rgba(11, 16, 38, .16);
  background: rgba(11, 16, 38, .08);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
  filter: saturate(.88) contrast(1.03) brightness(.94);
}

.page-about .about-figure--flat img { aspect-ratio: 12 / 7; }
.page-about .about-figure--cinema img { aspect-ratio: 7 / 4; }

/* ---------- 注释块 ---------- */
.page-about .about-note {
  margin: 16px 0 0;
  padding: 13px 15px;
  border: 1px dashed var(--line-2);
  border-radius: var(--radius-sm);
  font-size: 14px;
  line-height: 1.78;
  color: var(--steel);
}

.page-about .about-panel--ivory .about-note {
  border-color: rgba(11, 16, 38, .24);
  color: rgba(11, 16, 38, .62);
}

.page-about .about-note a {
  color: var(--cyan);
}

.page-about .about-panel--ivory .about-note a {
  color: #9A2A4D;
}

/* ---------- 表格 ---------- */
.page-about .about-table {
  margin-top: 16px;
}

.page-about .about-table .data-table td {
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: clamp(56px, 9vw, 96px);
  padding: clamp(20px, 3.6vw, 32px);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: linear-gradient(118deg, rgba(53, 224, 214, .11), rgba(255, 162, 58, .09) 56%, transparent);
}

.page-about .about-cta p {
  flex: 1 1 320px;
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(238, 241, 247, .8);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 108px;
    align-self: start;
    max-height: calc(100vh - 150px);
    overflow: auto;
    padding-left: 18px;
  }

  .page-about .about-rail::before {
    content: "";
    position: absolute;
    left: 0;
    top: 2px;
    bottom: 2px;
    width: 1px;
    background: linear-gradient(180deg, var(--amber), var(--violet) 48%, var(--cyan) 80%, transparent);
    opacity: .5;
  }

  .page-about .about-rail__label {
    margin: 0 0 16px;
    font-family: var(--font-num);
    font-size: 11px;
    letter-spacing: .2em;
    color: var(--steel);
  }

  .page-about .about-timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .about-node {
    width: calc(50% - 44px);
    margin-left: 0;
    margin-bottom: 52px;
  }

  .page-about .about-node:nth-child(odd) {
    margin-right: auto;
  }

  .page-about .about-node:nth-child(even) {
    margin-left: auto;
  }

  .page-about .about-node::after {
    top: 32px;
    transform: rotate(45deg);
  }

  .page-about .about-node:nth-child(odd)::after {
    left: auto;
    right: -49px;
  }

  .page-about .about-node:nth-child(even)::after {
    left: -49px;
  }
}