/* ============================================================
   page-about : 平台介绍
   ============================================================ */

.page-about {
  --ab-axis-x: 15px;
  --ab-pad: 44px;
  --ab-paper-ink: #3D4A70;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding: clamp(14px, 2.5vw, 24px) 0 0;
}
.page-about .about-crumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.page-about .about-crumb li {
  display: flex;
  align-items: center;
}
.page-about .about-crumb li + li::before {
  content: "／";
  margin: 0 8px;
  color: var(--line);
}
.page-about .about-crumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease;
}
.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
}
.page-about .about-crumb li[aria-current] {
  color: var(--star);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  margin-top: clamp(18px, 2.5vw, 32px);
  padding: clamp(40px, 7vw, 96px) 0 clamp(44px, 7vw, 100px);
  background: var(--ink);
  border-top: var(--bd) solid var(--line);
  border-bottom: var(--bd) solid var(--line);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.4;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(105deg, #000 0%, rgba(0, 0, 0, 0.2) 60%, transparent 100%);
  mask-image: linear-gradient(105deg, #000 0%, rgba(0, 0, 0, 0.2) 60%, transparent 100%);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  top: -24%;
  width: 64%;
  height: 148%;
  background: linear-gradient(135deg, rgba(123, 92, 255, 0.34), rgba(67, 224, 200, 0.06));
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}
.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}
.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 20ch;
  font-family: var(--font-narrow);
  font-size: clamp(30px, 6.2vw, 74px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--star);
}
.page-about .about-hero__lead {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 60ch;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--muted);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(28px, 4.5vw, 48px) 0 0;
  padding: var(--bd);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--bd);
  max-width: 760px;
  background: var(--line);
  border: var(--bd) solid var(--line);
}
.page-about .about-hero__facts li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  padding: 16px 18px;
  background: var(--ink-2);
}
.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
}
.page-about .about-fact__unit {
  font-size: 16px;
  margin-left: 2px;
}
.page-about .about-fact__label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 通用段落 ---------- */
.page-about .about-section {
  position: relative;
  padding: clamp(48px, 7.5vw, 112px) 0;
}
.page-about .about-section--timeline,
.page-about .about-section--team,
.page-about .about-section--reach,
.page-about .about-section--eco {
  border-top: var(--bd) solid var(--line);
}
.page-about .about-h2 {
  margin: 10px 0 0;
  max-width: 26ch;
  font-family: var(--font-narrow);
  font-size: clamp(24px, 3.6vw, 44px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.005em;
  color: var(--star);
}
.page-about .about-lead {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--muted);
}
.page-about .about-body {
  margin-top: 22px;
  max-width: 62ch;
}
.page-about .about-body p {
  margin: 0 0 16px;
  font-size: 17px;
  line-height: 1.88;
  color: var(--star);
}
.page-about .about-body p:last-child {
  margin-bottom: 0;
}

/* ---------- 非对称双栏（01 品牌坐标） ---------- */
.page-about .about-grid-7-5 {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
}
.page-about .about-col-main {
  min-width: 0;
}
.page-about .about-col-side {
  min-width: 0;
}
.page-about .coord-card {
  border: var(--bd) solid var(--line);
  background: var(--ink-2);
  box-shadow: 8px 8px 0 var(--ink);
  padding: 22px 20px 24px;
}
.page-about .coord-card__idx {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}
.page-about .coord-card__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .coord-card__list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--star);
}
.page-about .coord-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 9px;
  height: 2px;
  background: var(--gold);
}
.page-about .coord-card__link {
  display: inline-block;
  margin-top: 20px;
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--gold);
  text-decoration: none;
  border-bottom: var(--bd) solid transparent;
  transition: border-color 0.16s ease;
}
.page-about .coord-card__link:hover,
.page-about .coord-card__link:focus-visible {
  border-bottom-color: var(--gold);
}

/* ---------- 图片容器 ---------- */
.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}
.page-about .about-figure {
  margin: clamp(28px, 4vw, 44px) 0 0;
  border: var(--bd) solid var(--line);
  background: var(--ink-2);
  box-shadow: 10px 10px 0 var(--ink);
  overflow: hidden;
}
.page-about .about-figure img {
  width: 100%;
  object-fit: cover;
}
.page-about .about-figure figcaption {
  padding: 12px 16px 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  position: relative;
  list-style: none;
  margin: clamp(34px, 5vw, 56px) 0 0;
  padding: 0 0 0 var(--ab-pad);
}
.page-about .tl::before {
  content: "";
  position: absolute;
  left: var(--ab-axis-x);
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--violet) 46%, var(--cyan) 100%);
  opacity: 0.9;
}
.page-about .tl__item {
  position: relative;
  padding-bottom: clamp(28px, 3.6vw, 44px);
}
.page-about .tl__item:last-child {
  padding-bottom: 0;
}
.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -36px;
  top: 5px;
  width: 16px;
  height: 16px;
  background: var(--ink);
  border: var(--bd) solid var(--gold);
  transition: background-color 0.18s ease, transform 0.18s ease, border-color 0.18s ease;
}
.page-about .tl__item:hover::before,
.page-about .tl__item:focus-within::before {
  background: var(--gold);
  border-color: var(--star);
  transform: scale(1.15);
}
.page-about .tl__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--gold);
}
.page-about .tl__title {
  margin: 8px 0 0;
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--star);
}
.page-about .tl__desc {
  margin: 10px 0 0;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 浅色纸面区 ---------- */
.page-about .about-paper {
  background: var(--paper);
  color: var(--ink);
}
.page-about .about-paper .about-h2 {
  color: var(--ink);
}
.page-about .about-paper .about-lead {
  color: var(--ab-paper-ink);
}
.page-about .about-paper .eyebrow {
  color: var(--violet-deep);
}

/* ---------- 服务体系四象限 ---------- */
.page-about .svc-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: clamp(30px, 4vw, 46px);
}
.page-about .svc-cell {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px 20px 24px;
  background: var(--star);
  border: var(--bd) solid var(--ink);
  box-shadow: 6px 6px 0 rgba(42, 58, 107, 0.22);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.page-about .svc-cell:hover,
.page-about .svc-cell:focus-within {
  transform: translate(-2px, -2px);
  box-shadow: 10px 10px 0 rgba(42, 58, 107, 0.3);
}
.page-about .svc-cell__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--violet-deep);
}
.page-about .svc-cell h3 {
  margin: 0;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 800;
  line-height: 1.45;
  color: var(--ink);
}
.page-about .svc-cell p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ab-paper-ink);
}
.page-about .svc-cell__link {
  align-self: flex-start;
  margin-top: auto;
  padding-top: 8px;
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--violet-deep);
  text-decoration: none;
  border-bottom: var(--bd) solid transparent;
  transition: border-color 0.16s ease;
}
.page-about .svc-cell__link:hover,
.page-about .svc-cell__link:focus-visible {
  border-bottom-color: var(--violet-deep);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 4.5vw, 56px);
  margin-top: clamp(26px, 3.5vw, 40px);
}
.page-about .team-col {
  min-width: 0;
}
.page-about .team-col .about-lead {
  margin-top: 0;
}
.page-about .team-rows {
  margin: clamp(26px, 3.6vw, 40px) 0 0;
  padding: 0;
  display: grid;
  border-top: var(--bd) solid var(--line);
}
.page-about .team-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.page-about .team-row dt {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--star);
}
.page-about .team-row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .team-row dd.team-row__num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--cyan);
}
.page-about .team-figure {
  margin: 0;
  border: var(--bd) solid var(--line);
  background: var(--ink-2);
  box-shadow: 10px 10px 0 var(--ink);
  overflow: hidden;
}
.page-about .team-figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .team-figure figcaption {
  padding: 12px 16px 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

/* ---------- 覆盖范围与数据 ---------- */
.page-about .about-figure--reach {
  margin-top: clamp(28px, 4vw, 44px);
}
.page-about .stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: clamp(26px, 3.6vw, 40px);
}
.page-about .stat-card {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  padding: 20px 18px 22px;
  background: var(--ink-2);
  border: var(--bd) solid var(--line);
  box-shadow: 6px 6px 0 var(--ink);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.page-about .stat-card:hover {
  transform: translate(-2px, -2px);
  border-color: var(--gold);
  box-shadow: 10px 10px 0 var(--ink);
}
.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 5vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
  word-break: keep-all;
}
.page-about .stat-unit {
  font-size: 0.52em;
  margin-left: 2px;
  letter-spacing: 0;
}
.page-about .stat-label {
  display: block;
  margin-top: 12px;
  font-size: 13.5px;
  line-height: 1.65;
  letter-spacing: 0.03em;
  color: var(--muted);
}

/* ---------- 合作生态 ---------- */
.page-about .eco-list {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.page-about .eco-item {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--ink-2);
  border: var(--bd) solid var(--line);
  box-shadow: 6px 6px 0 var(--ink);
}
.page-about .eco-item__idx {
  display: inline-block;
  margin-bottom: 12px;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ink);
  background: var(--cyan);
}
.page-about .eco-item h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.45;
  color: var(--star);
}
.page-about .eco-item p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}
.page-about .honor {
  margin-top: clamp(28px, 4vw, 44px);
  padding: 22px 20px 24px;
  border: var(--bd) solid var(--gold);
  background: transparent;
}
.page-about .honor__title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--gold);
}
.page-about .honor__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .honor__list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--star);
}
.page-about .honor__mark {
  flex: none;
  width: 12px;
  height: 12px;
  margin-top: 8px;
  background: var(--gold);
  transform: rotate(45deg);
}

/* ---------- 服务承诺 ---------- */
.page-about .promise-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: clamp(28px, 4vw, 44px);
}
.page-about .promise-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px 20px 26px;
  background: var(--star);
  border: var(--bd) solid var(--ink);
  box-shadow: 6px 6px 0 rgba(42, 58, 107, 0.22);
}
.page-about .promise-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.6vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.page-about .promise-num__dash {
  margin: 0 2px;
  color: var(--violet-deep);
}
.page-about .promise-unit {
  font-size: 0.5em;
  margin-left: 3px;
  color: var(--violet-deep);
}
.page-about .promise-label {
  font-size: 13.5px;
  line-height: 1.65;
  letter-spacing: 0.04em;
  color: var(--ab-paper-ink);
}
.page-about .promise-note {
  margin-top: clamp(26px, 3.6vw, 40px);
  padding-left: 18px;
  border-left: var(--bd) solid var(--violet-deep);
}
.page-about .promise-note__title {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 800;
  color: var(--ink);
}
.page-about .promise-note p {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.88;
  color: var(--ab-paper-ink);
}
.page-about .promise-cta {
  margin-top: clamp(30px, 4.5vw, 52px);
  padding-top: clamp(26px, 3.5vw, 38px);
  border-top: var(--bd) solid rgba(42, 58, 107, 0.35);
  display: grid;
  gap: 22px;
}
.page-about .promise-cta__text {
  margin: 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
}
.page-about .promise-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .svc-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
  .page-about .stat-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
  .page-about .eco-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .promise-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .team-row {
    grid-template-columns: 160px 84px minmax(0, 1fr);
    align-items: baseline;
    gap: 4px 20px;
  }
  .page-about .team-row dt {
    grid-column: 1;
  }
  .page-about .team-row dd.team-row__num {
    grid-column: 2;
  }
  .page-about .team-row dd:last-child {
    grid-column: 3;
  }
}

@media (min-width: 900px) {
  .page-about {
    --ab-pad: 132px;
    --ab-axis-x: 103px;
  }
  .page-about .about-grid-7-5 {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }
  .page-about .team-grid {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }
  .page-about .about-hero__title {
    max-width: 18ch;
  }
  .page-about .tl__item {
    padding-bottom: 52px;
  }
  .page-about .promise-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
  .page-about .promise-cta__actions {
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__item::before,
  .page-about .svc-cell,
  .page-about .stat-card {
    transition: none;
  }
  .page-about .tl__item:hover::before,
  .page-about .tl__item:focus-within::before,
  .page-about .svc-cell:hover,
  .page-about .svc-cell:focus-within,
  .page-about .stat-card:hover {
    transform: none;
  }
}