/* ========== 关于看台 · 页面作用域 ========== */
.page-about {
  --tl-pad: clamp(46px, 6vw, 82px);
  --rhythm: clamp(38px, 6vw, 74px);
}

.page-about .ab-hero,
.page-about .ab-arc,
.page-about .ab-team,
.page-about .ab-flow,
.page-about .ab-partners,
.page-about .ab-live,
.page-about .ab-geo {
  padding-block: clamp(44px, 6.5vw, 88px);
  position: relative;
}

/* ---------- 通用小标题 ---------- */
.page-about .sec-head {
  max-width: 62ch;
  margin-bottom: clamp(28px, 4vw, 50px);
}

.page-about .sec-kick {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .sec-head h2 {
  margin: 0 0 16px;
  font-size: clamp(26px, 4.4vw, 50px);
  line-height: 1.12;
}

.page-about .sec-sub {
  margin: 0;
  max-width: 48ch;
  color: var(--muted);
  font-size: var(--fs-5);
  line-height: 1.85;
}

/* ================= 首屏 ================= */
.page-about .ab-hero {
  padding-top: clamp(18px, 3vw, 34px);
  padding-bottom: clamp(46px, 7vw, 96px);
  overflow: hidden;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: -6%;
  right: -6%;
  bottom: -60px;
  height: 150px;
  background: linear-gradient(180deg, transparent, rgba(31, 111, 235, 0.12));
  transform: skewY(var(--skew));
  transform-origin: left bottom;
  pointer-events: none;
  z-index: 0;
}

.page-about .hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 56px);
  margin-top: clamp(22px, 3.6vw, 44px);
}

@media (min-width: 1040px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(40px, 5vw, 88px);
    align-items: start;
  }
}

.page-about .hero-kick {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-about .hero-h1 {
  margin: 0 0 clamp(18px, 2.6vw, 30px);
  max-width: 20ch;
  font-size: clamp(32px, 6.4vw, 76px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.page-about .hero-h1 em {
  font-style: normal;
  display: inline-block;
  padding: 0 0.14em;
  background: var(--blue);
  color: #fff;
  border-radius: var(--radius);
}

.page-about .hero-lead {
  margin: 0 0 14px;
  max-width: 56ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.8;
  color: var(--ink);
}

.page-about .hero-lead--sub {
  margin-bottom: 0;
  font-size: var(--fs-5);
  color: var(--muted);
}

.page-about .hero-acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 34px);
}

/* 右侧竖排旁注 */
.page-about .about-note {
  display: none;
}

@media (min-width: 1040px) {
  .page-about .about-note {
    display: flex;
    flex-direction: row;
    justify-content: flex-end;
    gap: 18px;
    position: sticky;
    top: 150px;
    padding-right: 4px;
  }

  .page-about .note-line {
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.2em;
    color: var(--muted);
    white-space: nowrap;
    border-right: 1px solid var(--line);
    padding-right: 14px;
  }

  .page-about .note-line:first-child {
    color: var(--lime);
    border-right-color: rgba(183, 255, 60, 0.4);
  }
}

/* ================= 纵向年表 ================= */
.page-about .ab-arc {
  background: linear-gradient(180deg, transparent, rgba(23, 27, 34, 0.72) 10%, rgba(23, 27, 34, 0.72) 90%, transparent);
}

.page-about .tl {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  row-gap: var(--rhythm);
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--blue) 0%, var(--blue-deep) 45%, var(--line) 100%);
}

.page-about .tl-node {
  position: relative;
  overflow: hidden;
  padding-left: var(--tl-pad);
  min-width: 0;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 12px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--blue);
  box-shadow: 0 0 0 5px rgba(31, 111, 235, 0.14);
  z-index: 2;
}

.page-about .tl-year {
  position: absolute;
  right: 0;
  top: -0.16em;
  font-family: var(--font-mono);
  font-size: clamp(56px, 13vw, 148px);
  font-weight: 700;
  line-height: 0.82;
  letter-spacing: -0.05em;
  color: rgba(31, 111, 235, 0.08);
  -webkit-text-stroke: 1px rgba(31, 111, 235, 0.3);
  pointer-events: none;
  user-select: none;
  z-index: 0;
}

.page-about .tl-head {
  position: relative;
  z-index: 2;
  display: block;
  width: 100%;
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
  text-align: left;
  color: inherit;
  font: inherit;
  cursor: pointer;
}

.page-about .tl-head:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 6px;
}

.page-about .tl-k {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 10px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--lime);
  border: 1px solid rgba(183, 255, 60, 0.35);
  border-radius: 999px;
  transition: background var(--t-in) var(--ease);
}

.page-about .tl-head:hover .tl-k {
  background: rgba(183, 255, 60, 0.12);
}

.page-about .tl-t {
  display: block;
  max-width: 22ch;
  font-size: clamp(21px, 3vw, 32px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--ink);
  transition: color var(--t-in) var(--ease);
}

.page-about .tl-head:hover .tl-t {
  color: var(--orange);
}

.page-about .tl-body {
  position: relative;
  z-index: 2;
  margin-top: 14px;
  max-width: 60ch;
  font-size: var(--fs-5);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .tl-body p {
  margin: 0;
}

.page-about .tl-fig {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  max-width: 520px;
}

/* 横向数据带 */
.page-about .tl-band {
  position: relative;
  margin-left: calc(-1 * var(--tl-pad));
  padding: clamp(22px, 3vw, 34px) clamp(18px, 3vw, 34px);
  background: linear-gradient(100deg, rgba(31, 111, 235, 0.2), rgba(124, 77, 255, 0.1) 58%, transparent);
  border-left: 3px solid var(--orange);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about .band-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: clamp(18px, 3vw, 36px);
}

.page-about .band-i {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .band-n {
  font-size: clamp(30px, 4.6vw, 52px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--lime);
}

.page-about .band-n small {
  margin-left: 3px;
  font-size: 0.4em;
  color: var(--ink);
}

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

/* ================= 团队与分工 ================= */
.page-about .team-fig {
  margin: 0 0 clamp(26px, 4vw, 48px);
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 26px);
}

@media (min-width: 860px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .role {
  display: flex;
  flex-direction: column;
  padding: clamp(20px, 2.6vw, 28px);
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color var(--t-in) var(--ease), transform var(--t-in) var(--ease);
}

.page-about .role:hover,
.page-about .role:focus-within {
  border-color: var(--blue);
  transform: translateY(-3px);
}

.page-about .role-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 14px;
}

.page-about .role-n {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .role-t {
  margin: 0;
  font-size: var(--fs-4);
  font-weight: 800;
  color: var(--ink);
}

.page-about .role-bar {
  height: 6px;
  margin-bottom: 16px;
  background: var(--line);
  border-radius: 999px;
  overflow: hidden;
}

.page-about .role-bar i {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--blue), var(--violet));
}

.page-about .role--data .role-bar i { width: 100%; }
.page-about .role--field .role-bar i { width: 67%; }
.page-about .role--audit .role-bar i { width: 50%; }

.page-about .role p {
  margin: 0;
  font-size: var(--fs-5);
  line-height: 1.8;
  color: var(--muted);
}

/* ================= 内容节奏 ================= */
.page-about .cadence {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .cadence-i {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: clamp(18px, 2.4vw, 26px) clamp(10px, 1.6vw, 18px);
  border-bottom: 1px solid var(--line);
  transition: background var(--t-in) var(--ease);
}

.page-about .cadence-i:hover {
  background: rgba(31, 111, 235, 0.07);
}

@media (min-width: 760px) {
  .page-about .cadence-i {
    grid-template-columns: minmax(160px, 220px) minmax(0, 1fr);
    gap: clamp(20px, 4vw, 56px);
    align-items: baseline;
  }
}

.page-about .cd-when {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--lime);
}

.page-about .cd-what {
  font-size: var(--fs-5);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .flow-link {
  margin: clamp(22px, 3vw, 32px) 0 0;
  font-size: var(--fs-5);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .flow-link a,
.page-about .part-link a {
  color: var(--orange);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .flow-link a:hover,
.page-about .part-link a:hover {
  color: var(--lime);
}

/* ================= 合作生态 ================= */
.page-about .partner-rail {
  display: flex;
  gap: clamp(14px, 2vw, 22px);
  overflow-x: auto;
  padding-bottom: 14px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .partner {
  flex: 0 0 clamp(226px, 26vw, 300px);
  scroll-snap-align: start;
  min-width: 0;
  padding: clamp(20px, 2.6vw, 28px);
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-top: 3px solid var(--violet);
  border-radius: var(--radius);
  transition: transform var(--t-in) var(--ease);
}

.page-about .partner:hover {
  transform: translateY(-4px);
}

.page-about .partner:nth-child(2) { border-top-color: var(--blue); }
.page-about .partner:nth-child(3) { border-top-color: var(--lime); }
.page-about .partner:nth-child(4) { border-top-color: var(--orange); }

.page-about .p-n {
  display: block;
  margin-bottom: 10px;
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  line-height: 1;
  color: var(--violet);
}

.page-about .partner:nth-child(2) .p-n { color: var(--blue); }
.page-about .partner:nth-child(3) .p-n { color: var(--lime); }
.page-about .partner:nth-child(4) .p-n { color: var(--orange); }

.page-about .p-t {
  margin: 0 0 10px;
  font-size: var(--fs-4);
  font-weight: 800;
  color: var(--ink);
}

.page-about .partner p {
  margin: 0;
  font-size: var(--fs-5);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .part-link {
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  font-size: var(--fs-5);
  color: var(--muted);
}

/* ================= 线下看台 ================= */
.page-about .live-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 56px);
  align-items: center;
}

@media (min-width: 940px) {
  .page-about .live-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

.page-about .live-lead {
  margin: 0 0 16px;
  max-width: 52ch;
  font-size: var(--fs-5);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .live-facts {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 3vw, 40px);
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .live-facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
}

.page-about .live-facts .mono {
  font-size: clamp(24px, 2.6vw, 32px);
  font-weight: 700;
  color: var(--ink);
}

.page-about .live-fig {
  margin: 0;
}

/* ================= 数据与地域 ================= */
.page-about .geo-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.2vw, 24px);
}

@media (min-width: 860px) {
  .page-about .geo-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .geo-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(20px, 2.6vw, 30px);
  background: rgba(31, 111, 235, 0.07);
  border: 1px solid var(--line);
  border-left: 3px solid var(--blue);
  border-radius: var(--radius);
}

.page-about .geo-card h3 {
  margin: 0;
  font-size: var(--fs-4);
  font-weight: 800;
  color: var(--ink);
}

.page-about .geo-card p {
  flex: 1 1 auto;
  margin: 0;
  font-size: var(--fs-5);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .geo-card .btn {
  align-self: flex-start;
}

/* ================= 结尾行动区 ================= */
.page-about .ab-cta {
  padding-block: clamp(40px, 6vw, 84px);
}

.page-about .cta-box {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 4.4vw, 56px);
  background: linear-gradient(115deg, rgba(31, 111, 235, 0.3), rgba(11, 60, 140, 0.16) 48%, rgba(255, 107, 26, 0.16));
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .cta-box::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -8%;
  width: min(380px, 60vw);
  height: min(380px, 60vw);
  background: radial-gradient(circle, rgba(183, 255, 60, 0.22), transparent 65%);
  pointer-events: none;
}

.page-about .cta-k {
  position: relative;
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--lime);
}

.page-about .cta-h {
  position: relative;
  margin: 0 0 24px;
  max-width: 24ch;
  font-size: clamp(24px, 4vw, 46px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .cta-acts {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ================= 窄屏保护 ================= */
@media (max-width: 560px) {
  .page-about {
    --tl-pad: 42px;
  }

  .page-about .tl::before {
    left: 12px;
  }

  .page-about .tl-node::before {
    left: 5px;
    width: 14px;
    height: 14px;
  }

  .page-about .hero-h1 {
    max-width: none;
  }

  .page-about .partner {
    flex: 0 0 82%;
  }

  .page-about .tl-band {
    border-radius: 0;
  }
}