/* ============ 俱乐部档案 /team/ ============ */
.page-about {
  --about-rail-w: 300px;
  background: var(--paper);
  color: var(--paper-ink);
  overflow-x: hidden;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: calc(var(--header-h) + clamp(22px, 4vw, 50px));
  padding-bottom: clamp(28px, 5vw, 54px);
  background:
    radial-gradient(120% 90% at 88% -12%, rgba(53, 224, 214, 0.14), transparent 62%),
    linear-gradient(180deg, rgba(18, 41, 63, 0.05), transparent 58%);
  border-bottom: 1px solid var(--paper-line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(27, 31, 36, 0.045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(27, 31, 36, 0.045) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, #000, transparent 76%);
  mask-image: linear-gradient(180deg, #000, transparent 76%);
}

.page-about .about-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb {
  font-size: 13px;
  color: rgba(27, 31, 36, 0.6);
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .breadcrumb li {
  position: relative;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  position: absolute;
  left: -12px;
  color: rgba(27, 31, 36, 0.32);
}

.page-about .breadcrumb a {
  color: var(--cyan-deep);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  border-bottom-color: var(--cyan-deep);
}

.page-about .eyebrow {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--orange-deep);
  margin: 0;
}

.page-about h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 6.4vw, 72px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 12px 0 0;
  max-width: 20ch;
  color: var(--paper-ink);
}

.page-about .about-lede {
  font-size: clamp(16px, 2.2vw, 18px);
  line-height: 1.78;
  color: rgba(27, 31, 36, 0.82);
  max-width: 40em;
  margin: clamp(16px, 2.6vw, 26px) 0 0;
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--paper-line);
  border: 1px solid var(--paper-line);
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-figures .data-figure {
  display: flex;
  flex-direction: column;
  background: rgba(255, 255, 255, 0.4);
  padding: 15px 16px;
}

.page-about .data-figure-value {
  display: flex;
  align-items: baseline;
  font-family: var(--font-data);
  font-weight: 700;
  font-size: clamp(26px, 4.6vw, 42px);
  line-height: 1;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  color: var(--paper-ink);
}

.page-about .data-figure-unit {
  font-size: 0.42em;
  margin-left: 0.32em;
  color: var(--grey);
  letter-spacing: 0;
}

.page-about .data-figure-label {
  font-size: 13px;
  line-height: 1.55;
  color: rgba(27, 31, 36, 0.66);
  margin-top: 9px;
}

/* ---------- 主体双栏 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 52px);
  padding-block: clamp(36px, 6vw, 78px);
}

.page-about .about-stream {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding-block: clamp(32px, 5vw, 60px);
  border-top: 1px solid var(--paper-line);
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .section-head {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .section-no {
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--orange-deep);
  margin: 0 0 8px;
}

.page-about .section-head h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0;
  max-width: 22ch;
  color: var(--paper-ink);
}

.page-about .note {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(27, 31, 36, 0.62);
  margin: 12px 0 0;
  max-width: 52em;
}

.page-about .stage-footnote {
  margin-top: clamp(20px, 3vw, 30px);
  padding-left: 14px;
  border-left: 2px solid var(--violet-a42);
}

.page-about .prose {
  max-width: 40em;
}

.page-about .prose p {
  font-size: 17px;
  line-height: 1.78;
  color: rgba(27, 31, 36, 0.86);
  margin: 0 0 1.1em;
}

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

/* ---------- 图文组合 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 34px);
  align-items: start;
}

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

.page-about .about-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--paper-line-strong);
  background: linear-gradient(150deg, var(--ink-800), var(--ink-900));
}

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

.page-about .about-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(201, 214, 226, 0.18) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(201, 214, 226, 0.18) 1px, transparent 1px);
  background-size: 52px 52px;
  opacity: 0.7;
}

.page-about .frame-4x3 { aspect-ratio: 4 / 3; }
.page-about .frame-3x4 { aspect-ratio: 3 / 4; }
.page-about .frame-16x9 { aspect-ratio: 16 / 9; }

.page-about .about-figure figcaption {
  font-size: 13px;
  line-height: 1.65;
  color: rgba(27, 31, 36, 0.6);
  margin-top: 10px;
  padding-left: 12px;
  border-left: 2px solid var(--paper-line-strong);
}

/* ---------- 阶段编年 ---------- */
.page-about .stage-track {
  position: relative;
  padding-top: 26px;
}

.page-about .stage-track::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--paper-line-strong) 0%, var(--paper-line-strong) 62%, transparent 100%);
  transform: rotate(-1.1deg);
  transform-origin: left center;
}

.page-about .stage-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .stage-item {
  position: relative;
}

.page-about .stage-item::before {
  content: "";
  position: absolute;
  top: -20px;
  left: 20px;
  width: 1px;
  height: 14px;
  background: var(--paper-line-strong);
}

.page-about .stage-card {
  border: 1px solid var(--paper-line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.52), rgba(255, 255, 255, 0));
}

.page-about .stage-card[open] {
  border-color: var(--paper-line-strong);
  box-shadow: 6px 6px 0 -1px rgba(27, 31, 36, 0.05);
}

.page-about .stage-card summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .stage-card summary::after {
  content: "+";
  font-family: var(--font-data);
  font-size: 18px;
  line-height: 1;
  color: var(--grey);
  transition: transform 0.22s var(--ease);
}

.page-about .stage-card[open] summary::after {
  transform: rotate(45deg);
}

.page-about .stage-card summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .stage-no {
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--violet);
}

.page-about .stage-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 2.2vw, 20px);
  letter-spacing: -0.01em;
  color: var(--paper-ink);
}

.page-about .stage-tag {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--paper-ink);
  border: 1px solid var(--paper-line-strong);
  padding: 3px 8px;
  white-space: nowrap;
}

.page-about .stage-card p {
  font-size: 16px;
  line-height: 1.78;
  color: rgba(27, 31, 36, 0.84);
  margin: 0;
  padding: 2px 16px 18px;
  max-width: 46em;
}

/* ---------- 贡献曲线 ---------- */
.page-about .curve-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 34px);
  align-items: start;
}

.page-about .curve-grid .about-frame {
  max-width: 340px;
}

.page-about .curve-svg-wrap {
  margin-top: clamp(24px, 4vw, 38px);
  padding: 16px 10px 6px;
  border: 1px solid var(--paper-line);
  background: linear-gradient(180deg, #FBF7EF, rgba(242, 235, 221, 0.5));
}

.page-about .curve-svg-wrap svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .curve-label {
  font-family: var(--font-data);
  font-size: 15px;
  font-weight: 700;
  fill: var(--paper-ink);
}

.page-about .curve-axis {
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.04em;
  fill: var(--grey);
}

.page-about .slot-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  margin-top: 18px;
  padding: 14px 16px;
  border: 1px dashed var(--paper-line-strong);
}

.page-about .slot-band-label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: rgba(27, 31, 36, 0.66);
}

.page-about .slot-band-track {
  position: relative;
  display: block;
  height: 4px;
  background: rgba(27, 31, 36, 0.1);
}

.page-about .slot-band-track i {
  position: absolute;
  inset: 0 auto 0 0;
  display: block;
  width: 34%;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
}

.page-about .slot-band-value {
  font-family: var(--font-data);
  font-size: 15px;
  color: var(--paper-ink);
  font-variant-numeric: tabular-nums;
}

/* ---------- 轮换价值 ---------- */
.page-about .squad-figure {
  margin-bottom: clamp(22px, 3.4vw, 34px);
}

/* ---------- 来源与校核 ---------- */
.page-about .source-list {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  border-top: 1px solid var(--paper-line);
}

.page-about .source-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 13px 0;
  border-bottom: 1px solid var(--paper-line);
}

.page-about .source-key {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange-deep);
}

.page-about .source-val {
  font-size: 15.5px;
  line-height: 1.7;
  color: rgba(27, 31, 36, 0.84);
}

.page-about .source-links {
  font-size: 15px;
  line-height: 1.85;
  color: rgba(27, 31, 36, 0.78);
  margin: clamp(20px, 3vw, 28px) 0 0;
}

.page-about .source-links a {
  color: var(--cyan-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-a42);
}

.page-about .source-links a:hover,
.page-about .source-links a:focus-visible {
  border-bottom-color: var(--cyan-deep);
}

/* ---------- 档案夹侧栏 ---------- */
.page-about .about-rail {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-about .rail-card {
  border: 1px solid var(--paper-line);
  border-top: 3px solid var(--paper-ink);
  background: rgba(255, 255, 255, 0.44);
  padding: 16px 16px 18px;
}

.page-about .rail-title {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: rgba(27, 31, 36, 0.62);
  margin: 0 0 10px;
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .rail-list a {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 8px 8px 8px 6px;
  font-size: 15px;
  color: var(--paper-ink);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .rail-list a:hover,
.page-about .rail-list a:focus-visible {
  border-left-color: var(--cyan-deep);
  background: rgba(53, 224, 214, 0.1);
}

.page-about .rail-no {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--grey);
}

.page-about .rail-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .rail-chip {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.05em;
  padding: 5px 9px;
  border: 1px solid var(--paper-line-strong);
  color: var(--paper-ink);
  background: rgba(140, 123, 255, 0.1);
}

.page-about .rail-note {
  font-size: 13px;
  line-height: 1.7;
  color: rgba(27, 31, 36, 0.6);
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--paper-line-strong);
}

/* ---------- 响应式 ---------- */
@media (min-width: 480px) {
  .page-about .slot-band {
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: 16px;
  }

  .page-about .source-list li {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }
}

@media (min-width: 720px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }

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

  .page-about .curve-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, var(--about-rail-w));
    gap: clamp(40px, 5vw, 80px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 26px);
  }
}

@media (min-width: 1200px) {
  .page-about .about-lede {
    max-width: 44em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stage-card summary::after,
  .page-about .rail-list a {
    transition: none;
  }
}