/* ================= 品牌档案 /about-us/ ================= */

.page-about {
  --ab-gap: clamp(18px, 3vw, 34px);
  --ab-sec: clamp(46px, 7vw, 92px);
  --ab-line: #C9BFA9;
  --ab-panel-line: rgba(243, 237, 224, 0.14);
  --ab-panel-text: rgba(243, 237, 224, 0.68);
  padding-bottom: clamp(56px, 8vw, 96px);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  padding-top: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.page-about .crumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}
.page-about .crumbs a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.page-about .crumbs__sep {
  padding: 0 8px;
  color: var(--rule);
}
.page-about .crumbs [aria-current="page"] {
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 16px;
  padding: 30px 0 0;
}

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

.page-about .about-hero__eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--accent);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-sans);
  font-size: clamp(46px, 12vw, 92px);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.035em;
  color: var(--ink);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-hero__points {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ab-line);
}
.page-about .about-hero__points li {
  position: relative;
  padding: 12px 0 12px 26px;
  border-bottom: 1px solid var(--ab-line);
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}
.page-about .about-hero__points li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 20px;
  width: 12px;
  height: 2px;
  background: var(--accent);
}

/* ---------- 关键规模面板 ---------- */
.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 34px;
  background: var(--panel);
  border-left: 3px solid var(--fluoro);
}

.page-about .figure-cell {
  padding: 20px 16px 22px;
}
.page-about .figure-cell:nth-child(even) {
  border-left: 1px solid var(--ab-panel-line);
}
.page-about .figure-cell:nth-child(n + 3) {
  border-top: 1px solid var(--ab-panel-line);
}

.page-about .figure-cell__line {
  display: flex;
  align-items: baseline;
  gap: 5px;
}
.page-about .figure-cell__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 6vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--fluoro);
}
.page-about .figure-cell__unit {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ab-panel-text);
}
.page-about .figure-cell__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--ab-panel-text);
}

/* ---------- 章节骨架 ---------- */
.page-about .section {
  padding: var(--ab-sec) 0 0;
}
.page-about .section + .section {
  border-top: 1px solid var(--ab-line);
}

.page-about .sec-num {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}
.page-about .sec-title {
  font-weight: 700;
  letter-spacing: -0.015em;
}

.page-about .about-prose {
  margin-top: 22px;
}
.page-about .about-prose p {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.82;
  color: var(--ink);
}
.page-about .about-prose p:last-child {
  margin-bottom: 0;
}
.page-about .about-prose--wide p {
  max-width: 74ch;
}

/* ---------- 两栏 ---------- */
.page-about .about-cols {
  display: grid;
  gap: var(--ab-gap);
}
.page-about .about-cols .about-prose {
  margin-top: 22px;
}

/* ---------- 最小记录单元卡 ---------- */
.page-about .min-unit {
  padding: 22px 20px 8px;
  align-self: start;
}
.page-about .min-unit__label {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--accent);
}
.page-about .min-unit__list {
  margin: 0;
}
.page-about .min-unit__row {
  padding: 14px 0;
  border-top: 1px solid var(--ab-line);
}
.page-about .min-unit__row dt {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 6px;
}
.page-about .min-unit__row dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 三节点刻度线 ---------- */
.page-about .tickline {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 24px;
}
.page-about .tickline__item {
  position: relative;
  padding-top: 26px;
}
.page-about .tickline__dot {
  position: absolute;
  top: 0;
  left: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--rule);
  box-shadow: 0 0 0 3px var(--paper);
}
.page-about .tickline__item--a .tickline__dot { background: var(--summer); }
.page-about .tickline__item--b .tickline__dot { background: var(--autumn); }
.page-about .tickline__item--c .tickline__dot { background: var(--winter); }

.page-about .tickline__time {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 8px;
}
.page-about .tickline__name {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}
.page-about .tickline__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 折叠说明 ---------- */
.page-about .about-fold {
  margin: 30px 0 0;
  border: 1px solid var(--ab-line);
  background: var(--paper-2);
}
.page-about .about-fold summary {
  padding: 14px 18px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 10px;
}
.page-about .about-fold summary::-webkit-details-marker {
  display: none;
}
.page-about .about-fold summary::before {
  content: "";
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--winter);
  border-bottom: 2px solid var(--winter);
  transform: rotate(-45deg);
  transition: transform 0.28s var(--ease);
  margin-right: 2px;
}
.page-about .about-fold[open] summary::before {
  transform: rotate(45deg);
}
.page-about .about-fold__body {
  padding: 4px 18px 18px;
  border-top: 1px solid var(--ab-line);
}
.page-about .about-fold__body p {
  margin: 14px 0 0;
  max-width: 72ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 34px 0 0;
  border: 1px solid var(--ab-line);
  background: var(--paper-2);
  overflow: hidden;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--ab-line);
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 四层赛事结构 ---------- */
.page-about .tiers {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--ab-line);
}
.page-about .tiers__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 20px 16px 20px 20px;
  border-bottom: 1px solid var(--ab-line);
  border-left: 4px solid var(--rule);
  background: linear-gradient(90deg, rgba(201, 191, 169, 0.22), rgba(201, 191, 169, 0) 62%);
}
.page-about .tiers__item--l1 { border-left-color: var(--spring); }
.page-about .tiers__item--l2 { border-left-color: var(--summer); }
.page-about .tiers__item--l3 { border-left-color: var(--autumn); }
.page-about .tiers__item--l4 { border-left-color: var(--winter); }

.page-about .tiers__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}
.page-about .tiers__name {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}
.page-about .tiers__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}
.page-about .tiers__tag {
  align-self: start;
  justify-self: start;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink);
  background: var(--paper-2);
  border: 1px solid var(--ab-line);
}
.page-about .tiers__footnote {
  margin: 18px 0 0;
  max-width: 72ch;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
  padding-left: 14px;
  border-left: 2px solid var(--rule);
}

/* ---------- 团队面板 ---------- */
.page-about .team-panel {
  padding: 22px 20px;
  background: var(--panel);
  border-left: 3px solid var(--fluoro);
  align-self: start;
  margin-top: 22px;
}
.page-about .team-panel__label {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--fluoro);
}
.page-about .team-panel__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .team-panel__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 6px;
  padding: 16px 0;
  border-top: 1px solid var(--ab-panel-line);
}
.page-about .team-panel__num {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--fluoro);
}
.page-about .team-panel__unit {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ab-panel-text);
}
.page-about .team-panel__txt {
  flex: 1 1 100%;
  font-size: 13px;
  line-height: 1.62;
  color: var(--paper);
  opacity: 0.82;
}
.page-about .team-panel__foot {
  margin: 14px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--ab-panel-line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--ab-panel-text);
}

/* ---------- 赛季色带 ---------- */
.page-about .era-scroll {
  margin-top: 30px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 10px;
}
.page-about .era {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  width: max-content;
  min-width: 100%;
  border-bottom: 2px solid var(--rule);
}
.page-about .era__cell {
  flex: 1 0 84px;
  padding: 16px 10px 14px;
  border-left: 1px solid var(--ab-line);
  border-top: 3px solid var(--rule);
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: transform 0.25s var(--ease);
}
.page-about .era__cell:last-child {
  border-right: 1px solid var(--ab-line);
}
.page-about .era__cell--v1 { border-top-color: var(--rule); }
.page-about .era__cell--v2 { border-top-color: var(--summer); }
.page-about .era__cell--v3 { border-top-color: var(--winter); }
.page-about .era__cell--cur {
  border-top-color: var(--accent);
  background: var(--paper-2);
}
.page-about .era__year {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}
.page-about .era__ver {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.page-about .era-hint {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 版本标签页 ---------- */
.page-about .ver-tabs {
  margin-top: 34px;
  position: relative;
}
.page-about .ver-tabs__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}
.page-about .ver-tabs__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  border-bottom: 2px solid var(--rule);
  padding-bottom: 8px;
}
.page-about .ver-tabs__tab {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 9px 14px;
  cursor: pointer;
  background: var(--paper-2);
  border: 1px solid var(--ab-line);
  border-bottom: none;
  color: var(--muted);
  transition: background 0.25s var(--ease), color 0.25s var(--ease);
}
.page-about .ver-tabs__tab:hover {
  background: var(--paper);
  color: var(--ink);
}
.page-about .ver-tabs__v {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
}
.page-about .ver-tabs__t {
  font-size: 13px;
}

.page-about #about-ver-1:checked ~ .ver-tabs__bar label[for="about-ver-1"],
.page-about #about-ver-2:checked ~ .ver-tabs__bar label[for="about-ver-2"],
.page-about #about-ver-3:checked ~ .ver-tabs__bar label[for="about-ver-3"] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.page-about .ver-tabs:focus-within .ver-tabs__bar {
  outline: 2px solid var(--winter);
  outline-offset: 4px;
}

.page-about .ver-tabs__panels {
  padding-top: 22px;
}
.page-about .ver-panel {
  display: none;
}
.page-about #about-ver-1:checked ~ .ver-tabs__panels .ver-panel--1,
.page-about #about-ver-2:checked ~ .ver-tabs__panels .ver-panel--2,
.page-about #about-ver-3:checked ~ .ver-tabs__panels .ver-panel--3 {
  display: block;
}

.page-about .ver-panel__lead {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
  font-weight: 700;
}
.page-about .ver-panel__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--ab-line);
}
.page-about .ver-panel__list li {
  position: relative;
  padding: 13px 0 13px 22px;
  border-bottom: 1px solid var(--ab-line);
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}
.page-about .ver-panel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 21px;
  width: 10px;
  height: 1px;
  background: var(--accent);
}

/* ---------- 勘误卡 ---------- */
.page-about .errata-card {
  padding: 22px 20px;
  margin-top: 22px;
  align-self: start;
}
.page-about .errata-card__label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--accent);
}
.page-about .errata-card__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .errata-card__list li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 8px;
  align-items: start;
  padding: 13px 0;
  border-top: 1px solid var(--ab-line);
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink);
}
.page-about .errata-card__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  padding-top: 4px;
}
.page-about .errata-card__foot {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}
.page-about .errata-card__btn {
  margin-top: 18px;
}

/* ---------- 卷末提示 ---------- */
.page-about .about-tailnote {
  margin-top: var(--ab-sec);
  padding-top: 20px;
  border-top: 1px solid var(--ab-line);
}
.page-about .about-tailnote p {
  margin: 0;
  max-width: 80ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}
.page-about .about-tailnote a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--accent);
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}
.page-about .about-tailnote a:hover {
  color: var(--accent);
}

/* ================= 响应式 ================= */

@media (min-width: 620px) {
  .page-about .tiers__item {
    grid-template-columns: 52px minmax(0, 1fr) auto;
    align-items: start;
    gap: 14px;
  }
  .page-about .tiers__tag {
    justify-self: end;
  }
}

@media (min-width: 760px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .figure-cell {
    border-top: 0;
  }
  .page-about .figure-cell:nth-child(n + 2) {
    border-left: 1px solid var(--ab-panel-line);
  }

  .page-about .tickline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }
  .page-about .tickline::before {
    content: "";
    position: absolute;
    top: 5px;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--rule);
  }

  .page-about .about-hero__points {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-top: 1px solid var(--ab-line);
  }
  .page-about .about-hero__points li {
    border-bottom: none;
    border-right: 1px solid var(--ab-line);
    padding-right: 20px;
  }
  .page-about .about-hero__points li:last-child {
    border-right: none;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 40px;
    padding-top: 52px;
  }
  .page-about .about-hero__vnote {
    display: block;
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    justify-self: start;
    align-self: start;
    max-height: 300px;
    overflow: hidden;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.26em;
    color: var(--muted);
    white-space: nowrap;
  }

  .page-about .about-cols {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 52px;
    align-items: start;
  }
  .page-about .about-cols--reverse {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
  .page-about .about-cols .about-prose {
    margin-top: 26px;
  }
  .page-about .min-unit,
  .page-about .team-panel,
  .page-about .errata-card {
    margin-top: 28px;
  }

  .page-about .about-figure--bleed {
    margin-top: 40px;
  }

  .page-about .about-figure figcaption {
    padding: 14px 20px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-prose p {
    font-size: 17px;
  }
  .page-about .tickline__name {
    font-size: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .crumbs a,
  .page-about .ver-tabs__tab,
  .page-about .era__cell,
  .page-about .about-tailnote a {
    transition: none;
  }
  .page-about .about-fold summary::before {
    transition: none;
  }
}
<<<END>>>