/* ============================================================
   品牌中心 /brand/ · 页面专属样式
   作用域：.page-about
   ============================================================ */

.page-about {
  --rail: 124px;
  --hair: 1px solid var(--line);
  background: var(--ink);
  color: var(--chalk);
  padding-bottom: clamp(40px, 8vw, 96px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(92px, 13vw, 150px);
  padding-bottom: clamp(28px, 5vw, 56px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 96px);
  opacity: .45;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, .16) 72%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, .16) 72%, transparent 100%);
}

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

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(28px, 5vw, 52px);
  margin-top: clamp(24px, 4vw, 40px);
  align-items: start;
}

@media (min-width: 980px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: end;
  }
}

.page-about .about-hero__copy h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 5.4vw, 62px);
  line-height: 1.1;
  letter-spacing: -.015em;
  margin: 14px 0 0;
  color: var(--chalk);
}

.page-about .about-hero__lead {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.78;
  color: var(--muted);
  max-width: 56ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: var(--hair);
}

.page-about .fact {
  background: var(--panel);
  padding: 16px 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .fact__figure {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0;
}

.page-about .fact__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 5vw, 40px);
  line-height: 1;
  color: var(--neon);
}

.page-about .fact__unit {
  font-size: 12px;
  color: var(--chalk);
  opacity: .78;
}

.page-about .fact__label {
  margin: 0;
  font-size: var(--fs-note);
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 品牌主张 ---------- */
.page-about .about-claim {
  border-top: var(--hair);
}

.page-about .claims {
  list-style: none;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .claim {
  border: var(--hair);
  background: var(--panel);
  padding: 16px 18px;
  transition: border-color .2s ease;
}

.page-about .claim:hover,
.page-about .claim:focus-within,
.page-about .claim:focus-visible {
  border-color: var(--neon-deep);
}

.page-about .claim:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 2px;
}

.page-about .claim__text {
  display: block;
  font-weight: 500;
  font-size: clamp(16px, 1.7vw, 18px);
  line-height: 1.6;
  color: var(--chalk);
}

.page-about .claim__support {
  display: block;
  margin-top: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--neon);
  transition: max-height .32s ease-out, opacity .32s ease-out, margin-top .32s ease-out;
}

.page-about .claim:hover .claim__support,
.page-about .claim:focus-within .claim__support,
.page-about .claim:focus-visible .claim__support {
  max-height: 7rem;
  opacity: 1;
  margin-top: 8px;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline .lead {
  max-width: 62ch;
  color: var(--muted);
}

.page-about .about-figure {
  margin: clamp(24px, 4vw, 40px) 0 0;
}

.page-about .about-figure .figure__media img,
.page-about .team__figure .figure__media img,
.page-about .crowd__figure .figure__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .timeline {
  display: grid;
  gap: 20px;
  margin-top: clamp(28px, 4vw, 48px);
}

@media (min-width: 900px) {
  .page-about .timeline {
    grid-template-columns: var(--rail) minmax(0, 1fr);
    gap: clamp(30px, 4vw, 56px);
  }
}

.page-about .timeline__rail {
  position: sticky;
  top: calc(var(--header-h) + 14px);
  align-self: start;
  z-index: 4;
  background: var(--ink);
}

@media (max-width: 899px) {
  .page-about .timeline__rail {
    border-bottom: var(--hair);
    padding: 8px 0;
  }
}

.page-about .timeline__ticks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

@media (min-width: 900px) {
  .page-about .timeline__ticks {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    border-left: var(--hair);
  }
}

.page-about .tick {
  display: block;
  position: relative;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  border: var(--hair);
  background: var(--panel);
  transition: color .2s ease, border-color .2s ease;
}

.page-about .tick:hover,
.page-about .tick:focus-visible {
  color: var(--chalk);
  border-color: var(--neon-deep);
}

.page-about .tick:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 2px;
}

.page-about .tick.is-active {
  color: var(--neon);
}

@media (min-width: 900px) {
  .page-about .tick {
    border: 0;
    background: none;
    padding: 10px 8px 10px 20px;
  }

  .page-about .tick::before {
    content: "";
    position: absolute;
    left: -4.5px;
    top: 50%;
    width: 8px;
    height: 8px;
    margin-top: -4px;
    background: var(--ink);
    border: 1px solid var(--line);
  }

  .page-about .tick:hover::before,
  .page-about .tick:focus-visible::before {
    background: var(--neon-deep);
    border-color: var(--neon-deep);
  }

  .page-about .tick.is-active::before {
    background: var(--neon);
    border-color: var(--neon);
  }
}

.page-about .timeline__stream {
  display: grid;
  gap: clamp(18px, 2.6vw, 26px);
  min-width: 0;
}

.page-about .tl-node {
  background: var(--panel);
  border: var(--hair);
  padding: clamp(18px, 3vw, 28px);
  box-shadow: 7px -7px 0 -1px var(--ink), 7px -7px 0 0 var(--line);
}

.page-about .tl-node .tl-node__stamp {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--neon);
}

.page-about .tl-node .tl-node__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(19px, 2.1vw, 24px);
  line-height: 1.4;
  color: var(--chalk);
}

.page-about .tl-node p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 四条内容线 ---------- */
.page-about .about-system {
  border-top: var(--hair);
}

.page-about .layers {
  display: grid;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .layer {
  display: grid;
  gap: 10px;
  background: var(--panel);
  border: var(--hair);
  padding: clamp(18px, 2.6vw, 26px);
}

@media (min-width: 760px) {
  .page-about .layer {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: clamp(18px, 3vw, 34px);
    align-items: start;
  }
}

.page-about .layer__no {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.2vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--neon);
  margin: 0;
}

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

.page-about .layer__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(18px, 2vw, 21px);
  line-height: 1.4;
  margin: 0 0 8px;
  color: var(--chalk);
}

.page-about .layer__body p {
  margin: 0 0 12px;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--muted);
}

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

.page-about .layer__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
}

/* ---------- 团队分工 ---------- */
.page-about .team {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(24px, 3.6vw, 36px);
}

@media (min-width: 920px) {
  .page-about .team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }
}

.page-about .team__roles {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: var(--hair);
}

.page-about .role {
  background: var(--panel);
  padding: 18px 20px 20px;
  border-left: 3px solid var(--line);
  transition: border-color .2s ease;
}

.page-about .role:hover {
  border-left-color: var(--neon);
}

.page-about .role__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  line-height: 1.4;
  margin: 0 0 8px;
  color: var(--chalk);
}

.page-about .role__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

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

.page-about .about-team__note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--neon-deep);
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
  max-width: 70ch;
}

/* ---------- 更新节奏表 ---------- */
.page-about .about-rhythm {
  border-top: var(--hair);
}

.page-about .rhythm {
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .rhythm__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.page-about .rhythm__filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.page-about .rhythm__btn {
  display: inline-block;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--muted);
  background: var(--panel);
  border: var(--hair);
  cursor: pointer;
  transition: color .2s ease, border-color .2s ease, background-color .2s ease;
}

.page-about .rhythm__btn:hover {
  color: var(--chalk);
  border-color: var(--neon-deep);
}

.page-about #rhythm-all:checked ~ .rhythm__filters label[for="rhythm-all"],
.page-about #rhythm-round:checked ~ .rhythm__filters label[for="rhythm-round"],
.page-about #rhythm-week:checked ~ .rhythm__filters label[for="rhythm-week"],
.page-about #rhythm-stage:checked ~ .rhythm__filters label[for="rhythm-stage"] {
  color: var(--ink);
  background: var(--neon);
  border-color: var(--neon);
}

.page-about #rhythm-round:checked ~ .rhythm__scroll tbody tr:not(.is-round),
.page-about #rhythm-week:checked ~ .rhythm__scroll tbody tr:not(.is-week),
.page-about #rhythm-stage:checked ~ .rhythm__scroll tbody tr:not(.is-stage) {
  display: none;
}

.page-about .rhythm__scroll {
  overflow-x: auto;
  border: var(--hair);
  background: var(--panel);
}

.page-about .rhythm__table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: 15px;
}

.page-about .rhythm__caption {
  caption-side: top;
  text-align: left;
  padding: 14px 18px 0;
  font-size: 12.5px;
  letter-spacing: .05em;
  color: var(--muted);
}

.page-about .rhythm__table th,
.page-about .rhythm__table td {
  text-align: left;
  vertical-align: top;
  padding: 14px 18px;
  border-bottom: var(--hair);
  line-height: 1.7;
}

.page-about .rhythm__table thead th {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--neon);
  background: var(--ink);
  border-bottom: 1px solid var(--neon-deep);
}

.page-about .rhythm__table tbody tr:nth-child(even) {
  background: rgba(242, 246, 239, .03);
}

.page-about .rhythm__table tbody th {
  font-weight: 500;
  color: var(--chalk);
  white-space: nowrap;
}

.page-about .rhythm__table tbody td {
  color: var(--muted);
}

.page-about .rhythm__table tbody tr:last-child th,
.page-about .rhythm__table tbody tr:last-child td {
  border-bottom: 0;
}

/* ---------- 球迷组织生态 ---------- */
.page-about .about-crowd {
  border-top: var(--hair);
}

.page-about .crowd {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

@media (min-width: 920px) {
  .page-about .crowd {
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
    align-items: start;
  }
}

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

.page-about .crowd__copy .section-title {
  margin-top: 10px;
}

.page-about .crowd__copy p {
  margin: clamp(14px, 2vw, 20px) 0 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--muted);
  max-width: 62ch;
}

.page-about .metrics {
  margin: clamp(20px, 3vw, 28px) 0 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: var(--hair);
}

.page-about .metric {
  background: var(--panel);
  padding: 14px 18px;
  display: grid;
  gap: 4px;
}

.page-about .metric dt {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--neon);
}

.page-about .metric dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-link {
  color: var(--electric);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 125, 255, .45);
  transition: color .2s ease, border-color .2s ease;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

.page-about .about-link:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 3px;
}

.page-about .crowd__copy .crowd__link {
  margin-top: clamp(18px, 2.4vw, 24px);
}

/* ---------- 收尾 ---------- */
.page-about .about-outro {
  border-top: var(--hair);
  margin-top: clamp(20px, 4vw, 40px);
}

.page-about .about-outro .rule {
  margin: 0 0 clamp(20px, 3vw, 30px);
}

.page-about .about-outro__line {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.35;
  color: var(--chalk);
}

.page-about .about-outro__sub {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--muted);
}

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

/* ---------- 降级动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .claim,
  .page-about .claim__support,
  .page-about .tick,
  .page-about .rhythm__btn,
  .page-about .role,
  .page-about .about-link {
    transition: none;
  }
}