/* ============ 品牌总览页 ============ */

.page-about {
  --about-rail-w: 208px;
  --about-pad: 24px;
  position: relative;
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
}

@media (min-width: 720px) {
  .page-about { --about-pad: 38px; }
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 26px 0 54px;
  background-color: var(--ink);
  border-bottom: var(--border-w) solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -20%;
  right: -14%;
  width: 80%;
  height: 136%;
  background: linear-gradient(202deg, var(--wine) 0%, var(--wine-soft) 56%, rgba(23, 21, 28, 0) 100%);
  clip-path: polygon(20% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(216, 169, 74, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(216, 169, 74, 0.07) 1px, transparent 1px);
  background-size: 52px 52px;
  pointer-events: none;
}

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

.page-about .breadcrumb {
  font-size: 13px;
  color: var(--gray-gold);
}

.page-about .breadcrumb a { color: var(--gold-bright); }

.page-about .about-hero .eyebrow {
  margin-top: 18px;
  color: var(--gold);
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 5vw, 62px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 12px 0 0;
  max-width: 21ch;
  text-wrap: balance;
}

.page-about .about-lead {
  margin: 20px 0 0;
  max-width: 56ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: #E3DACB;
}

.page-about .about-stats {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: var(--border-w) solid var(--line);
}

@media (min-width: 760px) {
  .page-about .about-stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

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

.page-about .about-stat-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  color: var(--gold-bright);
}

.page-about .about-stat-label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--gray-gold);
}

/* ---------- 主布局 ---------- */

.page-about .about-layout {
  display: grid;
  gap: 28px;
  padding: 44px 0 56px;
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }
}

/* ---------- 侧边章节轨道 ---------- */

.page-about .about-rail {
  border: var(--border-w) solid var(--line);
  background: var(--ink-2);
  padding: 16px;
}

@media (min-width: 1000px) {
  .page-about .about-rail {
    position: sticky;
    top: 92px;
    padding: 20px 16px;
    background: linear-gradient(180deg, rgba(74, 14, 30, 0.55), rgba(32, 29, 38, 0.92));
  }
}

.page-about .about-rail-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-rail-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
}

@media (min-width: 1000px) {
  .page-about .about-rail-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }
}

.page-about .about-rail-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  font-size: 14px;
  line-height: 1.4;
  padding: 8px 10px;
  border: 1px solid var(--line);
  color: var(--gray-gold);
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-rail-link:hover,
.page-about .about-rail-link:focus-visible {
  color: var(--gold-bright);
  border-color: var(--gold);
  background: rgba(216, 169, 74, 0.08);
}

.page-about .about-rail-link .num {
  color: var(--gold);
  font-size: 12px;
}

@media (min-width: 1000px) {
  .page-about .about-rail-link {
    border: 0;
    border-left: 2px solid var(--line);
    padding: 8px 0 8px 12px;
    white-space: normal;
    background: transparent;
  }

  .page-about .about-rail-link:hover,
  .page-about .about-rail-link:focus-visible {
    border-left-color: var(--gold);
    background: transparent;
  }
}

.page-about .about-rail-cta { display: none; }

@media (min-width: 1000px) {
  .page-about .about-rail-cta {
    display: block;
    margin-top: 16px;
    padding: 10px 12px;
    border: var(--border-w) solid var(--gold);
    color: var(--gold-bright);
    text-decoration: none;
    font-size: 14px;
    text-align: center;
    transition: background-color 0.2s var(--ease), color 0.2s var(--ease);
  }

  .page-about .about-rail-cta:hover,
  .page-about .about-rail-cta:focus-visible {
    background: var(--gold);
    color: var(--wine);
  }
}

/* ---------- 内容分区 ---------- */

.page-about .about-stage {
  display: grid;
  gap: 34px;
  min-width: 0;
}

.page-about .about-block {
  position: relative;
  border: var(--border-w) solid var(--line);
  background: var(--ink-2);
  color: #D9D2C6;
  padding: var(--about-pad);
  scroll-margin-top: 112px;
}

.page-about .about-block .eyebrow {
  color: var(--gold);
  margin: 0;
}

.page-about .about-block .section-title {
  color: inherit;
  margin: 10px 0 0;
}

.page-about .about-block p {
  font-size: 16px;
  line-height: 1.85;
  margin: 16px 0 0;
  max-width: 68ch;
}

.page-about .about-block--paper {
  background: var(--paper);
  color: var(--text-dark);
  border-color: var(--text-dark);
  box-shadow: var(--shadow-hard);
}

.page-about .about-block--paper .eyebrow { color: var(--wine); }

.page-about .about-block--wine {
  background: linear-gradient(155deg, var(--wine) 0%, #380A16 100%);
  color: var(--paper);
  border-color: var(--gold);
}

.page-about .about-block--wine .eyebrow { color: var(--gold-bright); }

/* ---------- 四条线索 ---------- */

.page-about .about-clues {
  display: grid;
  gap: 14px;
  margin-top: 26px;
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 700px) {
  .page-about .about-clues { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

.page-about .about-clue {
  position: relative;
  background: var(--ink);
  border: var(--border-w) solid var(--line);
  padding: 30px 18px 18px;
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .about-clue::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: var(--gold);
}

.page-about .about-clue:nth-child(2)::before { background: var(--neon); }
.page-about .about-clue:nth-child(3)::before { background: var(--harbor); }
.page-about .about-clue:nth-child(4)::before { background: var(--violet); }

.page-about .about-clue:hover {
  transform: translateY(-4px);
  border-color: var(--gold);
  box-shadow: var(--shadow-gold);
}

.page-about .about-clue-no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-clue h3 {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-size: 19px;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-clue p {
  margin-top: 10px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--gray-gold);
  max-width: none;
}

/* ---------- 四地标签页 ---------- */

.page-about .about-tabs { margin-top: 26px; }

.page-about .about-tabs .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.page-about .about-tabs .tab {
  font-family: var(--font-head);
  font-size: 15px;
  letter-spacing: 0.04em;
  padding: 9px 18px;
  border: var(--border-w) solid var(--text-dark);
  background: transparent;
  color: var(--text-dark);
  cursor: pointer;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-tabs .tab:hover { background: rgba(74, 14, 30, 0.1); }

.page-about .about-tabs .tab[aria-selected="true"] {
  background: var(--wine);
  color: var(--gold-bright);
  border-color: var(--wine);
  box-shadow: var(--shadow-hard);
}

.page-about .about-tabs .tab-panel {
  background: #FFFDF9;
  border: var(--border-w) solid var(--text-dark);
  padding: 20px 18px;
}

.page-about .about-panel-lede {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text-dark);
}

.page-about .about-facts {
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-facts > div {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding-bottom: 10px;
  border-bottom: 1px dashed rgba(30, 27, 34, 0.2);
}

.page-about .about-facts > div:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

@media (min-width: 560px) {
  .page-about .about-facts > div {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 12px;
  }
}

.page-about .about-facts dt {
  font-size: 13px;
  color: var(--wine);
  letter-spacing: 0.02em;
}

.page-about .about-facts dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-dark);
}

/* ---------- 图形 ---------- */

.page-about .about-figure {
  margin: 28px 0 0;
}

.page-about .about-figure .figure-frame {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: var(--border-w) solid var(--line);
  background: linear-gradient(135deg, var(--wine), var(--ink));
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-figure .figure-caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--gray-gold);
}

.page-about .about-block--paper .about-figure .figure-frame { border-color: var(--text-dark); }
.page-about .about-block--paper .about-figure .figure-caption { color: #6B6357; }
.page-about .about-block--wine .about-figure .figure-caption { color: var(--gold-bright); }

/* ---------- 额度时间轴 ---------- */

.page-about .about-timeline {
  position: relative;
  margin-top: 26px;
  padding-left: 22px;
  display: grid;
  gap: 12px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold), var(--violet));
}

.page-about .quota {
  position: relative;
  background: var(--ink);
  border: var(--border-w) solid var(--line);
  transition: border-color 0.2s var(--ease);
}

.page-about .quota:hover { border-color: var(--gold); }

.page-about .quota::before {
  content: "";
  position: absolute;
  left: -21px;
  top: 19px;
  width: 10px;
  height: 10px;
  box-sizing: border-box;
  background: var(--violet);
  border: 2px solid var(--ink);
}

.page-about .quota summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  color: var(--paper);
}

.page-about .quota summary::-webkit-details-marker { display: none; }
.page-about .quota summary::marker { content: ""; }

.page-about .quota-period {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--gold);
}

.page-about .quota-label {
  font-size: 14.5px;
  color: #D9D2C6;
}

.page-about .quota-delta {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12.5px;
  padding: 3px 10px;
  border: 1px solid var(--neon);
  border-radius: 999px;
  color: var(--neon);
  white-space: nowrap;
}

.page-about .quota[open] { border-color: var(--violet); }
.page-about .quota[open] summary { border-bottom: 1px dashed var(--line); }

.page-about .quota-body {
  margin: 0;
  padding: 14px 16px 16px;
  display: grid;
  gap: 10px;
}

.page-about .quota-field {
  display: grid;
  gap: 4px;
}

@media (min-width: 560px) {
  .page-about .quota-field {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 12px;
  }
}

.page-about .quota-field dt {
  font-size: 13px;
  color: var(--gray-gold);
}

.page-about .quota-field dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: #D9D2C6;
}

.page-about .about-timeline-note {
  margin-top: 18px;
  font-size: 13.5px;
  color: var(--gray-gold);
}

/* ---------- 维护流程 ---------- */

.page-about .about-steps {
  list-style: none;
  counter-reset: about-step;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 700px) {
  .page-about .about-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1100px) {
  .page-about .about-steps { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.page-about .about-steps li {
  position: relative;
  background: #FFFDF9;
  border: var(--border-w) solid var(--text-dark);
  padding: 36px 16px 16px;
}

.page-about .about-steps li::before {
  counter-increment: about-step;
  content: "0" counter(about-step);
  position: absolute;
  top: 12px;
  left: 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--wine);
}

.page-about .about-steps strong {
  display: block;
  font-family: var(--font-head);
  font-size: 17px;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.page-about .about-steps span {
  display: block;
  font-size: 14px;
  line-height: 1.72;
  color: #4A443B;
}

/* ---------- 团队分工 ---------- */

.page-about .about-roles {
  display: grid;
  gap: 12px;
  margin-top: 24px;
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 700px) {
  .page-about .about-roles { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

.page-about .about-role {
  background: var(--ink);
  border-left: 4px solid var(--gold);
  padding: 14px 16px;
}

.page-about .about-role:nth-child(2) { border-left-color: var(--neon); }
.page-about .about-role:nth-child(3) { border-left-color: var(--harbor); }
.page-about .about-role:nth-child(4) { border-left-color: var(--violet); }

.page-about .about-role h3 {
  margin: 0;
  font-family: var(--font-head);
  font-size: 17px;
  color: var(--paper);
}

.page-about .about-role p {
  margin-top: 8px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--gray-gold);
  max-width: none;
}

/* ---------- 版本演进 ---------- */

.page-about .about-versions {
  display: grid;
  gap: 14px;
  margin-top: 26px;
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 700px) {
  .page-about .about-versions { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1100px) {
  .page-about .about-versions { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.page-about .about-version {
  position: relative;
  background: rgba(23, 21, 28, 0.42);
  border: var(--border-w) solid rgba(242, 211, 134, 0.32);
  padding: 30px 16px 18px;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-version::before {
  content: "";
  position: absolute;
  top: -2px;
  left: -2px;
  height: 4px;
  width: var(--stage-w, 32%);
  background: var(--gold-bright);
}

.page-about .about-version:nth-child(1) { --stage-w: 32%; }
.page-about .about-version:nth-child(2) { --stage-w: 56%; }
.page-about .about-version:nth-child(3) { --stage-w: 78%; }
.page-about .about-version:nth-child(4) { --stage-w: 100%; }

.page-about .about-version:hover,
.page-about .about-version:focus-within {
  transform: translateY(-4px);
  border-color: var(--gold-bright);
  background: rgba(23, 21, 28, 0.62);
}

.page-about .about-version-no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--gold-bright);
}

.page-about .about-version h3 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-size: 18px;
  color: var(--paper);
}

.page-about .about-version p {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: #E6DCC9;
  max-width: none;
}

.page-about .about-version .about-version-extra {
  margin-top: 10px;
  font-size: 13px;
  color: var(--gold);
  opacity: 0.72;
  transition: opacity 0.2s var(--ease);
}

.page-about .about-version:hover .about-version-extra,
.page-about .about-version:focus-within .about-version-extra {
  opacity: 1;
}

/* ---------- 继续浏览 ---------- */

.page-about .about-next {
  display: grid;
  gap: 16px;
  margin-top: 26px;
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 760px) {
  .page-about .about-next { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

.page-about .about-next-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px 20px;
  border: var(--border-w) solid var(--gold);
  background: linear-gradient(158deg, rgba(74, 14, 30, 0.92) 0%, rgba(23, 21, 28, 0.96) 100%);
  color: var(--paper);
  text-decoration: none;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-next-card:hover,
.page-about .about-next-card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--gold-bright);
  box-shadow: var(--shadow-gold);
}

.page-about .about-next-kicker {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--neon);
}

.page-about .about-next-title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 24px;
  letter-spacing: -0.01em;
  color: var(--gold-bright);
}

.page-about .about-next-desc {
  font-size: 14.5px;
  line-height: 1.75;
  color: #D9D2C6;
}

.page-about .about-block .about-next-foot {
  margin-top: 22px;
  font-size: 14.5px;
  color: var(--gray-gold);
}

.page-about .about-next-foot a { color: var(--gold-bright); }

/* ---------- 减动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-clue,
  .page-about .about-version,
  .page-about .about-next-card,
  .page-about .quota,
  .page-about .about-rail-link,
  .page-about .about-rail-cta {
    transition: none;
  }

  .page-about .about-clue:hover,
  .page-about .about-version:hover,
  .page-about .about-next-card:hover {
    transform: none;
  }
}