.page-about {
  --about-rule: rgba(216, 166, 87, 0.45);
  --about-rule-soft: rgba(216, 166, 87, 0.28);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  overflow-x: hidden;
}

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

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.04;
  margin: 0;
  color: var(--ink);
  text-wrap: balance;
}

.page-about p {
  margin: 0 0 1.05em;
}

.page-about a {
  color: var(--red-deep);
  text-decoration: none;
}

/* ---------- 首屏 ---------- */
.about-hero {
  position: relative;
  padding: clamp(1.4rem, 5vw, 3rem) var(--gutter) clamp(2rem, 5vw, 3.5rem);
  border-bottom: 1px solid var(--about-rule);
  background:
    linear-gradient(180deg, rgba(226, 58, 46, 0.07) 0%, rgba(226, 58, 46, 0) 62%),
    var(--paper);
}

.about-hero-inner {
  max-width: var(--frame-w);
  margin-inline: auto;
}

.about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 1.1rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--brown);
}

.about-crumb a {
  color: var(--red-deep);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}

.about-crumb a:hover,
.about-crumb a:focus-visible {
  border-bottom-color: var(--orange);
}

.about-eyebrow {
  margin: 0 0 0.7rem;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--red-deep);
}

.about-hero h1 {
  max-width: 24ch;
  font-size: clamp(2.05rem, 6.2vw, 4.5rem);
}

.about-hero-lead {
  max-width: 60ch;
  margin-top: 1.1rem;
  font-size: clamp(1rem, 2.2vw, 1.125rem);
  color: var(--brown);
}

.about-hero-stats {
  list-style: none;
  margin: 1.8rem 0 0;
  padding: 1.1rem 0 0;
  border-top: 1px solid var(--about-rule);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.about-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--red);
  font-variant-numeric: tabular-nums;
}

.about-stat-label {
  display: block;
  margin-top: 0.4rem;
  font-size: 13px;
  line-height: 1.5;
  color: var(--brown);
}

/* ---------- 目录 + 正文骨架 ---------- */
.about-shell {
  max-width: var(--frame-w);
  margin-inline: auto;
  padding: clamp(1.75rem, 4vw, 3rem) var(--gutter) clamp(3rem, 7vw, 5rem);
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

.about-index {
  border-left: 2px solid var(--sand);
  padding-left: 0.9rem;
}

.about-index-title {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--red-deep);
}

.about-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.1rem;
}

.about-index-list a {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  padding: 0.4rem 0.3rem 0.4rem 0.4rem;
  font-size: 14px;
  line-height: 1.5;
  color: var(--brown);
  border-bottom: 1px solid var(--about-rule-soft);
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.about-index-list a:hover,
.about-index-list a:focus-visible {
  color: var(--red-deep);
  padding-left: 0.75rem;
}

.about-index-list .mono {
  font-size: 11px;
  color: var(--red);
  flex: none;
}

.about-index-note {
  margin: 0.9rem 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--brown);
}

.about-body {
  min-width: 0;
}

.about-sec {
  padding-block: clamp(1.5rem, 3.5vw, 2.5rem);
}

.about-sec:first-child {
  padding-top: 0.25rem;
}

.about-sec + .about-sec {
  border-top: 1px solid var(--about-rule);
}

.about-sec-head {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 1.3rem;
}

.about-sec-num {
  flex: none;
  padding: 0.2rem 0.45rem;
  font-size: 12px;
  line-height: 1.4;
  letter-spacing: 0.08em;
  color: var(--white);
  background: var(--red);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 84% 100%, 0 100%);
}

.about-sec h2 {
  font-size: clamp(1.35rem, 3.5vw, 2.1rem);
  max-width: 30ch;
}

.about-figure {
  position: relative;
  margin: 0 0 1.4rem;
}

.about-figure img {
  display: block;
  width: 100%;
  object-fit: cover;
  border: 1px solid var(--about-rule);
}

.about-figure::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 0;
  height: 0;
  border-left: 22px solid transparent;
  border-bottom: 22px solid var(--sand);
}

.about-prose p {
  max-width: 64ch;
  color: var(--brown);
}

.about-motto {
  margin: 1.4rem 0 0;
  padding: 1.05rem 1.1rem 1.05rem 1.3rem;
  border-left: 3px solid var(--orange);
  background: linear-gradient(90deg, rgba(242, 107, 29, 0.12), rgba(242, 107, 29, 0) 86%);
  font-size: clamp(1rem, 2.2vw, 1.1rem);
  line-height: 1.75;
  color: var(--ink);
  max-width: 64ch;
}

.about-motto strong {
  color: var(--red-deep);
}

/* ---------- 场馆深色面板 ---------- */
.about-night {
  position: relative;
  padding: clamp(1.25rem, 3.5vw, 2.25rem);
  background: var(--night);
  color: var(--cold);
  overflow: hidden;
}

.about-night::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-top: 30px solid var(--sand);
  border-left: 30px solid transparent;
}

.about-night p {
  color: var(--cold);
  max-width: 64ch;
}

.about-night h2,
.about-night h3 {
  color: var(--white);
}

.about-venue-fields {
  margin: 1.3rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.about-venue-fields > div {
  padding-top: 0.6rem;
  border-top: 1px solid rgba(216, 166, 87, 0.32);
}

.about-venue-fields dt {
  margin-bottom: 0.22rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--sand);
}

.about-venue-fields dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--cold);
}

.about-cadence {
  margin: 1.3rem 0 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--sand);
}

.about-map {
  position: relative;
  margin: 1.3rem 0 0;
  border: 1px solid rgba(216, 166, 87, 0.32);
}

.about-map img {
  display: block;
  width: 100%;
  object-fit: cover;
  opacity: 0.82;
}

.about-map-hot {
  position: absolute;
  width: 13px;
  height: 13px;
  margin: -6.5px 0 0 -6.5px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 1px var(--night), 0 0 0 5px rgba(242, 107, 29, 0.22);
  cursor: default;
}

.about-map-hot:focus-visible {
  outline: 2px solid var(--white);
  outline-offset: 3px;
}

.about-map-hot:nth-of-type(1) { left: 36%; top: 56%; }
.about-map-hot:nth-of-type(2) { left: 42%; top: 46%; }
.about-map-hot:nth-of-type(3) { left: 32%; top: 41%; }
.about-map-hot:nth-of-type(4) { left: 23%; top: 33%; }
.about-map-hot:nth-of-type(5) { left: 17%; top: 57%; }
.about-map-hot:nth-of-type(6) { left: 53%; top: 66%; }
.about-map-hot:nth-of-type(7) { left: 72%; top: 50%; }
.about-map-hot:nth-of-type(8) { left: 35%; top: 83%; }

.about-map-tip {
  position: absolute;
  bottom: 160%;
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  padding: 0.16rem 0.45rem;
  background: var(--white);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.about-map-hot:hover .about-map-tip,
.about-map-hot:focus-visible .about-map-tip {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ---------- 团队 ---------- */
.about-team {
  display: grid;
  gap: 1.2rem;
}

.about-team-photo {
  position: relative;
  margin: 0;
}

.about-team-photo img {
  display: block;
  width: 100%;
  max-height: 420px;
  object-fit: cover;
  border: 1px solid var(--about-rule);
}

.about-team-photo::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 0;
  border-bottom: 26px solid var(--sand);
  border-right: 26px solid transparent;
}

.about-flow {
  display: grid;
  gap: 0.7rem;
  margin-top: 1.3rem;
}

.about-flow-card {
  padding: 0.85rem 0.85rem 0.95rem;
  background: var(--paper-2);
  border: 1px solid var(--about-rule);
  border-top: 3px solid var(--red);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-top-color var(--dur) var(--ease);
}

.about-flow-card:hover,
.about-flow-card:focus-within {
  transform: translateY(-3px);
  border-top-color: var(--orange);
  box-shadow: 5px 6px 0 rgba(216, 166, 87, 0.42);
}

.about-flow-card h3 {
  font-size: 1.05rem;
}

.about-flow-more {
  margin: 0.5rem 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--brown);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.about-flow-card:hover .about-flow-more,
.about-flow-card:focus-within .about-flow-more {
  max-height: 12rem;
  opacity: 1;
}

/* ---------- 版本时间线 ---------- */
.about-timeline {
  list-style: none;
  position: relative;
  margin: 1.4rem 0 0;
  padding: 0;
}

.about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: repeating-linear-gradient(180deg, var(--sand) 0 8px, transparent 8px 16px);
}

.about-tl-item {
  position: relative;
  padding: 0 0 1.15rem 2rem;
}

.about-tl-item:last-child {
  padding-bottom: 0;
}

.about-tl-item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.6rem;
  width: 13px;
  height: 13px;
  background: var(--paper);
  border: 2px solid var(--red);
  transform: rotate(45deg);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.about-tl-item:hover::before {
  background: var(--orange);
  border-color: var(--orange);
}

.about-tl-year {
  display: block;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--red-deep);
}

.about-tl-body h3 {
  margin: 0.15rem 0 0.3rem;
  font-size: 1.05rem;
}

.about-tl-body p {
  margin: 0;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--brown);
}

/* ---------- 协作与认可 ---------- */
.about-partner-grid {
  display: grid;
  gap: 0.8rem;
  margin-top: 1.2rem;
}

.about-partner-card {
  padding: 0.75rem 0.8rem 0.75rem 0.9rem;
  border-left: 2px solid var(--sand);
  background: linear-gradient(90deg, rgba(216, 166, 87, 0.16), rgba(216, 166, 87, 0) 92%);
}

.about-big {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.85rem;
  line-height: 1;
  color: var(--red);
  font-variant-numeric: tabular-nums;
}

.about-partner-card p {
  margin: 0.45rem 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--brown);
}

.about-honors {
  list-style: none;
  margin: 1.2rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.45rem;
}

.about-honors li {
  position: relative;
  padding-left: 1.15rem;
  font-size: 14px;
  line-height: 1.7;
  color: var(--brown);
}

.about-honors li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 10px;
  height: 2px;
  background: var(--orange);
}

/* ---------- 去处 ---------- */
.about-next-grid {
  display: grid;
  gap: 0.8rem;
  margin-top: 1.2rem;
}

.page-about .about-next-card {
  display: block;
  padding: 1rem;
  background: var(--paper-2);
  border: 1px solid var(--about-rule);
  color: var(--ink);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-next-card:hover,
.page-about .about-next-card:focus-visible {
  border-color: var(--red);
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--sand);
}

.about-next-kicker {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--red-deep);
}

.about-next-card strong {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.12rem;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.about-next-desc {
  display: block;
  margin-top: 0.35rem;
  font-size: 13px;
  line-height: 1.7;
  color: var(--brown);
}

.about-next-foot {
  margin: 1.3rem 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.page-about .about-next-foot a {
  display: inline-block;
  padding-bottom: 0.1rem;
  border-bottom: 2px solid var(--sand);
  color: var(--red-deep);
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-next-foot a:hover,
.page-about .about-next-foot a:focus-visible {
  border-bottom-color: var(--red);
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .about-venue-fields {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.9rem 1.4rem;
  }

  .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .about-partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .about-hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .about-team {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: 1.5rem;
  }

  .about-next-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .about-shell {
    grid-template-columns: 186px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .about-index {
    position: sticky;
    top: calc(var(--header-h) + 1.25rem);
    align-self: start;
  }
}

@media (max-width: 479px) {
  .about-hero h1 {
    font-size: clamp(1.85rem, 8vw, 2.4rem);
  }

  .about-flow-card,
  .about-partner-card {
    padding-left: 0.8rem;
  }
}

@media (hover: none) {
  .about-flow-more {
    max-height: none;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

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

  .about-flow-more {
    max-height: none;
    opacity: 1;
  }
}