/* ================= page-about ================= */
.page-about {
  --about-hair: rgba(220, 233, 236, 0.12);
  --about-hair-soft: rgba(220, 233, 236, 0.08);
  --about-violet-wash: rgba(110, 91, 255, 0.14);
  position: relative;
  color: var(--text);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: 1.5rem;
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
}

.page-about .about-crumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--text-dim);
}

.page-about .about-crumb li + li::before {
  content: "/";
  margin-right: 0.45rem;
  color: var(--about-hair);
}

.page-about .about-crumb a {
  color: var(--text-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

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

.page-about .about-crumb [aria-current="page"] {
  color: var(--text);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 1.5rem 0 3.25rem;
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -1px 0 0 0;
  z-index: -1;
  background: linear-gradient(112deg, rgba(11, 43, 46, 0.95) 0%, rgba(11, 43, 46, 0.35) 42%, rgba(6, 10, 18, 0) 72%);
  clip-path: polygon(0 0, 78% 0, 44% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(340px, 46vw);
  height: 3px;
  background: linear-gradient(90deg, var(--aqua), var(--lime));
  opacity: 0.75;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
}

.page-about .about-hero__anno {
  margin: 0 0 0.75rem;
  color: var(--aqua);
}

.page-about .about-hero h1 {
  max-width: 20ch;
  margin: 0 0 1.15rem;
  font-size: clamp(2.1rem, 8vw, 4.4rem);
  line-height: 1.06;
  letter-spacing: var(--track-title);
  font-weight: 900;
  color: var(--white);
}

.page-about .about-hero__lede {
  max-width: 62ch;
  margin: 0 0 2rem;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text);
}

.page-about .about-hero__facts {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  grid-template-columns: 1fr;
  background: var(--about-hair-soft);
  border: 1px solid var(--about-hair-soft);
  border-radius: 4px;
  overflow: hidden;
}

.page-about .about-hero__facts .readout {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 1rem 1.1rem;
  background: var(--ink-900);
  transition: background 0.3s var(--ease);
}

.page-about .about-hero__facts .readout:hover {
  background: var(--ink-800);
}

.page-about .about-hero__facts .readout__value {
  font-size: clamp(1.6rem, 7vw, 2.25rem);
  line-height: 1;
  color: var(--lime);
}

.page-about .about-hero__facts .readout__label {
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: 3rem 0;
  scroll-margin-top: calc(var(--bar-h) + 1.5rem);
}

.page-about .about-section + .about-section {
  border-top: 1px solid var(--about-hair-soft);
}

.page-about .section-marker {
  margin-bottom: 1.75rem;
}

.page-about .section-marker__index {
  color: var(--lime);
  text-decoration: none;
  transition: color 0.25s var(--ease);
}

.page-about .section-marker__index:hover,
.page-about .section-marker__index:focus-visible {
  color: var(--aqua);
}

.page-about .section-marker h2 {
  margin: 0.4rem 0 0;
  font-size: clamp(1.45rem, 5.4vw, 2.4rem);
  line-height: 1.22;
  letter-spacing: var(--track-title);
  font-weight: 800;
  color: var(--white);
}

.page-about .about-lead {
  max-width: 58ch;
  margin: -0.75rem 0 1.75rem;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text-dim);
}

/* ---------- 章节 01 起点 ---------- */
.page-about .about-origin {
  display: grid;
  gap: 1.75rem;
}

.page-about .about-origin__text p {
  margin: 0 0 1.15rem;
  font-size: 1rem;
  line-height: 1.95;
  color: var(--text);
}

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

.page-about .about-origin__aside {
  padding: 1.25rem 1.2rem;
  background: var(--ink-900);
  border-left: 2px solid var(--violet);
  border-radius: 0 4px 4px 0;
}

.page-about .about-origin__aside-label {
  margin: 0 0 0.6rem;
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  color: var(--violet-soft);
}

.page-about .about-origin__aside p:not(.about-origin__aside-label) {
  margin: 0 0 1.15rem;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--text-dim);
}

/* ---------- 通栏图 ---------- */
.page-about .about-banner {
  margin: 0 0 2.25rem;
}

.page-about .media-figure__caption {
  margin-top: 0.7rem;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--text-dim);
}

/* ---------- 章节 02 时间线 ---------- */
.page-about .tl-track {
  position: relative;
  display: grid;
  gap: 1.5rem;
  padding-left: 0;
}

.page-about .tl-track::before {
  content: "";
  position: absolute;
  top: 0.5rem;
  bottom: 0.5rem;
  left: 9px;
  width: 2px;
  background: linear-gradient(180deg, var(--ink-800) 0%, var(--ink-800) 62%, var(--lime) 100%);
  border-radius: 2px;
}

.page-about .tl-item {
  position: relative;
  padding: 1.15rem 1.1rem 1.2rem 2.6rem;
  background: var(--ink-900);
  border: 1px solid var(--about-hair-soft);
  border-radius: 4px;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  top: 1.55rem;
  left: 4px;
  width: 12px;
  height: 12px;
  border-radius: 2px;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(183, 255, 59, 0.12);
  transition: background 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .tl-item:hover,
.page-about .tl-item:focus-within {
  transform: translateY(-6px);
  border-color: var(--about-hair);
  background: var(--ink-800);
}

.page-about .tl-item:hover::before {
  background: var(--aqua);
  box-shadow: 0 0 0 6px rgba(36, 224, 200, 0.16);
}

.page-about .tl-item__stage {
  margin: 0 0 0.5rem;
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  color: var(--text-dim);
}

.page-about .tl-item__title {
  margin: 0 0 0.6rem;
  font-size: 1.125rem;
  line-height: 1.35;
  letter-spacing: var(--track-title);
  font-weight: 800;
  color: var(--white);
}

.page-about .tl-item__body {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.9;
  color: var(--text-dim);
}

.page-about .tl-item--now {
  border-color: rgba(183, 255, 59, 0.28);
  background: linear-gradient(150deg, rgba(183, 255, 59, 0.08) 0%, var(--ink-800) 62%);
}

.page-about .tl-item--now .tl-item__title {
  color: var(--lime);
}

.page-about .tl-item--now .tl-item__body {
  color: var(--text);
}

/* ---------- 章节 03 团队 ---------- */
.page-about .about-crew {
  display: grid;
  gap: 1.75rem;
}

.page-about .about-crew__intro {
  margin: 0 0 1.5rem;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text);
}

.page-about .about-roles {
  display: grid;
  gap: 1rem;
  margin: 0 0 1.5rem;
  padding: 0;
  list-style: none;
}

.page-about .about-role {
  position: relative;
  padding: 1.1rem 1.1rem 1.1rem 1.35rem;
  background: var(--ink-900);
  border: 1px solid var(--about-hair-soft);
  border-radius: 4px;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .about-role::before {
  content: "";
  position: absolute;
  top: 1.1rem;
  bottom: 1.1rem;
  left: 0;
  width: 2px;
  background: var(--violet);
  transition: background 0.3s var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  transform: translateY(-6px);
  border-color: var(--about-hair);
}

.page-about .about-role:hover::before,
.page-about .about-role:focus-within::before {
  background: var(--lime);
}

.page-about .about-role__tag {
  margin: 0 0 0.35rem;
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  color: var(--violet-soft);
}

.page-about .about-role h3 {
  margin: 0 0 0.5rem;
  font-size: 1.0625rem;
  line-height: 1.4;
  letter-spacing: 0.04em;
  color: var(--white);
}

.page-about .about-role p {
  margin: 0 0 0.7rem;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-role__rhythm {
  margin: 0 !important;
  padding-top: 0.7rem;
  border-top: 1px solid var(--about-hair-soft);
  font-size: 0.8125rem !important;
  letter-spacing: 0.04em;
  transition: color 0.3s var(--ease);
}

.page-about .about-role:hover .about-role__rhythm,
.page-about .about-role:focus-within .about-role__rhythm {
  color: var(--aqua);
}

.page-about .about-crew__note {
  margin: 0 0 1.5rem;
  padding: 1rem 1.1rem;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--text-dim);
  background: var(--about-violet-wash);
  border-left: 2px solid var(--violet);
  border-radius: 0 4px 4px 0;
}

/* ---------- 章节 04 处理标准 ---------- */
.page-about .about-flow {
  display: block;
  width: 100%;
  height: auto;
  margin: 0 0 2rem;
  overflow: visible;
}

.page-about .about-flow__line {
  stroke: var(--ink-800);
  stroke-width: 2;
}

.page-about .about-flow__node rect {
  fill: var(--ink-900);
  stroke: var(--about-hair);
  stroke-width: 1;
}

.page-about .about-flow__node--live rect {
  fill: rgba(183, 255, 59, 0.08);
  stroke: var(--lime);
}

.page-about .about-flow__num {
  fill: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-anchor: middle;
}

.page-about .about-flow__node--live .about-flow__num {
  fill: var(--lime);
}

.page-about .about-flow__txt {
  fill: var(--text);
  font-size: 15px;
  letter-spacing: 0.06em;
  text-anchor: middle;
}

.page-about .about-standards {
  align-items: stretch;
}

.page-about .about-standard {
  padding: 1.25rem 1.2rem;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .about-standard:hover {
  transform: translateY(-6px);
  border-color: var(--about-hair);
}

.page-about .about-standard__tag {
  margin: 0 0 0.5rem;
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  color: var(--aqua);
}

.page-about .about-standard__tag--alert {
  color: var(--alert);
}

.page-about .about-standard h3 {
  margin: 0 0 0.6rem;
  font-size: 1.0625rem;
  line-height: 1.4;
  letter-spacing: 0.04em;
  color: var(--white);
}

.page-about .about-standard p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.9;
  color: var(--text-dim);
}

/* ---------- 章节 05 本地 ---------- */
.page-about .about-local {
  display: grid;
  gap: 1.75rem;
}

.page-about .about-local__text p {
  margin: 0 0 1.15rem;
  font-size: 1rem;
  line-height: 1.95;
  color: var(--text);
}

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

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

/* ---------- 章节 06 接下来 ---------- */
.page-about .about-ahead {
  display: grid;
  gap: 1rem;
  margin: 0 0 2.25rem;
  padding: 0;
  list-style: none;
}

.page-about .about-ahead__item {
  position: relative;
  padding: 1.2rem 1.15rem 1.2rem 1.15rem;
  background: var(--ink-900);
  border: 1px solid var(--about-hair-soft);
  border-radius: 4px;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .about-ahead__item::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, rgba(36, 224, 200, 0.16), transparent 68%);
  border-radius: 0 4px 0 0;
  pointer-events: none;
}

.page-about .about-ahead__item:hover {
  transform: translateY(-6px);
  border-color: var(--about-hair);
}

.page-about .about-ahead__index {
  margin: 0 0 0.5rem;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-ahead__item h3 {
  margin: 0 0 0.55rem;
  font-size: 1.0625rem;
  line-height: 1.4;
  letter-spacing: 0.04em;
  color: var(--white);
}

.page-about .about-ahead__item p:not(.about-ahead__index) {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.9;
  color: var(--text-dim);
}

.page-about .about-cta {
  padding: 1.5rem 1.25rem;
  background: linear-gradient(140deg, var(--ink-800) 0%, var(--ink-900) 72%);
  border: 1px solid var(--about-hair);
  border-radius: 4px;
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
}

.page-about .about-cta__text {
  margin: 0 0 1.25rem;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text);
}

.page-about .about-cta__text strong {
  color: var(--lime);
  font-weight: 700;
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

/* ================= 中等屏 ================= */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding: 2rem 0 4rem;
  }

  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-section {
    padding: 4rem 0;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-ahead {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ================= 宽屏 ================= */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 2.75rem 0 5rem;
  }

  .page-about .about-origin {
    grid-template-columns: 1fr 21rem;
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-origin__aside {
    position: sticky;
    top: calc(var(--bar-h) + 2rem);
  }

  /* --- 时间线：中线左右交错 --- */
  .page-about .tl-track {
    gap: 3.25rem;
    padding: 0.75rem 0;
  }

  .page-about .tl-track::before {
    left: 50%;
    transform: translateX(-1px);
  }

  .page-about .tl-item {
    width: calc(50% - 3rem);
    padding: 1.4rem 1.35rem;
    background: linear-gradient(160deg, var(--ink-900) 0%, rgba(15, 26, 42, 0.72) 100%);
  }

  .page-about .tl-item::before {
    top: 1.9rem;
  }

  .page-about .tl-item:nth-child(odd) {
    margin-right: auto;
    text-align: right;
  }

  .page-about .tl-item:nth-child(odd)::before {
    left: calc(100% + 42px);
  }

  .page-about .tl-item:nth-child(even) {
    margin-left: auto;
  }

  .page-about .tl-item:nth-child(even)::before {
    right: calc(100% + 42px);
  }

  /* --- 字号随赛季推进缓慢放大 --- */
  .page-about .tl-item:nth-child(1) .tl-item__title { font-size: 1.05rem; }
  .page-about .tl-item:nth-child(2) .tl-item__title { font-size: 1.125rem; }
  .page-about .tl-item:nth-child(3) .tl-item__title { font-size: 1.2rem; }
  .page-about .tl-item:nth-child(4) .tl-item__title { font-size: 1.28rem; }
  .page-about .tl-item:nth-child(5) .tl-item__title { font-size: 1.36rem; }
  .page-about .tl-item:nth-child(6) .tl-item__title { font-size: 1.5rem; }

  /* --- 团队 --- */
  .page-about .about-crew {
    grid-template-columns: 20rem 1fr;
    gap: 2.75rem;
    align-items: start;
  }

  .page-about .about-crew__figure {
    position: sticky;
    top: calc(var(--bar-h) + 2rem);
    margin: 0;
  }

  /* --- 本地球迷 --- */
  .page-about .about-local {
    grid-template-columns: 1fr 22rem;
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-local__figure {
    order: 2;
  }

  /* --- 流程示意 --- */
  .page-about .about-flow {
    max-width: 820px;
    margin-left: auto;
    margin-right: auto;
  }
}

/* ================= 减少动效 ================= */
@media (prefers-reduced-motion: reduce) {
  .page-about .tl-item,
  .page-about .about-role,
  .page-about .about-standard,
  .page-about .about-ahead__item,
  .page-about .about-hero__facts .readout {
    transition: none;
  }

  .page-about .tl-item:hover,
  .page-about .tl-item:focus-within,
  .page-about .about-role:hover,
  .page-about .about-role:focus-within,
  .page-about .about-standard:hover,
  .page-about .about-ahead__item:hover {
    transform: none;
  }
}