.page-about {
  --about-rail: 208px;
  --about-gap: clamp(28px, 4vw, 60px);
  --about-node: clamp(60px, 8vw, 108px);
  --about-axis: 8px;
  --about-step: 5px;
  background: var(--ink);
  color: var(--fog);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(28px, 5vw, 52px) 0 clamp(44px, 6vw, 78px);
  border-bottom: 1px solid var(--line-soft);
  overflow: hidden;
}

.page-about .hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 38%;
  opacity: 0.34;
  filter: saturate(0.68) contrast(1.05);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(180deg, rgba(8, 19, 15, 0.5) 0%, rgba(8, 19, 15, 0.86) 58%, var(--ink) 100%),
    linear-gradient(96deg, rgba(8, 19, 15, 0.94) 6%, rgba(8, 19, 15, 0.24) 74%);
}

.page-about .hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  gap: 16px;
  max-width: 940px;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 6px;
}

.page-about .hero-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .hero-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(34px, 6.4vw, 76px);
  line-height: 1.04;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--fog);
  max-width: 15ch;
}

.page-about .hero-lede {
  margin: 6px 0 0;
  max-width: 46em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--pale);
}

.page-about .hero-index {
  list-style: none;
  margin: clamp(22px, 3.4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line-soft);
}

.page-about .hero-index li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 14px 16px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .hero-index strong {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .hero-index span {
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--mist);
}

/* ---------- 轨道布局 ---------- */
.page-about .track {
  padding: clamp(48px, 7vw, 92px) 0 clamp(48px, 6vw, 80px);
}

.page-about .track-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

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

.page-about .track-body {
  position: relative;
  min-width: 0;
}

/* ---------- 节点 ---------- */
.page-about .node {
  position: relative;
  padding-left: 36px;
  padding-bottom: var(--about-node);
  scroll-margin-top: calc(var(--header-h) + 24px);
  --ndx: 0;
}

.page-about .node:last-child {
  padding-bottom: 0;
}

.page-about .node::before {
  content: "";
  position: absolute;
  left: calc(var(--about-axis) + var(--ndx) * var(--about-step));
  top: 9px;
  width: 9px;
  height: 9px;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(51, 225, 196, 0.14);
}

.page-about .node::after {
  content: "";
  position: absolute;
  left: calc(var(--about-axis) + var(--ndx) * var(--about-step) + 4px);
  top: 26px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--grid) 0%, rgba(42, 74, 63, 0.15) 100%);
}

.page-about .node--last::before {
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(245, 166, 58, 0.16);
}

.page-about .node--last::after {
  display: none;
}

.page-about .node-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  margin-bottom: 18px;
}

.page-about .node-idx {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .node-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.24;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--fog);
}

.page-about .node-lede {
  margin: 0 0 22px;
  max-width: 46em;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--pale);
}

.page-about .node-body p {
  margin: 0 0 1.1em;
  max-width: 46em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

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

/* ---------- 指标网格 ---------- */
.page-about .metric-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  margin-bottom: 26px;
}

.page-about .metric {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 20px 24px;
  background: var(--panel);
}

.page-about .metric-num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .metric--amber .metric-num {
  color: var(--amber);
}

.page-about .metric-unit {
  font-size: 0.6em;
  vertical-align: super;
  margin-left: 2px;
}

.page-about .metric-label {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .metric-name {
  margin: 6px 0 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--fog);
}

.page-about .metric-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 节奏条 ---------- */
.page-about .cadence {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--cyan);
  margin-bottom: 30px;
}

.page-about .cadence-item strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--amber);
  margin-bottom: 4px;
}

.page-about .cadence-item span {
  font-size: 14px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 图片框 ---------- */
.page-about .metric-figure {
  max-width: 720px;
}

.page-about .media-frame figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 团队条形图 ---------- */
.page-about .team-bars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .bar-row {
  padding: 20px 0 18px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .bar-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 10px;
}

.page-about .bar-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .bar-num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .bar-row--last .bar-num {
  color: var(--amber);
}

.page-about .bar-track {
  position: relative;
  height: 6px;
  background: rgba(42, 74, 63, 0.5);
  margin-bottom: 10px;
}

.page-about .bar-fill {
  display: block;
  height: 100%;
  width: var(--w, 0%);
  background: linear-gradient(90deg, var(--cyan) 0%, rgba(51, 225, 196, 0.4) 100%);
}

.page-about .bar-row--last .bar-fill {
  background: linear-gradient(90deg, var(--amber) 0%, rgba(245, 166, 58, 0.4) 100%);
}

.page-about .bar-row:nth-child(1) .bar-fill { --w: 39%; }
.page-about .bar-row:nth-child(2) .bar-fill { --w: 24%; }
.page-about .bar-row:nth-child(3) .bar-fill { --w: 26%; }
.page-about .bar-row:nth-child(4) .bar-fill { --w: 11%; }

.page-about .bar-note {
  margin: 0;
  max-width: 44em;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
  transition: color 0.2s ease;
}

.page-about .bar-row:hover .bar-note,
.page-about .bar-row:focus-within .bar-note {
  color: var(--pale);
}

.page-about .bar-row:hover .bar-fill {
  filter: brightness(1.18);
}

/* ---------- 赛季年表 ---------- */
.page-about .calendar-figure {
  margin-bottom: 32px;
}

.page-about .season-line {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 26px;
}

.page-about .season-item {
  position: relative;
  padding: 2px 0 2px 22px;
  border-left: 1px solid var(--grid);
}

.page-about .season-dot {
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  background: var(--cyan);
}

.page-about .season-item--now .season-dot {
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(245, 166, 58, 0.14);
}

.page-about .season-tag {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .season-name {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.42;
  color: var(--fog);
}

.page-about .season-text {
  margin: 0;
  max-width: 44em;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 合作生态 ---------- */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .partner {
  background: var(--ink-2);
  padding: 24px 20px 26px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .dots {
  height: 64px;
  background-repeat: repeat;
  background-position: 0 0;
  margin-bottom: 6px;
}

.page-about .dots--a {
  width: 112px;
  height: 64px;
  background-image: radial-gradient(circle, var(--cyan) 2.1px, transparent 2.6px);
  background-size: 16px 16px;
}

.page-about .dots--b {
  width: 80px;
  height: 48px;
  background-image: radial-gradient(circle, var(--amber) 2.1px, transparent 2.6px);
  background-size: 16px 16px;
}

.page-about .dots--c {
  width: 48px;
  height: 48px;
  background-image: radial-gradient(circle, var(--pale) 2.1px, transparent 2.6px);
  background-size: 16px 16px;
}

.page-about .partner-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .partner--amber .partner-num {
  color: var(--amber);
}

.page-about .partner-name {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--fog);
}

.page-about .partner-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 评价与进度 ---------- */
.page-about .standing-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .standing-list li {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

.page-about .standing-mark {
  display: block;
  width: 12px;
  height: 12px;
  margin-top: 6px;
  background: var(--cyan);
}

.page-about .standing-mark--amber {
  background: var(--amber);
}

.page-about .standing-mark--idle {
  background: var(--mist);
}

.page-about .standing-name {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--fog);
}

.page-about .standing-list p {
  margin: 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 底部行动区 ---------- */
.page-about .about-cta {
  background: var(--deep);
  border-top: 1px solid var(--line-soft);
  padding: clamp(48px, 7vw, 84px) 0;
}

.page-about .cta-inner {
  display: grid;
  gap: 16px;
  max-width: 900px;
}

.page-about .cta-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.24;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--fog);
}

.page-about .cta-text {
  margin: 0;
  max-width: 44em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .hero-index {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .hero-index li {
    padding-right: 20px;
  }

  .page-about .metric-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .cadence {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .page-about .track-grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 0 var(--about-gap);
  }

  .page-about .track-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-about .rail-head {
    margin: 0 0 14px;
    font-family: var(--font-mono);
    font-size: 11.5px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--mist);
  }

  .page-about .rail-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 2px;
  }

  .page-about .rail-link {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 9px 10px 9px 12px;
    border-left: 2px solid var(--grid);
    color: var(--mist);
    font-size: 14px;
    line-height: 1.4;
    text-decoration: none;
    transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
  }

  .page-about .rail-link:hover,
  .page-about .rail-link:focus-visible {
    color: var(--fog);
    border-left-color: var(--cyan);
    background: rgba(23, 53, 43, 0.45);
    outline: none;
  }

  .page-about .rail-idx {
    font-family: var(--font-mono);
    font-size: 11.5px;
    letter-spacing: 0.12em;
    color: var(--grid);
  }

  .page-about .rail-link:hover .rail-idx,
  .page-about .rail-link:focus-visible .rail-idx {
    color: var(--cyan);
  }

  .page-about .rail-text {
    flex: 1 1 auto;
  }

  .page-about .node:nth-of-type(1) { --ndx: 0; }
  .page-about .node:nth-of-type(2) { --ndx: 1; }
  .page-about .node:nth-of-type(3) { --ndx: 2; }
  .page-about .node:nth-of-type(4) { --ndx: 3; }
  .page-about .node:nth-of-type(5) { --ndx: 4; }
  .page-about .node:nth-of-type(6) { --ndx: 5; }

  .page-about .node {
    padding-left: 52px;
  }

  .page-about .metric-grid {
    grid-template-columns: 1.35fr 1fr 1.15fr 1fr;
  }
}

@media (min-width: 1120px) {
  .page-about .partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .season-item:nth-child(1) { margin-left: 0; }
  .page-about .season-item:nth-child(2) { margin-left: 46px; }
  .page-about .season-item:nth-child(3) { margin-left: 92px; }
  .page-about .season-item:nth-child(4) { margin-left: 138px; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .bar-note,
  .page-about .rail-link {
    transition: none;
  }
}
</