.page-about {
  background: var(--ink-950);
  color: var(--chalk-050);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .about-top {
  padding-top: 26px;
  padding-bottom: 6px;
}
.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--fog-400);
}
.page-about .crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--seam-600);
}
.page-about .crumbs a {
  color: var(--fog-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--ease-out), border-color 180ms var(--ease-out);
}
.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--volt-450);
  border-bottom-color: var(--volt-450);
}
.page-about .crumbs [aria-current="page"] {
  color: var(--chalk-050);
}

/* ---------- 通用文字 ---------- */
.page-about .eyebrow {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--volt-450);
}
.page-about .lede {
  margin: 0;
  max-width: 36em;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--paper-mist);
}
.page-about .prose p {
  margin: 0 0 16px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper-mist);
}
.page-about .prose p:last-child {
  margin-bottom: 0;
}
.page-about .about-inline-link {
  color: var(--volt-450);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(26px, 6vw, 62px) clamp(42px, 8vw, 86px);
  background-image:
    radial-gradient(120% 90% at 100% 0%, rgba(255, 78, 26, 0.16), transparent 58%),
    repeating-linear-gradient(90deg, rgba(44, 58, 82, 0.34) 0 1px, transparent 1px 96px);
}
.page-about .about-hero__inner {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
}
.page-about .about-hero h1 {
  margin: 12px 0 20px;
  font-family: var(--font-display);
  font-size: clamp(34px, 5.6vw, 62px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--chalk-050);
  text-wrap: balance;
}
.page-about .about-hero__stamp {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  margin-top: 28px;
  padding: 12px 18px;
  background: var(--panel-800);
  border: var(--line);
  border-left: 3px solid var(--home-ember);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}
.page-about .about-stamp__val {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--volt-450);
}
.page-about .about-stamp__key {
  font-size: 13px;
  color: var(--fog-400);
}
.page-about .about-hero__figure {
  margin: 0;
  background: var(--panel-800);
  border: var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}
.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.06);
}
.page-about .about-hero__figure figcaption {
  padding: 12px 16px;
  border-top: var(--line);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--fog-400);
}

/* ---------- 编号章节 ---------- */
.page-about .about-chapter {
  display: grid;
  gap: 16px;
  padding-block: clamp(38px, 7vw, 82px);
  border-top: var(--line);
}
.page-about .about-chapter h2,
.page-about .about-band h2,
.page-about .about-next h2 {
  margin: 8px 0 18px;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.005em;
  color: var(--chalk-050);
  text-wrap: balance;
}
.page-about .about-chapter__num {
  display: flex;
  align-items: flex-start;
  padding-left: 14px;
  border-left: 1px solid var(--seam-600);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--volt-450);
}
.page-about .about-chapter__cols {
  display: grid;
  gap: 26px;
}

/* ---------- 主队锚点侧注 ---------- */
.page-about .about-note {
  padding: 18px 20px;
  background: var(--panel-800);
  border: var(--line);
  border-top: 3px solid var(--home-ember);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}
.page-about .about-note__k {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--home-ember);
}
.page-about .about-note__v {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--paper-mist);
}

/* ---------- 时间轴 ---------- */
.page-about .about-band {
  position: relative;
  padding-block: clamp(42px, 8vw, 88px);
  border-top: var(--line);
}
.page-about .about-band--timeline {
  overflow: hidden;
  background: linear-gradient(180deg, var(--night-900), var(--ink-950));
}
.page-about .about-timeline {
  position: relative;
  margin-top: 34px;
}
.page-about .about-timeline__bg {
  display: none;
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.14;
  filter: grayscale(1) contrast(1.15);
  pointer-events: none;
}
.page-about .about-timeline__stops {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 20px;
}
.page-about .about-stop {
  position: relative;
  padding: 0 0 6px 22px;
  border-left: 2px solid var(--seam-600);
  outline: none;
  transition: border-color 200ms var(--ease-out), transform 200ms var(--ease-out);
}
.page-about .about-stop::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--volt-450);
  box-shadow: 0 0 0 5px rgba(51, 242, 196, 0.12);
}
.page-about .about-stop--now {
  border-left-color: var(--volt-450);
}
.page-about .about-stop:hover,
.page-about .about-stop:focus-visible,
.page-about .about-stop:focus-within {
  transform: translateY(-2px);
}
.page-about .about-stop:hover::before,
.page-about .about-stop:focus-visible::before {
  box-shadow: 0 0 0 7px rgba(51, 242, 196, 0.22);
}
.page-about .about-stop__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--volt-450);
}
.page-about .about-stop__phase {
  display: block;
  margin-top: 2px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--fog-400);
}
.page-about .about-stop__body {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--paper-mist);
}

/* ---------- 团队角色 ---------- */
.page-about .about-roles {
  display: grid;
  gap: 12px;
  margin-bottom: 26px;
}
.page-about .about-role {
  position: relative;
  padding: 20px 22px 22px;
  background: var(--panel-800);
  border: var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}
.page-about .about-role__count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--volt-450);
  line-height: 1.1;
}
.page-about .about-role h3 {
  margin: 8px 0 6px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--chalk-050);
}
.page-about .about-role p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--fog-400);
}

/* ---------- 反白章节 ---------- */
.page-about .about-band--paper {
  background: var(--paper-mist);
  color: var(--night-900);
}
.page-about .about-band--paper h2 {
  color: var(--ink-950);
}
.page-about .about-band--paper .eyebrow {
  color: var(--seam-600);
}
.page-about .about-band--paper p {
  color: var(--night-900);
}
.page-about .about-check {
  display: grid;
  gap: 28px;
}
.page-about .about-check__fig {
  margin: 0;
  border: 1px solid rgba(11, 18, 32, 0.22);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}
.page-about .about-check__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}
.page-about .about-check__text > p {
  margin: 0;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.8;
}
.page-about .about-funnel {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}
.page-about .about-funnel__step {
  display: grid;
  gap: 3px;
  padding: 16px 26px 16px 20px;
  clip-path: polygon(0 0, 100% 0, calc(100% - 22px) 100%, 0 100%);
  transition: transform 220ms var(--ease-out);
}
.page-about .about-funnel__step:nth-child(1) {
  width: 100%;
  background: var(--ink-950);
  color: var(--chalk-050);
}
.page-about .about-funnel__step:nth-child(2) {
  width: 86%;
  background: var(--panel-800);
  color: var(--chalk-050);
}
.page-about .about-funnel__step:nth-child(3) {
  width: 72%;
  background: var(--seam-600);
  color: var(--chalk-050);
}
.page-about .about-funnel__step:hover {
  transform: translateX(4px);
}
.page-about .about-funnel__n {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--volt-450);
}
.page-about .about-funnel__step strong {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.page-about .about-funnel__step > span:last-child {
  font-size: 13.5px;
  line-height: 1.66;
  color: var(--paper-mist);
}

/* ---------- 覆盖分布 ---------- */
.page-about .about-coverage {
  margin-top: 26px;
}
.page-about .about-coverage__bar {
  display: flex;
  height: 48px;
  border: var(--line);
  overflow: hidden;
}
.page-about .about-coverage__seg {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}
.page-about .about-coverage__seg + .about-coverage__seg {
  border-left: 1px solid var(--ink-950);
}
.page-about .about-coverage__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--fog-400);
}
.page-about .about-coverage__legend li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.page-about .about-coverage__legend li::before {
  content: "";
  width: 10px;
  height: 10px;
  flex: none;
  background: var(--sw, var(--seam-600));
}

/* ---------- 排班列表 ---------- */
.page-about .about-shift {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--seam-600);
  border: var(--line);
}
.page-about .about-shift li {
  display: grid;
  gap: 4px;
  padding: 15px 18px;
  background: var(--ink-950);
}
.page-about .about-shift__k {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--volt-450);
}
.page-about .about-shift__v {
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--paper-mist);
}

/* ---------- 设计原则 ---------- */
.page-about .about-rules {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 18px;
  border-left: 1px solid var(--seam-600);
  padding-left: 20px;
}
.page-about .about-rule__n {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--home-ember);
}
.page-about .about-rule__t {
  margin: 5px 0 5px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--chalk-050);
}
.page-about .about-rule__d {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--fog-400);
}

/* ---------- 协作数据 ---------- */
.page-about .about-collab {
  display: grid;
  gap: 12px;
  margin: 26px 0;
}
.page-about .about-collab__item {
  padding: 18px 20px;
  background: var(--night-900);
  border: var(--line);
  border-left: 3px solid var(--volt-450);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}
.page-about .about-collab__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.1;
  color: var(--chalk-050);
}
.page-about .about-collab__txt {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--fog-400);
}

/* ---------- 结尾 ---------- */
.page-about .about-next {
  padding-block: clamp(42px, 7vw, 76px);
  border-top: var(--line);
}
.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 滚动显现 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 420ms var(--ease-out), transform 420ms var(--ease-out);
  transition-delay: calc(var(--reveal-i, 0) * 70ms);
}
.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }
  .page-about .about-shift li {
    grid-template-columns: 150px minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
  }
  .page-about .about-collab {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }
  .page-about .about-funnel__step:nth-child(1) { width: 94%; }
  .page-about .about-funnel__step:nth-child(2) { width: 82%; }
  .page-about .about-funnel__step:nth-child(3) { width: 70%; }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1fr) minmax(260px, 372px);
    align-items: start;
    gap: 48px;
  }
  .page-about .about-chapter {
    grid-template-columns: 62px minmax(0, 1fr);
    gap: 42px;
  }
  .page-about .about-chapter__num {
    padding-top: 8px;
  }
  .page-about .about-chapter__num span {
    writing-mode: vertical-rl;
    text-orientation: mixed;
  }
  .page-about .about-chapter__cols {
    grid-template-columns: minmax(0, 1fr) 252px;
    gap: 42px;
    align-items: start;
  }
  .page-about .about-check {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 52px;
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-timeline__bg {
    display: block;
  }
  .page-about .about-timeline__stops {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 18px;
  }
  .page-about .about-stop {
    padding: 26px 4px 0 0;
    border-left: 0;
    border-top: 2px solid var(--seam-600);
  }
  .page-about .about-stop--now {
    border-top-color: var(--volt-450);
  }
  .page-about .about-stop::before {
    left: 0;
    top: -6px;
  }
  .page-about .about-stop__body {
    font-size: 13.5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .page-about .about-stop,
  .page-about .about-funnel__step {
    transition: none;
  }
  .page-about .about-stop:hover,
  .page-about .about-stop:focus-visible,
  .page-about .about-stop:focus-within,
  .page-about .about-funnel__step:hover {
    transform: none;
  }
}
</main>

.page-about {
  --reveal-i: 0.3s;
  --sw: transparent;
}