.page-about {
  --about-line: rgba(217, 205, 184, 0.16);
  --about-line-soft: rgba(143, 163, 184, 0.18);
  --about-tone-a: var(--amber);
  --about-tone-b: var(--cyan);
  --about-tone-c: var(--yellow);
  --about-tone-d: var(--green);
  --font-mono-stack: var(--font-mono);
  position: relative;
  color: var(--white);
  font-family: var(--font-body);
  padding-bottom: clamp(58px, 9vw, 118px);
  overflow-x: clip;
}

/* ---------- 顶部上下文 ---------- */
.page-about .about-topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 20px;
  padding-top: clamp(16px, 3vw, 30px);
}

.page-about .about-topbar-note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
  white-space: nowrap;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(26px, 5vw, 58px);
  padding-bottom: clamp(34px, 6vw, 68px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 5px;
  background: linear-gradient(
    90deg,
    var(--cyan) 0 18%,
    var(--yellow) 18% 34%,
    var(--red) 34% 50%,
    var(--green) 50% 66%,
    var(--white) 66% 82%,
    var(--orange) 82% 100%
  );
  clip-path: polygon(0 55%, 100% 0, 100% 100%, 0 100%);
  opacity: 0.9;
}

.page-about .about-hero-copy {
  max-width: 100%;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 7vw, 84px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--white);
  text-wrap: balance;
}

.page-about .about-lead {
  margin: clamp(18px, 3vw, 26px) 0 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: rgba(244, 241, 234, 0.82);
}

.page-about .about-hero-note {
  display: none;
  margin: 0;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--mist);
}

/* 首屏数字 */
.page-about .about-figures {
  list-style: none;
  margin: clamp(28px, 5vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 3vw, 30px);
}

.page-about .about-stat {
  --tone: var(--amber);
  padding-top: 14px;
  border-top: 3px solid var(--tone);
}

.page-about .about-stat:nth-child(2) { --tone: var(--cyan); }
.page-about .about-stat:nth-child(3) { --tone: var(--yellow); }
.page-about .about-stat:nth-child(4) { --tone: var(--green); }

.page-about .about-stat-value {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(32px, 6vw, 52px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--tone);
}

.page-about .about-stat-unit {
  font-family: var(--font-body);
  font-size: clamp(12px, 1.4vw, 14px);
  font-weight: 600;
  color: rgba(244, 241, 234, 0.7);
}

.page-about .about-stat-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding-top: clamp(50px, 8vw, 104px);
}

.page-about .about-sec h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 4.2vw, 44px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--white);
  text-wrap: balance;
}

.page-about .about-idx {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--amber);
  margin-right: 10px;
  letter-spacing: 0.04em;
}

.page-about .section-head {
  max-width: 62ch;
}

.page-about .about-sub {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-sec p {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 241, 234, 0.82);
}

.page-about .about-sec h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(18px, 2.4vw, 23px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--white);
}

/* ---------- 01 双栏交错 ---------- */
.page-about .about-sec--split {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .about-sec-text p {
  margin: 14px 0 0;
}

.page-about .about-points {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-points li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 241, 234, 0.9);
}

.page-about .about-points .dot {
  flex: none;
  margin-top: 8px;
  background: var(--orange);
}

/* ---------- 图片组件 ---------- */
.page-about .about-shot {
  position: relative;
  margin: 0;
}

.page-about .about-shot img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.page-about .about-shot--tall { aspect-ratio: 10 / 13; }
.page-about .about-shot--land { aspect-ratio: 12 / 8; }
.page-about .about-shot--pan { aspect-ratio: 16 / 7; }

.page-about .about-shot .figure-cap {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--mist);
}

/* ---------- 02 分工 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
}

.page-about .about-role {
  --tone: var(--amber);
  position: relative;
  display: grid;
  gap: 12px;
  padding: clamp(20px, 3vw, 30px) 0 clamp(20px, 3vw, 30px) clamp(14px, 2vw, 22px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-role:last-child {
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-role:nth-child(2) { --tone: var(--cyan); }
.page-about .about-role:nth-child(3) { --tone: var(--yellow); }

.page-about .about-role::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: 42px;
  background: var(--tone);
  border-radius: 2px;
}

.page-about .about-role-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
}

.page-about .about-role-num {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 3px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(28px, 4.6vw, 40px);
  line-height: 1;
  color: var(--tone);
}

.page-about .about-role-unit {
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  color: var(--mist);
}

.page-about .about-role-body p {
  margin: 0 0 10px;
}

.page-about .about-role-body p:last-child {
  margin-bottom: 0;
  color: rgba(244, 241, 234, 0.66);
}

/* ---------- 03 流水线 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

.page-about .about-step {
  --tone: var(--cyan);
  position: relative;
  padding-left: clamp(52px, 8vw, 76px);
}

.page-about .about-step:nth-child(2) { --tone: var(--yellow); }
.page-about .about-step:nth-child(3) { --tone: var(--amber); }
.page-about .about-step:nth-child(4) { --tone: var(--green); }

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 2px;
  bottom: 2px;
  width: 3px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--tone), rgba(11, 27, 46, 0));
}

.page-about .about-step-idx {
  position: absolute;
  left: 14px;
  top: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(18px, 2.8vw, 24px);
  line-height: 1.2;
  color: var(--tone);
}

.page-about .about-step h3 {
  margin-bottom: 8px;
}

.page-about .about-step p {
  margin: 0;
}

.page-about .about-flow-shot {
  margin-top: clamp(28px, 5vw, 46px);
}

/* ---------- 04 时间轴 ---------- */
.page-about .about-miles {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: clamp(24px, 3.6vw, 38px);
}

.page-about .about-miles::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(
    180deg,
    var(--cyan),
    var(--yellow) 22%,
    var(--red) 42%,
    var(--green) 62%,
    var(--white) 80%,
    var(--amber)
  );
  opacity: 0.6;
}

.page-about .about-mile {
  --tone: var(--cyan);
  position: relative;
  padding-left: clamp(32px, 5vw, 50px);
}

.page-about .about-mile:nth-child(2) { --tone: var(--yellow); }
.page-about .about-mile:nth-child(3) { --tone: var(--red); }
.page-about .about-mile:nth-child(4) { --tone: var(--green); }
.page-about .about-mile:nth-child(5) { --tone: var(--white); }
.page-about .about-mile:nth-child(6) { --tone: var(--cyan); }
.page-about .about-mile:nth-child(7) { --tone: var(--amber); }

.page-about .about-mile-dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--tone);
  box-shadow: 0 0 0 5px rgba(11, 27, 46, 0.95);
  transition: transform 0.24s var(--ease), box-shadow 0.24s var(--ease);
}

.page-about .about-mile:hover .about-mile-dot,
.page-about .about-mile:focus-within .about-mile-dot {
  transform: scale(1.22);
  box-shadow: 0 0 0 7px rgba(255, 176, 32, 0.16);
}

.page-about .about-mile-phase {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--tone);
  text-transform: uppercase;
}

.page-about .about-mile-body h3 {
  margin-bottom: 8px;
}

.page-about .about-mile-body p {
  margin: 0 0 10px;
}

.page-about .about-mile-key {
  display: inline-block;
  margin: 0;
  padding: 5px 12px;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--amber);
  background: rgba(255, 176, 32, 0.1);
  border: 1px solid rgba(255, 176, 32, 0.28);
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-mile:hover .about-mile-key,
.page-about .about-mile:focus-within .about-mile-key {
  background: rgba(255, 176, 32, 0.2);
  border-color: rgba(255, 176, 32, 0.55);
  transform: translateY(-2px);
}

/* ---------- 05 合作 ---------- */
.page-about .about-partners {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  margin-top: clamp(24px, 4vw, 40px);
}

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

.page-about .about-partner-list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 0;
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-partner-list li:last-child {
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-partner-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(30px, 4.6vw, 42px);
  line-height: 1;
  color: var(--amber);
  min-width: 2.2ch;
}

.page-about .about-partner-name {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: rgba(244, 241, 234, 0.86);
}

.page-about .about-partner-copy p {
  margin: 0 0 14px;
}

.page-about .about-partner-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
  text-decoration: none;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-partner-cta:hover,
.page-about .about-partner-cta:focus-visible {
  transform: translateY(-2px);
}

.page-about .about-shot--pan {
  margin-top: clamp(26px, 4vw, 42px);
}

/* ---------- 06 评选 ---------- */
.page-about .about-awards {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-award {
  --tone: var(--red);
  padding-top: 16px;
  border-top: 3px solid var(--tone);
}

.page-about .about-award + .about-award {
  --tone: var(--cyan);
}

.page-about .about-award-tag {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--tone);
}

.page-about .about-award h3 {
  margin-bottom: 10px;
}

.page-about .about-award p {
  margin: 0;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(56px, 9vw, 112px);
  padding-top: clamp(28px, 4vw, 48px);
  border-top: 1px solid var(--about-line);
  max-width: 62ch;
}

.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.8vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--white);
}

.page-about .about-cta p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-cta-note a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 176, 32, 0.45);
  transition: border-color 0.2s var(--ease);
}

.page-about .about-cta-note a:hover,
.page-about .about-cta-note a:focus-visible {
  border-bottom-color: var(--amber);
}

/* ---------- 章节刻度 ---------- */
.page-about .about-rail {
  display: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-sec p {
    font-size: 16px;
  }

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

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

@media (min-width: 820px) {
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(26px, 4vw, 44px) clamp(28px, 4vw, 52px);
  }

  .page-about .about-partners {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: start;
  }

  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-copy h1 {
    max-width: 16ch;
  }

  .page-about .about-sec--split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: clamp(34px, 5vw, 72px);
  }

  .page-about .about-sec--split .about-shot {
    margin-right: calc(-1 * var(--gutter));
  }

  .page-about .about-role {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: clamp(20px, 3vw, 48px);
    align-items: start;
  }

  .page-about .about-role::before {
    height: 100%;
    max-height: 56px;
  }

  .page-about .about-mile {
    padding-left: clamp(40px, 4vw, 60px);
    max-width: 74ch;
  }

  .page-about .about-shot--pan {
    margin-right: calc(-1 * var(--gutter));
  }

  .page-about .about-awards {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: clamp(30px, 5vw, 64px);
  }

  .page-about .about-award + .about-award {
    margin-top: clamp(24px, 5vw, 56px);
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero {
    padding-right: clamp(60px, 6vw, 90px);
  }

  .page-about .about-hero-note {
    display: block;
    position: absolute;
    top: clamp(70px, 8vw, 96px);
    right: 0;
  }

  .page-about .about-sec h2 {
    max-width: 22ch;
  }
}

@media (min-width: 1240px) {
  .page-about .about-rail {
    display: flex;
    flex-direction: column;
    gap: 16px;
    position: fixed;
    right: 18px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 6;
  }

  .page-about .about-rail a {
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.18em;
    color: var(--mist);
    text-decoration: none;
    padding: 2px 0 2px 4px;
    border-left: 2px solid transparent;
    transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
  }

  .page-about .about-rail a:hover,
  .page-about .about-rail a:focus-visible,
  .page-about .about-rail a[aria-current="true"] {
    color: var(--amber);
    border-left-color: var(--amber);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-mile-dot,
  .page-about .about-mile-key,
  .page-about .about-partner-cta,
  .page-about .about-rail a {
    transition: none;
  }
}