.page-about {
  counter-reset: about-chapter;
  background: var(--night);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .breadcrumbs {
  padding: 22px 0 0;
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
}

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

.page-about .breadcrumbs a:hover {
  color: var(--cyan);
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

/* ---------- 开场 ---------- */
.page-about .about-open {
  padding: clamp(28px, 5vw, 56px) 0 clamp(44px, 6vw, 84px);
  background: var(--grad-stand);
}

.page-about .about-open__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  align-items: start;
}

.page-about .about-open__lead h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(27px, 5vw, 56px);
  line-height: 1.16;
  letter-spacing: 0.04em;
  max-width: 20ch;
}

.page-about .about-open__lead .lede {
  margin: 20px 0 0;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 40em;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(26px, 4vw, 42px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
  overflow: hidden;
}

.page-about .about-facts__cell {
  display: grid;
  gap: 6px;
  padding: 16px 14px 18px;
  background: var(--grad-panel);
}

.page-about .about-facts__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-facts__label {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-open__batch {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 22px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-open__batch a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-a16);
}

.page-about .about-open__batch a:hover {
  border-bottom-color: var(--cyan);
}

/* 章节索引 */
.page-about .about-index {
  padding: 20px 18px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--grad-panel);
}

.page-about .about-index ol {
  display: grid;
  gap: 0;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line-soft);
  color: var(--mist);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s var(--ease);
}

.page-about .about-index li:last-child a {
  border-bottom: 0;
}

.page-about .about-index a:hover,
.page-about .about-index a[aria-current="true"] {
  color: var(--cyan);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--line);
}

.page-about .about-index a:hover .about-index__num,
.page-about .about-index a[aria-current="true"] .about-index__num {
  color: var(--cyan);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding-block: var(--section-pad);
  border-top: 1px solid var(--line);
}

.page-about .section-head {
  counter-increment: about-chapter;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-bottom: clamp(26px, 3.5vw, 46px);
}

.page-about .chapter-index {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--line);
  transition: color 0.3s var(--ease);
}

.page-about .chapter-index::before {
  content: counter(about-chapter, decimal-leading-zero);
}

.page-about .chapter-index[aria-current="true"] {
  color: var(--cyan);
}

.page-about .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3.2vw, 38px);
  line-height: 1.28;
  letter-spacing: 0.04em;
}

.page-about .section-lede {
  margin: 14px 0 0;
  max-width: 42ch;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .prose {
  max-width: 37em;
}

.page-about .prose p {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

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

.page-about .split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 40px);
}

.page-about .about-note {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
  border-left: 1px solid var(--line);
  padding-left: 14px;
}

/* ---------- 团队分工 ---------- */
.page-about .crew {
  margin-top: clamp(24px, 3vw, 38px);
  border-top: 1px solid var(--line);
}

.page-about .crew__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 18px 0 20px;
  border-bottom: 1px solid var(--line-soft);
  transition: background-color 0.25s var(--ease);
}

.page-about .crew__row:hover {
  background-color: var(--cyan-a08);
}

.page-about .crew__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.05em;
  color: var(--ink);
}

.page-about .crew__desc {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .crew__count {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

/* ---------- 图片 ---------- */
.page-about .shot {
  margin: clamp(28px, 4vw, 52px) 0 0;
}

.page-about .shot img,
.page-about .about-bleed img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--grad-media);
  object-fit: cover;
}

.page-about .shot figcaption,
.page-about .about-bleed figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-bleed {
  margin: 0;
  padding: clamp(20px, 4vw, 48px) 0;
  background: var(--relay);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-bleed img {
  aspect-ratio: 16 / 9;
}

/* ---------- 流程四步 ---------- */
.page-about .flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .flow__step {
  padding: 20px 18px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(18, 58, 82, 0.5) 0%, rgba(5, 19, 31, 0.72) 100%);
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .flow__step:hover {
  background: linear-gradient(160deg, rgba(30, 76, 102, 0.85) 0%, rgba(10, 36, 56, 0.95) 100%);
  border-color: var(--line);
}

.page-about .flow__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .flow__title {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.03em;
}

.page-about .flow__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .about-tl {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--line) 38%, var(--line) 100%);
}

.page-about .about-tl > li {
  position: relative;
}

.page-about .about-tl > li::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 22px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--night);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px var(--cyan-a08);
}

.page-about .tl-toggle {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  width: 100%;
  padding: 16px 0;
  border: 0;
  border-bottom: 1px solid var(--line-soft);
  background: transparent;
  color: var(--ink);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: color 0.2s var(--ease);
}

.page-about .tl-toggle:hover {
  color: var(--cyan);
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(20px, 2.4vw, 26px);
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .tl-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(16px, 1.6vw, 19px);
  letter-spacing: 0.03em;
}

.page-about .tl-hint {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: var(--line);
}

.page-about .tl-toggle:hover .tl-hint {
  color: var(--mint);
}

.page-about .about-tl .disclosure__body {
  max-width: 40em;
  padding: 14px 0 24px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-tl .disclosure__body p {
  margin: 0;
}

.page-about .about-links {
  margin: clamp(26px, 3vw, 40px) 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-links a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-a16);
  margin: 0 3px;
}

.page-about .about-links a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 看台视角 ---------- */
.page-about .stance {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.5vw, 44px);
  align-items: start;
}

.page-about .stance__list {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .stance__list li {
  display: flex;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .stance__dot {
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  margin-top: 10px;
  border-radius: 50%;
  background: var(--mint);
}

.page-about .stance__shot {
  margin-top: 0;
}

/* ---------- 承诺 ---------- */
.page-about .pledge {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .pledge__item {
  padding: 22px 20px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--grad-panel);
}

.page-about .pledge__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(34px, 4.4vw, 48px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .pledge__num small {
  margin-left: 6px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .pledge__title {
  margin: 16px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.04em;
}

.page-about .pledge__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-report {
  margin-top: clamp(26px, 3vw, 42px);
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--coral);
  border-radius: var(--radius);
  background: var(--coral-a12);
}

.page-about .about-report__text {
  margin: 10px 0 0;
  max-width: 46em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-report__text a {
  color: var(--coral);
  text-decoration: none;
  border-bottom: 1px solid var(--coral-a12);
}

.page-about .about-report__text a:hover {
  border-bottom-color: var(--coral);
}

/* ---------- 引用与授权 ---------- */
.page-about .license {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 44px);
}

.page-about .license__title {
  margin: 0 0 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--mint);
}

.page-about .license__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .license__list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .license__list strong {
  display: block;
  margin-bottom: 4px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .license__note {
  margin: 16px 0 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .license__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-a16);
}

.page-about .license__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  margin-top: 18px;
  padding: 0 22px;
  text-decoration: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-open__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(28px, 4vw, 64px);
  }

  .page-about .about-index {
    position: sticky;
    top: 96px;
    align-self: start;
    margin-top: 40px;
  }

  .page-about .section-head {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: clamp(20px, 3vw, 44px);
  }

  .page-about .split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .split__aside {
    margin-top: 52px;
  }

  .page-about .crew__row {
    grid-template-columns: 150px minmax(0, 1fr) 96px;
    align-items: baseline;
    gap: 26px;
    padding: 20px 16px;
  }

  .page-about .crew {
    margin-left: -16px;
    margin-right: -16px;
  }

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

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

  .page-about .stance {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(36px, 5vw, 76px);
  }

  .page-about .stance__shot {
    margin-top: 28px;
  }

  .page-about .license {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .flow__step,
  .page-about .crew__row,
  .page-about .chapter-index,
  .page-about .about-index a {
    transition: none;
  }
}