.page-about {
  --about-gap: clamp(20px, 3vw, 32px);
  --about-section-pad: clamp(52px, 7vw, 96px);
  --about-body: rgba(243, 233, 210, 0.78);
  --about-body-dim: rgba(243, 233, 210, 0.7);
  background: var(--ink);
  color: var(--paper);
  padding-bottom: clamp(56px, 8vw, 104px);
  overflow-x: hidden;
}

.page-about .about-top {
  padding-top: clamp(18px, 3vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(24px, 4vw, 48px) clamp(40px, 6vw, 76px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 12% 0;
  background-image:
    linear-gradient(to right, rgba(143, 167, 155, 0.09) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(143, 167, 155, 0.09) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: linear-gradient(to bottom, #000 10%, transparent 92%);
  mask-image: linear-gradient(to bottom, #000 10%, transparent 92%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-size: clamp(32px, 6.4vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 56ch;
  font-size: clamp(15px, 1.7vw, 17.5px);
  line-height: 1.78;
  color: var(--about-body);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  gap: 16px;
  margin-top: 30px;
  padding-top: 22px;
  border-top: 1px solid var(--line-dark);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.6vw, 44px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 9px;
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-about .about-toc {
  align-self: start;
  padding: 20px 18px;
  background: var(--glass);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.page-about .about-toc__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

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

.page-about .about-toc__list a {
  display: grid;
  grid-template-columns: 2.2rem minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 11px 8px;
  font-size: 14px;
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid rgba(143, 167, 155, 0.16);
  transition: background 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .about-toc__list li:last-child a {
  border-bottom: none;
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  background: rgba(51, 224, 208, 0.12);
  color: var(--cyan);
}

.page-about .about-toc__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--cyan);
}

.page-about .about-toc__go {
  font-size: 12px;
  color: var(--mist);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  position: relative;
  padding-block: var(--about-section-pad);
}

.page-about .about-section + .about-section,
.page-about .about-cta {
  border-top: 1px solid rgba(143, 167, 155, 0.16);
}

.page-about .about-section--paper {
  background: linear-gradient(180deg, rgba(232, 220, 195, 0.07), rgba(232, 220, 195, 0.02));
}

.page-about .about-section--band {
  background: linear-gradient(135deg, rgba(16, 31, 51, 0.92), rgba(11, 22, 38, 0.55));
}

.page-about .about-head {
  display: grid;
  gap: 12px;
  max-width: 66ch;
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .about-head__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--amber);
}

.page-about .about-head h2 {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(25px, 3.9vw, 40px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-head__lede {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-body);
}

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

/* ---------- 对照 ---------- */
.page-about .about-compare {
  display: grid;
  gap: 16px;
}

.page-about .about-compare__col {
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
}

.page-about .about-compare__col--issue {
  background: var(--panel);
  border-color: rgba(232, 93, 63, 0.36);
}

.page-about .about-compare__col--fix {
  background: var(--paper);
  color: var(--paper-ink);
  border-color: transparent;
}

.page-about .about-compare__title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.page-about .about-compare__col--issue .about-compare__title {
  color: var(--coral);
}

.page-about .about-compare__col--fix .about-compare__title {
  color: rgba(36, 26, 22, 0.58);
}

.page-about .about-compare__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-compare__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.72;
}

.page-about .about-compare__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--coral);
}

.page-about .about-compare__col--fix .about-compare__list li {
  color: var(--paper-ink);
}

.page-about .about-compare__col--fix .about-compare__list li::before {
  border-radius: 0;
  background: var(--paper-ink);
}

.page-about .about-compare__col--fix a {
  color: #1c6f63;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-compare__col--issue a {
  color: var(--cyan);
}

/* ---------- 图片容器 ---------- */
.page-about .about-media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  background: var(--panel);
}

.page-about .about-media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-media--4x3 { aspect-ratio: 4 / 3; }
.page-about .about-media--1x1 { aspect-ratio: 1 / 1; }
.page-about .about-media--16x9 { aspect-ratio: 16 / 9; }

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

.page-about .about-figure__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 索引样例 ---------- */
.page-about .about-handbook {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-paper {
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--radius);
}

.page-about .about-paper__kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(36, 26, 22, 0.58);
}

.page-about .about-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.page-about .about-filter {
  padding: 7px 13px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--paper-ink);
  background: transparent;
  border: 1px solid rgba(36, 26, 22, 0.28);
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-filter:hover {
  background: rgba(36, 26, 22, 0.08);
}

.page-about .about-filter[aria-pressed="true"] {
  background: var(--paper-ink);
  border-color: var(--paper-ink);
  color: var(--paper);
}

.page-about .about-index {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-paper);
}

.page-about .about-index__row {
  display: grid;
  grid-template-columns: 2.2rem minmax(0, 1fr) auto;
  gap: 4px 12px;
  align-items: center;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-paper);
}

.page-about .about-index__row.is-hidden,
.page-about .about-index__row[hidden] {
  display: none;
}

.page-about .about-index__no {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: rgba(36, 26, 22, 0.52);
}

.page-about .about-index__body {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.page-about .about-index__body strong {
  font-size: 14.5px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper-ink);
}

.page-about .about-index__body em {
  font-style: normal;
  font-size: 12.5px;
  line-height: 1.5;
  color: rgba(36, 26, 22, 0.6);
}

.page-about .about-index__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  padding: 3px 8px;
  color: var(--paper-ink);
  background: rgba(245, 166, 35, 0.22);
  border: 1px solid rgba(36, 26, 22, 0.28);
  white-space: nowrap;
}

.page-about .about-paper__note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.72;
  color: rgba(36, 26, 22, 0.68);
}

.page-about .about-paper__note a {
  color: #1c6f63;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 分类与校验 ---------- */
.page-about .about-taxonomy {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-cats {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
}

.page-about .about-cats li {
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.03em;
  color: var(--mist);
  border: 1px solid var(--line-dark);
  background: rgba(51, 224, 208, 0.05);
}

.page-about .about-cats li:nth-child(-n + 2) {
  color: var(--cyan);
  border-color: rgba(51, 224, 208, 0.45);
}

.page-about .about-taxonomy__body {
  padding: clamp(20px, 3vw, 30px);
}

.page-about .about-taxonomy__body h3 {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-size: clamp(19px, 2.5vw, 24px);
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-steps li {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr);
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--line-dark);
}

.page-about .about-steps li:first-child {
  padding-top: 0;
  border-top: none;
}

.page-about .about-steps__no {
  font-family: var(--font-mono);
  font-size: 19px;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-steps li strong {
  display: block;
  margin-bottom: 5px;
  font-size: 15.5px;
  color: var(--paper);
}

.page-about .about-steps li p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-body-dim);
}

/* ---------- 团队 ---------- */
.page-about .about-band-media {
  margin-bottom: clamp(22px, 4vw, 34px);
}

.page-about .about-roles {
  display: grid;
  gap: 14px;
}

.page-about .about-role {
  padding: 20px 18px 22px;
  background: var(--panel);
  border: 1px solid var(--line-dark);
  border-top-width: 3px;
  border-radius: var(--radius);
  transition: transform 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .about-role:hover {
  transform: translateY(-4px);
  background: var(--glass);
}

.page-about .about-role--cyan { border-top-color: var(--cyan); }
.page-about .about-role--amber { border-top-color: var(--amber); }
.page-about .about-role--coral { border-top-color: var(--coral); }
.page-about .about-role--mist { border-top-color: var(--mist); }

.page-about .about-role__num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 42px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-role h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-role--amber h3 { color: var(--amber); }
.page-about .about-role--coral h3 { color: var(--coral); }
.page-about .about-role--mist h3 { color: var(--mist); }

.page-about .about-role p:last-child {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--about-body-dim);
}

/* ---------- 时间轴 ---------- */
.page-about .about-stage-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

.page-about .about-stage-jump a {
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  text-decoration: none;
  border: 1px solid rgba(51, 224, 208, 0.4);
  transition: background 0.2s var(--ease);
}

.page-about .about-stage-jump a:hover,
.page-about .about-stage-jump a:focus-visible {
  background: rgba(51, 224, 208, 0.14);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 4px;
  border-left: 2px solid var(--line-dark);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 32px 26px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
}

.page-about .about-timeline__item:last-child::before {
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(51, 224, 208, 0.16);
}

.page-about .about-timeline__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-timeline__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: clamp(17px, 2.2vw, 21px);
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-timeline__item p {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--about-body-dim);
}

/* ---------- 合作生态 ---------- */
.page-about .about-ecosystem {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-eco-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-dark);
}

.page-about .about-eco-list li {
  display: grid;
  grid-template-columns: 2.2rem minmax(0, 1fr);
  gap: 12px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-eco-list__no {
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.9;
  color: var(--cyan);
}

.page-about .about-eco-list li strong {
  display: block;
  margin-bottom: 4px;
  font-size: 15px;
  color: var(--paper);
}

.page-about .about-eco-list__desc {
  display: block;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--about-body-dim);
}

.page-about .about-award {
  padding: clamp(22px, 3vw, 30px);
  border-radius: var(--radius);
}

.page-about .about-award__year {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: rgba(36, 26, 22, 0.58);
}

.page-about .about-award h3 {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: clamp(20px, 2.6vw, 26px);
  line-height: 1.2;
  color: var(--paper-ink);
}

.page-about .about-award p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(36, 26, 22, 0.78);
}

.page-about .about-award__meta {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-paper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: rgba(36, 26, 22, 0.6);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding-block: clamp(44px, 6vw, 76px);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 22px;
  padding: clamp(22px, 4vw, 38px);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  background:
    linear-gradient(120deg, rgba(51, 224, 208, 0.12), rgba(245, 166, 35, 0.09)),
    var(--panel);
}

.page-about .about-cta__text h2 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: clamp(22px, 3.2vw, 32px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 48ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--about-body);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-compare {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

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

@media (min-width: 880px) {
  .page-about .about-taxonomy {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }

  .page-about .about-ecosystem {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .about-cta__links {
    justify-content: flex-end;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, 0.88fr);
    align-items: start;
  }

  .page-about .about-handbook {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .about-roles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-timeline {
    padding-left: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-toc__list a,
  .page-about .about-filter,
  .page-about .about-stage-jump a {
    transition: none;
  }

  .page-about .about-role:hover {
    transform: none;
  }
}