.page-about {
  --about-aside-w: 296px;
  --about-hair: 1px;
  --about-gap: 56px;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  background:
    radial-gradient(120% 92% at 88% 6%, rgba(242, 201, 76, 0.12), transparent 58%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 100%);
  color: var(--paper);
  padding: 26px 0 56px;
  position: relative;
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: var(--about-hair);
  background: linear-gradient(90deg, var(--gold), rgba(47, 158, 110, 0.6) 42%, transparent);
}

.page-about .about-hero__crumb {
  margin-bottom: 30px;
}

.page-about .about-hero__crumb a,
.page-about .about-hero__crumb li,
.page-about .about-hero__crumb span {
  color: var(--muted);
}

.page-about .about-hero__crumb a:hover {
  color: var(--gold);
}

.page-about .about-hero__crumb [aria-current="page"] {
  color: var(--paper);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(34px, 7.4vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 12px 0 0;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 48ch;
  font-size: 17px;
  line-height: 1.8;
  color: rgba(247, 245, 239, 0.78);
}

.page-about .about-hero__marks {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .about-hero__marks li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding-top: 10px;
  border-top: 2px solid rgba(242, 201, 76, 0.6);
  font-size: 14px;
  color: rgba(247, 245, 239, 0.7);
}

.page-about .about-hero__marks .mono {
  font-size: 18px;
  color: var(--gold);
}

.page-about .about-hero__media {
  margin: 0;
  aspect-ratio: 14 / 9;
  overflow: hidden;
  border: var(--about-hair) solid rgba(217, 169, 58, 0.35);
  background: var(--ink-2);
}

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

/* ============ 米白内容带 ============ */
.page-about .about-band {
  background: var(--paper);
  color: var(--text);
  padding: 52px 0 72px;
}

.page-about .about-shell {
  display: grid;
  gap: 40px;
}

.page-about .about-shell__aside {
  display: grid;
  gap: 24px;
  align-content: start;
}

/* 侧栏索引 —— 移动端横向滑动 */
.page-about .aside-index__label,
.page-about .aside-facts__label {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--green-deep);
  text-transform: uppercase;
}

.page-about .aside-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .aside-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: var(--about-hair) solid var(--line);
  background: #fff;
  color: var(--ink);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .aside-index__link .mono {
  font-size: 12px;
  color: var(--green-deep);
}

.page-about .aside-index__link:hover,
.page-about .aside-index__link:focus-visible {
  border-color: var(--gold);
  color: var(--ink-2);
}

/* 侧栏数据 */
.page-about .aside-facts__list {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--about-hair);
  background: var(--line);
  border: var(--about-hair) solid var(--line);
}

.page-about .aside-facts__row {
  background: var(--paper);
  padding: 12px 14px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 12px;
}

.page-about .aside-facts__row dt {
  font-size: 13px;
  color: var(--muted);
}

.page-about .aside-facts__row dd {
  margin: 0;
  font-size: 15px;
  color: var(--ink);
  padding-bottom: 3px;
  border-bottom: 2px solid var(--gold);
}

/* ============ 通用章节 ============ */
.page-about [id] {
  scroll-margin-top: 88px;
}

.page-about .about-sec + .about-sec {
  margin-top: 48px;
  padding-top: 48px;
  border-top: var(--about-hair) solid var(--line);
}

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

.page-about .about-sec__eyebrow {
  color: var(--green-deep);
  margin: 0;
}

.page-about .about-sec__title {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 8px 0 12px;
}

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

.page-about .vein-divider {
  position: relative;
  height: 2px;
  margin: 34px 0 0;
  background: linear-gradient(90deg, var(--gold-dim), rgba(47, 158, 110, 0.55) 46%, transparent);
}

.page-about .vein-divider::after {
  content: "";
  position: absolute;
  left: 0;
  top: -3px;
  width: 8px;
  height: 8px;
  background: var(--green);
}

/* ============ 时间线 ============ */
.page-about .stages {
  position: relative;
  margin: 32px 0 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .stages::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold), rgba(217, 169, 58, 0.18));
}

.page-about .stage {
  position: relative;
  padding-bottom: 30px;
}

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

.page-about .stage::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--gold-dim);
}

.page-about .stage__period {
  display: inline-block;
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--ink);
  padding-bottom: 3px;
  border-bottom: 2px solid var(--gold);
}

.page-about .stage__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.4vw, 23px);
  line-height: 1.3;
  color: var(--ink);
}

.page-about .stage__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
  max-width: 66ch;
}

.page-about .stage__gain {
  margin: 12px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--green);
  font-size: 14px;
  line-height: 1.7;
  color: var(--green-deep);
  max-width: 62ch;
}

.page-about .stage__gain .mono {
  margin-right: 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--green-deep);
  opacity: 0.8;
}

.page-about .about-timeline-figure {
  margin: 30px 0 0;
  aspect-ratio: 16 / 6;
  overflow: hidden;
  border: var(--about-hair) solid var(--line);
  background: var(--ink);
}

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

/* ============ 四块内容（深色面板） ============ */
.page-about .about-panel--ink {
  background:
    radial-gradient(110% 80% at 92% 0%, rgba(47, 158, 110, 0.14), transparent 60%),
    var(--ink);
  color: var(--paper);
  padding: 32px 20px 36px;
}

.page-about .about-panel__eyebrow {
  color: var(--green);
  margin: 0;
}

.page-about .about-panel--ink .about-sec__title {
  color: var(--paper);
}

.page-about .about-panel--ink .about-sec__lede {
  color: rgba(247, 245, 239, 0.72);
}

.page-about .boards {
  display: grid;
  gap: 16px;
  margin-top: 30px;
}

.page-about .board {
  position: relative;
  background: var(--ink-2);
  border: var(--about-hair) solid rgba(217, 169, 58, 0.3);
  padding: 22px 20px 20px;
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .board:hover,
.page-about .board:focus-within {
  transform: translateY(-6px);
  border-color: var(--gold);
}

.page-about .board__no {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .board__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 21px;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .board__lead {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(247, 245, 239, 0.76);
}

.page-about .board__btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 14px;
  padding: 0;
  background: none;
  border: 0;
  color: var(--green);
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.04em;
  cursor: pointer;
}

.page-about .board__btn::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1;
}

.page-about .board__btn[aria-expanded="true"]::after {
  content: "–";
}

.page-about .board__btn:hover,
.page-about .board__btn:focus-visible {
  color: var(--gold);
}

.page-about .board__detail {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.22s var(--ease);
}

.page-about .board__btn[aria-expanded="true"] ~ .board__detail {
  max-height: 280px;
}

.page-about .board__detail p {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: var(--about-hair) solid rgba(230, 226, 214, 0.16);
  font-size: 14px;
  line-height: 1.75;
  color: rgba(247, 245, 239, 0.64);
}

/* ============ 编辑流程 ============ */
.page-about .flow {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow__item {
  display: grid;
  gap: 8px;
  padding: 18px 0;
  border-top: var(--about-hair) solid var(--line);
}

.page-about .flow__item:last-child {
  border-bottom: var(--about-hair) solid var(--line);
}

.page-about .flow__step {
  margin: 0;
  font-size: 15px;
  letter-spacing: 0.1em;
  color: var(--green-deep);
}

.page-about .flow__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 19px;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .flow__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text);
  max-width: 64ch;
}

.page-about .about-editorial-figure {
  margin: 30px 0 0;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border: var(--about-hair) solid var(--line);
}

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

/* ============ 团队 ============ */
.page-about .team-grid {
  display: grid;
  gap: var(--about-hair);
  margin-top: 30px;
  background: var(--line);
  border: var(--about-hair) solid var(--line);
}

.page-about .stat {
  background: var(--paper);
  padding: 22px 18px;
  transition: background 0.22s var(--ease);
}

.page-about .stat:hover,
.page-about .stat:focus-within {
  background: #fffdf6;
}

.page-about .stat:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: -2px;
}

.page-about .stat__num {
  display: block;
  font-size: 34px;
  line-height: 1;
  color: var(--ink);
  padding-bottom: 6px;
  border-bottom: 2px solid var(--gold);
}

.page-about .stat__num small {
  font-size: 13px;
  margin-left: 5px;
  color: var(--muted);
}

.page-about .stat__label {
  margin: 12px 0 0;
  font-size: 15px;
  color: var(--ink);
}

.page-about .stat__note {
  margin: 10px 0 0;
  padding-top: 10px;
  border-top: var(--about-hair) dashed var(--line);
  font-size: 13.5px;
  line-height: 1.72;
  color: #6b7280;
  opacity: 0.75;
  transition: opacity 0.22s var(--ease), color 0.22s var(--ease);
}

.page-about .stat:hover .stat__note,
.page-about .stat:focus-within .stat__note {
  opacity: 1;
  color: var(--green-deep);
}

/* ============ 会员等级 ============ */
.page-about .levels {
  display: grid;
  gap: 20px;
  margin-top: 30px;
}

.page-about .level {
  border-top: 3px solid var(--line);
  padding-top: 16px;
}

.page-about .level--1 { border-top-color: #c9cfda; }
.page-about .level--2 { border-top-color: var(--green); }
.page-about .level--3 { border-top-color: var(--gold-dim); }
.page-about .level--4 { border-top-color: var(--gold); }

.page-about .level__meta {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .level__name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 21px;
  color: var(--ink);
}

.page-about .level__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text);
}

.page-about .member-strip {
  margin-top: 26px;
  padding: 20px 20px;
  background: #fff;
  border: var(--about-hair) solid var(--line);
  border-left: 3px solid var(--green);
  display: grid;
  gap: 16px;
}

.page-about .member-strip__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text);
}

/* ============ 三项承诺 ============ */
.page-about .promises {
  display: grid;
  gap: 24px;
  margin-top: 30px;
}

.page-about .promise {
  padding-left: 18px;
  border-left: 2px solid var(--gold);
}

.page-about .promise__no {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--ink);
}

.page-about .promise__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .promise__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
}

/* ============ 合作 ============ */
.page-about .join-list {
  display: grid;
  gap: 12px;
  margin-top: 28px;
}

.page-about .join-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px 16px;
  background: #fff;
  border: var(--about-hair) solid var(--line);
  transition: border-color 0.2s var(--ease);
}

.page-about .join-item:hover {
  border-color: var(--gold);
}

.page-about .join-item__tag {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--green-deep);
  border: var(--about-hair) solid rgba(47, 158, 110, 0.45);
  padding: 3px 7px;
  white-space: nowrap;
}

.page-about .join-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text);
}

.page-about .contact-strip {
  margin-top: 28px;
  background: var(--ink-2);
  color: var(--paper);
  padding: 24px 20px;
  display: grid;
  gap: 22px;
}

.page-about .contact-strip__list {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .contact-strip__row {
  display: grid;
  gap: 4px;
}

.page-about .contact-strip__row dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--green);
}

.page-about .contact-strip__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.page-about .contact-strip__note {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(247, 245, 239, 0.7);
}

/* ============ 收尾引导 ============ */
.page-about .about-close {
  background: var(--ink);
  color: var(--paper);
  padding: 52px 0 64px;
}

.page-about .about-close__title {
  font-family: var(--font-display);
  font-size: clamp(22px, 3.2vw, 30px);
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--paper);
}

.page-about .close-grid {
  display: grid;
  gap: var(--about-hair);
  margin-top: 26px;
  background: rgba(230, 226, 214, 0.18);
  border: var(--about-hair) solid rgba(230, 226, 214, 0.18);
}

.page-about .close-link {
  display: block;
  background: var(--ink);
  padding: 22px 18px;
  text-decoration: none;
  transition: background 0.22s var(--ease);
}

.page-about .close-link:hover,
.page-about .close-link:focus-visible {
  background: var(--ink-2);
}

.page-about .close-link__k {
  display: block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .close-link__t {
  display: block;
  margin-top: 8px;
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--paper);
}

.page-about .close-link__d {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

/* ============ 断点 ============ */
@media (min-width: 640px) {
  .page-about .boards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 720px) {
  .page-about .flow__item {
    grid-template-columns: 76px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
  }

  .page-about .flow__step {
    font-size: 17px;
  }

  .page-about .levels {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .promises {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }

  .page-about .member-strip {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 24px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 34px 0 72px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .about-band {
    padding: 64px 0 88px;
  }

  .page-about .about-shell {
    grid-template-columns: minmax(0, 1fr) var(--about-aside-w);
    gap: 64px;
    align-items: start;
  }

  .page-about .about-shell__aside {
    grid-column: 2;
    grid-row: 1;
    position: sticky;
    top: 32px;
  }

  .page-about .about-shell__main {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .aside-index__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-top: var(--about-hair) solid var(--line);
  }

  .page-about .aside-index__link {
    border: 0;
    border-bottom: var(--about-hair) solid var(--line);
    background: transparent;
    padding: 11px 2px;
    width: 100%;
  }

  .page-about .aside-index__link:hover,
  .page-about .aside-index__link:focus-visible {
    background: #fffdf6;
    padding-left: 8px;
  }

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

  .page-about .about-panel--ink {
    padding: 44px 40px 48px;
  }

  .page-about .boards {
    gap: 20px 26px;
  }

  .page-about .board:nth-child(even) {
    margin-top: 30px;
  }

  .page-about .contact-strip {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.8fr);
    gap: 40px;
    padding: 30px 32px;
  }

  .page-about .contact-strip__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 28px;
  }
}

@media (min-width: 1100px) {
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .board,
  .page-about .stat,
  .page-about .close-link,
  .page-about .board__detail {
    transition: none;
  }

  .page-about .board:hover,
  .page-about .board:focus-within {
    transform: none;
  }
}