.page-about,
.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about {
  --ab-line: rgba(11, 30, 45, 0.18);
  --ab-line-soft: rgba(241, 233, 216, 0.22);
  --ab-paper: #fffdf6;
  --ab-body-ink: #2d404d;
  --ab-shadow: 12px 12px 0 rgba(11, 30, 45, 0.1), 18px 18px 0 rgba(11, 30, 45, 0.05);
  --ab-shadow-cyan: 8px 8px 0 rgba(25, 245, 192, 0.25);
  background: var(--paper-cream);
  color: var(--ink-navy);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
}

.page-about a {
  color: inherit;
  text-decoration: none;
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about section[id] {
  scroll-margin-top: 96px;
}

.page-about .ab-wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gut);
}

.page-about .ab-mono {
  font-family: var(--font-mono);
  font-variant-ligatures: none;
}

.page-about .ab-index {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--clay);
  text-transform: uppercase;
}

.page-about .ab-index--cyan {
  color: var(--pitch-cyan);
}

.page-about .ab-h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 4.2vw, 44px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.012em;
}

.page-about .ab-tag {
  display: inline-block;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .ab-tag--moss {
  background: rgba(95, 127, 90, 0.14);
  border-color: rgba(95, 127, 90, 0.38);
  color: #3f5a3c;
}

.page-about .ab-tag--cyan {
  background: var(--mist-cyan);
  border-color: rgba(25, 245, 192, 0.5);
  color: #0b4a3c;
}

.page-about .ab-tag--clay {
  background: rgba(184, 107, 75, 0.14);
  border-color: rgba(184, 107, 75, 0.38);
  color: #8a4a30;
}

.page-about .ab-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  border: 2px solid transparent;
  border-radius: var(--radius);
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .ab-btn--solid {
  background: var(--amber);
  color: var(--ink-navy);
}

.page-about .ab-btn--solid:hover,
.page-about .ab-btn--solid:focus-visible {
  background: var(--amber-bright);
}

.page-about .ab-btn--line {
  border-color: rgba(25, 245, 192, 0.55);
  color: var(--pitch-cyan);
}

.page-about .ab-btn--line:hover,
.page-about .ab-btn--line:focus-visible {
  background: var(--cyan-soft);
  border-color: var(--pitch-cyan);
}

.page-about .ab-figcap {
  display: flex;
  gap: 10px;
  align-items: baseline;
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--slate-blue);
}

.page-about .ab-figcap .ab-mono {
  color: var(--clay);
  letter-spacing: 0.08em;
}

.page-about .ab-figcap--dark {
  color: var(--cream-70);
}

.page-about .ab-figcap--dark .ab-mono {
  color: var(--pitch-cyan);
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  padding: clamp(96px, 13vw, 150px) 0 clamp(64px, 9vw, 104px);
  background-color: var(--ink-navy);
  background-image:
    repeating-linear-gradient(90deg, rgba(94, 127, 146, 0.16) 0 1px, transparent 1px 76px),
    repeating-linear-gradient(0deg, rgba(94, 127, 146, 0.1) 0 1px, transparent 1px 76px);
  color: var(--paper-cream);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 44px), 0 100%);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 26px;
  width: min(46%, 420px);
  height: 2px;
  background: linear-gradient(90deg, var(--pitch-cyan), rgba(25, 245, 192, 0));
}

.page-about .ab-crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 0 0 clamp(24px, 4vw, 40px);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cream-70);
}

.page-about .ab-crumbs li + li::before {
  content: "/";
  margin: 0 10px;
  color: var(--line-blue);
}

.page-about .ab-crumbs a {
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .ab-crumbs a:hover,
.page-about .ab-crumbs a:focus-visible {
  color: var(--pitch-cyan);
  border-bottom-color: var(--pitch-cyan);
}

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

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(30px, 5vw, 52px);
}

.page-about .ab-kicker {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--pitch-cyan);
}

.page-about .ab-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(42px, 9vw, 92px);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: -0.03em;
}

.page-about .ab-hero__title em {
  font-style: normal;
  color: var(--pitch-cyan);
}

.page-about .ab-hero__lede {
  max-width: 34em;
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.62;
  color: var(--cream-80);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.5vw, 32px);
}

.page-about .ab-hero__note {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: clamp(22px, 3vw, 30px);
  padding: 10px 14px;
  font-size: 13.5px;
  color: var(--cream-70);
  border: 1px solid rgba(241, 233, 216, 0.22);
  border-left: 3px solid var(--amber);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .ab-hero__note-year {
  color: var(--amber);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.page-about .ab-hero__note:hover,
.page-about .ab-hero__note:focus-visible {
  color: var(--paper-cream);
  background: rgba(41, 70, 91, 0.6);
  border-left-color: var(--amber-bright);
}

.page-about .ab-hero__figure {
  margin: 0;
}

.page-about .ab-hero__figure img {
  width: 100%;
  border: 2px solid var(--line-blue);
  box-shadow: 10px 10px 0 rgba(25, 245, 192, 0.16);
}

/* ---------- 页内目录 ---------- */

.page-about .ab-jump {
  background: var(--slate-blue);
  color: var(--paper-cream);
  border-bottom: 2px solid rgba(25, 245, 192, 0.28);
}

.page-about .ab-jump__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 20px;
  padding-block: 14px;
}

.page-about .ab-jump__label {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--pitch-cyan);
}

.page-about .ab-jump ul {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12.5px;
}

.page-about .ab-jump a {
  display: inline-block;
  padding-bottom: 3px;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .ab-jump a:hover,
.page-about .ab-jump a:focus-visible {
  color: var(--pitch-cyan);
  border-bottom-color: var(--pitch-cyan);
}

/* ---------- 通用章节 ---------- */

.page-about .ab-section {
  padding: clamp(48px, 8vw, 96px) 0;
}

.page-about .ab-split {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .ab-side-note {
  margin: 18px 0 0;
  padding-left: 14px;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--ab-body-ink);
  border-left: 3px solid var(--moss-green);
}

.page-about .ab-lead {
  margin: 0;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 600;
  line-height: 1.55;
  letter-spacing: -0.005em;
}

.page-about .ab-split__body > p + p {
  margin-top: 16px;
}

.page-about .ab-split__body p {
  color: var(--ab-body-ink);
}

.page-about .ab-split__body .ab-lead {
  color: var(--ink-navy);
}

/* ---------- 品牌主张 ---------- */

.page-about .ab-personas {
  display: grid;
  gap: 12px;
  margin: clamp(26px, 4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-personas li {
  padding: 16px 18px;
  background: var(--ab-paper);
  border: 1px solid var(--ab-line);
  border-left: 3px solid var(--moss-green);
  box-shadow: 5px 5px 0 rgba(11, 30, 45, 0.06);
}

.page-about .ab-personas li:nth-child(2) {
  border-left-color: var(--pitch-cyan);
}

.page-about .ab-personas li:nth-child(3) {
  border-left-color: var(--clay);
}

.page-about .ab-personas p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.6;
}

.page-about .ab-stats {
  display: grid;
  gap: 1px;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 1px;
  list-style: none;
  background: var(--ab-line);
  border: 2px solid var(--ab-line);
}

.page-about .ab-stats li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 16px;
  background: var(--paper-cream);
}

.page-about .ab-num {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink-navy);
}

.page-about .ab-stat-label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--slate-blue);
}

/* ---------- 治理方法 ---------- */

.page-about .ab-sec-method {
  background: linear-gradient(180deg, rgba(241, 233, 216, 0) 0%, rgba(215, 255, 244, 0.35) 100%);
}

.page-about .ab-head {
  max-width: 46em;
}

.page-about .ab-head__lede {
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.65;
  color: var(--ab-body-ink);
}

.page-about .ab-head--dark .ab-head__lede {
  color: var(--cream-70);
}

.page-about .ab-methods {
  display: grid;
  gap: 16px;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-method {
  position: relative;
  padding: 22px 20px 20px;
  background: var(--ab-paper);
  border: 2px solid var(--ab-line);
  border-radius: var(--radius);
  box-shadow: 6px 6px 0 rgba(11, 30, 45, 0.07);
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .ab-method:hover,
.page-about .ab-method:focus-within {
  border-color: var(--pitch-cyan);
  box-shadow: var(--ab-shadow-cyan);
  transform: translate(-2px, -2px);
}

.page-about .ab-method__no {
  display: block;
  margin-bottom: 10px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--clay);
}

.page-about .ab-method h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  line-height: 1.3;
}

.page-about .ab-method p {
  margin: 0 0 14px;
  font-size: 14.8px;
  line-height: 1.65;
  color: var(--ab-body-ink);
}

.page-about .ab-method:hover .ab-tag--moss {
  background: rgba(25, 245, 192, 0.18);
  border-color: rgba(25, 245, 192, 0.6);
  color: #0b4a3c;
}

/* ---------- 版本历程 ---------- */

.page-about .ab-sec-time {
  background-color: var(--ink-navy);
  background-image: repeating-linear-gradient(82deg, rgba(94, 127, 146, 0.12) 0 1px, transparent 1px 118px);
  color: var(--paper-cream);
}

.page-about .ab-sec-time .ab-h2 {
  color: var(--paper-cream);
}

.page-about .ab-time__grid {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .ab-timeline {
  position: relative;
  display: grid;
  gap: 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--pitch-cyan) 0%, rgba(25, 245, 192, 0.12) 100%);
}

.page-about .ab-node {
  position: relative;
  padding-left: 34px;
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 16px;
  height: 16px;
  background: var(--ink-navy);
  border: 2px solid var(--pitch-cyan);
  border-radius: 50%;
  transition: background 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .ab-node:hover::before,
.page-about .ab-node:focus-within::before {
  background: var(--pitch-cyan);
  box-shadow: 0 0 0 7px rgba(25, 245, 192, 0.16);
}

.page-about .ab-node__year {
  display: inline-block;
  margin-bottom: 6px;
  padding: 2px 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-navy);
  background: var(--amber);
}

.page-about .ab-node h3 {
  margin: 8px 0 6px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 800;
  line-height: 1.3;
  color: var(--paper-cream);
}

.page-about .ab-node p {
  margin: 0;
  max-width: 40em;
  font-size: 14.8px;
  line-height: 1.68;
  color: var(--cream-70);
}

.page-about .ab-time__figure {
  margin: 0;
}

.page-about .ab-time__figure img {
  width: 100%;
  border: 2px solid rgba(25, 245, 192, 0.3);
}

.page-about .ab-revise {
  margin-top: clamp(30px, 5vw, 52px);
  padding: clamp(20px, 3vw, 28px);
  background: rgba(41, 70, 91, 0.5);
  border: 2px solid rgba(25, 245, 192, 0.28);
  border-left: 4px solid var(--amber);
}

.page-about .ab-revise h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 800;
  color: var(--paper-cream);
}

.page-about .ab-revise ol {
  display: grid;
  gap: 12px 20px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-revise li {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding-top: 10px;
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--cream-80);
  border-top: 2px solid var(--amber);
}

.page-about .ab-revise .ab-mono {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--amber-bright);
}

/* ---------- 维护团队 ---------- */

.page-about .ab-roles {
  display: grid;
  gap: 10px;
  margin-top: clamp(24px, 3.5vw, 32px);
}

.page-about .ab-role {
  background: var(--ab-paper);
  border: 2px solid var(--ab-line);
  border-radius: var(--radius);
  transition: border-color 0.2s var(--ease);
}

.page-about .ab-role[open] {
  border-color: var(--moss-green);
}

.page-about .ab-role summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  cursor: pointer;
  list-style: none;
  transition: background 0.2s var(--ease);
}

.page-about .ab-role summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-role summary::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--clay);
}

.page-about .ab-role[open] summary::after {
  content: "－";
}

.page-about .ab-role summary:hover,
.page-about .ab-role summary:focus-visible {
  background: var(--mist-cyan);
}

.page-about .ab-role__id {
  padding: 3px 8px;
  font-size: 12px;
  color: var(--paper-cream);
  background: var(--moss-green);
}

.page-about .ab-role p {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--ab-body-ink);
}

.page-about .ab-cadence {
  margin: 22px 0 0;
  padding: 16px 18px;
  font-size: 14.5px;
  line-height: 1.66;
  color: var(--ab-body-ink);
  background: rgba(184, 107, 75, 0.1);
  border-left: 3px solid var(--clay);
}

.page-about .ab-team__figure {
  margin: 0;
}

.page-about .ab-team__figure img {
  width: 100%;
  border: 2px solid var(--ab-line);
  box-shadow: var(--ab-shadow);
}

/* ---------- 联系与下一步 ---------- */

.page-about .ab-sec-talk {
  background: var(--ink-navy);
  color: var(--paper-cream);
}

.page-about .ab-sec-talk .ab-h2 {
  color: var(--paper-cream);
}

.page-about .ab-talk {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
}

.page-about .ab-talk__main > p {
  margin: 14px 0 0;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.65;
  color: var(--cream-70);
}

.page-about .ab-links {
  display: grid;
  gap: 0;
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .ab-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  font-size: 15.5px;
  color: var(--paper-cream);
  border-bottom: 1px solid var(--ab-line-soft);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), padding-left 0.2s var(--ease);
}

.page-about .ab-link span {
  font-family: var(--font-mono);
  color: var(--pitch-cyan);
}

.page-about .ab-link:hover,
.page-about .ab-link:focus-visible {
  color: var(--pitch-cyan);
  border-bottom-color: var(--pitch-cyan);
  padding-left: 6px;
}

.page-about .ab-contact {
  padding: clamp(20px, 3vw, 28px);
  background: rgba(41, 70, 91, 0.55);
  border: 2px solid rgba(25, 245, 192, 0.28);
  box-shadow: 10px 10px 0 rgba(25, 245, 192, 0.1);
}

.page-about .ab-contact h3 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.2vw, 21px);
  font-weight: 800;
  line-height: 1.3;
  color: var(--paper-cream);
}

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

.page-about .ab-contact dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--pitch-cyan);
}

.page-about .ab-contact dd {
  margin: 4px 0 0;
  font-size: 15px;
  line-height: 1.55;
  color: var(--cream-90);
  word-break: break-word;
}

.page-about .ab-contact__note {
  margin: 18px 0 20px;
  font-size: 13.5px;
  line-height: 1.62;
  color: var(--cream-70);
}

/* ---------- 响应式 ---------- */

@media (min-width: 560px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .ab-personas {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .ab-method:first-child {
    grid-column: 1 / -1;
    padding: 26px 24px 22px;
  }
}

@media (min-width: 880px) {
  .page-about .ab-split {
    grid-template-columns: minmax(0, 0.36fr) minmax(0, 0.64fr);
    align-items: start;
  }

  .page-about .ab-split--team {
    grid-template-columns: minmax(0, 0.62fr) minmax(0, 0.38fr);
    align-items: start;
  }

  .page-about .ab-split__side {
    position: sticky;
    top: 104px;
  }

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: end;
  }

  .page-about .ab-stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .ab-revise ol {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .ab-time__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
  }

  .page-about .ab-time__figure {
    position: sticky;
    top: 112px;
  }

  .page-about .ab-node:nth-child(2) {
    margin-left: 7%;
  }

  .page-about .ab-node:nth-child(4) {
    margin-left: 14%;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-btn,
  .page-about .ab-method,
  .page-about .ab-node::before,
  .page-about .ab-link,
  .page-about .ab-role summary,
  .page-about .ab-hero__note,
  .page-about .ab-jump a,
  .page-about .ab-crumbs a {
    transition: none;
  }

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

  .page-about .ab-link:hover,
  .page-about .ab-link:focus-visible {
    padding-left: 0;
  }
}