.page-about {
  background: var(--ink);
  color: var(--silver);
  font-family: var(--font-body);
  line-height: 1.85;
  overflow-x: hidden;
}

.page-about a {
  color: inherit;
}

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

.page-about .about-split {
  display: grid;
  gap: clamp(28px, 5vw, 48px);
}

@media (min-width: 880px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  padding: clamp(18px, 3vw, 32px) 0 clamp(44px, 7vw, 92px);
  background:
    radial-gradient(92% 72% at 86% 4%, rgba(242, 166, 90, 0.18), transparent 62%),
    radial-gradient(64% 52% at 4% 96%, rgba(111, 175, 158, 0.1), transparent 70%),
    var(--ink);
  border-bottom: 1px solid var(--line);
}

.page-about .about-cover__crumb {
  margin-bottom: clamp(28px, 5vw, 56px);
  font-size: var(--step-note);
  color: var(--silver-dim);
}

.page-about .about-cover__crumb a {
  color: var(--silver-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-cover__crumb a:hover,
.page-about .about-cover__crumb a:focus-visible {
  color: var(--amber-soft);
  border-color: var(--amber);
}

.page-about .about-cover__grid {
  display: grid;
  gap: clamp(28px, 5vw, 48px);
  align-items: end;
}

@media (min-width: 900px) {
  .page-about .about-cover__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(32px, 5vw, 72px);
  }
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: var(--step-mono);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
  margin: 0 0 0.9em;
}

.page-about .about-cover h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.05rem, 6.4vw, 3.6rem);
  line-height: 1.16;
  letter-spacing: 0.01em;
  color: var(--mist);
  margin: 0 0 0.55em;
}

.page-about .about-cover__dek {
  max-width: 33em;
  font-size: clamp(1rem, 2vw, 1.125rem);
  line-height: 1.95;
  color: var(--silver);
  margin: 0;
}

.page-about .about-cover__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.72em 1.4em;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-size: 0.95rem;
  font-family: var(--font-body);
  text-decoration: none;
  line-height: 1.4;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.page-about .btn--amber {
  background: var(--amber);
  color: var(--ink);
  font-weight: 600;
}

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

.page-about .btn--ghost {
  border-color: var(--line-strong);
  color: var(--mist);
}

.page-about .btn--ghost:hover,
.page-about .btn--ghost:focus-visible {
  border-color: var(--amber);
  color: var(--amber-soft);
}

.page-about .btn:focus-visible,
.page-about .about-tl__pill:focus-visible,
.page-about .about-fold summary:focus-visible {
  outline: 2px solid var(--amber-soft);
  outline-offset: 3px;
}

/* ---------- 概况面板 ---------- */
.page-about .about-facts {
  position: relative;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: clamp(20px, 3vw, 28px);
  overflow: hidden;
}

.page-about .about-facts::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--amber), rgba(242, 166, 90, 0.1));
}

.page-about .about-facts__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--step-mono);
  letter-spacing: 0.16em;
  color: var(--silver-dim);
  text-transform: uppercase;
}

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

.page-about .about-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--line);
}

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

.page-about .about-facts__row dt {
  font-size: var(--step-note);
  color: var(--silver-dim);
}

.page-about .about-facts__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.02rem;
  color: var(--amber-soft);
}

/* ---------- 章节标题 ---------- */
.page-about .about-head {
  max-width: 42rem;
  margin-bottom: clamp(22px, 3.5vw, 36px);
}

.page-about .about-head h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.45rem, 3.6vw, 2.1rem);
  line-height: 1.32;
  color: var(--mist);
  margin: 0 0 0.45em;
}

.page-about .about-head__dek {
  margin: 0;
  font-size: var(--step-note);
  color: var(--silver-dim);
  line-height: 1.8;
}

.page-about .prose p {
  margin: 0 0 1.05em;
  font-size: clamp(1rem, 1.6vw, 1.0625rem);
  line-height: 1.9;
  color: var(--silver);
}

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

/* ---------- 起点 ---------- */
.page-about .about-origin {
  border-bottom: 1px solid var(--line);
}

.page-about .about-quote {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: clamp(20px, 3vw, 30px);
  background: var(--paper);
  color: var(--brown);
  border-left: 3px solid var(--amber);
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 2vw, 1.28rem);
  line-height: 1.72;
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink-2);
}

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

.page-about .about-figure figcaption {
  padding: 12px 18px 15px;
  font-size: var(--step-note);
  line-height: 1.7;
  color: var(--silver-dim);
  border-top: 1px solid var(--line);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-timeline {
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink) 55%, rgba(21, 28, 61, 0.55) 100%);
}

.page-about .about-tl__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 clamp(26px, 4vw, 40px);
}

.page-about .about-tl__pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px 8px 10px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  font-size: var(--step-note);
  color: var(--silver);
  text-decoration: none;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-tl__pill:hover,
.page-about .about-tl__pill:focus-visible {
  border-color: var(--amber);
  color: var(--amber-soft);
  background: rgba(242, 166, 90, 0.08);
}

.page-about .about-tl__pill-year {
  font-family: var(--font-mono);
  font-size: var(--step-mono);
  color: var(--amber);
  background: rgba(242, 166, 90, 0.12);
  border-radius: var(--radius-pill);
  padding: 3px 9px;
}

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

.page-about .about-tl__row {
  display: grid;
  gap: 10px;
  padding: clamp(22px, 3.4vw, 34px) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 120px;
}

@media (min-width: 820px) {
  .page-about .about-tl__row {
    grid-template-columns: clamp(140px, 16vw, 200px) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 64px);
  }
}

.page-about .about-tl__year {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
}

.page-about .about-tl__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--silver-dim);
  box-shadow: 0 0 0 4px rgba(201, 209, 227, 0.1);
  flex: none;
}

.page-about .about-tl__dot--now {
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(242, 166, 90, 0.18), 0 0 18px rgba(242, 166, 90, 0.55);
}

.page-about .about-tl__year-num {
  font-size: 1.05rem;
  color: var(--amber-soft);
  letter-spacing: 0.04em;
}

.page-about .about-tl__year-ver {
  font-size: var(--step-mono);
  color: var(--silver-dim);
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  padding: 1px 8px;
}

.page-about .about-tl__body h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.12rem, 2.2vw, 1.32rem);
  color: var(--mist);
  margin: 0 0 0.6em;
  line-height: 1.45;
}

.page-about .about-tl__body p {
  margin: 0 0 0.95em;
  font-size: clamp(1rem, 1.6vw, 1.0625rem);
  line-height: 1.9;
  color: var(--silver);
}

.page-about .about-tl__note {
  font-size: var(--step-note);
  color: var(--silver-dim);
  border-left: 2px solid var(--jade);
  padding-left: 14px;
  margin-bottom: 0 !important;
}

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

/* ---------- 编辑方法与栏目（奶油纸） ---------- */
.page-about .about-method {
  background: var(--paper);
  color: var(--brown);
}

.page-about .about-method .about-split {
  align-items: start;
}

.page-about .about-method .about-head h2 {
  color: var(--brown);
}

.page-about .about-eyebrow--rust {
  color: var(--rust);
}

.page-about .about-method .prose p {
  color: rgba(42, 29, 24, 0.86);
}

.page-about .about-method__top .about-head {
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .about-index {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-paper);
}

.page-about .about-index__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line-paper);
}

@media (min-width: 780px) {
  .page-about .about-index {
    grid-template-columns: 1fr 1fr;
    column-gap: clamp(28px, 4vw, 56px);
  }
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: var(--step-mono);
  color: var(--rust);
  padding-top: 0.45em;
  letter-spacing: 0.06em;
}

.page-about .about-index__name {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--brown);
  margin: 0 0 0.25em;
  line-height: 1.5;
}

.page-about .about-index__desc {
  margin: 0;
  font-size: var(--step-note);
  line-height: 1.75;
  color: rgba(42, 29, 24, 0.74);
}

.page-about .about-method__bottom {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  margin-top: clamp(28px, 4vw, 44px);
}

@media (min-width: 880px) {
  .page-about .about-method__bottom {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
    gap: clamp(32px, 5vw, 64px);
  }
}

.page-about .about-fold {
  background: var(--paper-2);
  border: 1px solid var(--line-paper);
  border-radius: var(--radius-md);
  padding: 16px 18px;
}

.page-about .about-fold summary {
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--brown);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 10px;
}

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

.page-about .about-fold summary::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--jade);
  flex: none;
  transition: box-shadow 0.2s ease;
}

.page-about .about-fold[open] summary::before {
  box-shadow: 0 0 0 4px rgba(111, 175, 158, 0.25);
}

.page-about .about-fold__body {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--line-paper);
}

.page-about .about-fold__body p {
  margin: 0 0 0.85em;
  font-size: var(--step-note);
  line-height: 1.85;
  color: rgba(42, 29, 24, 0.8);
}

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

.page-about .about-method__figure {
  border-color: var(--line-paper);
  background: var(--paper-2);
}

.page-about .about-method__figure figcaption {
  border-top-color: var(--line-paper);
  color: rgba(42, 29, 24, 0.7);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  border-bottom: 1px solid var(--line);
}

.page-about .about-team__grid {
  display: grid;
  gap: 16px;
}

@media (min-width: 760px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-team__card:nth-child(1) {
    grid-column: span 7;
  }

  .page-about .about-team__card:nth-child(2) {
    grid-column: span 5;
  }

  .page-about .about-team__card:nth-child(3) {
    grid-column: span 5;
  }

  .page-about .about-team__card:nth-child(4) {
    grid-column: span 7;
  }
}

.page-about .about-team__card {
  position: relative;
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  transition: border-color 0.22s ease, box-shadow 0.22s ease, transform 0.22s ease;
}

.page-about .about-team__card:hover,
.page-about .about-team__card:focus-within {
  border-color: rgba(242, 166, 90, 0.55);
  box-shadow: 0 0 0 1px rgba(242, 166, 90, 0.18), 0 14px 32px rgba(0, 0, 0, 0.28);
  transform: translateY(-2px);
}

.page-about .about-team__role {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: var(--step-mono);
  letter-spacing: 0.14em;
  color: var(--silver-dim);
}

.page-about .about-team__count {
  margin: 0 0 10px;
  font-size: var(--step-note);
  color: var(--silver-dim);
}

.page-about .about-team__num {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4vw, 2.5rem);
  line-height: 1.1;
  color: var(--amber-soft);
  margin-right: 4px;
}

.page-about .about-team__desc {
  margin: 0 0 18px;
  font-size: var(--step-note);
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-team__bar {
  height: 4px;
  border-radius: var(--radius-pill);
  background: rgba(201, 209, 227, 0.14);
  overflow: hidden;
}

.page-about .about-team__fill {
  display: block;
  height: 100%;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--amber), var(--amber-soft));
}

.page-about .about-team__card:nth-child(1) .about-team__fill {
  width: 38.5%;
}

.page-about .about-team__card:nth-child(2) .about-team__fill {
  width: 27%;
}

.page-about .about-team__card:nth-child(3) .about-team__fill {
  width: 19.2%;
}

.page-about .about-team__card:nth-child(4) .about-team__fill {
  width: 15.4%;
}

/* ---------- 合作与荣誉 ---------- */
.page-about .about-coop {
  background: linear-gradient(180deg, rgba(21, 28, 61, 0.65), var(--ink) 78%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-coop__list {
  margin: clamp(20px, 3vw, 30px) 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-coop__row {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-coop__row dt {
  font-family: var(--font-mono);
  font-size: var(--step-mono);
  letter-spacing: 0.12em;
  color: var(--silver-dim);
  margin-bottom: 4px;
}

.page-about .about-coop__row dd {
  margin: 0;
  font-size: var(--step-note);
  color: var(--mist);
}

.page-about .about-coop__num {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--amber);
  margin-right: 4px;
}

.page-about .about-coop__note {
  margin: 6px 0 0;
  font-size: var(--step-note);
  line-height: 1.75;
  color: var(--silver-dim);
}

.page-about .about-coop__aside {
  display: grid;
  gap: 16px;
}

.page-about .about-coop__panel {
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: clamp(18px, 2.6vw, 26px);
}

.page-about .about-coop__panel-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--step-mono);
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-coop__panel-text {
  margin: 0 0 0.8em;
  font-size: var(--step-note);
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-coop__panel-text:last-child {
  margin-bottom: 0;
}

.page-about .about-honor {
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-lg);
}

.page-about .about-honor__title {
  margin: 0 0 10px;
  font-size: var(--step-note);
  color: var(--silver-dim);
}

.page-about .about-honor__list {
  list-style: none;
  margin: 0 0 10px;
  padding: 0;
}

.page-about .about-honor__item {
  padding: 9px 0 9px 18px;
  border-bottom: 1px solid var(--line);
  font-size: var(--step-note);
  color: var(--mist);
  position: relative;
}

.page-about .about-honor__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.15em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--rust);
}

.page-about .about-honor__item:last-child {
  border-bottom: 0;
}

.page-about .about-honor__note {
  margin: 0;
  font-size: var(--step-mono);
  line-height: 1.8;
  color: var(--silver-dim);
}

/* ---------- 联系 ---------- */
.page-about .about-contact__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

@media (min-width: 880px) {
  .page-about .about-contact__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
    gap: clamp(32px, 5vw, 72px);
  }
}

.page-about .about-contact h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.45rem, 3.6vw, 2.05rem);
  line-height: 1.32;
  color: var(--mist);
  margin: 0 0 0.5em;
}

.page-about .about-contact__lead {
  margin: 0 0 clamp(20px, 3vw, 28px);
  font-size: clamp(1rem, 1.6vw, 1.0625rem);
  line-height: 1.9;
  color: var(--silver);
}

.page-about .about-contact__list {
  list-style: none;
  margin: 0 0 clamp(20px, 3vw, 28px);
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-contact__item {
  display: grid;
  gap: 4px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

@media (min-width: 560px) {
  .page-about .about-contact__item {
    grid-template-columns: 130px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }
}

.page-about .about-contact__label {
  font-family: var(--font-mono);
  font-size: var(--step-mono);
  letter-spacing: 0.1em;
  color: var(--silver-dim);
}

.page-about .about-contact__value {
  font-size: var(--step-note);
  line-height: 1.75;
  color: var(--mist);
  word-break: break-word;
}

.page-about .about-contact__hint {
  margin: 0 0 clamp(20px, 3vw, 26px);
  font-size: var(--step-note);
  line-height: 1.85;
  color: var(--silver-dim);
}

.page-about .about-contact__hint a {
  color: var(--amber-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 166, 90, 0.45);
  transition: border-color 0.2s ease, color 0.2s ease;
}

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

.page-about .about-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-contact__figure {
  border-radius: var(--radius-lg);
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

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