/* ===================== 品牌历程页 ===================== */
.page-about {
  display: block;
  background: var(--ink-900);
  color: var(--text);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(104px, 15vw, 168px) 0 clamp(44px, 6vw, 76px);
  border-bottom: 2px solid var(--stroke);
  background: linear-gradient(140deg, var(--ink-900) 0%, var(--ink-800) 46%, var(--navy-900) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -16%;
  top: -28%;
  width: 44vw;
  height: 44vw;
  max-width: 620px;
  max-height: 620px;
  background: var(--lime);
  opacity: 0.07;
  border: 2px solid var(--stroke);
  transform: rotate(24deg);
  pointer-events: none;
}

.page-about .hero-texture {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.page-about .hero-texture img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.28;
}

.page-about .hero-inner {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(20px, 3vw, 34px);
  font-size: 13px;
  color: var(--muted);
}

.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) ease-out, border-color var(--dur) ease-out;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about .breadcrumb .crumb-sep {
  color: var(--stroke-2);
}

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

.page-about .hero-split {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(16px, 2vw, 22px);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(2.05rem, 6.2vw, 4.1rem);
  line-height: 1.06;
  letter-spacing: -0.015em;
  max-width: 16em;
}

.page-about .about-hero .lede {
  margin: 0 0 clamp(22px, 3vw, 32px);
  max-width: 62ch;
  font-size: clamp(0.98rem, 2vw, 1.12rem);
  line-height: 1.85;
  color: var(--text);
  opacity: 0.88;
}

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

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin: 0;
  padding: 0;
  border: 2px solid var(--stroke);
  background: var(--stroke);
  box-shadow: var(--shadow);
}

.page-about .hero-stat {
  min-width: 0;
  padding: clamp(14px, 2vw, 22px);
  background: var(--ink-800);
}

.page-about .hero-stat .stat-label {
  display: block;
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .hero-stat .stat-value {
  display: block;
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 4.4vw, 2.5rem);
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  border-bottom: 2px solid var(--stroke);
  background: var(--ink-800);
}

.page-about .about-index-inner {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-top: 12px;
  padding-bottom: 12px;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index a {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 15px;
  border: 2px solid var(--stroke);
  border-radius: 999px;
  background: var(--ink-900);
  color: var(--text);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: transform var(--dur) ease-out, border-color var(--dur) ease-out;
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  border-color: var(--lime);
  transform: translateY(-2px);
}

.page-about .about-index a .mono {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--lime);
}

/* ---------- 通用区块 ---------- */
.page-about .about-section {
  padding: clamp(52px, 8vw, 106px) 0;
  border-bottom: 2px solid var(--stroke);
}

.page-about .about-section--navy {
  background: var(--navy-900);
}

.page-about .about-section--timeline {
  background:
    repeating-linear-gradient(90deg, rgba(42, 74, 65, 0.32) 0 1px, transparent 1px 96px),
    var(--ink-900);
}

.page-about .section-head {
  max-width: 900px;
  margin-bottom: clamp(26px, 4vw, 48px);
}

.page-about .section-num {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-about .section-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.55rem, 4.2vw, 2.85rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
}

.page-about .section-lede {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: clamp(0.94rem, 1.8vw, 1.04rem);
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 起点 ---------- */
.page-about .origin-grid {
  display: grid;
  gap: clamp(24px, 3vw, 44px);
}

.page-about .origin-copy p {
  margin: 0 0 1.05em;
  max-width: 64ch;
  font-size: clamp(0.96rem, 1.9vw, 1.05rem);
  line-height: 1.9;
}

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

.page-about .origin-note {
  align-self: start;
  padding: clamp(20px, 2.6vw, 30px);
  border-left: 6px solid var(--orange);
}

.page-about .origin-note p:last-child {
  margin: 12px 0 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 28px;
  border-left: 2px solid var(--stroke);
  list-style: none;
  display: grid;
  gap: clamp(28px, 4vw, 54px);
}

.page-about .tl-item {
  position: relative;
  min-width: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -35px;
  top: 16px;
  width: 12px;
  height: 12px;
  background: var(--lime);
  border: 2px solid var(--ink-900);
  transform: rotate(45deg);
}

.page-about .tl-item--now::before {
  background: var(--orange);
}

.page-about .tl-year {
  margin-bottom: 14px;
}

.page-about .tl-year .mono {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.1rem, 7.5vw, 4.4rem);
  line-height: 0.92;
  letter-spacing: -0.04em;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .tl-item--now .tl-year .mono {
  color: var(--orange);
  font-size: clamp(1.7rem, 5.2vw, 3rem);
}

.page-about .tl-year-note {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .tl-card {
  padding: clamp(18px, 2.4vw, 28px);
  border-left: 4px solid var(--stroke-2);
  min-width: 0;
}

.page-about .tl-item--now .tl-card {
  border-left-color: var(--orange);
}

.page-about .tl-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.1rem, 2.4vw, 1.5rem);
  line-height: 1.3;
}

.page-about .tl-card > p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .tl-more {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 2px dashed var(--stroke);
}

.page-about .tl-more summary {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  cursor: pointer;
  list-style: none;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--lime);
}

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

.page-about .tl-more summary::after {
  content: "";
  width: 7px;
  height: 7px;
  border-right: 2px solid var(--lime);
  border-bottom: 2px solid var(--lime);
  transform: rotate(45deg) translateY(-2px);
  transition: transform var(--dur) ease-out;
}

.page-about .tl-more[open] summary::after {
  transform: rotate(-135deg) translateY(-2px);
}

.page-about .tl-more summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 4px;
}

.page-about .tl-more p {
  margin: 12px 0 0;
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--muted);
  max-width: 60ch;
}

/* ---------- 团队分工 ---------- */
.page-about .team-layout {
  display: grid;
  gap: clamp(24px, 3.4vw, 44px);
}

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

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

.page-about .squad-grid {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 2px solid var(--stroke);
  background: var(--stroke);
}

.page-about .squad {
  position: relative;
  display: grid;
  gap: 8px;
  align-content: start;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--ink-800);
  overflow: hidden;
  transition: background var(--dur) ease-out;
}

.page-about .squad::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--lime);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--dur) ease-out;
}

.page-about .squad:hover {
  background: var(--ink-700);
}

.page-about .squad:hover::before,
.page-about .squad:focus-within::before {
  transform: scaleY(1);
}

.page-about .squad-id {
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .squad h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.12rem;
  line-height: 1.3;
}

.page-about .squad p {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .squad .squad-meta {
  color: var(--text);
  font-size: 0.85rem;
  letter-spacing: 0.02em;
}

.page-about .squad .squad-count {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--lime);
}

.page-about .shift-strip {
  display: grid;
  gap: 2px;
  margin-top: clamp(20px, 3vw, 34px);
  border: 2px solid var(--stroke-2);
  background: var(--stroke-2);
}

.page-about .shift-item {
  padding: clamp(16px, 2.2vw, 24px);
  background: var(--navy-800);
  min-width: 0;
}

.page-about .shift-value {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.35rem, 3.2vw, 2rem);
  line-height: 1;
  color: var(--lime);
}

.page-about .shift-label {
  display: block;
  margin-top: 10px;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 档案体系 ---------- */
.page-about .archive-split {
  display: grid;
  gap: clamp(26px, 3.6vw, 52px);
}

.page-about .archive-copy p {
  margin: 0 0 1.05em;
  max-width: 58ch;
  font-size: clamp(0.95rem, 1.9vw, 1.04rem);
  line-height: 1.9;
}

.page-about .fact-list {
  display: grid;
  gap: 14px;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .fact-list li {
  display: grid;
  grid-template-columns: minmax(72px, 112px) minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--stroke);
}

.page-about .fact-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  line-height: 1.1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .fact-text {
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--muted);
}

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

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

/* ---------- 内容合作 ---------- */
.page-about .coop-grid {
  display: grid;
  gap: 16px;
}

.page-about .coop-card {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: clamp(20px, 2.5vw, 30px);
  min-width: 0;
}

.page-about .coop-card .coop-num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.9rem, 5vw, 3rem);
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .coop-card h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.08rem;
  line-height: 1.3;
}

.page-about .coop-card > p:last-child {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 服务范围 ---------- */
.page-about .about-region {
  padding: clamp(44px, 7vw, 88px) 0;
  border-bottom: 2px solid var(--stroke);
  background: linear-gradient(115deg, var(--ink-800) 0%, var(--navy-800) 100%);
}

.page-about .region-band {
  display: grid;
  gap: clamp(24px, 3vw, 40px);
  padding: clamp(24px, 3.6vw, 46px);
  border: 2px solid var(--stroke);
  border-left: 6px solid var(--lime);
  background: var(--ink-800);
  box-shadow: var(--shadow);
}

.page-about .region-kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .region-copy h2 {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.45rem, 3.8vw, 2.3rem);
  line-height: 1.16;
}

.page-about .region-copy > p:last-child {
  margin: 0;
  max-width: 64ch;
  font-size: 0.95rem;
  line-height: 1.88;
  color: var(--muted);
}

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

/* ---------- 继续了解 ---------- */
.page-about .about-next {
  border-bottom: none;
}

.page-about .next-grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .next-card {
  display: grid;
  gap: 9px;
  align-content: start;
  padding: clamp(18px, 2.4vw, 26px);
  border: 2px solid var(--stroke);
  background: var(--ink-800);
  color: var(--text);
  text-decoration: none;
  box-shadow: var(--shadow);
  min-width: 0;
  transition: transform var(--dur) ease-out, box-shadow var(--dur) ease-out, border-color var(--dur) ease-out;
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  transform: translate(-4px, -4px);
  box-shadow: 12px 12px 0 rgba(0, 0, 0, 0.5);
  border-color: var(--lime);
}

.page-about .next-card .mono {
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--orange);
}

.page-about .next-card h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.08rem;
}

.page-about .next-card p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .to-top-wrap {
  padding-bottom: clamp(44px, 7vw, 92px);
}

.page-about .to-top {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  border: 2px solid var(--stroke);
  border-radius: 999px;
  background: var(--ink-800);
  color: var(--text);
  font-size: 13px;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition: border-color var(--dur) ease-out, transform var(--dur) ease-out;
}

.page-about .to-top::before {
  content: "";
  width: 8px;
  height: 8px;
  border-top: 2px solid var(--lime);
  border-left: 2px solid var(--lime);
  transform: rotate(45deg);
}

.page-about .to-top:hover,
.page-about .to-top:focus-visible {
  border-color: var(--lime);
  transform: translateY(-3px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .squad-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .coop-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .shift-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .next-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .hero-split {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.85fr);
    align-items: end;
  }
  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.9fr);
    align-items: start;
  }
  .page-about .region-band {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
    align-items: center;
  }
  .page-about .tl-item {
    display: grid;
    grid-template-columns: minmax(150px, 220px) minmax(0, 1fr);
    gap: clamp(20px, 3vw, 46px);
    align-items: start;
  }
  .page-about .tl-year {
    margin-bottom: 0;
    text-align: right;
  }
  .page-about .tl-item::before {
    left: -35px;
    top: 20px;
  }
  .page-about .timeline {
    padding-left: 44px;
  }
}

@media (min-width: 960px) {
  .page-about .archive-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    align-items: center;
  }
}

@media (min-width: 1000px) {
  .page-about .team-layout {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }
  .page-about .squad-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about .next-card,
  .page-about .to-top,
  .page-about .squad,
  .page-about .squad::before,
  .page-about .about-index a {
    transition: none;
  }
  .page-about .next-card:hover,
  .page-about .to-top:hover {
    transform: none;
  }
}