/* ================= 页面作用域：品牌档案 ================= */
.page-about {
  --about-line: rgba(43, 231, 200, 0.18);
  --about-line-2: rgba(124, 154, 147, 0.24);
  --about-rhythm: clamp(56px, 8vw, 104px);
  display: block;
  background: var(--c-fir);
  color: var(--c-chalk);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
}

.page-about .page-section {
  position: relative;
  padding: var(--about-rhythm) 0;
  overflow: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-head);
  letter-spacing: -0.02em;
}

.page-about .num,
.page-about .stat-num,
.page-about .chapter-number,
.page-about .tl-year .num,
.page-about .team-count,
.page-about .partner-num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
}

/* ---------- 通用章节头 ---------- */
.page-about .section-head {
  align-items: start;
  row-gap: 16px;
  margin-bottom: clamp(24px, 3.4vw, 44px);
}

.page-about .eyebrow {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-amber);
  margin: 0;
}

.page-about .chapter-number {
  font-weight: 700;
  font-size: clamp(46px, 6.6vw, 94px);
  line-height: 0.8;
  letter-spacing: -0.04em;
  color: transparent;
  -webkit-text-stroke: 1px var(--c-cyan);
  opacity: 0.5;
  margin: 0 0 12px;
}

.page-about .section-title {
  font-weight: 900;
  font-size: clamp(26px, 3.4vw, 44px);
  line-height: 1.14;
  margin: 0 0 14px;
  color: var(--c-chalk);
}

.page-about .lede {
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.78;
  color: rgba(238, 243, 241, 0.82);
  max-width: 64ch;
  margin: 0;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--c-mute);
  margin-bottom: clamp(24px, 3.4vw, 42px);
}

.page-about .breadcrumb a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s var(--ease);
}

.page-about .breadcrumb a:hover {
  border-bottom-color: var(--c-cyan);
}

.page-about .crumb-sep {
  color: var(--c-mute);
  opacity: 0.55;
}

.page-about .crumb-now {
  color: var(--c-chalk);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(96px, 15vh, 168px);
  padding-bottom: clamp(48px, 6vw, 78px);
  background:
    radial-gradient(58% 46% at 82% 6%, rgba(43, 231, 200, 0.15), transparent 68%),
    radial-gradient(42% 38% at 8% 92%, rgba(255, 182, 77, 0.09), transparent 70%),
    var(--c-fir);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--about-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-line) 1px, transparent 1px);
  background-size: 84px 84px;
  -webkit-mask-image: radial-gradient(75% 65% at 50% 26%, #000 0%, transparent 78%);
  mask-image: radial-gradient(75% 65% at 50% 26%, #000 0%, transparent 78%);
  opacity: 0.85;
  pointer-events: none;
}

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

.page-about .hero-grid {
  align-items: start;
  row-gap: 28px;
}

.page-about .hero-index .chapter-index {
  display: flex;
  flex-direction: column;
  margin-top: 12px;
  border-left: 1px solid var(--about-line-2);
}

.page-about .hero-index .chapter-link {
  display: block;
  padding: 7px 0 7px 14px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  font-size: 13px;
  line-height: 1.5;
  color: var(--c-mute);
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .hero-index .chapter-link:hover,
.page-about .hero-index .chapter-link.is-active {
  color: var(--c-cyan);
  border-left-color: var(--c-cyan);
}

.page-about h1 {
  font-weight: 900;
  font-size: clamp(30px, 4.6vw, 58px);
  line-height: 1.1;
  margin: 14px 0 20px;
  color: var(--c-chalk);
}

.page-about h1 .hl {
  color: var(--c-cyan);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .hero-stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin: clamp(36px, 5vw, 60px) 0 0;
  padding: clamp(20px, 2.4vw, 28px) 0 0;
  border-top: 1px solid var(--about-line);
}

.page-about .hero-stats .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 16px;
  border-left: 1px solid var(--about-line-2);
}

.page-about .stat-num {
  font-weight: 700;
  font-size: clamp(30px, 3.6vw, 46px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-cyan);
}

.page-about .stat-label {
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--c-mute);
}

/* ---------- 图片容器 ---------- */
.page-about .media-frame {
  display: block;
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--about-line-2);
  background: var(--c-fir-2);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: brightness(0.78) saturate(1.08) contrast(1.06);
}

.page-about .media-frame__caption {
  padding: 10px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--c-mute);
  border-top: 1px solid var(--about-line-2);
}

.page-about .tl-figure {
  margin-bottom: clamp(26px, 3.4vw, 40px);
}

.page-about .tl-figure img {
  aspect-ratio: 1600 / 1000;
}

.page-about .wf-figure {
  margin-bottom: clamp(26px, 3.4vw, 40px);
}

.page-about .wf-figure img {
  aspect-ratio: 16 / 9;
}

.page-about .cov-figure img {
  aspect-ratio: 4 / 3;
}

/* ---------- 01 历程 ---------- */
.page-about .about-band--timeline {
  background: var(--c-fir-2);
  border-top: 1px solid var(--about-line);
}

.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 22px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--about-line-2);
}

.page-about .filter-btn {
  appearance: none;
  border: 1px solid var(--about-line-2);
  background: transparent;
  color: var(--c-mute);
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1;
  padding: 9px 16px;
  border-radius: var(--pill);
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .filter-btn:hover {
  color: var(--c-cyan);
  border-color: var(--c-cyan);
}

.page-about .filter-btn.is-active {
  color: var(--ink-on-cyan);
  background: var(--c-cyan);
  border-color: var(--c-cyan);
}

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

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  padding: 22px 0 22px 22px;
  border-top: 1px solid var(--about-line-2);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 30px;
  width: 9px;
  height: 9px;
  background: var(--c-cyan);
  box-shadow: 0 0 0 4px rgba(43, 231, 200, 0.14);
}

.page-about .tl-item.is-hidden {
  display: none;
}

.page-about .tl-year {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .tl-year .num {
  font-weight: 700;
  font-size: clamp(28px, 3vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-cyan);
}

.page-about .tl-phase {
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--c-amber);
  border: 1px solid rgba(255, 182, 77, 0.4);
  padding: 3px 9px;
  border-radius: var(--pill);
}

.page-about .tl-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .tl-event,
.page-about .tl-impact {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
}

.page-about .tl-event {
  color: var(--c-chalk);
}

.page-about .tl-impact {
  color: rgba(238, 243, 241, 0.76);
}

.page-about .tl-tag {
  display: block;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--c-mute);
  margin-bottom: 6px;
}

.page-about .tl-impact .tl-tag {
  color: var(--c-cyan);
}

/* ---------- 02 内容产出 ---------- */
.page-about .about-band--workflow {
  background:
    linear-gradient(180deg, rgba(58, 42, 107, 0.5) 0%, rgba(6, 23, 19, 0.94) 62%),
    var(--c-fir);
  border-top: 1px solid var(--about-line);
}

.page-about .wf-list {
  list-style: none;
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
}

.page-about .wf-step {
  border: 1px solid var(--about-line-2);
  background: rgba(14, 42, 36, 0.55);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .wf-step:hover {
  border-color: rgba(43, 231, 200, 0.5);
}

.page-about .wf-step[open] {
  border-color: var(--c-cyan);
  background: rgba(14, 42, 36, 0.85);
}

.page-about .wf-step > summary {
  display: grid;
  grid-template-columns: 44px 1fr auto;
  align-items: center;
  gap: 14px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .wf-step > summary::-webkit-details-marker {
  display: none;
}

.page-about .wf-no {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 20px;
  line-height: 1;
  color: var(--c-amber);
}

.page-about .wf-name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 16.5px;
  letter-spacing: 0.01em;
  color: var(--c-cyan-white);
}

.page-about .wf-hint {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-mute);
  white-space: nowrap;
}

.page-about .wf-detail {
  padding: 0 16px 18px 74px;
  border-top: 1px solid var(--about-line-2);
  margin-top: 2px;
  padding-top: 16px;
}

.page-about .wf-detail p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(238, 243, 241, 0.8);
}

.page-about .wf-out {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
}

.page-about .wf-out-label {
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-cyan);
  border: 1px solid var(--about-line);
  padding: 2px 8px;
}

/* ---------- 03 团队 ---------- */
.page-about .about-band--team {
  background: var(--c-fir);
  border-top: 1px solid var(--about-line);
}

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

.page-about .team-row {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "role count"
    "duty duty";
  gap: 8px 16px;
  align-items: baseline;
  padding: 18px 0 18px 16px;
  border-bottom: 1px solid var(--about-line-2);
  border-left: 2px solid transparent;
  transition: border-left-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .team-row:hover {
  border-left-color: var(--c-cyan);
  background: rgba(43, 231, 200, 0.04);
}

.page-about .team-role {
  grid-area: role;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 16px;
  letter-spacing: 0.03em;
  color: var(--c-cyan-white);
}

.page-about .team-count {
  grid-area: count;
  font-weight: 700;
  font-size: clamp(22px, 2.6vw, 32px);
  line-height: 1;
  color: var(--c-amber);
}

.page-about .team-unit {
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.08em;
  margin-left: 4px;
  color: var(--c-mute);
}

.page-about .team-duty {
  grid-area: duty;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(238, 243, 241, 0.78);
}

.page-about .scout-note {
  margin-top: 26px;
  padding: 22px 22px 22px 24px;
  border-left: 2px solid var(--c-cyan);
  background: linear-gradient(90deg, rgba(43, 231, 200, 0.09), transparent 72%);
}

.page-about .scout-title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  color: var(--c-cyan-white);
}

.page-about .scout-note p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(238, 243, 241, 0.78);
}

/* ---------- 04 栏目 ---------- */
.page-about .about-band--columns {
  background: var(--c-fir-2);
  border-top: 1px solid var(--about-line);
}

.page-about .col-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .col-card {
  display: flex;
  flex-direction: column;
  padding: 22px 20px 20px;
  background: rgba(6, 23, 19, 0.62);
  border: 1px solid var(--about-line-2);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .col-card:hover {
  border-color: var(--c-cyan);
  background: rgba(14, 42, 36, 0.82);
}

.page-about .col-no {
  margin: 0;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-mute);
}

.page-about .col-card h3 {
  margin: 8px 0 10px;
  font-weight: 800;
  font-size: 19px;
  color: var(--c-cyan-white);
}

.page-about .col-card p {
  margin: 0 0 18px;
  font-size: 14.6px;
  line-height: 1.72;
  color: rgba(238, 243, 241, 0.76);
}

.page-about .col-tempo {
  margin-top: auto;
  display: block;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 182, 77, 0.3);
  font-family: var(--font-num);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--c-amber);
}

/* ---------- 05 覆盖范围 ---------- */
.page-about .about-band--coverage {
  background:
    radial-gradient(52% 58% at 88% 18%, rgba(43, 231, 200, 0.1), transparent 70%),
    var(--c-fir);
  border-top: 1px solid var(--about-line);
}

.page-about .coverage-grid {
  align-items: start;
  row-gap: 32px;
}

.page-about .cov-title {
  margin: 0 0 14px;
  font-weight: 800;
  font-size: 18px;
  letter-spacing: 0.02em;
  color: var(--c-chalk);
}

.page-about .cov-title--spaced {
  margin-top: 34px;
}

.page-about .cov-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-line-2);
}

.page-about .cov-list li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 15px 0;
  border-bottom: 1px solid var(--about-line-2);
}

.page-about .cov-key {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 15px;
  color: var(--c-cyan-white);
}

.page-about .cov-val {
  font-size: 15px;
  line-height: 1.72;
  color: rgba(238, 243, 241, 0.76);
}

.page-about .cov-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(238, 243, 241, 0.8);
}

/* ---------- 06 合作 ---------- */
.page-about .about-band--partners {
  background: var(--c-fir-2);
  border-top: 1px solid var(--about-line);
}

.page-about .partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-line-2);
  border: 1px solid var(--about-line-2);
}

.page-about .partner-cell {
  background: var(--c-fir);
  padding: 26px 24px;
}

.page-about .partner-num {
  display: block;
  font-weight: 700;
  font-size: clamp(38px, 4.6vw, 56px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-amber);
}

.page-about .partner-cell p {
  margin: 14px 0 0;
  font-size: 14.6px;
  line-height: 1.74;
  color: rgba(238, 243, 241, 0.78);
}

.page-about .partner-foot {
  margin: 26px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(238, 243, 241, 0.78);
}

.page-about .partner-foot a,
.page-about .cta-links a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 231, 200, 0.4);
  transition: border-color 0.2s var(--ease);
}

.page-about .partner-foot a:hover,
.page-about .cta-links a:hover {
  border-bottom-color: var(--c-cyan);
}

/* ---------- 结尾引导 ---------- */
.page-about .about-band--cta {
  background:
    linear-gradient(118deg, rgba(43, 231, 200, 0.13), rgba(255, 122, 61, 0.08) 58%, transparent 88%),
    var(--c-fir);
  border-top: 1px solid var(--about-line);
}

.page-about .cta-slab {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: center;
}

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

.page-about .cta-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 26px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--about-line);
  font-size: 14px;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .cov-list li {
    grid-template-columns: 150px 1fr;
    gap: 18px;
    align-items: baseline;
  }

  .page-about .cta-links {
    flex-direction: row;
    gap: 28px;
  }
}

@media (min-width: 760px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .tl-item {
    grid-template-columns: 168px 1fr;
    gap: 28px;
    padding: 26px 0 26px 26px;
  }

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

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

  .page-about .cta-slab {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 32px;
  }
}

@media (min-width: 800px) {
  .page-about .team-row {
    grid-template-columns: 170px 76px minmax(0, 1fr);
    grid-template-areas: "role count duty";
    gap: 20px;
    padding: 20px 0 20px 20px;
  }
}

@media (min-width: 1040px) {
  .page-about .tl-body {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 34px;
  }

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

@media (max-width: 619px) {
  .page-about .wf-step > summary {
    grid-template-columns: 36px 1fr;
    gap: 10px;
  }

  .page-about .wf-hint {
    grid-column: 2;
    white-space: normal;
  }

  .page-about .wf-detail {
    padding-left: 16px;
  }

  .page-about .hero-stats .stat {
    padding-left: 12px;
  }
}

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