/* ===== 品牌档案 · 页面专属样式（作用域 .page-about） ===== */

.page-about {
  --about-rail: 138px;
  --about-gap: clamp(22px, 3.4vw, 52px);
  --about-pad-y: clamp(48px, 7vw, 84px);
  display: block;
  background: var(--c-night);
  color: var(--c-mist);
  font-family: var(--ff-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-body);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-weight: 700;
  line-height: var(--lh-tight);
  letter-spacing: var(--ls-wide);
  color: var(--c-paper);
}

.page-about p {
  margin: 0 0 16px;
}

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

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

/* ---------- 第一屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: calc(var(--header-h) + 44px) 0 clamp(46px, 6vw, 80px);
  border-bottom: 1px solid var(--c-line);
  background:
    radial-gradient(130% 100% at 92% -12%, rgba(61, 242, 192, 0.18) 0%, rgba(61, 242, 192, 0) 58%),
    radial-gradient(90% 80% at -6% 106%, rgba(240, 180, 41, 0.1) 0%, rgba(240, 180, 41, 0) 62%),
    linear-gradient(176deg, #0b1c16 0%, #08130f 74%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    to bottom,
    rgba(233, 245, 240, 0.045) 0 1px,
    transparent 1px 4px
  );
}

.page-about .breadcrumb {
  margin: 0 0 clamp(24px, 4vw, 42px);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--fs-sm);
}

.page-about .breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--c-mist-dim);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  color: var(--c-line);
}

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

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

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

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 46px);
  align-items: end;
}

.page-about .about-kicker {
  display: inline-block;
  margin: 0 0 20px;
  padding: 6px 12px;
  border: 1px dashed var(--c-line);
  font-size: var(--fs-xs);
  letter-spacing: var(--ls-wider);
  color: var(--c-amber);
}

.page-about .mono {
  font-family: var(--ff-mono);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero h1 {
  margin: 0 0 22px;
  font-size: clamp(30px, 5vw, 56px);
  line-height: 1.16;
  text-wrap: balance;
}

.page-about .about-hero h1 .hl {
  color: var(--c-neon);
  box-shadow: inset 0 -2px 0 rgba(61, 242, 192, 0.35);
}

.page-about .about-hero__intro {
  max-width: 40em;
  margin-bottom: 30px;
  font-size: var(--fs-md);
  line-height: var(--lh-body);
  color: var(--c-mist);
}

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

.page-about .fact-list {
  display: grid;
  gap: 1px;
  margin: 0;
  border: 1px solid var(--c-line);
  background: var(--c-line);
}

.page-about .fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 16px;
  background: linear-gradient(180deg, rgba(14, 39, 33, 0.9), rgba(8, 19, 15, 0.96));
}

.page-about .fact dt {
  font-size: var(--fs-sm);
  letter-spacing: 0.06em;
  color: var(--c-mist-dim);
}

.page-about .fact dd {
  margin: 0;
  font-family: var(--ff-mono);
  font-size: var(--fs-md);
  color: var(--c-paper);
}

/* ---------- 主体双栏 ---------- */

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

.page-about .year-rail {
  border-bottom: 1px solid var(--c-line);
  background: linear-gradient(180deg, rgba(17, 20, 23, 0.96), rgba(8, 19, 15, 0.98));
}

.page-about .year-rail__title {
  margin: 0;
  padding: 14px var(--gutter) 0;
  font-size: var(--fs-xs);
  letter-spacing: var(--ls-wider);
  color: var(--c-mist-dim);
}

.page-about .year-rail__list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 12px var(--gutter) 16px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .year-tick {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: max-content;
  padding: 8px 14px;
  border: 1px solid var(--c-line);
  background: rgba(14, 39, 33, 0.55);
  color: var(--c-mist);
  text-decoration: none;
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .year-tick__year {
  font-family: var(--ff-mono);
  font-size: var(--fs-base);
  letter-spacing: 0.08em;
  color: var(--c-amber);
}

.page-about .year-tick__label {
  font-size: var(--fs-xs);
  color: var(--c-mist-dim);
  white-space: nowrap;
}

.page-about .year-tick:hover,
.page-about .year-tick:focus-visible {
  border-color: var(--c-neon);
  background: rgba(61, 242, 192, 0.1);
  color: var(--c-paper);
}

.page-about .year-tick:focus-visible {
  outline: 2px solid var(--c-neon);
  outline-offset: 2px;
}

.page-about .story-flow {
  min-width: 0;
}

/* ---------- 章节骨架 ---------- */

.page-about .story-section {
  padding: var(--about-pad-y) var(--gutter);
  border-bottom: 1px solid var(--c-line);
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.page-about .story-section--timeline {
  background: linear-gradient(180deg, rgba(14, 39, 33, 0.55) 0%, rgba(8, 19, 15, 0) 42%);
}

.page-about .about-sec-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .about-sec-num {
  flex: none;
  padding: 4px 9px;
  border: 1px solid var(--c-line);
  font-size: var(--fs-sm);
  letter-spacing: var(--ls-wider);
  color: var(--c-amber);
}

.page-about .about-sec-head h2 {
  margin: 0;
  font-size: clamp(22px, 3vw, 34px);
}

.page-about .section-lede {
  max-width: 38em;
  margin: 0 0 26px;
  font-size: var(--fs-sm);
  color: var(--c-mist-dim);
}

/* ---------- 01 起点 ---------- */

.page-about .story-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-about .story-text {
  max-width: 62ch;
  font-size: var(--fs-base);
}

.page-about .point-list {
  display: grid;
  gap: 1px;
  align-self: start;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--c-line);
  background: var(--c-line);
}

.page-about .point-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 16px;
  font-size: var(--fs-sm);
  background: linear-gradient(180deg, rgba(14, 39, 33, 0.75), rgba(8, 19, 15, 0.92));
}

.page-about .point-num {
  flex: none;
  padding: 1px 6px;
  border: 1px solid rgba(61, 242, 192, 0.4);
  font-size: var(--fs-xs);
  color: var(--c-neon);
}

/* ---------- 02 时间轴 ---------- */

.page-about .timeline-plate {
  position: relative;
  margin: 0 0 clamp(26px, 4vw, 44px);
  border: 1px solid var(--c-line);
  background: var(--c-carbon);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.34);
}

.page-about .timeline-plate img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  opacity: 0.8;
}

.page-about .node-track {
  display: grid;
}

.page-about .node {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: 30px 0;
  border-top: 1px dashed var(--c-line);
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.page-about .node:last-child {
  border-bottom: 1px dashed var(--c-line);
}

.page-about .node__year {
  margin: 0;
  font-family: var(--ff-mono);
  font-size: clamp(30px, 4.6vw, 46px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--c-amber);
}

.page-about .node__body h3 {
  margin: 0 0 8px;
  font-size: var(--fs-md);
}

.page-about .node__body p {
  font-size: var(--fs-base);
  color: var(--c-mist);
}

.page-about .inline-mono {
  font-family: var(--ff-mono);
  font-size: 0.94em;
  color: var(--c-paper);
  border-bottom: 1px dashed rgba(240, 180, 41, 0.5);
}

/* ---------- 03 团队 ---------- */

.page-about .media-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-about .team-figure {
  margin: 0;
  padding: 10px;
  border: 1px solid var(--c-line);
  background: var(--c-carbon);
  box-shadow: 10px 10px 0 rgba(61, 242, 192, 0.06);
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  border: 1px solid var(--c-line);
}

.page-about .team-copy > p {
  max-width: 58ch;
  margin-bottom: 24px;
  font-size: var(--fs-base);
}

.page-about .role-list {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .role-list li {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--c-line);
}

.page-about .role-list li:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.page-about .role-num {
  padding-top: 3px;
  font-family: var(--ff-mono);
  font-size: var(--fs-lg);
  line-height: 1;
  color: var(--c-neon);
}

.page-about .role-list h3 {
  margin: 0 0 6px;
  font-size: var(--fs-base);
}

.page-about .role-list p {
  margin: 0;
  font-size: var(--fs-sm);
  color: var(--c-mist);
}

/* ---------- 04 工序折叠面板 ---------- */

.page-about .steps {
  display: grid;
  gap: 10px;
}

.page-about .step {
  border: 1px solid var(--c-line);
  background: linear-gradient(180deg, rgba(17, 20, 23, 0.92), rgba(8, 19, 15, 0.95));
  transition: border-color 0.25s var(--ease);
}

.page-about .step[open] {
  border-color: rgba(61, 242, 192, 0.42);
}

.page-about .step > summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: var(--fs-base);
  letter-spacing: var(--ls-wide);
  color: var(--c-paper);
}

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

.page-about .step > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--ff-mono);
  font-size: var(--fs-md);
  line-height: 1;
  color: var(--c-amber);
}

.page-about .step[open] > summary::after {
  content: "–";
}

.page-about .step > summary:focus-visible {
  outline: 2px solid var(--c-neon);
  outline-offset: -2px;
}

.page-about .step__num {
  flex: none;
  font-size: var(--fs-sm);
  color: var(--c-amber);
}

.page-about .step__body {
  margin: 0 18px;
  padding: 14px 0 18px;
  border-top: 1px dashed var(--c-line);
  font-size: var(--fs-sm);
  color: var(--c-mist);
}

/* ---------- 05 归档 ---------- */

.page-about .archive-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-about .batch-line {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.page-about .archive-copy > p {
  max-width: 58ch;
  font-size: var(--fs-base);
}

.page-about .rule-list {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .rule-list li {
  padding: 13px 16px;
  border-left: 2px solid var(--c-line);
  background: rgba(14, 39, 33, 0.45);
  font-size: var(--fs-sm);
  color: var(--c-mist);
}

.page-about .rule-list li strong {
  display: block;
  margin-bottom: 4px;
  font-size: var(--fs-base);
  letter-spacing: var(--ls-wide);
  color: var(--c-paper);
}

.page-about .archive-figure {
  position: relative;
  align-self: start;
  margin: 0;
  padding: 10px;
  border: 1px solid var(--c-line);
  background: var(--c-carbon);
  box-shadow: -10px 10px 0 rgba(240, 180, 41, 0.07);
}

.page-about .archive-figure img {
  display: block;
  width: 100%;
  border: 1px solid var(--c-line);
}

.page-about .archive-figure .frame__cap {
  display: inline-block;
  margin-top: 10px;
  font-size: var(--fs-xs);
  letter-spacing: var(--ls-wider);
  color: var(--c-mist-dim);
}

/* ---------- 06 规模 ---------- */

.page-about .stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--c-line);
  background: var(--c-line);
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 18px;
  background: linear-gradient(180deg, rgba(14, 39, 33, 0.82), rgba(8, 19, 15, 0.96));
}

.page-about .stat__num {
  font-family: var(--ff-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.05;
  color: var(--c-paper);
}

.page-about .stat__num em {
  font-style: normal;
  color: var(--c-neon);
}

.page-about .stat__label {
  font-size: var(--fs-sm);
  color: var(--c-mist-dim);
}

.page-about .stat-note {
  max-width: 64ch;
  margin-top: 26px;
  padding-left: 16px;
  border-left: 2px solid rgba(61, 242, 192, 0.4);
  font-size: var(--fs-sm);
  color: var(--c-mist);
}

/* ---------- 07 长期做法 ---------- */

.page-about .practice-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .practice {
  padding: 24px 20px;
  border: 1px solid var(--c-line);
  border-top-width: 2px;
  background: linear-gradient(180deg, rgba(17, 20, 23, 0.9), rgba(8, 19, 15, 0.96));
}

.page-about .practice:nth-child(1) {
  border-top-color: var(--c-neon);
}

.page-about .practice:nth-child(2) {
  border-top-color: var(--c-amber);
}

.page-about .practice:nth-child(3) {
  border-top-color: var(--c-glow);
}

.page-about .practice h3 {
  margin: 0 0 10px;
  font-size: var(--fs-md);
}

.page-about .practice p {
  font-size: var(--fs-sm);
  color: var(--c-mist);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  padding: var(--about-pad-y) var(--gutter);
  border-bottom: 1px solid var(--c-line);
  background:
    radial-gradient(100% 130% at 12% 0%, rgba(61, 242, 192, 0.14) 0%, rgba(61, 242, 192, 0) 62%),
    linear-gradient(180deg, #0b1c16 0%, var(--c-night) 100%);
}

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

.page-about .about-cta h2 {
  margin: 0 0 14px;
  font-size: clamp(22px, 3vw, 32px);
}

.page-about .about-cta p {
  margin-bottom: 26px;
  font-size: var(--fs-base);
  color: var(--c-mist);
}

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

/* ---------- 入场动效 ---------- */

.page-about [data-reveal] {
  opacity: 1;
}

@media (prefers-reduced-motion: no-preference) {
  .page-about [data-reveal].is-in {
    animation: about-rise 0.62s var(--ease) both;
  }
}

@keyframes about-rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 平板与桌面 ---------- */

@media (min-width: 700px) {
  .page-about .node {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 28px;
    align-items: start;
    padding: 34px 0;
  }

  .page-about .node__body {
    max-width: 56ch;
    padding-left: 22px;
    border-left: 1px solid var(--c-line);
  }

  .page-about .node:nth-child(2) .node__body {
    margin-left: 16px;
  }

  .page-about .node:nth-child(3) .node__body {
    margin-left: 32px;
  }

  .page-about .node__year {
    padding-top: 4px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 0.9fr);
  }

  .page-about .story-cols {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 40px;
  }

  .page-about .media-split {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.2fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .archive-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: 40px;
  }

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

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: var(--about-gap);
    box-sizing: border-box;
    max-width: var(--shell);
    margin: 0 auto;
    padding: 0 var(--gutter);
  }

  .page-about .year-rail {
    position: sticky;
    top: calc(var(--header-h) + 26px);
    align-self: start;
    margin-top: var(--about-pad-y);
    padding-bottom: 8px;
    border: 1px solid var(--c-line);
  }

  .page-about .year-rail__title {
    padding: 14px 14px 4px;
  }

  .page-about .year-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 4px 12px 14px;
  }

  .page-about .year-tick {
    flex-direction: row;
    align-items: baseline;
    gap: 9px;
    min-width: 0;
    padding: 9px 10px;
    border: none;
    border-left: 2px solid var(--c-line);
    background: transparent;
  }

  .page-about .year-tick:hover,
  .page-about .year-tick:focus-visible {
    border-left-color: var(--c-neon);
    background: rgba(61, 242, 192, 0.08);
  }

  .page-about .story-section,
  .page-about .about-cta {
    padding-left: 0;
    padding-right: 0;
  }
}

@media (min-width: 1280px) {
  .page-about .about-hero__grid {
    align-items: center;
  }
}