.page-about {
  --about-rail: 236px;
  background: var(--paper);
  color: var(--ink-green);
  overflow-x: clip;
}

/* ---------- 面包屑条 ---------- */
.page-about .crumb-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 20px;
  padding-top: 22px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--paper-line);
}

.page-about .crumb-strip__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--moss);
}

/* ---------- 首屏 ---------- */
.page-about .culture-hero {
  position: relative;
  isolation: isolate;
  background: var(--ink-field);
  color: var(--paper);
  overflow: hidden;
}

.page-about .culture-hero::before {
  content: "";
  position: absolute;
  inset: -2px;
  z-index: -1;
  background: var(--ink-green);
  clip-path: polygon(0 0, 76% 0, 54% 100%, 0 100%);
}

.page-about .culture-hero::after {
  content: "";
  position: absolute;
  right: -80px;
  top: -110px;
  z-index: -1;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  background: radial-gradient(circle at 42% 42%, rgba(47, 227, 198, 0.24), transparent 68%);
}

.page-about .culture-hero .hue-band {
  position: relative;
  z-index: 1;
}

.page-about .culture-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 46px);
  padding-top: clamp(34px, 6vw, 78px);
  padding-bottom: clamp(46px, 7vw, 92px);
}

.page-about .culture-hero__label {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .culture-hero h1 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(32px, 4.6vw, 56px);
  line-height: 1.14;
  letter-spacing: 0.01em;
  max-width: 17ch;
}

.page-about .culture-hero__lede {
  margin: 22px 0 0;
  max-width: 44ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(243, 238, 225, 0.82);
}

.page-about .hero-stats {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 20px;
  max-width: 480px;
}

.page-about .hero-stats li {
  padding-top: 10px;
  border-top: 1px solid rgba(47, 227, 198, 0.34);
}

.page-about .hero-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  letter-spacing: 0.04em;
  color: var(--amber);
}

.page-about .hero-stats__cap {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.06em;
  color: rgba(243, 238, 225, 0.68);
}

.page-about .culture-hero__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink-teal);
  box-shadow: 0 34px 70px -42px rgba(0, 0, 0, 0.85);
}

.page-about .culture-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 主体框架 ---------- */
.page-about .culture-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 56px);
  padding-top: clamp(38px, 6vw, 78px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .culture-rail {
  display: grid;
  gap: 28px;
  align-content: start;
}

.page-about .rail-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .rail-nav {
  display: grid;
  gap: 2px;
}

.page-about .rail-nav .toc-link {
  display: block;
  padding: 8px 10px 8px 12px;
  border-left: 2px solid var(--paper-line);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: 14px;
  line-height: 1.5;
  color: var(--moss);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .rail-nav .toc-link:hover {
  color: var(--ink-green);
  border-left-color: var(--cyan);
}

.page-about .rail-nav .toc-link[aria-current] {
  color: var(--ink-green);
  font-weight: 600;
  border-left-color: var(--amber);
  background: rgba(231, 169, 61, 0.13);
}

.page-about .year-scale {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .year-scale::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: var(--paper-line);
}

.page-about .year-scale a {
  position: relative;
  display: block;
  padding: 6px 0 6px 22px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--moss);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .year-scale a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 3px var(--paper);
}

.page-about .year-scale a:hover {
  color: var(--ink-green);
}

.page-about .year-scale .mono {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-teal);
  font-weight: 600;
}

/* ---------- 章节 ---------- */
.page-about .c-section {
  scroll-margin-top: 112px;
}

.page-about .c-section + .c-section {
  margin-top: clamp(44px, 6vw, 78px);
  padding-top: clamp(34px, 5vw, 58px);
  border-top: 1px solid var(--paper-line);
}

.page-about .c-section__idx {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .c-section h2 {
  margin: 0 0 20px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(26px, 3.2vw, 40px);
  line-height: 1.2;
  color: var(--ink-field);
  max-width: 22ch;
}

.page-about .c-section__prose p {
  margin: 0 0 16px;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-green);
}

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

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 30px 0 0;
  padding: 0 0 0 0;
  border-left: 1px solid var(--paper-line);
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 22px 24px;
  scroll-margin-top: 120px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 5px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--amber);
  border: 2px solid var(--paper);
}

.page-about .timeline__year {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ink-teal);
}

.page-about .timeline__body h3 {
  margin: 0 0 5px;
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink-field);
}

.page-about .timeline__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--moss);
}

/* ---------- 内容线卡片 ---------- */
.page-about .line-card {
  --card-hue: var(--cyan);
  position: relative;
  margin-top: 20px;
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--radius-lg);
  background: var(--paper-raise);
  border: 1px solid var(--paper-line);
  box-shadow: 0 24px 48px -44px rgba(11, 21, 18, 0.7);
  overflow: hidden;
}

.page-about .line-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--card-hue);
}

.page-about .line-card--cyan { --card-hue: var(--cyan); }
.page-about .line-card--violet { --card-hue: var(--violet); }
.page-about .line-card--amber { --card-hue: var(--amber); }

.page-about .line-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.page-about .line-card__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--moss);
}

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

.page-about .line-card__figure {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--ink-teal);
}

.page-about .line-card__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 5;
  object-fit: cover;
}

.page-about .spec-list {
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .spec-list > div {
  display: grid;
  grid-template-columns: minmax(0, 62px) minmax(0, 1fr);
  gap: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--paper-line);
}

.page-about .spec-list > div:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .spec-list dt {
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--moss);
}

.page-about .spec-list dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-green);
}

/* ---------- 团队条形 ---------- */
.page-about .team-bars {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .team-bar {
  --bar-hue: var(--cyan);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
}

.page-about .team-bar:nth-child(1) { --bar-hue: var(--cyan); }
.page-about .team-bar:nth-child(2) { --bar-hue: var(--violet); }
.page-about .team-bar:nth-child(3) { --bar-hue: var(--amber); }
.page-about .team-bar:nth-child(4) { --bar-hue: var(--moss); }

.page-about .team-bar__track {
  display: block;
  width: 100%;
  height: 12px;
  border-radius: var(--radius-pill);
  background: var(--paper-line);
  overflow: hidden;
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
  border-radius: var(--radius-pill);
  background: var(--bar-hue);
}

.page-about .team-bar:nth-child(1) .team-bar__fill { width: 100%; }
.page-about .team-bar:nth-child(2) .team-bar__fill { width: 71.4%; }
.page-about .team-bar:nth-child(3) .team-bar__fill { width: 57.1%; }
.page-about .team-bar:nth-child(4) .team-bar__fill { width: 28.6%; }

.page-about .team-bar__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .team-bar__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-field);
}

.page-about .team-bar__count {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--ink-teal);
}

.page-about .team-bar__note {
  margin: 0;
  max-width: 40em;
  font-size: 14px;
  line-height: 1.78;
  color: var(--moss);
}

.page-about .quality-row {
  margin-top: 30px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .quality-item {
  padding: 16px 18px;
  border-radius: var(--radius-md);
  background: var(--ink-green);
  color: var(--paper);
}

.page-about .quality-item__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  letter-spacing: 0.03em;
  color: var(--cyan);
}

.page-about .quality-item__cap {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(243, 238, 225, 0.72);
}

/* ---------- 色标板 ---------- */
.page-about .hue-board {
  margin-top: 28px;
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--radius-lg);
  background: var(--ink-green);
  color: var(--paper);
}

.page-about .hue-rule {
  display: block;
  width: 100%;
  height: 12px;
  margin-bottom: 18px;
  color: var(--cyan);
}

.page-about .hue-board__title {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .hue-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 12px;
}

.page-about .hue-chip {
  display: grid;
  gap: 6px;
}

.page-about .hue-chip__swatch {
  display: block;
  height: 50px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(243, 238, 225, 0.18);
}

.page-about .sw-field { background: var(--ink-field); }
.page-about .sw-green { background: var(--ink-green); }
.page-about .sw-teal { background: var(--ink-teal); }
.page-about .sw-paper { background: var(--paper); }
.page-about .sw-line { background: var(--paper-line); }
.page-about .sw-cyan { background: var(--cyan); }
.page-about .sw-amber { background: var(--amber); }
.page-about .sw-violet { background: var(--violet); }

.page-about .hue-chip__name {
  font-size: 12.5px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .hue-chip__use {
  font-size: 12px;
  line-height: 1.55;
  color: rgba(243, 238, 225, 0.62);
}

.page-about .palette-figure {
  margin: 22px 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink-teal);
}

.page-about .palette-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 25 / 14;
  object-fit: cover;
}

/* ---------- 互通 ---------- */
.page-about .partner-grid {
  margin-top: 26px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .partner-card {
  padding: 18px 20px;
  border-radius: var(--radius-md);
  background: var(--paper-raise);
  border: 1px solid var(--paper-line);
}

.page-about .partner-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 28px;
  letter-spacing: 0.02em;
  color: var(--amber);
}

.page-about .partner-card h3 {
  margin: 6px 0 8px;
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-field);
}

.page-about .partner-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--moss);
}

.page-about .boundary {
  margin: 22px 0 0;
  padding: 16px 20px;
  border: 1px solid var(--paper-line);
  border-left: 3px solid var(--ember);
  border-radius: var(--radius-md);
  background: var(--paper-raise);
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--ink-green);
  max-width: 44em;
}

/* ---------- 联系 ---------- */
.page-about .contact-card {
  margin-top: 26px;
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--radius-lg);
  background: var(--ink-green);
  color: var(--paper);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .contact-rows {
  margin: 0;
  display: grid;
  gap: 12px;
}

.page-about .contact-rows > div {
  display: grid;
  grid-template-columns: minmax(0, 74px) minmax(0, 1fr);
  gap: 12px;
}

.page-about .contact-rows dt {
  font-size: 13px;
  line-height: 1.7;
  color: rgba(243, 238, 225, 0.6);
}

.page-about .contact-rows dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--paper);
  word-break: break-word;
}

.page-about .contact-card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: end;
}

/* ---------- 正文内链 ---------- */
.page-about .culture-flow a:not(.btn) {
  color: var(--ink-teal);
  text-decoration: underline;
  text-decoration-color: var(--cyan);
  text-underline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .hue-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 700px) {
  .page-about .partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .line-card--media .line-card__grid {
    grid-template-columns: minmax(0, 0.4fr) minmax(0, 1fr);
    gap: 24px;
    align-items: start;
  }

  .page-about .contact-card {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .page-about .culture-hero__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: center;
    gap: clamp(32px, 4vw, 56px);
  }

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

  .page-about .hue-strip {
    grid-template-columns: repeat(8, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) and (min-height: 720px) {
  .page-about .culture-rail {
    position: sticky;
    top: 96px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .rail-nav .toc-link,
  .page-about .year-scale a {
    transition: none;
  }
}
</main>