.page-about {
  --about-line: rgba(74, 101, 114, 0.45);
  --about-soft: rgba(74, 101, 114, 0.22);
  --about-veil: rgba(6, 26, 43, 0.9);
  background: var(--ink-900);
  color: var(--paper-100);
  overflow-x: hidden;
  padding-bottom: 0;
}

.page-about a {
  color: var(--accent-200);
  text-underline-offset: 4px;
}

.page-about a:focus-visible {
  outline: 2px solid var(--accent-400);
  outline-offset: 3px;
}

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

.page-about .breadcrumb {
  padding-top: 18px;
}

.page-about .about-section {
  position: relative;
  padding-block: clamp(48px, 8vw, 100px);
}

.page-about .about-section__intro {
  max-width: 62ch;
  margin: 14px 0 0;
  color: var(--mist-300);
  font-size: 16px;
  line-height: 1.75;
}

.page-about .section-head {
  margin-bottom: 4px;
}

.page-about .section-title {
  color: var(--paper-100);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero__media {
  position: relative;
  height: clamp(220px, 44vw, 420px);
  overflow: hidden;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.68) saturate(0.85);
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(6, 26, 43, 0.55) 0%, rgba(6, 26, 43, 0.18) 42%, rgba(6, 26, 43, 0.96) 100%),
    repeating-linear-gradient(90deg, transparent 0 95px, rgba(61, 224, 200, 0.08) 95px 96px);
}

.page-about .about-hero__panel {
  position: relative;
  margin-top: -36px;
  background: var(--ink-700);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--accent-400);
  padding: clamp(20px, 3.4vw, 36px);
}

.page-about .about-hero__panel .blueprint-meta {
  margin-bottom: 14px;
}

.page-about .about-hero__title {
  margin: 0;
  font-size: clamp(28px, 6.4vw, 58px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--paper-100);
}

.page-about .about-hero__lede {
  margin: 16px 0 0;
  max-width: 58ch;
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.75;
  color: var(--mist-300);
}

/* ---------- 01 起点 ---------- */

.page-about .about-origin__cols {
  display: grid;
  gap: 26px;
  margin-top: 26px;
}

.page-about .about-origin__main p {
  margin: 0 0 16px;
  max-width: 66ch;
  color: var(--mist-300);
  font-size: 16px;
  line-height: 1.78;
}

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

.page-about .about-origin__aside {
  border-top: 1px solid var(--about-line);
  padding-top: 18px;
}

.page-about .about-origin__mark {
  margin: 0 0 8px;
  font-size: 20px;
  letter-spacing: 0.06em;
  color: var(--accent-400);
}

.page-about .about-origin__note {
  margin: 0;
  color: var(--mist-300);
  font-size: 15px;
  line-height: 1.72;
}

/* ---------- 02 时间轴 ---------- */

.page-about .about-timeline {
  overflow: hidden;
  border-top: 1px solid var(--about-soft);
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.page-about .about-timeline__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.09;
  filter: grayscale(0.35) contrast(1.1);
}

.page-about .tl {
  position: relative;
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 30px;
  bottom: 40px;
  width: 1px;
  background: var(--about-line);
}

.page-about .tl__item {
  position: relative;
  padding: 0 0 14px 26px;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 26px;
  width: 9px;
  height: 9px;
  border: 1px solid var(--accent-400);
  background: var(--ink-900);
  transform: rotate(45deg);
  transition: background-color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .tl__item:hover::before,
.page-about .tl__item:focus-within::before {
  background: var(--accent-400);
  border-color: var(--accent-200);
}

.page-about .tl__stamp {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 20px 0 2px;
}

.page-about .tl__year {
  font-size: 15px;
  letter-spacing: 0.14em;
  color: var(--accent-400);
}

.page-about .tl__details {
  border-top: 1px solid var(--about-line);
}

.page-about .tl__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 0;
  list-style: none;
  cursor: pointer;
  font-size: clamp(16px, 2.2vw, 20px);
  font-weight: 800;
  line-height: 1.45;
  color: var(--paper-100);
  transition: color var(--t-fast) var(--ease);
}

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

.page-about .tl__summary::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 18px;
  line-height: 1;
  color: var(--accent-400);
}

.page-about .tl__details[open] > .tl__summary::after {
  content: "−";
}

.page-about .tl__summary:hover {
  color: var(--accent-200);
}

.page-about .tl__summary:focus-visible {
  outline: 2px solid var(--accent-400);
  outline-offset: 3px;
}

.page-about .tl__panel {
  padding: 2px 0 20px;
  border-bottom: 1px solid var(--about-soft);
  animation: about-reveal 200ms var(--ease) both;
}

.page-about .tl__panel p {
  margin: 0;
  max-width: 64ch;
  color: var(--mist-300);
  font-size: 15.5px;
  line-height: 1.78;
}

@keyframes about-reveal {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 03 四条主线 ---------- */

.page-about .lines {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .lines__item {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  grid-template-areas:
    "num title"
    "num body";
  gap: 4px 14px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-line);
  transition: border-color var(--t-fast) var(--ease);
}

.page-about .lines__item:hover {
  border-bottom-color: var(--accent-200);
}

.page-about .lines__num {
  grid-area: num;
  padding-top: 4px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--coral-500);
  transition: color var(--t-fast) var(--ease);
}

.page-about .lines__item:hover .lines__num {
  color: var(--accent-400);
}

.page-about .lines__title {
  grid-area: title;
  margin: 0;
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 800;
  letter-spacing: -0.005em;
  color: var(--paper-100);
}

.page-about .lines__body {
  grid-area: body;
  margin: 6px 0 0;
  max-width: 68ch;
  color: var(--mist-300);
  font-size: 15.5px;
  line-height: 1.78;
}

/* ---------- 04 团队 ---------- */

.page-about .about-team {
  background: var(--teal-600);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 4vw, 46px);
}

.page-about .about-team__copy p {
  margin: 16px 0 0;
  max-width: 62ch;
  color: var(--mist-300);
  font-size: 15.5px;
  line-height: 1.78;
}

.page-about .about-team__fig {
  margin: 0;
  border: 1px solid var(--about-line);
  background: var(--ink-900);
  overflow: hidden;
}

.page-about .about-team__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  filter: brightness(0.86) saturate(0.9);
}

.page-about .about-team__fig figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--about-line);
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist-300);
}

.page-about .team-bars {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .team-bars__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "name num"
    "track track";
  gap: 8px 14px;
  align-items: center;
  padding: 10px 0;
  border-top: 1px solid var(--about-soft);
  transition: border-color var(--t-fast) var(--ease);
}

.page-about .team-bars__row:last-child {
  border-bottom: 1px solid var(--about-soft);
}

.page-about .team-bars__row:hover {
  border-top-color: var(--accent-200);
}

.page-about .team-bars__name {
  grid-area: name;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper-100);
}

.page-about .team-bars__num {
  grid-area: num;
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--accent-200);
  transition: color var(--t-fast) var(--ease);
}

.page-about .team-bars__row:hover .team-bars__num {
  color: var(--coral-500);
}

.page-about .team-bars__track {
  grid-area: track;
  display: block;
  position: relative;
  height: 12px;
  border: 1px solid var(--about-line);
  background: rgba(242, 246, 247, 0.08);
  overflow: hidden;
}

.page-about .team-bars__fill {
  display: block;
  height: 100%;
  opacity: 0.9;
  transition: opacity var(--t-fast) var(--ease), filter var(--t-fast) var(--ease);
}

.page-about .team-bars__row:hover .team-bars__fill {
  opacity: 1;
  filter: brightness(1.15);
}

.page-about .team-bars__row:nth-child(1) .team-bars__fill {
  width: 40%;
  background: var(--accent-400);
}

.page-about .team-bars__row:nth-child(2) .team-bars__fill {
  width: 26.7%;
  background: var(--accent-200);
}

.page-about .team-bars__row:nth-child(3) .team-bars__fill {
  width: 20%;
  background: var(--coral-500);
}

.page-about .team-bars__row:nth-child(4) .team-bars__fill {
  width: 13.3%;
  background: var(--mist-300);
}

/* ---------- 05 维护标准 ---------- */

.page-about .upkeep {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .upkeep__row {
  display: grid;
  gap: 6px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .upkeep__key {
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--accent-400);
}

.page-about .upkeep__val {
  margin: 0;
  max-width: 68ch;
  color: var(--mist-300);
  font-size: 15.5px;
  line-height: 1.78;
}

/* ---------- 06 合作 ---------- */

.page-about .about-partners__layout {
  display: grid;
  gap: 24px;
  margin-top: 26px;
}

.page-about .about-partners__text {
  margin: 0;
  max-width: 62ch;
  color: var(--mist-300);
  font-size: 15.5px;
  line-height: 1.78;
}

.page-about .about-partners__panel p {
  margin: 0 0 16px;
  color: var(--paper-100);
  font-size: 15.5px;
  line-height: 1.75;
}

.page-about .about-partners__panel .btn {
  display: inline-block;
}

/* ---------- 延伸入口 ---------- */

.page-about .about-next {
  border-top: 1px solid var(--about-line);
  padding-bottom: clamp(56px, 8vw, 96px);
}

.page-about .about-next .section-title {
  margin: 0 0 18px;
}

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

.page-about .about-next__link {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-line);
  color: var(--paper-100);
  text-decoration: none;
  font-size: clamp(16px, 2.6vw, 22px);
  font-weight: 800;
  line-height: 1.4;
  transition: color var(--t-fast) var(--ease), padding-left var(--t-fast) var(--ease);
}

.page-about .about-next__link .mono {
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.14em;
  color: var(--accent-400);
}

.page-about .about-next__link::after {
  content: "→";
  margin-left: auto;
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--accent-400);
}

.page-about .about-next__link:hover {
  color: var(--accent-200);
  padding-left: 8px;
}

.page-about .about-next__back {
  margin: 28px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
}

.page-about .about-next__back a {
  color: var(--mist-300);
}

/* ---------- 断点 ---------- */

@media (min-width: 780px) {
  .page-about .about-origin__cols {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-origin__aside {
    border-top: none;
    border-left: 1px solid var(--about-line);
    padding-top: 0;
    padding-left: 24px;
  }

  .page-about .upkeep__row {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 28px;
    align-items: baseline;
  }

  .page-about .about-partners__layout {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-hero__panel {
    margin-top: -56px;
  }
}

@media (min-width: 900px) {
  .page-about .tl__item {
    display: grid;
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 0 34px;
    padding: 0 0 16px 34px;
  }

  .page-about .tl__item::before {
    top: 30px;
  }

  .page-about .tl__stamp {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding: 24px 0 0;
  }

  .page-about .tl__year {
    font-size: 26px;
    letter-spacing: 0.03em;
    color: var(--paper-100);
  }

  .page-about .lines__item {
    grid-template-columns: 60px 210px minmax(0, 1fr);
    grid-template-areas: "num title body";
    align-items: baseline;
    gap: 0 28px;
    padding: 26px 0;
  }

  .page-about .lines__num {
    padding-top: 0;
    font-size: 14px;
  }

  .page-about .lines__body {
    margin-top: 0;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
  }

  .page-about .team-bars {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px 40px;
  }

  .page-about .team-bars__row {
    grid-template-columns: 104px minmax(0, 1fr) 62px;
    grid-template-areas: "name track num";
    gap: 14px;
    border-bottom: none;
    padding: 12px 0;
  }

  .page-about .team-bars__row:last-child {
    border-bottom: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__panel {
    animation: none;
  }

  .page-about .about-next__link,
  .page-about .tl__summary,
  .page-about .team-bars__fill {
    transition: none;
  }

  .page-about .about-next__link:hover {
    padding-left: 0;
  }
}

已按秩序完成「品牌文化」页面的主体 HTML 与专属 CSS 同步创作。页面以纵向时间轴为主轴，年份刻度固定在左侧，中段插入深蓝绿分区展示团队构成与条形比例图，首屏采用通栏夜景图加左侧叙事面板，整体沿用深海蓝底色、荧光青绿高亮与珊瑚橙警示标记，配合细线网格与等宽字体形成赛场蓝图般的秩序感。时间轴节点使用原生 details 实现点击展开，不依赖脚本仍可完整阅读；延伸入口做成整行细线链接而非卡片阵列，移动端优先并通过媒体查询在 780px 与 900px 处调整栅格与横条布局。文案围绕栏目名前置的由来、四次改版节点、四条主线的使用场景、海口团队分工、条目维护节奏与数据协作展开，未复用页面规划术语或元数据片段，所有数字与表述均来自给定事实。