/* ===== 品牌自述 · 页面专属样式 ===== */
.page-about {
  --about-gap: clamp(64px, 9vw, 118px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .about-section {
  margin-top: var(--about-gap);
  scroll-margin-top: 132px;
}

/* --- 首屏刊头式框景 --- */
.page-about .about-hero {
  position: relative;
  margin-top: clamp(20px, 4vw, 44px);
  padding: clamp(22px, 4vw, 48px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(110, 86, 255, .22), transparent 58%),
    radial-gradient(90% 72% at 0% 100%, rgba(43, 227, 198, .12), transparent 62%),
    var(--panel);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.95rem, 6.6vw, 4.3rem);
  line-height: 1.06;
  letter-spacing: -.02em;
  margin: 14px 0 18px;
  max-width: 20ch;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 64ch;
  color: var(--text);
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  line-height: 1.85;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(26px, 4vw, 42px);
  background: var(--line);
  border: var(--line-w) solid var(--line);
}

.page-about .about-facts__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  padding: 16px 18px;
  background: var(--panel-soft);
}

.page-about .about-facts__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.15rem, 3.4vw, 1.65rem);
  color: var(--cyan);
  letter-spacing: -.01em;
}

.page-about .about-facts__label {
  font-size: .84rem;
  line-height: 1.6;
  color: var(--muted);
}

/* --- 锚点索引 --- */
.page-about .about-index {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin-top: clamp(22px, 4vw, 34px);
  padding-top: 18px;
  border-top: 1px dashed var(--line);
}

.page-about .about-index a {
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .04em;
  color: var(--muted);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

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

/* --- 通用正文与双栏 --- */
.page-about .about-prose p {
  margin: 0 0 18px;
  max-width: 62ch;
  line-height: 1.85;
}

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

.page-about .about-note p:first-of-type::first-letter {
  float: left;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 3.3em;
  line-height: .84;
  padding: .06em .14em 0 0;
  color: var(--cyan);
}

.page-about .about-mission,
.page-about .about-split {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .about-split .about-prose {
  min-width: 0;
}

/* --- 常用动作侧栏 --- */
.page-about .mission-aside {
  padding: clamp(20px, 3vw, 28px);
  background: var(--panel-soft);
}

.page-about .mission-aside h3 {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .mission-aside ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .mission-aside li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 12px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .mission-aside li:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .mission-aside strong {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--amber);
}

.page-about .mission-aside span {
  color: var(--muted);
  font-size: .94rem;
  line-height: 1.72;
}

/* --- 资料来源列表 --- */
.page-about .source-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .source-list li {
  position: relative;
  display: grid;
  gap: 6px;
  padding: 14px 0 14px 22px;
  border-top: 1px solid var(--line);
}

.page-about .source-list li:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .source-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  width: 12px;
  height: 2px;
  background: var(--cyan);
}

.page-about .source-list__name {
  font-family: var(--font-mono);
  font-size: .88rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .source-list__desc {
  color: var(--muted);
  font-size: .94rem;
  line-height: 1.75;
}

/* --- 分段控件（校订工序） --- */
.page-about .tabs {
  margin-top: clamp(22px, 3vw, 30px);
  padding: clamp(20px, 3vw, 32px);
  background: var(--panel-soft);
  border: var(--line-w) solid var(--line);
}

.page-about .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(20px, 3vw, 28px);
  padding: 0;
  border: 0;
}

.page-about .tabs__tab {
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .04em;
  padding: 10px 16px;
  color: var(--muted);
  background: var(--ink-deep);
  border: var(--line-w) solid var(--line);
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .tabs__tab:hover {
  color: var(--text);
  border-color: var(--cyan);
}

.page-about .tabs__tab[aria-selected="true"] {
  color: var(--ink-deep);
  background: var(--cyan);
  border-color: var(--cyan);
  font-weight: 700;
}

.page-about .tabs__panel {
  outline: none;
  max-width: 68ch;
}

.page-about .tabs__panel[hidden] {
  display: none;
}

.page-about .tabs__panel:focus-visible {
  box-shadow: 0 0 0 2px var(--cyan);
}

.page-about .step-num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2rem, 6vw, 3rem);
  line-height: 1;
  color: rgba(43, 227, 198, .24);
}

.page-about .step-title {
  margin: 6px 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.25rem, 3vw, 1.7rem);
}

.page-about .tabs__panel > p {
  margin: 0;
  color: var(--text);
  line-height: 1.85;
}

.page-about .step-meta {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .step-meta li {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  font-size: .92rem;
}

.page-about .step-meta__key {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--amber);
  min-width: 46px;
}

.page-about .step-meta__val {
  color: var(--muted);
  line-height: 1.7;
}

/* --- 团队构成条 --- */
.page-about .team-bar {
  display: flex;
  border: var(--line-w) solid var(--line);
  min-height: 54px;
}

.page-about .team-bar__seg {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: .84rem;
  font-weight: 700;
  color: var(--ink-deep);
  min-width: 0;
}

.page-about .team-bar__seg--a { flex: 18 1 0; background: var(--cyan); }
.page-about .team-bar__seg--b { flex: 12 1 0; background: var(--violet); color: var(--text); }
.page-about .team-bar__seg--c { flex: 20 1 0; background: var(--amber); }
.page-about .team-bar__seg--d { flex: 8 1 0; background: var(--text); }

.page-about .team-legend {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .team-legend__item {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr);
  gap: 6px 12px;
  align-items: baseline;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .team-legend__dot {
  width: 12px;
  height: 12px;
  align-self: center;
}

.page-about .team-legend__dot--a { background: var(--cyan); }
.page-about .team-legend__dot--b { background: var(--violet); }
.page-about .team-legend__dot--c { background: var(--amber); }
.page-about .team-legend__dot--d { background: var(--text); }

.page-about .team-legend__name {
  font-family: var(--font-mono);
  font-size: .88rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .team-legend__desc {
  grid-column: 2;
  margin: 0;
  color: var(--muted);
  font-size: .93rem;
  line-height: 1.72;
}

/* --- 时间线 --- */
.page-about .milestones-banner {
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 34px 0 0;
  padding: 0 0 0 30px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(var(--amber), var(--line));
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 36px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 8px;
  width: 11px;
  height: 11px;
  background: var(--amber);
  transition: background .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .timeline__year {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: .9rem;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--amber);
}

.page-about .timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.1rem, 2.6vw, 1.42rem);
  color: var(--text);
}

.page-about .timeline__desc {
  margin: 0;
  max-width: 60ch;
  color: var(--muted);
  line-height: 1.8;
}

/* --- 合作生态刻度 --- */
.page-about .partner-scale {
  display: grid;
  gap: 1px;
  margin-top: clamp(22px, 3vw, 30px);
  background: var(--line);
  border: var(--line-w) solid var(--line);
}

.page-about .partner-scale__item {
  display: grid;
  gap: 8px;
  padding: clamp(20px, 3vw, 30px);
  background: var(--panel);
}

.page-about .partner-scale__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.7rem, 5vw, 2.6rem);
  line-height: 1;
  color: var(--cyan);
}

.page-about .partner-scale__label {
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .12em;
  color: var(--amber);
}

.page-about .partner-scale__item p {
  margin: 0;
  color: var(--muted);
  font-size: .95rem;
  line-height: 1.78;
}

.page-about .partner-action {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 22px;
  margin-top: 26px;
}

.page-about .partner-action p {
  margin: 0;
  flex: 1 1 320px;
  max-width: 58ch;
  color: var(--muted);
  line-height: 1.78;
}

/* --- 下一站 --- */
.page-about .about-next {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin-top: var(--about-gap);
  padding-top: 26px;
  border-top: var(--line-w) solid var(--line);
}

.page-about .about-next__label {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .14em;
  color: var(--muted);
  margin-right: 6px;
}

.page-about .about-next__link {
  display: inline-block;
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: .84rem;
  color: var(--text);
  text-decoration: none;
  background: var(--panel-soft);
  border: var(--line-w) solid var(--line);
  transition: color .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  transform: translate(-1px, -1px);
  box-shadow: var(--shadow-cyan);
}

/* --- 悬停增强 --- */
@media (hover: hover) {
  .page-about .timeline__item:hover::before {
    background: var(--cyan);
    box-shadow: 0 0 0 5px rgba(43, 227, 198, .18);
  }
}

/* --- 桌面栅格 --- */
@media (min-width: 760px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 960px) {
  .page-about .about-mission {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .9fr);
    align-items: start;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .about-split--team {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  }

  .page-about .timeline {
    padding-left: 96px;
  }

  .page-about .timeline::before {
    left: 43px;
  }

  .page-about .timeline__item::before {
    left: 38px;
  }

  .page-about .timeline__item {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 130px;
    grid-template-areas:
      "title year"
      "desc  year";
    align-items: start;
    column-gap: 20px;
  }

  .page-about .timeline__year {
    grid-area: year;
    text-align: right;
    margin-bottom: 0;
    padding-top: 6px;
  }

  .page-about .timeline__title { grid-area: title; }
  .page-about .timeline__desc { grid-area: desc; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    animation: none !important;
  }
}
</main>