.page-about {
  --about-pad: clamp(42px, 8vw, 88px);
  background: var(--bg);
  color: var(--text);
  padding-bottom: clamp(40px, 8vw, 88px);
}

.page-about .breadcrumb {
  padding-top: clamp(14px, 3vw, 26px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(18px, 3vw, 34px) 0 clamp(30px, 6vw, 64px);
  background:
    radial-gradient(780px 400px at 84% -12%, rgba(43, 230, 208, 0.16), transparent 68%),
    radial-gradient(620px 340px at 2% 104%, rgba(255, 122, 47, 0.13), transparent 70%);
}

.page-about .about-hero-grid {
  display: grid;
  gap: 24px;
  min-width: 0;
}

.page-about .about-index-label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-index-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index-link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 4px 0;
  font-size: 13px;
  color: var(--line-white);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--step) var(--ease), border-color var(--step) var(--ease);
}

.page-about .about-index-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--orange);
}

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

.page-about .about-index-link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .about-index-note {
  display: none;
}

.page-about .about-kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 7vw, 60px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-h1-em {
  font-style: normal;
  color: var(--amber);
}

.page-about .about-lede {
  max-width: 60ch;
  margin: 0 0 26px;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.9;
  color: var(--line-white);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 28px;
  padding: 0;
  list-style: none;
  background: var(--hair);
  border: 1px solid var(--hair);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

.page-about .about-fact {
  padding: 16px 16px 14px;
  background: rgba(11, 32, 54, 0.72);
}

.page-about .about-fact-value {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.6rem;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-fact-label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-media {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(43, 230, 208, 0.28);
}

.page-about .about-media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-hero-media {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
}

/* ---------- 斜线分隔 ---------- */
.page-about .about-slash {
  height: 2px;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--track) 44%, transparent 94%);
  transform: skewY(-1.2deg);
  transform-origin: left center;
  opacity: 0.85;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  position: relative;
  padding: var(--about-pad) 0;
  scroll-margin-top: 110px;
}

.page-about .about-section:target::before {
  content: "";
  position: absolute;
  inset: 0 calc(-1 * var(--gutter));
  background: linear-gradient(180deg, rgba(43, 230, 208, 0.09), transparent 68%);
  pointer-events: none;
}

.page-about .about-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(22px, 4vw, 40px);
}

.page-about .about-mark {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-title {
  position: relative;
  display: inline-block;
  margin: 0;
  padding-right: 30px;
  font-family: var(--font-display);
  font-size: clamp(23px, 4.4vw, 38px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--paper);
  transition: color var(--step) var(--ease);
}

.page-about .about-title::after {
  content: "↗";
  position: absolute;
  top: 0.14em;
  right: 0;
  font-size: 0.62em;
  color: var(--cyan);
  opacity: 0;
  transform: translateX(-8px);
  transition: opacity var(--step) var(--ease), transform var(--step) var(--ease);
}

.page-about .about-head:hover .about-title::after,
.page-about .about-head:focus-within .about-title::after {
  opacity: 1;
  transform: translateX(0);
}

.page-about .about-section:target .about-title {
  color: var(--cyan);
}

.page-about .about-note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- 三条主张 ---------- */
.page-about .belief-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .belief {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 10px 16px;
  padding: 26px 0;
  border-top: 1px solid var(--hair);
  transition: background-color var(--step) var(--ease);
}

.page-about .belief:last-child {
  border-bottom: 1px solid var(--hair);
}

.page-about .belief-num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  line-height: 1;
  color: var(--amber);
}

.page-about .belief-title {
  margin: 0;
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 600;
  color: var(--paper);
}

.page-about .belief-text {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--line-white);
}

/* ---------- 团队 ---------- */
.page-about .team-track {
  display: grid;
  gap: 16px;
}

.page-about .team-panel {
  padding: 24px 22px 26px;
  background: var(--card);
  border-top: 3px solid var(--cyan);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.page-about .team-panel:nth-child(2) {
  border-top-color: var(--orange);
}

.page-about .team-panel:nth-child(3) {
  border-top-color: var(--amber);
}

.page-about .team-tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .team-panel:nth-child(2) .team-tag {
  color: var(--orange);
}

.page-about .team-panel:nth-child(3) .team-tag {
  color: var(--amber);
}

.page-about .team-title {
  margin: 0 0 10px;
  font-size: 18px;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .team-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--line-white);
}

/* ---------- 更新节奏（暖纸色带） ---------- */
.page-about .about-band {
  background: var(--paper);
  color: var(--pitch);
}

.page-about .about-band .about-title {
  color: var(--pitch);
}

.page-about .about-band .about-mark {
  color: var(--track);
}

.page-about .about-band .about-note {
  color: rgba(7, 26, 18, 0.55);
}

.page-about .about-band .about-section:target .about-title,
.page-about .about-band:target .about-title {
  color: var(--track);
}

.page-about .rhythm-grid {
  display: grid;
  gap: 28px;
  align-items: center;
}

.page-about .rhythm-item {
  padding: 20px 0;
  border-top: 1px solid rgba(7, 26, 18, 0.18);
}

.page-about .rhythm-item:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .rhythm-key {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--track);
}

.page-about .rhythm-title {
  margin: 0 0 8px;
  font-size: clamp(17px, 2.3vw, 21px);
  color: var(--pitch);
}

.page-about .rhythm-text {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(7, 26, 18, 0.78);
}

.page-about .about-rhythm-media {
  border-color: rgba(7, 26, 18, 0.22);
}

/* ---------- 栏目演进 ---------- */
.page-about .stage-wrap {
  position: relative;
}

.page-about .stage-aside {
  display: none;
}

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

.page-about .stage {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 12px 18px;
  padding: 26px 0;
  border-bottom: 1px solid var(--hair);
}

.page-about .stage:first-child {
  border-top: 1px solid var(--hair);
}

.page-about .stage-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1;
  color: var(--amber);
}

.page-about .stage-title {
  margin: 0 0 10px;
  font-size: clamp(17px, 2.3vw, 21px);
  color: var(--paper);
}

.page-about .stage-text {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--line-white);
}

/* ---------- 合作与覆盖 ---------- */
.page-about .about-ink {
  background: var(--ink-blue);
}

.page-about .coverage-grid {
  display: grid;
  gap: 28px;
  min-width: 0;
}

.page-about .coverage-text {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--line-white);
}

.page-about .coverage-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
  margin: 24px 0 26px;
  padding: 20px 0 0;
  list-style: none;
  border-top: 2px solid var(--orange);
}

.page-about .coverage-value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3.2vw, 1.9rem);
  line-height: 1;
  color: var(--amber);
}

.page-about .coverage-label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .coverage-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 22px;
}

.page-about .coverage-actions .link-trail {
  font-size: 14px;
}

.page-about .coverage-tail {
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--hair);
  font-size: 14px;
  line-height: 1.9;
  color: var(--muted);
}

.page-about .coverage-tail .link-trail {
  margin: 0;
}

.page-about .btn:focus-visible,
.page-about .link-trail:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .belief {
    grid-template-columns: 68px minmax(0, 1fr);
  }

  .page-about .belief-num {
    font-size: 1.9rem;
  }

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

@media (min-width: 900px) {
  .page-about .team-track {
    grid-template-columns: 1.15fr 1fr 0.92fr;
    gap: 18px;
    align-items: start;
  }

  .page-about .team-panel:nth-child(2) {
    margin-top: 30px;
  }

  .page-about .rhythm-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: clamp(30px, 5vw, 64px);
  }

  .page-about .coverage-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: clamp(30px, 5vw, 60px);
    align-items: start;
  }

  .page-about .about-title {
    padding-right: 36px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero-grid {
    grid-template-columns: 224px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 132px;
    padding-top: 14px;
    border-top: 2px solid var(--orange);
  }

  .page-about .about-index-list {
    flex-direction: column;
    gap: 12px;
  }

  .page-about .about-index-link {
    font-size: 14px;
  }

  .page-about .about-index-note {
    display: block;
    writing-mode: vertical-rl;
    margin: 26px 0 0;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.32em;
    color: var(--track);
  }

  .page-about .stage-aside {
    display: block;
    position: absolute;
    top: 8px;
    right: 0;
    margin: 0;
  }

  .page-about .stage {
    grid-template-columns: 92px minmax(0, 1fr);
    padding: 32px 0;
  }
}

@media (min-width: 1180px) {
  .page-about .belief:nth-child(even) {
    padding-left: 46px;
  }
}