.page-about {
  --about-rail: 96px;
  padding-top: 0;
  background: var(--sand);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
  margin: 0;
}

.page-about p {
  margin: 0 0 1em;
  line-height: 1.8;
}

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

.page-about a {
  color: inherit;
}

.page-about .mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  background: var(--navy);
  color: var(--paper);
  padding: calc(var(--header-h) + 44px) 0 48px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -34%;
  right: -24%;
  width: 78vw;
  height: 78vw;
  max-width: 720px;
  max-height: 720px;
  background: radial-gradient(circle at 50% 50%, rgba(255, 107, 74, 0.5), rgba(255, 107, 74, 0) 66%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -18%;
  bottom: -42%;
  width: 62vw;
  height: 62vw;
  max-width: 560px;
  max-height: 560px;
  background: radial-gradient(circle at 50% 50%, rgba(95, 224, 176, 0.26), rgba(95, 224, 176, 0) 68%);
  pointer-events: none;
}

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

.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: rgba(255, 253, 248, 0.7);
  margin-bottom: 28px;
}

.page-about .about-crumb a {
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 253, 248, 0.35);
}

.page-about .about-crumb a:hover {
  color: var(--mint);
  border-bottom-color: var(--mint);
}

.page-about .about-hero__kicker {
  font-size: 12px;
  color: var(--mint);
  margin: 0 0 14px;
  text-transform: uppercase;
}

.page-about .about-hero__title {
  font-size: clamp(2.1rem, 8vw, 4.4rem);
  line-height: 1.14;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-hero__title br {
  display: none;
}

.page-about .about-hero__lede {
  max-width: 58ch;
  margin-top: 22px;
  font-size: 1rem;
  line-height: 1.9;
  color: rgba(255, 253, 248, 0.86);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__actions .btn {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  padding: 0 22px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  transition: transform 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .about-hero__actions .btn--primary {
  background: var(--coral);
  color: var(--navy-deep);
}

.page-about .about-hero__actions .btn--ghost {
  border: 1px solid rgba(255, 253, 248, 0.5);
  color: var(--paper);
}

.page-about .about-hero__actions .btn:hover {
  transform: translateY(-2px);
}

.page-about .about-hero__actions .btn--ghost:hover {
  border-color: var(--mint);
  color: var(--mint);
}

.page-about .about-facts {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 40px auto 0;
  padding-top: 26px;
  border-top: 1px solid rgba(255, 253, 248, 0.18);
}

.page-about .about-facts__item {
  min-width: 0;
}

.page-about .about-facts__num {
  display: block;
  font-size: clamp(1.4rem, 5vw, 1.9rem);
  color: var(--mint);
  line-height: 1.2;
}

.page-about .about-facts__label {
  margin: 6px 0 0;
  font-size: 13px;
  color: rgba(255, 253, 248, 0.72);
}

/* ---------- 章节索引 ---------- */

.page-about .about-index {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: var(--header-h);
  z-index: 5;
}

.page-about .about-index__inner {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-top: 10px;
  padding-bottom: 10px;
  scrollbar-width: none;
}

.page-about .about-index__inner::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__link {
  flex: 0 0 auto;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-size: 13px;
  font-family: var(--font-mono);
  text-decoration: none;
  color: var(--muted);
  white-space: nowrap;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--navy);
  border-color: var(--coral);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-section {
  padding: 52px 0;
}

.page-about .about-section--warm {
  background: var(--paper);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-section--dark {
  background: var(--navy-deep);
  color: var(--paper);
}

.page-about .about-section--promise {
  background: linear-gradient(160deg, var(--sand) 0%, #EDE7DE 100%);
}

.page-about .chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .chapter__rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--coral);
}

.page-about .chapter__num {
  font-size: 1.8rem;
  color: var(--coral);
  line-height: 1;
}

.page-about .chapter__key {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.14em;
}

.page-about .chapter__body {
  min-width: 0;
}

.page-about .chapter__title {
  font-size: clamp(1.7rem, 6vw, 2.6rem);
  line-height: 1.24;
  color: var(--navy);
}

.page-about .chapter__title br {
  display: none;
}

.page-about .chapter__lede {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--navy);
  margin-top: 16px;
  padding-left: 14px;
  border-left: 3px solid var(--coral-soft);
}

.page-about .chapter__text {
  margin-top: 20px;
  max-width: 62ch;
}

.page-about .chapter__text p {
  font-size: 1rem;
  color: var(--ink);
}

.page-about .callout {
  margin-top: 24px;
  max-width: 62ch;
  background: var(--mint-soft);
  color: var(--ink);
  border-left: 4px solid var(--mint);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 16px 18px;
  font-size: 15px;
  line-height: 1.75;
}

.page-about .chapter__linkline {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin-top: 26px;
}

.page-about .chapter__linkline a {
  font-size: 15px;
  font-weight: 700;
  color: var(--navy);
  text-decoration: none;
  border-bottom: 2px solid var(--coral);
  padding-bottom: 2px;
}

.page-about .chapter__linkline a:hover {
  color: var(--coral);
}

/* ---------- 深色章节标题 ---------- */

.page-about .section-head {
  max-width: 62ch;
  margin-bottom: 28px;
}

.page-about .section-head .eyebrow {
  font-size: 12px;
  color: var(--mint);
  margin: 0 0 12px;
  letter-spacing: 0.1em;
}

.page-about .section-head__title {
  font-size: clamp(1.7rem, 6vw, 2.7rem);
  line-height: 1.24;
  color: var(--paper);
}

.page-about .section-head__title br {
  display: none;
}

.page-about .section-head__lede {
  margin-top: 16px;
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(255, 253, 248, 0.78);
}

/* ---------- 图片 ---------- */

.page-about .about-figure,
.page-about .team-figure,
.page-about .hebei-figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  background: linear-gradient(140deg, var(--navy) 0%, var(--navy-deep) 100%);
}

.page-about .about-figure img,
.page-about .team-figure img,
.page-about .hebei-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure {
  margin-bottom: 28px;
}

/* ---------- 时间线 ---------- */

.page-about .timeline {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 16px;
  scrollbar-color: var(--coral) rgba(255, 253, 248, 0.12);
  scrollbar-width: thin;
}

.page-about .timeline::-webkit-scrollbar {
  height: 6px;
}

.page-about .timeline::-webkit-scrollbar-thumb {
  background: var(--coral);
  border-radius: 999px;
}

.page-about .timeline__item {
  flex: 0 0 76vw;
  max-width: 300px;
  scroll-snap-align: start;
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--radius);
  padding: 20px 18px;
  border-top: 4px solid var(--coral);
}

.page-about .timeline__year {
  font-size: 1.5rem;
  color: var(--coral);
  margin: 0 0 10px;
}

.page-about .timeline__trigger,
.page-about .team-item__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  min-height: 44px;
  padding: 0;
  background: transparent;
  border: 0;
  cursor: pointer;
  text-align: left;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 1rem;
  line-height: 1.4;
}

.page-about .timeline__mark {
  position: relative;
  flex: 0 0 20px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--coral-soft);
}

.page-about .timeline__mark::before,
.page-about .timeline__mark::after {
  content: "";
  position: absolute;
  background: var(--navy);
  transition: opacity 0.18s var(--ease);
}

.page-about .timeline__mark::before {
  left: 5px;
  right: 5px;
  top: 9px;
  height: 2px;
}

.page-about .timeline__mark::after {
  top: 5px;
  bottom: 5px;
  left: 9px;
  width: 2px;
}

.page-about .timeline__item.is-open .timeline__mark::after {
  opacity: 0;
}

.page-about .timeline__panel {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .timeline__trigger:focus-visible,
.page-about .team-item__trigger:focus-visible,
.page-about .promise .tabs__btn:focus-visible,
.page-about .about-index__link:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: 8px;
}

/* ---------- 团队 ---------- */

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-top: 24px;
}

.page-about .team-copy p {
  font-size: 1rem;
  color: var(--ink);
  max-width: 56ch;
}

.page-about .team-roles {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 20px;
}

.page-about .team-role {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 14px 12px;
  text-align: center;
}

.page-about .team-role__num {
  display: block;
  font-size: 1.6rem;
  color: var(--navy);
  line-height: 1.1;
}

.page-about .team-role__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  color: var(--muted);
}

.page-about .team-stack {
  display: grid;
  gap: 10px;
  margin-top: 28px;
}

.page-about .team-item {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 6px 16px;
}

.page-about .team-item__trigger {
  font-size: 0.98rem;
  padding: 12px 0;
}

.page-about .team-item__plus {
  position: relative;
  flex: 0 0 18px;
  width: 18px;
  height: 18px;
  border-radius: 6px;
  background: var(--mint-soft);
}

.page-about .team-item__plus::before,
.page-about .team-item__plus::after {
  content: "";
  position: absolute;
  background: var(--navy);
  transition: opacity 0.18s var(--ease);
}

.page-about .team-item__plus::before {
  left: 4px;
  right: 4px;
  top: 8px;
  height: 2px;
}

.page-about .team-item__plus::after {
  top: 4px;
  bottom: 4px;
  left: 8px;
  width: 2px;
}

.page-about .team-item.is-open .team-item__plus::after {
  opacity: 0;
}

.page-about .team-item__panel {
  padding: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 内容清单 ---------- */

.page-about .craft-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .craft-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding-bottom: 18px;
  border-bottom: 1px dashed var(--line);
}

.page-about .craft-item:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .craft-item__num {
  font-size: 1.1rem;
  color: var(--coral);
  padding-top: 2px;
}

.page-about .craft-item__title {
  font-size: 1.08rem;
  color: var(--navy);
  margin-bottom: 8px;
}

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

/* ---------- 河北 ---------- */

.page-about .hebei-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-top: 24px;
}

.page-about .hebei-copy p {
  font-size: 1rem;
  color: var(--ink);
  max-width: 56ch;
}

.page-about .hebei-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .hebei-list li {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .hebei-list .mono {
  font-size: 12px;
  color: var(--navy);
  background: var(--mint-soft);
  border-radius: 6px;
  padding: 3px 6px;
  text-align: center;
}

/* ---------- 原则 Tabs ---------- */

.page-about .promise {
  margin-top: 26px;
}

.page-about .promise .tabs__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.page-about .promise .tabs__btn {
  min-height: 44px;
  padding: 0 20px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 253, 248, 0.72);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .promise .tabs__btn.is-active {
  background: var(--coral);
  border-color: var(--coral);
  color: var(--navy-deep);
}

.page-about .promise .tabs__panel {
  display: none;
}

.page-about .promise .tabs__panel.is-active {
  display: block;
}

.page-about .promise__panel {
  background: rgba(255, 253, 248, 0.82);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-left: 4px solid var(--coral);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 22px 20px;
  box-shadow: var(--shadow-card);
  max-width: 66ch;
}

.page-about .promise__panel h3 {
  font-size: 1.15rem;
  color: var(--navy);
  margin-bottom: 12px;
}

.page-about .promise__panel p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .promise__link a {
  font-weight: 700;
  color: var(--navy);
  text-decoration: none;
  border-bottom: 2px solid var(--mint);
}

.page-about .promise__link a:hover {
  color: var(--coral);
}

/* ---------- 结尾 ---------- */

.page-about .about-cta {
  background: var(--navy);
  color: var(--paper);
  padding: 56px 0;
  position: relative;
  overflow: hidden;
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  right: -18%;
  top: -50%;
  width: 56vw;
  height: 56vw;
  max-width: 480px;
  max-height: 480px;
  background: radial-gradient(circle at 50% 50%, rgba(95, 224, 176, 0.24), rgba(95, 224, 176, 0) 66%);
  pointer-events: none;
}

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

.page-about .about-cta__title {
  font-size: clamp(1.6rem, 5.5vw, 2.3rem);
  color: var(--paper);
  line-height: 1.3;
}

.page-about .about-cta__text {
  margin-top: 16px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(255, 253, 248, 0.82);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.page-about .about-cta__actions .btn {
  display: inline-flex;
  align-items: center;
  min-height: 46px;
  padding: 0 20px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: transform 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .about-cta__actions .btn--primary {
  background: var(--coral);
  color: var(--navy-deep);
}

.page-about .about-cta__actions .btn--mint {
  background: var(--mint);
  color: var(--navy-deep);
}

.page-about .about-cta__actions .btn--quiet {
  background: rgba(255, 253, 248, 0.12);
  color: var(--paper);
}

.page-about .about-cta__actions .btn--ghost {
  border: 1px solid rgba(255, 253, 248, 0.5);
  color: var(--paper);
}

.page-about .about-cta__actions .btn:hover {
  transform: translateY(-2px);
}

/* ---------- 断点 ---------- */

@media (min-width: 720px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 64px) 0 56px;
  }

  .page-about .about-hero__title br,
  .page-about .chapter__title br,
  .page-about .section-head__title br {
    display: inline;
  }

  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-section {
    padding: 72px 0;
  }

  .page-about .timeline__item {
    flex: 0 0 320px;
    max-width: 320px;
  }

  .page-about .team-grid,
  .page-about .hebei-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
    gap: 30px;
  }

  .page-about .hebei-figure {
    order: 2;
  }

  .page-about .promise__panel {
    padding: 28px 26px;
  }

  .page-about .about-cta {
    padding: 72px 0;
  }
}

@media (min-width: 960px) {
  .page-about .chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    position: sticky;
    top: calc(var(--header-h) + 24px);
    border-bottom: 0;
    border-left: 3px solid var(--coral);
    padding: 0 0 0 14px;
  }

  .page-about .chapter__key {
    writing-mode: horizontal-tb;
    letter-spacing: 0.2em;
  }

  .page-about .chapter__title {
    font-size: 2.5rem;
  }

  .page-about .chapter__lede {
    font-size: 1.2rem;
    max-width: 40ch;
  }

  .page-about .chapter__text {
    columns: 2;
    column-gap: 36px;
    max-width: none;
  }

  .page-about .chapter__text p {
    break-inside: avoid;
  }

  .page-about .about-figure {
    margin-bottom: 34px;
  }

  .page-about .timeline {
    gap: 18px;
  }

  .page-about .timeline__item {
    flex: 0 0 340px;
    max-width: 340px;
    padding: 24px 22px;
  }

  .page-about .craft-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px 34px;
  }

  .page-about .craft-item {
    border-bottom: 0;
    padding-bottom: 0;
  }

  .page-about .about-cta__actions .btn {
    padding: 0 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}