.page-about {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 28px 0 40px;
  background: linear-gradient(180deg, var(--ink-deep) 0%, var(--ink) 78%);
  border-bottom: var(--line-dark);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(243, 235, 221, .055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(243, 235, 221, .055) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -30%;
  right: -12%;
  width: 62%;
  height: 130%;
  background: radial-gradient(closest-side, rgba(88, 242, 206, .16), transparent 72%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.page-about .about-crumbs {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--slate);
}

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

.page-about .about-crumbs a {
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--cyan);
  border-bottom-color: rgba(88, 242, 206, .5);
}

.page-about .about-crumbs li + li::before {
  content: "／";
  margin-right: 8px;
  color: rgba(143, 166, 178, .6);
}

.page-about .about-crumbs [aria-current="page"] {
  color: var(--paper);
}

.page-about .about-eyebrow {
  margin: 24px 0 0;
  color: var(--cyan);
  letter-spacing: .22em;
}

.page-about .about-title {
  margin: 14px 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 7vw, 60px);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-lead {
  max-width: 56ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(243, 235, 221, .82);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  background: rgba(243, 235, 221, .16);
  border: var(--line-dark);
}

.page-about .about-facts-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: var(--ink);
  transition: background 180ms var(--ease);
}

.page-about .about-facts-item:hover {
  background: var(--panel);
}

.page-about .about-facts-num {
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-facts-label {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--slate);
}

.page-about .about-hero-media {
  margin: 0;
  border: var(--line-dark);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
  overflow: hidden;
}

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

.page-about .about-hero-cap {
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--slate);
  border-top: var(--line-dark);
}

.page-about .about-quote-row {
  position: relative;
  z-index: 1;
  margin-top: 36px;
}

.page-about .about-quote {
  margin: 0;
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--cyan);
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(18px, 3.4vw, 26px);
  line-height: 1.6;
  color: var(--paper);
}

/* ---------- 主体：左时间轴 + 右内容 ---------- */
.page-about .about-body {
  background: var(--paper);
  color: var(--black);
  padding: 40px 0 56px;
}

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

.page-about .about-rail {
  padding-bottom: 4px;
  border-bottom: var(--line-light);
}

.page-about .about-rail-title {
  margin: 0 0 10px;
  color: var(--rust);
  letter-spacing: .2em;
}

.page-about .about-rail-list {
  position: relative;
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 12px;
  list-style: none;
  overflow-x: auto;
}

.page-about .about-rail-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: var(--line-light);
  border-radius: var(--radius);
  background: rgba(10, 36, 31, .035);
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
  font-size: 13px;
  transition: border-color 180ms var(--ease), background 180ms var(--ease), color 180ms var(--ease);
}

.page-about .about-rail-link:hover,
.page-about .about-rail-link:focus-visible {
  border-color: rgba(199, 91, 42, .6);
  background: rgba(255, 138, 61, .1);
  color: var(--rust);
}

.page-about .about-rail-num {
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--rust);
}

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

.page-about .about-chapter {
  padding: 30px 0 34px;
  border-top: var(--line-light);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 6px;
}

.page-about .chapter-kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--rust);
}

.page-about .chapter-kicker::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: rgba(10, 36, 31, .16);
}

.page-about .about-chapter h2 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 4.6vw, 36px);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .prose {
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(16, 24, 22, .86);
}

.page-about .prose p {
  margin: 0 0 14px;
}

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

.page-about .prose a {
  color: var(--rust);
  text-decoration: none;
  border-bottom: 1px solid rgba(199, 91, 42, .45);
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

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

/* 场景列表 */
.page-about .about-scenes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  background: rgba(10, 36, 31, .14);
  border: var(--line-light);
}

.page-about .about-scenes-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  background: var(--paper);
}

.page-about .about-scenes-k {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: .02em;
  color: var(--ink);
}

.page-about .about-scenes-v {
  font-size: 13px;
  line-height: 1.75;
  color: rgba(16, 24, 22, .72);
}

/* 团队数字 */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team-item {
  position: relative;
  padding: 18px 18px 16px;
  background: var(--paper-deep);
  border: var(--line-light);
  border-radius: var(--radius);
  transition: transform 180ms var(--ease), border-color 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .about-team-item:hover,
.page-about .about-team-item:focus-within,
.page-about .about-team-item:focus {
  transform: translateY(-2px);
  border-color: rgba(88, 242, 206, .55);
  box-shadow: var(--shadow);
}

.page-about .about-team-num {
  display: block;
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
  transition: color 180ms var(--ease);
}

.page-about .about-team-item:hover .about-team-num,
.page-about .about-team-item:focus .about-team-num {
  color: var(--rust);
}

.page-about .about-team-role {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--slate);
  text-transform: uppercase;
}

.page-about .about-team-note {
  margin: 12px 0 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 13px;
  line-height: 1.75;
  color: rgba(16, 24, 22, .8);
  transition: max-height 220ms var(--ease), opacity 220ms var(--ease), margin-top 220ms var(--ease);
}

.page-about .about-team-item:hover .about-team-note,
.page-about .about-team-item:focus .about-team-note,
.page-about .about-team-item:focus-within .about-team-note {
  max-height: 140px;
  opacity: 1;
}

/* 校验步骤 */
.page-about .about-steps {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: about-step;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid rgba(10, 36, 31, .12);
}

.page-about .about-step:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-about .about-step-num {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--rust);
  padding-top: 4px;
}

.page-about .about-step-body h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .01em;
  color: var(--ink);
}

.page-about .about-step-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(16, 24, 22, .78);
}

.page-about .about-verify-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 26px;
}

.page-about .about-figure {
  margin: 0;
  border: var(--line-light);
  border-radius: var(--radius);
  background: var(--slate-light);
  overflow: hidden;
}

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

.page-about .about-figure figcaption {
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.7;
  color: rgba(16, 24, 22, .68);
  border-top: var(--line-light);
}

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

.page-about .about-verify-note {
  padding: 18px;
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--radius);
  border-left: 3px solid var(--cyan);
}

.page-about .about-verify-lead {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-verify-note p:last-child {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: rgba(243, 235, 221, .78);
}

/* 里程碑 */
.page-about .about-miles {
  margin: 24px 0 0;
  padding: 0 0 0 18px;
  list-style: none;
  border-left: 1px solid rgba(10, 36, 31, .2);
}

.page-about .about-mile {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0 16px 14px;
  transition: background 180ms var(--ease);
}

.page-about .about-mile::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 22px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--paper);
  border: 1px solid rgba(10, 36, 31, .45);
  transition: background 180ms var(--ease), border-color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .about-mile:hover::before,
.page-about .about-mile:focus::before {
  background: var(--orange);
  border-color: var(--rust);
  transform: scale(1.25);
}

.page-about .about-mile-year {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--rust);
}

.page-about .about-mile-body h3 {
  margin: 2px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .01em;
  color: var(--ink);
}

.page-about .about-mile-note {
  margin: 8px 0 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 13px;
  line-height: 1.8;
  color: rgba(16, 24, 22, .76);
  transition: max-height 220ms var(--ease), opacity 220ms var(--ease), margin-top 220ms var(--ease);
}

.page-about .about-mile:hover .about-mile-note,
.page-about .about-mile:focus .about-mile-note,
.page-about .about-mile:focus-within .about-mile-note {
  max-height: 160px;
  opacity: 1;
}

/* 理念 */
.page-about .about-promises {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-promise {
  padding: 18px;
  background: var(--paper-deep);
  border: var(--line-light);
  border-top: 3px solid var(--cyan);
  border-radius: var(--radius);
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease);
}

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

.page-about .about-promise:nth-child(3) {
  border-top-color: var(--rust);
}

.page-about .about-promise:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.page-about .about-promise h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: .01em;
  color: var(--ink);
}

.page-about .about-promise p {
  margin: 0;
  font-size: 13px;
  line-height: 1.85;
  color: rgba(16, 24, 22, .78);
}

.page-about .about-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 26px;
  padding: 20px;
  background: var(--panel);
  border-radius: var(--radius);
  border: 1px solid rgba(88, 242, 206, .22);
}

.page-about .about-cta-label {
  margin: 0 0 8px;
  color: var(--cyan);
  letter-spacing: .2em;
}

.page-about .about-cta-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(243, 235, 221, .84);
}

.page-about .about-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-content: start;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero {
    padding: 36px 0 56px;
  }

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

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

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

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

  .page-about .about-promise:first-child {
    grid-column: 1 / -1;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 24px;
  }

  .page-about .about-cta-links {
    justify-content: flex-end;
    max-width: 320px;
  }
}

@media (min-width: 901px) {
  .page-about .about-hero {
    padding: 48px 0 64px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
  }

  .page-about .about-lead {
    font-size: 16px;
  }

  .page-about .about-body {
    padding: 56px 0 72px;
  }

  .page-about .about-body-grid {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
    border-bottom: 0;
  }

  .page-about .about-rail-list {
    flex-direction: column;
    gap: 0;
    padding: 0 0 0 18px;
    overflow: visible;
  }

  .page-about .about-rail-list::before {
    content: "";
    position: absolute;
    left: 3px;
    top: 8px;
    bottom: 8px;
    width: 1px;
    background: rgba(10, 36, 31, .2);
  }

  .page-about .about-rail-item {
    position: relative;
  }

  .page-about .about-rail-item::before {
    content: "";
    position: absolute;
    left: -19px;
    top: 17px;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--paper);
    border: 1px solid rgba(10, 36, 31, .4);
    transition: background 180ms var(--ease), border-color 180ms var(--ease);
  }

  .page-about .about-rail-item:hover::before,
  .page-about .about-rail-item:focus-within::before {
    background: var(--orange);
    border-color: var(--rust);
  }

  .page-about .about-rail-link {
    padding: 10px 0;
    border: 0;
    background: transparent;
    border-radius: 0;
    font-size: 14px;
  }

  .page-about .about-rail-link:hover,
  .page-about .about-rail-link:focus-visible {
    background: transparent;
    border-color: transparent;
  }

  .page-about .about-chapter {
    padding: 40px 0 44px;
  }

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

  .page-about .about-team-note {
    max-height: 0;
  }

  .page-about .about-verify-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 4fr);
    align-items: stretch;
    gap: 24px;
  }

  .page-about .about-miles {
    padding-left: 26px;
  }

  .page-about .about-mile {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 16px;
    padding: 16px 0 18px 16px;
  }

  .page-about .about-mile::before {
    left: -30px;
    top: 24px;
  }

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

  .page-about .about-promise:first-child {
    grid-column: auto;
  }

  .page-about .prose {
    font-size: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team-item,
  .page-about .about-promise,
  .page-about .about-team-note,
  .page-about .about-mile-note,
  .page-about .about-mile::before {
    transition: none;
  }

  .page-about .about-team-item:hover,
  .page-about .about-promise:hover {
    transform: none;
  }
}