.page-about {
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

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

/* ============ 首屏 ============ */
.page-about .about-hero {
  padding: clamp(18px, 3vw, 34px) 0 clamp(30px, 5vw, 56px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

@media (min-width: 980px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    gap: 28px;
    align-items: stretch;
  }
}

.page-about .about-hero__panel {
  position: relative;
  background: var(--deep);
  color: var(--cream);
  padding: clamp(24px, 3.6vw, 50px) clamp(20px, 3.2vw, 48px) clamp(52px, 6vw, 82px);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - 38px));
  overflow: hidden;
}

.page-about .about-hero__panel::after {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -80px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: var(--orange);
  opacity: 0.24;
  pointer-events: none;
}

.page-about .about-hero__panel .crumb {
  color: rgba(253, 246, 236, 0.62);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  position: relative;
  z-index: 1;
}

.page-about .about-hero__panel .crumb a {
  color: var(--cream);
  text-decoration: none;
}

.page-about .about-hero__panel .crumb a:hover,
.page-about .about-hero__panel .crumb a:focus-visible {
  color: var(--orange);
}

.page-about .about-hero__kicker {
  margin: 22px 0 0;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--amber);
  position: relative;
  z-index: 1;
}

.page-about .about-hero__panel h1 {
  margin: 14px 0 16px;
  font-size: clamp(27px, 5vw, 50px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
  position: relative;
  z-index: 1;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: rgba(253, 246, 236, 0.86);
  position: relative;
  z-index: 1;
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 36px;
  margin: 28px 0 0;
  padding-top: 20px;
  border-top: 1px dashed rgba(253, 246, 236, 0.28);
  position: relative;
  z-index: 1;
}

.page-about .about-stat dt {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: rgba(253, 246, 236, 0.6);
}

.page-about .about-stat dd {
  margin: 5px 0 0;
  font-size: clamp(19px, 2.2vw, 24px);
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  color: var(--cream);
}

.page-about .about-hero__figure {
  margin: 0;
  min-height: 180px;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 10px;
}

/* ============ 长卷时间轴 ============ */
.page-about .about-story {
  padding: clamp(30px, 5vw, 64px) 0 clamp(36px, 5vw, 72px);
}

.page-about .story-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

@media (min-width: 1080px) {
  .page-about .story-grid {
    grid-template-columns: 170px 1fr;
    gap: 48px;
  }
}

/* 左侧章节索引 */
.page-about .tl-nav {
  display: none;
}

@media (min-width: 1080px) {
  .page-about .tl-nav {
    display: block;
    position: sticky;
    top: 96px;
    align-self: start;
    padding-top: 4px;
  }
}

.page-about .tl-nav__cap {
  margin: 0 0 14px;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--ink-mute);
}

.page-about .tl-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .tl-nav__list a {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 8px 10px;
  border-left: 2px solid var(--line);
  font-size: 13.5px;
  line-height: 1.4;
  color: var(--ink-soft);
  text-decoration: none;
  transition: color 0.16s ease, border-color 0.16s ease, background-color 0.16s ease;
}

.page-about .tl-nav__list a span {
  font-size: 10.5px;
  letter-spacing: 0.08em;
  font-variant-numeric: tabular-nums;
  color: var(--ink-mute);
}

.page-about .tl-nav__list a:hover,
.page-about .tl-nav__list a:focus-visible {
  color: var(--deep);
  border-left-color: var(--orange);
  background: var(--white);
}

/* 时间线主体 */
.page-about .tl-items {
  position: relative;
}

.page-about .tl-items::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--orange) 0%, var(--amber) 55%, var(--line) 100%);
}

.page-about .tl-item {
  position: relative;
  padding-left: 48px;
  padding-bottom: clamp(30px, 4.4vw, 54px);
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 12px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px var(--cream), 0 0 0 6px var(--orange-soft);
  z-index: 2;
}

@media (min-width: 900px) {
  .page-about .tl-item:nth-child(even) {
    padding-left: 92px;
  }
  .page-about .tl-item:nth-child(even)::before {
    left: 11px;
  }
}

.page-about .tl-body {
  position: relative;
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  padding: clamp(20px, 2.4vw, 30px);
}

.page-about .tl-item:nth-child(even) .tl-body {
  background: var(--moss);
  border-color: transparent;
}

.page-about .tl-watermark {
  position: absolute;
  right: 12px;
  bottom: 2px;
  font-size: clamp(52px, 8vw, 104px);
  font-weight: 900;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--deep);
  opacity: 0.055;
  pointer-events: none;
  user-select: none;
}

.page-about .tl-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--ink-mute);
  position: relative;
  z-index: 1;
}

.page-about .tl-idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 30px;
  height: 23px;
  padding: 0 7px;
  border-radius: 3px;
  background: var(--ink);
  color: var(--cream);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  transition: background-color 0.25s ease, color 0.25s ease;
}

.page-about .tl-item.is-inview .tl-idx {
  background: var(--orange);
  color: var(--deep);
}

.page-about .tl-title {
  margin: 0 0 14px;
  font-size: clamp(20px, 2.5vw, 31px);
  font-weight: 900;
  line-height: 1.22;
  color: var(--deep);
  position: relative;
  z-index: 1;
}

.page-about .tl-body p {
  margin: 0 0 13px;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
  position: relative;
  z-index: 1;
}

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

.page-about .tl-facts {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
  position: relative;
  z-index: 1;
}

.page-about .tl-facts li {
  padding: 10px 14px;
  border-left: 3px solid var(--orange);
  background: var(--cream);
  border-radius: 0 8px 8px 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .tl-facts strong {
  display: block;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--deep);
  margin-bottom: 2px;
}

/* 六个节点 */
.page-about .milestones {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
  position: relative;
  z-index: 1;
}

.page-about .milestone {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 12px;
  padding: 12px 14px;
  background: var(--cream);
  border-radius: 10px;
  border-left: 3px solid var(--amber);
}

.page-about .ms-no {
  font-size: 17px;
  font-weight: 900;
  line-height: 1.35;
  font-variant-numeric: tabular-nums;
  color: var(--orange);
}

.page-about .ms-body h3 {
  margin: 0 0 3px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--deep);
}

.page-about .ms-body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink-mute);
  max-width: none;
}

/* 品控 */
.page-about .about-quality__figure {
  margin: 18px 0 18px;
  position: relative;
  z-index: 1;
}

.page-about .trace-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 11px;
  margin-top: 4px;
  position: relative;
  z-index: 1;
}

@media (min-width: 640px) {
  .page-about .trace-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.page-about .trace-card {
  padding: 14px 16px;
  border: 1px dashed var(--line);
  border-radius: 10px;
  background: var(--cream);
}

.page-about .trace-card h3 {
  margin: 0 0 6px;
  font-size: 14px;
  font-weight: 700;
  color: var(--deep);
  letter-spacing: 0.02em;
}

.page-about .trace-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-mute);
  max-width: none;
}

/* 团队 */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 16px 0 18px;
  position: relative;
  z-index: 1;
}

@media (min-width: 660px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.page-about .team-card {
  padding: 18px 16px 16px;
  background: var(--cream);
  border-radius: 10px;
  border-top: 3px solid var(--orange);
}

.page-about .team-num {
  display: inline-block;
  font-size: clamp(28px, 3.6vw, 38px);
  font-weight: 900;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--deep);
}

.page-about .team-card h3 {
  margin: 9px 0 6px;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--deep);
}

.page-about .team-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-mute);
  max-width: none;
}

.page-about .team-note {
  margin: 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-size: 14px;
  color: var(--ink-mute);
}

/* 资质 */
.page-about .certs-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 16px;
  position: relative;
  z-index: 1;
}

@media (min-width: 780px) {
  .page-about .certs-layout {
    grid-template-columns: 230px 1fr;
    align-items: start;
    gap: 24px;
  }
}

.page-about .certs-figure {
  margin: 0;
}

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

.page-about .badge {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 13px;
  align-items: center;
  padding: 12px 14px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 10px;
  transition: border-color 0.16s ease, box-shadow 0.16s ease, transform 0.16s ease;
}

.page-about .badge:hover {
  border-color: var(--blue);
  box-shadow: var(--shadow-soft);
  transform: translateY(-2px);
}

.page-about .badge-ring {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 2px solid var(--orange);
  display: grid;
  place-items: center;
  font-size: 12.5px;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  color: var(--orange);
}

.page-about .badge h3 {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 700;
  color: var(--deep);
}

.page-about .badge p {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-mute);
  max-width: none;
}

/* 合作 */
.page-about .partner-stats {
  list-style: none;
  margin: 18px 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  position: relative;
  z-index: 1;
}

@media (min-width: 580px) {
  .page-about .partner-stats {
    grid-template-columns: repeat(3, 1fr);
  }
}

.page-about .partner-stats li {
  padding: 16px 14px;
  background: var(--deep);
  color: var(--cream);
  border-radius: 10px;
  text-align: center;
}

.page-about .ps-num {
  display: block;
  font-size: clamp(24px, 3.2vw, 32px);
  font-weight: 900;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.page-about .ps-lbl {
  display: block;
  margin-top: 7px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(253, 246, 236, 0.72);
}

/* ============ 收束区 ============ */
.page-about .about-close {
  position: relative;
  overflow: hidden;
  margin-top: clamp(36px, 5vw, 74px);
  padding: clamp(40px, 5.6vw, 82px) 0 clamp(44px, 6vw, 88px);
  background: var(--deep);
  color: var(--cream);
}

.page-about .about-close::before {
  content: "";
  position: absolute;
  top: -90px;
  right: -90px;
  width: 340px;
  height: 340px;
  border-radius: 50%;
  background: radial-gradient(circle at 34% 34%, var(--orange), transparent 68%);
  opacity: 0.32;
  pointer-events: none;
}

.page-about .close-kicker {
  margin: 0 0 14px;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--amber);
  position: relative;
  z-index: 1;
}

.page-about .about-close h2 {
  margin: 0;
  font-size: clamp(23px, 3.6vw, 40px);
  font-weight: 900;
  line-height: 1.18;
  color: var(--cream);
  max-width: 22ch;
  position: relative;
  z-index: 1;
}

.page-about .close-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin: 30px 0 32px;
  position: relative;
  z-index: 1;
}

@media (min-width: 820px) {
  .page-about .close-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
  }
}

.page-about .close-card {
  padding-top: 16px;
  border-top: 2px solid var(--orange);
}

.page-about .close-card h3 {
  margin: 0 0 9px;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .close-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(253, 246, 236, 0.74);
}

.page-about .close-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  position: relative;
  z-index: 1;
}

.page-about .about-close .btn-ghost {
  color: var(--cream);
  border-color: rgba(253, 246, 236, 0.42);
}

.page-about .about-close .btn-ghost:hover,
.page-about .about-close .btn-ghost:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

.page-about .close-note {
  margin: 24px 0 0;
  max-width: 70ch;
  font-size: 13.5px;
  line-height: 1.85;
  color: rgba(253, 246, 236, 0.62);
  position: relative;
  z-index: 1;
}

.page-about .close-note a {
  color: var(--orange);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .close-note a:hover,
.page-about .close-note a:focus-visible {
  color: var(--amber);
}

/* ============ 动效降级 ============ */
@media (prefers-reduced-motion: reduce) {
  .page-about .tl-idx,
  .page-about .badge,
  .page-about .tl-nav__list a {
    transition: none;
  }
  .page-about .badge:hover {
    transform: none;
  }
}
</main>