.page-about {
  color: var(--ll-text);
  background: var(--ll-white);
  font-family: var(--ll-font-body);
  line-height: 1.7;
  overflow-x: hidden;
}

/* Hero */
.page-about .about-hero {
  position: relative;
  background: var(--ll-deep-blue);
  color: var(--ll-white);
  padding: 40px 0 72px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,.07) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -100px;
  top: -100px;
  width: 360px;
  height: 360px;
  background: radial-gradient(circle, rgba(255,106,0,.35), transparent 65%);
  pointer-events: none;
}

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

.page-about .about-hero .breadcrumbs {
  color: rgba(255,255,255,.6);
  margin-bottom: 48px;
}

.page-about .about-hero .breadcrumbs a {
  color: rgba(255,255,255,.85);
  text-decoration: none;
}

.page-about .about-hero .breadcrumbs a:hover {
  color: var(--ll-light-orange);
}

.page-about .about-hero-inner {
  position: relative;
  display: grid;
  gap: 44px;
}

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

.page-about .about-chapter-num {
  display: block;
  font-family: var(--ll-font-data);
  font-weight: 700;
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1;
  color: var(--ll-orange);
  margin-bottom: 12px;
}

.page-about .about-eyebrow {
  font-family: var(--ll-font-data);
  font-size: .86rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ll-light-orange);
  margin: 0 0 16px;
}

.page-about .about-hero h1 {
  font-family: var(--ll-font-head);
  font-size: clamp(2.5rem, 7vw, 4.8rem);
  line-height: 1.08;
  margin: 0 0 22px;
  letter-spacing: -.02em;
}

.page-about .about-hero-accent {
  color: var(--ll-orange);
}

.page-about .about-hero-desc {
  font-size: 1.08rem;
  color: rgba(255,255,255,.78);
  max-width: 480px;
  margin: 0 0 32px;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-hero .btn--ghost {
  background: transparent;
  border: 1px solid rgba(255,255,255,.5);
  color: var(--ll-white);
}

.page-about .about-hero .btn--ghost:hover {
  border-color: var(--ll-light-orange);
  color: var(--ll-light-orange);
  background: rgba(255,255,255,.08);
}

.page-about .about-hero-stamp {
  display: none;
}

.page-about .about-hero-svg {
  width: min(100%, 380px);
  height: auto;
  opacity: .9;
}

/* 章节通用 */
.page-about .about-section {
  padding: 72px 0;
  position: relative;
}

.page-about .about-section-head {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 40px;
  padding-bottom: 20px;
  border-bottom: 1px dashed var(--ll-line);
}

.page-about .about-section-head .about-chapter-num {
  margin-bottom: 0;
  flex-shrink: 0;
}

.page-about .about-section-head h2 {
  font-family: var(--ll-font-head);
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  line-height: 1.2;
  margin: 4px 0 0;
  padding-right: 52px;
  color: var(--ll-deep-blue);
}

.page-about .about-rotate-note {
  position: absolute;
  right: 0;
  top: 0;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font-family: var(--ll-font-data);
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ll-muted);
}

/* 品牌使命 */
.page-about .about-mission {
  background: var(--ll-bg-light);
}

.page-about .about-mission-grid {
  display: grid;
  gap: 28px;
}

.page-about .about-mission-text p {
  font-size: 1.05rem;
  margin: 0 0 22px;
  color: var(--ll-text);
}

.page-about .about-mission-text ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-mission-text li {
  position: relative;
  padding-left: 28px;
  color: var(--ll-muted);
  font-size: .95rem;
}

.page-about .about-mission-text li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 14px;
  height: 2px;
  background: var(--ll-orange);
}

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

.page-about .about-mission-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--ll-radius);
  box-shadow: var(--ll-shadow);
}

/* 发展历程 */
.page-about .about-timeline {
  background: var(--ll-white);
}

.page-about .about-timeline-figure {
  margin: 0 0 40px;
  border-radius: var(--ll-radius);
  overflow: hidden;
  border: 1px solid var(--ll-line);
}

.page-about .about-timeline-figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-timeline-axis {
  margin: -16px 0 12px;
}

.page-about .about-timeline-rule {
  display: block;
  width: 100%;
  max-width: 480px;
  height: auto;
}

.page-about .about-timeline-rule line,
.page-about .about-timeline-rule path {
  stroke: var(--ll-line);
  stroke-width: 1;
}

.page-about .about-timeline-rule circle {
  fill: var(--ll-orange);
  stroke: var(--ll-orange);
  stroke-width: 1;
}

.page-about .about-timeline-list {
  position: relative;
  margin: 0;
}

.page-about .about-timeline-list::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: repeating-linear-gradient(to bottom, var(--ll-orange) 0 6px, transparent 6px 12px);
  opacity: .4;
}

.page-about .about-timeline-item {
  position: relative;
  padding: 20px 0 20px 44px;
  border-bottom: 1px dashed var(--ll-line);
}

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

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 34px;
  width: 16px;
  height: 16px;
  border: 3px solid var(--ll-orange);
  border-radius: 50%;
  background: var(--ll-white);
  box-shadow: 0 0 0 4px rgba(255,106,0,.12);
}

.page-about .about-timeline-item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .about-timeline-item summary::-webkit-details-marker {
  display: none;
}

.page-about .about-timeline-item summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--ll-font-data);
  font-size: 1.4rem;
  line-height: 1;
  color: var(--ll-orange);
  transition: transform .3s ease;
}

.page-about .about-timeline-item[open] summary::after {
  transform: rotate(45deg);
}

.page-about .about-timeline-year {
  font-family: var(--ll-font-head);
  font-size: 1.25rem;
  line-height: 1;
  color: var(--ll-orange);
  flex-shrink: 0;
}

.page-about .about-timeline-tag {
  font-family: var(--ll-font-body);
  font-size: .78rem;
  color: var(--ll-muted);
  border: 1px solid var(--ll-line);
  padding: 3px 10px;
  border-radius: 100px;
  white-space: nowrap;
}

.page-about .about-timeline-body {
  padding: 14px 0 4px;
  color: var(--ll-muted);
  font-size: .95rem;
  max-width: 620px;
  animation: aboutFadeIn .3s ease;
}

.page-about .about-timeline-body p {
  margin: 0;
}

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

@keyframes aboutFadeIn {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 平台数据 */
.page-about .about-stats {
  background-color: var(--ll-deep-blue);
  background-image:
    linear-gradient(to right, rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size: 40px 40px;
  color: var(--ll-white);
}

.page-about .about-stats .about-section-head {
  border-bottom-color: rgba(255,255,255,.18);
}

.page-about .about-stats .about-section-head h2 {
  color: var(--ll-white);
}

.page-about .about-stats .about-rotate-note {
  color: rgba(255,255,255,.5);
}

.page-about .about-stats-grid {
  display: grid;
  gap: 36px;
}

.page-about .about-stats-cards {
  display: grid;
  gap: 18px;
}

.page-about .about-stat-card {
  position: relative;
  padding: 26px 24px;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: var(--ll-radius);
  background: rgba(255,255,255,.06);
  transition: background .3s ease;
}

.page-about .about-stat-card:hover {
  background: rgba(255,255,255,.1);
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--ll-font-data);
  font-size: clamp(2.8rem, 8vw, 4rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ll-orange);
}

.page-about .about-stat-num span {
  font-size: .5em;
  vertical-align: super;
  margin-left: 2px;
  color: var(--ll-light-orange);
}

.page-about .about-stat-label {
  display: block;
  margin: 14px 0 8px;
  font-family: var(--ll-font-head);
  font-size: 1.05rem;
  color: var(--ll-white);
}

.page-about .about-stat-card p {
  color: rgba(255,255,255,.72);
  font-size: .92rem;
  margin: 0;
}

.page-about .about-stats-figure {
  margin: 0;
  align-self: center;
}

.page-about .about-stats-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--ll-radius);
  border: 1px solid rgba(255,255,255,.2);
  box-shadow: 0 20px 50px rgba(0,0,0,.25);
}

/* 合作生态 */
.page-about .about-ecosystem {
  background: var(--ll-bg-light);
}

.page-about .about-eco-grid {
  display: grid;
  gap: 18px;
}

.page-about .about-eco-card {
  padding: 30px 26px;
  background: var(--ll-white);
  border: 1px solid var(--ll-line);
  border-radius: var(--ll-radius);
  box-shadow: var(--ll-shadow);
}

.page-about .about-eco-card h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--ll-font-head);
  font-size: 1.15rem;
  color: var(--ll-deep-blue);
}

.page-about .about-eco-card h3::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ll-orange);
  flex-shrink: 0;
}

.page-about .about-eco-card p {
  margin: 0 0 14px;
  color: var(--ll-muted);
  font-size: .94rem;
}

.page-about .about-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--ll-orange);
  font-size: .9rem;
  font-weight: 600;
  text-decoration: none;
}

.page-about .about-card-link::after {
  content: "→";
  transition: transform .3s ease;
}

.page-about .about-card-link:hover::after {
  transform: translateX(4px);
}

/* 荣誉与认可 */
.page-about .about-honors {
  background: var(--ll-white);
}

.page-about .about-honors-grid {
  display: grid;
  gap: 20px;
  margin-bottom: 48px;
}

.page-about .about-honor-card {
  position: relative;
  padding: 34px 28px;
  border: 1px dashed var(--ll-line);
  border-radius: var(--ll-radius);
  background: linear-gradient(135deg, rgba(255,106,0,.06), transparent 55%);
  overflow: hidden;
}

.page-about .about-honor-card::after {
  content: "";
  position: absolute;
  right: -24px;
  top: -24px;
  width: 72px;
  height: 72px;
  border: 1px solid var(--ll-orange);
  border-radius: 50%;
  opacity: .16;
}

.page-about .about-honor-year {
  display: block;
  font-family: var(--ll-font-data);
  font-size: .85rem;
  letter-spacing: .14em;
  color: var(--ll-orange);
  margin-bottom: 12px;
}

.page-about .about-honor-card h3 {
  font-family: var(--ll-font-head);
  font-size: 1.22rem;
  color: var(--ll-deep-blue);
  margin: 0 0 10px;
}

.page-about .about-honor-card p {
  color: var(--ll-muted);
  font-size: .94rem;
  margin: 0;
}

/* 信任声明 */
.page-about .about-trust {
  display: grid;
  gap: 20px;
  padding: 36px 28px;
  background: var(--ll-bg-light);
  border: 1px solid var(--ll-line);
  border-radius: var(--ll-radius);
  text-align: center;
}

.page-about .about-trust p {
  margin: 0;
  color: var(--ll-muted);
  font-size: .95rem;
}

.page-about .about-trust-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

/* 桌面端 */
@media (min-width: 768px) {
  .page-about .about-section {
    padding: 88px 0;
  }

  .page-about .about-hero {
    padding: 56px 0 88px;
  }

  .page-about .about-hero-inner {
    grid-template-columns: 1.15fr .85fr;
    align-items: center;
    gap: 48px;
    min-height: 420px;
  }

  .page-about .about-hero-stamp {
    display: flex;
    justify-content: center;
    align-items: center;
  }

  .page-about .about-mission-grid {
    grid-template-columns: 1.15fr .85fr;
    align-items: center;
    gap: 56px;
  }

  .page-about .about-timeline-list::before {
    left: 24px;
  }

  .page-about .about-timeline-item {
    padding-left: 84px;
  }

  .page-about .about-timeline-item::before {
    left: 17px;
  }

  .page-about .about-stats-grid {
    grid-template-columns: 1.1fr .9fr;
    align-items: center;
    gap: 56px;
  }

  .page-about .about-eco-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
  }

  .page-about .about-honors-grid {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }

  .page-about .about-trust {
    grid-template-columns: 1fr auto;
    align-items: center;
    text-align: left;
    padding: 40px 36px;
  }

  .page-about .about-trust-links {
    justify-content: flex-end;
  }
}