.page-about {
  --about-orange: #FF6B35;
  --about-accent: #39FF88;
  --about-panel: #111827;
  --about-bg: #0A0E17;
  --about-border: rgba(255,255,255,0.08);
  --about-gray: #94A3B8;
  --about-white: #F8FAFC;
  background: var(--about-bg);
  color: var(--about-white);
  overflow-x: hidden;
}

.page-about .container {
  width: min(var(--container-w), 92%);
  margin-inline: auto;
  position: relative;
  z-index: 1;
}

/* 首屏 */
.about-hero {
  position: relative;
  padding: clamp(88px, 10vw, 140px) 0 60px;
  background:
    radial-gradient(circle at 78% 20%, rgba(57, 255, 136, 0.12) 0%, transparent 32%),
    radial-gradient(circle at 15% 85%, rgba(255, 107, 53, 0.08) 0%, transparent 28%),
    linear-gradient(120deg, #0F172A 0%, #0A0E17 55%, #111827 100%);
}

.about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(30,41,59,0.35) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30,41,59,0.35) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, #000 20%, transparent 80%);
  mask-image: linear-gradient(to bottom, transparent 0%, #000 20%, transparent 80%);
  pointer-events: none;
}

.about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}

.about-hero__copy {
  position: relative;
  z-index: 2;
}

.about-hero .breadcrumb {
  margin-bottom: 24px;
}

.about-hero .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.about-hero .breadcrumb__item {
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.4px;
  color: var(--about-gray);
}

.about-hero .breadcrumb__item::after {
  content: "/";
  margin-left: 8px;
  color: rgba(255,255,255,0.3);
}

.about-hero .breadcrumb__item:last-child::after {
  content: none;
}

.about-hero .breadcrumb__link {
  color: var(--about-gray);
  text-decoration: none;
  transition: color 0.3s var(--ease);
}

.about-hero .breadcrumb__link:hover {
  color: var(--about-accent);
}

.about-hero .breadcrumb__current {
  color: var(--about-white);
  font-weight: 600;
}

.hero-kicker {
  display: inline-block;
  font-family: var(--font-headline);
  font-size: 15px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--about-accent);
  border-left: 3px solid var(--about-accent);
  padding-left: 12px;
  margin-bottom: 18px;
}

.page-about .about-hero h1 {
  font-family: var(--font-headline);
  font-size: clamp(40px, 6vw, 72px);
  line-height: 1.02;
  letter-spacing: 0.5px;
  margin: 0 0 20px;
  max-width: 900px;
  text-transform: uppercase;
}

.about-hero__lead {
  font-family: var(--font-body);
  font-size: clamp(14px, 1.4vw, 17px);
  line-height: 1.8;
  color: var(--about-gray);
  max-width: 620px;
  margin: 0 0 32px;
}

.about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.about-hero .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.8px;
  padding: 14px 28px;
  text-decoration: none;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), background 0.3s var(--ease);
}

.about-hero .btn--primary {
  background: var(--about-accent);
  color: #0A0E17;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}

.about-hero .btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(57,255,136,0.25);
}

.about-hero .btn--ghost {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.2);
  color: var(--about-white);
}

.about-hero .btn--ghost:hover {
  border-color: var(--about-accent);
  color: var(--about-accent);
}

.about-hero__visual {
  position: relative;
}

.hero-visual__img {
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 6%, 100% 94%, 6% 100%, 0 88%);
  filter: saturate(1.1) contrast(1.05);
}

.hero-watermark {
  position: absolute;
  right: -8%;
  top: -12%;
  font-family: var(--font-headline);
  font-size: clamp(140px, 20vw, 280px);
  line-height: 1;
  font-weight: 900;
  color: rgba(57,255,136,0.08);
  pointer-events: none;
  z-index: 0;
  user-select: none;
}

/* 品牌起源 */
.page-about .about-origin {
  padding: clamp(60px, 7vw, 96px) 0;
  position: relative;
}

.page-about .about-origin::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(to right, transparent, rgba(255,255,255,0.08) 30%, rgba(57,255,136,0.4) 70%, transparent);
}

.page-about .about-origin .section-title,
.page-about .about-timeline .section-title,
.page-about .about-data .section-title,
.page-about .about-team .section-title {
  margin-bottom: 40px;
}

.page-about .section-title__label {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--about-accent);
  margin-bottom: 10px;
  padding: 5px 12px;
  background: rgba(57,255,136,0.08);
  border: 1px solid rgba(57,255,136,0.25);
}

.page-about .section-title__main {
  font-family: var(--font-headline);
  font-size: clamp(30px, 4.5vw, 52px);
  line-height: 1.1;
  letter-spacing: 0.5px;
  margin: 0 0 12px;
  text-transform: uppercase;
}

.page-about .section-title__desc {
  font-family: var(--font-body);
  font-size: clamp(14px, 1.3vw, 16px);
  line-height: 1.7;
  color: var(--about-gray);
  max-width: 720px;
}

.page-about .section-title--center {
  text-align: center;
}

.page-about .section-title--center .section-title__desc {
  margin-inline: auto;
}

.about-origin__wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: start;
}

.about-origin__text {
  font-family: var(--font-body);
  line-height: 1.85;
  color: var(--about-gray);
  font-size: 15px;
}

.about-origin__text p {
  margin: 0 0 16px;
}

.about-origin__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .stat {
  background: var(--about-panel);
  border: 1px solid var(--about-border);
  border-left: 3px solid var(--about-accent);
  padding: 24px;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .stat:hover {
  border-color: rgba(57,255,136,0.4);
  transform: translateY(-2px);
}

.page-about .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  color: var(--about-white);
  line-height: 1.2;
}

.page-about .stat__label {
  display: block;
  margin-top: 8px;
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--about-gray);
  letter-spacing: 0.5px;
}

/* 版本时间轴 */
.page-about .about-timeline {
  padding: clamp(60px, 7vw, 96px) 0;
  background: rgba(17,24,39,0.5);
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(30,41,59,0.2) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
}

.timeline-wrap {
  position: relative;
  padding: 20px 0;
}

.timeline-line {
  position: absolute;
  top: 40px;
  left: 0;
  width: 100%;
  height: calc(100% - 80px);
  pointer-events: none;
  display: none;
}

.timeline-line__base {
  fill: none;
  stroke: var(--about-grid, #1E293B);
  stroke-width: 2;
  stroke-dasharray: 8 4;
}

.timeline-line__glow {
  fill: none;
  stroke: var(--about-accent);
  stroke-width: 3;
  stroke-dasharray: 8 4;
  filter: drop-shadow(0 0 6px rgba(57,255,136,0.6));
  opacity: 0.6;
}

.timeline-card {
  position: relative;
  margin-bottom: 44px;
}

.timeline-card__node {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-headline);
  font-size: 20px;
  font-weight: 700;
  color: var(--about-accent);
  background: var(--about-panel);
  border: 2px solid var(--about-accent);
  box-shadow: 0 0 20px rgba(57,255,136,0.2);
  padding: 8px 16px;
  margin-bottom: 14px;
}

.timeline-card__inner {
  background:
    linear-gradient(135deg, transparent 15px, var(--about-panel) 15px),
    var(--about-panel);
  border: 1px solid var(--about-border);
  border-left: 3px solid var(--about-accent);
  padding: 24px;
  position: relative;
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease), transform 0.3s var(--ease);
}

.timeline-card__inner:hover {
  border-color: rgba(57,255,136,0.5);
  box-shadow: 0 6px 30px rgba(57,255,136,0.08);
  transform: translateY(-3px);
}

.timeline-card--current .timeline-card__inner {
  border-left-color: var(--about-orange);
  background:
    linear-gradient(135deg, transparent 15px, #172033 15px),
    #172033;
}

.timeline-card--current .timeline-card__node {
  color: var(--about-orange);
  border-color: var(--about-orange);
  box-shadow: 0 0 20px rgba(255,107,53,0.3);
}

.page-about .timeline-card h3 {
  font-family: var(--font-headline);
  font-size: 24px;
  letter-spacing: 0.5px;
  margin: 0 0 10px;
  color: var(--about-white);
  text-transform: uppercase;
}

.page-about .timeline-card p {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-gray);
  margin: 8px 0 0;
}

.page-about .tag {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
  padding: 4px 10px;
  margin-bottom: 10px;
  text-transform: uppercase;
}

.page-about .tag--accent {
  background: rgba(57,255,136,0.1);
  color: var(--about-accent);
  border: 1px solid rgba(57,255,136,0.3);
}

.page-about .tag--orange {
  background: rgba(255,107,53,0.1);
  color: var(--about-orange);
  border: 1px solid rgba(255,107,53,0.3);
}

.timeline-media {
  margin: 40px 0;
  position: relative;
}

.timeline-media img {
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
  filter: grayscale(0.3) contrast(1.05);
}

/* 核心能力 */
.page-about .about-capability {
  padding: clamp(60px, 7vw, 96px) 0;
  position: relative;
}

.page-about .about-capability::before {
  content: "V4";
  position: absolute;
  right: -4%;
  top: 8%;
  font-family: var(--font-headline);
  font-size: clamp(200px, 30vw, 480px);
  line-height: 1;
  color: rgba(57,255,136,0.03);
  pointer-events: none;
  user-select: none;
  z-index: 0;
}

.capability-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 48px;
  position: relative;
  z-index: 1;
}

.capability-card {
  background: rgba(17,24,39,0.8);
  border: 1px solid var(--about-border);
  padding: 32px 28px;
  position: relative;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.capability-card:hover {
  border-color: rgba(57,255,136,0.4);
  transform: translateY(-4px);
}

.capability-card__num {
  display: block;
  font-family: var(--font-headline);
  font-size: 60px;
  font-weight: 900;
  line-height: 1;
  color: rgba(57,255,136,0.15);
  margin-bottom: 18px;
}

.capability-card h3 {
  font-family: var(--font-headline);
  font-size: 26px;
  letter-spacing: 0.4px;
  color: var(--about-white);
  margin: 0 0 12px;
  text-transform: uppercase;
}

.capability-card p {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-gray);
  margin: 0;
}

/* 数据可靠性 */
.page-about .about-data {
  padding: clamp(60px, 7vw, 96px) 0;
  background: linear-gradient(120deg, #0F172A 0%, #0A0E17 70%);
}

.about-data__panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  background: var(--about-panel);
  border: 1px solid var(--about-border);
  padding: clamp(28px, 4vw, 48px);
  position: relative;
  overflow: hidden;
}

.about-data__panel::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 160px;
  height: 160px;
  background: radial-gradient(circle, rgba(255,107,53,0.2) 0%, transparent 70%);
}

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

.about-data__copy p {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-gray);
  margin: 16px 0 24px;
}

.data-points {
  list-style: none;
  padding: 0;
  margin: 0;
}

.data-points li {
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--about-gray);
  padding: 8px 0 8px 24px;
  position: relative;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.data-points li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 16px;
  width: 8px;
  height: 8px;
  background: var(--about-accent);
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
}

.about-data__cert {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: 24px;
  background: rgba(255,107,53,0.06);
  border: 1px solid rgba(255,107,53,0.2);
  position: relative;
  z-index: 1;
}

.cert-badge {
  font-family: var(--font-headline);
  font-size: 28px;
  font-weight: 700;
  color: var(--about-orange);
  letter-spacing: 2px;
}

.cert-note {
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--about-gray);
  margin: 8px 0 0;
}

/* 团队 */
.page-about .about-team {
  padding: clamp(60px, 7vw, 96px) 0;
}

.about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

.about-team__text p {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-gray);
  margin: 0 0 16px;
}

.about-team__media img {
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: grayscale(0.4) contrast(1.08);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 24px 100%);
}

.about-team__note {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 20px;
  margin-top: 48px;
  padding: 28px;
  background: var(--about-panel);
  border: 1px solid var(--about-border);
  border-left: 3px solid var(--about-orange);
}

.about-team__note p {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-gray);
  margin: 0;
}

.about-team__note .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.8px;
  padding: 12px 24px;
  background: var(--about-orange);
  color: #0A0E17;
  text-decoration: none;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.about-team__note .btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255,107,53,0.25);
}

@media (min-width: 720px) {
  .about-hero__grid {
    grid-template-columns: 1.15fr 0.85fr;
  }

  .about-origin__wrap {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
  }

  .about-origin__stats {
    grid-template-columns: 1fr;
  }

  .about-data__panel {
    grid-template-columns: 1.4fr 0.6fr;
  }

  .about-team__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .capability-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .timeline-line {
    display: block;
  }

  .timeline-wrap {
    padding: 20px 40px;
  }

  .timeline-card {
    width: 46%;
    margin-bottom: 0;
  }

  .timeline-card--left {
    margin-right: auto;
    margin-left: 0;
    margin-bottom: 80px;
  }

  .timeline-card--right {
    margin-left: auto;
    margin-right: 0;
    margin-bottom: 80px;
  }

  .timeline-card--right .timeline-card__inner {
    border-left: none;
    border-right: 3px solid var(--about-accent);
    background:
      linear-gradient(225deg, transparent 15px, var(--about-panel) 15px),
      var(--about-panel);
  }

  .timeline-card--right.timeline-card--current .timeline-card__inner {
    border-right-color: var(--about-orange);
    background:
      linear-gradient(225deg, transparent 15px, #172033 15px),
      #172033;
  }

  .timeline-card--right .timeline-card__node {
    text-align: right;
  }

  .timeline-media {
    width: 46%;
    margin: 0 auto 80px;
  }

  .timeline-card:last-child {
    margin-bottom: 0;
  }
}

.page-about {
  --about-grid: var(--about-border);
}