.page-about {
  --about-gold: #FFD700;
  --about-red: #E63946;
  --about-dark: #0D1B2A;
  --about-card-bg: #1B2838;
  --about-neon: #39FF14;
  --about-blue: #00BFFF;
  --about-text: #FFFFFF;
  --about-text-secondary: #B0B0B0;
  --about-font-heading: 'Futura Bold', 'Impact', sans-serif;
  --about-font-body: 'Roboto', 'Helvetica Neue', sans-serif;
  --about-max-width: 1200px;
  --about-transition: 0.35s ease;
  display: block;
  background: var(--about-dark);
  color: var(--about-text);
  font-family: var(--about-font-body);
  overflow-x: hidden;
}

/* ===== HERO 首屏 ===== */
.about-hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.about-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

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

.about-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(13,27,42,0.85) 30%, rgba(13,27,42,0.4) 70%, rgba(230,57,70,0.25) 100%);
  z-index: 1;
}

.about-hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 2rem 1.5rem;
  max-width: 900px;
  margin: 0 auto;
}

.about-section-label {
  display: inline-block;
  font-family: var(--about-font-heading);
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  color: var(--about-gold);
  background: rgba(255,215,0,0.12);
  padding: 0.4rem 1.2rem;
  border-left: 3px solid var(--about-red);
  margin-bottom: 1.5rem;
  text-transform: uppercase;
}

.about-section-label--center {
  border-left: none;
  border-bottom: 3px solid var(--about-red);
  padding-bottom: 0.6rem;
  margin-bottom: 1.2rem;
}

.about-hero-title {
  font-family: var(--about-font-heading);
  font-size: 2.8rem;
  line-height: 1.1;
  margin: 0 0 1.2rem;
  color: var(--about-text);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.about-hero-accent {
  display: block;
  font-size: 1.1em;
  background: linear-gradient(135deg, var(--about-gold), var(--about-red));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.about-hero-sub {
  font-size: 1.1rem;
  color: var(--about-text-secondary);
  max-width: 600px;
  margin: 0 auto 2.5rem;
  line-height: 1.6;
  font-weight: 300;
}

.about-hero-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  opacity: 0.7;
}

.about-hero-line {
  display: block;
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--about-gold), transparent);
  animation: aboutPulseLine 2s ease-in-out infinite;
}

.about-hero-scrolltext {
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--about-text-secondary);
}

@keyframes aboutPulseLine {
  0%, 100% { opacity: 0.4; transform: scaleY(1); }
  50% { opacity: 1; transform: scaleY(1.15); }
}

/* ===== MISSION 品牌使命 ===== */
.about-mission {
  padding: 4rem 1.5rem 3rem;
  max-width: var(--about-max-width);
  margin: 0 auto;
}

.about-mission-inner {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  align-items: center;
}

.about-mission-visual {
  position: relative;
  width: 100%;
  max-width: 500px;
  flex-shrink: 0;
}

.about-mission-img {
  width: 100%;
  height: auto;
  aspect-ratio: 4/3;
  object-fit: cover;
  display: block;
  border-radius: 4px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.5);
}

.about-mission-shape {
  position: absolute;
  top: -12px;
  right: -12px;
  width: 60%;
  height: 60%;
  border: 2px solid var(--about-red);
  border-radius: 4px;
  z-index: -1;
  opacity: 0.3;
}

.about-mission-text {
  flex: 1;
}

.about-mission-title {
  font-family: var(--about-font-heading);
  font-size: 1.8rem;
  line-height: 1.2;
  margin: 0 0 1rem;
  color: var(--about-text);
}

.about-mission-desc {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--about-text-secondary);
  margin: 0 0 1rem;
}

.about-mission-desc strong {
  color: var(--about-gold);
  font-weight: 600;
}

.about-mission-stats {
  display: flex;
  gap: 1.5rem;
  margin-top: 1.8rem;
  flex-wrap: wrap;
}

.about-mission-stat {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.about-stat-num {
  font-family: var(--about-font-heading);
  font-size: 1.4rem;
  color: var(--about-red);
  letter-spacing: 0.05em;
}

.about-stat-label {
  font-size: 0.8rem;
  color: var(--about-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ===== JOURNEY 发展历程（时间轴） ===== */
.about-journey {
  padding: 3rem 1.5rem 4rem;
  background: rgba(27,40,56,0.4);
  position: relative;
}

.about-journey::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--about-red), var(--about-gold), transparent);
}

.about-journey-inner {
  max-width: var(--about-max-width);
  margin: 0 auto;
  text-align: center;
}

.about-journey-title {
  font-family: var(--about-font-heading);
  font-size: 1.8rem;
  margin: 0 0 0.6rem;
  color: var(--about-text);
}

.about-journey-desc {
  color: var(--about-text-secondary);
  font-size: 1rem;
  margin: 0 0 2.5rem;
}

/* 时间轴 */
.about-timeline {
  position: relative;
  text-align: left;
  max-width: 700px;
  margin: 0 auto;
  padding-left: 2rem;
}

.about-timeline-track {
  position: absolute;
  left: 0.7rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: rgba(255,215,0,0.2);
  z-index: 0;
}

.about-timeline-progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 0%;
  background: linear-gradient(to bottom, var(--about-gold), var(--about-red));
  z-index: 1;
  transition: height 1s ease;
}

[data-timeline].scrolled .about-timeline-progress {
  height: 100%;
}

.about-timeline-items {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.about-timeline-item {
  position: relative;
  padding-left: 1.8rem;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.about-timeline-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.about-timeline-dot {
  position: absolute;
  left: -1.55rem;
  top: 0.3rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--about-dark);
  border: 2px solid var(--about-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 3;
}

.about-timeline-dot-inner {
  display: block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--about-red);
  transition: transform 0.3s ease;
}

.about-timeline-item.visible .about-timeline-dot-inner {
  transform: scale(1.4);
}

.about-timeline-content {
  background: rgba(255,255,255,0.04);
  padding: 1rem 1.2rem;
  border-radius: 4px;
  border-left: 3px solid var(--about-gold);
}

.about-timeline-version {
  display: inline-block;
  font-family: var(--about-font-heading);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--about-red);
  background: rgba(230,57,70,0.15);
  padding: 0.2rem 0.8rem;
  border-radius: 2px;
  margin-bottom: 0.4rem;
}

.about-timeline-heading {
  font-family: var(--about-font-heading);
  font-size: 1.1rem;
  margin: 0 0 0.4rem;
  color: var(--about-text);
}

.about-timeline-text {
  font-size: 0.9rem;
  color: var(--about-text-secondary);
  line-height: 1.5;
  margin: 0;
}

/* ===== ADVANTAGES 核心优势 ===== */
.about-advantages {
  padding: 4rem 1.5rem 3rem;
  max-width: var(--about-max-width);
  margin: 0 auto;
  text-align: center;
}

.about-advantages-title {
  font-family: var(--about-font-heading);
  font-size: 1.8rem;
  margin: 0 0 2rem;
  color: var(--about-text);
}

.about-advantages-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  text-align: left;
}

.about-advantage-card {
  background: var(--about-card-bg);
  border-radius: 6px;
  padding: 1.8rem 1.5rem;
  border: 1px solid rgba(255,215,0,0.08);
  transition: border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  overflow: hidden;
}

.about-advantage-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(to bottom, var(--about-gold), var(--about-red));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.about-advantage-card:hover {
  border-color: rgba(255,215,0,0.25);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0,0,0,0.4);
}

.about-advantage-card:hover::after {
  opacity: 1;
}

.about-card-icon {
  margin-bottom: 1rem;
}

.about-card-title {
  font-family: var(--about-font-heading);
  font-size: 1.15rem;
  margin: 0 0 0.6rem;
  color: var(--about-text);
}

.about-card-text {
  font-size: 0.9rem;
  color: var(--about-text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* ===== DATA VISION 数据愿景 ===== */
.about-data-vision {
  padding: 3rem 1.5rem 4rem;
  background: rgba(230,57,70,0.06);
  position: relative;
}

.about-data-vision::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--about-blue), var(--about-neon), transparent);
}

.about-data-vision-inner {
  max-width: var(--about-max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: center;
}

.about-data-viz {
  position: relative;
  width: 100%;
  max-width: 480px;
  flex-shrink: 0;
}

.about-vision-img {
  width: 100%;
  height: auto;
  aspect-ratio: 3/2;
  object-fit: cover;
  display: block;
  border-radius: 4px;
}

.about-viz-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0,191,255,0.15), transparent);
  border-radius: 4px;
  pointer-events: none;
}

.about-data-text {
  flex: 1;
  text-align: center;
}

.about-vision-title {
  font-family: var(--about-font-heading);
  font-size: 1.6rem;
  margin: 0 0 1rem;
  color: var(--about-text);
}

.about-vision-desc {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--about-text-secondary);
  margin: 0 0 1.8rem;
  max-width: 560px;
}

.about-vision-links {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.about-vision-btn {
  display: inline-block;
  font-family: var(--about-font-heading);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--about-text);
  background: var(--about-red);
  padding: 0.75rem 2rem;
  border-radius: 4px;
  text-decoration: none;
  transition: background 0.3s ease, transform 0.3s ease;
  border: none;
  cursor: pointer;
}

.about-vision-btn:hover {
  background: #c5303e;
  transform: translateY(-2px);
}

.about-vision-btn--outline {
  background: transparent;
  border: 2px solid var(--about-gold);
  color: var(--about-gold);
}

.about-vision-btn--outline:hover {
  background: rgba(255,215,0,0.1);
  border-color: var(--about-red);
  color: var(--about-red);
}

/* ===== CONTACT NOTE ===== */
.about-contact-note {
  padding: 2rem 1.5rem;
  border-top: 1px solid rgba(255,215,0,0.1);
}

.about-contact-inner {
  max-width: var(--about-max-width);
  margin: 0 auto;
  text-align: center;
}

.about-contact-text {
  font-size: 0.85rem;
  color: var(--about-text-secondary);
  margin: 0 0 0.3rem;
  letter-spacing: 0.02em;
}

.about-contact-small {
  font-size: 0.75rem;
  color: rgba(176,176,176,0.6);
  margin: 0;
}

/* ===== 响应式 ===== */
@media (min-width: 640px) {
  .about-hero-title {
    font-size: 3.8rem;
  }
  .about-hero-sub {
    font-size: 1.2rem;
  }
  .about-mission-stats {
    gap: 2rem;
  }
  .about-stat-num {
    font-size: 1.6rem;
  }
  .about-advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .about-timeline {
    padding-left: 2.5rem;
  }
  .about-timeline-track {
    left: 1rem;
  }
  .about-timeline-dot {
    left: -1.35rem;
  }
}

@media (min-width: 900px) {
  .about-hero {
    min-height: 80vh;
  }
  .about-hero-title {
    font-size: 4.8rem;
  }
  .about-hero-accent {
    display: inline;
    font-size: 1em;
  }
  .about-mission-inner {
    flex-direction: row;
    gap: 4rem;
  }
  .about-mission-visual {
    max-width: 420px;
  }
  .about-mission-title {
    font-size: 2rem;
  }
  .about-journey-title {
    font-size: 2rem;
  }
  .about-advantages-title {
    font-size: 2rem;
  }
  .about-advantages-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.8rem;
  }
  .about-data-vision-inner {
    flex-direction: row;
    gap: 3rem;
    text-align: left;
  }
  .about-data-text {
    text-align: left;
  }
  .about-vision-links {
    justify-content: flex-start;
  }
  .about-vision-title {
    font-size: 1.8rem;
  }
  .about-timeline-content {
    padding: 1.2rem 1.5rem;
  }
}

@media (min-width: 1100px) {
  .about-hero-title {
    font-size: 5.6rem;
  }
  .about-mission-visual {
    max-width: 480px;
  }
  .about-advantages-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .about-advantage-card {
    padding: 2rem 1.5rem;
  }
}

/* ===== 滚动触发动画辅助 ===== */
@media (prefers-reduced-motion: reduce) {
  .about-hero-line,
  .about-timeline-item,
  .about-timeline-dot-inner,
  .about-advantage-card {
    animation: none !important;
    transition: none !important;
  }
  .about-timeline-item {
    opacity: 1;
    transform: none;
  }
  .about-timeline-progress {
    height: 100% !important;
  }
}
</style>