.page-about {
  --page-hero-min-height: 80vh;
  --page-timeline-color: var(--color-gold);
  --page-gold-dot: var(--color-gold);
  --page-line-accent: var(--color-divider);
  --page-card-bg: var(--color-blue-deep);
  --page-glass: var(--color-glass);
  overflow-x: hidden;
  background-color: var(--color-bg-dark);
  color: var(--color-text-primary);
  font-family: var(--font-body);
}

/* Hero 区域 */
.page-about__hero {
  position: relative;
  min-height: var(--page-hero-min-height);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-bg-dark) 0%, var(--color-blue-deep) 70%);
}

.page-about__hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about__hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
  filter: grayscale(0.6) contrast(1.2);
}

.page-about__hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(to right, rgba(11, 13, 23, 0.9) 0%, rgba(26, 43, 76, 0.5) 100%);
}

.page-about__hero-content {
  position: relative;
  z-index: 2;
  text-align: left;
  width: 100%;
  padding: 4rem 1.5rem;
}

.page-about__kicker {
  font-family: var(--font-data);
  font-size: var(--fs-small);
  color: var(--color-gold);
  letter-spacing: 0.2em;
  display: block;
  margin-bottom: 1rem;
  text-transform: uppercase;
}

.page-about__title {
  font-family: var(--font-heading);
  font-size: var(--fs-h1);
  line-height: 1.1;
  margin: 0 0 1.5rem;
  color: var(--color-text-primary);
  text-shadow: 0 4px 12px rgba(0, 0, 0, 0.6);
}

.page-about__subtitle {
  font-family: var(--font-body);
  font-size: calc(var(--fs-body) * 1.2);
  color: var(--color-text-secondary);
  max-width: 520px;
  line-height: 1.5;
  border-left: 4px solid var(--color-accent);
  padding-left: 1rem;
}

/* 品牌使命 */
.page-about__mission {
  padding: 4rem 0;
  position: relative;
}

.page-about__mission::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(to right, var(--color-accent), transparent);
}

.page-about__mission-grid {
  display: grid;
  gap: 2rem;
}

.page-about__mission-left {
  order: 1;
}

.page-about__section-index {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--color-gold);
  letter-spacing: 0.15em;
  margin-bottom: 0.5rem;
  padding: 0.2rem 0.5rem;
  border: 1px solid var(--color-divider);
}

.page-about__section-title {
  font-family: var(--font-heading);
  font-size: var(--fs-h2);
  line-height: 1.2;
  margin: 0 0 1.5rem;
  color: var(--color-text-primary);
}

.page-about__mission-text {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: 2rem;
}

.page-about__mission-right {
  order: 2;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding: 1.5rem;
  background: var(--page-card-bg);
  backdrop-filter: blur(8px);
  border-radius: 12px;
  border: 1px solid var(--color-divider);
}

.page-about__mission-card {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1.25rem;
  background: var(--color-glass);
  border-radius: 8px;
  border-left: 3px solid var(--color-accent);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-about__mission-card:hover {
  transform: translateX(6px);
  box-shadow: 0 4px 20px rgba(255, 107, 53, 0.15);
}

.page-about__mission-card-icon {
  font-size: 2rem;
  line-height: 1;
  margin-bottom: 0.5rem;
}

.page-about__mission-card-title {
  font-family: var(--font-heading);
  font-size: calc(var(--fs-body) * 1.1);
  margin: 0;
  color: var(--color-text-primary);
  letter-spacing: -0.3px;
}

.page-about__mission-card-text {
  font-family: var(--font-body);
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
  margin: 0;
}

/* 时间线 */
.page-about__timeline {
  padding: 4rem 0;
  position: relative;
  background: linear-gradient(180deg, var(--color-bg-dark) 0%, var(--color-blue-deep) 100%);
}

.page-about__timeline-header {
  margin-bottom: 3rem;
  text-align: left;
}

.page-about__timeline-track {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.page-about__timeline-line {
  position: absolute;
  left: 1.5rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-gold), var(--color-accent), transparent);
  z-index: 0;
}

.page-about__timeline-item {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: relative;
  z-index: 1;
  padding-left: 3.5rem;
}

.page-about__timeline-dot {
  position: absolute;
  left: 0.5rem;
  top: 0.5rem;
  width: 14px;
  height: 14px;
  background: var(--color-gold);
  border-radius: 50%;
  border: 3px solid var(--color-bg-dark);
  box-shadow: 0 0 0 2px var(--color-gold);
  z-index: 2;
}

.page-about__timeline-content {
  padding: 1.5rem;
  background: var(--page-card-bg);
  backdrop-filter: blur(6px);
  border-radius: 12px;
  border: 1px solid var(--color-divider);
  transition: background 0.3s ease;
}

.page-about__timeline-content:hover {
  background: rgba(255, 255, 255, 0.12);
}

.page-about__timeline-marker {
  font-family: var(--font-data);
  font-size: var(--fs-small);
  color: var(--color-gold);
  display: inline-block;
  margin-bottom: 0.5rem;
  padding: 0.1rem 0.4rem;
  border: 1px solid var(--color-gold);
  border-radius: 4px;
}

.page-about__timeline-heading {
  font-family: var(--font-heading);
  font-size: calc(var(--fs-body) * 1.2);
  margin: 0 0 0.5rem;
  color: var(--color-text-primary);
}

.page-about__timeline-desc {
  font-size: var(--fs-body);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

.page-about__timeline-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  margin-top: 1rem;
  border-radius: 8px;
  object-fit: cover;
  border: 1px solid var(--color-divider);
}

.page-about__timeline-phone {
  margin-top: 3rem;
  text-align: center;
}

.page-about__phone-img {
  width: 100%;
  max-width: 300px;
  height: auto;
  object-fit: contain;
  border-radius: 12px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
  border: 1px solid var(--color-divider);
}

/* 地域区块 */
.page-about__location {
  padding: 4rem 0;
  position: relative;
}

.page-about__location::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(to right, transparent, var(--color-accent));
}

.page-about__location-grid {
  display: grid;
  gap: 2rem;
}

.page-about__location-left {
  order: 1;
}

.page-about__location-text {
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: 2rem;
}

.page-about__location-address {
  padding: 1.5rem;
  background: var(--page-card-bg);
  backdrop-filter: blur(6px);
  border-radius: 12px;
  margin-bottom: 2rem;
  border-left: 4px solid var(--color-accent);
}

.page-about__address-label {
  font-family: var(--font-data);
  font-size: var(--fs-small);
  color: var(--color-gold);
  display: block;
  margin-bottom: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.page-about__address-line {
  font-size: calc(var(--fs-body) * 1.1);
  font-weight: 600;
  margin: 0 0 0.5rem;
  color: var(--color-text-primary);
}

.page-about__address-note {
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
  display: block;
  line-height: 1.5;
}

.page-about__contact-link {
  display: inline-block;
  padding: 0.75rem 2rem;
  font-family: var(--font-body);
  font-size: var(--fs-body);
  text-decoration: none;
  color: var(--color-text-primary);
  background: var(--color-accent);
  border: none;
  border-radius: 6px;
  transition: background 0.3s ease, transform 0.2s ease;
  margin-bottom: 1rem;
}

.page-about__contact-link:hover {
  background: #e55a2b;
  transform: translateY(-2px);
}

.page-about__location-right {
  order: 2;
}

.page-about__location-image-wrapper {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--color-divider);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
}

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

/* 内部导航 */
.page-about__internal-nav {
  padding: 2rem 0 4rem;
}

.page-about__internal-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: flex-start;
}

.page-about__internal-list .btn {
  font-family: var(--font-body);
  font-size: var(--fs-small);
  text-decoration: none;
  padding: 0.5rem 1.25rem;
  border-radius: 6px;
  transition: background 0.3s ease, color 0.3s ease;
}

.page-about__internal-list .btn--secondary {
  background: transparent;
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
}

.page-about__internal-list .btn--secondary:hover {
  background: var(--color-accent);
  color: var(--color-bg-dark);
}

.page-about__internal-list .btn--primary {
  background: var(--color-accent);
  color: var(--color-text-primary);
  border: none;
}

.page-about__internal-list .btn--primary:hover {
  background: #e55a2b;
}

/* 回到顶部按钮 */
.scroll-top {
  position: fixed;
  bottom: 2rem;
  right: 1.5rem;
  z-index: 100;
  width: 48px;
  height: 48px;
  background: var(--color-accent);
  color: var(--color-text-primary);
  border: none;
  border-radius: 50%;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: opacity 0.3s ease, transform 0.3s ease;
  opacity: 0;
  pointer-events: none;
  box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
}

.scroll-top[data-visible="true"] {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.scroll-top:hover {
  background: #e55a2b;
  transform: translateY(-4px);
}

/* 移动端优先：小屏幕 */
@media (max-width: 767.98px) {
  .page-about__hero {
    min-height: 70vh;
  }

  .page-about__hero-content {
    padding: 3rem 1rem;
  }

  .page-about__title {
    font-size: clamp(2.2rem, 8vw, 3.5rem);
  }

  .page-about__mission-grid,
  .page-about__location-grid {
    grid-template-columns: 1fr;
  }

  .page-about__mission,
  .page-about__timeline,
  .page-about__location {
    padding: 3rem 0;
  }

  .page-about__timeline-track {
    gap: 1.5rem;
  }

  .page-about__timeline-item {
    padding-left: 3rem;
  }

  .page-about__timeline-line {
    left: 1rem;
  }

  .page-about__timeline-dot {
    left: 0.25rem;
    width: 12px;
    height: 12px;
  }

  .page-about__timeline-content {
    padding: 1rem;
  }

  .page-about__phone-img {
    max-width: 200px;
  }

  .page-about__internal-list {
    flex-direction: column;
    align-items: stretch;
  }

  .page-about__internal-list .btn {
    text-align: center;
  }

  .page-about__location-image-wrapper {
    margin-top: 1rem;
  }

  .page-about__contact-link {
    width: 100%;
    text-align: center;
  }
}

/* 桌面端 */
@media (min-width: 768px) {
  .page-about__hero {
    min-height: 80vh;
  }

  .page-about__hero-content {
    padding: 6rem 2rem;
  }

  .page-about__mission-grid {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }

  .page-about__mission-left {
    order: 0;
  }

  .page-about__mission-right {
    order: 0;
  }

  .page-about__timeline {
    padding: 6rem 0;
  }

  .page-about__timeline-header {
    text-align: left;
    margin-bottom: 4rem;
  }

  .page-about__timeline-track {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem 3rem;
    position: relative;
  }

  .page-about__timeline-line {
    left: 50%;
    transform: translateX(-50%);
    height: 100%;
  }

  .page-about__timeline-item {
    padding-left: 2rem;
    flex-direction: row;
    align-items: flex-start;
  }

  .page-about__timeline-item:nth-child(odd) {
    grid-column: 1;
    padding-right: 2rem;
    padding-left: 0;
    text-align: right;
    justify-content: flex-end;
  }

  .page-about__timeline-item:nth-child(odd) .page-about__timeline-content {
    border-left: none;
    border-right: 3px solid var(--color-accent);
  }

  .page-about__timeline-item:nth-child(even) {
    grid-column: 2;
    padding-left: 2rem;
  }

  .page-about__timeline-dot {
    left: auto;
    right: auto;
    top: 0.75rem;
  }

  .page-about__timeline-item:nth-child(odd) .page-about__timeline-dot {
    right: -9px;
    left: auto;
  }

  .page-about__timeline-item:nth-child(even) .page-about__timeline-dot {
    left: -9px;
    right: auto;
  }

  .page-about__timeline-content {
    width: 100%;
  }

  .page-about__timeline-phone {
    margin-top: 4rem;
  }

  .page-about__phone-img {
    max-width: 360px;
  }

  .page-about__location-grid {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }

  .page-about__location-left {
    order: 0;
  }

  .page-about__location-right {
    order: 0;
  }

  .page-about__internal-list {
    gap: 1rem;
  }

  .page-about__internal-list .btn {
    padding: 0.6rem 1.5rem;
  }
}

/* 大桌面特殊处理 */
@media (min-width: 992px) {
  .page-about__timeline-track {
    gap: 2.5rem 4rem;
  }

  .page-about__timeline-content {
    padding: 1.75rem;
  }
}