/* ===== 页面作用域 .page-about ===== */
.page-about {
  --about-hero-min-h: 560px;
  --about-shape-size: 320px;
  --about-card-radius: 12px;
  --about-glass-bg: rgba(255, 255, 255, 0.06);
  --about-glass-border: rgba(255, 255, 255, 0.10);
  --about-glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.37);
  --about-transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  color: var(--clr-text-light);
  background: var(--clr-bg-dark);
  overflow-x: hidden;
}

/* ---- 首屏 Hero ---- */
.about-hero {
  position: relative;
  min-height: var(--about-hero-min-h);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 2rem 1rem;
  isolation: isolate;
}

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

.hero-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
  filter: grayscale(0.6) contrast(1.2);
}

.hero-shape {
  position: absolute;
  z-index: 1;
  width: var(--about-shape-size);
  height: var(--about-shape-size);
  border-radius: 0;
  pointer-events: none;
}

.hero-shape--primary {
  top: -80px;
  left: -60px;
  background: linear-gradient(135deg, rgba(0, 168, 142, 0.55), rgba(0, 122, 100, 0.30));
  transform: skewX(-10deg) rotate(10deg);
  box-shadow: 0 0 80px rgba(0, 168, 142, 0.20);
}

.hero-shape--accent {
  bottom: -60px;
  right: -40px;
  background: linear-gradient(220deg, rgba(255, 107, 53, 0.50), rgba(255, 140, 90, 0.20));
  transform: skewX(-8deg) rotate(-12deg);
  box-shadow: 0 0 80px rgba(255, 107, 53, 0.18);
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  padding: 1rem;
}

.breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--clr-text-muted);
}

.breadcrumb a {
  color: var(--clr-primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--about-transition);
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  border-bottom-color: var(--clr-primary);
}

.breadcrumb .sep {
  color: var(--clr-metal);
  margin: 0 0.25rem;
}

.breadcrumb [aria-current="page"] {
  color: var(--clr-text-light);
  font-weight: 600;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.8rem, 12vw, 5.5rem);
  font-weight: 900;
  font-style: italic;
  letter-spacing: 0.06em;
  color: var(--clr-text-light);
  text-shadow: 0 0 40px rgba(0, 168, 142, 0.35), 0 4px 20px rgba(0, 0, 0, 0.50);
  margin: 0 0 0.5rem;
  line-height: 1.1;
}

.hero-tagline {
  font-family: var(--font-heading);
  font-size: clamp(1rem, 4vw, 1.6rem);
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--clr-primary);
  text-shadow: 0 0 20px rgba(0, 168, 142, 0.30);
  margin: 0 0 0.75rem;
}

.hero-desc {
  font-family: var(--font-body);
  font-size: clamp(0.95rem, 2.5vw, 1.2rem);
  color: var(--clr-text-muted);
  max-width: 600px;
  margin: 0 auto 1.5rem;
  line-height: 1.6;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}

/* ---- 品牌理念 ---- */
.about-mission {
  padding-top: 4rem;
  padding-bottom: 4rem;
}

.mission-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
}

.mission-text {
  order: 1;
}

.section-heading {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 5vw, 2.8rem);
  font-weight: 900;
  font-style: italic;
  color: var(--clr-primary);
  text-shadow: 0 0 30px rgba(0, 168, 142, 0.20);
  margin: 0 0 1.25rem;
  position: relative;
  display: inline-block;
}

.section-heading::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--clr-primary), transparent);
  margin-top: 0.5rem;
  border-radius: 2px;
}

.mission-lead {
  font-family: var(--font-heading);
  font-size: clamp(1.1rem, 3vw, 1.5rem);
  font-weight: 700;
  color: var(--clr-text-light);
  margin: 0 0 1rem;
}

.mission-body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--clr-text-muted);
  margin: 0 0 1rem;
}

.mission-cta {
  display: inline-block;
  margin-top: 0.75rem;
}

.mission-visual {
  order: 0;
}

.mission-img-wrapper {
  position: relative;
  border-radius: var(--about-card-radius);
  overflow: hidden;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.50);
}

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

.mission-img-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0, 168, 142, 0.15), transparent 60%);
  pointer-events: none;
}

/* ---- 功能区域 ---- */
.about-features {
  background: var(--clr-bg-medium);
  padding-top: 4rem;
  padding-bottom: 4rem;
  position: relative;
}

.about-features::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--clr-primary), var(--clr-accent), transparent);
  opacity: 0.5;
}

.features-heading {
  display: block;
}

.features-intro {
  font-family: var(--font-body);
  font-size: 1.05rem;
  color: var(--clr-text-muted);
  margin: -0.75rem 0 2.5rem;
  max-width: 480px;
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.feature-card {
  background: var(--about-glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--about-glass-border);
  border-radius: var(--about-card-radius);
  padding: 1.5rem 1.25rem;
  transition: transform var(--about-transition), border-color var(--about-transition), box-shadow var(--about-transition);
  box-shadow: var(--about-glass-shadow);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 168, 142, 0.30);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45), 0 0 30px rgba(0, 168, 142, 0.08);
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  font-size: 1.6rem;
  line-height: 1;
  transition: transform var(--about-transition);
}

.feature-card:hover .feature-icon {
  transform: scale(1.06);
}

.feature-icon--video {
  background: linear-gradient(135deg, #00A88E, #007A64);
  box-shadow: 0 4px 16px rgba(0, 168, 142, 0.30);
}

.feature-icon--away {
  background: linear-gradient(135deg, #FF6B35, #FF8C5A);
  box-shadow: 0 4px 16px rgba(255, 107, 53, 0.30);
}

.feature-icon--subscribe {
  background: linear-gradient(135deg, #00A88E, #007A64);
  box-shadow: 0 4px 16px rgba(0, 168, 142, 0.30);
}

.feature-icon--lineup {
  background: linear-gradient(135deg, #C0C0C0, #8A9BA8);
  box-shadow: 0 4px 16px rgba(192, 192, 192, 0.25);
}

.feature-icon--data {
  background: linear-gradient(135deg, #00A88E, #007A64);
  box-shadow: 0 4px 16px rgba(0, 168, 142, 0.30);
}

.feature-icon--calendar {
  background: linear-gradient(135deg, #FF6B35, #FF8C5A);
  box-shadow: 0 4px 16px rgba(255, 107, 53, 0.30);
}

.feature-icon-symbol {
  color: #fff;
  font-size: 1.4rem;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.30));
}

.feature-name {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--clr-text-light);
  margin: 0 0 0.35rem;
}

.feature-summary {
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--clr-text-muted);
  line-height: 1.5;
  margin: 0 0 0.5rem;
}

.feature-details {
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--clr-text-muted);
  line-height: 1.6;
  margin-top: 0.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 0.5rem;
}

.feature-details-toggle {
  cursor: pointer;
  color: var(--clr-primary);
  font-weight: 600;
  font-size: 0.85rem;
  padding: 0.25rem 0;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: color var(--about-transition);
}

.feature-details-toggle::-webkit-details-marker {
  display: none;
}

.feature-details-toggle::before {
  content: '+';
  display: inline-block;
  font-size: 1rem;
  font-weight: 700;
  transition: transform var(--about-transition);
  color: var(--clr-accent);
}

details[open] .feature-details-toggle::before {
  content: '−';
  transform: rotate(180deg);
}

.feature-details-toggle:hover {
  color: var(--clr-accent-light);
}

.feature-details-text {
  margin: 0.5rem 0 0;
  padding-left: 0.25rem;
}

/* ---- 服务承诺 ---- */
.about-commitment {
  padding-top: 4rem;
  padding-bottom: 4rem;
}

.commitment-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
}

.commitment-lead {
  font-family: var(--font-heading);
  font-size: clamp(1.05rem, 2.8vw, 1.35rem);
  font-weight: 700;
  color: var(--clr-text-light);
  margin: 0 0 1.5rem;
}

.commitment-list {
  list-style: none;
  margin: 0 0 2rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.commitment-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--clr-text-muted);
  line-height: 1.6;
}

.commitment-icon {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--clr-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  margin-top: 0.15rem;
  box-shadow: 0 0 12px rgba(0, 168, 142, 0.30);
}

.commitment-contact {
  background: var(--about-glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--about-glass-border);
  border-radius: var(--about-card-radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
}

.commitment-contact-label {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--clr-text-light);
  margin: 0 0 0.5rem;
}

.commitment-contact-item {
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--clr-text-muted);
  margin: 0;
  line-height: 1.7;
}

.commitment-contact-note {
  font-family: var(--font-body);
  font-size: 0.8rem;
  color: var(--clr-text-muted);
  margin: 0.5rem 0 0;
  padding-top: 0.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  font-style: italic;
}

.commitment-cta {
  display: inline-block;
}

.commitment-visual {
  display: flex;
  justify-content: center;
}

.commitment-img-wrapper {
  position: relative;
  width: 100%;
  max-width: 400px;
  border-radius: var(--about-card-radius);
  overflow: hidden;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.50);
}

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

.commitment-img-ring {
  position: absolute;
  inset: -6px;
  border: 2px solid rgba(255, 107, 53, 0.25);
  border-radius: calc(var(--about-card-radius) + 4px);
  pointer-events: none;
  box-shadow: 0 0 30px rgba(255, 107, 53, 0.08);
}

/* ---- 内链导航 ---- */
.about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  padding-top: 2rem;
  padding-bottom: 3rem;
  justify-content: center;
}

.link-card {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--about-glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--about-glass-border);
  border-radius: var(--radius);
  padding: 0.75rem 1.25rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--clr-text-light);
  text-decoration: none;
  transition: border-color var(--about-transition), background var(--about-transition), transform var(--about-transition);
}

.link-card:hover,
.link-card:focus-visible {
  border-color: var(--clr-primary);
  background: rgba(0, 168, 142, 0.10);
  transform: translateY(-2px);
}

.link-card-icon {
  font-size: 0.75rem;
  color: var(--clr-primary);
  transition: transform var(--about-transition);
}

.link-card:hover .link-card-icon {
  transform: translateX(2px);
}

/* ---- 通用组件微调 ---- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--clr-primary);
  color: #fff;
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 700;
  padding: 0.7rem 1.6rem;
  border-radius: var(--radius);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background var(--about-transition), box-shadow var(--about-transition), transform var(--about-transition);
  box-shadow: 0 4px 16px rgba(0, 168, 142, 0.25);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--clr-primary-dark);
  box-shadow: 0 6px 24px rgba(0, 168, 142, 0.35);
  transform: translateY(-2px);
}

.btn-accent {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--clr-accent);
  color: #fff;
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 700;
  padding: 0.7rem 1.6rem;
  border-radius: var(--radius);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background var(--about-transition), box-shadow var(--about-transition), transform var(--about-transition);
  box-shadow: 0 4px 16px rgba(255, 107, 53, 0.25);
}

.btn-accent:hover,
.btn-accent:focus-visible {
  background: var(--clr-accent-light);
  box-shadow: 0 6px 24px rgba(255, 107, 53, 0.35);
  transform: translateY(-2px);
}

.stat-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.9rem;
  border-radius: 20px;
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  border: 1px solid transparent;
}

.stat-badge--primary {
  background: rgba(0, 168, 142, 0.15);
  border-color: rgba(0, 168, 142, 0.30);
  color: var(--clr-primary);
}

.stat-badge--accent {
  background: rgba(255, 107, 53, 0.15);
  border-color: rgba(255, 107, 53, 0.30);
  color: var(--clr-accent);
}

.stat-badge--metal {
  background: rgba(192, 192, 192, 0.10);
  border-color: rgba(192, 192, 192, 0.20);
  color: var(--clr-metal);
}

/* ---- 响应式布局 ---- */
@media (min-width: 640px) {
  .features-grid {
    grid-template-columns: 1fr 1fr;
  }

  .about-links {
    justify-content: flex-start;
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-shape-size: 440px;
    --about-hero-min-h: 620px;
  }

  .hero-shape--primary {
    top: -120px;
    left: -80px;
  }

  .hero-shape--accent {
    bottom: -80px;
    right: -60px;
  }

  .mission-grid {
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
  }

  .mission-text {
    order: 0;
  }

  .mission-visual {
    order: 1;
  }

  .features-grid {
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1.5rem;
  }

  .commitment-grid {
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
  }

  .commitment-visual {
    order: 1;
    justify-content: flex-end;
  }

  .commitment-content {
    order: 0;
  }

  .about-links {
    gap: 1.5rem;
    padding-top: 3rem;
    padding-bottom: 4rem;
  }
}

@media (min-width: 1200px) {
  .page-about {
    --about-shape-size: 560px;
    --about-hero-min-h: 680px;
  }

  .hero-title {
    font-size: 5.5rem;
  }

  .features-grid {
    gap: 2rem;
  }

  .feature-card {
    padding: 2rem 1.5rem;
  }
}

/* ---- 滚动触发标记（无JS时无动画，内容完整） ---- */
[data-scroll-trigger] {
  opacity: 1;
  transform: none;
}