/* ===== 品牌故事（about）页面专属样式 ===== */
.page-about {
  --about-hero-bg: #0D0D0D;
  --about-timeline-bg: #111122;
  --about-commitments-bg: #0D0D0D;
  --about-card-border: 2px solid #FF6B35;
  --about-card-shadow: 0 8px 32px rgba(255, 107, 53, 0.18);
  --about-timeline-marker-size: 20px;
  --about-step-hover-scale: 1.04;

  display: flex;
  flex-direction: column;
  gap: 0;
  background: var(--about-hero-bg);
  color: var(--primary-text, #FFFFFF);
  font-family: var(--body-font, 'Inter', sans-serif);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ---- 面包屑 ---- */
.about-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 1rem 1.25rem;
  font-size: var(--body-scale-2, 14px);
  color: rgba(255,255,255,0.65);
  max-width: var(--max-width, 1440px);
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}
.about-breadcrumb a {
  color: var(--brand-accent, #FF6B35);
  text-decoration: none;
  transition: opacity 0.2s;
}
.about-breadcrumb a:hover {
  opacity: 0.75;
}
.breadcrumb-sep {
  margin: 0 0.2rem;
  color: rgba(255,255,255,0.35);
  user-select: none;
}
.about-breadcrumb [aria-current="page"] {
  color: rgba(255,255,255,0.85);
  font-weight: 500;
}

/* ---- 首屏分屏 ---- */
.about-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2.5rem 1.25rem 2rem;
  gap: 2rem;
  max-width: var(--max-width, 1440px);
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}
.hero-text {
  flex: 1 1 100%;
  text-align: center;
}
.hero-text h1 {
  font-family: var(--heading-font, 'Montserrat', sans-serif);
  font-weight: 900;
  font-size: clamp(2rem, 8vw, var(--heading-scale-1, 64px));
  line-height: 1.1;
  margin: 0 0 1rem;
  color: var(--primary-text, #FFFFFF);
  letter-spacing: -0.02em;
  text-transform: uppercase;
}
.hero-sub {
  font-size: clamp(1rem, 3vw, var(--body-scale-1, 16px));
  color: rgba(255,255,255,0.8);
  max-width: 36em;
  margin: 0 auto;
  line-height: 1.7;
}
.hero-visual {
  flex: 1 1 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
}
.hero-svg {
  width: 100%;
  max-width: 480px;
  height: auto;
  display: block;
  filter: drop-shadow(0 4px 24px rgba(255, 107, 53, 0.25));
}

/* ---- 时间轴区块 ---- */
.about-timeline-section {
  background: var(--about-timeline-bg);
  padding: 2.5rem 1.25rem;
  position: relative;
}
.timeline-inner {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  max-width: var(--max-width, 1440px);
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}
.timeline-image-wrap {
  display: none;
}
.timeline-bg-img {
  width: 100%;
  height: auto;
  max-width: 400px;
  display: block;
  object-fit: cover;
  border-radius: 4px;
  box-shadow: var(--shadow, 0 8px 32px rgba(255,107,53,0.2));
}
.timeline-content {
  flex: 1;
}
.timeline-content h2 {
  font-family: var(--heading-font, 'Montserrat', sans-serif);
  font-weight: 900;
  font-size: clamp(1.6rem, 5vw, var(--heading-scale-2, 48px));
  margin: 0 0 0.5rem;
  color: var(--primary-text, #FFFFFF);
  letter-spacing: -0.01em;
}
.timeline-intro {
  font-size: var(--body-scale-2, 14px);
  color: rgba(255,255,255,0.7);
  margin: 0 0 2rem;
  max-width: 32em;
}
.timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0;
  padding-left: 2.8rem;
}
.timeline-line-svg {
  position: absolute;
  left: 0.95rem;
  top: 0;
  bottom: 0;
  width: 4px;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}
.timeline-step {
  position: relative;
  display: flex;
  gap: 1.2rem;
  padding: 1.2rem 1rem 1.2rem 0;
  border-radius: 8px;
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.35s ease;
  cursor: default;
  border-left: 2px solid transparent;
}
.timeline-step:hover,
.timeline-step:focus-visible {
  transform: scale(var(--about-step-hover-scale));
  box-shadow: 0 4px 24px rgba(255, 107, 53, 0.12);
  border-left-color: var(--brand-accent, #FF6B35);
  outline: none;
}
.timeline-step:focus-visible {
  outline: 2px solid var(--brand-accent, #FF6B35);
  outline-offset: 4px;
}
.step-marker {
  position: absolute;
  left: -2.8rem;
  top: 1.5rem;
  width: var(--about-timeline-marker-size);
  height: var(--about-timeline-marker-size);
  border-radius: 50%;
  background: var(--brand-accent, #FF6B35);
  border: 3px solid var(--about-timeline-bg, #111122);
  box-shadow: 0 0 0 2px var(--brand-accent, #FF6B35);
  z-index: 2;
  flex-shrink: 0;
  transition: transform 0.35s ease, box-shadow 0.35s ease;
}
.timeline-step:hover .step-marker,
.timeline-step:focus-visible .step-marker {
  transform: scale(1.25);
  box-shadow: 0 0 0 4px var(--brand-accent, #FF6B35), 0 0 20px rgba(255, 107, 53, 0.3);
}
.step-content {
  flex: 1;
  min-width: 0;
}
.step-title {
  font-family: var(--heading-font, 'Montserrat', sans-serif);
  font-weight: 700;
  font-size: clamp(1.1rem, 3vw, var(--heading-scale-4, 24px));
  margin: 0 0 0.35rem;
  color: var(--brand-accent, #FF6B35);
  letter-spacing: -0.01em;
}
.step-desc {
  font-size: var(--body-scale-2, 14px);
  color: rgba(255,255,255,0.8);
  margin: 0;
  line-height: 1.7;
  max-width: 34em;
}

/* ---- 承诺卡片区块 ---- */
.about-commitments-section {
  background: var(--about-commitments-bg);
  padding: 2.5rem 1.25rem 3rem;
  position: relative;
}
.commitments-inner {
  max-width: var(--max-width, 1440px);
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}
.commitments-inner h2 {
  font-family: var(--heading-font, 'Montserrat', sans-serif);
  font-weight: 900;
  font-size: clamp(1.6rem, 5vw, var(--heading-scale-2, 48px));
  margin: 0 0 0.5rem;
  color: var(--primary-text, #FFFFFF);
  letter-spacing: -0.01em;
}
.commitments-intro {
  font-size: var(--body-scale-2, 14px);
  color: rgba(255,255,255,0.7);
  margin: 0 0 2rem;
  max-width: 28em;
}
.commitment-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
.commitment-card {
  position: relative;
  background: var(--card-background, rgba(26,26,46,0.85));
  border: 2px solid var(--border-accent, #FF6B35);
  border-radius: 12px;
  padding: 1.5rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  box-shadow: var(--shadow, 0 8px 32px rgba(255,107,53,0.2));
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  overflow: hidden;
}
.commitment-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(255, 107, 53, 0.3);
}
.commitment-card-featured {
  position: relative;
}
.commitment-card-bg-wrap {
  position: absolute;
  inset: 0;
  overflow: hidden;
  border-radius: 10px;
  z-index: 0;
  opacity: 0.25;
}
.commitment-card-bg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.commitment-card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(13,13,13,0.6) 0%, rgba(13,13,13,0.2) 100%);
  z-index: 1;
  border-radius: 10px;
}
.commitment-card-content {
  position: relative;
  z-index: 2;
}
.commitment-icon {
  font-size: 2rem;
  line-height: 1;
  display: inline-block;
  color: var(--icon-color, #FF6B35);
  filter: drop-shadow(0 2px 8px rgba(0,0,0,0.3));
}
.commitment-title {
  font-family: var(--heading-font, 'Montserrat', sans-serif);
  font-weight: 700;
  font-size: clamp(1.05rem, 2.5vw, var(--heading-scale-4, 24px));
  margin: 0;
  color: var(--primary-text, #FFFFFF);
  letter-spacing: -0.01em;
}
.commitment-desc {
  font-size: var(--body-scale-2, 14px);
  color: rgba(255,255,255,0.78);
  margin: 0;
  line-height: 1.7;
}
.commitment-card .commitment-icon {
  margin-bottom: 0.2rem;
}

/* ---- 结语区块 ---- */
.about-conclusion {
  background: linear-gradient(180deg, #0D0D0D 0%, #111122 100%);
  padding: 2rem 1.25rem 2.5rem;
}
.conclusion-inner {
  max-width: var(--max-width, 1440px);
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  align-items: center;
}
.conclusion-img {
  width: 100%;
  height: auto;
  max-width: 1200px;
  display: block;
  border-radius: 8px;
  box-shadow: var(--shadow, 0 8px 32px rgba(255,107,53,0.2));
  object-fit: cover;
}
.conclusion-text-box {
  text-align: center;
  max-width: 52em;
}
.conclusion-tagline {
  font-family: var(--heading-font, 'Montserrat', sans-serif);
  font-weight: 700;
  font-size: clamp(1.2rem, 3.5vw, var(--heading-scale-3, 36px));
  color: var(--brand-accent, #FF6B35);
  margin: 0 0 0.75rem;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.conclusion-desc {
  font-size: var(--body-scale-2, 14px);
  color: rgba(255,255,255,0.8);
  margin: 0 0 1.5rem;
  line-height: 1.8;
}
.conclusion-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.25rem 0.6rem;
  font-size: var(--body-scale-2, 14px);
}
.conclusion-link {
  color: var(--brand-accent, #FF6B35);
  text-decoration: none;
  font-weight: 500;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s, color 0.2s;
}
.conclusion-link:hover {
  border-bottom-color: var(--brand-accent, #FF6B35);
  color: var(--data-highlight, #00FF87);
}
.link-sep {
  color: rgba(255,255,255,0.3);
  user-select: none;
}

/* ===== 桌面端（≥768px） ===== */
@media (min-width: 768px) {
  .about-hero {
    flex-direction: row;
    padding: 4rem 2rem 3rem;
    gap: 3rem;
    text-align: left;
  }
  .hero-text {
    flex: 1 1 55%;
    text-align: left;
  }
  .hero-text h1 {
    font-size: var(--heading-scale-1, 64px);
    margin-bottom: 1.2rem;
  }
  .hero-sub {
    margin: 0;
    font-size: var(--body-scale-1, 16px);
  }
  .hero-visual {
    flex: 1 1 45%;
    justify-content: flex-end;
  }
  .hero-svg {
    max-width: 100%;
  }

  .about-timeline-section {
    padding: 4rem 2rem;
  }
  .timeline-inner {
    flex-direction: row;
    gap: 3rem;
    align-items: flex-start;
  }
  .timeline-image-wrap {
    display: block;
    flex: 0 0 280px;
    max-width: 400px;
  }
  .timeline-bg-img {
    height: auto;
    max-height: 800px;
  }
  .timeline-content {
    flex: 1;
  }
  .timeline-content h2 {
    font-size: var(--heading-scale-2, 48px);
  }
  .timeline {
    padding-left: 3.2rem;
  }
  .timeline-line-svg {
    left: 1.2rem;
  }
  .step-marker {
    left: -3.2rem;
    width: 24px;
    height: 24px;
  }
  .step-title {
    font-size: var(--heading-scale-4, 24px);
  }
  .step-desc {
    font-size: var(--body-scale-1, 16px);
  }

  .about-commitments-section {
    padding: 4rem 2rem 5rem;
  }
  .commitments-inner h2 {
    font-size: var(--heading-scale-2, 48px);
  }
  .commitment-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
  .commitment-card {
    padding: 1.8rem 1.5rem;
  }
  .commitment-icon {
    font-size: 2.4rem;
  }

  .about-conclusion {
    padding: 3rem 2rem 4rem;
  }
  .conclusion-inner {
    gap: 2rem;
  }
  .conclusion-tagline {
    font-size: var(--heading-scale-3, 36px);
  }
  .conclusion-desc {
    font-size: var(--body-scale-1, 16px);
  }
}

/* ===== 大桌面端（≥1024px） ===== */
@media (min-width: 1024px) {
  .about-hero {
    padding: 5rem 2.5rem 4rem;
    gap: 4rem;
  }
  .hero-text h1 {
    font-size: var(--heading-scale-1, 64px);
  }
  .timeline-image-wrap {
    flex-basis: 340px;
  }
  .timeline-content h2 {
    font-size: var(--heading-scale-2, 48px);
  }
  .commitment-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .conclusion-img {
    max-height: 400px;
    object-fit: cover;
  }
}

/* ===== 超大桌面端（≥1440px） ===== */
@media (min-width: 1440px) {
  .about-hero {
    padding: 6rem 2.5rem 5rem;
  }
  .about-timeline-section {
    padding: 5rem 2.5rem;
  }
  .about-commitments-section {
    padding: 5rem 2.5rem 6rem;
  }
}

.page-about {
  --icon-color: currentColor;
}