/* ===== 品牌档案页面专属样式 ===== */
.page-about {
  --about-hero-min-height: 70vh;
  --about-timeline-accent: var(--color-accent-neon-green, #39FF14);
  --about-card-glow: var(--color-hover-glow, rgba(184, 41, 240, 0.4));
  --about-glass-bg: rgba(22, 27, 34, 0.65);
  --about-glass-border: rgba(192, 192, 192, 0.12);
  position: relative;
  display: block;
  width: 100%;
  background-color: var(--color-bg-dark, #0D1117);
  color: var(--color-text-high-contrast, #FFFFFF);
  overflow-x: hidden;
}

/* ===== 首屏 — 杂志封面式 ===== */
.page-about__hero {
  position: relative;
  min-height: var(--about-hero-min-height, 70vh);
  display: flex;
  align-items: stretch;
  background: linear-gradient(145deg, var(--color-primary-deep-blue, #0A192F) 0%, var(--color-bg-dark, #0D1117) 70%);
  overflow: hidden;
  padding: 2rem 1.25rem;
}

.page-about__hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 30%, rgba(184, 41, 240, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 70%, rgba(57, 255, 20, 0.05) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

.page-about__hero-diagonal {
  position: absolute;
  top: -10%;
  right: -15%;
  width: 55%;
  height: 140%;
  background: linear-gradient(135deg, transparent 40%, rgba(184, 41, 240, 0.08) 60%, transparent 80%);
  transform: skewX(-12deg);
  pointer-events: none;
  z-index: 1;
}

.page-about__hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(192, 192, 192, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(192, 192, 192, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  z-index: 1;
}

.page-about__hero-inner {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* 面包屑 */
.page-about__breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-medium, #B0B0B0);
  margin-bottom: 2rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-divider, #30363D);
  width: 100%;
}

.page-about__breadcrumb-link {
  color: var(--color-text-medium, #B0B0B0);
  text-decoration: none;
  transition: color 0.2s;
}

.page-about__breadcrumb-link:hover,
.page-about__breadcrumb-link:focus-visible {
  color: var(--color-accent-neon-purple, #B829F0);
  outline: none;
}

.page-about__breadcrumb-sep {
  color: var(--color-divider, #30363D);
  font-size: 0.65rem;
}

.page-about__breadcrumb-current {
  color: var(--color-text-high-contrast, #FFFFFF);
  font-weight: 600;
}

/* 首屏内容布局 */
.page-about__hero-content {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: center;
}

.page-about__hero-visual {
  position: relative;
  width: 100%;
  max-width: 320px;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

.page-about__hero-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: contain;
  background: var(--color-bg-card, #161B22);
}

.page-about__hero-glass {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--about-glass-bg) 0%, transparent 60%);
  border: 1px solid var(--about-glass-border);
  border-radius: 8px;
  pointer-events: none;
}

.page-about__hero-text {
  text-align: center;
  max-width: 600px;
}

.page-about__hero-title {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: 800;
  font-size: clamp(2.8rem, 10vw, 5.5rem);
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--color-text-high-contrast, #FFFFFF);
  margin: 0 0 0.75rem;
  text-shadow: 0 2px 24px rgba(184, 41, 240, 0.15);
}

.page-about__hero-sub {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-weight: 500;
  font-size: clamp(1rem, 2.5vw, 1.35rem);
  letter-spacing: -0.01em;
  color: var(--color-accent-neon-purple, #B829F0);
  margin: 0 0 0.5rem;
}

.page-about__hero-desc {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-weight: 400;
  font-size: clamp(0.9rem, 1.8vw, 1.05rem);
  line-height: 1.6;
  color: var(--color-text-medium, #B0B0B0);
  margin: 0;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== 通用分区 ===== */
.page-about__section {
  padding: 3.5rem 1.25rem;
  position: relative;
}

.page-about__section-inner {
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  width: 100%;
}

.page-about__section-title {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: 800;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  letter-spacing: -0.02em;
  color: var(--color-text-high-contrast, #FFFFFF);
  margin: 0 0 1.5rem;
  position: relative;
  display: inline-block;
}

.page-about__section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: var(--color-accent-neon-purple, #B829F0);
  margin-top: 0.5rem;
  border-radius: 2px;
}

/* ===== 品牌使命 ===== */
.page-about__mission {
  background: linear-gradient(180deg, var(--color-bg-dark, #0D1117) 0%, var(--color-bg-card, #161B22) 100%);
}

.page-about__mission-card {
  background: var(--about-glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--about-glass-border);
  border-radius: 16px;
  padding: 2rem 1.5rem;
  position: relative;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  transition: box-shadow 0.3s ease;
}

.page-about__mission-card:hover {
  box-shadow: 0 8px 40px rgba(184, 41, 240, 0.15);
}

.page-about__mission-body {
  max-width: 720px;
}

.page-about__mission-text {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-weight: 400;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text-medium, #B0B0B0);
  margin: 0 0 1rem;
}

.page-about__mission-text:last-of-type {
  margin-bottom: 0;
}

.page-about__mission-emblem {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-divider, #30363D);
}

.page-about__emblem-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent-neon-purple, #B829F0);
}

.page-about__emblem-line {
  display: inline-block;
  width: 40px;
  height: 2px;
  background: var(--color-divider, #30363D);
}

/* ===== 更新机制 + 时间线 ===== */
.page-about__timeline-section {
  background: var(--color-bg-dark, #0D1117);
}

.page-about__timeline-heading {
  margin-bottom: 0.75rem;
}

.page-about__timeline-intro {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-weight: 400;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-medium, #B0B0B0);
  margin: 0 0 2.5rem;
  max-width: 640px;
}

.page-about__timeline-layout {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

/* 时间线垂直列表 */
.page-about__timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
  padding-left: 1.5rem;
  border-left: 2px solid var(--color-divider, #30363D);
}

.page-about__timeline-node {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  cursor: default;
  transition: transform 0.2s ease;
}

.page-about__timeline-node:hover {
  transform: translateX(4px);
}

.page-about__node-marker {
  position: absolute;
  left: -1.5rem;
  top: 0.35rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--about-timeline-accent, #39FF14);
  border: 3px solid var(--color-bg-dark, #0D1117);
  box-shadow: 0 0 0 2px var(--about-timeline-accent, #39FF14);
  transition: box-shadow 0.3s ease, transform 0.3s ease;
  transform: translateX(-50%);
  left: calc(-1.5rem - 1px);
}

.page-about__timeline-node:hover .page-about__node-marker {
  box-shadow: 0 0 0 4px var(--about-timeline-accent, #39FF14), 0 0 16px rgba(57, 255, 20, 0.3);
  transform: translateX(-50%) scale(1.15);
}

.page-about__node-content {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.page-about__node-label {
  font-family: var(--font-data, 'JetBrains Mono', monospace);
  font-weight: 500;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--about-timeline-accent, #39FF14);
  opacity: 0.9;
}

.page-about__node-desc {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
  color: var(--color-text-high-contrast, #FFFFFF);
}

.page-about__node-detail {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-weight: 400;
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--color-text-medium, #B0B0B0);
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, opacity 0.35s ease;
  opacity: 0;
}

.page-about__timeline-node:hover .page-about__node-detail,
.page-about__timeline-node:focus-within .page-about__node-detail {
  max-height: 60px;
  opacity: 1;
  margin-top: 0.25rem;
}

/* 时间线配图 */
.page-about__timeline-image-wrap {
  width: 100%;
  max-width: 560px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  align-self: center;
}

.page-about__timeline-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  background: var(--color-bg-card, #161B22);
}

/* ===== 服务特点卡片 ===== */
.page-about__features {
  background: linear-gradient(180deg, var(--color-bg-card, #161B22) 0%, var(--color-bg-dark, #0D1117) 100%);
}

.page-about__features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 1rem;
}

.page-about__feature-card {
  background: var(--about-glass-bg);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border: 1px solid var(--about-glass-border);
  border-radius: 16px;
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.page-about__feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px var(--about-card-glow);
  border-color: rgba(184, 41, 240, 0.2);
}

.page-about__feature-number {
  font-family: var(--font-data, 'JetBrains Mono', monospace);
  font-weight: 700;
  font-size: 3.2rem;
  line-height: 1;
  color: var(--color-accent-neon-purple, #B829F0);
  letter-spacing: -0.04em;
}

.page-about__feature-unit {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  color: var(--color-text-high-contrast, #FFFFFF);
  margin-top: 0.15rem;
}

.page-about__feature-desc {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-weight: 400;
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--color-text-medium, #B0B0B0);
  margin: 0.25rem 0 0;
}

/* ===== 底部区域 ===== */
.page-about__bottom {
  border-top: 1px solid var(--color-divider, #30363D);
  background: var(--color-bg-dark, #0D1117);
}

.page-about__bottom-grid {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: center;
}

.page-about__bottom-info {
  width: 100%;
  max-width: 280px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.page-about__bottom-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: contain;
  background: var(--color-bg-card, #161B22);
}

.page-about__bottom-text {
  text-align: center;
  max-width: 640px;
}

.page-about__trust-statement {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-weight: 500;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-high-contrast, #FFFFFF);
  margin: 0 0 1.5rem;
  padding: 1rem 1.25rem;
  background: rgba(184, 41, 240, 0.06);
  border-left: 3px solid var(--color-accent-neon-purple, #B829F0);
  border-radius: 4px;
}

.page-about__bottom-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.2rem;
  margin-bottom: 1.5rem;
  align-items: baseline;
}

.page-about__bottom-links-label {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-weight: 400;
  font-size: 0.85rem;
  color: var(--color-text-medium, #B0B0B0);
}

.page-about__bottom-link {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--color-text-medium, #B0B0B0);
  text-decoration: none;
  padding: 0.2rem 0;
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.page-about__bottom-link:hover,
.page-about__bottom-link:focus-visible {
  color: var(--color-accent-neon-purple, #B829F0);
  border-bottom-color: var(--color-accent-neon-purple, #B829F0);
  outline: none;
}

.page-about__contact-note {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin-bottom: 0.75rem;
}

.page-about__contact-item {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-weight: 400;
  font-size: 0.85rem;
  color: var(--color-text-medium, #B0B0B0);
}

.page-about__service-note {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-weight: 400;
  font-size: 0.8rem;
  color: var(--color-divider, #30363D);
  margin: 0;
  padding-top: 0.5rem;
  border-top: 1px solid var(--color-divider, #30363D);
}

/* ===== 动画: 渐入效果 ===== */
[data-reveal] {
  animation: about-fade-in 0.8s ease forwards;
}

@keyframes about-fade-in {
  0% {
    opacity: 0.7;
    transform: translateY(6px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== 桌面端媒体查询 ===== */
@media (min-width: 768px) {
  .page-about__hero {
    padding: 2.5rem 2rem;
    min-height: 65vh;
  }

  .page-about__hero-content {
    flex-direction: row;
    align-items: center;
    gap: 3rem;
  }

  .page-about__hero-visual {
    max-width: 360px;
    flex-shrink: 0;
  }

  .page-about__hero-text {
    text-align: left;
  }

  .page-about__hero-desc {
    margin-left: 0;
    margin-right: 0;
  }

  .page-about__hero-diagonal {
    width: 45%;
    right: -10%;
  }

  .page-about__section {
    padding: 5rem 2rem;
  }

  .page-about__mission-card {
    padding: 2.5rem 3rem;
  }

  .page-about__mission-body {
    max-width: 780px;
  }

  .page-about__timeline-layout {
    flex-direction: row;
    align-items: flex-start;
    gap: 3rem;
  }

  .page-about__timeline {
    flex: 1;
    max-width: 480px;
  }

  .page-about__timeline-image-wrap {
    flex: 1;
    max-width: 500px;
    align-self: flex-start;
    margin-top: 0.5rem;
  }

  .page-about__node-detail {
    max-height: none;
    opacity: 1;
    margin-top: 0.25rem;
  }

  .page-about__features-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }

  .page-about__feature-card {
    padding: 2.5rem 2rem;
  }

  .page-about__bottom-grid {
    flex-direction: row;
    align-items: center;
    gap: 3rem;
  }

  .page-about__bottom-info {
    max-width: 240px;
    flex-shrink: 0;
  }

  .page-about__bottom-text {
    text-align: left;
    flex: 1;
  }

  .page-about__bottom-links {
    justify-content: flex-start;
  }

  .page-about__contact-note {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.5rem 1.5rem;
  }
}

@media (min-width: 1024px) {
  .page-about__hero {
    padding: 3rem 2rem;
  }

  .page-about__hero-visual {
    max-width: 400px;
  }

  .page-about__section {
    padding: 6rem 2rem;
  }

  .page-about__timeline-image-wrap {
    max-width: 560px;
  }

  .page-about__features-grid {
    gap: 2.5rem;
  }
}

/* ===== 确保卡片和图片不溢出 ===== */
.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .card {
  background: var(--about-glass-bg);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border: 1px solid var(--about-glass-border);
  border-radius: 16px;
}

/* 等宽数据值统一 */
.page-about .data-value {
  font-family: var(--font-data, 'JetBrains Mono', monospace);
  font-weight: 700;
  font-feature-settings: "tnum" on;
}

/* 悬停焦点状态 */
.page-about *:focus-visible {
  outline: 2px solid var(--color-accent-neon-purple, #B829F0);
  outline-offset: 2px;
  border-radius: 2px;
}