/* ===== 品牌档案页专属样式 .page-about ===== */
.page-about {
  --about-hero-glow: rgba(57, 255, 20, 0.15);
  --about-tree-line: rgba(155, 89, 182, 0.35);
  --about-card-bg: rgba(15, 34, 64, 0.7);
  --about-card-border: rgba(155, 89, 182, 0.25);
  --about-intro-accent: rgba(57, 255, 20, 0.08);
  --about-step-bg: rgba(155, 89, 182, 0.12);
  --about-step-active: rgba(57, 255, 20, 0.15);
  --about-connector-w: 2px;
  --about-node-size: 56px;
  display: block;
  background: var(--color-bg, #0B1A33);
  color: var(--color-text, #E0E6ED);
  font-family: var(--font-body, 'Inter', sans-serif);
  line-height: 1.6;
  position: relative;
  z-index: 1;
}

/* ===== 容器 ===== */
.page-about .container {
  max-width: var(--max-width, 1200px);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
  width: 100%;
  box-sizing: border-box;
}

/* ===== 面包屑 ===== */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  letter-spacing: 0.03em;
  margin-bottom: 16px;
  color: var(--color-text-secondary, #8899AA);
}
.page-about .breadcrumb__item a {
  color: var(--color-accent, #9B59B6);
  text-decoration: none;
  transition: color 0.2s;
}
.page-about .breadcrumb__item a:hover,
.page-about .breadcrumb__item a:focus-visible {
  color: var(--color-signal, #39FF14);
  outline: none;
}
.page-about .breadcrumb__item--current {
  color: var(--color-signal, #39FF14);
  font-weight: 500;
}
.page-about .breadcrumb__separator {
  color: var(--color-text-secondary, #8899AA);
  opacity: 0.6;
}

/* ===== 首屏英雄区 ===== */
.page-about .about-hero {
  padding: 48px 0 40px;
  position: relative;
  overflow: hidden;
}
.page-about .about-hero::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--about-hero-glow) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}
.page-about .about-hero__inner {
  display: flex;
  flex-direction: column;
  gap: 32px;
  position: relative;
  z-index: 1;
}
.page-about .about-hero__content {
  flex: 1;
}
.page-about .about-hero__title {
  font-family: var(--font-heading, 'Montserrat', sans-serif);
  font-size: clamp(36px, 8vw, 56px);
  font-weight: 800;
  color: var(--color-text, #E0E6ED);
  margin: 0 0 8px;
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  background: linear-gradient(135deg, #E0E6ED 40%, var(--color-signal, #39FF14) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
  transform: skewX(-3deg);
  transform-origin: left center;
}
.page-about .about-hero__subtitle {
  font-family: var(--font-heading, 'Montserrat', sans-serif);
  font-size: clamp(14px, 2.5vw, 18px);
  font-weight: 600;
  color: var(--color-accent, #9B59B6);
  margin: 0 0 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.page-about .about-hero__desc {
  font-size: var(--size-body, 16px);
  color: var(--color-text-secondary, #8899AA);
  max-width: 560px;
  margin: 0;
  line-height: 1.7;
}
.page-about .about-hero__visual {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-about .about-hero__img {
  max-width: 100%;
  height: auto;
  width: 280px;
  border-radius: var(--radius-card, 16px);
  box-shadow: var(--shadow-card, 0 8px 32px rgba(0,0,0,0.6));
  border: 1px solid var(--about-card-border);
  object-fit: cover;
  aspect-ratio: 1/1;
}

/* ===== 品牌介绍区 ===== */
.page-about .about-intro {
  padding: 40px 0 48px;
  position: relative;
}
.page-about .about-intro::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  max-width: 800px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent-glow, rgba(155,89,182,0.4)), transparent);
}
.page-about .about-intro__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}
.page-about .about-intro__label {
  display: inline-block;
  font-family: var(--font-heading, 'Montserrat', sans-serif);
  font-size: var(--size-label, 14px);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-signal, #39FF14);
  margin: 0 0 16px;
  padding: 4px 16px;
  border-left: 3px solid var(--color-signal, #39FF14);
  background: var(--about-intro-accent);
}
.page-about .about-intro__body {
  font-size: var(--size-body, 16px);
  color: var(--color-text-secondary, #8899AA);
  margin: 0 0 16px;
  max-width: 680px;
  line-height: 1.75;
}
.page-about .about-intro__body:last-of-type {
  margin-bottom: 0;
}
.page-about .about-intro__values {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.page-about .value-card {
  background: var(--about-card-bg);
  border: 1px solid var(--about-card-border);
  border-radius: var(--radius-card, 16px);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.page-about .value-card:hover,
.page-about .value-card:focus-within {
  border-color: var(--color-accent, #9B59B6);
  box-shadow: var(--border-glow, 0 0 12px rgba(155,89,182,0.4));
}
.page-about .value-card__icon {
  font-size: 28px;
  line-height: 1;
  display: block;
}
.page-about .value-card__title {
  font-family: var(--font-heading, 'Montserrat', sans-serif);
  font-size: var(--size-h3, 28px);
  font-weight: 700;
  color: var(--color-text, #E0E6ED);
  margin: 0;
  line-height: 1.2;
}
.page-about .value-card__desc {
  font-size: 14px;
  color: var(--color-text-secondary, #8899AA);
  margin: 0;
  line-height: 1.5;
}

/* ===== 平台数据区（技能树） ===== */
.page-about .about-data {
  padding: 48px 0 40px;
}
.page-about .about-data__label {
  display: inline-block;
  font-family: var(--font-heading, 'Montserrat', sans-serif);
  font-size: var(--size-label, 14px);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent, #9B59B6);
  margin: 0 0 8px;
  padding: 4px 16px;
  border-left: 3px solid var(--color-accent, #9B59B6);
}
.page-about .about-data__intro {
  font-size: var(--size-body, 16px);
  color: var(--color-text-secondary, #8899AA);
  margin: 0 0 32px;
  max-width: 600px;
}
.page-about .skill-tree {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  padding-left: 0;
  margin-bottom: 36px;
}
.page-about .skill-tree__item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 16px 0;
  position: relative;
  cursor: default;
  transition: background 0.25s;
  border-radius: var(--radius-sm, 8px);
  padding-left: 12px;
  padding-right: 12px;
}
.page-about .skill-tree__item:hover,
.page-about .skill-tree__item:focus-within {
  background: var(--about-step-bg);
}
.page-about .skill-tree__item[data-hover-highlight]:hover {
  background: var(--about-step-active);
}
.page-about .skill-tree__node {
  flex-shrink: 0;
  width: var(--about-node-size);
  height: var(--about-node-size);
  border-radius: 50%;
  background: var(--about-card-bg);
  border: 2px solid var(--color-accent, #9B59B6);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 2;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.page-about .skill-tree__item:hover .skill-tree__node,
.page-about .skill-tree__item:focus-within .skill-tree__node {
  border-color: var(--color-signal, #39FF14);
  box-shadow: 0 0 16px var(--color-signal-glow, rgba(57,255,20,0.3));
}
.page-about .skill-tree__icon {
  font-size: 18px;
  line-height: 1;
  display: block;
}
.page-about .skill-tree__step {
  font-family: var(--font-heading, 'Montserrat', sans-serif);
  font-size: 10px;
  font-weight: 700;
  color: var(--color-accent, #9B59B6);
  letter-spacing: 0.05em;
  margin-top: 2px;
}
.page-about .skill-tree__content {
  flex: 1;
  min-width: 0;
  padding-top: 4px;
}
.page-about .skill-tree__title {
  font-family: var(--font-heading, 'Montserrat', sans-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text, #E0E6ED);
  margin: 0 0 4px;
  line-height: 1.3;
}
.page-about .skill-tree__desc {
  font-size: 14px;
  color: var(--color-text-secondary, #8899AA);
  margin: 0;
  line-height: 1.6;
}
.page-about .skill-tree__connector {
  position: absolute;
  left: calc(var(--about-node-size) / 2 + 12px - 1px);
  top: calc(var(--about-node-size) + 16px);
  bottom: -16px;
  width: var(--about-connector-w);
  background: var(--about-tree-line);
  z-index: 1;
  display: none;
}
.page-about .skill-tree__item:not(:last-child) .skill-tree__connector {
  display: block;
}
.page-about .about-data__visual {
  margin-top: 12px;
}
.page-about .about-data__img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-card, 16px);
  box-shadow: var(--shadow-card, 0 8px 32px rgba(0,0,0,0.6));
  border: 1px solid var(--about-card-border);
  object-fit: cover;
  width: 100%;
  aspect-ratio: 2/1;
}

/* ===== 合规说明区 ===== */
.page-about .about-compliance {
  padding: 40px 0 48px;
  position: relative;
}
.page-about .about-compliance::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  max-width: 800px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent-glow, rgba(155,89,182,0.4)), transparent);
}
.page-about .about-compliance__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  text-align: center;
}
.page-about .about-compliance__badge {
  flex-shrink: 0;
}
.page-about .about-compliance__icon {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm, 8px);
  opacity: 0.9;
  object-fit: contain;
}
.page-about .about-compliance__content {
  max-width: 600px;
}
.page-about .about-compliance__label {
  display: inline-block;
  font-family: var(--font-heading, 'Montserrat', sans-serif);
  font-size: var(--size-label, 14px);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-warning, #FFAA00);
  margin: 0 0 12px;
  padding: 4px 16px;
  border-left: 3px solid var(--color-warning, #FFAA00);
}
.page-about .about-compliance__text {
  font-size: var(--size-body, 16px);
  color: var(--color-text-secondary, #8899AA);
  margin: 0 0 12px;
  line-height: 1.7;
}
.page-about .about-compliance__text strong {
  color: var(--color-text, #E0E6ED);
  font-weight: 600;
}
.page-about .about-compliance__text:last-of-type {
  margin-bottom: 0;
}
.page-about .about-compliance__link {
  color: var(--color-accent, #9B59B6);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s, color 0.2s;
}
.page-about .about-compliance__link:hover,
.page-about .about-compliance__link:focus-visible {
  color: var(--color-signal, #39FF14);
  border-bottom-color: var(--color-signal, #39FF14);
  outline: none;
}

/* ===== 内部链接导航 ===== */
.page-about .about-links {
  padding: 16px 0 48px;
}
.page-about .about-links__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.page-about .about-links__card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  background: var(--about-card-bg);
  border: 1px solid var(--about-card-border);
  border-radius: var(--radius-sm, 8px);
  text-decoration: none;
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.2s;
  color: var(--color-text, #E0E6ED);
}
.page-about .about-links__card:hover,
.page-about .about-links__card:focus-visible {
  border-color: var(--color-accent, #9B59B6);
  box-shadow: var(--border-glow, 0 0 12px rgba(155,89,182,0.4));
  transform: translateY(-2px);
  outline: none;
}
.page-about .about-links__icon {
  font-size: 22px;
  line-height: 1;
  flex-shrink: 0;
}
.page-about .about-links__label {
  font-family: var(--font-heading, 'Montserrat', sans-serif);
  font-size: 15px;
  font-weight: 600;
  flex: 1;
}
.page-about .about-links__arrow {
  font-size: 18px;
  color: var(--color-accent, #9B59B6);
  flex-shrink: 0;
  transition: transform 0.2s;
}
.page-about .about-links__card:hover .about-links__arrow,
.page-about .about-links__card:focus-visible .about-links__arrow {
  transform: translateX(4px);
}

/* ===== 响应式：平板 768px+ ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 64px 0 56px;
  }
  .page-about .about-hero__inner {
    flex-direction: row;
    align-items: center;
    gap: 48px;
  }
  .page-about .about-hero__title {
    font-size: 52px;
  }
  .page-about .about-hero__img {
    width: 340px;
  }
  .page-about .about-intro__grid {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
  }
  .page-about .about-intro__values {
    grid-template-columns: 1fr;
  }
  .page-about .value-card {
    padding: 28px 24px;
  }
  .page-about .skill-tree {
    padding-left: 20px;
  }
  .page-about .skill-tree__item {
    padding: 20px 16px;
    gap: 28px;
  }
  .page-about .skill-tree__title {
    font-size: 22px;
  }
  .page-about .about-compliance__inner {
    flex-direction: row;
    text-align: left;
    gap: 40px;
  }
  .page-about .about-links__grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }
  .page-about .about-links__card {
    padding: 20px 16px;
    flex-direction: column;
    text-align: center;
    gap: 8px;
  }
  .page-about .about-links__arrow {
    align-self: center;
  }
}

/* ===== 响应式：桌面 1024px+ ===== */
@media (min-width: 1024px) {
  .page-about .about-hero {
    padding: 80px 0 64px;
  }
  .page-about .about-hero__title {
    font-size: 64px;
  }
  .page-about .about-hero__subtitle {
    font-size: 18px;
  }
  .page-about .about-hero__img {
    width: 400px;
  }
  .page-about .about-intro {
    padding: 56px 0 64px;
  }
  .page-about .about-intro__grid {
    gap: 64px;
  }
  .page-about .about-intro__values {
    grid-template-columns: 1fr;
  }
  .page-about .value-card {
    padding: 32px 28px;
  }
  .page-about .about-data {
    padding: 64px 0 56px;
  }
  .page-about .skill-tree__item {
    padding: 24px 20px;
  }
  .page-about .about-compliance {
    padding: 56px 0 64px;
  }
  .page-about .about-compliance__inner {
    gap: 56px;
  }
  .page-about .about-links {
    padding: 24px 0 64px;
  }
  .page-about .about-links__grid {
    gap: 20px;
  }
  .page-about .about-links__card {
    padding: 24px 20px;
  }
}

/* ===== 窄屏安全 ===== */
@media (max-width: 400px) {
  .page-about .container {
    padding-left: 12px;
    padding-right: 12px;
  }
  .page-about .about-hero__title {
    font-size: 28px;
  }
  .page-about .about-hero__img {
    width: 200px;
  }
  .page-about .skill-tree__node {
    width: 44px;
    height: 44px;
  }
  .page-about .skill-tree__icon {
    font-size: 14px;
  }
  .page-about .skill-tree__step {
    font-size: 8px;
  }
  .page-about .skill-tree__connector {
    left: calc(22px + 12px - 1px);
  }
  .page-about .about-links__grid {
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }
  .page-about .about-links__card {
    padding: 12px 10px;
    gap: 6px;
  }
  .page-about .about-links__label {
    font-size: 13px;
  }
}