/* 品牌档案页专属样式 */
.page-about {
  --about-line: rgba(255, 255, 255, 0.12);
  --about-accent-glow: 0 0 22px rgba(255, 107, 53, 0.35);
  --about-deco-gradient: radial-gradient(ellipse at 18% 0%, rgba(255, 107, 53, 0.12), transparent 42%);
}

/* ===== Hero 区 ===== */
.about-hero {
  position: relative;
  padding: var(--space-md) 0 var(--space-lg);
  overflow: hidden;
}
.about-hero::before {
  content: "";
  position: absolute;
  width: 420px;
  height: 420px;
  right: -180px;
  top: -160px;
  background: radial-gradient(circle, rgba(255, 107, 53, 0.2), transparent 65%);
  pointer-events: none;
}
.about-hero::after {
  content: "";
  position: absolute;
  width: 120px;
  height: 120px;
  right: 5%;
  bottom: 8%;
  border: 2px solid rgba(255, 107, 53, 0.24);
  transform: rotate(18deg) skew(-6deg);
  pointer-events: none;
}
.about-hero__inner {
  position: relative;
  z-index: 1;
}
.about-hero__content {
  margin-top: var(--space-md);
  max-width: 900px;
}
.about-hero__content h1 {
  font-family: var(--font-headline);
  font-size: clamp(1.9rem, 5vw, 3.4rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--c-white);
  margin: var(--space-sm) 0;
}
.about-hero__lead {
  color: var(--c-secondary);
  line-height: 1.85;
  margin: 0 0 var(--space-md);
  max-width: 720px;
}
.about-hero__stats {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
.about-hero__stat {
  padding: 1.25rem;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--about-line);
  border-radius: calc(var(--radius) - 2px);
  background: linear-gradient(135deg, var(--c-glass-light), rgba(255, 255, 255, 0.03));
  transition: border-color 0.3s var(--transition), transform 0.3s var(--transition);
}
.about-hero__stat:hover {
  border-color: rgba(255, 107, 53, 0.4);
  transform: translateY(-3px);
}
.about-hero__stat::after {
  content: "";
  position: absolute;
  right: 14px;
  bottom: 12px;
  width: 34px;
  height: 34px;
  border: 2px solid rgba(255, 107, 53, 0.3);
  transform: rotate(45deg);
  border-radius: 5px;
  pointer-events: none;
}
.about-hero__stat-num {
  display: block;
  font-family: var(--font-headline);
  font-size: 1.9rem;
  line-height: 1.1;
  color: var(--c-accent);
  margin-bottom: 0.375rem;
}
.about-hero__stat-label {
  font-size: 0.85rem;
  color: var(--c-secondary);
}

/* ===== 章节目录导航 ===== */
.about-chapters {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.02);
  padding: 0.875rem 0;
  position: relative;
  z-index: 1;
}
.about-chapters__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  justify-content: flex-start;
}
.about-chapters__list a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--c-secondary);
  font-size: 0.9rem;
  text-decoration: none;
  padding: 0.375rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.3s var(--transition), border-color 0.3s var(--transition);
}
.about-chapters__list a:hover {
  color: var(--c-white);
  border-bottom-color: var(--c-accent);
}
.about-chapters__list a span {
  font-family: var(--font-headline);
  color: var(--c-accent);
  font-size: 0.8rem;
}

/* ===== 章节通用结构 ===== */
.about-section {
  position: relative;
  padding: var(--space-lg) 0;
  scroll-margin-top: calc(var(--header-height) + 24px);
}
.about-section-head {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  margin-bottom: var(--space-md);
  position: relative;
}
.about-section-head .section-number {
  font-family: var(--font-headline);
  font-size: clamp(2.5rem, 6vw, 4rem);
  line-height: 0.9;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--c-accent);
  flex-shrink: 0;
}
.about-section-head .section-title {
  margin: 0;
}
.about-section-sub {
  color: var(--c-secondary);
  margin: 0.375rem 0 0;
  font-size: 1rem;
}

/* ===== 01 品牌故事 ===== */
.about-story__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}
.about-story__text p {
  color: rgba(255, 255, 255, 0.82);
  line-height: 1.9;
  margin-bottom: 1rem;
  font-size: 0.98rem;
}
.about-story__media {
  margin: 0;
  position: relative;
}
.about-story__media .img-frame {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
}
.about-story__media figcaption {
  margin-top: 0.75rem;
  color: var(--c-secondary);
  font-size: 0.875rem;
}

/* ===== 02 发展历程 ===== */
.about-journey__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}
.about-journey__timeline {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.about-timeline__item {
  position: relative;
  padding-left: 1.75rem;
}
.about-timeline__item::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 0;
  bottom: -1.25rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--c-accent), rgba(255, 107, 53, 0.12));
}
.about-timeline__item:last-child::before {
  display: none;
}
.about-timeline__marker {
  position: absolute;
  left: 0;
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--c-accent);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.14), var(--about-accent-glow);
  z-index: 1;
}
.about-timeline__card {
  padding: 1.25rem;
}
.about-timeline__card h3 {
  margin: 0.5rem 0 0.375rem;
  font-size: 1.15rem;
  color: var(--c-white);
}
.about-timeline__card p {
  color: var(--c-secondary);
  line-height: 1.7;
  font-size: 0.95rem;
  margin: 0;
}
.about-journey__media {
  display: flex;
  align-items: stretch;
}
.about-journey__figure {
  margin: 0;
  width: 100%;
}
.about-journey__figure .img-frame {
  height: 100%;
}
.about-journey__figure figcaption {
  margin-top: 0.625rem;
  color: var(--c-secondary);
  font-size: 0.875rem;
  text-align: right;
}

/* ===== 03 版本迭代记录 ===== */
.about-version {
  background: var(--about-deco-gradient);
}
.about-version .container {
  position: relative;
  z-index: 1;
}
.about-version__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}
.about-version__intro p {
  color: rgba(255, 255, 255, 0.82);
  line-height: 1.8;
  margin-bottom: 1.25rem;
  font-size: 0.98rem;
}
.about-version__img + .about-version__journal-link {
  margin-top: 1.25rem;
}
.about-version__journal-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.25rem;
  color: var(--c-accent);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid rgba(255, 107, 53, 0.35);
  padding-bottom: 0.25rem;
  transition: border-color 0.3s var(--transition), color 0.3s var(--transition);
}
.about-version__journal-link:hover {
  border-bottom-color: var(--c-accent);
  color: var(--c-accent-pale);
}
.about-version__list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.about-version__item {
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--c-accent);
  border-radius: var(--radius);
  transition: background 0.3s var(--transition), border-color 0.3s var(--transition);
}
.about-version__item[open] {
  background: var(--c-glass-medium);
}
.about-version__item summary {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem;
  cursor: pointer;
  list-style: none;
}
.about-version__item summary::-webkit-details-marker {
  display: none;
}
.about-version__item summary::after {
  content: "+";
  margin-left: auto;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-accent);
  transition: transform 0.3s var(--transition);
  flex-shrink: 0;
}
.about-version__item[open] summary::after {
  transform: rotate(45deg);
}
.about-version__item-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--c-accent);
  color: var(--c-accent);
  font-family: var(--font-headline);
  font-size: 0.85rem;
  border-radius: 8px;
  flex-shrink: 0;
}
.about-version__item-copy {
  min-width: 0;
  flex: 1;
}
.about-version__item-copy h3 {
  font-size: 1.05rem;
  color: var(--c-white);
  margin: 0 0 0.25rem;
}
.about-version__item-tag {
  display: block;
  font-size: 0.8rem;
  color: var(--c-warning);
  letter-spacing: 0.08em;
}
.about-version__item-body {
  padding: 0 1.25rem 1.25rem 3.5rem;
  color: var(--c-secondary);
  line-height: 1.7;
  font-size: 0.95rem;
}

/* ===== 04 核心能力 ===== */
.about-capability__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
.about-capability__card {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.about-capability__icon {
  display: inline-flex;
  width: 56px;
  height: 56px;
  align-items: center;
  justify-content: center;
  background: rgba(255, 107, 53, 0.12);
  border-radius: 12px;
  margin-bottom: 0.25rem;
  color: var(--c-accent);
}
.about-capability__card h3 {
  font-size: 1.3rem;
  line-height: 1.3;
  margin: 0;
  color: var(--c-white);
}
.about-capability__card p {
  color: var(--c-secondary);
  line-height: 1.7;
  font-size: 0.95rem;
  margin: 0;
  flex-grow: 1;
}
.about-capability__card .btn {
  align-self: flex-start;
}

/* ===== 05 注册与服务体系 ===== */
.about-register__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}
.about-register__info h3 {
  font-size: 1.5rem;
  margin-top: 0;
  margin-bottom: 0.75rem;
  color: var(--c-white);
}
.about-register__info > p {
  color: rgba(255, 255, 255, 0.82);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}
.about-register__list {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-md);
  display: grid;
  gap: 0.75rem;
}
.about-register__list li {
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
  color: rgba(255, 255, 255, 0.82);
  line-height: 1.6;
}
.about-register__list li::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--c-accent);
  border-radius: 2px;
  margin-top: 0.5rem;
  flex-shrink: 0;
}
.about-register__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}
.about-register__support {
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
}
.about-register__support::after {
  content: "";
  position: absolute;
  top: -30px;
  right: -30px;
  width: 96px;
  height: 96px;
  background: rgba(255, 107, 53, 0.14);
  transform: rotate(45deg);
  border-radius: 8px;
  pointer-events: none;
}
.about-register__support p {
  color: rgba(255, 255, 255, 0.82);
  line-height: 1.8;
  position: relative;
  z-index: 1;
}
.about-register__support ul {
  list-style: none;
  padding: 0;
  margin: 0;
  position: relative;
  z-index: 1;
}
.about-register__support li {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  color: var(--c-secondary);
  padding: 0.375rem 0;
  line-height: 1.6;
}
.about-register__support li::before {
  content: "✓";
  color: var(--c-success);
  font-weight: 700;
  flex-shrink: 0;
}

/* ===== 响应式布局：平板与桌面 ===== */
@media (min-width: 768px) {
  .about-hero__stats {
    grid-template-columns: repeat(3, 1fr);
  }
  .about-story__grid {
    grid-template-columns: 1.1fr 1fr;
    align-items: center;
    gap: var(--space-lg);
  }
  .about-capability__grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .about-register__layout {
    grid-template-columns: 1.1fr 1fr;
    align-items: center;
    gap: var(--space-lg);
  }
}
@media (min-width: 1024px) {
  .about-journey__layout {
    grid-template-columns: 1.1fr 0.9fr;
    gap: var(--space-lg);
    align-items: start;
  }
  .about-journey__media {
    position: sticky;
    top: calc(var(--header-height) + 32px);
  }
  .about-version__grid {
    grid-template-columns: 0.8fr 1.2fr;
    gap: var(--space-lg);
    align-items: start;
  }
  .about-section {
    padding: var(--space-xl) 0;
  }
}