/* ===== 品牌概况页专属样式 ===== */
.page-about {
  --about-bg-start: #0A3D62;
  --about-bg-end: #1E90FF;
  --about-sidebar-width: 280px;
  --about-gap: 2rem;
  --about-card-radius: var(--radius-xl, 24px);
  --about-card-shadow: var(--shadow-md, 0 4px 20px rgba(0,0,0,0.08));
  --about-card-shadow-hover: var(--shadow-lg, 0 8px 40px rgba(0,0,0,0.12));
  --about-title-color: var(--color-primary-orange, #FF6B35);
  --about-text-color: var(--color-text-dark, #1A1A1A);
  --about-card-bg: #ffffff;

  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  padding: 1.5rem 1.25rem;
  background: linear-gradient(145deg, var(--about-bg-start), var(--about-bg-end));
  min-height: 70vh;
  border-radius: 0 0 var(--radius-lg, 12px) var(--radius-lg, 12px);
}

/* ===== 左栏 — 侧边目录 ===== */
.about-sidebar {
  background: rgba(255, 255, 255, 0.10);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border-radius: var(--about-card-radius);
  padding: 1.75rem 1.5rem;
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
  color: var(--color-text-light, #FFFFFF);
  order: 1;
}

.about-sidebar__title {
  font-family: var(--font-heading, 'PingFang SC', 'Noto Sans SC', sans-serif);
  font-weight: 900;
  font-size: 1.75rem;
  line-height: 1.2;
  margin: 0 0 0.5rem 0;
  color: var(--about-title-color);
  letter-spacing: 0.02em;
}

.about-sidebar__divider {
  display: block;
  width: 48px;
  height: 4px;
  background: var(--about-title-color);
  border-radius: var(--radius-full, 9999px);
  margin-bottom: 1.25rem;
  opacity: 0.7;
}

.about-sidebar__nav {
  margin: 0;
}

.about-sidebar__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.about-sidebar__item {
  margin: 0;
  padding: 0;
}

.about-sidebar__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body, 'PingFang SC', 'Noto Sans SC', sans-serif);
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-text-light, #FFFFFF);
  text-decoration: none;
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-md, 12px);
  transition: background var(--transition-fast, 0.18s), color var(--transition-fast, 0.18s), transform var(--transition-fast, 0.18s);
  position: relative;
}

.about-sidebar__link::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--about-title-color);
  border-radius: 50%;
  flex-shrink: 0;
  transition: transform var(--transition-fast, 0.18s);
}

.about-sidebar__link:hover,
.about-sidebar__link:focus-visible {
  background: rgba(255, 107, 53, 0.25);
  color: var(--about-title-color);
  transform: translateX(4px);
  outline: none;
}

.about-sidebar__link:hover::before,
.about-sidebar__link:focus-visible::before {
  transform: scale(1.3);
}

.about-sidebar__hint {
  font-size: 0.75rem;
  opacity: 0.6;
  margin: 1rem 0 0 0;
  font-family: var(--font-body, 'PingFang SC', 'Noto Sans SC', sans-serif);
  letter-spacing: 0.04em;
}

/* ===== 右栏 — 内容卡片区 ===== */
.about-content {
  display: flex;
  flex-direction: column;
  gap: var(--about-gap);
  order: 2;
}

/* ===== 通用卡片样式 ===== */
.about-card {
  background: var(--about-card-bg);
  border-radius: var(--about-card-radius);
  box-shadow: var(--about-card-shadow);
  overflow: hidden;
  transition: transform var(--transition-base, 0.28s), box-shadow var(--transition-base, 0.28s);
  display: flex;
  flex-direction: column;
}

.about-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--about-card-shadow-hover);
}

.about-card__body {
  padding: 1.5rem 1.5rem 1.75rem;
  flex: 1;
}

.about-card__title {
  font-family: var(--font-heading, 'PingFang SC', 'Noto Sans SC', sans-serif);
  font-weight: 800;
  font-size: 1.5rem;
  line-height: 1.3;
  color: var(--about-title-color);
  margin: 0 0 0.75rem 0;
}

.about-card__text {
  font-family: var(--font-body, 'PingFang SC', 'Noto Sans SC', sans-serif);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--about-text-color);
  margin: 0 0 1rem 0;
  max-width: 65ch;
}

.about-card__list {
  list-style: none;
  margin: 0 0 1.25rem 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.about-card__list li {
  font-family: var(--font-body, 'PingFang SC', 'Noto Sans SC', sans-serif);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--about-text-color);
  padding-left: 1.5rem;
  position: relative;
}

.about-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 10px;
  height: 10px;
  background: var(--about-title-color);
  border-radius: 2px;
  transform: rotate(45deg);
  opacity: 0.6;
}

.about-card__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  margin-top: 0.5rem;
}

.about-card__link {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-body, 'PingFang SC', 'Noto Sans SC', sans-serif);
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--color-primary-blue, #1E90FF);
  text-decoration: none;
  padding: 0.375rem 0;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast, 0.18s), border-color var(--transition-fast, 0.18s);
}

.about-card__link::after {
  content: "→";
  display: inline-block;
  margin-left: 0.375rem;
  transition: transform var(--transition-fast, 0.18s);
}

.about-card__link:hover,
.about-card__link:focus-visible {
  color: var(--about-title-color);
  border-bottom-color: var(--about-title-color);
  outline: none;
}

.about-card__link:hover::after,
.about-card__link:focus-visible::after {
  transform: translateX(3px);
}

/* ===== 卡片1 — 品牌简介 ===== */
.about-card--intro {
  flex-direction: column;
}

.about-card__img-main {
  width: 100%;
  height: auto;
  max-height: 380px;
  object-fit: cover;
  object-position: center 30%;
  display: block;
  aspect-ratio: 800 / 500;
}

/* ===== 卡片2 — 核心优势 ===== */
.about-card--advantages {
  flex-direction: column;
}

.about-card__img-side {
  width: 100%;
  height: auto;
  max-height: 260px;
  object-fit: cover;
  object-position: center;
  display: block;
  aspect-ratio: 600 / 400;
  border-top: 1px solid rgba(0,0,0,0.04);
}

/* ===== 卡片3 — 用户反馈与改进 ===== */
.about-card--feedback {
  flex-direction: column;
  position: relative;
}

.about-card__img-bg {
  width: 100%;
  height: auto;
  max-height: 200px;
  object-fit: contain;
  object-position: right bottom;
  display: block;
  aspect-ratio: 400 / 300;
  opacity: 0.20;
  margin-top: 0;
  pointer-events: none;
  align-self: flex-end;
}

/* ===== 桌面端 ≥ 768px ===== */
@media (min-width: 768px) {
  .page-about {
    grid-template-columns: var(--about-sidebar-width) 1fr;
    padding: 2.5rem 2rem;
    gap: 2.5rem;
  }

  .about-sidebar {
    position: sticky;
    top: calc(var(--header-height, 68px) + 2rem);
    align-self: start;
    padding: 2rem 1.75rem;
    order: unset;
  }

  .about-sidebar__title {
    font-size: 2rem;
  }

  .about-sidebar__list {
    gap: 0.5rem;
  }

  .about-sidebar__link {
    font-size: 1.0625rem;
    padding: 0.5rem 0.75rem;
  }

  .about-content {
    order: unset;
    gap: 2.25rem;
  }

  .about-card__body {
    padding: 2rem 2rem 2.25rem;
  }

  .about-card__title {
    font-size: 1.75rem;
  }

  .about-card__img-main {
    max-height: 420px;
  }

  .about-card--advantages {
    flex-direction: row;
    align-items: flex-start;
  }

  .about-card--advantages .about-card__body {
    flex: 1;
    padding-right: 1rem;
  }

  .about-card__img-side {
    width: 260px;
    min-width: 200px;
    max-height: none;
    align-self: stretch;
    object-fit: cover;
    border-top: none;
    border-left: 1px solid rgba(0,0,0,0.04);
    aspect-ratio: auto;
  }

  .about-card--feedback {
    flex-direction: row;
    align-items: center;
  }

  .about-card--feedback .about-card__body {
    flex: 1;
    padding-right: 1rem;
  }

  .about-card__img-bg {
    width: 180px;
    max-height: 160px;
    opacity: 0.35;
    align-self: center;
    margin-right: 1rem;
    flex-shrink: 0;
  }
}

/* ===== 大桌面 ≥ 1024px ===== */
@media (min-width: 1024px) {
  .page-about {
    padding: 3rem 2.5rem;
    gap: 3rem;
  }

  .about-sidebar {
    padding: 2.5rem 2rem;
  }

  .about-sidebar__title {
    font-size: 2.25rem;
  }

  .about-card__body {
    padding: 2.25rem 2.5rem 2.5rem;
  }

  .about-card__img-main {
    max-height: 480px;
  }

  .about-card__img-side {
    width: 300px;
  }

  .about-card__img-bg {
    width: 220px;
    max-height: 180px;
  }
}

/* ===== 极窄屏安全 ===== */
@media (max-width: 380px) {
  .page-about {
    padding: 1rem 0.75rem;
    gap: 1.25rem;
  }

  .about-sidebar {
    padding: 1.25rem 1rem;
  }

  .about-sidebar__title {
    font-size: 1.5rem;
  }

  .about-card__body {
    padding: 1.25rem 1rem 1.5rem;
  }

  .about-card__title {
    font-size: 1.25rem;
  }

  .about-card__links {
    flex-direction: column;
    gap: 0.5rem;
  }
}