/* ===== 页面专属样式：解决方案（page-products） ===== */
.page-products {
  --color-card-bg: #ffffff;
  --color-card-bg-alt: #f5f0eb;
  --color-timeline-line: rgba(229, 57, 53, 0.55);
  --color-progress-track: rgba(255, 255, 255, 0.15);
  --color-progress-fill: #e53935;
  --color-badge-bg: #e53935;
  --color-badge-text: #ffffff;
  --color-feature-icon: #ffca28;
  --color-nav-bg: rgba(66, 66, 66, 0.85);
  --color-nav-border: rgba(229, 57, 53, 0.3);
  --gap-lg: 40px;
  --gap-xl: 64px;
  --timeline-dot-size: 20px;

  background-color: var(--color-bg-dark, #424242);
  color: var(--color-text-inverse, #ffffff);
  padding: 0 0 var(--gap-xl) 0;
  font-family: var(--font-body, 'Noto Sans SC', sans-serif);
  line-height: 1.6;
}

/* ---- 容器覆写 ---- */
.page-products .container {
  max-width: var(--max-width, 1280px);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--gap, 16px);
  padding-right: var(--gap, 16px);
}

/* ---- 面包屑 ---- */
.products-breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px var(--gap, 16px) 0;
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
}
.products-breadcrumb a {
  color: var(--color-secondary, #ffca28);
  text-decoration: none;
  transition: color var(--transition, 0.25s ease);
}
.products-breadcrumb a:hover,
.products-breadcrumb a:focus-visible {
  color: var(--color-primary, #e53935);
  text-decoration: underline;
}
.breadcrumb-sep {
  color: rgba(255, 255, 255, 0.35);
  font-family: var(--font-data, monospace);
}

/* ---- Hero 区 ---- */
.products-hero {
  padding: var(--gap-xl, 64px) 0 var(--gap-lg, 40px) 0;
}
.products-hero .container {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-lg, 40px);
  align-items: center;
}
.hero-title {
  font-family: var(--font-heading, 'Noto Sans SC', sans-serif);
  font-size: 40px;
  font-weight: bold;
  color: var(--color-text-inverse, #ffffff);
  margin: 0 0 16px 0;
  line-height: 1.2;
  letter-spacing: -0.02em;
  position: relative;
}
.hero-title::before {
  content: '';
  display: block;
  width: 48px;
  height: 4px;
  background: var(--color-primary, #e53935);
  margin-bottom: 16px;
}
.hero-desc {
  font-size: 18px;
  color: rgba(255, 255, 255, 0.85);
  max-width: 680px;
  margin: 0 0 24px 0;
}
.hero-link {
  display: inline-block;
  padding: 12px 28px;
  border-radius: var(--radius, 4px);
  font-weight: bold;
  font-size: 16px;
  text-decoration: none;
  transition: background var(--transition, 0.25s ease), transform var(--transition, 0.25s ease);
}
.hero-link:hover,
.hero-link:focus-visible {
  transform: translateY(-2px);
}
.hero-visual {
  width: 100%;
}
.hero-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius, 4px);
  display: block;
  object-fit: cover;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
}

/* ---- 时间线区域 ---- */
.timeline-zone {
  padding: var(--gap-lg, 40px) 0;
  position: relative;
}
.timeline-layout {
  display: flex;
  flex-direction: column;
  gap: 0;
}

/* 左侧索引导航 */
.timeline-nav {
  display: none;
}
.timeline-nav-inner {
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: sticky;
  top: calc(var(--header-height, 64px) + 20px);
}
.timeline-nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--color-nav-bg);
  border-left: 3px solid transparent;
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  font-family: var(--font-heading, 'Noto Sans SC', sans-serif);
  font-weight: bold;
  font-size: 15px;
  border-radius: 0 var(--radius, 4px) var(--radius, 4px) 0;
  transition: background var(--transition, 0.25s ease), border-color var(--transition, 0.25s ease), color var(--transition, 0.25s ease);
}
.timeline-nav-item:hover,
.timeline-nav-item:focus-visible {
  background: rgba(229, 57, 53, 0.2);
  border-left-color: var(--color-primary, #e53935);
  color: #ffffff;
}
.nav-number {
  font-family: var(--font-data, monospace);
  font-size: 18px;
  color: var(--color-primary, #e53935);
  min-width: 32px;
}
.nav-label {
  white-space: nowrap;
}

/* 右侧时间线内容 */
.timeline-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  padding-left: 0;
}

/* ---- 单个时间线项目 ---- */
.timeline-item {
  display: flex;
  gap: var(--gap, 16px);
  padding: var(--gap-lg, 40px) 0;
  position: relative;
  scroll-margin-top: calc(var(--header-height, 64px) + 20px);
}
.timeline-item:first-child {
  padding-top: 0;
}
.timeline-item:last-child {
  padding-bottom: 0;
}
.timeline-item:last-child .marker-line {
  display: none;
}

/* 左侧标记（圆点 + 竖线） */
.item-marker {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex-shrink: 0;
  width: var(--timeline-dot-size, 20px);
  position: relative;
}
.marker-dot {
  width: var(--timeline-dot-size, 20px);
  height: var(--timeline-dot-size, 20px);
  border-radius: 50%;
  background: var(--color-primary, #e53935);
  border: 3px solid var(--color-bg-dark, #424242);
  box-shadow: 0 0 0 3px var(--color-primary, #e53935);
  flex-shrink: 0;
  z-index: 2;
}
.marker-line {
  width: 2px;
  flex: 1;
  min-height: 40px;
  background: var(--color-timeline-line);
  margin-top: 4px;
}

/* 卡片 */
.item-card {
  flex: 1;
  background: var(--color-card-bg);
  color: var(--color-text-primary, #212121);
  border-radius: var(--radius, 4px);
  padding: 24px 20px;
  position: relative;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  transition: box-shadow var(--transition, 0.25s ease), transform var(--transition, 0.25s ease);
}
.item-card:hover {
  box-shadow: 0 12px 48px rgba(0, 0, 0, 0.45);
  transform: translateY(-4px);
}

/* 进度条 */
.card-progress {
  height: 4px;
  background: var(--color-progress-track);
  border-radius: 2px;
  margin-bottom: 16px;
  overflow: hidden;
}
.progress-fill {
  display: block;
  height: 100%;
  background: var(--color-progress-fill);
  border-radius: 2px;
  transition: width 0.6s ease;
}

/* 徽章 */
.card-badge {
  display: inline-block;
  background: var(--color-badge-bg);
  color: var(--color-badge-text);
  font-family: var(--font-data, monospace);
  font-size: 12px;
  font-weight: bold;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 2px;
  margin-bottom: 12px;
}
.card-badge--stable {
  background: var(--color-secondary, #ffca28);
  color: var(--color-text-primary, #212121);
}
.card-badge--review {
  background: var(--color-bg-dark, #424242);
  color: var(--color-text-inverse, #ffffff);
}

/* 卡片标题 */
.card-title {
  font-family: var(--font-heading, 'Noto Sans SC', sans-serif);
  font-size: 26px;
  font-weight: bold;
  margin: 0 0 16px 0;
  color: var(--color-text-primary, #212121);
  line-height: 1.2;
}

/* 卡片主体（图片+文字） */
.card-body {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.card-image-wrap {
  width: 100%;
  flex-shrink: 0;
}
.card-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius, 4px);
  display: block;
  object-fit: cover;
}
.card-text {
  flex: 1;
}
.card-text p {
  font-size: 16px;
  margin: 0 0 16px 0;
  line-height: 1.7;
}

/* 特点列表 */
.feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}
.feature-list li {
  font-size: 14px;
  font-weight: bold;
  color: var(--color-text-primary, #212121);
  display: flex;
  align-items: center;
  gap: 6px;
}
.feature-list li::before {
  content: '◆';
  color: var(--color-feature-icon, #ffca28);
  font-size: 10px;
}

/* ---- 订阅区 ---- */
.products-subscribe {
  padding: var(--gap-xl, 64px) 0;
  background: var(--color-bg-warm, #f5f0eb);
  color: var(--color-text-primary, #212121);
  margin-top: var(--gap-lg, 40px);
}
.products-subscribe .container {
  max-width: var(--max-width, 1280px);
}
.subscribe-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-lg, 40px);
  align-items: center;
}
.subscribe-title {
  font-family: var(--font-heading, 'Noto Sans SC', sans-serif);
  font-size: 32px;
  font-weight: bold;
  margin: 0 0 16px 0;
  line-height: 1.2;
  position: relative;
}
.subscribe-title::before {
  content: '';
  display: block;
  width: 40px;
  height: 4px;
  background: var(--color-primary, #e53935);
  margin-bottom: 12px;
}
.subscribe-desc {
  font-size: 18px;
  color: rgba(33, 33, 33, 0.8);
  margin: 0 0 24px 0;
  max-width: 600px;
}

/* 订阅交互（纯CSS） */
.subscribe-action {
  margin-bottom: 16px;
}
.sub-checkbox {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}
.sub-label {
  display: inline-block;
  cursor: pointer;
  padding: 14px 36px;
  font-family: var(--font-heading, 'Noto Sans SC', sans-serif);
  font-weight: bold;
  font-size: 18px;
  border: none;
  border-radius: var(--radius, 4px);
  background: var(--color-primary, #e53935);
  color: var(--color-text-inverse, #ffffff);
  transition: background var(--transition, 0.25s ease), transform var(--transition, 0.25s ease);
  user-select: none;
}
.sub-label:hover {
  background: var(--color-primary-dark, #c62828);
  transform: translateY(-2px);
}
.sub-label:focus-visible {
  outline: 3px solid var(--color-secondary, #ffca28);
  outline-offset: 2px;
}
.sub-checkbox:focus-visible + .sub-label {
  outline: 3px solid var(--color-secondary, #ffca28);
  outline-offset: 2px;
}

/* 反馈信息（默认隐藏，checkbox选中时显示） */
.sub-feedback {
  display: none;
  margin-top: 16px;
  padding: 12px 20px;
  background: rgba(46, 125, 50, 0.12);
  border-left: 4px solid #2e7d32;
  border-radius: var(--radius, 4px);
  font-size: 16px;
  font-weight: bold;
  color: #2e7d32;
  align-items: center;
  gap: 10px;
}
.sub-checkbox:checked ~ .sub-feedback {
  display: flex;
}
.sub-checkbox:checked ~ .sub-label {
  opacity: 0.6;
  pointer-events: none;
}
.feedback-icon {
  font-size: 20px;
  font-weight: bold;
  color: #2e7d32;
}

.subscribe-note {
  font-size: 14px;
  color: rgba(33, 33, 33, 0.5);
  margin: 0 0 12px 0;
}
.subscribe-faq {
  display: inline-block;
  color: var(--color-primary, #e53935);
  font-weight: bold;
  text-decoration: none;
  transition: color var(--transition, 0.25s ease);
}
.subscribe-faq:hover,
.subscribe-faq:focus-visible {
  color: var(--color-primary-dark, #c62828);
  text-decoration: underline;
}

.subscribe-visual {
  width: 100%;
}
.sub-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius, 4px);
  display: block;
  object-fit: cover;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
}

/* ===== 响应式：平板 / 桌面 ===== */
@media (min-width: 768px) {
  .page-products {
    --timeline-dot-size: 24px;
  }
  .hero-title {
    font-size: 48px;
  }
  .products-hero .container {
    grid-template-columns: 1fr 1fr;
  }
  .hero-visual {
    order: 2;
  }
  .hero-text {
    order: 1;
  }

  /* 时间线布局：左侧索引 + 右侧内容 */
  .timeline-layout {
    flex-direction: row;
    gap: var(--gap-lg, 40px);
  }
  .timeline-nav {
    display: block;
    width: 180px;
    flex-shrink: 0;
    padding-top: 16px;
  }
  .timeline-content {
    padding-left: 0;
    border-left: none;
  }

  /* 卡片内部水平布局 */
  .card-body {
    flex-direction: row;
  }
  .card-image-wrap {
    width: 45%;
    max-width: 280px;
  }
  .timeline-item {
    gap: 24px;
  }
  .item-card {
    padding: 28px 28px;
  }
  .card-title {
    font-size: 28px;
  }

  /* 订阅区水平布局 */
  .subscribe-layout {
    grid-template-columns: 1fr 1fr;
  }
  .subscribe-title {
    font-size: 36px;
  }
}

@media (min-width: 1024px) {
  .timeline-nav {
    width: 220px;
  }
  .hero-title {
    font-size: 56px;
  }
  .card-title {
    font-size: 32px;
  }
  .item-card {
    padding: 32px 36px;
  }
  .subscribe-title {
    font-size: 40px;
  }
}

/* ===== 辅助排版 ===== */
.page-products a:focus-visible {
  outline: 2px solid var(--color-secondary, #ffca28);
  outline-offset: 2px;
}
.page-products .btn-primary,
.page-products .btn-secondary {
  transition: background var(--transition, 0.25s ease), transform var(--transition, 0.25s ease);
}
.page-products .btn-primary:hover,
.page-products .btn-secondary:hover {
  transform: translateY(-2px);
}