/* ================================================================
   π科技 Frontend Theme — 基于 hermes-theme.css 变量
   前台专属样式，不冲突后台 admin 类名（统一加 fr- 前缀）
   ================================================================ */

/* --- Shell：顶栏 + 内容 + 页脚 三段固定 --- */
.fr-shell {
  position: relative;
  z-index: 100;
  display: flex;
  flex-direction: column;
  height: 100dvh;
  overflow: hidden;
}

/* --- 顶栏（固定不滚动） --- */
.fr-header {
  flex-shrink: 0;
  position: relative;
  z-index: 10;
  background: transparent;
  border-bottom: 1px solid var(--border-subtle);
  padding: 0 32px;
}

.fr-header-inner {
  display: flex;
  align-items: center;
  gap: 32px;
  height: 56px;
  max-width: 1200px;
  margin: 0 auto;
}

.fr-logo {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.fr-logo:hover { color: var(--color-primary); }
.fr-logo-img { height: 2rem; vertical-align: middle; }

.fr-nav {
  display: flex;
  gap: 24px;
  flex: 1;
}
.fr-nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 24px;
}
.fr-nav-list li {
  display: inline;
}
.fr-nav-list a {
  color: var(--text-primary);
  font-size: 0.88rem;
  text-decoration: none;
  transition: color 0.15s;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
}
.fr-nav-list a:hover,
.fr-nav-list a.active {
  color: var(--text-primary);
  border-bottom-color: var(--color-primary);
}

/* --- 主内容区（可滚动） --- */
.fr-main {
  flex: 1;
  overflow-y: auto;
  position: relative;
  z-index: 1;
}

.fr-main-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px;
}

/* --- 页脚（固定不滚动） --- */
.fr-footer {
  flex-shrink: 0;
  background: transparent;
  border-top: 1px solid var(--border-subtle);
  padding: 20px 32px;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-primary);
}

/* --- 卡片网格 --- */
.fr-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

/* --- 文章卡片 --- */
.fr-card {
  background: rgba(255, 230, 203, 0.02);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.15s;
  display: flex;
  flex-direction: column;
}
.fr-card:hover {
  border-color: var(--card-hover-border);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  transform: translateY(-2px);
}

.fr-card-image {
  width: 100%;
  height: 180px;
  object-fit: cover;
  display: block;
  background: rgba(255, 230, 203, 0.03);
}

.fr-card-body {
  padding: 16px 20px 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.fr-card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.5;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-decoration: none;
}
.fr-card-title:hover { color: var(--color-primary); }

.fr-card-desc {
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--text-primary);
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.fr-card-meta {
  font-size: 0.8rem;
  color: var(--text-primary);
  margin-top: auto;
  display: flex;
  gap: 12px;
}

/* --- 详情页 --- */
.fr-article {
  max-width: 800px;
  margin: 0 auto;
}
.fr-article h1 {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 12px;
  color: var(--text-primary);
}
.fr-article-meta {
  font-size: 0.85rem;
  color: var(--text-primary);
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
}
.fr-article-image {
  width: 100%;
  max-height: 420px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-bottom: 24px;
}
.fr-article-body {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text-primary);
}
.fr-article-body p {
  margin-bottom: 1.2em;
}
.fr-article-body code {
  font-family: var(--font-mono);
  background: rgba(255, 230, 203, 0.06);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}
.fr-article-body pre {
  background: rgba(0, 0, 0, 0.3);
  padding: 16px 20px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: 1.2em;
}

/* --- 列表行 --- */
.fr-row {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-subtle);
}
.fr-row:last-child { border-bottom: none; }
.fr-row-content { flex: 1; }
.fr-row-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
  display: block;
}
.fr-row-title:hover { color: var(--color-primary); }
.fr-row-meta {
  font-size: 0.8rem;
  color: var(--text-primary);
}

/* --- 面包屑 --- */
.fr-breadcrumb {
  font-size: 0.82rem;
  color: var(--text-primary);
  margin-bottom: 20px;
}
.fr-breadcrumb a { color: var(--text-primary); }
.fr-breadcrumb a:hover { color: var(--color-primary); }
.fr-breadcrumb span { color: var(--text-primary); margin: 0 6px; }

/* --- 分类标题 --- */
.fr-section-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 4px;
}
.fr-section-count {
  font-size: 0.85rem;
  color: var(--text-primary);
  margin-bottom: 20px;
}

/* 分类卡片链接 */
.fr-card-link {
  text-decoration: none;
  padding: 20px;
  display: block;
}
.fr-card-link:hover { border-color: var(--card-hover-border); }

/* 分类名 */
.fr-cat-name {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

/* 详情页内图片 */
.fr-article-img {
  max-width: 100%;
  border-radius: 8px;
  margin: 16px 0;
}

/* 内容窄版 */
.fr-content-narrow {
  max-width: 700px;
}

/* --- 空状态跨列 */
.empty-state--full {
  grid-column: 1 / -1;
}

/* ================================================================
   琰琰讲AI 专栏样式
   ================================================================ */
.fr-column-header {
  margin-bottom: 28px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
}

.fr-column-brand {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 16px;
}

.fr-column-avatar {
  flex-shrink: 0;
  width: 64px;
  height: 64px;
}

.fr-column-avatar-svg {
  width: 100%;
  height: 100%;
  display: block;
  filter: drop-shadow(0 0 8px rgba(196, 30, 30, 0.15));
}

.fr-column-info {
  flex: 1;
}

.fr-column-title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 4px;
  line-height: 1.3;
}

.fr-column-subtitle {
  font-size: 0.95rem;
  color: var(--text-primary);
  margin: 0 0 4px;
  line-height: 1.4;
}

.fr-column-byline {
  font-size: 0.82rem;
  color: var(--color-primary);
  margin: 0;
}

.fr-column-byline strong {
  font-weight: 700;
}

.fr-column-desc {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text-primary);
  margin: 0;
  max-width: 680px;
}

.fr-column-count {
  font-size: 0.85rem;
  color: var(--text-primary);
  margin-bottom: 16px;
}

/* --- 响应式 --- */
@media (max-width: 768px) {
  .fr-header { padding: 0 16px; }
  .fr-header-inner { gap: 16px; }
  .fr-nav { gap: 12px; }
  .fr-main-inner { padding: 16px; }
  .fr-grid { grid-template-columns: 1fr; }
  .fr-article h1 { font-size: 1.5rem; }
}

/* --- 顶栏右侧（登录/注册） --- */
.fr-header-right {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
}

/* --- 首页英雄区（晨报） --- */
.fr-hero {
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 32px 36px;
  margin-bottom: 36px;
  background: linear-gradient(135deg, rgba(255, 189, 56, 0.06) 0%, rgba(255, 189, 56, 0.02) 100%);
  box-shadow: 0 0 24px rgba(255, 189, 56, 0.06);
  position: relative;
}
.fr-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
  opacity: 0.5;
}
.fr-hero-label {
  font-size: 0.82rem;
  color: var(--color-primary);
  margin-bottom: 8px;
  letter-spacing: 0.05em;
  font-weight: 600;
}
.fr-hero-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.5;
  color: var(--text-primary);
}
.fr-hero-list {
  margin-bottom: 20px;
}
.fr-hero-point {
  font-size: 0.92rem;
  color: var(--text-primary);
  line-height: 1.7;
  padding: 4px 0;
  padding-left: 4px;
}
.fr-hero-point:not(:last-child) {
  border-bottom: 1px solid rgba(255, 189, 56, 0.08);
  margin-bottom: 4px;
  padding-bottom: 8px;
}
.fr-hero-btn {
  margin-top: 4px;
}

/* --- 首页轮播图（全宽） --- */
.fr-carousel {
  position: relative;
  overflow: hidden;
  margin: -32px -32px 32px;
  height: 360px;
  background: var(--bg-surface);
}
@media (max-width: 768px) {
  .fr-carousel {
    margin: -16px -16px 24px;
    height: 200px;
  }
}

.fr-carousel-track {
  display: flex;
  height: 100%;
  transition: transform 0.5s ease-in-out;
}

.fr-carousel-slide {
  flex: 0 0 100%;
  height: 100%;
  position: relative;
}

.fr-carousel-link {
  display: block;
  width: 100%;
  height: 100%;
  text-decoration: none;
}

.fr-carousel-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.fr-carousel-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--text-primary);
}

.fr-carousel-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(0,0,0,0.85));
  padding: 60px 40px 30px;
}
.fr-carousel-overlay-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.fr-carousel-overlay-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
  margin: 0;
  text-shadow: 0 1px 4px rgba(0,0,0,0.5);
}

/* 箭头 */
.fr-carousel-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: rgba(0,0,0,0.4);
  color: #fff;
  font-size: 1.6rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.25s;
  line-height: 1;
}
.fr-carousel:hover .fr-carousel-arrow {
  opacity: 0.8;
}
.fr-carousel-arrow:hover {
  opacity: 1 !important;
}
.fr-carousel-arrow--prev { left: 16px; }
.fr-carousel-arrow--next { right: 16px; }

/* 指示器 */
.fr-carousel-dots {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 10;
}
.fr-carousel-dot {
  width: 8px;
  height: 8px;
  border: none;
  border-radius: 50%;
  background: rgba(255,255,255,0.45);
  cursor: pointer;
  transition: background 0.2s;
  padding: 0;
}
.fr-carousel-dot.active {
  background: #fff;
}
/* --- 区块标题 --- */
.fr-section-subtitle {
  font-size: 0.85rem;
  color: var(--text-primary);
  margin-bottom: 20px;
}

/* --- 分类网格 --- */
.fr-cat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
  margin-bottom: 36px;
}
.fr-cat-card {
  display: block;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 20px;
  text-decoration: none;
  transition: border-color 0.2s;
}
.fr-cat-card:hover {
  border-color: var(--card-hover-border);
}
.fr-cat-name {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text-primary);
}
.fr-cat-count {
  font-size: 0.8rem;
  color: var(--text-primary);
}
/* fr-hero-desc restored */
.fr-hero-desc {
  font-size: 0.9rem;
  color: var(--text-primary);
  line-height: 1.7;
  margin-bottom: 16px;
}