/* ===== CSS Variables & Design Tokens ===== */
:root {
  /* Colors - Light Mode */
  --bg-body: #f8fafc;
  --bg-card: #ffffff;
  --bg-header: rgba(255, 255, 255, 0.85);
  --bg-hover: #f1f5f9;
  --bg-admin: #f1f5f9;
  --bg-input: #ffffff;
  --bg-modal: #ffffff;

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-inverse: #ffffff;

  --border-color: #e2e8f0;
  --border-light: #f1f5f9;

  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --primary-light: #dbeafe;
  --primary-glow: rgba(59, 130, 246, 0.15);

  --success: #10b981;
  --success-light: #d1fae5;
  --warning: #f59e0b;
  --warning-light: #fef3c7;
  --danger: #ef4444;
  --danger-light: #fee2e2;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 0 40px rgba(59, 130, 246, 0.12);

  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
  --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);

  /* Sidebar admin */
  --sidebar-bg: #1e293b;
  --sidebar-text: #94a3b8;
  --sidebar-active: #3b82f6;
}

/* Dark Mode */
.dark {
  --bg-body: #0f172a;
  --bg-card: #1e293b;
  --bg-header: rgba(15, 23, 42, 0.85);
  --bg-hover: #334155;
  --bg-admin: #0f172a;
  --bg-input: #1e293b;
  --bg-modal: #1e293b;

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0f172a;

  --border-color: #334155;
  --border-light: #1e293b;

  --primary: #60a5fa;
  --primary-dark: #3b82f6;
  --primary-light: rgba(96, 165, 250, 0.15);
  --primary-glow: rgba(96, 165, 250, 0.1);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 40px rgba(96, 165, 250, 0.08);

  --sidebar-bg: #020617;
  --sidebar-text: #64748b;
  --sidebar-active: #60a5fa;
}

/* ===== Base Reset ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background var(--transition-smooth), color var(--transition-smooth);
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* ===== Utilities ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.container-narrow {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 24px;
}

.hidden { display: none !important; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-1 { gap: 4px; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.gap-4 { gap: 16px; }
.gap-6 { gap: 24px; }
.w-full { width: 100%; }
.h-full { height: 100%; }
.text-center { text-align: center; }

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--bg-header);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition-smooth), border-color var(--transition-smooth);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--primary);
  color: white;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-icon svg {
  width: 20px;
  height: 20px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Theme Toggle */
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  background: var(--bg-hover);
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.btn-primary {
  background: var(--primary);
  color: white;
  box-shadow: 0 2px 8px var(--primary-glow);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}

.btn-secondary {
  background: var(--bg-hover);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--border-color);
}

.btn-danger {
  background: var(--danger);
  color: white;
}

.btn-danger:hover {
  background: #dc2626;
}

.btn-success {
  background: var(--success);
  color: white;
}

.btn-success:hover {
  background: #059669;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.875rem;
}

.btn-icon {
  padding: 8px;
  min-width: 36px;
  min-height: 36px;
}

/* ===== Hero Section ===== */
.hero {
  padding: 140px 0 80px;
  background: linear-gradient(180deg, var(--primary-light) 0%, var(--bg-body) 100%);
  transition: background var(--transition-smooth);
}

.hero-title {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

/* Search Box */
.search-box {
  position: relative;
  max-width: 640px;
  margin: 0 auto 48px;
}

.search-input {
  width: 100%;
  padding: 16px 56px 16px 52px;
  font-size: 1rem;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  color: var(--text-primary);
  transition: all var(--transition-fast);
  outline: none;
}

.search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-glow);
}

.search-input::placeholder {
  color: var(--text-muted);
}

.search-icon {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  width: 20px;
  height: 20px;
}

.search-icon svg {
  width: 20px;
  height: 20px;
}

.search-btn {
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  padding: 10px 20px;
}

.search-suggestions {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  z-index: 50;
}

.suggestion-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  cursor: pointer;
  transition: background var(--transition-fast);
  color: var(--text-primary);
  font-size: 0.9375rem;
}

.suggestion-item:hover {
  background: var(--bg-hover);
}

.suggestion-item svg {
  width: 16px;
  height: 16px;
  color: var(--text-muted);
  flex-shrink: 0;
}

/* ===== Section Styles ===== */
.section {
  padding: 64px 0;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 8px;
  text-align: center;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 40px;
}

/* ===== Category Cards ===== */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.category-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition-base);
  cursor: pointer;
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.category-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.category-icon svg {
  width: 24px;
  height: 24px;
}

.category-name {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.category-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
  line-height: 1.5;
}

.category-count {
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Icon colors */
.icon-blue { background: var(--primary-light); color: var(--primary); }
.icon-green { background: var(--success-light); color: var(--success); }
.icon-orange { background: var(--warning-light); color: var(--warning); }
.icon-red { background: var(--danger-light); color: var(--danger); }

/* ===== Article Cards ===== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 20px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
}

.article-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.article-image {
  width: 100%;
  height: 180px;
  object-fit: cover;
  background: var(--bg-hover);
}

.article-body {
  padding: 20px;
}

.article-category-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: var(--primary-light);
  color: var(--primary);
  margin-bottom: 10px;
}

.article-title {
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.article-excerpt {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 14px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.article-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.article-meta svg {
  width: 14px;
  height: 14px;
}

/* ===== Article Detail ===== */
.article-hero {
  padding: 120px 0 40px;
  background: linear-gradient(180deg, var(--primary-light) 0%, var(--bg-body) 100%);
}

.article-hero-search {
  margin-top: 24px;
}

.article-hero-search .search-box {
  margin-bottom: 0;
}

/* Article Path Bar */
.article-path-bar {
  padding: 16px 0 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.article-path-bar .container {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.article-path-bar a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.article-path-bar a:hover {
  color: var(--primary);
}

.path-arrow {
  width: 14px;
  height: 14px;
  color: var(--text-muted);
  flex-shrink: 0;
}

.path-current {
  color: var(--text-primary);
  font-weight: 600;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.breadcrumb a:hover {
  color: var(--primary);
}

.breadcrumb-sep {
  color: var(--text-muted);
}

.article-header-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
}

.article-header-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.9375rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
}

.article-header-meta span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.article-header-meta svg {
  width: 16px;
  height: 16px;
  color: var(--text-muted);
}

.article-content {
  padding: 40px 0 80px;
}

.article-layout {
  display: flex;
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.article-sidebar-nav {
  width: 260px;
  flex-shrink: 0;
}

.article-sidebar-inner {
  position: sticky;
  top: 100px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.article-sidebar-title {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.article-sidebar-list {
  list-style: none;
}

.article-sidebar-list li {
  margin-bottom: 2px;
}

.article-sidebar-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.article-sidebar-list a:hover,
.article-sidebar-list a.active {
  background: var(--primary-light);
  color: var(--primary);
}

.article-sidebar-list a .count {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background: var(--bg-hover);
  color: var(--text-muted);
}

.article-sidebar-list a.active .count,
.article-sidebar-list a:hover .count {
  background: var(--primary);
  color: white;
}

/* Sidebar Search */
/* Sidebar Category Tree */
.article-sidebar-tree {
}

.sidebar-category {
  margin-bottom: 4px;
}

.sidebar-category-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.sidebar-category-header:hover {
  background: var(--bg-hover);
}

.sidebar-category-header.active {
  background: var(--primary-light);
  color: var(--primary);
}

.category-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.sidebar-category-header.active .category-toggle {
  color: var(--primary);
}

.category-name {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-category-header .count {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background: var(--bg-hover);
  color: var(--text-muted);
  flex-shrink: 0;
}

.sidebar-category-header.active .count,
.sidebar-category-header:hover .count {
  background: var(--primary);
  color: white;
}

.sidebar-article-list {
  list-style: none;
  padding-left: 28px;
  padding-top: 2px;
  padding-bottom: 4px;
}

.sidebar-article-list li {
  margin-bottom: 2px;
}

.sidebar-article-list a {
  display: block;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-article-list a:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.sidebar-article-list a.active {
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 500;
}

/* Article Content Header */
.article-content-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

.article-main {
  flex: 1;
  min-width: 0;
}
  flex: 1;
  min-width: 0;
}

.article-content-body {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.article-content-body h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.article-content-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 28px 0 12px;
}

.article-content-body p {
  margin-bottom: 16px;
  color: var(--text-secondary);
}

.article-content-body ul,
.article-content-body ol {
  margin: 0 0 20px 24px;
  color: var(--text-secondary);
}

.article-content-body li {
  margin-bottom: 8px;
}

.article-content-body img {
  border-radius: var(--radius-md);
  margin: 24px 0;
  box-shadow: var(--shadow-md);
}

.article-content-body code {
  background: var(--bg-hover);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-family: "SF Mono", "Fira Code", monospace;
  font-size: 0.875rem;
  color: var(--primary);
}

.article-content-body pre {
  background: #1e293b;
  color: #e2e8f0;
  padding: 20px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 20px 0;
  font-family: "SF Mono", "Fira Code", monospace;
  font-size: 0.875rem;
  line-height: 1.6;
}

.article-sidebar {
  position: sticky;
  top: 100px;
}

.sidebar-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 20px;
}

.sidebar-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 14px;
}

.sidebar-list {
  list-style: none;
}

.sidebar-list li {
  margin-bottom: 8px;
}

.sidebar-list a {
  display: block;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.sidebar-list a:hover,
.sidebar-list a.active {
  background: var(--primary-light);
  color: var(--primary);
}

/* ===== Category Page ===== */
.category-hero {
  padding: 120px 0 40px;
  background: linear-gradient(180deg, var(--primary-light) 0%, var(--bg-body) 100%);
}

.category-hero h1 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.category-hero p {
  color: var(--text-secondary);
  font-size: 1rem;
}

.category-hero-search {
  margin-top: 24px;
}

.category-hero-search .search-box {
  margin-bottom: 0;
}

.filter-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.filter-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.filter-tab {
  padding: 8px 16px;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.filter-tab:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.filter-tab.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.sort-select {
  padding: 8px 14px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
}

/* ===== Pagination ===== */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 48px;
}

.page-btn {
  min-width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.page-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.page-btn.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.page-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ===== Admin Layout ===== */
.admin-layout {
  display: flex;
  min-height: 100vh;
}

.admin-sidebar {
  width: 260px;
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
  transition: transform var(--transition-smooth);
}

.admin-sidebar-header {
  padding: 20px 24px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.admin-sidebar-header .logo {
  color: #f8fafc;
}

.admin-nav {
  flex: 1;
  padding: 16px 12px;
  overflow-y: auto;
}

.admin-nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--sidebar-text);
  transition: all var(--transition-fast);
  margin-bottom: 4px;
}

.admin-nav-item:hover,
.admin-nav-item.active {
  background: rgba(255,255,255,0.06);
  color: #f8fafc;
}

.admin-nav-item.active {
  background: rgba(59, 130, 246, 0.15);
  color: var(--sidebar-active);
}

.admin-nav-item svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.admin-sidebar-footer {
  padding: 16px;
  border-top: 1px solid rgba(255,255,255,0.06);
}

.admin-sidebar-footer a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  color: var(--sidebar-text);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.admin-sidebar-footer a:hover {
  background: rgba(255,255,255,0.06);
  color: #fff;
}

.admin-main {
  flex: 1;
  margin-left: 260px;
  background: var(--bg-admin);
  min-height: 100vh;
}

.admin-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 32px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 50;
}

.admin-menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.admin-menu-toggle:hover {
  background: var(--bg-hover);
}

.admin-menu-toggle svg {
  width: 22px;
  height: 22px;
}

.admin-header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.admin-sidebar-footer svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.admin-page-title {
  font-size: 1.375rem;
  font-weight: 700;
}

.admin-content {
  padding: 32px;
}

/* Stats Cards */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
  margin-bottom: 32px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: box-shadow var(--transition-base);
}

.stat-card:hover {
  box-shadow: var(--shadow-md);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.stat-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.stat-change {
  font-size: 0.8125rem;
  font-weight: 500;
}

.stat-change.up { color: var(--success); }
.stat-change.down { color: var(--danger); }

/* Data Table */
.data-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.data-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: 12px;
}

.data-card-title {
  font-size: 1.0625rem;
  font-weight: 600;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th,
.data-table td {
  padding: 14px 24px;
  text-align: left;
  font-size: 0.9375rem;
}

.data-table th {
  font-weight: 600;
  color: var(--text-muted);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-hover);
}

.data-table td {
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-light);
}

.data-table tr:hover td {
  background: var(--bg-hover);
}

.data-table tr:last-child td {
  border-bottom: none;
}

.table-actions {
  display: flex;
  gap: 6px;
}

.table-actions button {
  padding: 6px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.table-actions button:hover {
  background: var(--bg-hover);
}

.table-actions button.edit:hover { color: var(--primary); }
.table-actions button.delete:hover { color: var(--danger); }

.table-actions svg {
  width: 16px;
  height: 16px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
}

.badge-success { background: var(--success-light); color: var(--success); }
.badge-warning { background: var(--warning-light); color: #b45309; }
.badge-draft { background: var(--bg-hover); color: var(--text-muted); }

/* ===== Forms ===== */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 10px 14px;
  font-size: 0.9375rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-input);
  color: var(--text-primary);
  transition: all var(--transition-fast);
  outline: none;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
  line-height: 1.6;
}

.form-select {
  cursor: pointer;
}

/* Image Upload */
.image-upload {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  background: var(--bg-hover);
}

.image-upload:hover {
  border-color: var(--primary);
  background: var(--primary-light);
}

.image-upload svg {
  width: 40px;
  height: 40px;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.image-upload-text {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.image-upload-hint {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.image-preview {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}

.image-preview-item {
  position: relative;
  width: 120px;
  height: 120px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.image-preview-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-preview-remove {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(0,0,0,0.5);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: background var(--transition-fast);
}

.image-preview-remove:hover {
  background: var(--danger);
}

/* ===== Media Library Grid ===== */
.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px;
  padding: 20px 24px 8px;
}

.media-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-card);
  transition: box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.media-item:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.12);
}

.media-item-thumb {
  width: 100%;
  aspect-ratio: 1;
  overflow: hidden;
  background: var(--bg-hover);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.media-item-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.2s;
}

.media-item-thumb:hover img {
  transform: scale(1.05);
}

.media-item-name {
  padding: 6px 8px 2px;
  font-size: 12px;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.media-item-size {
  padding: 0 8px 8px;
  font-size: 11px;
  color: var(--text-muted);
}

.media-count-label {
  font-size: 13px;
  color: var(--text-muted);
}

.media-pagination {
  padding: 16px 24px 20px;
}

.media-page-btns {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.media-page-btn {
  min-width: 36px;
  height: 36px;
  padding: 0 10px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.media-page-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.media-page-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.media-detail-preview {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 180px;
  background: var(--bg-hover);
  border-radius: var(--radius-md);
  overflow: hidden;
}

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-modal);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 640px;
  max-height: 90vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transform: scale(0.95) translateY(10px);
  transition: transform var(--transition-base);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
}

.modal-title {
  font-size: 1.125rem;
  font-weight: 600;
}

.modal-close {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.modal-close svg {
  width: 18px;
  height: 18px;
}

.modal-body {
  padding: 24px;
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  padding: 16px 24px;
  border-top: 1px solid var(--border-color);
}

/* ===== Login Page ===== */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-body) 0%, var(--primary-light) 100%);
  padding: 24px;
}

.login-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-lg);
}

.login-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 32px;
  font-size: 1.5rem;
  font-weight: 800;
}

.login-logo-icon {
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: white;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-logo-icon svg {
  width: 24px;
  height: 24px;
}

/* ===== Footer ===== */
.footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  padding: 40px 0;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-copy {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--primary);
}

/* ===== Quill Editor ===== */
#articleEditor {
  background: var(--bg-input);
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.6;
}
#articleEditor.ql-container {
  border-color: var(--border-color);
  border-radius: 0 0 8px 8px;
}
.ql-toolbar.ql-snow {
  border-color: var(--border-color) !important;
  border-radius: 8px 8px 0 0;
  background: var(--bg-hover);
}
.ql-container.ql-snow {
  border-color: var(--border-color) !important;
  border-radius: 0 0 8px 8px;
}
.ql-editor {
  min-height: 280px;
  max-height: 400px;
  overflow-y: auto;
}
.dark .ql-toolbar.ql-snow {
  background: var(--bg-hover);
  border-color: var(--border-color) !important;
}
.dark .ql-toolbar .ql-stroke {
  stroke: var(--text-secondary);
}
.dark .ql-toolbar .ql-fill {
  fill: var(--text-secondary);
}
.dark .ql-toolbar .ql-picker-label {
  color: var(--text-secondary);
}
.dark .ql-editor.ql-blank::before {
  color: var(--text-muted);
}
.dark .ql-picker-options {
  background: var(--bg-card);
  border-color: var(--border-color) !important;
}

/* ===== Settings Page ===== */
.nav-menu-item {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: nowrap;
}

.settings-toggle-label {
  position: relative;
  display: inline-flex;
  cursor: pointer;
  flex-shrink: 0;
}

.settings-toggle-label input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.settings-toggle-track {
  display: block;
  width: 44px;
  height: 24px;
  background: var(--border-color);
  border-radius: 12px;
  transition: background var(--transition-fast);
  position: relative;
}

.settings-toggle-track::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  background: #fff;
  border-radius: 50%;
  transition: transform var(--transition-fast);
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.settings-toggle-label input:checked + .settings-toggle-track {
  background: var(--primary);
}

.settings-toggle-label input:checked + .settings-toggle-track::after {
  transform: translateX(20px);
}

/* ===== Toast ===== */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toast {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: 0.9375rem;
  animation: toast-in 0.3s ease;
  max-width: 360px;
}

.toast.success { border-left: 3px solid var(--success); }
.toast.error { border-left: 3px solid var(--danger); }
.toast.warning { border-left: 3px solid var(--warning); }

.toast svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.toast.success svg { color: var(--success); }
.toast.error svg { color: var(--danger); }
.toast.warning svg { color: var(--warning); }

@keyframes toast-in {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* ===== Mobile Menu Toggle ===== */
.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--text-primary);
}

.menu-toggle svg {
  width: 22px;
  height: 22px;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .article-layout {
    flex-direction: column;
    gap: 24px;
  }

  .article-sidebar-nav {
    width: 100%;
  }

  .article-sidebar-inner {
    position: static;
  }

  .admin-layout {
    flex-direction: column;
  }

  .admin-sidebar {
    transform: translateX(-100%);
    width: 280px;
  }

  .admin-sidebar.open {
    transform: translateX(0);
  }

  .admin-main {
    margin-left: 0;
  }

  .sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    z-index: 99;
    display: none;
  }

  .sidebar-overlay.active {
    display: block;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .categories-grid,
  .articles-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }

  .filter-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .article-header-title {
    font-size: 1.5rem;
  }

  .admin-content {
    padding: 20px;
  }

  .data-table {
    font-size: 0.875rem;
  }

  .data-table th,
  .data-table td {
    padding: 10px 14px;
  }

  .login-card {
    padding: 28px 20px;
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .data-card-header {
    flex-direction: column;
    align-items: stretch;
  }
}