@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

:root {
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --primary-light: #818cf8;
  --secondary: #ec4899;
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --text-secondary: #64748b;
  --border: #e2e8f0;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --radius: 16px;
  --radius-sm: 12px;
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ===== 导航栏 ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.navbar-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.brand-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.1rem;
}

.search-wrap {
  position: relative;
  flex: 1;
  max-width: 480px;
}

.search-wrap svg {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
  width: 18px;
  height: 18px;
  pointer-events: none;
}

.search-wrap input {
  width: 100%;
  padding: 0.65rem 1rem 0.65rem 2.75rem;
  border: 1px solid var(--border);
  border-radius: 9999px;
  background: var(--bg);
  font-size: 0.9rem;
  transition: all 0.2s;
  outline: none;
  font-family: inherit;
}

.search-wrap input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

.nav-actions {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

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

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

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

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

/* ===== Hero ===== */
.hero {
  position: relative;
  padding: 4rem 1.5rem;
  text-align: center;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #ec4899 100%);
  opacity: 0.95;
}

.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.08'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 700px;
  margin: 0 auto;
  color: white;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.hero p {
  font-size: 1.1rem;
  opacity: 0.9;
  margin-bottom: 2rem;
}

/* ===== 分类筛选 ===== */
.categories {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.5rem;
}

.category-list {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: center;
}

.category-chip {
  padding: 0.5rem 1.25rem;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 9999px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.2s;
  white-space: nowrap;
  user-select: none;
}

.category-chip:hover {
  border-color: var(--primary-light);
  color: var(--primary);
  transform: translateY(-1px);
}

.category-chip.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

/* ===== 主内容区 ===== */
.main {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.section-title {
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.badge {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  padding: 0.2rem 0.7rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
}

/* ===== 资源网格 ===== */
.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

/* ===== 卡片 ===== */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  position: relative;
}

.card:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.card-image-wrap {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
}

.card-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s;
}

.card:hover .card-image {
  transform: scale(1.08);
}

.card-category-badge {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.35rem 0.8rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  color: white;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  z-index: 2;
}

.card-body {
  padding: 1.25rem;
}

.card-tags {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

.tag {
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
  border-radius: 9999px;
  background: #f1f5f9;
  color: var(--text-secondary);
  font-weight: 500;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.card-date {
  font-size: 0.8rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  background: var(--primary);
  color: white;
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
}

.btn-download:hover {
  background: var(--primary-dark);
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

/* ===== 免责声明 ===== */
.disclaimer {
  background: linear-gradient(135deg, #fffbeb, #fef3c7);
  border: 1px solid #fcd34d;
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  margin: 2rem 1.5rem;
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.disclaimer-icon {
  width: 24px;
  height: 24px;
  color: var(--warning);
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.disclaimer-content h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: #92400e;
  margin-bottom: 0.35rem;
}

.disclaimer-content p {
  font-size: 0.85rem;
  color: #a16207;
  line-height: 1.5;
}

/* ===== Footer ===== */
.footer {
  text-align: center;
  padding: 2rem 1.5rem;
  color: var(--text-secondary);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
  margin-top: 1rem;
}

/* ===== 空状态 ===== */
.empty-state {
  text-align: center;
  padding: 5rem 1rem;
  color: var(--text-secondary);
  grid-column: 1 / -1;
}

.empty-state svg {
  width: 80px;
  height: 80px;
  margin-bottom: 1.5rem;
  opacity: 0.25;
}

/* ===== 模态框 ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
}

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

.modal {
  background: var(--surface);
  border-radius: var(--radius);
  width: 100%;
  max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  transform: scale(0.95) translateY(10px);
  transition: all 0.3s;
}

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

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 1.15rem;
  font-weight: 600;
}

.modal-close {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: none;
  background: var(--bg);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

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

.modal-body {
  padding: 1.5rem;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

/* ===== 表单 ===== */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.65rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  font-size: 0.9rem;
  font-family: inherit;
  color: var(--text);
  outline: none;
  transition: all 0.2s;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
}

.form-hint {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 0.35rem;
}

/* ===== Admin 专用 ===== */
.admin-stats {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.5rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  transition: all 0.2s;
}

.stat-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--primary-light);
}

.stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.25rem;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.admin-toolbar {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem 1.5rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.admin-table-wrap {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
  overflow-x: auto;
}

.admin-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--surface);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  overflow: hidden;
}

.admin-table th,
.admin-table td {
  padding: 1rem 1.25rem;
  text-align: left;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border);
}

.admin-table th {
  background: var(--bg);
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.admin-table tr:hover td {
  background: #f8fafc;
}

.table-thumb {
  width: 60px;
  height: 40px;
  border-radius: 6px;
  object-fit: cover;
  background: var(--bg);
}

.table-actions {
  display: flex;
  gap: 0.5rem;
}

.btn-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  background: transparent;
  color: var(--text-secondary);
}

.btn-icon:hover {
  background: var(--bg);
  color: var(--primary);
}

.btn-icon.danger:hover {
  color: var(--danger);
  background: #fef2f2;
}

.export-area {
  background: #1e1e2e;
  color: #a6accd;
  border-radius: var(--radius-sm);
  padding: 1rem;
  font-family: 'Fira Code', 'Consolas', monospace;
  font-size: 0.85rem;
  line-height: 1.6;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
  max-height: 400px;
  overflow-y: auto;
}

/* ===== 动画 ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card {
  animation: fadeInUp 0.5s ease-out forwards;
  opacity: 0;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .navbar-inner {
    flex-wrap: wrap;
  }

  .search-wrap {
    order: 3;
    max-width: 100%;
    width: 100%;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

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

  .admin-table-wrap {
    padding: 0 1rem;
  }

  .admin-table th,
  .admin-table td {
    padding: 0.75rem;
    font-size: 0.85rem;
  }

  .disclaimer {
    margin: 1.5rem 1rem;
    flex-direction: column;
    gap: 0.75rem;
  }
}

/* 滚动条 */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}