/* Material Design 3 UI with Dark Mode */

:root {
  --primary: #6750A4;
  --primary-container: #E8DEF8;
  --on-primary: #FFFFFF;
  --secondary: #625B71;
  --surface: #FFFBFE;
  --surface-variant: #F3EDF7;
  --surface-container: #F0F0F3;
  --on-surface: #1C1B1F;
  --on-surface-variant: #49454F;
  --outline: #79747E;
  --outline-variant: #CAC4D0;
  --error: #B3261E;
  --success: #386A20;
  --warning: #F57C00;
  --info: #1976D2;
  --shadow: rgba(0, 0, 0, 0.1);
  --sidebar-width: 260px;
  --sidebar-collapsed: 72px;
  --topbar-height: 64px;
}

[data-theme="dark"] {
  --primary: #D0BCFF;
  --primary-container: #4F378B;
  --on-primary: #381E72;
  --secondary: #CCC2DC;
  --surface: #1C1B1F;
  --surface-variant: #49454F;
  --surface-container: #2B2930;
  --on-surface: #E6E1E5;
  --on-surface-variant: #CAC4D0;
  --outline: #938F99;
  --outline-variant: #49454F;
  --shadow: rgba(0, 0, 0, 0.3);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans SC', sans-serif;
  background: var(--surface);
  color: var(--on-surface);
  min-height: 100vh;
  line-height: 1.5;
  overflow-x: hidden;
}

/* ==================== 登录页 ==================== */
.login-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: linear-gradient(135deg, var(--primary-container) 0%, #FFD8E4 100%);
}

[data-theme="dark"] .login-container {
  background: linear-gradient(135deg, var(--surface-container) 0%, #2B2930 100%);
}

.login-box {
  background: var(--surface);
  border-radius: 28px;
  padding: 48px 40px;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 8px 32px var(--shadow);
}

.login-box h1 {
  font-size: 28px;
  font-weight: 500;
  text-align: center;
  margin-bottom: 48px;
  color: var(--primary);
}

.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 13px; font-weight: 500; color: var(--on-surface-variant); margin-bottom: 8px; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 14px 16px; border: 1px solid var(--outline); border-radius: 12px;
  font-size: 15px; background: var(--surface); color: var(--on-surface);
  transition: all 0.2s ease; outline: none;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-container);
}
.form-group small { font-size: 12px; color: var(--on-surface-variant); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

.btn-login {
  width: 100%; padding: 14px 24px; background: var(--primary); color: var(--on-primary);
  border: none; border-radius: 12px; font-size: 15px; font-weight: 500; cursor: pointer;
  transition: all 0.2s ease; margin-top: 12px;
}
.btn-login:hover { opacity: 0.9; box-shadow: 0 4px 12px var(--shadow); }
.btn-login:active { transform: scale(0.98); }

.message { margin-top: 20px; padding: 12px 16px; border-radius: 12px; font-size: 14px; text-align: center; display: none; }
.message.success { display: block; background: #D4EDDA; color: var(--success); }
.message.error { display: block; background: #F8D7DA; color: var(--error); }

/* ==================== 侧边栏 ==================== */
.sidebar {
  position: fixed; left: 0; top: 0; bottom: 0; width: var(--sidebar-width);
  background: var(--surface-container); border-right: 1px solid var(--outline-variant);
  display: flex; flex-direction: column; transition: width 0.3s ease; z-index: 100;
}
.sidebar.collapsed { width: var(--sidebar-collapsed); }

.sidebar-header {
  padding: 20px; display: flex; align-items: center; gap: 12px;
  border-bottom: 1px solid var(--outline-variant); min-height: 72px;
}
.logo { font-size: 32px; color: var(--primary); flex-shrink: 0; }
.sidebar-title { font-size: 18px; font-weight: 500; white-space: nowrap; overflow: hidden; }
.sidebar.collapsed .sidebar-title { opacity: 0; width: 0; }
.sidebar-toggle {
  margin-left: auto; background: none; border: none; cursor: pointer; padding: 8px;
  border-radius: 8px; color: var(--on-surface-variant); transition: all 0.2s;
}
.sidebar-toggle:hover { background: var(--surface-variant); }
.sidebar.collapsed .sidebar-toggle { margin-left: 0; }

.nav-section {
  padding: 16px 20px 8px; font-size: 12px; font-weight: 600;
  color: var(--on-surface-variant); text-transform: uppercase; letter-spacing: 0.5px;
}
.sidebar.collapsed .nav-section { display: none; }

.sidebar-nav { flex: 1; padding: 8px; overflow-y: auto; }
.nav-item {
  display: flex; align-items: center; gap: 16px; padding: 12px 16px;
  border-radius: 12px; color: var(--on-surface-variant); text-decoration: none;
  margin-bottom: 2px; transition: all 0.2s;
}
.nav-item:hover { background: var(--surface-variant); color: var(--on-surface); }
.nav-item.active { background: var(--primary-container); color: var(--primary); }
.nav-item .material-symbols-outlined { font-size: 24px; flex-shrink: 0; }
.nav-text { white-space: nowrap; overflow: hidden; font-size: 14px; font-weight: 500; }
.sidebar.collapsed .nav-text { opacity: 0; width: 0; }

.sidebar-footer { padding: 16px; border-top: 1px solid var(--outline-variant); }
.user-info-mini { display: flex; align-items: center; gap: 12px; padding: 8px; border-radius: 12px; background: var(--surface-variant); margin-bottom: 12px; }
.user-info-mini .material-symbols-outlined { font-size: 24px; color: var(--on-surface-variant); }
.user-name { font-size: 14px; font-weight: 500; overflow: hidden; white-space: nowrap; }
.sidebar.collapsed .user-name { opacity: 0; width: 0; }
.sidebar-actions { display: flex; gap: 8px; justify-content: center; }
.btn-icon-small { background: none; border: none; cursor: pointer; padding: 8px; border-radius: 8px; color: var(--on-surface-variant); transition: all 0.2s; }
.btn-icon-small:hover { background: var(--surface-variant); color: var(--primary); }

/* ==================== 主内容区 ==================== */
.main-content { margin-left: var(--sidebar-width); min-height: 100vh; transition: margin-left 0.3s ease; }
.sidebar.collapsed ~ .main-content { margin-left: var(--sidebar-collapsed); }

.topbar {
  position: sticky; top: 0; height: var(--topbar-height); background: var(--surface);
  border-bottom: 1px solid var(--outline-variant); display: flex; align-items: center;
  padding: 0 24px; z-index: 50;
}
.menu-btn { display: none; background: none; border: none; cursor: pointer; padding: 8px; border-radius: 8px; color: var(--on-surface-variant); margin-right: 16px; }
.menu-btn:hover { background: var(--surface-variant); }
.page-title { font-size: 20px; font-weight: 500; flex: 1; }
.topbar-actions { display: flex; gap: 8px; }

.page-container { padding: 24px; max-width: 1400px; }
.page { display: none; }
.page.active { display: block; }

/* ==================== 统计卡片 ==================== */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; margin-bottom: 24px; }
.stat-card { background: var(--surface); border-radius: 20px; padding: 24px; display: flex; align-items: center; gap: 16px; box-shadow: 0 2px 8px var(--shadow); }
.stat-icon { font-size: 48px; color: var(--primary); }
.stat-info { display: flex; flex-direction: column; }
.stat-value { font-size: 32px; font-weight: 600; }
.stat-label { font-size: 14px; color: var(--on-surface-variant); }

/* ==================== 卡片 ==================== */
.card { background: var(--surface); border-radius: 20px; box-shadow: 0 2px 8px var(--shadow); overflow: hidden; }
.card-header { padding: 20px 24px; border-bottom: 1px solid var(--outline-variant); display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.card-header h2 { font-size: 18px; font-weight: 500; }

/* ==================== 按钮 ==================== */
.btn-primary { display: inline-flex; align-items: center; gap: 8px; padding: 10px 20px; background: var(--primary); color: var(--on-primary); border: none; border-radius: 12px; font-size: 14px; font-weight: 500; cursor: pointer; transition: all 0.2s; }
.btn-primary:hover { box-shadow: 0 4px 12px var(--shadow); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; }
.btn-secondary { display: inline-flex; align-items: center; gap: 8px; padding: 10px 20px; background: var(--surface-variant); color: var(--on-surface); border: 1px solid var(--outline); border-radius: 12px; font-size: 14px; font-weight: 500; cursor: pointer; transition: all 0.2s; }
.btn-secondary:hover { background: var(--surface); }
.btn-icon { background: none; border: none; cursor: pointer; padding: 8px; border-radius: 8px; color: var(--on-surface-variant); transition: all 0.2s; }
.btn-icon:hover { background: var(--surface-variant); color: var(--primary); }
.btn-icon.danger:hover { background: #F8D7DA; color: var(--error); }

/* ==================== 表格 ==================== */
.table-container { overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; }
.data-table th, .data-table td { padding: 14px 20px; text-align: left; border-bottom: 1px solid var(--outline-variant); }
.data-table th { font-size: 13px; font-weight: 500; color: var(--on-surface-variant); background: var(--surface-container); }
.data-table td { font-size: 14px; }
.data-table tr:hover td { background: var(--surface-variant); }
.actions { display: flex; gap: 4px; }

.status-badge { display: inline-block; padding: 4px 12px; border-radius: 100px; font-size: 12px; font-weight: 500; }
.status-badge.published, .status-badge.active, .status-badge.success { background: #D4EDDA; color: var(--success); }
.status-badge.draft, .status-badge.inactive { background: var(--surface-variant); color: var(--on-surface-variant); }
.status-badge.info { background: #D1E9FF; color: var(--info); }
.status-badge.warning { background: #FFF3D1; color: var(--warning); }
.status-badge.error { background: #F8D7DA; color: var(--error); }

/* ==================== 模态框 ==================== */
.modal { display: none; position: fixed; inset: 0; background: rgba(0, 0, 0, 0.5); z-index: 200; align-items: center; justify-content: center; padding: 24px; }
.modal.show { display: flex; }
.modal-content { background: var(--surface); border-radius: 28px; width: 100%; max-width: 480px; max-height: 90vh; overflow-y: auto; animation: slideUp 0.3s ease; }
.modal-small { max-width: 400px; }
.modal-large { max-width: 640px; }
@keyframes slideUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
.modal-header { padding: 20px 24px; border-bottom: 1px solid var(--outline-variant); display: flex; align-items: center; justify-content: space-between; }
.modal-header h3 { font-size: 20px; font-weight: 500; }
.modal-content form { padding: 24px; }
.form-actions { display: flex; justify-content: flex-end; gap: 12px; margin-top: 24px; }
.close { font-size: 28px; color: var(--on-surface-variant); cursor: pointer; width: 36px; height: 36px; display: flex; align-items: center; justify-content: center; border-radius: 50%; transition: all 0.2s; }
.close:hover { background: var(--surface-variant); }

/* ==================== 文件管理 ==================== */
.file-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 16px; padding: 24px; }
.file-item { background: var(--surface-variant); border-radius: 16px; padding: 16px; text-align: center; transition: all 0.2s; cursor: pointer; }
.file-item:hover { box-shadow: 0 4px 12px var(--shadow); }
.file-item img { width: 80px; height: 80px; object-fit: cover; border-radius: 8px; margin-bottom: 8px; }
.file-item .material-symbols-outlined { font-size: 48px; color: var(--on-surface-variant); }
.file-name { font-size: 13px; word-break: break-all; margin-bottom: 8px; }

.upload-area { border: 2px dashed var(--outline); border-radius: 16px; padding: 40px; text-align: center; cursor: pointer; transition: all 0.2s; }
.upload-area:hover { border-color: var(--primary); background: var(--surface-variant); }
.upload-area input { display: none; }
.upload-area .material-symbols-outlined { font-size: 48px; color: var(--on-surface-variant); }

/* ==================== 设置页面 ==================== */
.settings-form { padding: 24px; max-width: 600px; }

/* ==================== 响应式 ==================== */
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); width: var(--sidebar-width); }
  .sidebar.open { transform: translateX(0); }
  .sidebar.collapsed { width: var(--sidebar-width); }
  .main-content, .sidebar.collapsed ~ .main-content { margin-left: 0; }
  .menu-btn { display: flex; }
  .sidebar-toggle { display: none; }
  .stats-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .data-table th, .data-table td { padding: 12px 16px; }
  .page-container { padding: 16px; }
  .login-box { padding: 32px 24px; }
}

.overlay { display: none; position: fixed; inset: 0; background: rgba(0, 0, 0, 0.5); z-index: 99; }
.overlay.show { display: block; }

/* ==================== Toast 通知 ==================== */
.toast-container { position: fixed; bottom: 24px; right: 24px; z-index: 300; display: flex; flex-direction: column; gap: 8px; }
.toast { padding: 12px 20px; border-radius: 12px; font-size: 14px; color: white; animation: slideIn 0.3s ease; display: flex; align-items: center; gap: 8px; }
.toast.success { background: var(--success); }
.toast.error { background: var(--error); }
.toast.info { background: var(--info); }
.toast.warning { background: var(--warning); }
@keyframes slideIn { from { opacity: 0; transform: translateX(20px); } to { opacity: 1; transform: translateX(0); } }

/* ==================== 搜索 ==================== */
.search-box { padding: 24px; }
.search-box input { width: 100%; padding: 16px 20px; border: 1px solid var(--outline); border-radius: 12px; font-size: 16px; background: var(--surface); color: var(--on-surface); outline: none; }
.search-box input:focus { border-color: var(--primary); }
.search-results { max-height: 400px; overflow-y: auto; }
.search-result-item { padding: 12px 24px; border-bottom: 1px solid var(--outline-variant); cursor: pointer; display: flex; align-items: center; gap: 12px; }
.search-result-item:hover { background: var(--surface-variant); }
.search-result-item .material-symbols-outlined { color: var(--primary); }
.search-result-info { flex: 1; }
.search-result-title { font-weight: 500; }
.search-result-meta { font-size: 12px; color: var(--on-surface-variant); }
.search-empty { padding: 40px; text-align: center; color: var(--on-surface-variant); }

/* ==================== 标签管理 ==================== */
.tags-grid { display: flex; flex-wrap: wrap; gap: 12px; padding: 24px; }
.tag-item { display: inline-flex; align-items: center; gap: 8px; padding: 8px 16px; background: var(--primary-container); color: var(--primary); border-radius: 100px; font-size: 14px; transition: all 0.2s; }
.tag-item:hover { box-shadow: 0 2px 8px var(--shadow); }
.tag-item .btn-icon-small { padding: 4px; }
.tag-item .btn-icon-small:hover { background: rgba(0,0,0,0.1); color: var(--error); }

/* ==================== Markdown 提示 ==================== */
.markdown-hint { font-size: 12px; color: var(--on-surface-variant); margin-top: 4px; }
.markdown-hint code { background: var(--surface-variant); padding: 2px 6px; border-radius: 4px; font-family: monospace; }