/* ==========================================
   前台样式兼容层 - frontend-compat.css
   兼容旧CSS类名，确保所有前台页面正常显示
   ========================================== */

/* ==========================================
   按钮兼容
   ========================================== */
.btn,
button[type="submit"],
button[type="button"],
a.btn {
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 8px !important;
    padding: 8px 16px !important;
    font-size: 14px !important;
    font-weight: 500 !important;
    border: none !important;
    border-radius: 8px !important;
    cursor: pointer !important;
    transition: all 0.2s ease !important;
    text-decoration: none !important;
    white-space: nowrap !important;
    width: auto !important;
    box-sizing: border-box !important;
    line-height: 1.5 !important;
}

.btn-primary,
button.btn-primary {
    background: linear-gradient(135deg, #2563eb 0%, #0891b2 100%) !important;
    color: #ffffff !important;
}

.btn-primary:hover,
button.btn-primary:hover {
    transform: translateY(-1px) !important;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3) !important;
}

.btn-secondary,
button.btn-secondary {
    background: #f1f5f9 !important;
    color: #475569 !important;
    border: 1px solid #e2e8f0 !important;
}

.btn-secondary:hover,
button.btn-secondary:hover {
    background: #e2e8f0 !important;
}

.btn-sm {
    padding: 6px 12px !important;
    font-size: 13px !important;
}

.btn-lg {
    padding: 12px 24px !important;
    font-size: 16px !important;
}

/* ==========================================
   表单兼容
   ========================================== */
.form-group {
    margin-bottom: 20px !important;
    width: 100% !important;
    box-sizing: border-box !important;
}

.form-label,
label {
    display: block !important;
    margin-bottom: 8px !important;
    font-size: 14px !important;
    font-weight: 600 !important;
    color: #334155 !important;
    width: 100% !important;
}

.form-input,
input[type="text"],
input[type="password"],
input[type="email"],
input[type="number"],
input[type="tel"] {
    width: 100% !important;
    padding: 10px 14px !important;
    font-size: 14px !important;
    line-height: 1.5 !important;
    color: #0f172a !important;
    background: #ffffff !important;
    border: 2px solid #e2e8f0 !important;
    border-radius: 8px !important;
    transition: all 0.2s ease !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
}

.form-input:focus,
input[type="text"]:focus,
input[type="password"]:focus,
input[type="email"]:focus,
input[type="number"]:focus,
input[type="tel"]:focus {
    outline: none !important;
    border-color: #2563eb !important;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1) !important;
}

.form-select,
select {
    width: 100% !important;
    padding: 10px 40px 10px 14px !important;
    font-size: 14px !important;
    line-height: 1.5 !important;
    color: #0f172a !important;
    background: #ffffff !important;
    border: 2px solid #e2e8f0 !important;
    border-radius: 8px !important;
    transition: all 0.2s ease !important;
    cursor: pointer !important;
    appearance: none !important;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M6 8L1 3h10z'/%3E%3C/svg%3E") !important;
    background-repeat: no-repeat !important;
    background-position: right 14px center !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
}

.form-select:focus,
select:focus {
    outline: none !important;
    border-color: #2563eb !important;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1) !important;
}

.form-textarea,
textarea {
    width: 100% !important;
    padding: 10px 14px !important;
    font-size: 14px !important;
    line-height: 1.5 !important;
    color: #0f172a !important;
    background: #ffffff !important;
    border: 2px solid #e2e8f0 !important;
    border-radius: 8px !important;
    transition: all 0.2s ease !important;
    min-height: 100px !important;
    resize: vertical !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
}

.form-textarea:focus,
textarea:focus {
    outline: none !important;
    border-color: #2563eb !important;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1) !important;
}

/* ==========================================
   卡片兼容
   ========================================== */
.card,
.case-card,
.exam-card,
.chapter-card {
    background: #ffffff !important;
    border-radius: 12px !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06) !important;
    border: 1px solid #e2e8f0 !important;
    overflow: hidden !important;
    box-sizing: border-box !important;
    width: 100% !important;
}

.card-body {
    padding: 20px !important;
    width: 100% !important;
    box-sizing: border-box !important;
}

.card-header {
    padding: 16px 20px !important;
    border-bottom: 1px solid #e2e8f0 !important;
    background: #f8fafc !important;
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    gap: 12px !important;
    flex-wrap: wrap !important;
    width: 100% !important;
    box-sizing: border-box !important;
}

.card-footer {
    padding: 12px 20px !important;
    border-top: 1px solid #e2e8f0 !important;
    background: #f8fafc !important;
    width: 100% !important;
    box-sizing: border-box !important;
}

.card-title,
.card-title h2,
.card-title h3 {
    font-size: 18px !important;
    font-weight: 700 !important;
    color: #0f172a !important;
    margin: 0 !important;
}

/* ==========================================
   表格兼容
   ========================================== */
.table-wrapper {
    overflow-x: auto !important;
    border-radius: 12px !important;
    background: #ffffff !important;
    border: 1px solid #e2e8f0 !important;
    margin-bottom: 20px !important;
    width: 100% !important;
    box-sizing: border-box !important;
}

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

.table th,
.table td {
    padding: 12px 16px !important;
    text-align: left !important;
    white-space: nowrap !important;
    box-sizing: border-box !important;
}

.table thead {
    background: #f8fafc !important;
}

.table th {
    font-weight: 600 !important;
    color: #334155 !important;
    border-bottom: 2px solid #e2e8f0 !important;
    font-size: 13px !important;
    text-transform: uppercase !important;
    letter-spacing: 0.025em !important;
}

.table td {
    border-bottom: 1px solid #f1f5f9 !important;
    color: #0f172a !important;
    font-size: 14px !important;
}

.table tbody tr:hover {
    background: #f8fafc !important;
}

.table tbody tr:last-child td {
    border-bottom: none !important;
}

/* ==========================================
   徽章兼容
   ========================================== */
.badge,
.filter-tag,
.case-tag {
    display: inline-flex !important;
    align-items: center !important;
    padding: 4px 12px !important;
    font-size: 12px !important;
    font-weight: 600 !important;
    border-radius: 100px !important;
    white-space: nowrap !important;
}

.badge-primary {
    background: #eff6ff !important;
    color: #2563eb !important;
}

.badge-success {
    background: #d1fae5 !important;
    color: #059669 !important;
}

.badge-warning {
    background: #fef3c7 !important;
    color: #d97706 !important;
}

.badge-danger {
    background: #fee2e2 !important;
    color: #dc2626 !important;
}

.badge-info {
    background: #e0e7ff !important;
    color: #4f46e5 !important;
}

/* ==========================================
   空状态兼容
   ========================================== */
.empty-state {
    text-align: center !important;
    padding: 60px 20px !important;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%) !important;
    border-radius: 16px !important;
    border: 2px dashed #e2e8f0 !important;
    width: 100% !important;
    box-sizing: border-box !important;
}

.empty-state-icon {
    font-size: 64px !important;
    margin-bottom: 16px !important;
}

.empty-state h3,
.empty-state h4 {
    font-size: 18px !important;
    font-weight: 600 !important;
    color: #334155 !important;
    margin: 12px 0 8px 0 !important;
}

.empty-state p {
    font-size: 14px !important;
    color: #64748b !important;
    margin: 0 !important;
}

/* ==========================================
   工具栏和筛选器兼容
   ========================================== */
.toolbar,
.filter-section {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    gap: 16px !important;
    padding: 16px 0 !important;
    flex-wrap: wrap !important;
    width: 100% !important;
    box-sizing: border-box !important;
}

.toolbar-left,
.filter-bar {
    display: flex !important;
    align-items: center !important;
    gap: 12px !important;
    flex-wrap: wrap !important;
}

.toolbar-right {
    display: flex !important;
    align-items: center !important;
    gap: 12px !important;
    flex-wrap: wrap !important;
}

.filter-group {
    position: relative !important;
    flex-shrink: 0 !important;
}

.custom-select {
    min-width: 180px !important;
}

.select-trigger {
    padding: 10px 14px !important;
    cursor: pointer !important;
    display: flex !important;
    align-items: center !important;
    gap: 10px !important;
    border-radius: 8px !important;
    border: 2px solid #e2e8f0 !important;
    transition: all 0.2s ease !important;
    width: 100% !important;
    box-sizing: border-box !important;
}

/* ==========================================
   网格布局兼容
   ========================================== */
.cases-grid,
.stats-bar {
    display: grid !important;
    gap: 20px !important;
    width: 100% !important;
    box-sizing: border-box !important;
}

.cases-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)) !important;
}

.stats-bar {
    grid-template-columns: repeat(4, 1fr) !important;
}

/* ==========================================
   弹窗兼容
   ========================================== */
.modal-overlay {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    background: rgba(0, 0, 0, 0.5) !important;
    z-index: 1000 !important;
    display: none !important;
    align-items: center !important;
    justify-content: center !important;
    padding: 20px !important;
    width: 100% !important;
    max-width: 100vw !important;
    box-sizing: border-box !important;
    overflow: auto !important;
}

.modal-overlay.active {
    display: flex !important;
}

.modal-container,
.modal-box {
    background: #ffffff !important;
    border-radius: 12px !important;
    max-width: 900px !important;
    width: 100% !important;
    max-height: 90vh !important;
    overflow-y: auto !important;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1) !important;
    box-sizing: border-box !important;
}

.modal-header {
    padding: 16px 20px !important;
    border-bottom: 1px solid #e2e8f0 !important;
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    width: 100% !important;
}

.modal-header h2 {
    margin: 0 !important;
    font-size: 18px !important;
    font-weight: 700 !important;
}

.modal-body {
    padding: 20px !important;
    width: 100% !important;
    box-sizing: border-box !important;
}

.modal-footer {
    padding: 12px 20px !important;
    border-top: 1px solid #e2e8f0 !important;
    display: flex !important;
    align-items: center !important;
    justify-content: flex-end !important;
    gap: 8px !important;
    width: 100% !important;
    box-sizing: border-box !important;
}

/* ==========================================
   英雄区兼容
   ========================================== */
.hero {
    width: 100% !important;
    max-width: 100% !important;
    text-align: center !important;
    padding: 40px 24px !important;
    box-sizing: border-box !important;
}

.hero h1 {
    font-size: 32px !important;
    font-weight: 700 !important;
    margin: 0 0 16px 0 !important;
    width: 100% !important;
    word-wrap: break-word !important;
    overflow-wrap: break-word !important;
}

.hero p {
    font-size: 16px !important;
    max-width: 100% !important;
    margin: 0 auto !important;
}

/* ==========================================
   工具类和辅助类
   ========================================== */
.text-center { text-align: center !important; }
.text-left { text-align: left !important; }
.text-right { text-align: right !important; }

.text-sm { font-size: 13px !important; }
.text-base { font-size: 14px !important; }
.text-lg { font-size: 16px !important; }
.text-xl { font-size: 20px !important; }
.text-2xl { font-size: 24px !important; }

.font-semibold { font-weight: 600 !important; }
.font-bold { font-weight: 700 !important; }

.text-primary { color: #2563eb !important; }
.text-secondary { color: #64748b !important; }
.text-muted { color: #94a3b8 !important; }
.text-success { color: #10b981 !important; }
.text-warning { color: #f59e0b !important; }
.text-error { color: #ef4444 !important; }

.mb-sm { margin-bottom: 8px !important; }
.mb-md { margin-bottom: 16px !important; }
.mb-lg { margin-bottom: 24px !important; }

.mt-sm { margin-top: 8px !important; }
.mt-md { margin-top: 16px !important; }
.mt-lg { margin-top: 24px !important; }

/* ==========================================
   响应式 - 手机
   ========================================== */
@media (max-width: 768px) {
    .stats-bar {
        grid-template-columns: repeat(2, 1fr) !important;
    }
    
    .cases-grid {
        grid-template-columns: 1fr !important;
    }
    
    .toolbar,
    .filter-section {
        flex-direction: column !important;
        align-items: stretch !important;
    }
    
    .filter-bar {
        flex-direction: column !important;
    }
    
    .btn {
        width: 100% !important;
    }
}

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