:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-primary);
}

/* Header */
.app-header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    border-bottom: 1px solid var(--border-color);
}

.logo-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
}

.company-name {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.company-tagline {
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 500;
}

.header-badge {
    background: linear-gradient(135deg, var(--success-color), #059669);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
}

/* Main Content */
.app-main {
    padding: 40px 0;
}

.app-card {
    background: var(--card-bg);
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.card-header-section {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 30px;
    text-align: center;
}

.card-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
}

.card-subtitle {
    font-size: 14px;
    opacity: 0.9;
    margin: 0;
}

/* Mode Tabs */
.mode-tabs {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 20px;
}

.mode-tab {
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    font-size: 14px;
}

.mode-tab:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
}

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

.mode-content {
    display: block;
}

.mode-content[style*="display: none"] {
    display: none !important;
}

/* PDF Preview */
.pdf-item {
    position: relative;
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 2px solid var(--border-color);
    transition: all 0.3s ease;
}

.pdf-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.pdf-item-preview {
    width: 100%;
    height: 150px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 48px;
}

.card-body-section {
    padding: 40px;
}

/* Upload Area */
.upload-section {
    margin-bottom: 30px;
}

.upload-area {
    border: 3px dashed var(--border-color);
    border-radius: 16px;
    padding: 60px 20px;
    text-align: center;
    background: var(--bg-color);
    transition: all 0.3s ease;
    cursor: pointer;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.05);
}

.upload-area.dragover {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.1);
    transform: scale(1.02);
}

.upload-content {
    pointer-events: none;
}

.upload-icon {
    font-size: 64px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.upload-area h4 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.upload-area p {
    font-size: 14px;
    margin-bottom: 20px;
}

/* Images List */
.images-list-section {
    background: var(--bg-color);
    border-radius: 12px;
    padding: 20px;
    border: 1px solid var(--border-color);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.section-header h5 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.images-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
}

.image-item {
    position: relative;
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 2px solid var(--border-color);
    transition: all 0.3s ease;
}

.image-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.image-item img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    display: block;
}

.image-item-actions {
    position: absolute;
    top: 8px;
    right: 8px;
    display: flex;
    gap: 6px;
}

.image-item-btn {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s ease;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.9);
}

.image-item-btn:hover {
    transform: scale(1.1);
}

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

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

.btn-move {
    color: var(--text-secondary);
    cursor: move;
}

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

.image-item-info {
    padding: 10px;
    font-size: 12px;
    color: var(--text-secondary);
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.image-item.dragging {
    opacity: 0.5;
    transform: scale(0.95);
}

/* Options Section */
.options-section {
    background: var(--bg-color);
    border-radius: 12px;
    padding: 20px;
    border: 1px solid var(--border-color);
}

.form-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    font-size: 14px;
}

.form-select,
.form-control {
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 14px;
    transition: all 0.2s ease;
}

.form-select:focus,
.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    outline: none;
}

/* Submit Section */
.submit-section {
    margin-top: 30px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border: none;
    border-radius: 12px;
    padding: 14px 28px;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
}

.btn-primary:disabled {
    opacity: 0.7;
    transform: none;
}

/* Info Card */
.info-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 25px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.info-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.info-item i {
    font-size: 24px;
}

.info-item strong {
    display: block;
    font-size: 14px;
    color: var(--text-primary);
    margin-bottom: 4px;
}

/* Footer */
.app-footer {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--border-color);
    margin-top: 40px;
}

/* Toast Notifications */
.toast-container {
    min-width: 300px;
}

.toast {
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    border: none;
    margin-bottom: 10px;
}

.toast-header {
    border-radius: 12px 12px 0 0;
    font-weight: 600;
    padding: 12px 16px;
}

.toast-body {
    padding: 16px;
    font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
    .card-body-section {
        padding: 25px;
    }
    
    .upload-area {
        padding: 40px 15px;
    }
    
    .upload-icon {
        font-size: 48px;
    }
    
    .company-name {
        font-size: 20px;
    }
    
    .header-badge {
        font-size: 12px;
        padding: 6px 12px;
    }
    
    .toast-container {
        min-width: 280px;
        padding: 10px !important;
    }
}

/* Loading Animation */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.loading {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}