:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --success-color: #16a34a;
    --success-light: #22c55e;
    --error-color: #dc2626;
    --error-light: #ef4444;
    --warning-color: #d97706;
    --warning-light: #f59e0b;
    --background-color: #f8fafc;
    --card-background: #ffffff;
    --text-color: #1e293b;
    --text-light: #64748b;
    --border-color: #e2e8f0;
    
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
}

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

body {
    font-family: system-ui, -apple-system, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.5;
    transition: background-color 0.3s, color 0.3s;
}

/* Dark Mode */
body.dark-theme {
    --background-color: #0f172a;
    --card-background: #1e293b;
    --text-color: #e2e8f0;
    --text-light: #94a3b8;
    --border-color: #334155;
}

/* Layout */
.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header */
.header {
    background-color: var(--card-background);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) 0;
    margin-bottom: var(--spacing-xl);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.title {
    font-size: 1.5rem;
    font-weight: 600;
}

/* Cards */
.card {
    background-color: var(--card-background);
    border-radius: 1rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid var(--border-color);
}

/* Upload Area */
.upload-container {
    margin-bottom: var(--spacing-xl);
}

.upload-area {
    padding: var(--spacing-xl);
    text-align: center;
    border: 2px dashed var(--border-color);
    border-radius: 0.5rem;
    transition: all 0.3s ease;
}

.upload-area.drag-over {
    border-color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.1);
}

.upload-label {
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.upload-icon {
    width: 4rem;
    height: 4rem;
    border: 2px solid var(--text-light);
    border-radius: 50%;
    transition: border-color 0.3s;
}

.upload-text {
    font-size: 1.125rem;
    color: var(--text-color);
}

.upload-info {
    color: var(--text-light);
    font-size: 0.875rem;
}

/* Progress Bar */
.progress-container {
    margin: var(--spacing-md) 0;
}

.progress {
    height: 8px;
    background-color: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-light), var(--primary-color));
    transition: width 0.3s ease;
    width: 0;
}

/* Loading */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    margin: var(--spacing-xl) 0;
}

.spinner {
    width: 3rem;
    height: 3rem;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Results Grid */
.results-grid {
    display: grid;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

/* Compliance Report */
.compliance-report {
    padding: var(--spacing-lg);
}

.report-title {
    margin-bottom: var(--spacing-lg);
    font-size: 1.25rem;
    font-weight: 600;
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25em 0.75em;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
}

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

.badge-error {
    background-color: var(--error-color);
    color: white;
}

/* Toast */
.toast {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--card-background);
    border-radius: 0.5rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    animation: slideIn 0.3s ease-out;
    z-index: 50;
}

/* Skeleton Loading */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--border-color) 25%,
        var(--card-background) 50%,
        var(--border-color) 75%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: 4px;
    height: 1rem;
    margin-bottom: var(--spacing-sm);
}

.skeleton-line {
    height: 1rem;
    margin-bottom: var(--spacing-sm);
}

/* Animations */
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@keyframes slideIn {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes skeleton-loading {
    from {
        background-position: 200% 0;
    }
    to {
        background-position: -200% 0;
    }
}

/* Utilities */
.hidden {
    display: none !important;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .upload-area {
        padding: var(--spacing-lg);
    }
    
    .toast {
        left: var(--spacing-md);
        right: var(--spacing-md);
        bottom: var(--spacing-md);
    }
}