/* ====================================
   Unified Theme for PDF-Allrounder
   Modern, consistent design system
   ==================================== */

:root {
    /* Primary Colors - Premium Cyber Theme */
    --primary-gradient: linear-gradient(135deg, #4fc3f7 0%, #303f9f 100%);
    --primary-color: #4fc3f7;
    --primary-dark: #1976d2;
    --primary-light: #81d4fa;
    --accent-color: #f50057;
    
    /* Semantic Colors */
    --success-color: #00e676;
    --warning-color: #ffb300;
    --danger-color: #ff5252;
    --info-color: #29b6f6;
    
    /* Dark Theme Neutral Colors */
    --text-primary: #ffffff;
    --text-secondary: #b0bec5;
    --text-muted: #78909c;
    
    /* Background & Surface (Glassmorphism) */
    --background: linear-gradient(135deg, #0f0f1a 0%, #1a1a2e 100%);
    --background-solid: #11111e;
    --surface: rgba(30, 30, 50, 0.6);
    --surface-hover: rgba(45, 45, 75, 0.8);
    --border: rgba(255, 255, 255, 0.1);
    --border-light: rgba(255, 255, 255, 0.05);
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.2);
    --shadow-md: 0 4px 8px rgba(0,0,0,0.3);
    --shadow-lg: 0 10px 20px rgba(0,0,0,0.4);
    --shadow-xl: 0 20px 40px rgba(0,0,0,0.5);
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Courier New', monospace;
}

/* ==================== 
   Global Resets 
   ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    background: var(--background);
    background-attachment: fixed;
    line-height: 1.6;
    min-height: 100vh;
}

/* ==================== 
   Container & Layout 
   ==================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

.container-fluid {
    width: 100%;
    padding: var(--spacing-lg);
}

/* ==================== 
   Page Header 
   ==================== */
.page-header {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--border-light);
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.page-header .subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-sm);
}

/* ==================== 
   Cards 
   ==================== */
.card,
.settings-card,
.section,
.glass-panel {
    background: var(--surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.card-header,
.section-header {
    background: var(--primary-gradient);
    color: white;
    padding: var(--spacing-lg);
    font-weight: 600;
}

.card-header h2,
.section-header h2 {
    margin: 0;
    font-size: 1.25rem;
    color: white;
}

.card-body,
.section-content {
    padding: var(--spacing-lg);
}

/* ==================== 
   Buttons 
   ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 10px 20px;
    font-size: 0.875rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--text-primary);
}

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

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

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

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

.btn-outline-primary {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-outline-primary:hover:not(:disabled) {
    background: var(--primary-color);
    color: white;
}

.btn-outline-secondary {
    background: transparent;
    border: 2px solid var(--border);
    color: var(--text-secondary);
}

.btn-outline-secondary:hover:not(:disabled) {
    background: var(--text-secondary);
    color: white;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.75rem;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1rem;
}

/* ==================== 
   Forms 
   ==================== */
.form-control {
    width: 100%;
    padding: 10px 14px;
    font-size: 0.875rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: rgba(15, 15, 25, 0.5);
    color: var(--text-primary);
    transition: all 0.2s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 195, 247, 0.2);
    background: rgba(20, 20, 35, 0.8);
}

.form-control-sm {
    padding: 6px 10px;
    font-size: 0.75rem;
}

textarea.form-control {
    resize: vertical;
    font-family: var(--font-mono);
}

input[type="checkbox"],
input[type="radio"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

label {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    user-select: none;
}

/* ==================== 
   Tables 
   ==================== */
.table {
    width: 100%;
    border-collapse: collapse;
    background: var(--surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.table thead {
    background: var(--primary-gradient);
    color: white;
}

.table th {
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
}

.table tbody tr:hover {
    background: var(--border-light);
}

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

/* ==================== 
   Badges 
   ==================== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    white-space: nowrap;
}

.badge-success {
    background: #d1fae5;
    color: #065f46;
}

.badge-danger {
    background: #fee2e2;
    color: #991b1b;
}

.badge-warning {
    background: #fef3c7;
    color: #92400e;
}

.badge-info {
    background: #dbeafe;
    color: #1e40af;
}

.badge-coming {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    padding: 2px 8px;
    font-size: 11px;
    margin-left: auto;
}

/* ==================== 
   Drop Zones 
   ==================== */
.drop-zone,
.upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    background: var(--border-light);
    cursor: pointer;
    transition: all 0.3s ease;
}

.drop-zone:hover,
.upload-area:hover,
.drop-zone.dragover,
.upload-area.dragover {
    border-color: var(--primary-color);
    background: rgba(102, 126, 234, 0.05);
}

.drop-zone-content,
.upload-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.drop-icon,
.upload-icon {
    font-size: 3rem;
    opacity: 0.5;
}

.drop-hint,
.upload-hint {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ==================== 
   Alerts 
   ==================== */
.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.alert-success {
    background: #d1fae5;
    color: #065f46;
    border-left: 4px solid var(--success-color);
}

.alert-danger {
    background: #fee2e2;
    color: #991b1b;
    border-left: 4px solid var(--danger-color);
}

.alert-warning {
    background: #fef3c7;
    color: #92400e;
    border-left: 4px solid var(--warning-color);
}

.alert-info {
    background: #dbeafe;
    color: #1e40af;
    border-left: 4px solid var(--info-color);
}

/* ==================== 
   Grid System 
   ==================== */
.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

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

.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-sm); }
.p-2 { padding: var(--spacing-md); }
.p-3 { padding: var(--spacing-lg); }
.p-4 { padding: var(--spacing-xl); }

/* ==================== 
   Responsive 
   ==================== */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }
    
    .page-header h1 {
        font-size: 2rem;
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
}

/* ==================== 
   Loading & Spinners 
   ==================== */
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-light);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}