/* KDB Modern Styles */

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --background-color: #f8fafc;
    --card-background: #ffffff;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
}

body {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Navigation */
.navbar {
    background: rgba(255, 255, 255, 0.95) !important;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-link {
    font-weight: 500;
    color: var(--text-secondary) !important;
    transition: var(--transition);
    padding: 0.75rem 1rem !important;
    border-radius: 8px;
    margin: 0 0.25rem;
}

.nav-link:hover, .nav-link.active {
    color: var(--primary-color) !important;
    background-color: rgba(37, 99, 235, 0.1);
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 3rem 0;
    margin: -1rem -15px 2rem -15px;
    border-radius: 0 0 var(--border-radius) var(--border-radius);
}

.hero-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero-subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

/* Cards */
.card {
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    overflow: hidden;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.card-header {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem;
    font-weight: 600;
}

.card-body {
    padding: 1.5rem;
}

/* Stats Cards */
.stats-card {
    background: linear-gradient(135deg, var(--card-background) 0%, #f8fafc 100%);
    border: none;
    border-radius: var(--border-radius);
    overflow: hidden;
    position: relative;
}

.stats-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--success-color));
}

.stats-card .card-body {
    padding: 2rem;
}

.stats-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stats-label {
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 0.875rem;
}

/* Upload Area */
.upload-section {
    background: var(--card-background);
    border-radius: var(--border-radius);
    padding: 3rem;
    text-align: center;
    border: 2px dashed var(--border-color);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    margin: 2rem 0;
}

.upload-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(37, 99, 235, 0.05), transparent);
    transform: rotate(45deg);
    transition: var(--transition);
    opacity: 0;
}

.upload-section:hover::before {
    opacity: 1;
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: rotate(45deg) translateX(-100%); }
    100% { transform: rotate(45deg) translateX(100%); }
}

.upload-section:hover {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.02);
    transform: scale(1.02);
}

.upload-section.dragover {
    border-color: var(--success-color);
    background: rgba(16, 185, 129, 0.05);
    transform: scale(1.05);
}

.upload-icon {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    display: block;
}

.upload-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.upload-subtitle {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

#file-input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    z-index: 10;
}

/* Buttons */
.btn {
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    transition: var(--transition);
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    background: var(--primary-dark);
}

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

.btn-outline-primary:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

/* File Types Grid */
.file-types-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.file-type-item {
    background: var(--card-background);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.file-type-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.file-type-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    display: block;
}

.fa-file-pdf { color: #ef4444; }
.fa-file-word { color: var(--primary-color); }
.fa-file-excel { color: var(--success-color); }
.fa-file-powerpoint { color: var(--warning-color); }
.fa-file-image { color: #8b5cf6; }
.fa-file-alt { color: var(--text-secondary); }

/* Document Cards */
.document-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.document-card {
    background: var(--card-background);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    cursor: pointer;
}

.document-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.document-header {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
}

.document-icon {
    font-size: 2rem;
    margin-right: 1rem;
}

.document-title {
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    font-size: 1.1rem;
}

.document-meta {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.document-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
}

/* Search Bar */
.search-container {
    background: var(--card-background);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    margin-bottom: 2rem;
}

.search-input {
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    font-size: 1.1rem;
    transition: var(--transition);
    width: 100%;
}

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

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

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

/* Animations */
.content-section {
    animation: slideIn 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .upload-section {
        padding: 2rem 1rem;
    }
    
    .stats-number {
        font-size: 2rem;
    }
    
    .file-types-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .document-grid {
        grid-template-columns: 1fr;
    }
}

/* Loading States */
.loading-skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

/* Toast Notifications */
.toast {
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    border: none;
}

/* Connection Status */
.connection-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
    font-weight: 500;
}

.connection-status.disconnected {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

/* Upload Area Styles */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: 3rem 2rem;
    text-align: center;
    background-color: var(--card-background);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.02);
    transform: translateY(-2px);
}

.upload-area.dragover {
    border-color: var(--success-color);
    background: rgba(16, 185, 129, 0.05);
    transform: scale(1.02);
}

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

/* File Icons */
.file-icon {
    font-size: 1.5rem;
    margin-right: 0.5rem;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}