/* ============================================
   СОВРЕМЕННЫЙ ПРОФЕССИОНАЛЬНЫЙ ДИЗАЙН
   ============================================ */

:root {
    --primary: #3B82F6;
    --primary-dark: #1E40AF;
    --primary-light: #DBEAFE;
    --secondary: #8B5CF6;
    --success: #10B981;
    --danger: #EF4444;
    --warning: #F59E0B;
    --info: #06B6D4;
    
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;
    
    --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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--gray-50);
    color: var(--gray-900);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============== NAVBAR ============== */
.navbar {
    background: linear-gradient(135deg, #FFFFFF 0%, #F8FAFC 100%);
    border-bottom: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary-dark);
    text-decoration: none;
}

.logo {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 1.1rem;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.brand-title {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ============== SEARCH CARD ============== */
.search-card {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 2.5rem;
    background: linear-gradient(135deg, #FFFFFF 0%, #F8FBFF 100%);
    border-radius: 20px;
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-xl);
    transition: all 0.3s ease;
}

.search-card:hover {
    box-shadow: var(--shadow-2xl);
    border-color: var(--primary-light);
}

.search-row {
    display: flex;
    gap: 1rem;
    align-items: center;
}

#search-input {
    flex: 1;
    height: 56px;
    border-radius: 14px;
    border: 2px solid var(--gray-200);
    padding: 0 1.25rem;
    font-size: 1rem;
    color: var(--gray-900);
    background-color: white;
    transition: all 0.3s ease;
}

#search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

#search-input::placeholder {
    color: var(--gray-400);
}

/* ============== BUTTONS ============== */
.btn {
    border-radius: 12px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, #2563EB 100%);
    color: white;
    padding: 0.75rem 1.5rem;
    height: 56px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(59, 130, 246, 0.3);
}

.btn-outline-secondary {
    border: 2px solid var(--gray-300);
    color: var(--gray-700);
    background: white;
}

.btn-outline-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
}

/* ============== RESULT ITEMS ============== */
#search-results {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.result-item {
    padding: 1.5rem;
    background: white;
    border-radius: 14px;
    border: 2px solid var(--gray-200);
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    cursor: pointer;
}

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

.result-item.selected {
    border-color: var(--primary);
    background: var(--primary-light);
}

.result-item h5 {
    color: var(--primary-dark);
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.result-item small {
    color: var(--gray-500);
    font-size: 0.875rem;
}

.snippet {
    color: var(--gray-700);
    margin-top: 1rem;
    line-height: 1.7;
    background: var(--gray-50);
    padding: 1rem;
    border-radius: 8px;
    border-left: 3px solid var(--primary);
}

.snippet .hl {
    background: linear-gradient(120deg, #FCD34D 0%, #FBBF24 100%);
    padding: 0 6px;
    border-radius: 6px;
    color: var(--gray-900);
    font-weight: 600;
}

/* ============== CARDS ============== */
.card {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.card-header {
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--gray-100) 100%);
    border-bottom: 1px solid var(--gray-200);
    padding: 1.5rem;
    font-weight: 700;
    color: var(--primary-dark);
    border-radius: 16px 16px 0 0;
}

.card-body {
    padding: 2rem;
}

/* ============== SIDEBAR TABS ============== */
.side-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--gray-200);
}

.tab-btn {
    flex: 1;
    padding: 0.875rem 1rem;
    background: white;
    border: none;
    color: var(--gray-500);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: 8px 8px 0 0;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
}

.tab-btn:hover {
    color: var(--primary);
    background: var(--primary-light);
}

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

.panel {
    display: none;
    animation: fadeIn 0.3s ease;
}

.panel.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ============== ANIMATIONS ============== */
@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-item {
    animation: slideInUp 0.4s ease;
}

/* ============== FORMS ============== */
.form-control, .form-select {
    border-radius: 10px;
    border: 2px solid var(--gray-200);
    padding: 0.75rem 1rem;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* ============== RESPONSIVE ============== */
@media (max-width: 768px) {
    .search-row {
        flex-direction: column;
    }

    .search-card {
        padding: 1.5rem;
        margin: 1rem;
    }

    .card-body {
        padding: 1.25rem;
    }

    .container-fluid {
        padding: 0.75rem;
    }

    .navbar .ms-auto {
        display: none;
    }

    .search-card {
        padding: 14px;
    }

    #search-input {
        height: 48px;
    }

    .search-row {
        flex-direction: column;
        align-items: stretch;
    }

    .result-item {
        padding: 1rem;
    }

    .snippet {
        padding: 0.75rem;
        font-size: 0.9rem;
    }
}

/* Filter Buttons */
.filter {
    transition: all 0.3s ease;
}

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

/* Smooth transitions */
* {
    transition-property: background-color, border-color, color, box-shadow, transform;
    transition-duration: 0.3s;
    transition-timing-function: ease;
}

/* Loading spinner */
.spinner {
    display: inline-block;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Upload styles */
.upload-drop-area {
    border: 2px dashed var(--gray-300);
    border-radius: 16px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--gray-50);
}

.upload-drop-area:hover,
.upload-drop-area.dragover {
    border-color: var(--primary);
    background: rgba(59, 130, 246, 0.05);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.15);
}

/* Utility classes */
.muted {
    color: #64748b;
}

.card-with-shadow {
    box-shadow: 0 8px 30px rgba(2, 6, 23, 0.6);
}

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

::-webkit-scrollbar-track {
    background: var(--gray-100);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-400);
}