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

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #8b5cf6;
    --success: #10b981;
    --background: #0f172a;
    --surface: #1e293b;
    --surface-light: #334155;
    --text: #f1f5f9;
    --text-dim: #94a3b8;
    --border: #334155;
    --shadow: rgba(0, 0, 0, 0.3);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--background);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* Анимированный фон */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
}

.particles::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    position: relative;
    z-index: 1;
}

/* Header */
.header {
    padding: 30px 0;
    background: rgba(30, 41, 59, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    animation: slideDown 0.6s ease-out;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 28px;
    font-weight: bold;
}

.logo-icon-img {
    height: 40px;
    width: auto;
    animation: float 3s ease-in-out infinite;
}

.logo-university {
    height: 45px;
    width: auto;
    margin-left: auto;
    opacity: 0.9;
    transition: opacity 0.3s ease;
}

.logo-university:hover {
    opacity: 1;
}

.logo-icon {
    font-size: 36px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

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

.logo-author {
    color: var(--text-dim);
    font-size: 16px;
    font-weight: normal;
    margin-left: 8px;
}

.header-subtitle {
    color: var(--text-dim);
    font-size: 16px;
}

/* Main */
.main {
    flex: 1;
    padding: 60px 0;
}

/* Upload Section */
.upload-section {
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.upload-card {
    background: rgba(30, 41, 59, 0.6);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 60px 40px;
    text-align: center;
    border: 1px solid var(--border);
    box-shadow: 0 20px 60px var(--shadow);
}

.upload-icon {
    font-size: 64px;
    margin-bottom: 20px;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.upload-title {
    font-size: 36px;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.upload-description {
    color: var(--text-dim);
    font-size: 18px;
    margin-bottom: 40px;
}

.upload-zone {
    background: var(--surface);
    border: 3px dashed var(--border);
    border-radius: 16px;
    padding: 60px 40px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.upload-zone::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.2), transparent);
    transition: left 0.5s ease;
}

.upload-zone:hover::before {
    left: 100%;
}

.upload-zone:hover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
    transform: scale(1.02);
}

.upload-zone.dragover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
    transform: scale(1.02);
}

.upload-icon-large {
    font-size: 72px;
    margin-bottom: 20px;
    animation: pulse 2s ease-in-out infinite;
}

.upload-text {
    font-size: 20px;
    margin-bottom: 8px;
}

.upload-hint {
    color: var(--text-dim);
    font-size: 14px;
}

/* Progress */
.progress-container {
    margin-top: 30px;
    animation: fadeIn 0.3s ease-out;
}

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

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--surface);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 12px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 10px;
    transition: width 0.3s ease;
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { background-position: -1000px 0; }
    100% { background-position: 1000px 0; }
}

.progress-text {
    color: var(--text-dim);
    font-size: 14px;
}

/* Viewer Section */
.viewer-section {
    animation: fadeInUp 0.8s ease-out;
}

.viewer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 20px;
}

.file-info {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 600;
}

.file-icon {
    font-size: 32px;
}

.btn-new {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    padding: 14px 28px;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-new:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.4);
}

.btn-new:active {
    transform: translateY(0);
}

/* Tables Navigation */
.tables-nav {
    display: flex;
    gap: 12px;
    margin-bottom: 30px;
    overflow-x: auto;
    padding-bottom: 12px;
}

.tables-nav::-webkit-scrollbar {
    height: 8px;
}

.tables-nav::-webkit-scrollbar-track {
    background: var(--surface);
    border-radius: 10px;
}

.tables-nav::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 10px;
}

.table-tab {
    background: var(--surface);
    color: var(--text);
    border: 2px solid transparent;
    padding: 12px 24px;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
    animation: slideIn 0.4s ease-out backwards;
}

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

.table-tab:hover {
    background: var(--surface-light);
    transform: translateY(-2px);
}

.table-tab.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-color: var(--primary);
}

/* Table Container */
.table-container {
    background: rgba(30, 41, 59, 0.6);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 30px;
    border: 1px solid var(--border);
    box-shadow: 0 20px 60px var(--shadow);
}

.table-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 16px;
}

.table-title {
    font-size: 28px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.table-stats {
    color: var(--text-dim);
    font-size: 16px;
}

.table-wrapper {
    position: relative;
    min-height: 400px;
}

.loader {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.loader-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--surface-light);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 16px;
}

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

.table-scroll {
    overflow-x: auto;
    border-radius: 12px;
}

.table-scroll::-webkit-scrollbar {
    height: 12px;
}

.table-scroll::-webkit-scrollbar-track {
    background: var(--surface);
    border-radius: 10px;
}

.table-scroll::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 10px;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 15px;
}

.data-table thead {
    background: var(--surface);
    position: sticky;
    top: 0;
    z-index: 10;
}

.data-table th {
    padding: 16px 20px;
    text-align: left;
    font-weight: 600;
    color: var(--primary);
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
}

.data-table tbody tr {
    transition: all 0.2s ease;
    animation: fadeIn 0.5s ease-out backwards;
}

.data-table tbody tr:nth-child(even) {
    background: rgba(51, 65, 85, 0.3);
}

.data-table tbody tr:hover {
    background: rgba(99, 102, 241, 0.1);
    transform: scale(1.01);
}

.data-table td {
    padding: 14px 20px;
    border-bottom: 1px solid var(--border);
}

/* Footer */
.footer {
    padding: 30px 0;
    text-align: center;
    background: rgba(30, 41, 59, 0.8);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--border);
    color: var(--text-dim);
}

/* Responsive */
@media (max-width: 768px) {
    .logo {
        font-size: 20px;
        gap: 8px;
    }
    
    .logo-icon-img {
        height: 30px;
    }
    
    .logo-university {
        height: 32px;
    }
    
    .logo-author {
        font-size: 13px;
        display: none; /* Скрываем автора на мобильных для экономии места */
    }
    
    .upload-card {
        padding: 40px 20px;
    }
    
    .upload-title {
        font-size: 28px;
    }
    
    .viewer-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .table-container {
        padding: 20px;
    }
    
    .data-table th,
    .data-table td {
        padding: 12px 16px;
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    .logo {
        flex-wrap: wrap;
        gap: 6px;
    }
    
    .logo-university {
        margin-left: 0;
        margin-top: 8px;
    }
}