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

:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --bg-card: #1a1a1a;
    --bg-hover: #222222;
    --bg-active: #2a2a2a;
    --border-color: #2a2a2a;
    --text-primary: #e8e8e8;
    --text-secondary: #888888;
    --text-muted: #555555;
    --accent: #4a9eff;
    --accent-hover: #6ab0ff;
    --accent-dark: #3a7fd4;
    --danger: #ff4757;
    --danger-hover: #ff6b7a;
    --success: #2ed573;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.8);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
}

.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 240px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 8px 24px 8px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 24px;
}

.logo svg {
    color: var(--accent);
}

.logo span {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.2s ease;
    font-size: 14px;
    font-weight: 500;
}

.nav-item svg {
    color: currentColor;
    flex-shrink: 0;
}

.nav-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--bg-active);
    color: var(--accent);
}

.sidebar-footer {
    border-top: 1px solid var(--border-color);
    padding-top: 16px;
    margin-top: auto;
}

.status {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-secondary);
}

.status-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--success);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.version {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 4px;
    padding-left: 14px;
}

/* Main Content */
.main-content {
    margin-left: 240px;
    flex: 1;
    padding: 0;
    min-height: 100vh;
}

.top-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 32px 40px 24px 40px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.header-left h1 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 4px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 14px;
}

.header-right {
    display: flex;
    gap: 8px;
}

.btn-icon {
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-color);
    background: transparent;
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.btn-icon:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--accent);
}

.content-body {
    padding: 24px 40px 40px 40px;
}

/* Upload Section */
.upload-section {
    margin-bottom: 24px;
}

.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 60px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    background: var(--bg-card);
}

.drop-zone:hover {
    border-color: var(--accent);
    background: var(--bg-hover);
}

.drop-zone.dragover {
    border-color: var(--accent);
    background: rgba(74, 158, 255, 0.05);
    transform: scale(1.01);
}

.drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.upload-icon {
    color: var(--text-muted);
    transition: all 0.3s ease;
}

.drop-zone:hover .upload-icon {
    color: var(--accent);
}

.drop-zone-content p {
    font-size: 16px;
    color: var(--text-secondary);
}

.drop-zone-content small {
    color: var(--text-muted);
    font-size: 13px;
}

#fileInput {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

/* Controls */
.controls {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 20px 24px;
    margin-bottom: 24px;
    border: 1px solid var(--border-color);
}

.controls-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-items: flex-end;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.control-group label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.control-group select,
.control-group input {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: all 0.2s ease;
    min-width: 120px;
}

.control-group select:focus,
.control-group input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(74, 158, 255, 0.1);
}

.control-group input {
    width: 60px;
}

.control-group select option {
    background: var(--bg-secondary);
}

.actions {
    flex: 1;
    display: flex;
    flex-direction: row;
    gap: 8px;
    justify-content: flex-end;
}

.btn {
    padding: 8px 20px;
    border: none;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(74, 158, 255, 0.3);
}

.btn-secondary {
    background: var(--bg-hover);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-active);
    border-color: var(--text-secondary);
}

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

.btn-danger:hover {
    background: var(--danger-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(255, 71, 87, 0.3);
}

/* Stats */
.stats {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px 24px;
    margin-bottom: 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 16px;
}

.stat-item {
    font-size: 13px;
    color: var(--text-secondary);
}

.stat-item span {
    color: var(--text-primary);
    font-weight: 600;
}

/* Table */
.table-wrapper {
    border-radius: 12px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    background: var(--bg-card);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

table thead {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

table th {
    padding: 14px 20px;
    text-align: left;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: sticky;
    top: 0;
    z-index: 10;
    white-space: nowrap;
}

table td {
    padding: 12px 20px;
    border-bottom: 1px solid var(--border-color);
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--text-primary);
}

table tbody tr:hover {
    background: var(--bg-hover);
}

table tbody tr:nth-child(even) {
    background: rgba(255, 255, 255, 0.02);
}

table tbody tr:nth-child(even):hover {
    background: var(--bg-hover);
}

/* JSON Viewer */
.json-viewer {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: 12px;
    font-family: 'Courier New', monospace;
    font-size: 13px;
    overflow-x: auto;
    max-height: 600px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
}

.json-viewer pre {
    color: var(--text-primary);
}

/* Error */
.error {
    background: rgba(255, 71, 87, 0.1);
    color: var(--danger);
    padding: 16px 20px;
    border-radius: 12px;
    border: 1px solid rgba(255, 71, 87, 0.2);
    margin-top: 20px;
}

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

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 60px;
        padding: 16px 8px;
    }

    .logo span,
    .nav-item span,
    .sidebar-footer .status,
    .sidebar-footer .version {
        display: none;
    }

    .nav-item {
        justify-content: center;
        padding: 12px;
    }

    .main-content {
        margin-left: 60px;
    }

    .top-header {
        padding: 20px;
        flex-direction: column;
        gap: 12px;
    }

    .content-body {
        padding: 16px;
    }

    .controls-grid {
        flex-direction: column;
        align-items: stretch;
    }

    .actions {
        flex-wrap: wrap;
        justify-content: stretch;
    }

    .actions .btn {
        flex: 1;
        text-align: center;
    }

    .stats {
        grid-template-columns: 1fr;
    }

    table {
        font-size: 12px;
    }

    table th,
    table td {
        padding: 8px 12px;
    }
}

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

#dataContainer {
    animation: fadeIn 0.3s ease;
}

/* Loading State */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px;
    gap: 12px;
}

.loading-spinner {
    width: 24px;
    height: 24px;
    border: 2px solid var(--border-color);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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