/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --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 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --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);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--gray-100);
    color: var(--gray-800);
    line-height: 1.6;
    min-height: 100vh;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--gray-200);
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-900);
}

/* Card */
.card {
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow);
    overflow: hidden;
    margin-bottom: 24px;
}

.card-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--gray-100);
}

.card-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 4px;
}

.card-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-900);
}

.card-header p {
    color: var(--gray-500);
    font-size: 0.875rem;
}

.card-body {
    padding: 24px;
}

/* Login Card */
.login-card {
    max-width: 400px;
    margin: 100px auto;
}

.login-card .card-header {
    text-align: center;
    padding: 32px 24px;
    background: linear-gradient(135deg, var(--primary-color), #6366f1);
    border-bottom: none;
}

.login-card .card-header h1 {
    color: white;
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.login-card .card-header p {
    color: rgba(255, 255, 255, 0.8);
}

/* Form */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 8px;
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--gray-300);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

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

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

.btn-primary:disabled {
    background-color: var(--gray-300);
    cursor: not-allowed;
}

.btn-outline {
    background-color: white;
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}

.btn-outline:hover {
    background-color: var(--gray-50);
}

.btn-text {
    background: none;
    color: var(--error-color);
    padding: 8px 12px;
}

.btn-text:hover {
    background-color: rgba(239, 68, 68, 0.1);
}

.btn-block {
    width: 100%;
}

/* Alert */
.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 0.875rem;
}

.alert-error {
    background-color: #fef2f2;
    color: var(--error-color);
    border: 1px solid #fecaca;
}

.alert-success {
    background-color: #ecfdf5;
    color: var(--success-color);
    border: 1px solid #a7f3d0;
}

/* Upload Zone */
.upload-zone {
    border: 2px dashed var(--gray-300);
    border-radius: 12px;
    padding: 48px 24px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 20px;
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--primary-color);
    background-color: rgba(79, 70, 229, 0.05);
}

.upload-icon {
    color: var(--gray-400);
    margin-bottom: 16px;
}

.upload-zone:hover .upload-icon,
.upload-zone.dragover .upload-icon {
    color: var(--primary-color);
}

.upload-text {
    font-size: 1rem;
    color: var(--gray-700);
    margin-bottom: 8px;
}

.upload-hint {
    font-size: 0.875rem;
    color: var(--gray-500);
}

/* File Info */
.file-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background-color: var(--gray-50);
    border-radius: 8px;
    margin-bottom: 20px;
}

.file-name {
    font-size: 0.875rem;
    color: var(--gray-700);
    font-weight: 500;
}

/* Column Tags */
.column-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 12px;
}

.tag {
    display: inline-block;
    padding: 4px 12px;
    background-color: var(--gray-100);
    color: var(--gray-700);
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
}

.info-note {
    font-size: 0.75rem;
    color: var(--gray-500);
}

/* Loading */
.loading {
    text-align: center;
    padding: 24px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 12px;
}

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

.loading p {
    color: var(--gray-500);
    font-size: 0.875rem;
}

/* Summary Cards */
.summary-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.summary-card {
    background: white;
    border-radius: 12px;
    padding: 24px;
    text-align: center;
    box-shadow: var(--shadow);
}

.summary-card.new {
    border-left: 4px solid var(--success-color);
}

.summary-card.changed {
    border-left: 4px solid var(--warning-color);
}

.summary-card.unchanged {
    border-left: 4px solid var(--gray-400);
}

.summary-number {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.summary-card.new .summary-number {
    color: var(--success-color);
}

.summary-card.changed .summary-number {
    color: var(--warning-color);
}

.summary-card.unchanged .summary-number {
    color: var(--gray-500);
}

.summary-label {
    font-size: 0.875rem;
    color: var(--gray-500);
}

/* Table */
.table-wrapper {
    overflow-x: auto;
    margin: -24px;
    padding: 24px;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.813rem;
    white-space: nowrap;
}

.data-table th {
    background-color: var(--gray-50);
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
    color: var(--gray-700);
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
}

.data-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--gray-100);
    color: var(--gray-700);
}

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

.row-new {
    background-color: rgba(16, 185, 129, 0.1);
}

.row-new td {
    color: #065f46;
}

.row-changed {
    background-color: rgba(245, 158, 11, 0.1);
}

.row-changed td {
    color: #92400e;
}

.row-unchanged {
    background-color: var(--gray-50);
}

.row-unchanged td {
    color: var(--gray-500);
}

.cell-changed {
    background-color: rgba(245, 158, 11, 0.2);
    font-weight: 600;
}

.old-value {
    font-size: 0.688rem;
    color: var(--gray-500);
    font-weight: 400;
    margin-top: 4px;
}

/* Collapsible */
.collapsible {
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.collapse-icon {
    font-size: 1.25rem;
    color: var(--gray-500);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 24px;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-content {
    background: white;
    padding: 32px 48px;
    border-radius: 12px;
    text-align: center;
}

.loading-content p {
    margin-top: 12px;
    color: var(--gray-600);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1001;
}

.modal-content {
    background: white;
    padding: 32px;
    border-radius: 12px;
    text-align: center;
    max-width: 400px;
    width: 90%;
}

.modal-icon {
    margin-bottom: 16px;
}

.modal-icon.success {
    color: var(--success-color);
}

.modal-icon.error {
    color: var(--error-color);
}

.modal-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.modal-content p {
    color: var(--gray-600);
    margin-bottom: 24px;
}

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

    .header {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }

    .summary-cards {
        grid-template-columns: 1fr;
    }

    .action-buttons {
        flex-direction: column;
    }

    .action-buttons .btn {
        width: 100%;
    }

    .login-card {
        margin: 40px auto;
    }

    .table-wrapper {
        margin: -24px -16px;
        padding: 24px 16px;
    }

    .data-table {
        font-size: 0.75rem;
    }

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

/* Info Card */
.info-card {
    background-color: var(--gray-50);
}

.info-card .card-body {
    padding: 16px 24px;
}

/* Exclude Button */
.th-action,
.td-action {
    width: 60px;
    text-align: center;
    position: sticky;
    left: 0;
    background: inherit;
}

.th-action {
    background-color: var(--gray-50);
}

.btn-exclude {
    width: 32px;
    height: 32px;
    border: 1px solid var(--error-color);
    background-color: white;
    color: var(--error-color);
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 600;
    transition: all 0.2s;
}

.btn-exclude:hover {
    background-color: var(--error-color);
    color: white;
}

.btn-exclude.btn-restore {
    border-color: var(--success-color);
    color: var(--success-color);
    font-size: 0.625rem;
}

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

/* Excluded Row */
tr.excluded {
    opacity: 0.4;
    text-decoration: line-through;
}

tr.excluded td {
    background-color: var(--gray-100) !important;
    color: var(--gray-500) !important;
}