/* CSS Variables for Premium Theme */
:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --success-color: #10b981;
    --success-hover: #059669;
    --danger-color: #ef4444;
    --text-main: #111827;
    --text-muted: #6b7280;
    --bg-main: #f3f4f6;
    --bg-card: #ffffff;
    --border-color: #e5e7eb;
    --border-focus: #a5b4fc;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius-md: 10px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Layout */
.app-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-card);
    padding: 1rem 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo i {
    font-size: 2rem;
    color: var(--primary-color);
    background: #e0e7ff;
    padding: 0.5rem;
    border-radius: var(--radius-md);
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-main);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-role {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
}

.avatar {
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

/* Cards */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 2rem;
    transition: var(--transition);
}

.card-header {
    margin-bottom: 1.5rem;
}

.card-header h2 {
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-header p {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

/* Content Layout */
.filter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.mb-4 {
    margin-bottom: 2rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-main);
}

.text-danger {
    color: var(--danger-color);
}

.form-control {
    padding: 0.6rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: #fff;
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition);
    font-family: inherit;
    color: var(--text-main);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--border-focus);
}

/* Upload Area */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 3rem 2rem;
    text-align: center;
    background: #f9fafb;
    transition: var(--transition);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--primary-color);
    background: #e0e7ff;
}

.upload-icon i {
    font-size: 4rem;
    color: var(--primary-color);
    opacity: 0.8;
}

.file-name {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
    word-break: break-all;
}

.upload-actions {
    margin-top: 2rem;
}

/* Buttons */
.btn {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.btn-large {
    padding: 0.8rem 1.5rem;
    font-size: 1.05rem;
}

.w-100 {
    width: 100%;
}

.mt-2 {
    margin-top: 1rem;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.flex-between {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

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

.btn-success:hover {
    background: var(--success-hover);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-main);
}

.btn-outline:hover {
    background: var(--bg-main);
    border-color: var(--text-muted);
}

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

.opacity-50 {
    opacity: 0.5;
}

/* Status */
.status-message {
    margin-top: 1rem;
    text-align: center;
    font-size: 0.9rem;
    padding: 0.75rem;
    border-radius: var(--radius-md);
    display: none;
}

.status-success {
    display: block;
    background: #d1fae5;
    color: #065f46;
}

.status-error {
    display: block;
    background: #fee2e2;
    color: #991b1b;
}

/* Table */
.preview-card {
    display: none;
}

.preview-card.active-section {
    display: block;
    animation: fadeIn 0.4s ease forwards;
}

.upload-card.hidden-section {
    display: none;
}

.table-responsive {
    overflow-x: auto;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

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

.data-table th,
.data-table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
}

.data-table th {
    background: #f9fafb;
    font-weight: 600;
    color: var(--text-muted);
    position: sticky;
    top: 0;
}

.data-table tbody tr:hover {
    background: #f3f4f6;
}

.data-table td.editable {
    cursor: pointer;
    transition: var(--transition);
}

.data-table td.editable:hover {
    background: #eef2ff;
    box-shadow: inset 0 0 0 1px var(--primary-color);
}

.data-table td input {
    width: 100%;
    border: 1px solid var(--primary-color);
    border-radius: 4px;
    padding: 0.25rem 0.5rem;
    outline: none;
    font-size: 0.9rem;
    font-family: inherit;
    background: #fff;
}

.data-table td.invalid-cell {
    background-color: #fee2e2 !important;
    color: var(--danger-color);
    font-weight: 500;
    box-shadow: inset 0 0 0 2px var(--danger-color);
}

.data-table td.invalid-cell:hover {
    background-color: #fca5a5 !important;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}