/* =============================================
   DataCleaner - Modern CSV Cleaning Tool
   ============================================= */

:root {
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --bg: #f1f5f9;
    --card-bg: #ffffff;
    --border: #e2e8f0;
    --text: #334155;
    --text-muted: #94a3b8;
    --table-header: #1e293b;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
    --radius: 8px;
    --radius-lg: 12px;
}

*, *::before, *::after {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 15px;
    overflow: hidden;
}

/* ---- App Navbar ---- */
.app-navbar {
    height: 48px;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    display: flex;
    align-items: center;
    padding: 0 1.25rem;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
    z-index: 100;
    position: relative;
}

.app-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #fff;
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.app-brand i {
    font-size: 1.3rem;
}

/* ---- Upload Section ---- */
#uploadSection {
    display: flex;
    align-items: center;
    justify-content: center;
    height: calc(100vh - 48px);
    padding: 2rem;
    overflow: auto;
}

.upload-wrapper {
    width: 100%;
    max-width: 560px;
}

.drop-zone {
    padding: 3.5rem 2rem;
    border: 3px dashed var(--border);
    border-radius: var(--radius-lg);
    background: var(--card-bg);
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

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

.drop-zone.drag-over {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.04);
    transform: scale(1.02);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15), var(--shadow-lg);
}

.upload-icon {
    font-size: 4rem;
    color: var(--primary);
    display: block;
    margin-bottom: 0.5rem;
}

.drop-zone h3 {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

/* ---- Tool Layout ---- */
.tool-layout {
    display: flex;
    height: calc(100vh - 48px);
}

/* ---- Main Content ---- */
.tool-main {
    flex: 1;
    overflow-y: auto;
    padding: 1rem 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

/* ---- Toolbar ---- */
.toolbar-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 0.75rem 1rem;
    box-shadow: var(--shadow);
}

.toolbar-top {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.search-wrapper {
    position: relative;
    flex: 1;
    min-width: 200px;
}

.search-icon {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.85rem;
    pointer-events: none;
}

.search-input {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.4rem 2rem 0.4rem 2rem;
    font-size: 0.875rem;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    background: var(--bg);
}

.search-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.12);
    background: #fff;
}

.search-clear {
    position: absolute;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 2px 4px;
    font-size: 0.9rem;
    line-height: 1;
}

.search-clear:hover {
    color: var(--danger);
}

.toolbar-controls {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.filename-group {
    max-width: 220px;
}

.toolbar-stats {
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border);
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ---- Columns Section ---- */
.columns-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 0.75rem 1rem;
    box-shadow: var(--shadow);
}

.columns-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.6rem;
}

.columns-title {
    font-weight: 600;
    font-size: 1rem;
}

.columns-actions {
    display: flex;
    gap: 0.3rem;
}

.btn-xs {
    padding: 0.2rem 0.6rem;
    font-size: 0.8rem;
    border-radius: 4px;
}

.columns-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    max-height: 280px;
    overflow-y: auto;
    padding: 0.25rem 0;
}

/* ---- Column Card ---- */
.column-card {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.65rem;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    user-select: none;
    transition: all 0.2s ease;
    font-size: 0.9rem;
}

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

.column-card.unselected {
    opacity: 0.45;
    background: #fff;
}

.column-card.highlight {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
    animation: colPulse 0.6s ease-in-out 3;
}

@keyframes colPulse {
    0%, 100% { box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2); }
    50% { box-shadow: 0 0 0 8px rgba(99, 102, 241, 0); }
}

.column-card .drag-handle {
    cursor: grab;
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1;
    opacity: 0.6;
}

.column-card .drag-handle:active {
    cursor: grabbing;
}

.column-card .form-check-input {
    margin: 0;
    cursor: pointer;
}

.column-card .col-name {
    font-weight: 500;
    max-width: 200px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.col-actions {
    display: flex;
    gap: 0.15rem;
    margin-left: 0.1rem;
}

.col-actions button {
    background: none;
    border: none;
    padding: 0.1rem 0.3rem;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 0.85rem;
    border-radius: 3px;
    line-height: 1;
    transition: all 0.15s;
}

.col-actions button:hover {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
}

.col-actions button.has-filter {
    color: var(--primary);
    background: rgba(99, 102, 241, 0.08);
}

.col-actions .btn-col-remove:hover {
    color: var(--danger);
    background: rgba(239, 68, 68, 0.1);
}

.filter-count-badge {
    background: var(--primary);
    color: #fff;
    font-size: 0.65rem;
    border-radius: 50%;
    width: 16px;
    height: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-left: -0.15rem;
    font-weight: 700;
}

/* SortableJS states */
.column-card.sortable-ghost {
    opacity: 0.3;
}

.column-card.sortable-chosen {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.column-card.sortable-drag {
    box-shadow: var(--shadow-lg);
}

/* ---- Preview Section ---- */
.preview-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 200px;
    overflow: hidden;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.6rem 1rem;
    border-bottom: 1px solid var(--border);
    font-weight: 600;
    font-size: 1rem;
    flex-shrink: 0;
}

.preview-table-wrapper {
    flex: 1;
    overflow: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.data-table thead th {
    background: var(--table-header);
    color: #fff;
    padding: 0.5rem 0.75rem;
    position: sticky;
    top: 0;
    z-index: 2;
    white-space: nowrap;
    font-weight: 500;
    border-right: 1px solid rgba(255,255,255,0.08);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.data-table tbody td {
    padding: 0.35rem 0.75rem;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
    max-width: 220px;
    overflow: hidden;
    text-overflow: ellipsis;
}

.data-table tbody tr:nth-child(even) {
    background: rgba(241, 245, 249, 0.5);
}

.data-table tbody tr:hover {
    background: rgba(99, 102, 241, 0.04);
}

/* ---- Filter Modal ---- */
.filter-values-container {
    max-height: 400px;
    overflow-y: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.25rem;
}

.filter-value-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.3rem 0.5rem;
    border-radius: 4px;
    transition: background 0.15s;
}

.filter-value-item:hover {
    background: var(--bg);
}

.filter-value-item label {
    cursor: pointer;
    margin: 0;
    font-size: 0.875rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
}

.filter-value-item .form-check-input {
    margin: 0;
    flex-shrink: 0;
}

/* ---- Custom Scrollbars ---- */
::-webkit-scrollbar {
    width: 14px;
    height: 14px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--table-header);
    border-radius: 7px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

::-webkit-scrollbar-corner {
    background: transparent;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
    .tool-layout {
        flex-direction: column;
    }

    .toolbar-top {
        flex-direction: column;
        align-items: stretch;
    }

    .toolbar-controls {
        justify-content: flex-start;
    }

    .search-wrapper {
        min-width: unset;
    }

    .columns-grid {
        max-height: 200px;
    }
}