/* Global Reset & Variables */
:root {
    --bg-app: #0f172a;
    --bg-sidebar: #1e293b;
    --bg-card: #283548;
    /* Lightened based on sidebar for contrast */
    --bg-card-hover: #334155;

    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --primary-color: #6366f1;
    /* Indigo 500 */
    --primary-hover: #4f46e5;
    --accent-color: #38bdf8;
    /* Sky 400 */
    --success-color: #22c55e;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;

    --border-color: #334155;
    --radius-lg: 16px;
    --radius-md: 8px;
    --radius-sm: 4px;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

    --bg-secondary: #2d3748;
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
}

body.light-mode {
    --bg-app: #f1f5f9;
    --bg-sidebar: #ffffff;
    --bg-card: #ffffff;
    --bg-card-hover: #f8fafc;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --bg-secondary: #f8fafc;
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px 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);
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-app);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
}

/* Layout */
.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
}


/* Sidebar (Left Panel) */
.sidebar {
    width: 350px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    flex-shrink: 0;
}

.brand {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 3rem;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
}

.brand h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.025em;
}

.input-section h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
}

.context-input-group {
    margin: 1.5rem 0;
}

.context-input-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.context-input-group textarea {
    width: 100%;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.75rem;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    resize: vertical;
    min-height: 100px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.context-input-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

/* Drop Zone */
.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2.5rem 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background-color: rgba(255, 255, 255, 0.02);
}

.drop-zone:hover,
.drop-zone.drag-active {
    border-color: var(--primary-color);
    background-color: rgba(99, 102, 241, 0.05);
}

.icon-container {
    font-size: 2.5rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.drop-zone p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.highlight {
    color: var(--primary-color);
    font-weight: 500;
}

/* File Info */
.file-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background-color: var(--bg-card);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    margin-top: 1rem;
    border: 1px solid var(--border-color);
}

.file-info i.fa-file-excel {
    color: var(--success-color);
    font-size: 1.25rem;
}

#file-name {
    flex: 1;
    font-size: 0.875rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.remove-file {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
}

.remove-file:hover {
    color: var(--danger-color);
}

/* Buttons */
.controls {
    margin-top: 2rem;
}

.btn-primary {
    width: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    border: none;
    padding: 0.875rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: transform 0.1s, opacity 0.2s;
    box-shadow: 0 4px 6px -1px rgba(99, 102, 241, 0.3);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    box-shadow: none;
}

.btn-primary:active {
    transform: scale(0.98);
}

.sample-data {
    margin-top: 1rem;
    text-align: center;
    font-size: 0.825rem;
}

.sample-data a {
    color: var(--accent-color);
    text-decoration: none;
}

.sample-data a:hover {
    text-decoration: underline;
}

.app-footer {
    color: var(--text-muted);
    font-size: 0.75rem;
    text-align: center;
    margin-top: auto;
}

/* Main Content (Right Panel) */
.main-content {
    flex: 1;
    background-color: var(--bg-app);
    padding: 2rem;
    overflow-y: auto;
    position: relative;
    transition: margin-left 0.3s ease;
}

/* Theme Toggle & Mobile Menu */
.sidebar-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.theme-toggle,
.mobile-menu-btn {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}

.theme-toggle:hover {
    background-color: var(--bg-card-hover);
    border-color: var(--primary-color);
}

.mobile-menu-btn {
    display: none;
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 1000;
}

/* Empty State */
.empty-state {
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--text-muted);
}

.illustration {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    color: var(--bg-card-hover);
}

.empty-state h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

/* Dashboard */
.dashboard-header {
    margin-bottom: 2rem;
}

.stats-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.stat-card {
    background-color: var(--bg-card);
    padding: 1.25rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.stat-card .label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.stat-card .value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-card .value.success {
    color: var(--success-color);
}

.stat-card .value.warning {
    color: var(--warning-color);
}

.stat-card .value.danger {
    color: var(--danger-color);
}

/* View Controls */
.view-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0px;
}

.view-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

.view-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    font-weight: 500;
}

.view-btn:hover:not(.active) {
    color: var(--text-primary);
}

/* View Panes */
.view-pane {
    display: none;
    animation: fadeIn 0.3s ease;
}

.view-pane.active {
    display: block;
}

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

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

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

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

th,
td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: rgba(0, 0, 0, 0.2);
    color: var(--text-secondary);
    font-weight: 500;
}

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

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

/* Utility */
.hidden {
    display: none !important;
}

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

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

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

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

/* Gantt Chart Styles */
.gantt-container {
    padding: 1rem 0;
    overflow-x: auto;
}

.gantt-timescale {
    display: flex;
    align-items: flex-end;
    margin-bottom: 0.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.gantt-timeline {
    display: flex;
    flex: 1;
    position: relative;
    /* Essential for absolute children */
}


.iter-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 0.25rem;
}

.week-labels {
    display: flex;
    justify-content: space-around;
    font-size: 0.65rem;
    color: var(--text-muted);
}

.gantt-row {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.timescale-iter {
    flex: 0 0 auto;
    position: absolute;
    bottom: 0;
    top: 5px;
    /* Stick to top */
    border-left: 1px solid var(--border-color);
    padding-left: 4px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    pointer-events: none;
    /* Let clicks pass through */
}

.gantt-label {
    width: 120px;
    flex-shrink: 0;
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-right: 1rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.gantt-track {
    flex: 1;
    position: relative;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-sm);
    min-width: 600px;
    /* Ensure scrolling on small screens */
}

.gantt-bar {
    position: absolute;
    height: 24px;
    top: 8px;
    /* Center in track */
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 4px;
    font-size: 0.75rem;
    color: white;
    display: flex;
    align-items: center;
    padding: 0 8px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    cursor: pointer;
    transition: transform 0.2s;
}

.gantt-bar:hover {
    transform: scale(1.02);
    z-index: 10;
}

.priority-boosted {
    background-color: rgba(99, 102, 241, 0.1) !important;
    border-left: 4px solid var(--primary-color);
}

.bar-boosted {
    background: linear-gradient(90deg, var(--warning-color), var(--primary-color)) !important;
    box-shadow: 0 0 10px rgba(245, 158, 11, 0.4);
}

/* Analysis View */
.analysis-container {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: 2rem;
}

.analysis-score-card {
    display: flex;
    align-items: center;
    gap: 2rem;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.score-circle {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--bg-app);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    border: 4px solid var(--primary-color);
}

.score-circle.success {
    border-color: var(--success-color);
    color: var(--success-color);
}

.score-circle.warning {
    border-color: var(--warning-color);
    color: var(--warning-color);
}

.score-circle.danger {
    border-color: var(--danger-color);
    color: var(--danger-color);
}

.analysis-details h3 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.risk-list {
    list-style: none;
}

.risk-item {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
    padding: 1rem;
    background-color: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--text-secondary);
}

.risk-item.danger {
    border-left-color: var(--danger-color);
}

.risk-item.warning {
    border-left-color: var(--warning-color);
}

.risk-item.success {
    border-left-color: var(--success-color);
}

.risk-icon {
    font-size: 1.25rem;
}

.risk-content h4 {
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
}

.risk-content p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.warn {
    color: var(--danger-color);
    font-weight: 500;
}

.badge-status {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    white-space: nowrap;
    border: 1px solid var(--border-color);
}

/* Responsiveness */
@media (max-width: 1024px) {
    .sidebar {
        width: 300px;
    }
}

@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }

    .sidebar {
        position: fixed;
        left: -100%;
        top: 0;
        bottom: 0;
        z-index: 999;
        width: 280px;
        transition: left 0.3s ease;
        box-shadow: var(--shadow-lg);
        padding: 1.5rem;
    }

    .sidebar.active {
        left: 0;
    }

    .mobile-menu-btn {
        display: flex;
        background: var(--bg-card);
        border: 1px solid var(--border-color);
        color: var(--text-primary);
        width: 36px;
        height: 36px;
        border-radius: var(--radius-md);
        align-items: center;
        justify-content: center;
        cursor: pointer;
        z-index: 1000;
        position: fixed;
        top: 1rem;
        left: 1rem;
    }

    .main-content {
        padding: 4rem 1rem 1rem 1rem;
    }

    .stats-cards {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    .gantt-label {
        width: 80px;
        font-size: 0.7rem;
    }

    .view-controls {
        overflow-x: auto;
        white-space: nowrap;
        -webkit-overflow-scrolling: touch;
    }
}

@media (max-width: 480px) {
    .stats-cards {
        grid-template-columns: 1fr;
    }

    .brand h1 {
        font-size: 1.25rem;
    }
}

.stats-dashboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    padding: 1rem;
}

.chart-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    height: 400px;
    /* Fixed height to prevent resize loops */
    position: relative;
}

.chart-container.wide {
    grid-column: 1 / -1;
}

.chart-container h3 {
    font-size: 1rem;
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
    font-weight: 600;
}

/* Ensure canvas is responsive */
canvas {
    max-width: 100%;
}

/* Export Button */
.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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