/*
 * =============================================================================
 * SOLVERFORGE QUICKSTART TEMPLATE - APP STYLES
 * =============================================================================
 *
 * Custom styles for the quickstart template UI.
 * This file creates the "code-link" educational UI appearance.
 *
 * CUSTOMIZATION GUIDE:
 * - Brand colors: Change #10b981 (green) and #3E00FF (violet)
 * - Card styles: Modify .kpi-card, .task-card, .resource-card
 * - Animations: Adjust @keyframes rules for different effects
 *
 * SECTIONS:
 * 1. Global styles
 * 2. Interactive Code clickable elements (code reveal on hover)
 * 3. Hero section (gradient banner)
 * 4. KPI cards (metrics display)
 * 5. Control bar (solve/stop buttons)
 * 6. Section cards (container panels)
 * 7. Task cards (planning entity visualization)
 * 8. Resource cards (problem fact visualization)
 * 9. Constraint legend (clickable constraint badges)
 * 10. Build tab (file navigator and code viewer)
 * 11. Navigation overrides
 * 12. Responsive adjustments
 */

/* =============================================================================
 * 1. GLOBAL STYLES
 *
 * Base styles for the page. The light gray background (#f8fafc) provides
 * contrast for white cards.
 * ============================================================================= */
body {
    background: #f8fafc;
}

/* =============================================================================
 * 2. INTERACTIVE CODE CLICKABLE ELEMENTS
 *
 * The "code-link" feature: every UI element shows a code icon on hover,
 * indicating it can be clicked to view the source code that generates it.
 *
 * HOW IT WORKS:
 * 1. Add class="code-link" to any element
 * 2. Add data-target="filename:section" to specify the code location
 * 3. CSS ::after pseudo-element creates the code icon
 * 4. JavaScript handles click -> navigates to Build tab
 *
 * EXAMPLE:
 * <div class="kpi-card code-link" data-target="app.js:updateKPIs">
 *   <span class="code-tooltip">updateKPIs() in app.js</span>
 *   ...content...
 * </div>
 * ============================================================================= */
.code-link {
    position: relative;
    cursor: pointer;
    transition: all 0.2s ease;
}

/* Code icon that appears on hover (uses Font Awesome code icon) */
.code-link::after {
    content: '\f121'; /* fa-code unicode */
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    top: 4px;
    right: 4px;
    width: 20px;
    height: 20px;
    background: rgba(62, 0, 255, 0.9); /* SolverForge violet */
    color: white;
    border-radius: 4px;
    font-size: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: scale(0.8);
    transition: all 0.2s ease;
}

.code-link:hover::after {
    opacity: 1;
    transform: scale(1);
}

/* Violet glow border on hover to indicate clickability */
.code-link:hover {
    box-shadow: 0 0 0 2px rgba(62, 0, 255, 0.5);
}

/* Tooltip that appears above code-link elements */
.code-tooltip {
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    background: #1f2937;
    color: white;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 12px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease;
    z-index: 1000;
    pointer-events: none;
}

/* Tooltip arrow */
.code-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: #1f2937;
}

.code-link:hover .code-tooltip {
    opacity: 1;
    visibility: visible;
}

/* =============================================================================
 * 3. HERO SECTION
 *
 * The prominent banner at the top of the Demo tab. Uses a gradient from
 * SolverForge violet to green, with a rotating shimmer effect.
 *
 * TODO: Update the gradient colors to match your brand or problem domain.
 * ============================================================================= */
.hero-section {
    background: linear-gradient(135deg, #2E1760 0%, #3E00FF 50%, #10b981 100%);
    position: relative;
    overflow: hidden;
    border-radius: 16px;
    padding: 2rem;
}

/* Animated shimmer effect - creates visual interest */
.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: shimmer 15s infinite linear;
}

@keyframes shimmer {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Small badge above the hero title */
.hero-badge {
    background: rgba(255,255,255,0.2);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    display: inline-block;
    margin-bottom: 1rem;
}

/* =============================================================================
 * 4. KPI CARDS
 *
 * Key Performance Indicator cards show solution metrics at a glance.
 *
 * DEFAULT KPIs (customize for your domain):
 * - Total Tasks: Count of planning entities
 * - Assigned: Count with non-null planning variable
 * - Violations: Count of hard constraint violations
 * - Score: The HardSoftScore from the solver
 *
 * COLOR CODING:
 * - Purple (#6366f1): Neutral/informational
 * - Green (#10b981): Positive/success
 * - Red (#ef4444): Negative/violations
 * - Violet (#3E00FF): Score/brand
 * ============================================================================= */
.kpi-card {
    background: white;
    border-radius: 12px;
    padding: 1.25rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
    height: 100%;
}

/* Hover lift effect - makes cards feel interactive */
.kpi-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 20px -5px rgba(0, 0, 0, 0.15);
}

.kpi-icon {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    opacity: 0.8;
}

.kpi-value {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.2;
}

.kpi-label {
    font-size: 0.75rem;
    color: #6b7280;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 0.25rem;
}

/* KPI color variations - each card type has its own color */
.kpi-tasks .kpi-icon, .kpi-tasks .kpi-value { color: #6366f1; }
.kpi-assigned .kpi-icon, .kpi-assigned .kpi-value { color: #10b981; }
.kpi-violations .kpi-icon, .kpi-violations .kpi-value { color: #ef4444; }
.kpi-score .kpi-icon, .kpi-score .kpi-value { color: #3E00FF; }

/* Pulse animation when KPI value changes (applied via JavaScript) */
.kpi-pulse {
    animation: kpiPulse 0.5s ease;
}

@keyframes kpiPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

/* =============================================================================
 * 5. CONTROL BAR
 *
 * Contains the Solve/Stop buttons and solving spinner.
 *
 * BUTTONS:
 * - #solveButton: Starts the solver (POST to /schedules)
 * - #stopSolvingButton: Stops the solver (DELETE to /schedules/{id})
 * - #analyzeButton: Shows score breakdown (PUT to /schedules/analyze)
 *
 * The spinner (#solvingSpinner) animates while solving is active.
 * ============================================================================= */
.control-bar {
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    padding: 1rem 1.5rem;
}

/* Solving spinner - hidden by default, shown when solving */
#solvingSpinner {
    display: none;
    width: 24px;
    height: 24px;
    border: 3px solid #10b981;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.75s linear infinite;
}

#solvingSpinner.active {
    display: inline-block;
}

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

/* =============================================================================
 * 6. SECTION CARDS
 *
 * Container panels for grouping content (Resources, Tasks, etc.).
 * Consistent styling with header and body areas.
 * ============================================================================= */
.section-card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    height: 100%;
}

.section-header {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    padding: 1rem 1.25rem;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.section-header h5 {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
    color: #334155;
}

.section-body {
    padding: 1.25rem;
}

/* =============================================================================
 * 7. TASK CARDS
 *
 * Visualization for planning entities (what the solver assigns).
 *
 * STATES:
 * - Default (green border): Task is assigned
 * - .unassigned (orange): Task has no resource assigned
 * - .violation (red): Task has a constraint violation
 *
 * CUSTOMIZATION:
 * Modify createTaskCard() in app.js to change what's displayed.
 * ============================================================================= */
.task-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1rem;
}

.task-card {
    background: #f8fafc;
    border-radius: 10px;
    padding: 1rem;
    border-left: 4px solid #10b981; /* Green = assigned */
    transition: all 0.2s ease;
}

.task-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* Unassigned state - yellow/orange warning */
.task-card.unassigned {
    border-left-color: #f59e0b;
    background: #fffbeb;
}

/* Violation state - red error */
.task-card.violation {
    border-left-color: #ef4444;
    background: #fef2f2;
}

.task-name {
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 0.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.task-detail {
    font-size: 0.8rem;
    color: #64748b;
    margin-bottom: 0.25rem;
}

/* Skill tag badge */
.skill-tag {
    display: inline-block;
    background: #dbeafe;
    color: #1d4ed8;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 500;
}

.assigned-badge {
    color: #10b981;
    font-weight: 500;
}

.unassigned-badge {
    color: #9ca3af;
    font-style: italic;
}

/* =============================================================================
 * 8. RESOURCE CARDS
 *
 * Visualization for problem facts (resources that can be assigned to).
 *
 * FEATURES:
 * - Blue gradient background
 * - Capacity bar showing utilization
 * - Skills list
 *
 * CUSTOMIZATION:
 * Modify renderResources() in app.js to change the display.
 * ============================================================================= */
.resource-card {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border-radius: 10px;
    padding: 1rem;
    margin-bottom: 0.75rem;
    border: 1px solid #bfdbfe;
}

.resource-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.resource-name {
    font-weight: 600;
    color: #1e40af;
}

.resource-stats {
    font-size: 0.75rem;
    color: #3b82f6;
}

/* Capacity utilization bar */
.capacity-bar {
    height: 6px;
    background: #e2e8f0;
    border-radius: 3px;
    overflow: hidden;
    margin-top: 0.5rem;
}

.capacity-fill {
    height: 100%;
    background: #10b981; /* Green = under capacity */
    border-radius: 3px;
    transition: width 0.3s ease, background 0.3s ease;
}

/* Warning/danger states for capacity */
.capacity-fill.warning { background: #f59e0b; } /* 80-100% */
.capacity-fill.danger { background: #ef4444; }  /* >100% overflow */

.skills-list {
    margin-top: 0.5rem;
}

/* =============================================================================
 * 9. CONSTRAINT LEGEND
 *
 * Clickable badges showing active constraints from constraints.py.
 *
 * CONSTRAINT TYPES:
 * - Hard (red, lock icon): Must be satisfied, violations = infeasible
 * - Soft (green, feather icon): Optimize these, more = worse score
 *
 * Each badge has a data-target attribute pointing to the constraint
 * function in constraints.py. Clicking navigates to Build tab.
 *
 * TODO: Update these badges to match your constraints.py definitions.
 * ============================================================================= */
.constraints-legend {
    background: white;
    border-radius: 12px;
    padding: 1.25rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.constraint-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

/* Hard constraint styling - red with lock icon */
.constraint-badge.hard {
    background: #fef2f2;
    color: #dc2626;
    border: 1px solid #fecaca;
}

.constraint-badge.hard:hover {
    background: #fecaca;
    transform: translateY(-2px);
}

/* Soft constraint styling - green with feather icon */
.constraint-badge.soft {
    background: #f0fdf4;
    color: #16a34a;
    border: 1px solid #bbf7d0;
}

.constraint-badge.soft:hover {
    background: #bbf7d0;
    transform: translateY(-2px);
}

/* =============================================================================
 * 10. BUILD TAB STYLES
 *
 * The Build tab is a source code viewer showing actual quickstart files.
 *
 * COMPONENTS:
 * - File navigator: Tree view of project files
 * - Code viewer: Syntax-highlighted code display
 * - Annotations: Jump-to-section links
 *
 * HOW IT WORKS:
 * 1. User clicks a file in the navigator
 * 2. app.js loads the source code (embedded or fetched)
 * 3. Prism.js highlights the syntax
 * 4. Annotations show key sections to jump to
 * ============================================================================= */

/* File navigator sidebar */
.file-nav {
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

.file-nav-header {
    background: #f8fafc;
    padding: 1rem;
    border-bottom: 1px solid #e2e8f0;
    font-weight: 600;
    color: #334155;
}

.file-tree {
    padding: 0.5rem;
}

.folder-item {
    padding: 0.5rem;
}

.folder-name {
    color: #64748b;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 0.25rem;
}

/* File item in the tree */
.file-item {
    padding: 0.5rem 0.75rem;
    margin-left: 1rem;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: #475569;
    transition: all 0.2s ease;
}

.file-item:hover {
    background: #f1f5f9;
}

.file-item.active {
    background: #dbeafe;
    color: #1d4ed8;
}

.file-item i {
    width: 16px;
}

/* File type badge */
.file-badge {
    margin-left: auto;
    font-size: 0.65rem;
    background: #f1f5f9;
    padding: 2px 6px;
    border-radius: 4px;
    color: #64748b;
}

/* Main code viewer panel */
.code-viewer {
    background: #0f172a;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.code-viewer-header {
    background: #1e293b;
    padding: 0.75rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #334155;
}

.code-path {
    color: #94a3b8;
    font-family: monospace;
    font-size: 0.85rem;
}

.code-viewer-body {
    max-height: 600px;
    overflow-y: auto;
}

.code-viewer-body pre {
    margin: 0 !important;
    padding: 1rem !important;
    background: transparent !important;
}

/* Code annotations sidebar */
.code-annotations {
    background: white;
    border-radius: 12px;
    padding: 1rem;
    margin-top: 1rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.annotation-item {
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    transition: background 0.2s;
}

.annotation-item:hover {
    background: #f1f5f9;
}

.annotation-line {
    color: #94a3b8;
    font-size: 0.75rem;
}

/* =============================================================================
 * 11. NAVIGATION OVERRIDES
 *
 * Custom styling for the main tab navigation.
 * Uses pill-style buttons with rounded corners.
 * ============================================================================= */
.nav-main {
    display: flex;
    gap: 0.5rem;
}

.nav-main .nav-link {
    border-radius: 8px;
    padding: 0.5rem 1rem;
    color: #475569;
    font-weight: 500;
    transition: all 0.2s ease;
}

.nav-main .nav-link:hover {
    background: #f1f5f9;
    color: #1e293b;
}

/* Active tab styling - green background */
.nav-main .nav-link.active {
    background: #10b981;
    color: white;
}

.nav-main .nav-link i {
    margin-right: 6px;
}

/* =============================================================================
 * 12. NOTIFICATION PANEL
 *
 * Fixed position panel for showing notifications (errors, success messages).
 * Positioned in top-right corner.
 * ============================================================================= */
#notificationPanel {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 1050;
}

/* =============================================================================
 * 13. RESPONSIVE ADJUSTMENTS
 *
 * Mobile-friendly modifications for smaller screens.
 * ============================================================================= */
@media (max-width: 768px) {
    /* Single column task grid on mobile */
    .task-grid {
        grid-template-columns: 1fr;
    }

    /* Smaller KPI values */
    .kpi-value {
        font-size: 1.5rem;
    }

    /* Hide progress step labels on mobile */
    .step-label {
        display: none;
    }
}