/* ============================================
   QML Visualization Hub - Shared Styles
   Base theme and components for all tools
   ============================================ */

/* CSS Variables - Design Tokens */
:root {
    /* Colors */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-panel: rgba(20, 20, 30, 0.8);
    --bg-card: rgba(20, 20, 35, 0.9);
    --bg-hover: rgba(255, 255, 255, 0.05);

    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #606070;

    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);

    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #06b6d4;

    --border-color: rgba(255, 255, 255, 0.1);

    /* Spacing */
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

/* ============================================
   Reset & Base
   ============================================ */

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

html,
body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
}

/* ============================================
   App Container Layouts
   ============================================ */

.app-container {
    height: 100vh;
    max-height: 100vh;
    overflow: hidden;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(139, 92, 246, 0.08) 0%, transparent 50%),
        var(--bg-primary);
}

.app-container.three-column {
    display: grid;
    grid-template-columns: 280px 1fr 220px;
    padding: var(--spacing-md);
    gap: var(--spacing-md);
}

.app-container.two-column {
    display: grid;
    grid-template-columns: 1fr 280px;
    padding: var(--spacing-md);
    gap: var(--spacing-md);
}

/* ============================================
   Panels
   ============================================ */

.panel {
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    backdrop-filter: blur(12px);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.panel-header.compact {
    padding: 6px 10px;
}

.panel-header h2 {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.panel-body {
    flex: 1;
    position: relative;
    min-height: 0;
    overflow: auto;
}

.panel-body canvas {
    width: 100% !important;
    height: 100% !important;
}

/* ============================================
   Left/Right Panels
   ============================================ */

.left-panel,
.right-panel {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    min-height: 0;
    overflow: hidden;
}

.left-panel .panel,
.right-panel .panel {
    flex: 1;
    min-height: 0;
}

.middle-panel {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    min-height: 0;
    overflow: hidden;
}

/* Parameters Panel */
.params-header {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

.param-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.param-group label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 16px;
    font-size: 0.875rem;
    font-weight: 500;
    font-family: var(--font-family);
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn-xs {
    padding: 4px 8px;
    font-size: 0.7rem;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.8rem;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

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

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

.btn-ghost:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.2);
    border: 1px solid var(--danger);
    color: var(--danger);
}

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

.btn-success {
    background: rgba(16, 185, 129, 0.2);
    border: 1px solid var(--success);
    color: var(--success);
}

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

/* ============================================
   Form Controls
   ============================================ */

.select,
.input {
    padding: 8px 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-size: 0.875rem;
    font-family: var(--font-family);
    transition: border-color var(--transition-fast);
    width: 100%;
}

.select:focus,
.input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.select option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.slider {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    background: var(--bg-secondary);
    border-radius: 3px;
    outline: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--accent-primary);
    border-radius: 50%;
    cursor: pointer;
}

/* ============================================
   Badges
   ============================================ */

.badge {
    padding: 4px 10px;
    background: rgba(99, 102, 241, 0.2);
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--accent-primary);
}

.badge-success {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.2);
    color: var(--warning);
}

.badge-danger {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger);
}

/* ============================================
   Training Bar
   ============================================ */

.training-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
}

.epoch-badge {
    background: var(--bg-secondary);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
}

.epoch-badge span {
    color: var(--accent-primary);
    font-size: 1rem;
}

/* ============================================
   Metrics Row
   ============================================ */

.metrics-row {
    display: flex;
    gap: var(--spacing-md);
    flex: 1;
    min-height: 0;
}

.metric-panel {
    flex: 1;
}

/* ============================================
   Tooltip
   ============================================ */

.tooltip {
    position: fixed;
    padding: 8px 12px;
    background: rgba(0, 0, 0, 0.9);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 0.75rem;
    color: var(--text-primary);
    pointer-events: none;
    z-index: 1000;
    max-width: 300px;
    display: none;
}

.tooltip.visible {
    display: block;
}

/* ============================================
   Modal
   ============================================ */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.modal-body {
    padding: var(--spacing-md);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

/* ============================================
   Fullscreen
   ============================================ */

.panel.fullscreen {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    width: 100vw !important;
    height: 100vh !important;
    z-index: 9999 !important;
    border-radius: 0 !important;
    background: var(--bg-primary) !important;
}

/* ============================================
   Landing Page Styles
   ============================================ */

.landing-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    overflow-y: auto;
}

.landing-title {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.landing-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

/* Problem/Category Cards Grid */
.problem-cards,
.category-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1200px;
    width: 100%;
}

.problem-card,
.category-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.problem-card::before,
.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-gradient);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.problem-card:hover,
.category-card:hover {
    transform: translateY(-4px);
    border-color: rgba(99, 102, 241, 0.4);
    box-shadow: var(--shadow-glow);
}

.problem-card:hover::before,
.category-card:hover::before {
    opacity: 1;
}

.problem-icon,
.card-icon {
    font-size: 40px;
    margin-bottom: var(--spacing-md);
}

.problem-card h2,
.category-card h2 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
}

.problem-card p,
.category-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.problem-features {
    list-style: none;
    margin-bottom: var(--spacing-md);
}

.problem-features li {
    font-size: 0.8rem;
    color: var(--text-muted);
    padding: 4px 0;
    padding-left: 16px;
    position: relative;
}

.problem-features li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
}

/* ============================================
   Mode Header (for tool sub-modes)
   ============================================ */

.mode-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-panel);
    border-bottom: 1px solid var(--border-color);
}

.mode-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* ============================================
   Utility Classes
   ============================================ */

.hidden {
    display: none !important;
}

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

.text-center {
    text-align: center;
}

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.gap-sm {
    gap: var(--spacing-sm);
}

.gap-md {
    gap: var(--spacing-md);
}

/* ============================================
   Scrollbar
   ============================================ */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

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

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ============================================
   Animations
   ============================================ */

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

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

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

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

.fade-in {
    animation: fadeIn 0.3s ease;
}

/* ============================================
   Shared Top Toolbar (for all tools)
   ============================================ */

.tool-toolbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 50px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    z-index: 1000;
}

.tool-toolbar .toolbar-left,
.tool-toolbar .toolbar-center,
.tool-toolbar .toolbar-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

.tool-toolbar .toolbar-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.tool-toolbar .toolbar-btn {
    padding: 6px 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.8rem;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s ease;
}

.tool-toolbar .toolbar-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-primary);
}

.tool-toolbar .toolbar-btn.btn-primary {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

.tool-toolbar .toolbar-btn.btn-primary:hover {
    background: #5558e0;
}

.tool-toolbar .toolbar-btn.btn-danger {
    color: var(--danger);
    border-color: var(--danger);
}

.tool-toolbar .toolbar-btn.btn-danger:hover {
    background: var(--danger);
    color: white;
}

.tool-toolbar .toolbar-btn.btn-close {
    font-size: 1rem;
    padding: 6px 10px;
}

.tool-toolbar .toolbar-btn.btn-close:hover {
    background: var(--danger);
    border-color: var(--danger);
    color: white;
}

/* Content area below toolbar */
.tool-content {
    position: fixed;
    top: 50px;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: auto;
    background: var(--bg-primary);
}

/* Grid layouts for tools with multiple panels */
.tool-grid {
    display: grid;
    gap: 10px;
    padding: 10px;
    height: 100%;
}

.tool-grid.grid-2 {
    grid-template-columns: 1fr 1fr;
}

.tool-grid.grid-3 {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
}

.tool-grid.grid-3> :first-child {
    grid-column: span 2;
}

.tool-grid.grid-4 {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
}