/* Safe Choices - Modern Dark Theme */

:root {
    /* Color Palette */
    --bg-base: #0a0f1a;
    --bg-surface: #111827;
    --bg-elevated: #1f2937;
    --bg-hover: #374151;

    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;

    --accent: #3b82f6;
    --accent-light: #60a5fa;
    --accent-dark: #2563eb;
    --accent-glow: rgba(59, 130, 246, 0.15);

    --success: #10b981;
    --success-bg: rgba(16, 185, 129, 0.1);
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.1);
    --warning: #f59e0b;

    --border: rgba(255, 255, 255, 0.08);
    --border-accent: rgba(59, 130, 246, 0.3);

    /* Sizing */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;

    /* Typography */
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

html {
    font-size: 14px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* ===== HEADER ===== */
.header {
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
}

.header-content {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

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

.brand-text h1 {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.brand-tagline {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 400;
}

.data-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    background: var(--bg-elevated);
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
}

.badge-dot {
    width: 6px;
    height: 6px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ===== MAIN LAYOUT ===== */
.main {
    max-width: 1440px;
    margin: 0 auto;
    padding: 24px;
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 24px;
    min-height: calc(100vh - 64px);
}

/* ===== SIDEBAR ===== */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 24px;
    position: sticky;
    top: 88px;
    height: fit-content;
}

.sidebar-section {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.section-label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    padding-left: 4px;
}

/* Toggle Buttons */
.toggle-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.toggle-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

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

.toggle-btn.active {
    background: var(--accent-glow);
    border-color: var(--border-accent);
    color: var(--accent-light);
}

.toggle-btn svg {
    flex-shrink: 0;
    opacity: 0.7;
}

.toggle-btn.active svg {
    opacity: 1;
}

/* Strategy Cards */
.strategy-cards {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.strategy-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
}

.strategy-card:hover {
    background: var(--bg-elevated);
    border-color: rgba(255, 255, 255, 0.12);
    transform: translateX(2px);
}

.strategy-card.active {
    background: var(--accent-glow);
    border-color: var(--border-accent);
}

.strategy-icon {
    width: 36px;
    height: 36px;
    background: var(--bg-elevated);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    flex-shrink: 0;
}

.strategy-card.active .strategy-icon {
    background: var(--accent);
    color: white;
}

.strategy-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.strategy-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

.strategy-desc {
    font-size: 11px;
    color: var(--text-muted);
}

/* Quick Stats */
.quick-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.quick-stat {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 12px;
    text-align: center;
}

.quick-stat-value {
    display: block;
    font-size: 18px;
    font-weight: 700;
    color: var(--accent-light);
}

.quick-stat-label {
    font-size: 10px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ===== CONTENT ===== */
.content {
    min-width: 0;
}

.simulation-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.methodology-content {
    display: none;
}

/* ===== PANELS ===== */
.panel {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.panel-header {
    margin-bottom: 20px;
}

.panel-header h2 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.panel-header h2 svg {
    color: var(--accent);
}

/* ===== PARAMETERS ===== */
.params-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 12px;
    margin-bottom: 24px;
}

.param-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.param-label {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 11px;
    font-weight: 500;
    color: var(--text-secondary);
}

.param-hint {
    position: relative;
    width: 14px;
    height: 14px;
    background: var(--bg-elevated);
    border-radius: 50%;
    font-size: 9px;
    font-weight: 600;
    color: var(--text-muted);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: help;
    transition: all 0.2s;
}

.param-hint:hover {
    background: var(--accent);
    color: white;
}

.param-hint::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    padding: 8px 12px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 400;
    color: var(--text-primary);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s;
    z-index: 100;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.param-hint:hover::after {
    opacity: 1;
    visibility: visible;
}

.param-input-wrap {
    position: relative;
    display: flex;
    align-items: center;
}

.param-input {
    width: 100%;
    padding: 8px 10px;
    background: var(--bg-base);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 13px;
    font-weight: 500;
    font-family: var(--font);
    transition: all 0.2s;
}

.param-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.param-input-wrap .param-input {
    padding-right: 36px;
}

.param-unit {
    position: absolute;
    right: 8px;
    font-size: 11px;
    color: var(--text-muted);
    pointer-events: none;
}

.param-select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 24 24' fill='none' stroke='%239ca3af' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
    padding-right: 28px;
}

.custom-target-input {
    display: none;
    margin-top: 8px;
}

.custom-target-input.visible {
    display: block;
}

/* Conditional visibility */
.threshold-only,
.multi-only,
.kelly-only {
    display: none;
}

.threshold-only.visible,
.multi-only.visible,
.kelly-only.visible {
    display: flex;
}

/* ===== RUN BUTTON ===== */
.run-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

.run-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 28px;
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: 14px;
    font-weight: 600;
    font-family: var(--font);
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.3);
}

.run-btn:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.run-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.run-btn.running .run-icon {
    display: none;
}

.run-btn.running .run-spinner {
    display: block;
}

.run-spinner {
    display: none;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.run-estimate {
    font-size: 12px;
    color: var(--text-muted);
}

/* ===== PROGRESS ===== */
.progress-panel {
    display: none;
    padding: 20px 24px;
}

.progress-panel.visible {
    display: block;
}

.progress-content {
    max-width: 500px;
    margin: 0 auto;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    font-size: 13px;
}

#progressText {
    color: var(--text-primary);
    font-weight: 500;
}

#progressPercent {
    color: var(--accent-light);
    font-weight: 600;
}

.progress-track {
    height: 6px;
    background: var(--bg-elevated);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    border-radius: 3px;
    transition: width 0.3s ease;
}

/* ===== RESULTS ===== */
.results {
    display: none;
    flex-direction: column;
    gap: 20px;
}

.results.visible {
    display: flex;
}

/* Key Metrics */
.metrics-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.metric-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px;
    text-align: center;
    transition: all 0.2s;
}

.metric-card:hover {
    border-color: rgba(255, 255, 255, 0.12);
}

.metric-card.metric-primary {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(59, 130, 246, 0.05));
    border-color: var(--border-accent);
}

.metric-card.metric-survivors {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(16, 185, 129, 0.05));
    border-color: rgba(16, 185, 129, 0.3);
}

.metric-card.metric-risk .metric-value.high-risk {
    color: var(--danger);
}

.metric-label {
    font-size: 11px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.metric-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.metric-value.positive {
    color: var(--success);
}

.metric-value.negative {
    color: var(--danger);
}

/* Stats Panels */
.stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
}

.stat-panel {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px;
}

.stat-panel h3 {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.stat-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.stat-item .stat-label {
    font-size: 13px;
    color: var(--text-secondary);
}

.stat-item .stat-value {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.multi-stats,
.threshold-stats,
.kelly-stats {
    display: none;
}

.multi-stats.visible,
.threshold-stats.visible,
.kelly-stats.visible {
    display: block;
}

/* Charts */
.charts-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.chart-panel {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px;
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.chart-header h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.export-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 500;
    font-family: var(--font);
    cursor: pointer;
    transition: all 0.2s;
}

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

.chart-container {
    height: 280px;
    position: relative;
}

.multi-chart {
    display: none;
    grid-column: span 2;
}

.multi-chart.visible {
    display: block;
}

/* ===== METHODOLOGY ===== */
.article {
    max-width: 800px;
    margin: 0 auto;
}

.article-header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border);
}

.article-header h1 {
    font-size: 36px;
    font-weight: 700;
    color: var(--accent-light);
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.article-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
}

.article-section {
    margin-bottom: 36px;
}

.article-section h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
}

.article-section p {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.7;
}

.article-list {
    margin-left: 20px;
    margin-bottom: 16px;
}

.article-list li {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    line-height: 1.6;
}

.article-section a {
    color: var(--accent-light);
    text-decoration: none;
}

.article-section a:hover {
    text-decoration: underline;
}

/* Callouts */
.callout {
    padding: 20px 24px;
    border-radius: var(--radius-lg);
    margin-bottom: 20px;
}

.callout-intro {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(59, 130, 246, 0.05));
    border-left: 3px solid var(--accent);
}

.callout-intro p {
    color: var(--text-primary);
}

.callout-intro p:last-child {
    margin-bottom: 0;
}

.callout-hypothesis {
    background: var(--bg-elevated);
    border: 1px solid var(--accent);
}

.callout-hypothesis strong {
    color: var(--accent-light);
}

/* Tags */
.tag-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 16px 0;
}

.tag {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

.tag-excluded {
    background: var(--danger-bg);
    color: var(--danger);
}

/* Model Steps */
.model-steps {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.model-step {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    background: var(--bg-elevated);
    border-radius: var(--radius-md);
}

.step-num {
    width: 28px;
    height: 28px;
    background: var(--accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 700;
    color: white;
    flex-shrink: 0;
}

.step-text {
    font-size: 14px;
    color: var(--text-primary);
}

.step-text strong {
    color: var(--accent-light);
}

/* Strategy Explainer */
.strategy-explainer {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
}

.strategy-box {
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    padding: 20px;
}

.strategy-box h3 {
    font-size: 15px;
    font-weight: 600;
    color: var(--accent-light);
    margin-bottom: 8px;
}

.strategy-box p {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 0;
    line-height: 1.6;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .main {
        grid-template-columns: 1fr;
        padding: 16px;
    }

    .sidebar {
        position: static;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 16px;
    }

    .sidebar-section {
        flex: 1;
        min-width: 200px;
    }

    .toggle-group {
        flex-direction: row;
    }

    .strategy-cards {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .strategy-card {
        flex: 1;
        min-width: 180px;
    }

    .metrics-row {
        grid-template-columns: repeat(2, 1fr);
    }

    .charts-row {
        grid-template-columns: 1fr;
    }

    .multi-chart {
        grid-column: span 1;
    }
}

@media (max-width: 640px) {
    .header-content {
        padding: 0 16px;
    }

    .brand-tagline {
        display: none;
    }

    .params-grid {
        grid-template-columns: 1fr 1fr;
    }

    .metrics-row {
        grid-template-columns: 1fr;
    }

    .metric-value {
        font-size: 24px;
    }

    .stats-row {
        grid-template-columns: 1fr;
    }

    .strategy-explainer {
        grid-template-columns: 1fr;
    }

    .run-container {
        flex-direction: column;
        gap: 12px;
    }

    .run-btn {
        width: 100%;
        justify-content: center;
    }
}

/* Hidden utility */
.simulation-view-only.hidden {
    display: none !important;
}