:root {
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --border-color: #e2e8f0;
    
    /* Group Colors */
    --group-input: #3b82f6;
    --group-input-bg: #eff6ff;
    
    --group-output: #10b981;
    --group-output-bg: #ecfdf5;
    
    --group-outcome: #f59e0b;
    --group-outcome-bg: #fffbeb;
    
    --group-impact: #8b5cf6;
    --group-impact-bg: #f5f3ff;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05), 0 1px 2px rgba(0,0,0,0.03);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.05), 0 4px 6px -2px rgba(0,0,0,0.025);
    
    --radius-md: 12px;
    --radius-lg: 16px;
    
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.app-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 3rem;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 8px;
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--accent-color), var(--group-impact));
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

.header h1 {
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* Navigation */
.tabs {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 2.5rem;
}

.tab-btn {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 10px 20px;
    border-radius: 30px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.tab-btn:hover {
    color: var(--text-primary);
    border-color: #cbd5e1;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.tab-btn.active {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 1.5rem;
}

/* Card */
.indicator-card {
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.indicator-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    transition: var(--transition);
}

.indicator-card[data-group="INPUT"]::before { background-color: var(--group-input); }
.indicator-card[data-group="OUTPUT"]::before { background-color: var(--group-output); }
.indicator-card[data-group="OUTCOME"]::before { background-color: var(--group-outcome); }
.indicator-card[data-group="IMPACT"]::before { background-color: var(--group-impact); }

.indicator-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.card-badge {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.indicator-card[data-group="INPUT"] .card-badge { background-color: var(--group-input-bg); color: var(--group-input); }
.indicator-card[data-group="OUTPUT"] .card-badge { background-color: var(--group-output-bg); color: var(--group-output); }
.indicator-card[data-group="OUTCOME"] .card-badge { background-color: var(--group-outcome-bg); color: var(--group-outcome); }
.indicator-card[data-group="IMPACT"] .card-badge { background-color: var(--group-impact-bg); color: var(--group-impact); }

.card-code {
    font-weight: 700;
    color: var(--text-secondary);
    font-size: 0.85rem;
    background: #f1f5f9;
    padding: 4px 8px;
    border-radius: 6px;
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.4;
    flex-grow: 1;
}

.card-section {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px dashed var(--border-color);
}

.section-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 4px;
    letter-spacing: 0.05em;
}

.section-value {
    font-size: 0.9rem;
    color: var(--text-primary);
}

.standard-value {
    display: inline-block;
    padding: 2px 8px;
    background: #f1f5f9;
    border-radius: 4px;
    font-weight: 500;
    color: var(--text-primary);
    margin-top: 4px;
}

/* Formula section with special background */
.formula-section {
    background-color: #f8fafc;
    padding: 12px;
    border-radius: var(--radius-md);
    margin-top: 1rem;
    border: 1px solid var(--border-color);
}

.formula-section .section-label {
    margin-bottom: 8px;
}

.formula-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
}
.formula-item {
    font-size: 0.85rem;
    color: var(--text-secondary);
}
.formula-item span {
    font-weight: 600;
    color: var(--text-primary);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.indicator-card {
    animation: fadeIn 0.4s ease-out forwards;
}

/* Responsive */
@media (max-width: 768px) {
    .app-container {
        padding: 1rem;
    }
    
    .header h1 {
        font-size: 1.75rem;
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
}