:root {
    /* Spacing System (Base 8px) */
    --space-1: 0.5rem;   /* 8px */
    --space-2: 1rem;     /* 16px */
    --space-3: 1.5rem;   /* 24px */
    --space-4: 2rem;     /* 32px */
    --space-5: 2.5rem;   /* 40px */
    --space-6: 3rem;     /* 48px */
    
    /* Typography Scale */
    --text-xs: 0.75rem;  /* 12px */
    --text-sm: 0.875rem; /* 14px */
    --text-base: 1rem;   /* 16px */
    --text-lg: 1.125rem; /* 18px */
    --text-xl: 1.25rem;  /* 20px */
    --text-2xl: 1.5rem;  /* 24px */
    --text-3xl: 2rem;    /* 32px */
    --text-4xl: 2.5rem;  /* 40px */
    
    /* Nimbzo Brand Tokens */
    --bg-main: #0f1115;
    --bg-card: rgba(255, 255, 255, 0.05); /* glass-bg */
    --bg-input: rgba(0, 0, 0, 0.2);
    --text-main: #ffffff;
    --text-muted: #d1d5db;
    --text-dim: #9ca3af;
    --accent-primary: #CC2B52;
    --accent-primary-hover: #DE7C7D; /* primary-light */
    --border-color: rgba(255, 255, 255, 0.1); /* glass-border */
    
    /* Flow visualizer */
    --accent-success: #4ade80; /* Keep specific data-viz colors distinct from brand if needed, or adjust */
    --accent-danger: #CC2B52; /* Match brand red for danger/leakage */
}

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    margin: 0;
    padding: var(--space-4);
    padding-bottom: 120px;
    line-height: 1.6;
}

h1, h2, h3 {
    margin-top: 0;
    color: var(--text-main);
    font-weight: 700;
}

h1 {
    font-size: var(--text-4xl);
    margin-bottom: var(--space-2);
}

h2 {
    font-size: var(--text-xl);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: var(--space-1);
    margin-bottom: var(--space-3);
}

h3 {
    font-size: var(--text-lg);
    margin-bottom: var(--space-2);
    color: var(--accent-primary-hover);
}

/* Header & Navigation */
.back-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: var(--text-sm);
    display: inline-block;
    margin-bottom: var(--space-3);
    transition: color 0.3s ease;
}
.back-link:hover, .back-link:focus-visible {
    color: var(--accent-primary-hover);
    outline: none;
}

header {
    margin-bottom: var(--space-4);
}

.scoreboard {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    padding: var(--space-3) var(--space-4);
    border-radius: 20px;
    margin: var(--space-2) 0;
    display: inline-block;
}
.scoreboard h2 {
    font-size: var(--text-xl);
    border-bottom: none;
    margin: 0 0 var(--space-1) 0;
    padding: 0;
    color: var(--text-dim);
    font-weight: 600;
}
.scoreboard h3 {
    font-size: var(--text-4xl);
    margin: 0;
    font-weight: 800;
    background: linear-gradient(135deg, #ffffff 30%, #DE7C7D 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

#advance-btn, #floating-advance-btn, #advance-5-btn, #floating-advance-5-btn {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-base);
    cursor: pointer;
    background: linear-gradient(135deg, var(--accent-primary), #740938);
    color: white;
    border: none;
    border-radius: 12px;
    font-weight: 600;
    display: block;
    margin-top: var(--space-3);
    box-shadow: 0 4px 15px rgba(204, 43, 82, 0.3);
    transition: transform 0.2s, box-shadow 0.2s;
}
#advance-btn:hover, #advance-btn:focus-visible,
#floating-advance-btn:hover, #floating-advance-btn:focus-visible,
#advance-5-btn:hover, #advance-5-btn:focus-visible,
#floating-advance-5-btn:hover, #floating-advance-5-btn:focus-visible {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(204, 43, 82, 0.5);
    outline: none;
}
#advance-btn:active, #floating-advance-btn:active, #advance-5-btn:active, #floating-advance-5-btn:active {
    transform: translateY(1px);
}

/* Welcome Card */
.welcome-toast {
    position: fixed;
    bottom: 100px; /* Above the advance bar */
    left: 50%;
    transform: translateX(-50%) translateY(0);
    width: 90%;
    max-width: 450px;
    background: var(--bg-card);
    backdrop-filter: blur(25px);
    border: 1px solid var(--border-color);
    padding: var(--space-3) var(--space-4);
    border-radius: 16px;
    z-index: 1000;
    box-shadow: 0 15px 40px rgba(0,0,0,0.6);
    display: flex;
    flex-direction: column;
    transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    opacity: 1;
}
.welcome-toast.hidden {
    opacity: 0;
    transform: translateX(-50%) translateY(20px);
    pointer-events: none;
}
.welcome-content h3 {
    margin-top: 0;
    font-size: var(--text-lg);
    color: var(--accent-primary-hover);
    margin-bottom: var(--space-1);
}
.welcome-content p {
    font-size: var(--text-sm);
    color: var(--text-dim);
    line-height: 1.4;
    margin: 0;
}
.welcome-close {
    position: absolute;
    top: 12px;
    right: 15px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.2rem;
    cursor: pointer;
    line-height: 1;
    transition: color 0.2s;
    padding: 0;
}
.welcome-close:hover {
    color: var(--text-main);
}

/* Floating Elements */
.floating-flow {
    position: fixed;
    bottom: 100px;
    right: 20px;
    background: var(--bg-card);
    backdrop-filter: blur(15px);
    border: 1px solid var(--border-color);
    padding: var(--space-3);
    border-radius: 16px;
    width: 300px;
    z-index: 100;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    transition: opacity 0.3s ease, transform 0.3s ease;
    opacity: 1;
    transform: translateY(0);
    pointer-events: none; /* Just for display */
}
.floating-flow.hidden {
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
}
.floating-flow .flow-bar-container {
    height: 16px;
}
.floating-flow .flow-label {
    width: 100px;
    font-size: 11px;
}
.floating-flow .flow-row {
    gap: var(--space-1);
    margin-bottom: 4px;
}

.floating-advance {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    padding: 1rem;
    transition: opacity 0.3s ease, transform 0.3s ease;
    opacity: 1;
    pointer-events: auto;
}
.floating-advance.hidden {
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
}

.floating-advance #floating-advance-btn, .floating-advance #floating-advance-5-btn {
    margin-top: 0;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    box-shadow: 0 10px 30px rgba(204, 43, 82, 0.5);
}

/* Sections Base */
.controls-section,
.flow-section,
.chart-section {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    padding: var(--space-4) var(--space-4);
    border-radius: 20px;
    margin-bottom: var(--space-4);
}

/* Policy Controls */
.policy-category {
    margin-bottom: var(--space-3);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    background: rgba(0, 0, 0, 0.2);
}
.policy-category summary {
    padding: var(--space-2) var(--space-3);
    background-color: rgba(255, 255, 255, 0.03);
    font-size: var(--text-lg);
    font-weight: 600;
    cursor: pointer;
    color: var(--text-main);
    transition: background-color 0.2s;
    user-select: none;
}
.policy-category summary:hover, .policy-category summary:focus-visible {
    background-color: rgba(255, 255, 255, 0.08);
    outline: none;
}
.controls-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-3);
    padding: var(--space-3);
}
.control-group label {
    display: block;
    margin-bottom: var(--space-3);
    font-size: var(--text-base);
    color: var(--text-muted);
}
.control-group span:not(.tag) {
    font-weight: 700;
    color: var(--text-main);
}
.tag {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: var(--text-xs);
    font-weight: 600;
    margin-left: var(--space-1);
    vertical-align: middle;
}
.tag-funding {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
    border: 1px solid var(--border-color);
}
.tag-policy {
    background: rgba(204, 43, 82, 0.15);
    color: var(--accent-primary-hover);
    border: 1px solid rgba(204, 43, 82, 0.3);
}
.tag-integrity {
    background: rgba(56, 189, 248, 0.15);
    color: #38bdf8;
    border: 1px solid rgba(56, 189, 248, 0.3);
}
/* Tooltips */
.info-icon {
    display: inline-flex;
    width: 18px; 
    height: 18px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    align-items: center; 
    justify-content: center;
    font-size: 11px; 
    cursor: help; 
    position: relative;
    margin-left: 8px; 
    font-weight: bold;
    color: var(--text-muted);
    border: 1px solid var(--border-color);
    transition: background 0.2s, color 0.2s;
}
.info-icon:hover, .info-icon:focus {
    background: var(--accent-primary);
    color: #fff;
    outline: none;
}
.info-icon:hover::after, .info-icon:focus::after {
    content: attr(data-tooltip);
    position: absolute; 
    bottom: 130%; 
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    padding: 8px 12px; 
    border-radius: 8px;
    width: 220px;
    text-align: center; 
    font-size: 12px;
    line-height: 1.4;
    font-weight: normal;
    color: var(--text-main);
    z-index: 10;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
    pointer-events: none;
}

/* Custom Sliders */
.control-group input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    margin-top: var(--space-2);
    margin-bottom: var(--space-2);
    background: var(--bg-input);
    border-radius: 4px;
    outline: none;
    background-image: linear-gradient(90deg, var(--accent-primary), var(--accent-primary-hover));
    background-size: var(--val, 0%) 100%;
    background-repeat: no-repeat;
    cursor: pointer;
}
.control-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #ffffff;
    cursor: pointer;
    box-shadow: 0 0 10px rgba(204, 43, 82, 0.6);
    transition: transform 0.1s;
}
.control-group input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}
.control-group input[type="range"]:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 4px;
}

/* Hero Section */
.hero-intro {
    margin-bottom: var(--space-4);
}
.hero-intro h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #ffffff 30%, var(--accent-primary-hover) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.hero-subtitle {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto 2rem auto;
}
.steps-flex {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}
.step {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1.2rem;
    border-radius: 50px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.step-num {
    background: var(--accent-primary);
    color: #fff;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: bold;
}
.step strong {
    font-size: 0.95rem;
    color: var(--text-main);
}
.step-arrow {
    color: var(--text-dim);
    font-size: 1.2rem;
}
.text-center {
    text-align: center;
}

/* Flow Visualizer */
.flow-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}
.flow-row {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}
.flow-label {
    width: 140px;
    flex-shrink: 0;
    font-size: var(--text-sm);
    color: var(--text-muted);
    font-weight: 500;
}
.flow-bar-container {
    flex-grow: 1;
    background-color: var(--bg-input);
    height: 24px;
    border-radius: 6px;
    overflow: hidden;
    position: relative;
    border: 1px solid var(--border-color);
}
.flow-bar-gross {
    height: 100%;
    display: flex;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.flow-segment-effective,
.flow-segment-leakage {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #000;
    font-size: var(--text-xs);
    font-weight: 700;
    overflow: hidden;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.flow-segment-effective {
    background-color: var(--accent-success);
}
.flow-segment-leakage {
    background-color: var(--accent-danger);
    color: #fff;
}

@keyframes pulseGlow {
    0% { box-shadow: 0 0 0 0 rgba(204, 43, 82, 0.4); background-color: rgba(204, 43, 82, 0.1); }
    50% { box-shadow: 0 0 10px 4px rgba(204, 43, 82, 0.6); background-color: rgba(204, 43, 82, 0.2); }
    100% { box-shadow: 0 0 0 0 rgba(204, 43, 82, 0); background-color: transparent; }
}
.glow-pulse {
    animation: pulseGlow 0.6s ease-out;
    border-radius: 8px;
}

/* Dashboard Grid */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-4);
    margin-bottom: var(--space-4);
}
.module-group {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    padding: var(--space-4);
    border-radius: 20px;
    height: 100%;
}
.module-group h3 {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: var(--space-1);
    color: var(--accent-primary-hover);
}
.card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-2);
    font-size: var(--text-sm);
    color: var(--text-dim);
}
.card:last-child {
    margin-bottom: 0;
}
.card span {
    font-weight: 700;
    color: var(--text-main);
    font-size: var(--text-base);
    transition: color 0.5s ease;
}
.card span.updated {
    color: var(--accent-primary-hover);
    transition: none;
}

/* Chart */
.chart-container {
    position: relative;
    height: 400px;
    width: 100%;
}

/* Responsive Breakpoints */
@media (max-width: 768px) {
    body {
        padding: var(--space-2);
    }
    .controls-section,
    .flow-section,
    .chart-section,
    .scoreboard {
        padding: var(--space-3);
    }
    .flow-row {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-1);
    }
    .flow-label {
        width: 100%;
    }
    .flow-bar-container {
        width: 100%;
    }

    /* Fix horizontal overflow caused by width + padding */
    .welcome-toast, .floating-advance {
        box-sizing: border-box;
    }

    /* Shrink the toast padding slightly for small screens */
    .welcome-toast {
        padding: var(--space-2) var(--space-3);
    }

    /* Reduce advance button padding, gap, and font-size so both fit side-by-side cleanly at 375px */
    .floating-advance {
        gap: 0.5rem;
        padding: 0.75rem 1rem;
    }
    .floating-advance #floating-advance-btn, 
    .floating-advance #floating-advance-5-btn {
        padding: 0.9rem 1rem;
        font-size: 0.95rem;
    }
}