:root {
    /* Grayscale Theme */
    --bg-body: #0E0E10;
    --bg-panel: #18181B;
    --bg-input: #27272A;
    --border-color: #3F3F46;
    --border-hover: #52525B;
    --text-main: #FFFFFF;
    --text-muted: #A1A1AA;
    
    /* Custom Palette */
    --brand-dark: #355872;
    --brand-mid: #7AAACE;
    --brand-light: #9CD5FF;
    --brand-white: #F7F8F0;

    --text-main: var(--brand-white);
    --primary-blue: var(--brand-mid); 
    
    /* Green-to-Red Heatmap */
    --tier-1: #10B981; /* Optimal: Green */
    --tier-2: #84CC16; /* Economical: Lime */
    --tier-3: #EAB308; /* Marginal: Yellow */
    --tier-4: #F97316; /* Expensive: Orange */
    --tier-5: #EF4444; /* Uneconomical: Red */
    --tier-6: #991B1B; /* Unspendable: Dark Red */
}

html { scroll-behavior: smooth; }

* { box-sizing: border-box; }

body { 
    font-family: 'Ubuntu', sans-serif; 
    padding: 20px; 
    margin: 0; 
    display: flex; 
    gap: 30px; 
    background-color: var(--bg-body); 
    color: var(--text-main);
    min-height: 100vh;
    overflow-x: hidden; 
}

h1, h2, h3 { 
    font-family: 'Ubuntu', sans-serif; 
    font-weight: 700;
    color: var(--primary-blue); 
    margin-top: 0;
    margin-bottom: 10px;
}

/* Brand Box */
.brand-box {
    padding-bottom: 20px;
    margin-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}
.brand-box-titles {
    text-align: center;
    width: 100%;
}
.brand-box-titles h1 { margin: 0; font-size: 32px; color: var(--primary-blue); letter-spacing: 0.5px; }
.brand-box-titles p { margin: 0; color: var(--text-muted); font-size: 14px; font-weight: 500; text-transform: uppercase; letter-spacing: 2px; margin-top: 4px;}

/* 3 Equal-Width Control Sections */
.brand-box-controls {
    display: flex;
    flex-direction: row;
    width: 100%;
    gap: 10px;
}

.control-item {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 36px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-muted);
    font-size: 11px;
    font-weight: 700;
    font-family: 'Ubuntu', sans-serif;
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.2s;
    cursor: pointer;
    padding: 0;
    outline: none;
    box-sizing: border-box;
}

.control-item:hover {
    color: var(--brand-white);
    border-color: var(--primary-blue);
}

/* Specific styling for the Unit Toggle wrapper to fit inside the standard box */
.unit-toggle-wrapper {
    padding: 3px;
    gap: 4px;
    cursor: default;
}
.unit-toggle-wrapper:hover {
    border-color: var(--border-color); /* Prevents the whole box outline glowing blue */
}

.unit-btn {
    flex: 1;
    height: 100%;
    background: transparent;
    color: var(--text-muted);
    border: none;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 700;
    cursor: pointer;
    transition: 0.2s;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.unit-btn.active {
    background: var(--primary-blue);
    color: var(--bg-body);
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}
.unit-btn:hover:not(.active) {
    color: var(--brand-white);
}

/* Resizable Sidebar (Desktop) */
.sidebar { 
    width: 420px; 
    min-width: 380px;
    max-width: 50vw;
    resize: horizontal; 
    background: var(--bg-panel); 
    padding: 20px; 
    border-radius: 8px; 
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 16px rgba(0,0,0,0.4); 
    display: flex;
    flex-direction: column;
    height: calc(100vh - 40px);
    position: sticky;
    top: 20px;
    overflow-y: auto;
    overflow-x: hidden;
}

.sidebar::-webkit-resizer {
    background-color: var(--bg-panel);
    background-image: linear-gradient(135deg, transparent 50%, var(--border-color) 50%);
}

.main-content { flex: 1; display: flex; flex-direction: column; gap: 20px; min-width: 0; }

table { width: 100%; border-collapse: collapse; margin-bottom: 10px; }
th, td { padding: 8px 4px; text-align: left; border-bottom: 1px solid var(--border-color); font-size: 13px; }
th { color: var(--text-muted); text-transform: uppercase; font-weight: 600; font-size: 12px;}

input[type="number"], input[type="text"], textarea, select { 
    width: 100%; 
    padding: 10px 10px; 
    background-color: var(--bg-input);
    color: var(--brand-white);
    border: 1px solid var(--border-color); 
    border-radius: 4px; 
    font-family: 'Ubuntu Mono', monospace;
    font-size: 14px; 
    display: block;
    transition: border-color 0.2s;
    resize: vertical;
    outline: none;
}
input:focus, textarea:focus, select:focus { border-color: var(--primary-blue); }

.full-input { width: 100%; margin-bottom: 10px; }

button { 
    width: 100%; 
    padding: 12px; 
    background-color: var(--primary-blue); 
    color: var(--bg-body); 
    border: none; 
    border-radius: 4px; 
    cursor: pointer; 
    font-family: 'Ubuntu', sans-serif;
    font-weight: 700;
    font-size: 14px;
    transition: 0.2s;
    box-sizing: border-box;
}
button:hover { background-color: var(--brand-light); color: var(--bg-body); }

.btn-secondary { background-color: transparent; border: 1px solid var(--border-color); color: var(--text-main); margin-bottom: 15px; padding: 10px; }
.btn-secondary:hover { background-color: var(--brand-dark); border-color: var(--primary-blue); color: var(--brand-white); }
.btn-remove { width: auto; background-color: transparent; color: var(--tier-5); padding: 6px; font-size: 16px; border: none; }
.btn-remove:hover { background-color: rgba(239, 68, 68, 0.1); color: var(--tier-5); }

.section-divider { margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--border-color); }
input[type="range"] { width: 100%; margin-top: 10px; accent-color: var(--primary-blue); }

.input-label { display: block; font-size: 13px; margin-bottom: 8px; font-weight: 500; color: var(--text-muted);}
.spacer-bottom { margin-bottom: 20px !important; }

.metrics-row { display: flex; gap: 15px; flex-wrap: wrap; }
.metric-card { 
    flex: 1; 
    min-width: 200px;
    background: var(--bg-panel); 
    padding: 15px; 
    border-radius: 8px; 
    border: 1px solid var(--border-color);
    border-top: 4px solid var(--primary-blue);
    box-shadow: 0 8px 16px rgba(0,0,0,0.2); 
}
.metric-card h3 { font-size: 12px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; margin-top:0;}
.metric-card p { margin: 0; font-family: 'Ubuntu Mono', monospace; font-size: 26px; font-weight: 700; color: var(--brand-white); display: flex; align-items: baseline; gap: 8px;}
.metric-unit { font-size: 13px; color: var(--text-muted); font-weight: 400; font-family: 'Ubuntu', sans-serif; }

.visual-container { background: var(--bg-panel); padding: 20px; border-radius: 8px; border: 1px solid var(--border-color); box-shadow: 0 8px 16px rgba(0,0,0,0.2); display: flex; flex-direction: column; min-width: 0; position: relative; overflow: hidden;}

.table-scroll { max-height: 250px; overflow-y: auto; border-bottom: 1px solid var(--border-color); }
.table-scroll::-webkit-scrollbar { width: 8px; }
.table-scroll::-webkit-scrollbar-track { background: var(--bg-body); }
.table-scroll::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 4px; }

.group-header { cursor: pointer; transition: background-color 0.2s; background-color: rgba(255,255,255,0.02); }
.group-header:hover { background-color: rgba(255,255,255,0.05); }
.group-child { display: none; background-color: var(--bg-body); }
.chevron { display: inline-block; transition: transform 0.2s; margin-right: 8px; font-size: 10px; color: var(--text-muted); }
.expanded .chevron { transform: rotate(90deg); }

.utxo-amount-cell { font-family: 'Ubuntu Mono', monospace; font-size: 15px; font-weight: 700; color: white; text-align: left;}
.utxo-id-cell { padding-left: 30px !important; color: var(--text-muted); font-family: 'Ubuntu Mono', monospace; font-size: 12px; word-break: break-all; }
.utxo-id-cell a { color: var(--text-muted); text-decoration: underline; }
.utxo-id-cell a:hover { color: var(--text-main); }

.tables-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(400px, 1fr)); gap: 20px; }

.badge { display: inline-block; padding: 3px 8px; border-radius: 4px; font-size: 11px; font-weight: 600; margin-bottom: 10px; letter-spacing: 0.5px;}
.badge-green { background: rgba(16, 185, 129, 0.15); color: var(--tier-1); border: 1px solid var(--tier-1); }
.badge-grey { background: rgba(255, 255, 255, 0.05); color: var(--text-main); border: 1px solid var(--border-color); }

.tx-section-title { font-size: 12px; color: var(--primary-blue); text-transform: uppercase; font-weight: 600; padding-top: 10px; margin-bottom: 5px; cursor: pointer; user-select: none; transition: color 0.2s; }
.tx-section-title:hover { color: var(--brand-light); }

.usd-fee { color: var(--text-muted); font-size: 13px; margin-left: 6px; font-weight: 400; font-family: 'Ubuntu Mono', monospace;}
.anchor-link { font-size: 20px; font-weight: 600; text-decoration: none; color: var(--primary-blue); transition: 0.2s; padding: 0 5px;}
.anchor-link:hover { color: var(--text-main); }

/* Network Bullet Menu */
.network-selector { background: var(--bg-input); padding: 12px 10px; border-radius: 6px; border: 1px solid var(--border-color); display: flex; flex-wrap: nowrap; justify-content: space-between; margin-bottom: 0px; overflow-x: auto;}
.network-selector label { font-size: 12px; font-weight: 600; color: var(--text-muted); cursor: pointer; display: flex; align-items: center; gap: 4px; transition: color 0.2s; white-space: nowrap;}
.network-selector label:hover { color: var(--brand-white); }
.network-selector input { margin: 0; cursor: pointer; accent-color: var(--primary-blue); width: 14px; height: 14px; }

/* Modal Styles */
.modal-overlay { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.85); z-index: 1000; justify-content: center; align-items: center; }
.modal-content { background: var(--bg-panel); border: 1px solid var(--border-color); border-radius: 8px; width: 550px; max-width: 90%; max-height: 85vh; display: flex; flex-direction: column; box-shadow: 0 16px 40px rgba(0,0,0,0.8); }
.modal-header { padding: 20px; border-bottom: 1px solid var(--border-color); display: flex; justify-content: space-between; align-items: center; }
.modal-body { padding: 20px; overflow-y: auto; flex: 1; }
.modal-footer { padding: 20px; border-top: 1px solid var(--border-color); display: flex; gap: 15px; }
.close-btn { background: transparent; border: none; color: var(--text-muted); font-size: 24px; cursor: pointer; width: auto; padding: 0; }
.close-btn:hover { color: white; background: transparent;}

.about-content h3 { color: var(--primary-blue); margin-top: 25px; border-bottom: 1px solid var(--border-color); padding-bottom: 5px;}
.about-content p { color: var(--text-muted); font-size: 14px; line-height: 1.6;}

/* Mobile Media Queries */
@media (max-width: 900px) {
    body { flex-direction: column; padding: 10px; }
    .sidebar { 
        width: 100% !important; 
        max-width: 100% !important; 
        min-width: 0 !important;
        height: auto; 
        position: relative; 
        top: 0; 
        resize: none; 
        margin-bottom: 20px;
    }
    
    .brand-box-controls { flex-direction: column; }
    .control-item { width: 100%; }

    .tables-grid { grid-template-columns: 1fr; }
    .modal-content { width: 95%; }
    .metrics-row { flex-direction: column; }
    .metric-card { width: 100%; box-sizing: border-box; }
    .network-selector { justify-content: flex-start; gap: 15px; }
}