body {
    font-family: 'Inter', sans-serif;
    background-color: #FFFDE7; /* Light yellow background */
    color: #424242; /* Dark grey text for contrast */
}
.card {
    background-color: #FFF9C4; /* Lighter yellow for cards */
    border: 1px solid #FDD835; /* Yellow border */
    border-radius: 0.75rem; /* Rounded corners */
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: all 0.3s ease-in-out;
}
.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px rgba(0,0,0,0.1);
}
.button {
    background-color: #FDD835; /* Main yellow for buttons */
    color: #424242; /* Dark text on yellow button */
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s ease;
    margin-top: 0.5rem;
    margin-right: 0.5rem;
    height: 3.5rem;
    line-height: 1.5rem;  
}
.button:hover {
    background-color: #FBC02D; /* Darker yellow on hover */
}
.button-secondary {
    background-color: #FFF176; /* Lighter yellow for secondary actions */
    color: #424242;
    height: 3.5rem;
    line-height: 1.5rem;
}
.button-secondary:hover {
    background-color: #FDD835;
}
.entity {
    background-color: #FFEE58; /* Medium yellow for entities */
    padding: 1rem;
    border-radius: 0.5rem;
    text-align: center;
    font-weight: 500;
    margin: 0.5rem;
    border: 1px solid #FBC02D;
}
.bitcoin-network {
    background-color: #FFB300; /* Orange-yellow for Bitcoin network */
    color: white;
}
.committee {
    background-color: #FFD54F; /* Amber-yellow for Committee */
}
.info-box {
    background-color: #FFFFE0; /* Very light yellow for info */
    border-left: 4px solid #FDD835;
    padding: 1rem;
    margin-top: 1rem;
    border-radius: 0.25rem;
}
.phase-title {
    color: #C0A000; /* Darker yellow for titles */
    font-weight: 700;
    font-size: 1.5rem; /* Increased font size */
    margin-bottom: 1rem;
}
.arrow {
    font-size: 1.5rem;
    color: #FBC02D;
    margin: 0 0.5rem;
}
.utxo {
    display: inline-block;
    background-color: #FFCA28;
    padding: 0.25rem 0.75rem;
    border-radius: 0.25rem;
    font-weight: bold;
    color: #3E2723;
    border: 1px solid #FFA000;
}
.signature-part {
    display: inline-block;
    background-color: #FFF59D;
    padding: 0.25rem 0.75rem;
    border-radius: 0.25rem;
    font-style: italic;
    color: #5D4037;
    border: 1px solid #FBC02D;
}
/* Animation for highlighting steps */
.step-active {
    border: 2px solid #C0A000 !important; /* Prominent border for active step */
    box-shadow: 0 0 15px rgba(253, 216, 53, 0.7); /* Yellow glow */
}
.hidden {
    display: none;
}
.current-owner-label {
    font-weight: bold;
    color: #AD8E00;
}