/* Tận dụng các biến từ leaderboard.css */
.rule-card {
    background: var(--card-bg);
    border-radius: 15px;
    padding: 25px;
    margin-bottom: 25px;
    border-left: 5px solid var(--accent-color);
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}

.rule-card h2 {
    color: var(--accent-color);
    margin-top: 0;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid #30363d;
    padding-bottom: 10px;
}

.grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

@media (max-width: 768px) {
    .grid { grid-template-columns: 1fr; }
}

.sub-card {
    background: rgba(255,255,255,0.03);
    padding: 15px;
    border-radius: 10px;
}

.highlight {
    border: 1px dashed var(--gold);
}

.note {
    font-size: 0.85rem;
    color: #ffb86c;
    background: rgba(255, 184, 108, 0.1);
    padding: 10px;
    border-radius: 5px;
    margin-top: 15px;
}

.small-table {
    width: 100%;
    font-size: 0.9rem;
}

.danger {
    color: #ff5555;
}

.titles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-top: 15px;
}

.title-item {
    background: linear-gradient(135deg, #2c3e50, #000);
    padding: 15px;
    border-radius: 10px;
    text-align: center;
    border: 1px solid #444;
}

.title-item h4 {
    color: var(--gold);
    margin: 0 0 5px 0;
}

/* Tối ưu ảnh Donate */
.donate-img {
    max-width: 250px;
    width: 100%;
    border-radius: 15px;
    border: 3px solid var(--accent-color);
    box-shadow: 0 0 20px rgba(161, 255, 206, 0.3);
    transition: transform 0.3s ease;
}

.donate-img:hover {
    transform: scale(1.05);
}

/* List rules style */
.custom-list-rules {
    list-style: none;
    padding: 0;
}

.custom-list-rules li {
    padding: 10px 0;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    position: relative;
    padding-left: 25px;
}

.custom-list-rules li::before {
    content: "•";
    color: var(--accent-color);
    font-weight: bold;
    position: absolute;
    left: 0;
}