body {
    background-color: #0f172a;
    color: white;
    font-family: 'Segoe UI', system-ui, sans-serif;
    margin: 0;
    overflow-x: hidden;
    user-select: none;
}

/* 頂部資訊列 */
.top-bar {
    height: 60px;
    background: #1e293b;
    border-bottom: 1px solid #334155;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 15px;
    position: sticky;
    top: 0;
    z-index: 50;
}

/* 選單佈局 */
.menu-overlay {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 40px 20px;
}

.menu-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    width: 100%;
    max-width: 350px;
}

@media (min-width: 768px) {
    .menu-grid {
        grid-template-columns: 1fr 1fr;
        max-width: 800px;
        gap: 40px;
    }
}

.menu-col {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

/* 卡片按鈕樣式 */
.btn-card {
    background: #334155;
    width: 100%;
    padding: 20px;
    border-radius: 12px;
    text-decoration: none; /* 移除超連結底線 */
    color: inherit;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid transparent;
    display: flex;
    align-items: center;
    gap: 20px;
}

.btn-card:hover {
    transform: translateY(-4px);
    background: #3d4b5f;
    box-shadow: 0 10px 20px rgba(0,0,0,0.3);
}

.btn-card:active {
    transform: scale(0.96);
}

/* 針對特定顏色的微調 */
.btn-card span {
    filter: drop-shadow(0 4px 6px rgba(0,0,0,0.3));
}