/* ===== 設定按鈕與側邊選單（含開關樣式）===== */
/* Side Menu Styles */
.settings-btn {
    position: fixed;
    top: 20px; right: 20px;
    width: 44px; height: 44px;
    background: var(--card-bg);
    border: var(--card-border);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    z-index: 1000;
    color: var(--text-color);
}

.settings-btn svg { width: 24px; height: 24px; transition: transform 0.5s; }
.settings-btn:hover svg { transform: rotate(90deg); }

.menu {
    position: fixed;
    top: 75px; right: 20px;
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: var(--card-border);
    border-radius: 16px;
    padding: 10px;
    display: none;
    flex-direction: column;
    gap: 5px;
    z-index: 1000;
    width: min(max(240px, 22vw), 340px, calc(100vw - 40px)); /* 依視窗佔比縮放，最小 240px、大螢幕 340px 封頂，極窄螢幕兩側各留 20px */
    max-height: calc(100vh - 265px); /* top 75px + 恐龍區 180px + 間距 10px，底端停在恐龍活動區之上 */
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--primary-color) transparent;
}

.menu::-webkit-scrollbar {
    width: 4px;
}

.menu::-webkit-scrollbar-track {
    background: transparent;
}

.menu::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 10px;
}

.menu.active { display: flex; }

.menu-brand {
    font-size: 1.1rem; font-weight: 800; text-align: center;
    color: var(--primary-color); padding: 8px 15px 6px;
    letter-spacing: 0.5px;
}

.menu-section-title {
    font-size: 0.7rem; color: var(--text-color); opacity: 0.5;
    padding: 5px 15px; text-transform: uppercase; letter-spacing: 1px;
}

.menu-item {
    padding: 10px 15px; border-radius: 10px; cursor: pointer;
    font-size: 0.9rem; font-weight: 600; text-align: left;
}
.menu-item:hover { background: rgba(255, 255, 255, 0.1); }

.menu-item-switch {
    display: flex; justify-content: space-between;
    align-items: center; padding: 10px 15px;
    font-size: 0.9rem; font-weight: 600;
}

.switch { position: relative; display: inline-block; width: 34px; height: 20px; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider {
    position: absolute; cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: rgba(255,255,255,0.1);
    transition: .4s; border-radius: 20px;
}
.slider:before {
    position: absolute; content: "";
    height: 14px; width: 14px;
    left: 3px; bottom: 3px;
    background-color: white;
    transition: .4s; border-radius: 50%;
}
input:checked + .slider { background-color: var(--primary-color); }
input:checked + .slider:before { transform: translateX(14px); }


/* RWD */
@media (max-width: 480px) {
    .settings-btn { top: 15px; right: 15px; }
}