/* ===== 首页样式切换悬浮按钮 =====
   复用各主题自己的 CSS 变量（--neon-blue / --neon-purple / --surface-bg / --glow-blue 等），
   使按钮样式自动跟随当前主题的按钮风格：圆形 + 霓虹描边 + hover 填充发光。 */
.home-theme-switch-btn {
    position: fixed;
    right: 18px;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    background: var(--surface-bg, rgba(42, 24, 80, 0.8));
    backdrop-filter: blur(10px);
    border: 1px solid var(--neon-blue, #b388eb);
    border-radius: 50%;
    color: var(--neon-blue, #b388eb);
    font-size: 20px;
    cursor: pointer;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition, all 0.4s cubic-bezier(0.4, 0, 0.2, 1));
    box-shadow: 0 0 12px var(--glow-blue, rgba(179, 136, 235, 0.3));
}
.home-theme-switch-btn:hover {
    background: var(--neon-blue, #b388eb);
    color: var(--primary-bg, #150a2e);
    transform: translateY(-50%) scale(1.1);
    box-shadow: 0 0 24px var(--neon-blue, #b388eb);
}

.home-theme-panel {
    position: fixed;
    right: 78px;
    top: 50%;
    transform: translateY(-50%);
    background: var(--secondary-bg, #1e1140);
    border: 1px solid var(--neon-blue, #b388eb);
    border-radius: 14px;
    padding: 10px;
    z-index: 9998;
    display: none;
    box-shadow: var(--card-glow, 0 0 30px rgba(0, 0, 0, 0.5));
    min-width: 190px;
}
.home-theme-panel.open {
    display: block;
    animation: themePanelIn .2s ease;
}
@keyframes themePanelIn {
    from { opacity: 0; transform: translateY(-50%) translateX(8px); }
    to   { opacity: 1; transform: translateY(-50%) translateX(0); }
}

.home-theme-panel .panel-title {
    font-family: 'Exo 2', 'Microsoft YaHei', sans-serif;
    font-size: 12px;
    letter-spacing: 2px;
    color: var(--text-muted, #9a8fc0);
    margin: 2px 8px 8px;
    text-transform: uppercase;
}
.home-theme-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: 10px;
    color: var(--text-primary, #efe9ff);
    font-family: 'Exo 2', 'Microsoft YaHei', sans-serif;
    font-size: 14px;
    text-decoration: none;
    transition: background .2s ease, color .2s ease;
}
.home-theme-option:hover {
    background: var(--glow-blue, rgba(179, 136, 235, 0.28));
    color: var(--text-primary, #fff);
}
.home-theme-option i {
    width: 18px;
    text-align: center;
    color: var(--neon-blue, #b388eb);
}
.home-theme-option.active {
    background: var(--glow-blue, rgba(179, 136, 235, 0.45));
    color: var(--text-primary, #fff);
    box-shadow: inset 0 0 0 1px var(--neon-blue, #e879f9);
}
.home-theme-option.active i {
    color: var(--neon-purple, #e879f9);
}