/* ==========================================================================
 * 统一跨页快捷切换胶囊导航 (全站互通)
 * 供 AyagawaSeirin 模板主页使用
 * ========================================================================== */
.seirin-quick-nav {
    position: fixed;
    top: 16px;
    right: 20px;
    z-index: 1000;
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(33, 33, 33, 0.88);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 6px 14px;
    border-radius: 30px;
    box-shadow: 0 6px 24px rgba(0,0,0,0.45);
    border: 1px solid rgba(255,255,255,0.18);
    font-size: 13px;
    animation: fadeInDown 0.3s ease;
}

.seirin-nav-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    border-radius: 20px;
    text-decoration: none;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid transparent;
    background: transparent;
    color: #e0e0e0;
    transition: all 0.2s;
    font-size: 12.5px;
    white-space: nowrap;
}

.seirin-nav-btn:hover {
    background: rgba(255,255,255,0.14);
    color: #ffffff;
}

.seirin-nav-btn.active {
    background: #e91e63;
    color: #ffffff;
    font-weight: 600;
    box-shadow: 0 2px 10px rgba(233, 30, 99, 0.4);
}

.seirin-nav-btn.highlight {
    background: linear-gradient(135deg, #1976d2 0%, #2196f3 100%);
    color: #ffffff;
    box-shadow: 0 2px 10px rgba(33, 150, 243, 0.4);
}

.seirin-nav-btn.highlight:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
}

.seirin-nav-divider {
    width: 1px;
    height: 16px;
    background: rgba(255,255,255,0.22);
    margin: 0 2px;
}

.seirin-music-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 11px;
    border-radius: 20px;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.16);
    color: #e0e0e0;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

.seirin-music-btn:hover {
    background: rgba(255,255,255,0.18);
    color: #fff;
}

.seirin-music-btn.playing {
    border-color: #e91e63;
    color: #f48fb1;
    background: rgba(233, 30, 99, 0.22);
}

.seirin-music-btn.playing i.fa-music {
    animation: musicSpin 3s linear infinite;
}

@keyframes musicSpin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@media (max-width: 900px) {
    .seirin-quick-nav {
        top: auto;
        bottom: 16px;
        right: 50%;
        transform: translateX(50%);
        padding: 5px 8px;
        gap: 3px;
    }
    .seirin-nav-btn {
        padding: 5px 9px;
        font-size: 12px;
    }
}