.sidebar-filters {
    width: 240px;
    flex-shrink: 0;
    box-sizing: border-box;
    background: var(--bg-card, rgba(31, 41, 55, 0.6));
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 24px;
    position: sticky;
    top: calc(var(--header-height, 80px) + 30px);
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    overflow-x: hidden;
    backdrop-filter: blur(20px);
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar-filters:hover {
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: 
        0 12px 40px rgba(0, 0, 0, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

.sidebar-filters::-webkit-scrollbar {
    width: 6px;
}

.sidebar-filters::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 3px;
}

.sidebar-filters::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-color-dark));
    border-radius: 3px;
    transition: background 0.3s ease;
}

.sidebar-filters::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, var(--primary-color-dark), var(--primary-color));
}

.sidebar-filters .filter-section {
    margin-bottom: 28px;
    padding-bottom: 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    transition: all 0.3s ease;
}

.sidebar-filters .filter-section:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.sidebar-filters .filter-section:hover {
    border-bottom-color: rgba(255, 255, 255, 0.12);
}

.sidebar-filters .filter-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    cursor: pointer;
    user-select: none;
}

.sidebar-filters .filter-title {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-primary, #ffffff);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: color 0.3s ease;
}

.sidebar-filters .filter-title::before {
    content: '';
    width: 3px;
    height: 16px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-color-dark));
    border-radius: 2px;
    display: inline-block;
}

.sidebar-filters .filter-toggle {
    font-size: 10px;
    color: var(--text-secondary, #9ca3af);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), color 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.05);
}

.sidebar-filters .filter-header:hover .filter-toggle {
    color: var(--primary-color);
    background: rgba(var(--primary-color-rgb, 34, 197, 94), 0.1);
}

.sidebar-filters .filter-section.collapsed .filter-toggle {
    transform: rotate(180deg);
}

.sidebar-filters .filter-content {
    display: block;
    animation: slideDown 0.3s ease-out;
}

.sidebar-filters .filter-section.collapsed .filter-content {
    display: none;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.sidebar-filters .genres-section .filter-content {
    padding: 0;
}

.sidebar-filters .genre-scroll {
    max-height: 320px;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 4px;
    margin: -4px;
    border-radius: 12px;
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.2) transparent;
}

.sidebar-filters .genre-scroll::-webkit-scrollbar {
    width: 4px;
}

.sidebar-filters .genre-scroll::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar-filters .genre-scroll::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 2px;
}

.sidebar-filters .genre-scroll::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

.sidebar-filters .filter-options {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.sidebar-filters .filter-option {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    background: transparent;
    border: 1px solid transparent;
    position: relative;
    overflow: hidden;
}

.sidebar-filters .filter-option::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 0;
    background: linear-gradient(90deg, var(--primary-color), transparent);
    transition: width 0.3s ease;
    opacity: 0.1;
}

.sidebar-filters .filter-option:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
    transform: translateX(4px);
}

.sidebar-filters .filter-option:hover::before {
    width: 100%;
}

.sidebar-filters .filter-option.active {
    background: linear-gradient(135deg, 
        rgba(var(--primary-color-rgb, 34, 197, 94), 0.15), 
        rgba(var(--primary-color-rgb, 34, 197, 94), 0.08));
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.sidebar-filters .filter-option.active::before {
    width: 100%;
    opacity: 0.2;
}

.sidebar-filters .filter-checkbox {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 4px;
    background: transparent;
    position: relative;
    flex-shrink: 0;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.sidebar-filters .filter-option:hover .filter-checkbox {
    border-color: var(--primary-color);
}

.sidebar-filters .filter-checkbox.checked,
.sidebar-filters .filter-option.active .filter-checkbox {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-color-dark));
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(var(--primary-color-rgb, 34, 197, 94), 0.2);
}

.sidebar-filters .filter-checkbox.checked::after,
.sidebar-filters .filter-option.active .filter-checkbox::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 12px;
    font-weight: 700;
    line-height: 1;
}

.sidebar-filters .filter-label {
    flex: 1;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary, #9ca3af);
    transition: color 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.sidebar-filters .filter-option.active .filter-label {
    color: var(--text-primary, #ffffff);
    font-weight: 600;
}

.sidebar-filters .filter-count {
    font-size: 12px;
    color: var(--text-muted, #6b7280);
    opacity: 0.6;
}

.sidebar-filters .more-filters {
    margin-top: 8px;
    padding-top: 12px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.sidebar-filters .more-genres {
    font-size: 12px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.sidebar-filters .more-genres:hover {
    color: var(--primary-color);
}

.sidebar-filters .more-genres::after {
    content: '→';
    font-size: 10px;
    transition: transform 0.2s ease;
}

.sidebar-filters .more-genres:hover::after {
    transform: translateX(2px);
}

/* ============================================
   BPM 滑块样式
   ============================================ */
.sidebar-filters .bpm-slider {
    margin-top: 8px;
}

.sidebar-filters .bpm-track {
    position: relative;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    margin-bottom: 16px;
    cursor: pointer;
}

.sidebar-filters .bpm-fill {
    position: absolute;
    height: 100%;
    left: 20%;
    width: 60%;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-color-dark));
    border-radius: 3px;
    box-shadow: 0 0 10px rgba(var(--primary-color-rgb, 34, 197, 94), 0.5);
    transition: all 0.3s ease;
}

.sidebar-filters .bpm-handle {
    position: absolute;
    top: 50%;
    width: 18px;
    height: 18px;
    background: white;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    cursor: grab;
    box-shadow: 
        0 2px 8px rgba(0, 0, 0, 0.3),
        0 0 0 3px rgba(var(--primary-color-rgb, 34, 197, 94), 0.3);
    transition: all 0.2s ease;
    border: 2px solid var(--primary-color);
}

.sidebar-filters .bpm-handle:hover {
    transform: translate(-50%, -50%) scale(1.2);
    box-shadow: 
        0 4px 12px rgba(0, 0, 0, 0.4),
        0 0 0 4px rgba(var(--primary-color-rgb, 34, 197, 94), 0.4);
}

.sidebar-filters .bpm-handle:active {
    cursor: grabbing;
    transform: translate(-50%, -50%) scale(1.1);
}

.sidebar-filters .bpm-handle.left {
    left: 20%;
}

.sidebar-filters .bpm-handle.right {
    left: 80%;
}

.sidebar-filters .bpm-values {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    padding: 0 4px;
}

.sidebar-filters .bpm-min,
.sidebar-filters .bpm-max {
    padding: 6px 12px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    min-width: 50px;
    text-align: center;
    transition: all 0.2s ease;
}

.sidebar-filters .bpm-min:hover,
.sidebar-filters .bpm-max:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* ============================================
   调性网格样式
   ============================================ */
.sidebar-filters .key-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 6px;
    margin-top: 8px;
    padding: 4px 0;
}

.sidebar-filters .key-item {
    padding: 8px 6px;
    text-align: center;
    border: 1.5px solid rgba(148, 163, 184, 0.3);
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.7);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    background: rgba(15, 23, 42, 0.4);
    position: relative;
    overflow: hidden;
    min-height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.sidebar-filters .key-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    opacity: 0;
    transition: opacity 0.2s ease;
    border-radius: 20px;
}

.sidebar-filters .key-item:hover {
    border-color: var(--primary-color);
    color: #ffffff;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(34, 197, 94, 0.25);
    background: rgba(15, 23, 42, 0.6);
}

.sidebar-filters .key-item:hover::before {
    opacity: 0.15;
}

.sidebar-filters .key-item.selected {
    background: linear-gradient(135deg, 
        rgba(34, 197, 94, 0.25), 
        rgba(22, 163, 74, 0.2));
    border-color: var(--primary-color);
    color: var(--primary-color);
    box-shadow: 
        0 0 0 1px rgba(34, 197, 94, 0.4),
        0 2px 8px rgba(34, 197, 94, 0.3);
    font-weight: 700;
}

.sidebar-filters .key-item.selected::before {
    opacity: 0.25;
}

/* ============================================
   仅包含选项样式
   ============================================ */
.sidebar-filters .include-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 8px;
}

.sidebar-filters .include-option {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
    background: transparent;
    border: 1px solid transparent;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    user-select: none;
}

.sidebar-filters .include-option:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.sidebar-filters .include-option input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin: 0;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 4px;
    background: transparent;
    position: relative;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    flex-shrink: 0;
}

.sidebar-filters .include-option input[type="checkbox"]:hover {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(var(--primary-color-rgb, 34, 197, 94), 0.1);
}

.sidebar-filters .include-option input[type="checkbox"]:checked {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-color-dark));
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(var(--primary-color-rgb, 34, 197, 94), 0.2);
}

.sidebar-filters .include-option input[type="checkbox"]:checked::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 12px;
    font-weight: 700;
    line-height: 1;
}

.sidebar-filters .include-option input[type="checkbox"]:checked + * {
    color: var(--primary-color);
    font-weight: 600;
}

/* ============================================
   范围输入框样式
   ============================================ */
.sidebar-filters .range-inputs {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
}

.sidebar-filters .range-input {
    flex: 1;
    min-width: 70px;
    max-width: 90px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 6px;
    color: #ffffff;
    padding: 8px 10px;
    font-size: 13px;
    transition: all 0.2s ease;
    box-sizing: border-box;
    height: 36px;
}

.sidebar-filters .range-input:hover {
    border-color: rgba(255, 255, 255, 0.25);
    background: rgba(255, 255, 255, 0.12);
}

.sidebar-filters .range-input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 0 0 3px rgba(var(--primary-color-rgb, 34, 197, 94), 0.14);
}

.sidebar-filters .range-input::placeholder {
    color: rgba(255, 255, 255, 0.4);
}

.sidebar-filters .range-separator {
    color: #6b7280;
    font-weight: 500;
    font-size: 14px;
}

/* ============================================
   筛选操作按钮样式
   ============================================ */
.sidebar-filters .filter-actions {
    display: flex;
    gap: 10px;
    margin: 12px 0 4px;
}

.sidebar-filters .filter-apply-btn {
    flex: 1;
    padding: 10px 16px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-color-dark));
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px rgba(var(--primary-color-rgb, 34, 197, 94), 0.3);
}

.sidebar-filters .filter-apply-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(var(--primary-color-rgb, 34, 197, 94), 0.4);
}

.sidebar-filters .filter-reset-btn {
    flex: 1;
    padding: 10px 16px;
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.sidebar-filters .filter-reset-btn:hover {
    color: var(--primary-color);
    border-color: var(--primary-color);
    background: rgba(var(--primary-color-rgb, 34, 197, 94), 0.1);
}

@media (max-width: 1024px) {
    .sidebar-filters {
        position: static;
        width: 100%;
        max-height: none;
        margin-bottom: 24px;
    }
}

@media (max-width: 768px) {
    .sidebar-filters {
        padding: 20px;
        border-radius: 12px;
    }

    .sidebar-filters .filter-section {
        margin-bottom: 24px;
        padding-bottom: 20px;
    }

    .sidebar-filters .key-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 6px;
    }
    
    .sidebar-filters .key-item {
        padding: 6px 4px;
        font-size: 11px;
        min-height: 28px;
    }

    .sidebar-filters .key-item {
        padding: 8px 4px;
        font-size: 12px;
    }
}

.sidebar-filters .filter-section {
    animation: fadeInUp 0.4s ease-out backwards;
}

.sidebar-filters .filter-section:nth-child(1) { animation-delay: 0.1s; }
.sidebar-filters .filter-section:nth-child(2) { animation-delay: 0.2s; }
.sidebar-filters .filter-section:nth-child(3) { animation-delay: 0.3s; }
.sidebar-filters .filter-section:nth-child(4) { animation-delay: 0.4s; }

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.sort-select,
.filter-select {
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    color: var(--text-primary, #ffffff);
    cursor: pointer;
}

.sort-select option,
.filter-select option {
    background-color: var(--bg-card, #1f2937) !important;
    color: var(--text-primary, #ffffff) !important;
    padding: 8px 12px;
}


.sidebar-filters .filter-actions {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.sidebar-filters .filter-reset-btn {
    width: 100%;
    padding: 12px 20px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.sidebar-filters .filter-reset-btn:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.sidebar-filters .filter-reset-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

.sidebar-filters .btn-secondary {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.3);
    color: #ef4444;
}

.sidebar-filters .btn-secondary:hover {
    background: rgba(239, 68, 68, 0.2);
    border-color: rgba(239, 68, 68, 0.5);
    color: #f87171;
}