/* ========== Filter Page ========== */
.filter-page {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 480px;
    margin: 0 auto;
    background: var(--bg-primary);
}

.filter-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
    background: var(--bg-card);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 301;
}

.filter-modal-title {
    font-size: 16px;
    font-weight: 700;
}

.filter-modal-close {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: none;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 18px;
    color: var(--text-secondary);
    text-decoration: none;
}

@media (min-width: 768px) and (max-width: 1024px) {
    .filter-page {
        max-width: 720px;
        padding: 20px;
    }
    
    .filter-modal-header {
        padding: 16px 20px;
    }
    
    .filter-modal-title {
        font-size: 18px;
    }
    
    .filter-modal-close {
        width: 36px;
        height: 36px;
        font-size: 20px;
    }
}

@media (min-width: 1025px) {
    .filter-page {
        max-width: 1440px;
        padding: 30px;
        background: var(--bg-primary);
        border-radius: var(--radius-xl);
        box-shadow: var(--shadow-lg);
        margin: 30px auto;
        min-height: calc(100vh - 60px);
    }
    
    .filter-modal-header {
        padding: 20px 30px;
        border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    }
    
    .filter-modal-title {
        font-size: 22px;
        font-weight: 800;
        color: var(--text-primary);
    }
    
    .filter-modal-close {
        width: 44px;
        height: 44px;
        font-size: 24px;
        background: var(--primary-light);
        color: var(--primary);
    }
    
    .filter-modal-close:hover {
        background: var(--primary);
        color: white;
    }
}

.filter-modal-body {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.filter-sidebar {
    width: 100px;
    background: var(--bg-primary);
    overflow-y: auto;
    flex-shrink: 0;
}

.filter-sidebar-item {
    padding: 14px 12px;
    font-size: 13px;
    color: var(--text-secondary);
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border-left: 3px solid transparent;
}

.filter-sidebar-item.active {
    background: var(--bg-card);
    color: var(--primary);
    font-weight: 600;
    border-left-color: var(--primary);
}

.filter-content {
    flex: 1;
    padding: 16px;
    overflow-y: auto;
    background: var(--bg-card);
}

.filter-section {
    margin-bottom: 20px;
}

.filter-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
}

.filter-section-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.filter-section-reset {
    font-size: 12px;
    color: var(--text-tertiary);
    cursor: pointer;
}

.filter-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.filter-option {
    padding: 8px 4px;
    text-align: center;
    font-size: 12px;
    color: var(--text-secondary);
    background: var(--bg-primary);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.filter-option:hover, .filter-option.active {
    background: var(--primary-light);
    color: var(--primary);
    border-color: var(--primary);
}

@media (min-width: 768px) and (max-width: 1024px) {
    .filter-sidebar {
        width: 120px;
    }
    
    .filter-sidebar-item {
        padding: 16px 14px;
        font-size: 14px;
    }
    
    .filter-content {
        padding: 20px;
    }
    
    .filter-section-title {
        font-size: 15px;
    }
    
    .filter-section-reset {
        font-size: 13px;
    }
    
    .filter-options {
        grid-template-columns: repeat(4, 1fr);
        gap: 10px;
    }
    
    .filter-option {
        padding: 10px 6px;
        font-size: 13px;
    }
}

@media (min-width: 1025px) {
    .filter-sidebar {
        width: 180px;
        background: var(--bg-card);
        border-right: 1px solid var(--border);
        border-radius: 0;
    }
    
    .filter-sidebar-item {
        padding: 16px 20px;
        font-size: 14px;
        text-align: left;
        border-left: 4px solid transparent;
    }
    
    .filter-sidebar-item.active {
        background: var(--bg-primary);
        border-left-color: var(--primary);
        font-weight: 700;
    }
    
    .filter-content {
        padding: 30px;
        background: var(--bg-card);
        border-radius: 0;
    }
    
    .filter-section {
        margin-bottom: 30px;
    }
    
    .filter-section-header {
        margin-bottom: 16px;
        padding-bottom: 12px;
        border-bottom: 1px solid var(--border);
    }
    
    .filter-section-title {
        font-size: 18px;
        font-weight: 700;
        color: var(--text-primary);
    }
    
    .filter-section-reset {
        font-size: 14px;
        color: var(--primary);
        font-weight: 500;
    }
    
    .filter-section-reset:hover {
        text-decoration: underline;
    }
    
    .filter-options {
        grid-template-columns: repeat(6, 1fr);
        gap: 14px;
    }
    
    .filter-option {
        padding: 14px 12px;
        font-size: 14px;
        border-radius: var(--radius-md);
    }
}

.filter-input-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
}

.filter-input {
    flex: 1;
    padding: 8px 10px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 13px;
    outline: none;
    text-align: center;
    font-family: inherit;
}

.filter-input:focus {
    border-color: var(--primary);
}

.filter-input-suffix {
    font-size: 12px;
    color: var(--text-tertiary);
}

.filter-modal-footer {
    display: flex;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-card);
    box-shadow: 0 -2px 10px rgba(0,0,0,0.06);
    position: sticky;
    bottom: 0;
}

.filter-reset-btn {
    flex: 1;
    padding: 12px;
    background: var(--bg-primary);
    color: var(--text-secondary);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.filter-reset-btn:hover {
    border-color: var(--text-tertiary);
}

.filter-confirm-btn {
    flex: 2;
    padding: 12px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(229, 57, 53, 0.3);
}

.filter-confirm-btn:hover {
    transform: translateY(-1px);
}

@media (min-width: 768px) and (max-width: 1024px) {
    .filter-modal-footer {
        padding: 14px 20px;
        gap: 16px;
    }
    
    .filter-reset-btn,
    .filter-confirm-btn {
        padding: 14px;
        font-size: 16px;
    }
}

@media (min-width: 1025px) {
    .filter-input {
        flex: 1;
        padding: 12px 16px;
        font-size: 15px;
        border-radius: var(--radius-md);
    }
    
    .filter-input-suffix {
        font-size: 14px;
    }
    
    .filter-modal-footer {
        padding: 20px 30px;
        gap: 20px;
        border-radius: 0 0 var(--radius-xl) var(--radius-xl);
    }
    
    .filter-reset-btn {
        padding: 16px 30px;
        font-size: 16px;
        border-radius: var(--radius-md);
        border-width: 2px;
    }
    
    .filter-confirm-btn {
        padding: 16px 40px;
        font-size: 16px;
        border-radius: var(--radius-md);
    }
}