.collapsible {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.collapsible.expanded {
    max-height: 1000px;
}

.sidebar {
    position: fixed;
    top: 80px;
    left: 0;
    width: 320px;
    height: calc(100vh - 80px);
    overflow-y: auto;
    z-index: 10;
}

.main-content {
    margin-left: 320px;
    margin-top: 80px;
}

.main-content-full {
    margin-left: 0;
    margin-top: 80px;
    padding-top: 3rem;
}

.gradient-text {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.chart-container {
    position: relative;
    height: 200px;
    width: 100%;
}

.breadcrumb {
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
    padding-top: 1rem;
    margin-top: 80px;
}

.logo-hover {
    transition: all 0.3s ease;
}

.logo-hover:hover {
    transform: scale(1.05) rotate(5deg);
}

.title-hover {
    transition: all 0.3s ease;
    cursor: pointer;
}

.title-hover:hover {
    transform: translateX(5px);
}

.back-btn {
    transition: all 0.3s ease;
}

.back-btn:hover {
    transform: translateX(-5px);
    background: rgba(59, 130, 246, 0.1);
}

/* 滚动条样式 */
.sidebar::-webkit-scrollbar { width: 6px; }
.sidebar::-webkit-scrollbar-track { background: var(--bg-tertiary); }
.sidebar::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 3px; }
.sidebar::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }

.centered-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

.main-content-with-padding {
    margin-left: 0;
    margin-top: 60px;
    padding-top: 3rem;
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 2rem;
    padding-right: 2rem;
}

/* 学科图标样式 */
.field-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 4px;
    font-size: 12px;
    margin-right: 8px;
}

.icon-biology { background: linear-gradient(135deg, #10b981, #059669); color: white; }
.icon-medicine { background: linear-gradient(135deg, #ef4444, #dc2626); color: white; }
.icon-physics { background: linear-gradient(135deg, #3b82f6, #2563eb); color: white; }
.icon-chemistry { background: linear-gradient(135deg, #f59e0b, #d97706); color: white; }
.icon-neuroscience { background: linear-gradient(135deg, #8b5cf6, #7c3aed); color: white; }
.icon-multidisciplinary { background: linear-gradient(135deg, #6366f1, #4f46e5); color: white; }
.icon-materials { background: linear-gradient(135deg, #06b6d4, #0891b2); color: white; }
.icon-environmental { background: linear-gradient(135deg, #22c55e, #16a34a); color: white; }
.icon-all { background: linear-gradient(135deg, #64748b, #475569); color: white; }

/* 移动设备适配 */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -320px;
        transition: left 0.3s ease;
        z-index: 30;
    }

    .sidebar.mobile-open {
        left: 0;
    }

    .main-content {
        margin-left: 0;
    }

    .main-content-full {
        padding: 1rem;
    }

    .centered-container {
        padding: 0 1rem;
    }

    .palette-grid {
        grid-template-columns: repeat(1, 1fr);
        gap: 16px;
    }

    .figures-grid-multiple {
        grid-template-columns: repeat(1, 1fr);
    }
}