:root {
    --primary: #3498db;
    --secondary: #2ecc71;
    --accent: #e74c3c;
    --light: #f8f9fa;
    --dark: #2c3e50;
    --gray: #6c757d;
}

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    color: var(--dark);
    background-color: #f5f7fa;
    line-height: 1.6;
}

.navbar {
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    padding: 0.8rem 0;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary) !important;
}

.nav-link {
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    transition: all 0.3s;
}

.nav-link:hover {
    color: var(--primary) !important;
}

.breadcrumb-wrapper {
    background: var(--light);
    padding: 1rem 0;
    margin-bottom: 2rem;
}

.breadcrumb {
    background: none;
    margin: 0;
    padding: 0;
}

.breadcrumb-item a {
    color: var(--primary);
    text-decoration: none;
}

.breadcrumb-item.active {
    color: var(--gray);
}

.breadcrumb-item + .breadcrumb-item::before {
    content: ">";
    color: var(--gray);
}

/* Ò³½ÅÑùʽ */
.footer {
    background: var(--dark);
    color: white;
    padding: 3rem 0 1.5rem;
}

.footer h5 {
    font-weight: 600;
    margin-bottom: 1.2rem;
    color: var(--accent-color);
}

.footer a {
    color: rgba(255, 255, 255, 0.8);
    transition: var(--transition);
}

.footer a:hover {
    color: white;
    text-decoration: none;
}

.footer ul li {
    margin-bottom: 0.5rem;
}

.grey-color {
    color: rgba(255, 255, 255, 0.7);
}

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--primary);
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 3px 10px rgba(0,0,0,0.2);
    transition: all 0.3s;
    z-index: 1000;
}

.back-to-top:hover {
    background: #2980b9;
    transform: translateY(-3px);
    color: white;
}

@media (max-width: 768px) {
    .navbar-nav .nav-link {
        padding: 0.5rem 0;
        margin: 0.2rem 0;
    }
}