/* ============================
   全局重置与基础字体
============================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
}

/* ============================
   固定导航栏样式
============================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    display: flex;
    justify-content: center;
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    padding: 10px 20px;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    padding: 8px 20px;
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.nav-container {
    width: 100%;
    max-width: 1200px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-image {
    height: 50px;
    border-radius: 50%;
    border: 2px solid #007bff;
    box-shadow: 0 0 10px rgba(0, 123, 255, 0.3);
}

.logo-text {
    font-size: 1.4rem;
    font-weight: bold;
    color: #0066cc;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

/* ============================
   导航链接样式
============================ */
.nav-links {
    display: flex;
    list-style: none;
    gap: 15px;
    padding: 0;
    margin: 0;
}

.nav-links li {
    margin: 0;
}

.nav-links a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    padding: 10px 18px;
    border-radius: 20px;
    transition: all 0.3s ease;
}

.nav-links a:hover {
    background-color: rgba(0, 123, 255, 0.1);
    transform: translateY(-2px);
}

.nav-links a.active {
    background-color: #007bff;
    color: white;
    box-shadow: 0 2px 8px rgba(0, 123, 255, 0.3);
}

/* ============================
   移动端菜单按钮
============================ */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.8rem;
    color: #007bff;
    cursor: pointer;
    padding: 5px;
}

/* ============================
   移动端样式
============================ */
@media (max-width: 900px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: white;
        flex-direction: column;
        padding: 20px;
        text-align: center;
        z-index: 100;
        box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
        border-radius: 0 0 10px 10px;
    }

    .nav-links.active {
        display: flex;
    }

    .menu-toggle {
        display: block;
    }
}

/* 更小屏幕调整 */
@media (max-width: 600px) {
    .nav-links a {
        padding: 12px;
        font-size: 1.1rem;
    }
}