/* 全局样式定义 */
body {
    margin: 0;
    font-family: 'Helvetica Regular', sans-serif;
    color: #333;
    background: linear-gradient(135deg, #1A237E, #29B6F6);
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}
h1, h2, h3 {
    font-family: 'Roboto Bold', sans-serif;
    color: #ECEFF1;
}
.container {
    max-width: 1440px;
    width: 95%;
    margin: auto;
    display: grid;
    gap: 20px;
}
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(26, 35, 126, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 10px 0;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
.navbar a {
    color: #ECEFF1;
    text-decoration: none;
    margin: 0 15px;
    font-size: 18px;
    transition: all 0.3s ease;
}
.navbar a:hover {
    color: #29B6F6;
    transform: scale(1.1);
}
.card {
    background: #ECEFF1;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}
.card:hover {
    transform: translateY(-10px);
}
button {
    background: linear-gradient(to right, #29B6F6, #1A237E);
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
}
button:hover {
    background: linear-gradient(to right, #1A237E, #29B6F6);
    transform: scale(1.05);
}
@media (min-width: 768px) {
    .container {
        grid-template-columns: repeat(2, 1fr);
    }
}
@media (min-width: 1024px) {
    .container {
        grid-template-columns: repeat(3, 1fr);
    }
}
@media (min-width: 1440px) {
    .container {
        grid-template-columns: repeat(4, 1fr);
    }
}
.footer {
    background: #1A237E;
    color: #ECEFF1;
    padding: 20px;
    text-align: center;
    width: 100%;
    margin-top: auto;
}