/* 基础重置与全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    color: #ffffff;
    background: radial-gradient(circle, rgb(0, 0, 139), transparent);
    animation: aurora-move 15s linear infinite;
}

a {
    color: #00ffea;
    text-decoration: none;
    rel: nofollow;
}

a:hover {
    text-decoration: underline;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    padding: 50px 0;
    background: linear-gradient(135deg, #00008B, #4B0082);
    border-bottom: 2px solid #00ffea;
}

header h1 {
    font-size: 3em;
    margin-bottom: 10px;
}

header p {
    font-size: 1.2em;
    color: #00ffea;
}

nav {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 20px;
}

nav a {
    padding: 10px 15px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 5px;
    transition: background 0.3s ease;
}

nav a:hover {
    background: rgba(255, 255, 255, 0.2);
}

.main {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 40px;
}

.card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    padding: 20px;
    flex: 1 1 calc(33.333% - 40px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.2);
}

.card img {
    width: 100%;
    height: auto;
    border-radius: 5px;
    margin-bottom: 15px;
}

.card h3 {
    margin-bottom: 10px;
    font-size: 1.5em;
    color: #00ffea;
}

.card p {
    font-size: 1em;
    color: #ffffff;
}

footer {
    text-align: center;
    padding: 30px 0;
    background: linear-gradient(135deg, #4B0082, #00008B);
    margin-top: 50px;
}

footer p {
    font-size: 1em;
    color: #00ffea;
}

/* 按钮样式 */
button {
    position: relative;
    overflow: hidden;
    background-color: #007BFF;
    color: white;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
    border-radius: 5px;
    transition: transform 0.3s ease, background-color 0.3s ease;
}

button:hover {
    transform: scale(1.05);
    background-color: #0056b3;
}

button::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    animation: ripple 0.6s ease-out;
    opacity: 0;
}

button:active::before {
    width: 200px;
    height: 200px;
    opacity: 1;
    transition: width 0s, height 0s, opacity 0s;
}

@keyframes ripple {
    0% {
        width: 0;
        height: 0;
        opacity: 1;
    }
    100% {
        width: 200px;
        height: 200px;
        opacity: 0;
    }
}

/* 背景动画 */
@keyframes aurora-move {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

/* 响应式设计 */
@media (max-width: 1440px) {
    .card {
        flex: 1 1 calc(33.333% - 40px);
    }
}

@media (max-width: 1200px) {
    .card {
        flex: 1 1 calc(50% - 40px);
    }
}

@media (max-width: 1024px) {
    header h1 {
        font-size: 2.5em;
    }
    .card {
        flex: 1 1 calc(50% - 40px);
    }
}

@media (max-width: 768px) {
    .main {
        flex-direction: column;
    }
    .card {
        flex: 1 1 100%;
    }
    nav {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 2em;
    }
    nav a {
        padding: 8px 12px;
        font-size: 0.9em;
    }
}

@media (max-width: 320px) {
    header h1 {
        font-size: 1.5em;
    }
    .card h3 {
        font-size: 1.2em;
    }
    .card p {
        font-size: 0.9em;
    }
}