/* 基础样式 */
body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
    color: #ffffff;
    background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
    background-size: 300% 300%;
    animation: gradient-animation 15s ease infinite;
}

@keyframes gradient-animation {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.container {
    display: flex;
    flex-direction: row;
    min-height: 100vh;
    padding: 20px;
}

nav {
    flex: 1;
    max-width: 250px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    margin-right: 20px;
}

nav ul {
    list-style: none;
    padding: 0;
}

nav ul li {
    margin-bottom: 15px;
}

nav ul li a {
    color: #ffffff;
    text-decoration: none;
    font-size: 18px;
    transition: color 0.3s ease;
}

nav ul li a:hover {
    color: #00ffcc;
}

main {
    flex: 3;
    padding: 20px;
    background: rgba(0, 0, 0, 0.5);
    border-radius: 10px;
    overflow-y: auto;
}

h1, h2, h3, h4 {
    color: #00ffff;
}

p, ul, ol, table, pre, code {
    color: #ffffff;
    line-height: 1.6;
}

h1 {
    font-size: 36px;
    margin-bottom: 20px;
}

h2 {
    font-size: 28px;
    margin-top: 30px;
    margin-bottom: 15px;
}

h3 {
    font-size: 24px;
    margin-top: 25px;
    margin-bottom: 10px;
}

h4 {
    font-size: 20px;
    margin-top: 20px;
    margin-bottom: 8px;
}

ul, ol {
    padding-left: 20px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

table, th, td {
    border: 1px solid #00ffff;
}

th, td {
    padding: 10px;
    text-align: left;
}

pre {
    background: rgba(255, 255, 255, 0.1);
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
}

code {
    background: rgba(255, 255, 255, 0.2);
    padding: 2px 4px;
    border-radius: 3px;
}

button {
    background-color: #00ffcc;
    border: none;
    padding: 10px 20px;
    color: #000000;
    font-size: 16px;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
}

button:hover {
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.8);
    transform: scale(1.1);
}

.card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    padding: 20px;
    margin: 20px 0;
    display: flex;
    align-items: center;
    transition: transform 0.3s ease;
}

.card:hover {
    transform: scale(1.05);
}

.card img {
    width: 80px;
    height: 80px;
    border-radius: 10px;
    margin-right: 20px;
}

.container-fluid {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
}

.container-fluid .image-item {
    width: 48%;
    margin-bottom: 20px;
}

.container-fluid .image-item img {
    width: 100%;
    border-radius: 10px;
}

@media (max-width: 1440px) {
    .container {
        padding: 15px;
    }

    nav {
        max-width: 220px;
    }

    main {
        padding: 15px;
    }
}

@media (max-width: 1200px) {
    .container {
        flex-direction: column;
    }

    nav {
        max-width: 100%;
        margin-right: 0;
        margin-bottom: 20px;
    }

    main {
        max-width: 100%;
    }

    .container-fluid .image-item {
        width: 100%;
    }
}

@media (max-width: 1024px) {
    h1 {
        font-size: 32px;
    }

    h2 {
        font-size: 26px;
    }

    h3 {
        font-size: 22px;
    }

    h4 {
        font-size: 18px;
    }

    nav ul li a {
        font-size: 16px;
    }

    button {
        font-size: 14px;
    }
}

@media (max-width: 768px) {
    h1 {
        font-size: 28px;
    }

    h2 {
        font-size: 24px;
    }

    h3 {
        font-size: 20px;
    }

    h4 {
        font-size: 16px;
    }

    nav ul li a {
        font-size: 14px;
    }

    .card {
        flex-direction: column;
        align-items: flex-start;
    }

    .card img {
        margin-bottom: 10px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 24px;
    }

    h2 {
        font-size: 20px;
    }

    h3 {
        font-size: 18px;
    }

    h4 {
        font-size: 14px;
    }

    nav ul li a {
        font-size: 12px;
    }

    button {
        font-size: 12px;
        padding: 8px 16px;
    }

    .container-fluid .image-item {
        width: 100%;
    }
}

@media (max-width: 320px) {
    h1 {
        font-size: 20px;
    }

    h2 {
        font-size: 18px;
    }

    h3 {
        font-size: 16px;
    }

    h4 {
        font-size: 12px;
    }

    nav ul li a {
        font-size: 10px;
    }

    button {
        font-size: 10px;
        padding: 6px 12px;
    }

    .card {
        padding: 15px;
    }
}