/* 全局样式定义 */
:root {
    --primary-bg: linear-gradient(135deg, #121212, #1e1e1e);
    --secondary-bg: linear-gradient(135deg, #1a1a1a, #262626);
    --highlight-color: #4CAF50;
    --accent-color: #673ab7;
    --text-color: #ffffff;
    --border-color: rgba(255, 255, 255, 0.1);
    --card-hover-scale: 1.05;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Roboto', sans-serif;
    background: var(--primary-bg);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Montserrat', sans-serif;
    font-weight: bold;
    margin-bottom: 1rem;
    color: var(--accent-color);
}

p {
    font-size: 1rem;
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

a {
    color: var(--highlight-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #ff9800;
}

.container {
    max-width: 1200px;
    width: 90%;
    margin: auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    padding: 2rem 0;
}

.card {
    background: var(--secondary-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 1.5rem;
    transition: transform 0.3s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
}

.card:hover {
    transform: scale(var(--card-hover-scale));
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-links a {
    font-size: 1rem;
    padding: 0.5rem 1rem;
    border-radius: 5px;
}

.nav-links a:hover {
    background: var(--highlight-color);
    color: #000;
}

.hero-section {
    height: 100vh;
    background: linear-gradient(135deg, #1e1e1e, #2c2c2c), url('https://images.gptkong.com/demo/sample1.png') no-repeat center/cover;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: var(--text-color);
}

.hero-section h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero-section p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

.cta-button {
    background: var(--highlight-color);
    color: #000;
    padding: 0.8rem 2rem;
    border-radius: 5px;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.3s ease;
}

.cta-button:hover {
    background: #ff9800;
}

.section {
    padding: 4rem 0;
    background: var(--secondary-bg);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.code-block {
    background: #222;
    color: #fff;
    padding: 1rem;
    border-radius: 5px;
    overflow-x: auto;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 2rem;
}

table th, table td {
    border: 1px solid var(--border-color);
    padding: 0.8rem;
    text-align: left;
}

table th {
    background: var(--highlight-color);
    color: #000;
}

@media (max-width: 768px) {
    .container {
        grid-template-columns: 1fr;
    }

    .hero-section h1 {
        font-size: 2rem;
    }

    .hero-section p {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 0.9rem;
    }

    h1, h2, h3 {
        font-size: 1.5rem;
    }

    .code-block {
        font-size: 0.8rem;
    }
}