/* 基础样式 */
body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    background: radial-gradient(circle, rgba(26, 41, 75, 1) 0%, rgba(60, 15, 122, 1) 100%);
    color: #ffffff;
}

a {
    color: #00d1ff;
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #ff5722;
}

header {
    background: linear-gradient(135deg, rgba(26, 41, 75, 0.9), rgba(60, 15, 122, 0.9));
    padding: 20px 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}

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

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    font-size: 1.8em;
    font-weight: bold;
    color: #ffffff;
}

.navbar-menu {
    display: flex;
    gap: 20px;
}

.navbar-menu a {
    font-size: 1em;
    color: #ffffff;
    position: relative;
}

.navbar-menu a::after {
    content: '';
    display: block;
    width: 0%;
    height: 2px;
    background: #00d1ff;
    transition: width 0.3s;
    position: absolute;
    bottom: -5px;
    left: 0;
}

.navbar-menu a:hover::after {
    width: 100%;
}

.hero {
    height: 100vh;
    background: radial-gradient(circle, rgba(255, 87, 34, 0.7), transparent), url('https://images.gptkong.com/demo/sample1.png') center/cover no-repeat;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    text-align: center;
    animation: aurora-move 15s linear infinite;
}

@keyframes aurora-move {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.hero h1 {
    font-size: 3em;
    margin-bottom: 20px;
    background: linear-gradient(90deg, #00d1ff, #00ffcc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.2em;
    max-width: 600px;
}

.cta-button {
    margin-top: 30px;
    padding: 15px 30px;
    background: linear-gradient(90deg, #ff5722, #ff9800);
    border: none;
    border-radius: 50px;
    color: #ffffff;
    font-size: 1em;
    cursor: pointer;
    transition: transform 0.3s, background 0.3s;
}

.cta-button:hover {
    transform: scale(1.05);
    background: linear-gradient(90deg, #ff9800, #ff5722);
}

.features {
    padding: 100px 0;
    background: linear-gradient(135deg, rgba(60, 15, 122, 0.8), rgba(26, 41, 75, 0.8));
}

.features h2 {
    text-align: center;
    margin-bottom: 50px;
    font-size: 2.5em;
    color: #ffffff;
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.grid-item {
    background: rgba(255, 255, 255, 0.1);
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    transition: transform 0.3s, background 0.3s;
}

.grid-item:hover {
    transform: translateY(-10px);
    background: rgba(255, 255, 255, 0.2);
}

.grid-item img {
    width: 80px;
    height: 80px;
    margin-bottom: 20px;
}

.grid-item h3 {
    margin-bottom: 15px;
    font-size: 1.5em;
}

.grid-item p {
    font-size: 1em;
    color: #e0e0e0;
}

.data-visualization {
    padding: 100px 0;
    background: linear-gradient(135deg, rgba(26, 41, 75, 0.9), rgba(60, 15, 122, 0.9));
}

.data-visualization h2 {
    text-align: center;
    margin-bottom: 50px;
    font-size: 2.5em;
    color: #ffffff;
}

.charts {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    justify-content: center;
}

.chart {
    background: rgba(255, 255, 255, 0.1);
    padding: 20px;
    border-radius: 10px;
    width: 300px;
    text-align: center;
}

.chart img {
    width: 100%;
    height: auto;
    border-radius: 5px;
}

.chart h3 {
    margin-top: 15px;
    font-size: 1.5em;
    color: #ffffff;
}

.chart p {
    font-size: 1em;
    color: #e0e0e0;
}

.article-section {
    padding: 100px 0;
    background: linear-gradient(135deg, rgba(60, 15, 122, 0.8), rgba(26, 41, 75, 0.8));
}

.article-section h2 {
    text-align: center;
    margin-bottom: 50px;
    font-size: 2.5em;
    color: #ffffff;
}

.article-content {
    max-width: 800px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.1);
    padding: 30px;
    border-radius: 10px;
    color: #ffffff;
    line-height: 1.8;
}

.article-content h3 {
    margin-top: 30px;
    font-size: 1.8em;
    color: #00d1ff;
}

.article-content pre {
    background: rgba(0, 0, 0, 0.7);
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
}

.article-content code {
    color: #00ffcc;
    font-family: 'Courier New', Courier, monospace;
}

.article-content ul {
    list-style-type: disc;
    padding-left: 20px;
}

.article-content li {
    margin-bottom: 10px;
}

.sample-display {
    padding: 50px 0;
    background: linear-gradient(135deg, rgba(26, 41, 75, 0.9), rgba(60, 15, 122, 0.9));
    text-align: center;
    color: #ffffff;
}

.sample-display h2 {
    margin-bottom: 20px;
    font-size: 2em;
}

.sample-display p {
    font-size: 1.2em;
}

.footer {
    padding: 50px 0;
    background: linear-gradient(135deg, rgba(60, 15, 122, 0.9), rgba(26, 41, 75, 0.9));
    color: #ffffff;
    text-align: center;
}

.footer p {
    margin: 10px 0;
}

.footer a {
    color: #00d1ff;
}

@media (max-width: 768px) {
    .navbar-menu {
        flex-direction: column;
        gap: 10px;
    }

    .hero h1 {
        font-size: 2.5em;
    }

    .cta-button {
        padding: 10px 20px;
        font-size: 0.9em;
    }

    .features h2, .data-visualization h2, .article-section h2 {
        font-size: 2em;
    }

    .grid-item h3, .chart h3 {
        font-size: 1.3em;
    }
}

@media (max-width: 480px) {
    .navbar {
        padding: 10px 0;
    }

    .navbar-brand {
        font-size: 1.5em;
    }

    .features h2, .data-visualization h2, .article-section h2 {
        font-size: 1.8em;
    }

    .grid-container {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }

    .chart {
        width: 100%;
    }
}

@media (min-width: 1440px) {
    .features, .data-visualization, .article-section {
        padding: 150px 0;
    }

    .hero h1 {
        font-size: 4em;
    }

    .cta-button {
        padding: 20px 40px;
        font-size: 1.2em;
    }
}

/* 提示信息样式 */
.reference-note {
    position: fixed;
    bottom: 10px;
    right: 10px;
    background: rgba(0, 0, 0, 0.6);
    color: #ffffff;
    padding: 10px 20px;
    border-radius: 20px;
    font-size: 0.9em;
    z-index: 1000;
}

@media (max-width: 480px) {
    .reference-note {
        font-size: 0.8em;
        padding: 8px 16px;
    }
}