/* 全局样式 */
body {
    margin: 0;
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(135deg, #002f6c, #4c1d95);
    color: #ffffff;
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3 {
    color: #ff8c00;
    text-align: center;
}

a {
    color: #ff8c00;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(0, 47, 108, 0.8);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    z-index: 1000;
}

.navbar .logo {
    font-size: 24px;
    font-weight: bold;
    color: #ff8c00;
}

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

.navbar .menu a {
    color: #fff;
    font-size: 16px;
}

.navbar .menu a:hover {
    color: #ff9f43;
    transform: scale(1.1);
    transition: all 0.3s ease;
}

/* 主视觉区 */
.hero {
    height: 100vh;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center center/cover;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: #fff;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1;
}

.hero h1 {
    position: relative;
    z-index: 2;
    font-size: 48px;
}

.hero p {
    position: relative;
    z-index: 2;
    font-size: 20px;
}

/* 卡片布局 */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 100px;
}

.card {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.card img {
    width: 100px;
    height: 100px;
    object-fit: cover;
    border-radius: 50%;
    margin-bottom: 10px;
}

.card h3 {
    color: #ff8c00;
}

/* 示例文章 */
.article {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    padding: 20px;
    margin-top: 40px;
}

.article h2 {
    color: #ff8c00;
}

.article pre {
    background: rgba(0, 0, 0, 0.5);
    padding: 10px;
    border-radius: 5px;
    overflow: auto;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar .menu {
        flex-direction: column;
        gap: 10px;
    }

    .hero h1 {
        font-size: 36px;
    }

    .hero p {
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .cards {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        font-size: 28px;
    }

    .hero p {
        font-size: 14px;
    }
}

/* 暗黑模式 */
.dark-mode body {
    background: #121212;
    color: #fff;
}

.dark-mode .navbar {
    background: rgba(0, 0, 0, 0.8);
}

.dark-mode .card {
    background: rgba(255, 255, 255, 0.05);
}

/* 微交互 */
button {
    background: #ff8c00;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
}

button:hover {
    background: #ff9f43;
    transform: scale(1.1);
}

/* 提示信息 */
.tip {
    text-align: center;
    margin: 20px 0;
    font-size: 18px;
    color: #ff8c00;
}