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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f5f7fa;
}

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

/* 导航栏 */
.navbar {
    background: linear-gradient(135deg, #1a73e8, #0d47a1);
    color: #fff;
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.logo {
    font-size: 1.8em;
    font-weight: bold;
    color: #fff;
    text-decoration: none;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 20px;
}

.nav-links a {
    color: #fff;
    text-decoration: none;
    padding: 8px 15px;
    border-radius: 20px;
    transition: background 0.3s;
}

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

.hamburger {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 1.5em;
    cursor: pointer;
}

/* 主视觉 */
.hero {
    background: linear-gradient(135deg, #1a73e8, #4fc3f7);
    color: #fff;
    text-align: center;
    padding: 100px 20px;
}

.hero h1 {
    font-size: 2.5em;
    margin-bottom: 20px;
}

.hero p {
    font-size: 1.2em;
    margin-bottom: 30px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.btn-primary {
    display: inline-block;
    padding: 15px 40px;
    background: #fff;
    color: #1a73e8;
    border-radius: 30px;
    text-decoration: none;
    font-weight: bold;
    font-size: 1.1em;
    transition: transform 0.3s, box-shadow 0.3s;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

/* 通用区块 */
.section {
    padding: 60px 20px;
}

.section h2 {
    text-align: center;
    font-size: 2em;
    margin-bottom: 20px;
    color: #1a73e8;
}

.section p {
    text-align: center;
    margin-bottom: 30px;
    color: #666;
}

.bg-light {
    background: #fff;
}

/* 卡片网格 */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.card {
    background: #fff;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
    text-align: center;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.15);
}

.card h3 {
    color: #1a73e8;
    margin-bottom: 15px;
}

.btn-secondary {
    display: inline-block;
    padding: 10px 25px;
    background: #1a73e8;
    color: #fff;
    border-radius: 20px;
    text-decoration: none;
    margin-top: 15px;
    transition: background 0.3s;
}

.btn-secondary:hover {
    background: #0d47a1;
}

.btn-link {
    display: inline-block;
    color: #1a73e8;
    text-decoration: none;
    font-weight: bold;
    margin-top: 20px;
    transition: color 0.3s;
}

.btn-link:hover {
    color: #0d47a1;
}

/* 二维码 */
.qrcode-wrapper {
    text-align: center;
    padding: 30px;
}

.qrcode-wrapper img {
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

/* 系统要求列表 */
.system-requirements {
    list-style: none;
    padding: 0;
    max-width: 600px;
    margin: 0 auto;
}

.system-requirements li {
    background: #fff;
    padding: 20px;
    margin-bottom: 10px;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.system-requirements li strong {
    color: #1a73e8;
}

/* 安装教程 */
.guide-steps {
    list-style: none;
    padding: 0;
    max-width: 600px;
    margin: 0 auto;
}

.guide-steps li {
    background: #fff;
    padding: 20px;
    margin-bottom: 10px;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.guide-steps li strong {
    color: #1a73e8;
}

/* 常见问题 */
.faq-item {
    background: #fff;
    padding: 20px;
    margin-bottom: 10px;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.faq-item h4 {
    color: #1a73e8;
    margin-bottom: 10px;
}

/* 页脚 */
.footer {
    background: #333;
    color: #fff;
    text-align: center;
    padding: 30px 20px;
}

.footer a {
    color: #4fc3f7;
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* 管理后台 */
.admin-container {
    max-width: 600px;
    margin: 50px auto;
    padding: 20px;
}

.admin-login, .admin-panel {
    background: #fff;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.admin-login h1, .admin-panel h1 {
    text-align: center;
    color: #1a73e8;
    margin-bottom: 30px;
}

.admin-login form, .admin-panel form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.admin-login input, .admin-panel input, .admin-panel textarea {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1em;
}

.admin-login button, .admin-panel button {
    padding: 15px;
    background: #1a73e8;
    color: #fff;
    border: none;
    border-radius: 5px;
    font-size: 1.1em;
    cursor: pointer;
    transition: background 0.3s;
}

.admin-login button:hover, .admin-panel button:hover {
    background: #0d47a1;
}

.error { color: #dc3545; text-align: center; }
.success { color: #28a745; text-align: center; }

/* 响应式 */
@media (max-width: 768px) {
    .hamburger {
        display: block;
    }

    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background: #0d47a1;
        padding: 20px;
    }

    .nav-links.active {
        display: flex;
    }

    .hero h1 {
        font-size: 1.8em;
    }

    .hero p {
        font-size: 1em;
    }

    .grid {
        grid-template-columns: 1fr;
    }
}