* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

:root {
    --primary: #3498db;
    --secondary: #2c3e50;
    --accent: #e74c3c;
    --light: #ecf0f1;
    --dark: #34495e;
    --success: #2ecc71;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

body {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    color: #333;
    line-height: 1.6;
    min-height: 100vh;
}

header {
    background: linear-gradient(120deg, var(--secondary), var(--primary));
    color: white;
    text-align: center;
    padding: 40px 20px;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

header::before {
    content: "";
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0) 70%);
    transform: rotate(30deg);
}

.logo {
    font-size: 2.8rem;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.logo i {
    color: var(--accent);
    background: white;
    border-radius: 50%;
    padding: 15px;
    box-shadow: var(--shadow);
}

.logo-icon {
    width: 50px;
    height: auto;
    margin-right: 10px;
    font-size: 2rem;
    color: var(--primary);
}


header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 700px;
    margin: 0 auto 20px;
}

.container {
    display: flex;
    max-width: 1400px;
    margin: 40px auto;
    padding: 0 20px;
    gap: 30px;
}

.sidebar {
    flex: 0 0 280px;
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 25px;
    height: fit-content;
    position: sticky;
    top: 30px;
}

.sidebar h2 {
    color: var(--primary);
    padding-bottom: 15px;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--light);
}

.nav-links {
    list-style: none;
}

.nav-links li {
    margin-bottom: 12px;
}

.nav-links a {
    display: block;
    padding: 12px 15px;
    border-radius: 8px;
    color: var(--dark);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-links a:hover, .nav-links a.active {
    background: linear-gradient(to right, var(--primary), #4da7db);
    color: white;
    transform: translateX(5px);
}

.nav-links i {
    width: 24px;
    text-align: center;
}

.content {
    flex: 1;
}

.section {
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 35px;
    margin-bottom: 30px;
    transition: var(--transition);
}

.section:hover {
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    transform: translateY(-3px);
}

.section h2 {
    color: var(--primary);
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--light);
    display: flex;
    align-items: center;
    gap: 12px;
}

.section h2 i {
    background: var(--light);
    width: 45px;
    height: 45px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin: 25px 0;
}

.feature-card {
    background: var(--light);
    border-radius: 10px;
    padding: 25px;
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    background: linear-gradient(135deg, var(--primary), #67b0e4);
    color: white;
}

.feature-card i {
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: var(--primary);
}

.feature-card:hover i {
    color: white;
}

.feature-card h3 {
    margin-bottom: 12px;
    font-size: 1.3rem;
}

.step {
    display: flex;
    margin-bottom: 30px;
    padding-bottom: 30px;
    border-bottom: 1px dashed #ddd;
    align-items: flex-start;
    gap: 20px;
}

.step:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.step-number {
    background: var(--primary);
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.step-content h3 {
    margin-bottom: 10px;
    color: var(--secondary);
}

.faq-item {
    margin-bottom: 25px;
    background: var(--light);
    border-radius: 10px;
    overflow: hidden;
}

.faq-question {
    background: var(--secondary);
    color: white;
    padding: 18px 25px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-answer {
    padding: 20px 25px;
    display: none;
}

.faq-item.active .faq-answer {
    display: block;
}

.highlight {
    background: #fff9db;
    border-left: 4px solid #ffd43b;
    padding: 12px 20px;
    margin: 15px 0;
    border-radius: 0 8px 8px 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.contact-card {
    text-align: center;
    padding: 25px;
    border-radius: 10px;
    background: var(--light);
    transition: var(--transition);
}

.contact-card:hover {
    background: var(--primary);
    color: white;
}

.contact-card i {
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: var(--primary);
}

.contact-card:hover i {
    color: white;
}

/* 页脚 */
footer {
    background: var(--dark);
    color: white;
    padding: 4rem 5% 2rem;
    margin-top: auto;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-title {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--accent);
}

.contact-info {
    margin-top: 1rem;
}

.contact-item {
    display: flex;
    align-items: center;
    margin-bottom: 0.8rem;
}

.contact-icon {
    margin-right: 15px;
    font-size: 1.2rem;
    color: var(--accent);
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 45px;
    height: 45px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: white;
    font-size: 1.2rem;
    transition: all 0.3s;
    text-decoration: none;
}

.social-icon:hover {
    background: var(--primary);
    transform: translateY(-5px);
}

.copyright {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.7);
}

@media (max-width: 992px) {
    .container {
        flex-direction: column;
    }

    .sidebar {
        position: relative;
        width: 100%;
    }

    .qrcode {
        display: none;
    }
}

@media (max-width: 768px) {
    header {
        padding: 30px 15px;
    }

    .logo {
        font-size: 2.2rem;
    }

    header h1 {
        font-size: 2rem;
    }

    .section {
        padding: 25px 20px;
    }

    .qrcode {
        display: none;
    }
}