:root {
    --primary: #E6F7FF;
    --secondary: #F5F5F5;
    --accent: #4DA6FF;
    --text: #333333;
    --light-text: #666666;
    --border: #E0E0E0;
    --dark-blue: #2563EB;
    --success: #10B981;
    --warning: #F59E0B;
}

body {
    font-family: 'Inter', sans-serif;
    margin: 0;
    padding: 0;
    color: var(--text);
    background-color: white;
    line-height: 1.6;
}

/* 头部样式 */
header {
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    position: fixed;
    width: 100%;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

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

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo {
    font-size: 24px;
    font-weight: 600;
    color: var(--text);
    display: flex;
    align-items: center;
}

.logo span {
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

.nav-links a:hover {
    color: var(--accent);
}

.nav-links a.active:after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: var(--accent);
}

.auth-links {
    display: flex;
    gap: 15px;
    align-items: center;
}

.login-btn {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.login-btn:hover {
    color: var(--accent);
}

.register-btn {
    background-color: var(--accent);
    color: white;
    padding: 8px 20px;
    border-radius: 20px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
}

.register-btn:hover {
    background-color: #3a8de6;
    transform: translateY(-1px);
    box-shadow: 0 4px 10px rgba(58, 141, 230, 0.3);
}

/* 主体内容 */
.hero {
    padding: 180px 0 80px;
    background: linear-gradient(135deg, var(--primary) 0%, white 100%);
    text-align: center;
}

.hero h1 {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--dark-blue);
}

.hero p {
    font-size: 18px;
    color: var(--light-text);
    max-width: 700px;
    margin: 0 auto 40px;
}

.cta-button {
    background-color: var(--accent);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 30px;
    font-weight: 500;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(77, 166, 255, 0.3);
    text-decoration: none;
    display: inline-block;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(77, 166, 255, 0.4);
    background-color: var(--dark-blue);
}

/* 解决方案区块 */
.solution-section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 32px;
    color: var(--dark-blue);
    margin-bottom: 15px;
}

.section-title p {
    color: var(--light-text);
    max-width: 700px;
    margin: 0 auto;
}

.solution-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.solution-card {
    background: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 5px 25px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--border);
    transition: all 0.3s;
}

.solution-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(77, 166, 255, 0.1);
    border-color: var(--accent);
}

.solution-card .icon {
    width: 60px;
    height: 60px;
    background-color: rgba(77, 166, 255, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.solution-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: var(--dark-blue);
}

.solution-card p {
    color: var(--light-text);
    margin-bottom: 20px;
}

.solution-card .features {
    margin: 25px 0;
}

.solution-card .feature-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 12px;
}

.solution-card .feature-item:before {
    content: '✓';
    color: var(--success);
    margin-right: 10px;
    font-weight: bold;
}

/* 市场数据区块 */
.data-section {
    background-color: var(--secondary);
    padding: 80px 0;
}

.data-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.data-card {
    background: white;
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.03);
}

.data-card .number {
    font-size: 42px;
    font-weight: 700;
    color: var(--accent);
    margin: 15px 0;
}

.data-card .label {
    color: var(--light-text);
    font-size: 14px;
}

/* 尾部样式 */
footer {
    background-color: var(--text);
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-column h3 {
    font-size: 18px;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer-column h3:after {
    content: '';
    position: absolute;
    width: 40px;
    height: 2px;
    background-color: var(--accent);
    bottom: 0;
    left: 0;
}

.footer-column ul {
    list-style: none;
    padding: 0;
}

.footer-column ul li {
    margin-bottom: 10px;
}

.footer-column ul li a {
    color: #ccc;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-column ul li a:hover {
    color: white;
}

.copyright {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #aaa;
    font-size: 14px;
}

@media (max-width: 768px) {
    .hero {
        padding: 150px 0 60px;
    }

    .hero h1 {
        font-size: 32px;
    }

    .nav-links {
        gap: 15px;
    }

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