:root {
    --primary-color: #0066FF; /* 类似ManyChat/Messenger的科技蓝 */
    --primary-dark: #0052cc;
    --secondary-color: #2D3748;
    --accent-green: #00C853; /* 强调销售/WhatsApp */
    --bg-light: #F7FAFC;
    --text-main: #1A202C;
    --text-light: #718096;
    --white: #ffffff;
    --max-width: 1200px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    color: var(--text-main);
    line-height: 1.6;
    background-color: var(--white);
}

a { text-decoration: none; }
ul { list-style: none; }

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* 按钮样式 */
.btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 12px 24px;
    border-radius: 6px;
    font-weight: 600;
    transition: background 0.3s;
    display: inline-block;
}

.btn-primary:hover { background-color: var(--primary-dark); }

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    padding: 12px 24px;
    border: 1px solid var(--primary-color);
    border-radius: 6px;
    font-weight: 600;
    margin-left: 10px;
}

.btn-login {
    color: var(--text-main);
    font-weight: 600;
    margin-right: 20px;
}

/* 导航栏 */
.navbar {
    padding: 20px 0;
    position: sticky;
    top: 0;
    background-color: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    z-index: 100;
    border-bottom: 1px solid #eee;
}

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

.logo {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--text-main);
    letter-spacing: -0.5px;
}

.nav-links a {
    color: var(--text-light);
    margin-left: 20px;
    font-size: 0.95rem;
    transition: color 0.3s;
}

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

/* Hero Section */
.hero {
    padding: 80px 0;
    background: linear-gradient(180deg, #fff 0%, #f0f7ff 100%);
}

.hero-content {
    display: flex;
    align-items: center;
    gap: 50px;
}

.hero-text { flex: 1; }

.hero-text h1 {
    font-size: 3.5rem;
    line-height: 1.1;
    margin-bottom: 20px;
    color: var(--text-main);
}

.hero-text p {
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: 30px;
}

.hero-image { flex: 1; display: flex; justify-content: center; }

/* 模拟软件窗口 */
.mockup-window {
    background: var(--white);
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 500px;
    border: 1px solid #e2e8f0;
    overflow: hidden;
}

.dots {
    background: #f1f5f9;
    padding: 10px;
    display: flex;
    gap: 6px;
}

.dots span { width: 10px; height: 10px; border-radius: 50%; background: #cbd5e1; }

.screen-content {
    padding: 20px;
    background: #f8fafc;
    height: 300px;
    position: relative;
}

.chat-sim { display: flex; flex-direction: column; gap: 10px; }
.bubble { padding: 10px 15px; border-radius: 8px; font-size: 0.9rem; max-width: 80%; }
.bot { background: var(--white); align-self: flex-start; border: 1px solid #e2e8f0; }
.user { background: #dbeafe; align-self: flex-end; color: #1e40af; }
.stats-box {
    position: absolute;
    bottom: 20px;
    right: 20px;
    background: var(--accent-green);
    color: white;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}
.stats-box strong { display: block; font-size: 1.2rem; }

/* Features */
.features { padding: 80px 0; }
.section-title { text-align: center; font-size: 2rem; margin-bottom: 50px; }

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.feature-card {
    padding: 30px;
    border-radius: 12px;
    border: 1px solid #eee;
    transition: transform 0.3s;
}

.feature-card:hover { transform: translateY(-5px); border-color: var(--primary-color); }
.feature-card .icon { font-size: 2.5rem; margin-bottom: 20px; }
.feature-card h3 { margin-bottom: 15px; }
.feature-card p { color: var(--text-light); }

/* Stats */
.stats { background-color: var(--secondary-color); color: white; padding: 60px 0; }
.stats-grid { display: flex; justify-content: space-around; text-align: center; }
.stat-item strong { font-size: 3rem; color: var(--accent-green); display: block; }

/* Bottom CTA */
.bottom-cta { text-align: center; padding: 100px 0; background: var(--bg-light); }
.bottom-cta h2 { font-size: 2.5rem; margin-bottom: 15px; }
.bottom-cta p { margin-bottom: 30px; color: var(--text-light); }

/* Footer */
.footer { border-top: 1px solid #eee; padding-top: 60px; }
.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}
.footer-col h4 { margin-bottom: 20px; }
.footer-col a, .footer-col p { display: block; color: var(--text-light); margin-bottom: 10px; font-size: 0.9rem; }
.copyright { text-align: center; padding: 20px 0; border-top: 1px solid #eee; font-size: 0.85rem; color: #999; }

/* Legal Page Specifics */
.legal-content { max-width: 800px; padding: 60px 20px; }
.legal-content h1 { font-size: 2.5rem; margin-bottom: 10px; }
.legal-content h2 { margin-top: 30px; margin-bottom: 15px; color: var(--primary-dark); }
.legal-content p, .legal-content li { margin-bottom: 15px; color: #4a5568; }
.legal-content ul { padding-left: 20px; list-style: disc; }

/* Mobile Response */
@media (max-width: 768px) {
    .hero-content { flex-direction: column; text-align: center; }
    .hero-text h1 { font-size: 2.5rem; }
    .nav-links { display: none; } /* 简化处理，移动端隐藏菜单 */
    .stats-grid { flex-direction: column; gap: 30px; }
    .footer-content { grid-template-columns: 1fr; }
}