:root {
    --ding-blue: #007fff;
    --dark-navy: #001529;
    --text-main: #262626;
    --text-light: #595959;
    --bg-gray: #f5f7fa;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
    margin: 0;
    line-height: 1.6;
    color: var(--text-main);
    background: #fff;
    scroll-behavior: smooth;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: #fff;
    height: 70px;
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 15px rgba(0,0,0,0.05);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo-v6 {
    font-size: 24px;
    font-weight: 800;
    color: var(--ding-blue);
    text-decoration: none;
    letter-spacing: -1px;
}

.nav-v6 {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-v6 a {
    text-decoration: none;
    color: var(--text-main);
    font-weight: 500;
    font-size: 15px;
    transition: color 0.3s;
}

.nav-v6 a:hover { color: var(--ding-blue); }

.nav-cta-v6 {
    background: var(--ding-blue);
    color: #fff !important;
    padding: 8px 20px;
    border-radius: 4px;
    font-weight: 600;
}

/* Hero Section */
.hero-v6 {
    padding: 120px 0;
    background: linear-gradient(rgba(240,247,255,0.9), rgba(255,255,255,0.95)), url('assets/hero-bg.jpg');
    background-size: cover;
    background-position: center;
    text-align: center;
}

.hero-v6 h1 {
    font-size: 42px;
    color: var(--dark-navy);
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-v6 p {
    font-size: 18px;
    color: var(--text-light);
    max-width: 700px;
    margin: 0 auto 40px;
}

.btn-group {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.btn-primary {
    background: var(--ding-blue);
    color: #fff;
    padding: 15px 35px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: bold;
    box-shadow: 0 4px 15px rgba(0,127,255,0.2);
    transition: transform 0.2s;
}

.btn-primary:hover { transform: translateY(-2px); }

.btn-outline {
    border: 1px solid var(--ding-blue);
    color: var(--ding-blue);
    padding: 15px 35px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: bold;
}

/* Features Section */
.features-v6 { padding: 80px 0; }

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

.section-title h2 { font-size: 32px; color: var(--dark-navy); }

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-item {
    padding: 40px;
    background: #fff;
    border: 1px solid #f0f0f0;
    border-radius: 12px;
    transition: all 0.3s;
}

.feature-item:hover {
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    border-color: var(--ding-blue);
}

.feature-icon {
    font-size: 40px;
    margin-bottom: 20px;
    display: block;
}

.feature-item h3 { font-size: 20px; margin-bottom: 15px; }
.feature-item p { color: var(--text-light); font-size: 15px; }

/* Analysis Section (Site7 style) */
.analysis-v6 {
    background: var(--dark-navy);
    color: #fff;
    padding: 80px 0;
    text-align: center;
}

.analysis-v6 h2 { font-size: 32px; margin-bottom: 25px; }
.analysis-v6 p { font-size: 16px; opacity: 0.8; max-width: 800px; margin: 0 auto; line-height: 1.8; }

/* FAQ Section */
.faq-v6 { padding: 80px 0; background: var(--bg-gray); }

.faq-grid {
    max-width: 800px;
    margin: 0 auto;
}

details {
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 15px;
    cursor: pointer;
}

summary { font-weight: 600; font-size: 16px; color: var(--dark-navy); }
details p { margin-top: 15px; color: var(--text-light); font-size: 14px; }

/* Footer */
footer {
    padding: 60px 0 30px;
    background: #fff;
    border-top: 1px solid #eee;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    margin-bottom: 40px;
}

.footer-brand h4 { font-size: 20px; color: var(--ding-blue); margin-bottom: 15px; }
.footer-brand p { font-size: 14px; color: var(--text-light); max-width: 300px; }

.footer-links { display: flex; gap: 60px; }
.footer-links h5 { margin-bottom: 20px; font-size: 16px; }
.footer-links ul { list-style: none; padding: 0; margin: 0; }
.footer-links li { margin-bottom: 10px; }
.footer-links a { text-decoration: none; color: var(--text-light); font-size: 14px; }
.footer-links a:hover { color: var(--ding-blue); }

.copyright {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #eee;
    font-size: 12px;
    color: #999;
}

@media (max-width: 768px) {
    .feature-grid { grid-template-columns: 1fr; }
    .hero-v6 h1 { font-size: 30px; }
    .footer-content { flex-direction: column; gap: 40px; }
    .btn-group { flex-direction: column; }
}