/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: #333; background: #fff; line-height: 1.6;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* ===== Layout ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== Navigation ===== */
.site-header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    background: rgba(255,255,255,0.95); backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0,0,0,0.06); height: 64px;
}
.nav-inner {
    max-width: 1200px; margin: 0 auto; padding: 0 24px;
    display: flex; align-items: center; justify-content: space-between; height: 64px;
}
.nav-logo { font-size: 22px; font-weight: 700; color: #2563EB; letter-spacing: -0.5px; }
.nav-logo span { color: #1A1A2E; }
.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a { font-size: 15px; color: #555; transition: color 0.2s; }
.nav-links a:hover, .nav-links a.active { color: #2563EB; }
.nav-right { display: flex; align-items: center; gap: 16px; }
.btn-primary {
    display: inline-block; padding: 10px 24px; border-radius: 8px;
    background: #2563EB; color: #fff !important; font-size: 14px; font-weight: 600;
    transition: background 0.2s, transform 0.1s;
}
.btn-primary:hover { background: #1d4ed8; transform: translateY(-1px); }
.btn-secondary {
    display: inline-block; padding: 10px 24px; border-radius: 8px;
    border: 1.5px solid #2563EB; color: #2563EB !important; font-size: 14px; font-weight: 600;
    transition: background 0.2s;
}
.btn-secondary:hover { background: #eff6ff; }
.btn-lg { padding: 14px 36px; font-size: 16px; border-radius: 10px; }

/* ===== Hero ===== */
.hero {
    padding: 140px 0 80px; background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #1a1a2e 100%);
    color: #fff; text-align: center; position: relative; overflow: hidden;
}
.hero::before {
    content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
    background: radial-gradient(circle at 30% 50%, rgba(37,99,235,0.15) 0%, transparent 50%),
                radial-gradient(circle at 70% 50%, rgba(59,130,246,0.1) 0%, transparent 50%);
}
.hero-content { position: relative; z-index: 1; }
.hero h1 { font-size: 48px; font-weight: 800; margin-bottom: 16px; letter-spacing: -1px; }
.hero h1 em { font-style: normal; color: #60a5fa; }
.hero .subtitle { font-size: 18px; color: rgba(255,255,255,0.75); margin-bottom: 32px; max-width: 600px; margin-left: auto; margin-right: auto; }
.hero-tags { display: flex; justify-content: center; gap: 12px; margin-bottom: 40px; flex-wrap: wrap; }
.hero-tags span {
    padding: 6px 16px; border-radius: 20px; font-size: 13px;
    background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.15); color: rgba(255,255,255,0.9);
}
.hero-actions { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
.hero .btn-secondary { border-color: rgba(255,255,255,0.4); color: #fff !important; }
.hero .btn-secondary:hover { background: rgba(255,255,255,0.1); }

/* ===== Section Common ===== */
.section { padding: 80px 0; }
.section-alt { background: #f8fafc; }
.section-title { text-align: center; margin-bottom: 48px; }
.section-title h2 { font-size: 32px; font-weight: 700; color: #1a1a2e; margin-bottom: 12px; }
.section-title p { font-size: 16px; color: #666; max-width: 560px; margin: 0 auto; }

/* ===== Highlights ===== */
.highlights-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.highlight-card {
    background: #fff; border-radius: 12px; padding: 32px 24px; text-align: center;
    border: 1px solid #e5e7eb; transition: transform 0.2s, box-shadow 0.2s;
}
.highlight-card:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(0,0,0,0.08); }
.highlight-icon { font-size: 40px; margin-bottom: 16px; }
.highlight-card h3 { font-size: 18px; font-weight: 600; margin-bottom: 8px; color: #1a1a2e; }
.highlight-card p { font-size: 14px; color: #666; line-height: 1.7; }

/* ===== Scenarios ===== */
.scenario-item {
    display: flex; align-items: center; gap: 48px; margin-bottom: 48px;
}
.scenario-item:nth-child(even) { flex-direction: row-reverse; }
.scenario-item:last-child { margin-bottom: 0; }
.scenario-visual {
    flex: 1; min-height: 220px; border-radius: 12px;
    background: linear-gradient(135deg, #eff6ff, #dbeafe); display: flex;
    align-items: center; justify-content: center; font-size: 64px;
}
.scenario-text { flex: 1; }
.scenario-text h3 { font-size: 22px; font-weight: 700; color: #1a1a2e; margin-bottom: 12px; }
.scenario-text p { font-size: 15px; color: #555; line-height: 1.8; }

/* ===== Platform ===== */
.platform-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.platform-card {
    background: #fff; border-radius: 12px; padding: 32px 16px;
    border: 1px solid #e5e7eb; transition: transform 0.2s, box-shadow 0.2s;
}
.platform-card:hover { transform: translateY(-4px); box-shadow: 0 8px 24px rgba(0,0,0,0.06); }
.platform-icon { font-size: 48px; margin-bottom: 12px; }
.platform-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 16px; color: #1a1a2e; }
.platform-card .btn-primary { padding: 8px 20px; font-size: 13px; }

/* ===== Reviews ===== */
.reviews-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: 48px; }
.review-card {
    background: #fff; border-radius: 12px; padding: 28px; border: 1px solid #e5e7eb;
}
.review-stars { color: #f59e0b; font-size: 16px; margin-bottom: 12px; }
.review-text { font-size: 14px; color: #555; line-height: 1.7; margin-bottom: 16px; }
.review-author { font-size: 13px; color: #999; }
.stats-row { display: flex; justify-content: center; gap: 64px; flex-wrap: wrap; }
.stat-item { text-align: center; }
.stat-num { font-size: 36px; font-weight: 800; color: #2563EB; }
.stat-label { font-size: 14px; color: #666; margin-top: 4px; }

/* ===== CTA ===== */
.cta-section {
    padding: 80px 0; text-align: center;
    background: linear-gradient(135deg, #1e3a5f 0%, #2563EB 100%); color: #fff;
}
.cta-section h2 { font-size: 32px; font-weight: 700; margin-bottom: 12px; }
.cta-section p { font-size: 16px; color: rgba(255,255,255,0.8); margin-bottom: 32px; }
.cta-section .btn-primary { background: #fff; color: #2563EB !important; font-weight: 700; }
.cta-section .btn-primary:hover { background: #f0f0f0; }
.cta-section .btn-secondary { border-color: rgba(255,255,255,0.5); color: #fff !important; margin-left: 12px; }

/* ===== Footer ===== */
.site-footer { background: #0f172a; color: rgba(255,255,255,0.7); padding: 60px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .nav-logo { margin-bottom: 12px; display: inline-block; }
.footer-brand p { font-size: 13px; line-height: 1.7; color: rgba(255,255,255,0.5); }
.footer-col h4 { font-size: 14px; font-weight: 600; color: #fff; margin-bottom: 16px; }
.footer-col a { display: block; font-size: 13px; color: rgba(255,255,255,0.5); margin-bottom: 10px; transition: color 0.2s; }
.footer-col a:hover { color: #60a5fa; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding-top: 24px; text-align: center; font-size: 12px; color: rgba(255,255,255,0.35); }

/* ===== Guide Page ===== */
.page-header {
    padding: 120px 0 48px; text-align: center;
    background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 100%); color: #fff;
}
.page-header h1 { font-size: 36px; font-weight: 700; margin-bottom: 12px; }
.page-header p { font-size: 16px; color: rgba(255,255,255,0.7); }
.guide-steps { max-width: 800px; margin: 0 auto; }
.guide-step {
    display: flex; gap: 24px; margin-bottom: 40px; padding-bottom: 40px;
    border-bottom: 1px solid #e5e7eb;
}
.guide-step:last-child { border-bottom: none; }
.step-num {
    flex-shrink: 0; width: 48px; height: 48px; border-radius: 50%;
    background: #2563EB; color: #fff; font-size: 20px; font-weight: 700;
    display: flex; align-items: center; justify-content: center;
}
.step-content h3 { font-size: 18px; font-weight: 600; color: #1a1a2e; margin-bottom: 8px; }
.step-content p { font-size: 15px; color: #555; line-height: 1.8; }

/* ===== FAQ Page ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { margin-bottom: 32px; background: #fff; border-radius: 12px; padding: 28px; border: 1px solid #e5e7eb; }
.faq-item h3 { font-size: 18px; font-weight: 600; color: #1a1a2e; margin-bottom: 16px; }
.faq-steps { padding-left: 0; }
.faq-steps li {
    display: flex; gap: 12px; margin-bottom: 10px; font-size: 14px; color: #555; line-height: 1.7;
}
.faq-steps li:last-child { margin-bottom: 0; }
.step-badge {
    flex-shrink: 0; width: 24px; height: 24px; border-radius: 50%;
    background: #eff6ff; color: #2563EB; font-size: 12px; font-weight: 700;
    display: flex; align-items: center; justify-content: center; margin-top: 2px;
}

/* ===== About Page ===== */
.about-content { max-width: 800px; margin: 0 auto; }
.about-block { margin-bottom: 48px; }
.about-block h2 { font-size: 24px; font-weight: 700; color: #1a1a2e; margin-bottom: 16px; }
.about-block p { font-size: 15px; color: #555; line-height: 1.8; margin-bottom: 12px; }
.about-values { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-top: 20px; }
.value-card {
    background: #f8fafc; border-radius: 10px; padding: 20px; border: 1px solid #e5e7eb;
}
.value-card h4 { font-size: 15px; font-weight: 600; color: #2563EB; margin-bottom: 6px; }
.value-card p { font-size: 13px; color: #666; margin-bottom: 0; }

/* ===== Privacy / Terms ===== */
.legal-content { max-width: 800px; margin: 0 auto; }
.legal-content h2 { font-size: 20px; font-weight: 600; color: #1a1a2e; margin: 32px 0 12px; }
.legal-content h2:first-child { margin-top: 0; }
.legal-content p { font-size: 14px; color: #555; line-height: 1.8; margin-bottom: 12px; }
.legal-content ul { padding-left: 20px; margin-bottom: 12px; }
.legal-content ul li { font-size: 14px; color: #555; line-height: 1.8; margin-bottom: 6px; list-style: disc; }

/* ===== Mobile Nav ===== */
.nav-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; color: #333; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .highlights-grid { grid-template-columns: repeat(2, 1fr); }
    .platform-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    .reviews-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-toggle { display: block; }
    .hero h1 { font-size: 32px; }
    .hero .subtitle { font-size: 15px; }
    .highlights-grid { grid-template-columns: 1fr; }
    .scenario-item, .scenario-item:nth-child(even) { flex-direction: column; gap: 24px; }
    .platform-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .stats-row { gap: 32px; }
    .section { padding: 56px 0; }
    .section-title h2 { font-size: 26px; }
    .about-values { grid-template-columns: 1fr; }
    .hero-actions { flex-direction: column; align-items: center; }
    .cta-section .btn-secondary { margin-left: 0; margin-top: 12px; }
}