/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif; color: #333; line-height: 1.6; background: #fff; }

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

/* ── Header ── */
header { background: #fff; border-bottom: 1px solid #eee; position: sticky; top: 0; z-index: 100; }
.nav { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.logo { font-size: 22px; font-weight: 700; color: #1a73e8; text-decoration: none; letter-spacing: 1px; }
nav a { color: #555; text-decoration: none; margin-left: 28px; font-size: 15px; transition: color .2s; }
nav a:hover { color: #1a73e8; }
nav a.active { color: #1a73e8; font-weight: 600; }

/* ── Hero ── */
.hero { background: linear-gradient(135deg, #1a73e8 0%, #1557b0 100%); color: #fff; text-align: center; padding: 100px 20px 80px; }
.hero h1 { font-size: 38px; font-weight: 700; margin-bottom: 16px; }
.hero p { font-size: 18px; max-width: 680px; margin: 0 auto 32px; opacity: .9; line-height: 1.7; }
.btn { display: inline-block; background: #fff; color: #1a73e8; padding: 12px 36px; border-radius: 6px; text-decoration: none; font-weight: 600; font-size: 16px; transition: box-shadow .2s; }
.btn:hover { box-shadow: 0 4px 16px rgba(0,0,0,.15); }

/* ── Sections ── */
.section { padding: 64px 20px; }
.section h2 { font-size: 28px; text-align: center; margin-bottom: 40px; color: #222; }
.bg-light { background: #f8f9fa; }

/* ── Page Header ── */
.page-header { background: linear-gradient(135deg, #1a73e8 0%, #1557b0 100%); color: #fff; text-align: center; padding: 56px 20px; }
.page-header h1 { font-size: 32px; font-weight: 700; }

/* ── Grids ── */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

/* ── Cards ── */
.card { background: #fff; border-radius: 8px; padding: 28px 24px; box-shadow: 0 2px 12px rgba(0,0,0,.06); transition: transform .2s, box-shadow .2s; }
.card:hover { transform: translateY(-2px); box-shadow: 0 4px 20px rgba(0,0,0,.1); }
.card h3 { font-size: 18px; color: #1a73e8; margin-bottom: 12px; }
.card p { font-size: 14px; color: #666; line-height: 1.7; }
.card-step { text-align: center; }
.card-step h3 { font-size: 17px; }

/* ── Service List ── */
.service-list { max-width: 800px; margin: 0 auto; }
.service-item { margin-bottom: 36px; }
.service-item h3 { font-size: 20px; color: #1a73e8; margin-bottom: 8px; }
.service-item p { font-size: 15px; color: #555; line-height: 1.7; }

/* ── Contact ── */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; max-width: 800px; margin: 0 auto; }
.contact-info h2 { text-align: left; margin-bottom: 20px; }
.contact-info > p { color: #666; margin-bottom: 24px; }
.contact-item { margin-bottom: 20px; }
.contact-item strong { display: block; color: #333; margin-bottom: 4px; font-size: 15px; }
.contact-item p { color: #666; font-size: 14px; }
.contact-details { background: #f8f9fa; border-radius: 8px; padding: 32px; align-self: start; }
.contact-details h3 { font-size: 18px; color: #1a73e8; margin-bottom: 16px; }
.contact-details p { margin-bottom: 12px; font-size: 15px; color: #555; }

/* ── Footer ── */
footer { background: #222; color: #999; padding: 40px 20px; }
.footer-content { display: flex; justify-content: space-between; align-items: center; }
.footer-content p { margin-bottom: 4px; font-size: 13px; }
.footer-content a { color: #aaa; text-decoration: none; font-size: 13px; transition: color .2s; }
.footer-content a:hover { color: #fff; }

/* ── Responsive ── */
@media (max-width: 768px) {
    .hero h1 { font-size: 28px; }
    .hero p { font-size: 16px; }
    .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-content { flex-direction: column; text-align: center; gap: 12px; }
}
@media (max-width: 480px) {
    .nav { flex-direction: column; height: auto; padding: 12px 0; }
    nav a { margin: 0 10px; font-size: 14px; }
    .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .hero { padding: 60px 20px 50px; }
    .section { padding: 40px 20px; }
}