/* Base styles */
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft Yahei", "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;
    color: #101828;
    background: #ffffff;
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 1080px;
    padding: 0 20px;
    margin: 0 auto;
}

/* Header */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid #eef2f7;
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}
.logo {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    color: #0f172a;
    text-decoration: none;
    font-size: 20px;
}
.logo-mark { width: 22px; height: 22px; border-radius: 4px; }
.top-nav { display: flex; gap: 12px; }
.nav-btn {
    display: inline-flex;
    align-items: center;
    height: 36px;
    padding: 0 14px;
    border-radius: 8px;
    text-decoration: none;
    color: #0f172a;
    background: #f3f4f6;
    border: 1px solid transparent;
    transition: background 0.2s, border-color 0.2s, color 0.2s;
}
.nav-btn:hover { background: #e5e7eb; }
.nav-btn.outline {
    background: transparent;
    border-color: #e5e7eb;
}
.nav-btn.outline:hover {
    background: #f8fafc;
}

/* Hero */
.hero {
    padding: 72px 0 48px;
    background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
}
.hero h1 { margin: 0 0 12px; font-size: 40px; }
.subtitle { color: #475569; margin-bottom: 20px; }
.cta-group { display: flex; gap: 12px; margin: 24px 0 32px; }
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 44px;
    padding: 0 18px;
    border-radius: 10px;
    text-decoration: none;
    background: #e5e7eb;
    color: #0f172a;
}
.btn.primary { background: #2563eb; color: #ffffff; }
.btn:hover { filter: brightness(0.98); }

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}
.card {
    padding: 16px;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    background: #ffffff;
}

/* Contact */
.contact { padding: 32px 0 64px; }
.contact h2 { margin-top: 0; }
.contact-list { margin: 8px 0 0; padding-left: 18px; }
.contact-list a { color: #2563eb; text-decoration: none; }
.contact-list a:hover { text-decoration: underline; }

/* Policy */
.policy { padding: 48px 0 64px; }
.policy h1 { margin-top: 0; }
.policy h2 { margin-top: 28px; }

/* Footer */
.site-footer { border-top: 1px solid #eef2f7; padding: 16px 0; color: #475569; }

/* Responsive */
@media (max-width: 900px) {
    .feature-grid { grid-template-columns: 1fr; }
    .hero h1 { font-size: 32px; }
}