* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #2563EB;
    --primary-dark: #1D4ED8;
    --primary-light: #DBEAFE;
    --primary-bg: #EFF6FF;
    --gray-50: #F8FAFC;
    --gray-100: #F1F5F9;
    --gray-200: #E2E8F0;
    --gray-300: #CBD5E1;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1E293B;
    --gray-900: #0F172A;
    --radius: 12px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 12px 40px rgba(37, 99, 235, 0.10);
    --transition: all 0.25s ease;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

html { scroll-behavior: smooth; }
body {
    font-family: var(--font);
    color: var(--gray-800);
    background: #FFFFFF;
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

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

.btn-primary {
    display: inline-block;
    background: var(--primary);
    color: #fff !important;
    font-weight: 600;
    padding: 10px 22px;
    border-radius: 60px;
    border: none;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
    text-decoration: none !important;
    text-align: center;
    line-height: 1.5;
    white-space: nowrap;
    max-width: 100%;
    box-sizing: border-box;
    margin: 0;
    vertical-align: middle;
}
.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.30);
    color: #fff !important;
}

.badge-safe {
    display: inline-block;
    background: #DCFCE7;
    color: #166534;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 3px 12px;
    border-radius: 40px;
}

/* ===== 导航栏 ===== */
.navbar {
    background: rgba(255, 255, 255, 0.90);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 0 24px;
    height: 72px;
    display: flex;
    align-items: center;
}
.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 0;
}
.logo {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--gray-900);
    letter-spacing: -0.3px;
}
.logo span { color: var(--primary); }
.nav-links {
    display: flex;
    gap: 32px;
    align-items: center;
}
.nav-links a {
    font-weight: 500;
    color: var(--gray-600);
    transition: var(--transition);
    font-size: 0.95rem;
    padding: 6px 0;
    border-bottom: 2px solid transparent;
}
.nav-links a:hover {
    color: var(--gray-900);
}
.nav-links a.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}



/* ===== 页脚 ===== */
.footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: 48px 0 32px 0;
    border-top: 1px solid var(--gray-800);
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
}
.footer h4 {
    color: #fff;
    font-weight: 600;
    margin-bottom: 16px;
    font-size: 1rem;
}
.footer a {
    display: block;
    padding: 4px 15px;
    color: var(--gray-400);
    transition: var(--transition);
}
.footer a:hover { color: #fff; }
.footer .copyright {
    border-top: 1px solid var(--gray-800);
    padding-top: 24px;
    margin-top: 32px;
    text-align: center;
    font-size: 0.9rem;
}