:root {
    --blue-50: #f2f7ff;
    --blue-100: #e1eeff;
    --blue-200: #c3ddfd;
    --blue-300: #95c5f9;
    --blue-400: #68acf5;
    --blue-500: #4d94f2;
    --blue-550: #3d83e0;
    --gray-50: #fafbfc;
    --gray-100: #f5f6f8;
    --gray-200: #e9ecf0;
    --gray-400: #a3aab5;
    --gray-500: #7b828c;
    --gray-600: #5c626b;
    --gray-800: #24272c;
    --gray-900: #141619;
    --white: #ffffff;
    --radius: 10px;
    --radius-lg: 16px;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
    font-family: var(--font-sans);
    background: var(--white);
    color: var(--gray-800);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 导航栏 */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    height: 56px; background: rgba(255,255,255,0.9);
    backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-100);
}
.navbar-inner {
    max-width: 960px; margin: 0 auto; padding: 0 20px;
    display: flex; align-items: center; justify-content: space-between; height: 100%;
}
.nav-brand {
    display: flex; align-items: center; gap: 8px; text-decoration: none;
    color: var(--gray-900); font-weight: 650; font-size: 1rem; letter-spacing: -0.01em;
}
.nav-brand-icon {
    width: 28px; height: 28px; background: var(--blue-500);
    border-radius: 6px; display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.nav-brand-icon svg { width: 15px; height: 15px; fill: #fff; }
.nav-links { display: flex; align-items: center; gap: 2px; list-style: none; }
.nav-links a {
    text-decoration: none; color: var(--gray-600); padding: 6px 12px;
    border-radius: 6px; font-size: 0.82rem; font-weight: 500; transition: all 0.18s;
}
.nav-links a:hover { color: var(--blue-500); background: var(--blue-50); }
.nav-btn {
    background: var(--blue-500) !important; color: #fff !important;
    font-weight: 600 !important; border-radius: 16px !important; padding: 7px 16px !important;
}
.nav-btn:hover { background: var(--blue-550) !important; color: #fff !important; }

/* Hero */
.hero { padding: 120px 20px 60px; text-align: center; max-width: 600px; margin: 0 auto; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 5px;
    background: var(--blue-50); color: var(--blue-500);
    padding: 5px 14px; border-radius: 16px; font-size: 0.78rem; font-weight: 600; margin-bottom: 16px;
}
.hero-badge-dot { width: 5px; height: 5px; border-radius: 50%; background: var(--blue-500); }
.hero h1 { font-size: 2rem; font-weight: 700; letter-spacing: -0.03em; margin-bottom: 10px; color: var(--gray-900); }
.hero h1 .hl { color: var(--blue-500); }
.hero-desc { font-size: 0.92rem; color: var(--gray-500); margin-bottom: 24px; line-height: 1.7; }
.hero-actions { display: flex; align-items: center; justify-content: center; gap: 10px; flex-wrap: wrap; }
.btn {
    display: inline-flex; align-items: center; gap: 6px; padding: 10px 22px;
    border-radius: 20px; font-size: 0.85rem; font-weight: 600; text-decoration: none;
    cursor: pointer; border: none; transition: all 0.25s; font-family: inherit;
}
.btn-primary { background: var(--blue-500); color: #fff; }
.btn-primary:hover { background: var(--blue-550); transform: translateY(-1px); box-shadow: 0 4px 14px rgba(77,148,242,0.25); }
.btn-outline { background: #fff; color: var(--blue-500); border: 1.5px solid var(--gray-200); }
.btn-outline:hover { border-color: var(--blue-300); background: var(--blue-50); }
.btn svg { width: 16px; height: 16px; flex-shrink: 0; }

/* 通用区块 */
.section { padding: 60px 20px; max-width: 900px; margin: 0 auto; }
.section-title { text-align: center; font-size: 1.4rem; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 8px; color: var(--gray-900); }
.section-subtitle { text-align: center; font-size: 0.85rem; color: var(--gray-500); margin-bottom: 36px; }

/* 功能卡片 */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.feature-card {
    background: #fff; border-radius: var(--radius); padding: 24px 18px;
    border: 1px solid var(--gray-200); text-align: center; transition: all 0.25s;
}
.feature-card:hover { border-color: var(--blue-200); box-shadow: 0 2px 10px rgba(77,148,242,0.06); }
.feature-icon {
    width: 38px; height: 38px; border-radius: 10px; background: var(--blue-50);
    color: var(--blue-500); display: flex; align-items: center; justify-content: center; margin: 0 auto 12px;
}
.feature-icon svg { width: 18px; height: 18px; }
.feature-card h3 { font-size: 0.88rem; font-weight: 650; margin-bottom: 4px; color: var(--gray-800); }
.feature-card p { font-size: 0.78rem; color: var(--gray-500); line-height: 1.5; }

/* 步骤 */
.steps-section {
    background: var(--gray-50); padding: 50px 20px;
    border-top: 1px solid var(--gray-200); border-bottom: 1px solid var(--gray-200);
}
.steps-inner { max-width: 700px; margin: 0 auto; }
.steps-row { display: flex; align-items: center; justify-content: center; gap: 0; text-align: center; flex-wrap: wrap; }
.step-item { flex: 1; min-width: 120px; padding: 16px 10px; }
.step-num {
    width: 32px; height: 32px; border-radius: 50%; background: var(--blue-500);
    color: #fff; display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 0.85rem; margin: 0 auto 8px;
}
.step-item h4 { font-size: 0.85rem; font-weight: 650; color: var(--gray-800); margin-bottom: 2px; }
.step-item p { font-size: 0.75rem; color: var(--gray-500); }
.step-arrow { color: var(--gray-300); font-size: 1.2rem; flex-shrink: 0; padding: 0 4px; display: flex; align-items: center; }

/* 统计 */
.stats-row { display: flex; flex-wrap: wrap; justify-content: center; gap: 32px; text-align: center; padding: 10px 0; }
.stat-item h2 { font-size: 1.6rem; font-weight: 700; color: var(--blue-500); letter-spacing: -0.02em; }
.stat-item p { font-size: 0.75rem; color: var(--gray-500); margin-top: 2px; }

/* CTA */
.cta-section { padding: 40px 20px 60px; text-align: center; }
.cta-box {
    max-width: 420px; margin: 0 auto; background: var(--blue-500);
    border-radius: var(--radius-lg); padding: 40px 28px; color: #fff; text-align: center;
}
.cta-box h2 { font-size: 1.3rem; font-weight: 700; margin-bottom: 6px; }
.cta-box p { font-size: 0.85rem; opacity: 0.9; margin-bottom: 22px; }
.qr-card {
    display: inline-block; background: #fff; border-radius: 14px;
    padding: 14px; box-shadow: 0 6px 20px rgba(0,0,0,0.10); margin-bottom: 18px;
}
.qr-card img { display: block; width: 140px; height: 140px; border-radius: 8px; object-fit: contain; background: #fff; }
.btn-white {
    background: #fff; color: var(--blue-500); font-weight: 700;
    padding: 10px 24px; border-radius: 20px; text-decoration: none;
    display: inline-flex; align-items: center; gap: 5px; font-size: 0.85rem;
    transition: all 0.25s; border: none; cursor: pointer;
}
.btn-white:hover { transform: translateY(-1px); box-shadow: 0 4px 14px rgba(0,0,0,0.12); }
.cta-sub { font-size: 0.72rem; opacity: 0.6; margin-top: 12px; }

/* 页脚 */
.footer {
    text-align: center; padding: 20px; border-top: 1px solid var(--gray-200);
    background: #fafbfc; color: var(--gray-500); font-size: 0.75rem;
}
.footer a { color: var(--gray-500); text-decoration: none; }
.footer a:hover { color: var(--blue-500); }
.footer-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 3px; align-items: center; margin-bottom: 4px; }
.footer-links span { color: #ccc; }
.footer-record { margin-top: 6px; font-size: 0.72rem; color: #aaa; }
.footer-record a { color: #aaa; }
.footer-record a:hover { color: var(--blue-500); }

/* 响应式 */
@media (max-width: 700px) {
    .hero h1 { font-size: 1.5rem; }
    .hero-desc { font-size: 0.82rem; }
    .btn { padding: 9px 16px; font-size: 0.78rem; }
    .features-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
    .feature-card { padding: 18px 12px; }
    .feature-card h3 { font-size: 0.8rem; }
    .feature-card p { font-size: 0.72rem; }
    .section { padding: 40px 14px; }
    .section-title { font-size: 1.2rem; }
    .step-arrow { display: none; }
    .steps-row { gap: 8px; }
    .step-item { min-width: 80px; padding: 10px 6px; }
    .stats-row { gap: 18px; }
    .stat-item h2 { font-size: 1.3rem; }
    .cta-box { padding: 28px 16px; }
    .cta-box h2 { font-size: 1.1rem; }
    .qr-card img { width: 120px; height: 120px; }
}
@media (max-width: 400px) {
    .features-grid { grid-template-columns: 1fr; }
    .nav-brand { font-size: 0.85rem; gap: 4px; }
    .nav-brand-icon { width: 22px; height: 22px; border-radius: 4px; }
    .nav-brand-icon svg { width: 12px; height: 12px; }
    .nav-links a { font-size: 0.7rem; padding: 4px 8px; }
    .nav-btn { padding: 5px 10px !important; font-size: 0.7rem !important; }
    .hero { padding: 90px 12px 40px; }
    .hero h1 { font-size: 1.3rem; }
    .qr-card img { width: 100px; height: 100px; }
}