:root {
    --primary: rgb(70,139,223);
    --primary-dark: #245eae;
    --primary-soft: #eaf3ff;
    --ink: #122033;
    --muted: #5d6b80;
    --line: #dce8f7;
    --card: rgba(255,255,255,0.88);
    --radius: 22px;
    --shadow: 0 18px 45px rgba(36,94,174,0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    min-width: 320px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    color: var(--ink);
    background:
        radial-gradient(circle at 15% 5%, rgba(70,139,223,0.20), transparent 30%),
        radial-gradient(circle at 85% 10%, rgba(115,177,255,0.18), transparent 28%),
        linear-gradient(180deg, #f3f8ff 0%, #ffffff 42%, #f8fbff 100%);
    line-height: 1.75;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,0.86);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(220,232,247,0.85);
}
.header-inner {
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: -0.02em; }
.logo img { width: 38px; height: 38px; border-radius: 12px; }
.logo span { font-size: 1.05rem; }
.nav-toggle {
    width: 44px;
    height: 44px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fff;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    cursor: pointer;
}
.nav-toggle span { width: 19px; height: 2px; background: var(--ink); border-radius: 4px; }
.site-nav {
    position: absolute;
    top: 70px;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    padding: 12px;
    background: rgba(255,255,255,0.98);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}
.site-nav.open { display: flex; }
.site-nav a {
    padding: 12px 14px;
    border-radius: 12px;
    color: var(--muted);
    font-weight: 650;
}
.site-nav a.active,
.site-nav a:hover { color: var(--primary-dark); background: var(--primary-soft); }

.hero, .page-hero {
    padding: 54px 0 34px;
}
.hero-grid {
    display: grid;
    gap: 34px;
    align-items: center;
}
.badge-row { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 18px; }
.badge {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(70,139,223,0.10);
    border: 1px solid rgba(70,139,223,0.20);
    color: var(--primary-dark);
    font-size: 0.9rem;
    font-weight: 700;
}
h1 {
    margin: 0 0 18px;
    font-size: clamp(2.05rem, 7vw, 4.4rem);
    line-height: 1.08;
    letter-spacing: -0.05em;
}
h2 {
    margin: 0 0 14px;
    font-size: clamp(1.55rem, 4vw, 2.45rem);
    line-height: 1.18;
    letter-spacing: -0.035em;
}
h3 { margin: 0 0 10px; font-size: 1.12rem; }
p { margin: 0 0 16px; color: var(--muted); }
.lead { font-size: 1.08rem; color: #3d4d63; max-width: 720px; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 14px; margin-top: 26px; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 50px;
    padding: 0 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 28px rgba(70,139,223,0.26);
    transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
    touch-action: manipulation;
}
.download-btn:hover { transform: translateY(-2px); background: var(--primary-dark); box-shadow: 0 18px 34px rgba(70,139,223,0.30); }
.note-inline { color: var(--muted); font-size: .95rem; }
.hero-visual {
    position: relative;
    padding: 22px;
    border-radius: 32px;
    background: linear-gradient(145deg, rgba(255,255,255,0.96), rgba(234,243,255,0.9));
    box-shadow: var(--shadow);
    border: 1px solid rgba(255,255,255,0.8);
}
.hero-visual:before {
    content: "";
    position: absolute;
    inset: 18px -10px -14px 30px;
    border-radius: 32px;
    background: rgba(70,139,223,0.10);
    z-index: -1;
}
.hero-visual img { width: min(420px, 100%); margin: 0 auto; }
.stat-strip {
    display: grid;
    gap: 12px;
    margin-top: 20px;
}
.stat-card {
    padding: 16px;
    border-radius: 18px;
    background: rgba(255,255,255,0.82);
    border: 1px solid var(--line);
}
.stat-card strong { display: block; font-size: 1.25rem; color: var(--primary-dark); }
.stat-card span { color: var(--muted); font-size: .92rem; }

.section { padding: 34px 0; }
.section-head { margin-bottom: 20px; max-width: 760px; }
.grid { display: grid; gap: 18px; }
.feature-grid { display: grid; gap: 18px; }
.card {
    padding: 22px;
    border-radius: var(--radius);
    background: var(--card);
    border: 1px solid rgba(220,232,247,0.95);
    box-shadow: 0 14px 34px rgba(18,32,51,0.06);
}
.card.soft { background: linear-gradient(145deg, #ffffff, #eef6ff); }
.card h3 { color: #182842; }
.card-icon {
    width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    background: rgba(70,139,223,0.12);
    color: var(--primary-dark);
    font-weight: 900;
    margin-bottom: 12px;
}
.split {
    display: grid;
    gap: 22px;
    align-items: center;
}
.panel {
    padding: 26px;
    border-radius: 28px;
    background: linear-gradient(135deg, rgba(70,139,223,0.12), rgba(255,255,255,0.86));
    border: 1px solid rgba(70,139,223,0.18);
}
.list-clean { padding: 0; margin: 14px 0 0; list-style: none; display: grid; gap: 10px; }
.list-clean li {
    position: relative;
    padding-left: 26px;
    color: #43536a;
}
.list-clean li:before {
    content: "";
    position: absolute;
    left: 0;
    top: .72em;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--primary);
}
.faq-list { display: grid; gap: 14px; }
.faq-item {
    padding: 20px;
    border-radius: 18px;
    background: #fff;
    border: 1px solid var(--line);
}
.faq-item h3 { font-size: 1rem; }
.cta-band {
    margin: 22px 0 0;
    padding: 26px;
    border-radius: 28px;
    background: linear-gradient(135deg, rgba(70,139,223,0.14), rgba(255,255,255,0.94));
    border: 1px solid rgba(70,139,223,0.20);
}
.step-list { counter-reset: step; display: grid; gap: 16px; margin: 0; padding: 0; list-style: none; }
.step-list li {
    counter-increment: step;
    display: grid;
    grid-template-columns: 42px 1fr;
    gap: 14px;
    align-items: start;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
}
.step-list li:before {
    content: counter(step);
    width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    color: #fff;
    background: var(--primary);
    font-weight: 900;
}

.site-footer {
    margin-top: 48px;
    padding: 44px 0 24px;
    background: #10233c;
    color: #d9e6f7;
}
.footer-grid { display: grid; gap: 26px; }
.footer-brand { font-size: 1.2rem; font-weight: 900; margin-bottom: 10px; color: #fff; }
.site-footer p { color: #aebfd6; }
.site-footer h3 { color: #fff; font-size: 1rem; }
.site-footer a { display: block; color: #b9c9df; margin: 8px 0; }
.site-footer a:hover { color: #fff; }
.footer-bottom {
    margin-top: 28px;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,0.12);
    display: flex;
    flex-direction: column;
    gap: 8px;
    color: #9fb1c9;
    font-size: .9rem;
}

@media (min-width: 680px) {
    .container { width: min(1120px, calc(100% - 56px)); }
    .hero, .page-hero { padding: 72px 0 44px; }
    .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .stat-strip { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .footer-grid { grid-template-columns: 1.4fr repeat(3, 1fr); }
    .footer-bottom { flex-direction: row; justify-content: space-between; }
}

@media (min-width: 920px) {
    .nav-toggle { display: none; }
    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        padding: 0;
        background: transparent;
        border: 0;
        box-shadow: none;
        gap: 4px;
    }
    .site-nav a { padding: 10px 12px; font-size: .96rem; }
    .hero-grid { grid-template-columns: minmax(0, 1.06fr) minmax(340px, .94fr); gap: 58px; }
    .split { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 34px; }
    .feature-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .section { padding: 48px 0; }
    .card { padding: 26px; }
}