:root {
    --primary: rgb(70,139,223);
    --primary-dark: #2468b9;
    --primary-light: #eaf4ff;
    --text: #142033;
    --muted: #5d6b82;
    --soft: #f7fbff;
    --line: #dce9f7;
    --card: #ffffff;
    --deep: #15375f;
    --radius: 22px;
    --shadow: 0 18px 45px rgba(27, 83, 145, .10);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 12% 0%, rgba(70,139,223,.18), transparent 28rem),
        linear-gradient(180deg, #f5fbff 0%, #ffffff 38%, #f7fbff 100%);
    line-height: 1.72;
    overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
p { margin: 0 0 1rem; color: var(--muted); }

.container {
    width: min(100% - 32px, 1180px);
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.86);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(220,233,247,.75);
}
.header-inner {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; color: var(--deep); }
.logo { width: 38px; height: 38px; border-radius: 12px; }
.brand-text { letter-spacing: .03em; }
.nav-toggle { display: none; }
.nav-toggle-label {
    width: 42px;
    height: 42px;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fff;
}
.nav-toggle-label span { width: 19px; height: 2px; background: var(--deep); border-radius: 2px; }
.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 74px;
    display: none;
    flex-direction: column;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: rgba(255,255,255,.98);
    box-shadow: var(--shadow);
}
.nav-toggle:checked ~ .site-nav { display: flex; }
.site-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #30415c;
    font-size: 15px;
}
.site-nav a:hover,
.site-nav a.active { background: var(--primary-light); color: var(--primary-dark); }

.hero {
    padding: 56px 0 38px;
}
.hero-grid {
    display: grid;
    gap: 32px;
    align-items: center;
}
.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 999px;
    color: var(--primary-dark);
    background: rgba(70,139,223,.11);
    font-size: 13px;
    font-weight: 700;
}
h1, h2, h3 { color: var(--deep); line-height: 1.24; margin: 0; }
h1 { font-size: clamp(32px, 8vw, 58px); letter-spacing: -.04em; margin-top: 18px; }
h2 { font-size: clamp(24px, 4.8vw, 38px); letter-spacing: -.03em; margin-bottom: 14px; }
h3 { font-size: 19px; margin-bottom: 10px; }
.lead { font-size: 17px; color: #4c5f79; margin: 18px 0 22px; max-width: 720px; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin: 22px 0; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    min-width: 148px;
    padding: 13px 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 12px 26px rgba(70,139,223,.28);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.download-btn:hover { transform: translateY(-2px); background: var(--primary-dark); box-shadow: 0 16px 34px rgba(70,139,223,.34); }
.micro-note { font-size: 13px; color: var(--muted); }
.badges { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.badge { padding: 8px 11px; border: 1px solid rgba(70,139,223,.18); background: rgba(255,255,255,.82); border-radius: 999px; font-size: 13px; color: #37516f; }
.hero-visual {
    position: relative;
    padding: 20px;
    border-radius: 32px;
    background: linear-gradient(145deg, rgba(255,255,255,.96), rgba(232,244,255,.88));
    box-shadow: var(--shadow);
    border: 1px solid rgba(220,233,247,.9);
}
.hero-visual::before {
    content: "";
    position: absolute;
    inset: 10% -8% auto auto;
    width: 110px;
    height: 110px;
    background: rgba(70,139,223,.18);
    border-radius: 30px;
    transform: rotate(14deg);
}
.hero-visual img { position: relative; margin: 0 auto; border-radius: 28px; max-height: 520px; }
.stats {
    display: grid;
    grid-template-columns: repeat(2, minmax(0,1fr));
    gap: 12px;
    margin-top: 18px;
}
.stat { padding: 14px; background: #fff; border: 1px solid var(--line); border-radius: 18px; }
.stat strong { display: block; color: var(--deep); font-size: 20px; }
.stat span { color: var(--muted); font-size: 13px; }

.section { padding: 44px 0; }
.section-head { margin-bottom: 22px; max-width: 780px; }
.section-head.center { text-align: center; margin-left: auto; margin-right: auto; }
.card-grid, .feature-grid {
    display: grid;
    gap: 16px;
}
.card, .info-card, .faq-item, .step, .notice {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: var(--shadow);
}
.card.blue, .notice { background: linear-gradient(180deg, #ffffff, var(--primary-light)); }
.card-icon {
    width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    background: var(--primary-light);
    color: var(--primary-dark);
    font-weight: 900;
    margin-bottom: 12px;
}
.two-col { display: grid; gap: 18px; align-items: start; }
.panel {
    padding: 24px;
    border-radius: 28px;
    background: linear-gradient(145deg, #fff, #eff7ff);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.check-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.check-list li { position: relative; padding-left: 28px; color: var(--muted); }
.check-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: .55em;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: inset 0 0 0 4px #dceeff;
}

.page-hero { padding: 48px 0 26px; }
.page-hero .lead { max-width: 840px; }
.content-wrap {
    display: grid;
    gap: 20px;
    padding-bottom: 54px;
}
.article {
    background: rgba(255,255,255,.86);
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 24px;
    box-shadow: var(--shadow);
}
.article h2 { margin-top: 28px; }
.article h2:first-child { margin-top: 0; }
.tip-list { display: grid; gap: 12px; margin-top: 16px; }
.tip { padding: 14px 16px; border-radius: 18px; background: var(--primary-light); color: #34516e; }
.steps { display: grid; gap: 14px; counter-reset: steps; }
.step { position: relative; padding-left: 70px; min-height: 78px; }
.step::before {
    counter-increment: steps;
    content: counter(steps);
    position: absolute;
    left: 20px;
    top: 20px;
    width: 34px;
    height: 34px;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
}
.faq-list { display: grid; gap: 14px; }
.faq-item h2, .faq-item h3 { font-size: 18px; margin-bottom: 8px; }
.cta-band {
    margin-top: 22px;
    padding: 24px;
    border-radius: 28px;
    border: 1px solid rgba(70,139,223,.2);
    background: linear-gradient(135deg, rgba(70,139,223,.12), rgba(255,255,255,.96));
    display: grid;
    gap: 16px;
    align-items: center;
}

.site-footer {
    background: #f0f7ff;
    border-top: 1px solid var(--line);
    padding: 36px 0 24px;
}
.footer-grid { display: grid; gap: 24px; }
.footer-brand { font-size: 22px; font-weight: 900; color: var(--deep); margin-bottom: 8px; }
.site-footer h3 { font-size: 16px; margin-bottom: 12px; }
.site-footer a { display: block; color: var(--muted); margin: 7px 0; }
.site-footer a:hover { color: var(--primary-dark); }
.footer-bottom {
    border-top: 1px solid var(--line);
    margin-top: 24px;
    padding-top: 18px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    color: var(--muted);
    font-size: 13px;
}

@media (min-width: 700px) {
    .container { width: min(100% - 48px, 1180px); }
    .card-grid, .feature-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
    .stats { grid-template-columns: repeat(4, minmax(0,1fr)); }
    .cta-band { grid-template-columns: 1fr auto; }
    .footer-grid { grid-template-columns: 1.5fr 1fr 1fr; }
    .footer-bottom { flex-direction: row; justify-content: space-between; }
}

@media (min-width: 980px) {
    .header-inner { min-height: 78px; }
    .nav-toggle-label { display: none; }
    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        padding: 0;
        border: 0;
        border-radius: 0;
        background: transparent;
        box-shadow: none;
        gap: 4px;
    }
    .site-nav a { padding: 9px 13px; }
    .hero { padding: 76px 0 56px; }
    .hero-grid { grid-template-columns: 1.05fr .95fr; gap: 56px; }
    .card-grid.three, .feature-grid.three { grid-template-columns: repeat(3, minmax(0,1fr)); }
    .two-col { grid-template-columns: 1fr 1fr; gap: 24px; }
    .content-wrap { grid-template-columns: minmax(0, 1fr) 330px; align-items: start; }
    .article { padding: 34px; }
    .section { padding: 58px 0; }
}