* {
    box-sizing: border-box;
}

:root {
    --primary: rgb(70,139,223);
    --primary-dark: #1f5fae;
    --primary-soft: #eef6ff;
    --ink: #132238;
    --muted: #5f6f85;
    --line: #d9e7f6;
    --card: #ffffff;
    --bg: #f7fbff;
    --shadow: 0 16px 40px rgba(28, 91, 160, 0.10);
    --radius: 22px;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    color: var(--ink);
    background: linear-gradient(180deg, #f3f9ff 0%, #ffffff 44%, #f7fbff 100%);
    line-height: 1.75;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    display: block;
}

.container {
    width: min(100% - 32px, 1160px);
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.92);
    border-bottom: 1px solid rgba(217, 231, 246, 0.85);
    backdrop-filter: blur(18px);
}

.nav-shell {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.brand,
.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: #0e2a4d;
}

.brand-logo,
.footer-brand img {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    box-shadow: 0 8px 22px rgba(70,139,223,0.22);
}

.nav-toggle {
    width: 44px;
    height: 44px;
    display: inline-grid;
    place-items: center;
    gap: 4px;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fff;
}

.nav-toggle span {
    width: 20px;
    height: 2px;
    background: var(--ink);
    border-radius: 999px;
}

.site-nav {
    position: absolute;
    top: 68px;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    padding: 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}

.site-nav.open {
    display: flex;
}

.site-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #415169;
    font-size: 15px;
    font-weight: 650;
}

.site-nav a.active,
.site-nav a:hover {
    color: var(--primary-dark);
    background: var(--primary-soft);
}

.hero {
    padding: 54px 0 34px;
}

.hero-grid {
    display: grid;
    gap: 30px;
    align-items: center;
}

.eyebrow,
.badge {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    gap: 8px;
    padding: 6px 12px;
    border: 1px solid rgba(70,139,223,0.18);
    border-radius: 999px;
    background: rgba(70,139,223,0.08);
    color: var(--primary-dark);
    font-size: 13px;
    font-weight: 700;
}

h1,
h2,
h3 {
    line-height: 1.25;
    color: #10233d;
    margin: 0 0 14px;
}

h1 {
    font-size: clamp(32px, 7vw, 58px);
    letter-spacing: -0.05em;
}

h2 {
    font-size: clamp(26px, 4.5vw, 38px);
    letter-spacing: -0.035em;
}

h3 {
    font-size: 20px;
}

p {
    margin: 0 0 16px;
    color: var(--muted);
}

.hero-copy p {
    font-size: 17px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    margin-top: 24px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 22px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    letter-spacing: 0.02em;
    box-shadow: 0 14px 30px rgba(70,139,223,0.28);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    background: var(--primary-dark);
    box-shadow: 0 18px 34px rgba(70,139,223,0.34);
}

.hero-note {
    font-size: 13px;
    color: #718199;
}

.hero-card {
    position: relative;
    padding: 18px;
    border-radius: 30px;
    background: linear-gradient(150deg, rgba(70,139,223,0.18), #ffffff 48%, rgba(236,247,255,0.9));
    border: 1px solid rgba(70,139,223,0.16);
    box-shadow: var(--shadow);
}

.product-frame {
    max-width: 360px;
    margin: 0 auto;
    padding: 16px;
    border-radius: 28px;
    background: #fff;
    box-shadow: inset 0 0 0 1px #eaf1f8, 0 26px 50px rgba(32, 91, 154, 0.12);
}

.trust-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}

.trust-tags span,
.check-list li,
.step-list li {
    border: 1px solid var(--line);
    background: rgba(255,255,255,0.82);
    color: #38516d;
}

.trust-tags span {
    padding: 8px 10px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
}

.section {
    padding: 42px 0;
}

.section-head {
    max-width: 760px;
    margin-bottom: 24px;
}

.card,
.info-card,
.faq-item,
.notice,
.guide-panel {
    background: var(--card);
    border: 1px solid rgba(217, 231, 246, 0.92);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.card,
.info-card,
.faq-item,
.notice,
.guide-panel {
    padding: 22px;
}

.feature-grid,
.card-grid,
.two-col,
.stats-grid,
.faq-grid,
.page-grid {
    display: grid;
    gap: 16px;
}

.feature-grid,
.card-grid,
.stats-grid,
.faq-grid {
    grid-template-columns: 1fr;
}

.card-icon {
    width: 44px;
    height: 44px;
    display: grid;
    place-items: center;
    margin-bottom: 14px;
    border-radius: 16px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
}

.soft-section {
    background: linear-gradient(180deg, rgba(238,246,255,0.92), rgba(255,255,255,0.72));
    border-top: 1px solid #edf4fb;
    border-bottom: 1px solid #edf4fb;
}

.stats-grid .card strong {
    display: block;
    margin-bottom: 4px;
    color: var(--primary-dark);
    font-size: 30px;
    line-height: 1.1;
}

.check-list,
.step-list {
    display: grid;
    gap: 12px;
    padding: 0;
    margin: 18px 0 0;
    list-style: none;
}

.check-list li,
.step-list li {
    padding: 14px 16px;
    border-radius: 16px;
}

.step-list {
    counter-reset: step;
}

.step-list li {
    position: relative;
    padding-left: 56px;
}

.step-list li::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 16px;
    top: 14px;
    width: 28px;
    height: 28px;
    display: grid;
    place-items: center;
    border-radius: 10px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
}

.page-hero {
    padding: 48px 0 26px;
}

.page-hero .container {
    display: grid;
    gap: 18px;
}

.page-hero p {
    max-width: 780px;
    font-size: 17px;
}

.page-grid {
    grid-template-columns: 1fr;
    align-items: start;
}

.article-content {
    display: grid;
    gap: 18px;
}

.article-content .card p:last-child,
.faq-item p:last-child,
.notice p:last-child,
.info-card p:last-child {
    margin-bottom: 0;
}

.cta-panel {
    padding: 28px;
    border-radius: 28px;
    background: linear-gradient(135deg, rgba(70,139,223,0.14), #ffffff 48%, rgba(232,245,255,0.95));
    border: 1px solid rgba(70,139,223,0.18);
    box-shadow: var(--shadow);
}

.faq-item h3 {
    margin-bottom: 8px;
}

.site-footer {
    margin-top: 34px;
    padding: 40px 0 20px;
    background: #10233d;
    color: #d9e7f6;
}

.site-footer p,
.site-footer a,
.footer-bottom {
    color: #b9c7d8;
}

.footer-grid {
    display: grid;
    gap: 24px;
}

.site-footer h3 {
    color: #fff;
    font-size: 16px;
}

.site-footer a {
    display: block;
    margin: 7px 0;
    font-size: 14px;
}

.footer-brand {
    color: #fff;
    margin-bottom: 12px;
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 28px;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,0.12);
    font-size: 13px;
}

@media (min-width: 720px) {
    .container {
        width: min(100% - 48px, 1160px);
    }

    .hero {
        padding: 76px 0 48px;
    }

    .feature-grid,
    .card-grid,
    .stats-grid,
    .faq-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .two-col,
    .page-grid {
        grid-template-columns: repeat(2, 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: 980px) {
    .nav-toggle {
        display: none;
    }

    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        width: auto;
        padding: 0;
        border: 0;
        background: transparent;
        box-shadow: none;
    }

    .site-nav a {
        padding: 8px 11px;
    }

    .hero-grid {
        grid-template-columns: 1.05fr .95fr;
    }

    .feature-grid,
    .card-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .stats-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .page-grid {
        grid-template-columns: minmax(0, 1.25fr) minmax(300px, .75fr);
    }

    .section {
        padding: 58px 0;
    }

    .page-hero {
        padding: 70px 0 34px;
    }
}