:root {
    --primary: #2980FE;
    --primary-dark: #1768dc;
    --primary-soft: #edf5ff;
    --bg: #ffffff;
    --bg-soft: #f7f9fc;
    --bg-blue: #f2f7ff;
    --text: #1f2937;
    --muted: #64748b;
    --line: #e5eaf2;
    --card: #ffffff;
    --shadow: 0 18px 55px rgba(26, 75, 140, .10);
    --radius: 22px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background: linear-gradient(180deg, #ffffff 0%, #f8fbff 50%, #ffffff 100%);
    line-height: 1.72;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
}
.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;
    letter-spacing: -.02em;
    color: #0f172a;
    white-space: nowrap;
}
.logo { width: 34px; height: 34px; object-fit: contain; }
.nav-toggle {
    border: 1px solid var(--line);
    background: #fff;
    color: #0f172a;
    width: 42px;
    height: 42px;
    border-radius: 14px;
    font-size: 20px;
}
.site-nav {
    display: none;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    padding: 12px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: var(--shadow);
}
.site-nav.is-open { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.site-nav a {
    padding: 10px 12px;
    color: #475569;
    border-radius: 12px;
    font-size: 14px;
}
.site-nav a.active,
.site-nav a:hover { color: var(--primary); background: var(--primary-soft); }

.section { padding: 64px 0; }
.section-header { max-width: 760px; margin-bottom: 28px; }
.section-eyebrow, .badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary);
    background: var(--primary-soft);
    border: 1px solid #d7e9ff;
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 12px;
}
h1, h2, h3 { line-height: 1.2; margin: 0 0 14px; color: #111827; }
h1 { font-size: clamp(34px, 7vw, 62px); letter-spacing: -.05em; }
h2 { font-size: clamp(26px, 4.5vw, 42px); letter-spacing: -.035em; }
h3 { font-size: 20px; letter-spacing: -.02em; }
p { margin: 0 0 14px; color: var(--muted); }
.lead { font-size: 17px; color: #475569; }

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    min-width: 148px;
    padding: 13px 22px;
    border-radius: 999px;
    border: 1px solid var(--primary);
    background: linear-gradient(135deg, var(--primary), #4a98ff);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 28px rgba(41, 128, 254, .22);
    transition: transform .2s ease, box-shadow .2s ease;
}
.download-btn:hover { transform: translateY(-2px); box-shadow: 0 18px 36px rgba(41, 128, 254, .30); }
.text-link { color: var(--primary); font-weight: 800; }

.product-hero {
    position: relative;
    padding: 72px 0 56px;
    overflow: hidden;
    background:
        radial-gradient(circle at 15% 10%, rgba(41,128,254,.14), transparent 34%),
        radial-gradient(circle at 85% 20%, rgba(41,128,254,.10), transparent 32%),
        linear-gradient(180deg, #fff 0%, #f4f8ff 100%);
}
.hero-grid {
    display: grid;
    gap: 34px;
    align-items: center;
}
.hero-actions { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin: 24px 0 18px; }
.security-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.security-tags span, .mini-tag {
    display: inline-flex;
    color: #2563eb;
    background: #ffffff;
    border: 1px solid #dbeafe;
    border-radius: 999px;
    padding: 7px 11px;
    font-size: 13px;
    font-weight: 700;
}
.app-visual {
    position: relative;
    border-radius: 34px;
    padding: 22px;
    background: linear-gradient(145deg, rgba(255,255,255,.95), rgba(234,244,255,.88));
    border: 1px solid #dceaff;
    box-shadow: var(--shadow);
}
.app-visual::before {
    content: "";
    position: absolute;
    inset: 14px;
    border-radius: 28px;
    border: 1px solid rgba(41,128,254,.12);
    pointer-events: none;
}
.hero-phone { width: min(360px, 86%); margin: 0 auto; filter: drop-shadow(0 26px 40px rgba(15, 43, 92, .18)); }
.float-card {
    position: relative;
    margin-top: 12px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}
.float-card span {
    border-radius: 16px;
    background: #fff;
    border: 1px solid var(--line);
    padding: 10px;
    font-size: 13px;
    color: #475569;
    text-align: center;
    box-shadow: 0 10px 22px rgba(15, 43, 92, .07);
}
.float-card span:first-child { grid-column: 1 / -1; color: var(--primary); font-weight: 800; }

.feature-shortcuts { padding: 34px 0 26px; }
.shortcut-grid, .category-grid, .risk-grid, .faq-grid, .info-grid {
    display: grid;
    gap: 16px;
}
.shortcut-card, .feature-card, .category-card, .risk-card, .faq-item, .info-card, .step-card, .note-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: 0 12px 35px rgba(15, 43, 92, .06);
}
.shortcut-card { min-height: 170px; }
.card-icon {
    width: 38px;
    height: 38px;
    border-radius: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
    background: var(--primary-soft);
    color: var(--primary);
    font-weight: 900;
}

.product-section { padding: 74px 0; }
.product-section.alt { background: var(--bg-blue); }
.split {
    display: grid;
    gap: 28px;
    align-items: center;
}
.split.reverse .visual { order: -1; }
.visual {
    border-radius: 28px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    padding: 24px;
}
.visual.blue-panel { background: linear-gradient(145deg, #f8fbff, #eef6ff); }
.check-list, .plain-list { display: grid; gap: 10px; margin: 18px 0; padding: 0; list-style: none; }
.check-list li, .plain-list li {
    position: relative;
    padding-left: 26px;
    color: #475569;
}
.check-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: .62em;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 0 5px var(--primary-soft);
}
.plain-list li::before {
    content: "•";
    color: var(--primary);
    position: absolute;
    left: 6px;
    font-weight: 900;
}

.process-steps { display: grid; gap: 16px; counter-reset: step; }
.step-card { position: relative; overflow: hidden; }
.step-card::before {
    counter-increment: step;
    content: counter(step, decimal-leading-zero);
    display: inline-flex;
    margin-bottom: 12px;
    color: var(--primary);
    font-weight: 900;
    background: var(--primary-soft);
    border-radius: 999px;
    padding: 4px 10px;
}
.risk-card { border-left: 4px solid var(--primary); }
.risk-card strong { display: block; color: #111827; margin-bottom: 6px; }
.category-card { min-height: 190px; }
.category-card a, .shortcut-card a, .step-card a, .risk-card a { color: var(--primary); font-weight: 800; }

.cta-section {
    padding: 64px 0;
    background: linear-gradient(135deg, #eef6ff 0%, #ffffff 55%, #f5f8fc 100%);
}
.cta-box {
    text-align: center;
    border: 1px solid #dceaff;
    border-radius: 30px;
    padding: 36px 24px;
    background: rgba(255,255,255,.82);
    box-shadow: var(--shadow);
}
.cta-box p { max-width: 680px; margin-left: auto; margin-right: auto; }

.page-hero {
    padding: 58px 0 38px;
    background: linear-gradient(180deg, #f4f8ff 0%, #ffffff 100%);
    border-bottom: 1px solid var(--line);
}
.page-hero .container { max-width: 960px; }
.page-layout {
    display: grid;
    gap: 24px;
    padding: 48px 0 72px;
}
.content-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 26px;
    padding: 24px;
    box-shadow: 0 12px 36px rgba(15,43,92,.06);
}
.content-panel h2 { font-size: 28px; margin-top: 26px; }
.content-panel h2:first-child { margin-top: 0; }
.side-panel { display: grid; gap: 16px; align-content: start; }
.note-card { background: var(--bg-blue); }
.note-card h3 { font-size: 18px; }
.page-download { margin-top: 26px; padding-top: 22px; border-top: 1px solid var(--line); }
.steps-list { counter-reset: pageStep; display: grid; gap: 12px; padding: 0; margin: 18px 0; list-style: none; }
.steps-list li {
    counter-increment: pageStep;
    padding: 14px 16px 14px 52px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
    position: relative;
    color: #475569;
}
.steps-list li::before {
    content: counter(pageStep);
    position: absolute;
    left: 16px;
    top: 14px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 900;
}
.faq-list { display: grid; gap: 14px; }
.faq-item h2, .faq-item h3 { font-size: 20px; }
.download-guide { display: grid; gap: 16px; margin-top: 22px; }

.site-footer {
    background: #f6f8fb;
    border-top: 1px solid var(--line);
    padding-top: 44px;
}
.footer-grid { display: grid; gap: 26px; }
.footer-grid p { max-width: 360px; }
.footer-grid h3 { font-size: 16px; margin-bottom: 12px; }
.footer-grid a { display: block; color: #64748b; margin: 8px 0; }
.footer-grid a:hover { color: var(--primary); }
.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: 8px;
    color: #64748b;
    font-size: 13px;
    padding: 24px 0;
    border-top: 1px solid var(--line);
    margin-top: 30px;
}

@media (min-width: 640px) {
    .shortcut-grid { grid-template-columns: repeat(2, 1fr); }
    .category-grid, .risk-grid, .faq-grid, .info-grid { grid-template-columns: repeat(2, 1fr); }
    .download-guide { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 860px) {
    .nav-toggle { display: none; }
    .site-nav {
        position: static;
        display: flex;
        align-items: center;
        justify-content: flex-end;
        gap: 4px;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
    }
    .site-nav a { font-size: 14px; padding: 8px 10px; }
    .hero-grid, .split { grid-template-columns: 1.05fr .95fr; }
    .split.reverse .visual { order: 2; }
    .shortcut-grid { grid-template-columns: repeat(3, 1fr); }
    .process-steps { grid-template-columns: repeat(3, 1fr); }
    .page-layout { grid-template-columns: minmax(0, 1fr) 320px; align-items: start; }
    .content-panel { padding: 34px; }
    .footer-grid { grid-template-columns: 1.6fr 1fr 1fr 1fr; }
    .footer-bottom { flex-direction: row; justify-content: space-between; }
}
@media (min-width: 1080px) {
    .product-hero { padding: 96px 0 70px; }
    .shortcut-grid { grid-template-columns: repeat(6, 1fr); }
    .category-grid { grid-template-columns: repeat(4, 1fr); }
    .risk-grid { grid-template-columns: repeat(4, 1fr); }
    .faq-grid { grid-template-columns: repeat(2, 1fr); }
}