:root {
    --primary: rgb(70,139,223);
    --primary-dark: #1c5fae;
    --primary-soft: #eaf4ff;
    --ink: #122033;
    --muted: #607089;
    --line: #d9e8f8;
    --card: rgba(255,255,255,0.92);
    --bg: #f7fbff;
    --shadow: 0 18px 42px rgba(39, 94, 154, 0.12);
    --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(--ink);
    background: linear-gradient(180deg, #eef7ff 0%, #ffffff 32%, #f7fbff 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; }
.section { padding: 56px 0; }
.section-title { margin: 0 0 12px; font-size: clamp(26px, 5vw, 42px); line-height: 1.2; letter-spacing: -0.03em; }
.section-lead { margin: 0 auto 28px; color: var(--muted); max-width: 780px; }
.eyebrow, .badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 999px;
    color: var(--primary-dark);
    background: rgba(70,139,223,0.1);
    border: 1px solid rgba(70,139,223,0.18);
    font-size: 13px;
    font-weight: 700;
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(247,251,255,0.86);
    border-bottom: 1px solid rgba(217,232,248,0.8);
    backdrop-filter: blur(16px);
}
.header-inner { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.logo, .footer-logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: -0.02em; }
.logo img, .footer-logo img { width: 36px; height: 36px; border-radius: 10px; }
.logo span, .footer-logo span { font-size: 20px; }
.nav-toggle { display: inline-flex; flex-direction: column; gap: 5px; border: 0; background: #fff; border-radius: 12px; padding: 10px; box-shadow: 0 8px 24px rgba(39,94,154,0.1); }
.nav-toggle span { width: 22px; height: 2px; background: var(--ink); border-radius: 99px; }
.main-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 76px;
    display: none;
    flex-direction: column;
    padding: 12px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}
.main-nav.open { display: flex; }
.main-nav a { padding: 11px 12px; color: #34445b; border-radius: 12px; font-weight: 650; }
.main-nav a.active, .main-nav a:hover { color: var(--primary-dark); background: var(--primary-soft); }
.hero { padding: 44px 0 64px; position: relative; }
.hero::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 560px;
    background: radial-gradient(circle at 20% 10%, rgba(70,139,223,0.22), transparent 34%), radial-gradient(circle at 82% 12%, rgba(119,190,255,0.22), transparent 30%);
    pointer-events: none;
}
.hero-layout { position: relative; display: grid; gap: 32px; align-items: center; }
.hero h1 { margin: 16px 0; font-size: clamp(34px, 8vw, 60px); line-height: 1.08; letter-spacing: -0.055em; }
.hero p { color: var(--muted); font-size: 17px; margin: 0 0 22px; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin: 24px 0; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    border: 1px solid rgba(255,255,255,0.5);
    box-shadow: 0 14px 30px rgba(70,139,223,0.26);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    cursor: pointer;
}
.download-btn:hover { transform: translateY(-2px); background: var(--primary-dark); box-shadow: 0 16px 34px rgba(70,139,223,0.34); }
.trust-note { font-size: 14px; color: var(--muted); }
.hero-tags, .tag-row { display: flex; flex-wrap: wrap; gap: 10px; }
.hero-tags span, .tag-row span {
    padding: 7px 12px;
    border-radius: 999px;
    color: #24435f;
    background: rgba(255,255,255,0.78);
    border: 1px solid rgba(70,139,223,0.14);
    font-size: 13px;
    font-weight: 700;
}
.product-visual {
    position: relative;
    padding: 20px;
    border: 1px solid rgba(70,139,223,0.14);
    border-radius: 30px;
    background: linear-gradient(145deg, rgba(255,255,255,0.98), rgba(234,244,255,0.8));
    box-shadow: var(--shadow);
    overflow: hidden;
}
.product-visual::after { content: ""; position: absolute; width: 190px; height: 190px; right: -70px; top: -70px; background: rgba(70,139,223,0.12); border-radius: 50%; }
.app-frame { max-width: 280px; margin: 0 auto; position: relative; z-index: 1; }
.status-card, .mini-card {
    background: rgba(255,255,255,0.92);
    border: 1px solid rgba(70,139,223,0.16);
    border-radius: 18px;
    padding: 14px;
    box-shadow: 0 12px 26px rgba(36,96,157,0.11);
}
.status-card { margin: -18px auto 0; max-width: 290px; position: relative; z-index: 2; }
.status-line { display: flex; align-items: center; justify-content: space-between; gap: 10px; font-weight: 800; }
.status-line span:last-child { color: #208356; }
.visual-badges { display: grid; grid-template-columns: 1fr; gap: 10px; margin-top: 14px; position: relative; z-index: 2; }
.stats-grid, .feature-grid, .category-grid, .scenario-grid, .article-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.stat-card, .feature-card, .category-card, .scenario-card, .faq-item, .note-card, .step-card, .info-card {
    background: var(--card);
    border: 1px solid rgba(70,139,223,0.14);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: 0 12px 34px rgba(39,94,154,0.08);
}
.stat-card strong { display: block; font-size: 20px; margin-bottom: 6px; }
.stat-card span, .feature-card p, .category-card p, .scenario-card p, .note-card p, .step-card p, .info-card p { color: var(--muted); }
.category-card { position: relative; min-height: 170px; display: flex; flex-direction: column; justify-content: space-between; overflow: hidden; }
.category-card::after { content: ""; position: absolute; right: -38px; bottom: -38px; width: 110px; height: 110px; border-radius: 50%; background: rgba(70,139,223,0.08); }
.category-card h3, .feature-card h3, .scenario-card h3, .note-card h3, .info-card h3 { margin: 0 0 8px; }
.category-card a { color: var(--primary-dark); font-weight: 800; position: relative; z-index: 1; }
.split-layout, .security-layout, .guide-layout { display: grid; gap: 24px; align-items: center; }
.panel {
    background: linear-gradient(145deg, rgba(255,255,255,0.95), rgba(234,244,255,0.88));
    border: 1px solid rgba(70,139,223,0.16);
    border-radius: 28px;
    padding: 26px;
    box-shadow: var(--shadow);
}
.security-list, .check-list { list-style: none; margin: 18px 0 0; padding: 0; display: grid; gap: 12px; }
.security-list li, .check-list li { padding-left: 30px; position: relative; color: #34445b; }
.security-list li::before, .check-list li::before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--primary); font-weight: 900; }
.steps { display: grid; grid-template-columns: 1fr; gap: 14px; counter-reset: step; }
.step-card { position: relative; }
.step-card::before {
    counter-increment: step;
    content: counter(step);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    font-weight: 900;
    margin-bottom: 12px;
}
.faq-list { display: grid; gap: 14px; }
.faq-item h3 { margin: 0 0 8px; }
.faq-item p { margin: 0; color: var(--muted); }
.cta-section {
    margin: 36px auto 0;
    padding: 34px 22px;
    text-align: center;
    border-radius: 30px;
    background: linear-gradient(135deg, rgba(70,139,223,0.14), rgba(255,255,255,0.9));
    border: 1px solid rgba(70,139,223,0.16);
    box-shadow: var(--shadow);
}
.cta-section h2 { margin: 0 0 10px; font-size: clamp(25px, 5vw, 38px); }
.cta-section p { color: var(--muted); margin: 0 auto 22px; max-width: 680px; }
.page-hero { padding: 48px 0 24px; }
.page-hero h1 { margin: 14px 0 12px; font-size: clamp(32px, 7vw, 52px); line-height: 1.12; letter-spacing: -0.045em; }
.page-hero p { color: var(--muted); font-size: 17px; max-width: 790px; }
.article-content { padding-bottom: 56px; }
.article-content p { color: #35465c; }
.inline-actions { margin-top: 24px; }
.warn-card { background: #fff7e8; border-color: #f2d4a7; }
.blue-card { background: #f0f7ff; }
.download-panel { max-width: 760px; margin: 0 auto; text-align: center; }
.download-panel .download-btn { margin-top: 12px; }
.site-footer { background: #0f2034; color: rgba(255,255,255,0.82); padding: 46px 0 24px; margin-top: 34px; }
.footer-grid { display: grid; gap: 24px; }
.site-footer h3 { color: #fff; margin: 0 0 12px; }
.site-footer a { display: block; color: rgba(255,255,255,0.76); margin: 7px 0; }
.site-footer a:hover { color: #fff; }
.footer-logo { color: #fff; margin-bottom: 12px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); margin-top: 28px; padding-top: 18px; font-size: 13px; color: rgba(255,255,255,0.62); }
@media (min-width: 640px) {
    .category-grid, .stats-grid, .article-grid { grid-template-columns: repeat(2, 1fr); }
    .visual-badges { grid-template-columns: repeat(3, 1fr); }
    .steps { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 900px) {
    .nav-toggle { display: none; }
    .main-nav { position: static; display: flex; flex-direction: row; align-items: center; padding: 0; background: transparent; border: 0; box-shadow: none; }
    .main-nav a { padding: 9px 12px; }
    .hero { padding: 76px 0 82px; }
    .hero-layout { grid-template-columns: minmax(0, 1.05fr) minmax(360px, .95fr); gap: 48px; }
    .feature-grid, .category-grid, .scenario-grid { grid-template-columns: repeat(3, 1fr); }
    .stats-grid { grid-template-columns: repeat(4, 1fr); }
    .split-layout, .security-layout, .guide-layout { grid-template-columns: 1fr 1fr; gap: 40px; }
    .steps { grid-template-columns: repeat(4, 1fr); }
    .footer-grid { grid-template-columns: 1.45fr repeat(3, 1fr); }
    .section { padding: 74px 0; }
    .app-frame { max-width: 330px; }
}
@media (min-width: 1120px) {
    .hero h1 { max-width: 820px; }
}