:root {
    --primary: rgb(70,139,223);
    --primary-dark: #245fa8;
    --primary-soft: #edf6ff;
    --primary-mid: #d7eaff;
    --ink: #122033;
    --muted: #637083;
    --line: #e3ecf7;
    --card: #ffffff;
    --bg: #f6faff;
    --safe: #16a085;
    --warning: #f59e0b;
    --radius: 22px;
    --shadow: 0 18px 50px rgba(33, 84, 144, 0.10);
}

* { 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, #f4f9ff 0%, #ffffff 42%, #f7fbff 100%);
    line-height: 1.72;
    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: 20;
    background: rgba(255,255,255,.9);
    border-bottom: 1px solid rgba(215,234,255,.75);
    backdrop-filter: blur(16px);
}
.nav-wrap { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; color: #10223a; letter-spacing: .2px; }
.logo img { width: 38px; height: 38px; border-radius: 12px; box-shadow: 0 8px 20px rgba(70,139,223,.18); }
.logo span { font-size: 18px; }
.nav-toggle { width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 14px; background: #fff; display: inline-flex; flex-direction: column; justify-content: center; gap: 5px; padding: 0 10px; }
.nav-toggle span { height: 2px; background: var(--ink); border-radius: 3px; }
.site-nav { display: none; position: absolute; left: 16px; right: 16px; top: 76px; padding: 12px; background: #fff; border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); }
.site-nav.open { display: grid; gap: 6px; }
.site-nav a { padding: 11px 14px; border-radius: 12px; color: #334155; font-size: 15px; }
.site-nav a.active, .site-nav a:hover { background: var(--primary-soft); color: var(--primary-dark); }

.section { padding: 54px 0; }
.section-tight { padding: 36px 0; }
.section-head { margin-bottom: 22px; }
.eyebrow, .badge { display: inline-flex; align-items: center; gap: 6px; padding: 7px 12px; border-radius: 999px; background: var(--primary-soft); color: var(--primary-dark); font-size: 13px; font-weight: 700; }
h1, h2, h3 { line-height: 1.25; margin: 0; color: #10203a; }
h1 { font-size: clamp(34px, 7vw, 58px); letter-spacing: -1.4px; }
h2 { font-size: clamp(26px, 5vw, 38px); letter-spacing: -.7px; }
h3 { font-size: 19px; }
p { margin: 12px 0 0; color: var(--muted); }
.lead { font-size: 17px; color: #46576f; }
.gradient-bg { background: radial-gradient(circle at 15% 10%, rgba(70,139,223,.18), transparent 28%), radial-gradient(circle at 85% 0%, rgba(70,139,223,.12), transparent 30%); }
.hero { padding: 50px 0 58px; }
.hero-layout { display: grid; gap: 30px; align-items: center; }
.hero-copy { position: relative; z-index: 1; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 22px 0 26px; }
.hero-tags span { padding: 8px 12px; border-radius: 999px; background: rgba(255,255,255,.86); border: 1px solid var(--line); color: #31516f; font-size: 13px; }
.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; box-shadow: 0 12px 26px rgba(70,139,223,.27); 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 32px rgba(70,139,223,.32); }
.hero-note { margin-top: 14px; font-size: 13px; color: #718096; }
.product-visual { position: relative; min-height: 420px; border-radius: 30px; padding: 24px; background: linear-gradient(145deg, rgba(255,255,255,.88), rgba(237,246,255,.92)); border: 1px solid rgba(202,224,249,.9); box-shadow: var(--shadow); overflow: hidden; }
.product-visual:before { content: ""; position: absolute; inset: auto -40px -90px auto; width: 230px; height: 230px; border-radius: 50%; background: rgba(70,139,223,.16); }
.app-shot { width: min(260px, 72vw); margin: 0 auto; filter: drop-shadow(0 22px 42px rgba(29, 78, 128, .18)); }
.float-card { position: relative; margin-top: -10px; padding: 15px; border-radius: 18px; background: rgba(255,255,255,.92); border: 1px solid var(--line); box-shadow: 0 12px 28px rgba(36, 95, 168, .10); }
.status-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.status-dot { width: 10px; height: 10px; background: var(--safe); border-radius: 50%; box-shadow: 0 0 0 5px rgba(22,160,133,.12); }
.mini-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.mini-tags span { padding: 7px 10px; border-radius: 999px; background: #f3f8ff; color: #31516f; font-size: 12px; border: 1px solid var(--line); }

.stats-strip { display: grid; grid-template-columns: 1fr; gap: 12px; padding: 16px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.stat-item { padding: 16px; border-radius: 18px; background: linear-gradient(180deg, #f8fbff, #fff); }
.stat-item strong { display: block; color: var(--primary-dark); font-size: 22px; }
.stat-item span { color: var(--muted); font-size: 14px; }

.grid, .feature-grid, .category-grid, .scenario-grid, .article-grid { display: grid; gap: 16px; }
.feature-card, .category-card, .scenario-card, .info-card, .faq-item, .step-card, .guide-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; box-shadow: 0 12px 30px rgba(35, 82, 132, .07); }
.feature-card h3, .category-card h3, .scenario-card h3, .step-card h3, .guide-card h3 { margin-bottom: 8px; }
.category-card { display: flex; flex-direction: column; min-height: 168px; transition: transform .2s ease, border .2s ease; }
.category-card:hover { transform: translateY(-3px); border-color: rgba(70,139,223,.45); }
.category-card .link, .guide-card .link { margin-top: auto; color: var(--primary-dark); font-weight: 800; }
.process-steps { display: grid; gap: 14px; counter-reset: step; }
.step-card { position: relative; padding-left: 70px; }
.step-card:before { counter-increment: step; content: counter(step); position: absolute; left: 20px; top: 22px; width: 34px; height: 34px; border-radius: 12px; background: var(--primary); color: #fff; display: grid; place-items: center; font-weight: 800; }
.security-layout { display: grid; gap: 22px; align-items: center; }
.security-panel { padding: 22px; border-radius: 26px; background: linear-gradient(145deg, #ffffff, #edf6ff); border: 1px solid var(--line); box-shadow: var(--shadow); }
.check-list { list-style: none; padding: 0; margin: 16px 0 0; display: grid; gap: 10px; }
.check-list li { position: relative; padding-left: 30px; color: #455870; }
.check-list li:before { content: "✓"; position: absolute; left: 0; top: 0; width: 21px; height: 21px; border-radius: 50%; background: var(--primary-soft); color: var(--primary-dark); display: grid; place-items: center; font-size: 13px; font-weight: 900; }
.note-box { margin-top: 18px; padding: 16px; border-radius: 18px; background: #fff9ed; border: 1px solid #ffe1a8; color: #775014; }
.cta-section { text-align: center; padding: 36px 20px; border-radius: 30px; background: linear-gradient(135deg, #edf6ff, #ffffff 62%, #e7f2ff); border: 1px solid var(--line); box-shadow: var(--shadow); }
.cta-section p { max-width: 680px; margin-left: auto; margin-right: auto; }
.faq-list { display: grid; gap: 14px; }
.faq-item h3 { font-size: 17px; }
.page-hero { padding: 46px 0 24px; }
.page-hero-card { padding: 28px; border-radius: 30px; background: linear-gradient(135deg, #ffffff, #eef7ff); border: 1px solid var(--line); box-shadow: var(--shadow); }
.page-hero h1 { font-size: clamp(32px, 6vw, 48px); }
.content-card { background: #fff; border: 1px solid var(--line); border-radius: 26px; padding: 24px; box-shadow: var(--shadow); }
.article-body h2 { margin-top: 26px; font-size: 24px; }
.article-body p { color: #526174; }
.split-list { display: grid; gap: 12px; margin-top: 16px; }
.split-list div { padding: 16px; border: 1px solid var(--line); border-radius: 18px; background: #f8fbff; }
.timeline { display: grid; gap: 12px; margin-top: 18px; }
.timeline-item { border-left: 3px solid var(--primary); padding: 4px 0 4px 16px; }
.download-panel { display: grid; gap: 16px; align-items: center; margin-top: 22px; }
.only-download { display: flex; align-items: center; justify-content: center; }
.warning-card { background: #fff9ed; border-color: #ffe1a8; }
.footer-grid { display: grid; gap: 22px; padding: 34px 0; }
.site-footer { background: #10203a; color: #e7eef9; margin-top: 50px; }
.site-footer p, .site-footer a, .footer-bottom { color: #b9c6d8; }
.site-footer a { display: block; margin-top: 8px; }
.footer-brand { font-size: 20px; font-weight: 900; color: #fff; }
.site-footer h3 { color: #fff; font-size: 16px; }
.footer-bottom { display: flex; flex-direction: column; gap: 8px; padding: 16px 0 28px; border-top: 1px solid rgba(255,255,255,.12); font-size: 13px; }

@media (min-width: 640px) {
    .stats-strip { grid-template-columns: repeat(2, 1fr); }
    .category-grid, .feature-grid, .scenario-grid, .article-grid { grid-template-columns: repeat(2, 1fr); }
    .download-panel { grid-template-columns: 1fr auto; }
}

@media (min-width: 900px) {
    .container { width: min(100% - 56px, 1160px); }
    .nav-toggle { display: none; }
    .site-nav { position: static; display: flex; align-items: center; gap: 4px; padding: 0; border: 0; box-shadow: none; background: transparent; }
    .site-nav a { font-size: 14px; }
    .hero { padding: 76px 0 72px; }
    .hero-layout { grid-template-columns: 1.05fr .95fr; gap: 54px; }
    .product-visual { min-height: 500px; padding: 34px; }
    .app-shot { width: 300px; }
    .float-card { position: absolute; left: 26px; right: 26px; bottom: 26px; margin-top: 0; }
    .stats-strip { grid-template-columns: repeat(4, 1fr); }
    .feature-grid, .category-grid, .scenario-grid { grid-template-columns: repeat(3, 1fr); }
    .article-grid { grid-template-columns: 1.1fr .9fr; }
    .process-steps { grid-template-columns: repeat(3, 1fr); }
    .step-card { min-height: 180px; }
    .security-layout { grid-template-columns: 1fr 1fr; gap: 42px; }
    .footer-grid { grid-template-columns: 1.4fr .8fr .8fr; }
    .footer-bottom { flex-direction: row; justify-content: space-between; }
}

@media (min-width: 1120px) {
    .process-steps { grid-template-columns: repeat(6, 1fr); }
    .step-card { padding: 68px 16px 18px; }
    .step-card:before { left: 16px; top: 18px; }
}