:root {
    --primary: rgb(70,139,223);
    --primary-dark: #2266b5;
    --primary-soft: #eaf4ff;
    --ink: #132238;
    --muted: #5d6d82;
    --line: #dbe8f7;
    --card: rgba(255,255,255,0.9);
    --bg: #f6faff;
    --shadow: 0 18px 48px rgba(35, 92, 160, 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, #f4f9ff 0%, #ffffff 42%, #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(255,255,255,0.86);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(211,227,247,0.8);
}
.header-inner { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; color: #15314f; letter-spacing: .02em; }
.logo img { width: 38px; height: 38px; border-radius: 12px; }
.nav-toggle { width: 44px; height: 42px; border: 1px solid var(--line); background: #fff; border-radius: 14px; display: grid; place-content: center; gap: 5px; }
.nav-toggle span { width: 19px; height: 2px; background: var(--ink); display: block; border-radius: 99px; }
.site-nav { display: none; position: absolute; left: 16px; right: 16px; top: 72px; padding: 12px; background: #fff; border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); }
.site-nav.open { display: grid; }
.site-nav a { padding: 11px 12px; border-radius: 12px; color: #41536a; font-size: 15px; }
.site-nav a.active, .site-nav a:hover { background: var(--primary-soft); color: var(--primary-dark); }
.hero { padding: 46px 0 34px; position: relative; }
.hero::before { content: ""; position: absolute; inset: 0 0 auto 0; height: 72%; background: radial-gradient(circle at top left, rgba(70,139,223,.18), transparent 36%), radial-gradient(circle at 80% 20%, rgba(70,139,223,.14), transparent 28%); pointer-events: none; }
.hero-layout { position: relative; display: grid; gap: 28px; align-items: center; }
.eyebrow, .badge { display: inline-flex; align-items: center; gap: 8px; padding: 7px 12px; border-radius: 999px; background: var(--primary-soft); color: var(--primary-dark); font-weight: 700; font-size: 13px; }
h1 { font-size: clamp(32px, 8vw, 58px); line-height: 1.12; margin: 18px 0 18px; letter-spacing: -0.04em; }
h2 { font-size: clamp(25px, 5.8vw, 38px); line-height: 1.22; margin: 0 0 14px; letter-spacing: -0.03em; }
h3 { font-size: 19px; line-height: 1.35; margin: 0 0 10px; }
p { color: var(--muted); margin: 0 0 14px; }
.lead { font-size: 17px; color: #40526a; max-width: 680px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 22px 0; }
.hero-tags span, .mini-tag { padding: 8px 11px; border: 1px solid #d7e6f8; background: rgba(255,255,255,.75); border-radius: 999px; color: #38516d; font-size: 13px; }
.download-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 13px 24px; border-radius: 999px; background: var(--primary); color: #fff; font-weight: 800; box-shadow: 0 12px 26px rgba(70,139,223,.24); transition: transform .2s ease, box-shadow .2s ease; }
.download-btn:hover { transform: translateY(-2px); box-shadow: 0 16px 32px rgba(70,139,223,.28); }
.hero-visual { position: relative; min-height: 390px; border-radius: 30px; background: linear-gradient(145deg, rgba(255,255,255,.92), rgba(235,246,255,.9)); border: 1px solid rgba(198,222,249,.8); box-shadow: var(--shadow); padding: 24px; overflow: hidden; }
.hero-visual::after { content:""; position:absolute; width:220px; height:220px; border-radius:50%; background: rgba(70,139,223,.12); right:-64px; bottom:-58px; }
.app-shot { width: 210px; margin: 0 auto; filter: drop-shadow(0 28px 35px rgba(25,70,118,.22)); position: relative; z-index: 2; }
.float-card { position: absolute; z-index: 3; background: rgba(255,255,255,.92); border: 1px solid var(--line); box-shadow: 0 14px 35px rgba(38,96,161,.14); border-radius: 18px; padding: 13px 15px; max-width: 190px; }
.float-card strong { display: block; color: var(--ink); margin-bottom: 2px; }
.float-card small { color: var(--muted); }
.float-card.one { left: 18px; top: 26px; }
.float-card.two { right: 18px; top: 112px; }
.float-card.three { left: 20px; bottom: 34px; }
.status-dot { width: 8px; height: 8px; display: inline-block; background: #32b783; border-radius: 99px; margin-right: 6px; }
.section { padding: 44px 0; }
.section-head { max-width: 760px; margin-bottom: 24px; }
.center { text-align: center; margin-left: auto; margin-right: auto; }
.trust-strip { display: grid; gap: 14px; padding: 18px; background: rgba(255,255,255,.82); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.trust-item { padding: 16px; border-radius: 18px; background: linear-gradient(180deg,#fff,#f3f9ff); border: 1px solid #e3effb; }
.trust-item strong { display: block; font-size: 18px; margin-bottom: 4px; }
.path-grid, .category-grid, .feature-grid, .scenario-grid, .article-grid, .faq-grid { display: grid; gap: 16px; }
.path-card, .category-card, .feature-card, .scenario-card, .info-card, .faq-item, .step, .notice-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: 0 12px 34px rgba(45,93,151,.08); }
.category-card, .path-card { transition: transform .2s ease, border-color .2s ease; }
.category-card:hover, .path-card:hover { transform: translateY(-3px); border-color: rgba(70,139,223,.45); }
.card-link { color: var(--primary-dark); font-weight: 800; display: inline-flex; margin-top: 10px; }
.step-num, .icon-box { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 14px; background: var(--primary-soft); color: var(--primary-dark); font-weight: 900; margin-bottom: 14px; }
.security-layout, .split-layout { display: grid; gap: 22px; align-items: center; }
.security-panel { background: linear-gradient(145deg, #ffffff, #eef7ff); border: 1px solid var(--line); border-radius: 28px; padding: 24px; box-shadow: var(--shadow); }
.security-row { display: flex; align-items: flex-start; gap: 12px; padding: 14px 0; border-bottom: 1px solid #dfebf7; }
.security-row:last-child { border-bottom: 0; }
.check { width: 24px; height: 24px; flex: 0 0 24px; border-radius: 8px; background: var(--primary); color: #fff; display: grid; place-items: center; font-size: 14px; font-weight: 900; }
.steps { display: grid; gap: 14px; counter-reset: step; }
.step { position: relative; }
.step small { color: var(--primary-dark); font-weight: 800; }
.cta-section { margin: 44px 0; padding: 32px 20px; text-align: center; border-radius: 30px; background: linear-gradient(135deg, #eaf4ff, #ffffff 55%, #edf7ff); border: 1px solid var(--line); box-shadow: var(--shadow); }
.page-hero { padding: 42px 0 20px; }
.page-card { background: rgba(255,255,255,.88); border: 1px solid var(--line); border-radius: 28px; padding: 26px; box-shadow: var(--shadow); }
.article-layout { display: grid; gap: 24px; }
.article-content { background: #fff; border: 1px solid var(--line); border-radius: 28px; padding: 24px; box-shadow: 0 14px 40px rgba(45,93,151,.08); }
.article-content h2 { font-size: 26px; margin-top: 28px; }
.guide-list { margin: 0; padding-left: 20px; color: var(--muted); }
.guide-list li { margin-bottom: 10px; }
.highlight-box { margin: 22px 0; padding: 20px; border-radius: 20px; background: linear-gradient(135deg, #eef7ff, #ffffff); border: 1px solid #d9e9fa; }
.download-area { margin-top: 24px; }
.faq-item details { cursor: pointer; }
.faq-item summary { font-weight: 800; color: #1b3047; }
.faq-item p { margin-top: 12px; }
.footer-grid { display: grid; gap: 22px; padding: 36px 0; }
.site-footer { margin-top: 34px; background: #f0f7ff; border-top: 1px solid var(--line); }
.footer-brand { display: inline-flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.footer-brand img { width: 34px; height: 34px; border-radius: 10px; }
.site-footer h3 { font-size: 16px; }
.site-footer a { display: block; color: #52677f; margin: 7px 0; }
.footer-bottom { border-top: 1px solid #d7e7f7; padding: 16px 0 24px; display: grid; gap: 6px; color: #62758c; font-size: 13px; }
@media (min-width: 640px) {
    .trust-strip, .category-grid, .path-grid, .feature-grid, .scenario-grid, .article-grid, .faq-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@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; background: transparent; border: 0; box-shadow: none; }
    .site-nav a { padding: 10px 13px; }
    .hero { padding: 72px 0 56px; }
    .hero-layout { grid-template-columns: minmax(0, 1.05fr) minmax(360px, .95fr); gap: 44px; }
    .trust-strip { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .category-grid, .feature-grid, .scenario-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .path-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .security-layout, .split-layout, .article-layout { grid-template-columns: minmax(0, 1fr) minmax(330px, .82fr); }
    .steps { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .footer-grid { grid-template-columns: 1.5fr 1fr 1fr 1fr; }
    .footer-bottom { grid-template-columns: 1fr auto; align-items: center; }
}
@media (min-width: 1100px) {
    .section { padding: 58px 0; }
    .app-shot { width: 244px; }
    .hero-visual { min-height: 430px; }
}