* {
    box-sizing: border-box;
}
:root {
    --primary: rgb(70,139,223);
    --primary-dark: #256ab5;
    --primary-soft: #eaf3ff;
    --ink: #102033;
    --muted: #5f7187;
    --line: #dce8f6;
    --card: rgba(255,255,255,.86);
    --bg: #f7fbff;
    --radius: 22px;
    --shadow: 0 18px 46px rgba(40, 91, 155, .12);
}
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: radial-gradient(circle at 20% 0%, #e9f4ff 0, rgba(233,244,255,0) 34%), linear-gradient(180deg, #f8fbff 0%, #ffffff 48%, #f6faff 100%);
    line-height: 1.72;
    overflow-x: hidden;
}
a {
    color: inherit;
    text-decoration: none;
}
img {
    max-width: 100%;
    display: block;
}
.container {
    width: min(1120px, calc(100% - 36px));
    margin: 0 auto;
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.88);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(215,229,247,.8);
}
.header-inner {
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}
.brand, .footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: .2px;
    color: #12304f;
}
.logo {
    width: 36px;
    height: 36px;
    border-radius: 12px;
}
.nav-toggle {
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 12px;
    padding: 8px 11px;
    font-size: 20px;
    color: var(--ink);
}
.site-nav {
    display: none;
    position: absolute;
    left: 18px;
    right: 18px;
    top: 70px;
    padding: 14px;
    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: 10px 12px;
    border-radius: 12px;
    color: #41566e;
    font-size: 15px;
}
.site-nav a.active, .site-nav a:hover {
    color: var(--primary-dark);
    background: var(--primary-soft);
}
.section {
    padding: 58px 0;
}
.section-title {
    margin: 0 0 14px;
    font-size: clamp(28px, 4.2vw, 44px);
    line-height: 1.18;
    letter-spacing: -.03em;
}
.section-lead {
    margin: 0 0 28px;
    color: var(--muted);
    max-width: 760px;
}
.eyebrow, .badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border: 1px solid rgba(70,139,223,.25);
    color: var(--primary-dark);
    background: rgba(70,139,223,.08);
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 700;
}
.hero-banner {
    padding: 54px 0 34px;
}
.hero-layout {
    display: grid;
    gap: 28px;
    align-items: center;
}
.hero-copy h1 {
    margin: 16px 0;
    font-size: clamp(36px, 8vw, 68px);
    line-height: 1.05;
    letter-spacing: -.055em;
}
.hero-copy p {
    color: var(--muted);
    font-size: 17px;
    margin: 0 0 24px;
}
.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;
    border: 1px solid var(--primary);
    box-shadow: 0 12px 28px rgba(70,139,223,.28);
    transition: transform .2s ease, box-shadow .2s ease;
}
.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 32px rgba(70,139,223,.34);
}
.hero-tags, .tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}
.hero-tags span, .tag-row span {
    display: inline-flex;
    border: 1px solid var(--line);
    background: rgba(255,255,255,.76);
    color: #45617c;
    border-radius: 999px;
    padding: 8px 12px;
    font-size: 13px;
}
.product-visual {
    position: relative;
    padding: 20px;
    border: 1px solid rgba(213,229,247,.92);
    border-radius: 30px;
    background: linear-gradient(145deg, rgba(255,255,255,.95), rgba(229,242,255,.72));
    box-shadow: var(--shadow);
    overflow: hidden;
}
.product-visual:before {
    content: "";
    position: absolute;
    inset: auto -70px -70px auto;
    width: 190px;
    height: 190px;
    background: rgba(70,139,223,.15);
    border-radius: 50%;
}
.app-card {
    position: relative;
    display: grid;
    place-items: center;
    min-height: 360px;
    border-radius: 26px;
    background: linear-gradient(180deg, #f8fcff, #eaf4ff);
    border: 1px solid rgba(70,139,223,.12);
}
.app-card img {
    max-height: 340px;
    margin: auto;
    filter: drop-shadow(0 24px 36px rgba(51,95,145,.18));
}
.float-card {
    position: relative;
    margin-top: 12px;
    border: 1px solid rgba(70,139,223,.18);
    border-radius: 18px;
    padding: 14px;
    background: rgba(255,255,255,.86);
    box-shadow: 0 10px 28px rgba(32, 92, 155, .08);
}
.float-card strong {
    display: block;
    font-size: 14px;
    color: #153a61;
}
.float-card span {
    color: var(--muted);
    font-size: 13px;
}
.trust-grid, .feature-grid, .category-grid, .scenario-grid, .risk-grid {
    display: grid;
    gap: 16px;
}
.trust-card, .feature-card, .category-card, .scenario-card, .faq-item, .info-card, .doc-card, .risk-item {
    border: 1px solid var(--line);
    background: var(--card);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: 0 10px 30px rgba(57,103,157,.07);
}
.trust-card b, .feature-card h3, .category-card h3, .scenario-card h3, .info-card h3, .doc-card h3, .risk-item h3 {
    display: block;
    margin: 0 0 8px;
    color: #12304f;
}
.trust-card p, .feature-card p, .category-card p, .scenario-card p, .info-card p, .doc-card p, .risk-item p {
    margin: 0;
    color: var(--muted);
}
.card-link {
    display: inline-flex;
    margin-top: 14px;
    color: var(--primary-dark);
    font-weight: 800;
    font-size: 14px;
}
.gradient-panel {
    background: linear-gradient(135deg, #edf7ff 0%, #ffffff 45%, #eef6ff 100%);
    border: 1px solid rgba(70,139,223,.18);
    border-radius: 30px;
    padding: 28px;
    box-shadow: var(--shadow);
}
.security-layout {
    display: grid;
    gap: 22px;
    align-items: start;
}
.security-panel {
    border-radius: 26px;
    padding: 24px;
    background: #fff;
    border: 1px solid var(--line);
}
.security-list {
    display: grid;
    gap: 12px;
    padding: 0;
    margin: 0;
    list-style: none;
}
.security-list li {
    padding: 14px 14px 14px 42px;
    position: relative;
    border-radius: 16px;
    background: #f3f8ff;
    color: #304a66;
}
.security-list li:before {
    content: "✓";
    position: absolute;
    left: 14px;
    top: 13px;
    width: 20px;
    height: 20px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    font-size: 12px;
}
.process-steps, .steps {
    display: grid;
    gap: 14px;
    counter-reset: step;
}
.step-card {
    position: relative;
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 22px;
    background: #fff;
    counter-increment: step;
}
.step-card:before {
    content: counter(step, decimal-leading-zero);
    display: inline-flex;
    margin-bottom: 12px;
    color: var(--primary-dark);
    background: var(--primary-soft);
    border-radius: 999px;
    padding: 4px 10px;
    font-weight: 800;
    font-size: 12px;
}
.step-card h3 {
    margin: 0 0 8px;
}
.step-card p {
    margin: 0;
    color: var(--muted);
}
.faq-list {
    display: grid;
    gap: 14px;
}
.faq-item h3 {
    margin: 0 0 8px;
    font-size: 18px;
}
.faq-item p {
    margin: 0;
    color: var(--muted);
}
.cta-section {
    text-align: center;
    background: linear-gradient(135deg, #e9f4ff, #ffffff 55%, #edf7ff);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}
.cta-section .section-lead {
    margin-left: auto;
    margin-right: auto;
}
.page-hero {
    padding: 54px 0 24px;
}
.page-hero h1 {
    margin: 14px 0;
    font-size: clamp(32px, 6vw, 54px);
    line-height: 1.12;
    letter-spacing: -.04em;
}
.page-hero p {
    max-width: 780px;
    color: var(--muted);
    margin: 0;
}
.doc-layout {
    display: grid;
    gap: 22px;
    align-items: start;
}
.doc-main {
    display: grid;
    gap: 18px;
}
.doc-main p {
    color: var(--muted);
}
.note-box {
    border-left: 4px solid var(--primary);
    background: #eef7ff;
    border-radius: 18px;
    padding: 18px;
    color: #2d4e70;
}
.check-list {
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 10px;
}
.check-list li {
    background: #f5f9ff;
    border: 1px solid var(--line);
    border-radius: 15px;
    padding: 12px 14px;
    color: #354f6b;
}
.action-row {
    padding-top: 8px;
}
.site-footer {
    background: #0f2439;
    color: #dbe9f7;
    padding: 46px 0 20px;
}
.footer-grid {
    display: grid;
    gap: 24px;
}
.footer-brand img {
    width: 34px;
    height: 34px;
    border-radius: 12px;
}
.site-footer h3 {
    margin: 0 0 12px;
    font-size: 16px;
    color: #fff;
}
.site-footer p {
    color: #aebfd2;
    margin: 12px 0 0;
}
.site-footer a {
    display: block;
    margin: 7px 0;
    color: #c8d8e8;
}
.footer-bottom {
    margin-top: 28px;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,.12);
    color: #98abc0;
    font-size: 13px;
}
@media (min-width: 680px) {
    .trust-grid, .feature-grid, .category-grid, .scenario-grid, .risk-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .process-steps, .steps {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .footer-grid {
        grid-template-columns: 1.4fr 1fr 1fr;
    }
}
@media (min-width: 940px) {
    .nav-toggle {
        display: none;
    }
    .site-nav {
        position: static;
        display: flex;
        align-items: center;
        gap: 4px;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
    }
    .hero-banner {
        padding: 78px 0 44px;
    }
    .hero-layout {
        grid-template-columns: 1fr .92fr;
        gap: 44px;
    }
    .product-visual {
        padding: 24px;
    }
    .float-card {
        position: absolute;
        max-width: 220px;
        margin: 0;
    }
    .float-card.one { left: 18px; top: 24px; }
    .float-card.two { right: 18px; top: 72px; }
    .float-card.three { left: 22px; bottom: 28px; }
    .float-card.four { right: 22px; bottom: 44px; }
    .trust-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
    .category-grid, .feature-grid, .scenario-grid, .risk-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .security-layout {
        grid-template-columns: 1fr .82fr;
    }
    .process-steps, .steps {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .doc-layout {
        grid-template-columns: minmax(0, 1fr) 320px;
    }
    .doc-main {
        max-width: 760px;
    }
}