* {
    box-sizing: border-box;
}

:root {
    --primary: rgb(70,139,223);
    --primary-dark: #245fbd;
    --primary-soft: #edf6ff;
    --ink: #12233d;
    --muted: #62718a;
    --line: #dce8f7;
    --card: rgba(255,255,255,0.92);
    --bg: #f6faff;
    --radius: 22px;
    --shadow: 0 18px 50px rgba(45, 99, 168, 0.12);
}

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: linear-gradient(180deg, #f4f9ff 0%, #ffffff 42%, #f7fbff 100%);
    line-height: 1.75;
    overflow-x: hidden;
}

img {
    max-width: 100%;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

.container {
    width: min(100% - 32px, 1160px);
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,0.88);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(210, 226, 246, 0.85);
}

.nav-wrap {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: 0.02em;
}

.logo {
    width: 38px;
    height: 38px;
    border-radius: 12px;
}

.brand-text {
    font-size: 18px;
}

.nav-toggle {
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 12px;
    width: 42px;
    height: 42px;
    font-size: 21px;
    color: var(--ink);
}

.main-nav {
    display: none;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 76px;
    padding: 12px;
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 18px;
    box-shadow: var(--shadow);
}

.main-nav.open {
    display: grid;
    gap: 6px;
}

.main-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #3d4f6d;
    font-size: 15px;
}

.main-nav a.active,
.main-nav a:hover {
    color: var(--primary-dark);
    background: var(--primary-soft);
}

.hero {
    padding: 44px 0 34px;
    background:
        radial-gradient(circle at 16% 10%, rgba(70,139,223,0.18), transparent 34%),
        radial-gradient(circle at 88% 16%, rgba(142,191,250,0.2), transparent 35%);
}

.hero-layout {
    display: grid;
    gap: 28px;
    align-items: center;
}

.eyebrow,
.badge {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    gap: 6px;
    padding: 7px 12px;
    border-radius: 999px;
    color: var(--primary-dark);
    background: rgba(70,139,223,0.11);
    border: 1px solid rgba(70,139,223,0.18);
    font-weight: 700;
    font-size: 13px;
}

h1,
h2,
h3 {
    margin: 0 0 14px;
    line-height: 1.22;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(32px, 8vw, 58px);
}

h2 {
    font-size: clamp(25px, 5vw, 38px);
}

h3 {
    font-size: 20px;
}

p {
    margin: 0 0 16px;
    color: var(--muted);
}

.hero p {
    font-size: 17px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    margin-top: 22px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 26px;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--primary), #3c7edb);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 30px rgba(70,139,223,0.28);
    border: 0;
    cursor: pointer;
    transition: transform .2s ease, box-shadow .2s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 18px 36px rgba(70,139,223,0.32);
}

.security-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 18px;
}

.security-tags span,
.tag {
    display: inline-flex;
    padding: 6px 10px;
    border-radius: 999px;
    background: #fff;
    border: 1px solid var(--line);
    color: #42536f;
    font-size: 13px;
}

.product-stage {
    position: relative;
    min-height: 440px;
    padding: 24px;
    border-radius: 30px;
    background: linear-gradient(150deg, rgba(255,255,255,0.92), rgba(233,244,255,0.82));
    border: 1px solid rgba(197,219,246,0.9);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.product-stage::before {
    content: "";
    position: absolute;
    inset: auto -60px -80px auto;
    width: 230px;
    height: 230px;
    border-radius: 50%;
    background: rgba(70,139,223,0.18);
}

.app-visual {
    width: min(320px, 82%);
    margin: 0 auto;
    position: relative;
    z-index: 1;
    filter: drop-shadow(0 22px 32px rgba(38,78,128,0.18));
}

.status-card,
.float-card {
    position: absolute;
    z-index: 2;
    background: rgba(255,255,255,0.94);
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 13px 15px;
    box-shadow: 0 15px 35px rgba(35,79,135,0.12);
}

.status-card {
    left: 18px;
    top: 26px;
}

.status-card strong,
.float-card strong {
    display: block;
    color: var(--ink);
    font-size: 15px;
}

.status-card span,
.float-card span {
    color: var(--muted);
    font-size: 12px;
}

.float-card.one {
    right: 14px;
    top: 125px;
}

.float-card.two {
    left: 20px;
    bottom: 46px;
}

.float-card.three {
    right: 22px;
    bottom: 24px;
}

.section {
    padding: 54px 0;
}

.section-head {
    max-width: 740px;
    margin-bottom: 26px;
}

.center {
    text-align: center;
    margin-left: auto;
    margin-right: auto;
}

.trust-grid,
.category-grid,
.feature-grid,
.scenario-grid,
.info-grid,
.article-grid,
.faq-grid {
    display: grid;
    gap: 16px;
}

.trust-card,
.category-card,
.feature-card,
.scenario-card,
.info-card,
.article-card,
.faq-item,
.step,
.notice-panel,
.content-panel {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: 0 12px 34px rgba(43, 86, 142, 0.08);
}

.trust-card strong {
    display: block;
    font-size: 18px;
    margin-bottom: 6px;
}

.category-card {
    transition: transform .2s ease, border-color .2s ease;
}

.category-card:hover {
    transform: translateY(-3px);
    border-color: rgba(70,139,223,0.45);
}

.card-link {
    display: inline-flex;
    margin-top: 10px;
    color: var(--primary-dark);
    font-weight: 800;
}

.icon-dot {
    width: 38px;
    height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 12px;
    border-radius: 14px;
    background: linear-gradient(135deg, rgba(70,139,223,0.15), rgba(70,139,223,0.05));
    color: var(--primary-dark);
    font-weight: 900;
}

.split-layout,
.security-layout,
.article-layout {
    display: grid;
    gap: 24px;
    align-items: center;
}

.security-panel {
    border-radius: 28px;
    padding: 24px;
    background: linear-gradient(145deg, #ffffff, #edf6ff);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.security-list,
.clean-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 12px;
}

.security-list li,
.clean-list li {
    padding: 13px 14px;
    border-radius: 14px;
    background: rgba(255,255,255,0.72);
    border: 1px solid rgba(209,225,244,0.8);
    color: #40506a;
}

.steps {
    display: grid;
    gap: 16px;
    counter-reset: step;
}

.step {
    position: relative;
}

.step::before {
    counter-increment: step;
    content: counter(step);
    display: inline-flex;
    width: 32px;
    height: 32px;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    margin-bottom: 14px;
}

.cta-section {
    text-align: center;
    border-radius: 30px;
    padding: 36px 20px;
    background:
        radial-gradient(circle at 18% 20%, rgba(70,139,223,0.16), transparent 32%),
        linear-gradient(135deg, #edf6ff, #ffffff);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.page-hero {
    padding: 42px 0 28px;
    background:
        radial-gradient(circle at top left, rgba(70,139,223,0.14), transparent 34%),
        linear-gradient(180deg, #f4f9ff, #fff);
}

.page-hero .container {
    max-width: 920px;
}

.page-hero h1 {
    font-size: clamp(30px, 7vw, 48px);
    margin-top: 12px;
}

.article-body {
    display: grid;
    gap: 22px;
}

.article-body h2 {
    font-size: 26px;
}

.article-body p {
    font-size: 16px;
}

.notice-panel {
    background: linear-gradient(145deg, #ffffff, #f0f7ff);
}

.notice-panel strong {
    display: block;
    margin-bottom: 8px;
}

.faq-item h3 {
    font-size: 18px;
}

.download-single {
    margin-top: 24px;
}

.site-footer {
    margin-top: 44px;
    padding: 44px 0 20px;
    background: #10243d;
    color: #dbe8fa;
}

.footer-grid {
    display: grid;
    gap: 22px;
}

.footer-grid p,
.footer-bottom {
    color: #aebed4;
}

.footer-brand {
    font-size: 20px;
    font-weight: 900;
    margin-bottom: 10px;
}

.footer-grid h3 {
    font-size: 16px;
    margin-bottom: 10px;
    color: #fff;
}

.footer-grid a {
    display: block;
    color: #c8d8ed;
    margin: 6px 0;
    font-size: 14px;
}

.footer-bottom {
    margin-top: 26px;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,0.12);
    font-size: 13px;
}

@media (min-width: 640px) {
    .category-grid,
    .feature-grid,
    .scenario-grid,
    .info-grid,
    .faq-grid,
    .trust-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (min-width: 900px) {
    .container {
        width: min(100% - 56px, 1160px);
    }

    .nav-toggle {
        display: none;
    }

    .main-nav {
        display: flex;
        position: static;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
        gap: 4px;
        align-items: center;
    }

    .main-nav a {
        padding: 8px 12px;
    }

    .hero {
        padding: 78px 0 58px;
    }

    .hero-layout,
    .split-layout,
    .security-layout,
    .article-layout {
        grid-template-columns: 1.02fr .98fr;
    }

    .category-grid,
    .feature-grid,
    .scenario-grid,
    .article-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .trust-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .steps {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .footer-grid {
        grid-template-columns: 1.4fr .8fr .8fr .8fr;
    }

    .section {
        padding: 70px 0;
    }
}

@media (min-width: 1120px) {
    .product-stage {
        min-height: 500px;
    }
}