* {
    box-sizing: border-box;
}

:root {
    --primary: rgb(70,139,223);
    --primary-dark: #245fa8;
    --primary-soft: #eaf4ff;
    --ink: #13233a;
    --muted: #5f6f84;
    --line: #dce9f8;
    --card: rgba(255,255,255,.92);
    --bg: #f6fbff;
    --radius: 22px;
    --shadow: 0 18px 46px rgba(32, 93, 160, .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 18% 0%, rgba(70,139,223,.15), transparent 30%),
        linear-gradient(180deg, #f8fcff 0%, #eef7ff 48%, #ffffff 100%);
    line-height: 1.72;
    overflow-x: hidden;
}

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

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

.container {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.86);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(212,228,246,.8);
}

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

.logo,
.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: -.02em;
}

.logo img,
.footer-brand img {
    width: 38px;
    height: 38px;
    border-radius: 12px;
}

.nav-toggle {
    border: 0;
    background: var(--primary-soft);
    color: var(--primary-dark);
    width: 42px;
    height: 42px;
    border-radius: 14px;
    font-size: 22px;
}

.site-nav {
    position: absolute;
    top: 68px;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    gap: 8px;
    padding: 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}

.site-nav.open {
    display: flex;
}

.site-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #41536a;
    font-size: 15px;
}

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

.section {
    padding: 56px 0;
}

.section-title {
    max-width: 760px;
    margin: 0 auto 28px;
    text-align: center;
}

.section-title.left {
    margin-left: 0;
    text-align: left;
}

.eyebrow,
.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-dark);
    background: rgba(70,139,223,.1);
    border: 1px solid rgba(70,139,223,.18);
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
}

h1, h2, h3 {
    line-height: 1.25;
    margin: 0 0 14px;
    letter-spacing: -.03em;
}

h1 {
    font-size: clamp(34px, 9vw, 62px);
}

h2 {
    font-size: clamp(26px, 6vw, 40px);
}

h3 {
    font-size: 20px;
}

p {
    margin: 0 0 14px;
    color: var(--muted);
}

.hero {
    padding: 54px 0 36px;
}

.hero-layout {
    display: grid;
    gap: 30px;
    align-items: center;
}

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

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    margin-top: 24px;
}

.security-tags,
.hero-tags,
.inline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 18px 0;
}

.tag {
    display: inline-flex;
    align-items: center;
    border: 1px solid rgba(70,139,223,.18);
    background: rgba(255,255,255,.72);
    color: #2a5c91;
    padding: 8px 11px;
    border-radius: 999px;
    font-size: 13px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--primary), #67b7ff);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 28px rgba(70,139,223,.26);
    border: 0;
    cursor: pointer;
    transition: transform .2s ease, box-shadow .2s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 18px 34px rgba(70,139,223,.3);
}

.text-link {
    color: var(--primary-dark);
    font-weight: 800;
}

.hero-visual {
    position: relative;
    min-height: 440px;
    border-radius: 32px;
    padding: 22px;
    background:
        linear-gradient(150deg, rgba(70,139,223,.18), rgba(255,255,255,.9)),
        radial-gradient(circle at 80% 20%, rgba(70,139,223,.25), transparent 26%);
    border: 1px solid rgba(70,139,223,.14);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.phone-frame {
    width: min(265px, 76%);
    margin: 14px auto 0;
    padding: 10px;
    border-radius: 34px;
    background: #fff;
    box-shadow: 0 26px 60px rgba(30,74,128,.18);
}

.phone-frame img {
    border-radius: 26px;
    width: 100%;
}

.status-card,
.float-card {
    position: absolute;
    background: rgba(255,255,255,.9);
    border: 1px solid rgba(70,139,223,.16);
    box-shadow: 0 14px 34px rgba(30,74,128,.12);
    border-radius: 20px;
    padding: 14px;
}

.status-card {
    left: 18px;
    bottom: 22px;
    max-width: 215px;
}

.float-card.one {
    right: 16px;
    top: 34px;
}

.float-card.two {
    right: 20px;
    bottom: 95px;
}

.status-dot {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: #35b779;
    display: inline-block;
    margin-right: 6px;
}

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

.trust-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.trust-card,
.category-card,
.feature-card,
.scenario-card,
.info-card,
.faq-item,
.step,
.notice-card,
.article-card {
    background: var(--card);
    border: 1px solid rgba(210,226,245,.82);
    border-radius: var(--radius);
    box-shadow: 0 12px 34px rgba(41, 91, 145, .08);
}

.trust-card {
    padding: 18px;
}

.trust-card strong {
    display: block;
    font-size: 18px;
    margin-bottom: 4px;
}

.category-grid {
    grid-template-columns: 1fr;
}

.category-card,
.feature-card,
.scenario-card,
.article-card {
    padding: 22px;
}

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

.category-card:hover {
    transform: translateY(-3px);
    border-color: rgba(70,139,223,.42);
}

.card-arrow {
    color: var(--primary-dark);
    font-weight: 800;
}

.feature-grid {
    grid-template-columns: 1fr;
}

.feature-icon {
    width: 42px;
    height: 42px;
    border-radius: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
    margin-bottom: 16px;
}

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

.security-panel,
.guide-panel {
    padding: 24px;
    border-radius: 28px;
    background: linear-gradient(145deg, rgba(255,255,255,.92), rgba(232,244,255,.92));
    border: 1px solid rgba(70,139,223,.18);
    box-shadow: var(--shadow);
}

.panel-row {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 0;
    border-bottom: 1px solid rgba(70,139,223,.14);
}

.panel-row:last-child {
    border-bottom: 0;
}

.panel-row span {
    color: var(--muted);
}

.panel-row strong {
    color: var(--primary-dark);
}

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

.step {
    position: relative;
    padding: 22px;
}

.step::before {
    counter-increment: step;
    content: counter(step);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    margin-bottom: 12px;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    font-weight: 900;
}

.cta-section {
    text-align: center;
    padding: 42px 24px;
    border-radius: 32px;
    background:
        radial-gradient(circle at 16% 20%, rgba(70,139,223,.18), transparent 28%),
        linear-gradient(135deg, #eef7ff, #ffffff);
    border: 1px solid rgba(70,139,223,.16);
    box-shadow: var(--shadow);
}

.faq-list {
    display: grid;
    gap: 14px;
}

.faq-item {
    padding: 20px;
}

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

.page-head {
    padding: 48px 0 24px;
}

.page-hero {
    padding: 34px;
    border-radius: 32px;
    background:
        linear-gradient(135deg, rgba(255,255,255,.96), rgba(236,247,255,.95)),
        radial-gradient(circle at 86% 12%, rgba(70,139,223,.18), transparent 24%);
    border: 1px solid rgba(70,139,223,.16);
    box-shadow: var(--shadow);
}

.page-hero h1 {
    font-size: clamp(32px, 7vw, 52px);
}

.article-layout {
    display: grid;
    gap: 22px;
    padding-bottom: 58px;
}

.article-main,
.article-side {
    min-width: 0;
}

.article-main {
    display: grid;
    gap: 18px;
}

.article-card ul,
.notice-card ul,
.info-card ul {
    margin: 10px 0 0;
    padding-left: 20px;
    color: var(--muted);
}

.article-card li,
.notice-card li,
.info-card li {
    margin: 8px 0;
}

.notice-card,
.info-card {
    padding: 22px;
}

.notice-card {
    background: linear-gradient(145deg, #fff, #eef7ff);
}

.download-card {
    padding: 28px;
    text-align: center;
}

.download-layout .security-panel {
    align-self: stretch;
}

.site-footer {
    background: #f3f8fe;
    border-top: 1px solid var(--line);
    padding: 42px 0 22px;
}

.footer-grid {
    grid-template-columns: 1fr;
}

.site-footer h3 {
    font-size: 16px;
}

.site-footer a {
    display: block;
    color: var(--muted);
    margin: 8px 0;
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: 8px;
    color: #718198;
    font-size: 13px;
    border-top: 1px solid rgba(70,139,223,.14);
    margin-top: 28px;
    padding-top: 18px;
}

@media (min-width: 680px) {
    .container {
        width: min(1120px, calc(100% - 48px));
    }

    .category-grid,
    .feature-grid,
    .scenario-grid,
    .article-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .steps {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

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

    .footer-grid {
        grid-template-columns: 1.5fr 1fr 1fr 1fr;
    }
}

@media (min-width: 940px) {
    .nav-toggle {
        display: none;
    }

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

    .site-nav a {
        padding: 9px 12px;
    }

    .hero {
        padding: 82px 0 44px;
    }

    .hero-layout,
    .security-layout,
    .split-layout,
    .download-layout {
        grid-template-columns: 1.05fr .95fr;
    }

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

    .article-layout {
        grid-template-columns: minmax(0, 1fr) 320px;
        align-items: start;
    }

    .article-side {
        position: sticky;
        top: 92px;
    }

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

    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}