* {
    box-sizing: border-box;
}

:root {
    --primary: rgb(70,139,223);
    --primary-dark: rgb(42, 99, 179);
    --primary-soft: rgb(235, 244, 255);
    --ink: #152238;
    --muted: #5f6f86;
    --line: #dce8f7;
    --card: #ffffff;
    --bg: #f7fbff;
    --radius: 22px;
    --shadow: 0 18px 45px rgba(26, 73, 124, 0.11);
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    color: var(--ink);
    background: linear-gradient(180deg, #f6fbff 0%, #ffffff 48%, #f4f9ff 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(100% - 32px, 1160px);
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    border-bottom: 1px solid rgba(220, 232, 247, 0.86);
    backdrop-filter: blur(16px);
}

.header-inner {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

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

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

.brand-text {
    font-size: 18px;
    color: var(--ink);
}

.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;
    align-items: center;
    gap: 5px;
}

.nav-toggle span {
    width: 19px;
    height: 2px;
    border-radius: 2px;
    background: var(--ink);
}

.main-nav {
    position: absolute;
    top: 68px;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: #fff;
    box-shadow: var(--shadow);
}

.main-nav.is-open {
    display: flex;
}

.main-nav a {
    padding: 12px 14px;
    border-radius: 14px;
    color: #31435c;
    font-size: 15px;
}

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

.hero {
    padding: 46px 0 34px;
    background:
        radial-gradient(circle at top left, rgba(70, 139, 223, 0.16), transparent 34%),
        linear-gradient(135deg, #ffffff 0%, #eef6ff 100%);
}

.hero-grid {
    display: grid;
    gap: 32px;
    align-items: center;
}

.eyebrow,
.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(70, 139, 223, 0.1);
    color: var(--primary-dark);
    font-size: 13px;
    font-weight: 700;
}

h1,
h2,
h3 {
    line-height: 1.25;
    margin: 0 0 14px;
    letter-spacing: -0.025em;
}

h1 {
    font-size: clamp(34px, 9vw, 64px);
    margin-top: 16px;
}

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

h3 {
    font-size: 20px;
}

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

.lead {
    font-size: 17px;
    color: #40536f;
}

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

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 50px;
    padding: 0 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 12px 26px rgba(70, 139, 223, 0.26);
    transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    background: var(--primary-dark);
    box-shadow: 0 16px 34px rgba(70, 139, 223, 0.32);
}

.note-inline {
    color: var(--muted);
    font-size: 14px;
}

.trust-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 22px;
}

.trust-list span {
    padding: 8px 12px;
    border: 1px solid rgba(70, 139, 223, 0.2);
    border-radius: 999px;
    color: #34516f;
    background: rgba(255, 255, 255, 0.82);
    font-size: 14px;
}

.device-card {
    position: relative;
    padding: 22px;
    border: 1px solid rgba(70, 139, 223, 0.18);
    border-radius: 30px;
    background: rgba(255, 255, 255, 0.88);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.device-card::before {
    content: "";
    position: absolute;
    width: 190px;
    height: 190px;
    right: -70px;
    top: -70px;
    border-radius: 50%;
    background: rgba(70, 139, 223, 0.14);
}

.app-image {
    position: relative;
    width: min(86%, 360px);
    margin: 0 auto;
    filter: drop-shadow(0 24px 32px rgba(26, 73, 124, 0.16));
}

.security-strip {
    position: relative;
    display: grid;
    gap: 12px;
    margin-top: 18px;
}

.security-strip div,
.stat-card {
    padding: 14px;
    border-radius: 18px;
    background: #f5f9ff;
    border: 1px solid var(--line);
}

.security-strip strong,
.stat-card strong {
    display: block;
    font-size: 19px;
    color: var(--ink);
}

.security-strip span,
.stat-card span {
    color: var(--muted);
    font-size: 13px;
}

.section {
    padding: 52px 0;
}

.section-soft {
    background: linear-gradient(180deg, rgba(238, 246, 255, 0.78), rgba(255, 255, 255, 0.92));
}

.section-head {
    max-width: 760px;
    margin-bottom: 24px;
}

.grid,
.feature-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;
}

.card {
    padding: 22px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--card);
    box-shadow: 0 12px 30px rgba(26, 73, 124, 0.07);
}

.card h2,
.card h3 {
    color: var(--ink);
}

.card-icon {
    width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 15px;
    margin-bottom: 14px;
    color: #fff;
    background: var(--primary);
    font-weight: 800;
}

.two-col {
    display: grid;
    gap: 20px;
}

.info-panel {
    padding: 24px;
    border-radius: 26px;
    background: linear-gradient(135deg, #ffffff, #edf6ff);
    border: 1px solid rgba(70, 139, 223, 0.18);
}

.steps {
    display: grid;
    gap: 14px;
    padding: 0;
    margin: 0;
    list-style: none;
}

.steps li {
    display: grid;
    grid-template-columns: 36px 1fr;
    gap: 12px;
    align-items: start;
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
}

.steps span {
    width: 36px;
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 13px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 800;
}

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

.faq-item {
    padding: 20px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: #fff;
}

.faq-item h2,
.faq-item h3 {
    font-size: 18px;
    margin-bottom: 8px;
}

.page-hero {
    padding: 44px 0 28px;
    background: linear-gradient(135deg, #ffffff 0%, #eef6ff 100%);
    border-bottom: 1px solid rgba(220, 232, 247, 0.8);
}

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

.article-wrap {
    display: grid;
    gap: 20px;
    padding: 34px 0 56px;
}

.article-card {
    padding: 24px;
    border: 1px solid var(--line);
    border-radius: 24px;
    background: #fff;
    box-shadow: 0 12px 30px rgba(26, 73, 124, 0.07);
}

.tip-box {
    padding: 18px;
    border-radius: 20px;
    background: #edf6ff;
    border: 1px solid rgba(70, 139, 223, 0.22);
}

.tip-box strong {
    display: block;
    margin-bottom: 6px;
    color: var(--primary-dark);
}

.cta-panel {
    padding: 26px;
    border-radius: 28px;
    background: linear-gradient(135deg, rgba(70,139,223,0.12), rgba(255,255,255,0.96));
    border: 1px solid rgba(70, 139, 223, 0.2);
}

.cta-panel p {
    max-width: 720px;
}

.table-like {
    display: grid;
    gap: 10px;
}

.table-like div {
    display: grid;
    gap: 6px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: #fff;
}

.table-like strong {
    color: var(--ink);
}

.site-footer {
    padding: 40px 0 24px;
    background: #10233d;
    color: #d8e7fa;
}

.site-footer p,
.site-footer a {
    color: #b8c8dc;
}

.footer-grid {
    display: grid;
    gap: 24px;
}

.footer-brand .brand-text {
    color: #fff;
}

.site-footer h2 {
    font-size: 16px;
    margin-bottom: 12px;
    color: #fff;
}

.site-footer a {
    display: block;
    margin: 8px 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: 700px) {
    .container {
        width: min(100% - 56px, 1160px);
    }

    .hero {
        padding: 66px 0 52px;
    }

    .hero-grid,
    .two-col {
        grid-template-columns: 1.05fr .95fr;
    }

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

    .security-strip {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .article-card,
    .cta-panel {
        padding: 32px;
    }

    .footer-grid {
        grid-template-columns: 1.4fr repeat(3, 1fr);
    }
}

@media (min-width: 980px) {
    .nav-toggle {
        display: none;
    }

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

    .main-nav a {
        padding: 9px 12px;
        font-size: 14px;
    }

    .hero-grid {
        grid-template-columns: 1.08fr .92fr;
        gap: 54px;
    }

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

    .section {
        padding: 72px 0;
    }

    .article-wrap {
        max-width: 960px;
        margin: 0 auto;
        padding: 48px 0 76px;
    }

    .table-like div {
        grid-template-columns: 220px 1fr;
        align-items: center;
    }
}