:root {
    --primary: rgb(70,139,223);
    --primary-dark: #1f5fae;
    --primary-soft: #eaf4ff;
    --blue-50: #f5f9ff;
    --blue-100: #eef6ff;
    --slate: #253247;
    --muted: #66758d;
    --line: #dce8f6;
    --card: rgba(255, 255, 255, 0.92);
    --shadow: 0 18px 50px rgba(31, 95, 174, 0.11);
    --radius: 22px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    color: var(--slate);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    background: linear-gradient(180deg, #f5f9ff 0%, #ffffff 36%, #f7fbff 100%);
    line-height: 1.72;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
p { margin: 0 0 16px; color: var(--muted); }
h1, h2, h3 { margin: 0; line-height: 1.25; color: #13233a; }
ul, ol { color: var(--muted); padding-left: 20px; }

.container {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255, 255, 255, 0.88);
    border-bottom: 1px solid rgba(220, 232, 246, 0.86);
    backdrop-filter: blur(16px);
}
.header-inner {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
}
.brand, .footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: #14253d;
}
.brand-logo { width: 40px; height: 40px; border-radius: 12px; }
.footer-logo { width: 34px; height: 34px; border-radius: 10px; }
.brand-text { letter-spacing: .2px; }
.nav-toggle {
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fff;
    color: var(--primary-dark);
    font-size: 22px;
    cursor: pointer;
}
.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 74px;
    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: #405069;
    font-size: 15px;
}
.site-nav a.active,
.site-nav a:hover {
    color: var(--primary-dark);
    background: var(--primary-soft);
}

.hero {
    position: relative;
    padding: 54px 0 34px;
    background:
        radial-gradient(circle at 16% 12%, rgba(70,139,223,.18), transparent 28%),
        linear-gradient(135deg, #f8fbff 0%, #e9f4ff 48%, #ffffff 100%);
    overflow: hidden;
}
.hero::after {
    content: "";
    position: absolute;
    right: -90px;
    top: 40px;
    width: 280px;
    height: 280px;
    background: rgba(70,139,223,.11);
    border-radius: 50%;
    filter: blur(10px);
}
.hero-layout {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 30px;
    align-items: center;
}
.eyebrow, .page-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border: 1px solid rgba(70,139,223,.22);
    border-radius: 999px;
    background: rgba(255,255,255,.82);
    color: var(--primary-dark);
    font-size: 13px;
    font-weight: 700;
}
.hero h1, .page-hero h1 {
    margin-top: 18px;
    font-size: clamp(34px, 9vw, 58px);
    letter-spacing: -1.3px;
}
.hero-lead, .page-lead {
    margin-top: 18px;
    font-size: 17px;
    color: #52637a;
}
.hero-tags, .tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 22px 0;
}
.tag, .mini-tag {
    display: inline-flex;
    align-items: center;
    padding: 8px 12px;
    border-radius: 999px;
    background: #fff;
    border: 1px solid var(--line);
    color: #52637a;
    font-size: 13px;
    font-weight: 650;
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 22px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    letter-spacing: .2px;
    box-shadow: 0 12px 30px rgba(70,139,223,.28);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.download-btn:hover {
    transform: translateY(-2px);
    background: var(--primary-dark);
    box-shadow: 0 16px 34px rgba(70,139,223,.34);
}
.hero-visual {
    position: relative;
    min-height: 420px;
    display: grid;
    place-items: center;
}
.phone-card {
    position: relative;
    width: min(320px, 86vw);
    padding: 18px;
    border-radius: 32px;
    background: linear-gradient(180deg, rgba(255,255,255,.94), rgba(235,246,255,.92));
    border: 1px solid rgba(255,255,255,.86);
    box-shadow: var(--shadow);
}
.phone-card img {
    width: 100%;
    border-radius: 24px;
}
.float-card, .status-card {
    position: absolute;
    background: rgba(255,255,255,.92);
    border: 1px solid rgba(220,232,246,.9);
    border-radius: 18px;
    box-shadow: 0 14px 38px rgba(31, 95, 174, .12);
    padding: 12px 14px;
    color: #405069;
    font-size: 13px;
    font-weight: 750;
}
.status-card { top: 18px; left: 0; }
.float-card.local { right: 0; top: 86px; }
.float-card.verify { left: 8px; bottom: 74px; }
.float-card.protect { right: 4px; bottom: 24px; }
.status-dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    margin-right: 7px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 0 5px rgba(70,139,223,.16);
}

.section { padding: 56px 0; }
.section-title {
    max-width: 760px;
    margin-bottom: 26px;
}
.section-title.center { text-align: center; margin-left: auto; margin-right: auto; }
.section-title h2 { font-size: clamp(26px, 5vw, 38px); margin-bottom: 12px; }
.section-title p { font-size: 16px; }
.trust-grid, .feature-grid, .category-grid, .scenario-grid, .faq-grid, .info-grid, .article-grid {
    display: grid;
    gap: 16px;
}
.trust-card, .feature-card, .category-card, .scenario-card, .faq-item, .info-card, .article-card, .tip-card, .step-card {
    background: var(--card);
    border: 1px solid rgba(220, 232, 246, .95);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: 0 10px 30px rgba(31, 95, 174, 0.07);
}
.trust-card strong, .feature-card h3, .category-card h3, .scenario-card h3, .info-card h3, .article-card h3, .tip-card h3, .step-card h3 {
    display: block;
    margin-bottom: 8px;
    color: #172942;
}
.trust-card span {
    display: inline-flex;
    width: 38px;
    height: 38px;
    align-items: center;
    justify-content: center;
    margin-bottom: 10px;
    border-radius: 14px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
}
.category-card {
    position: relative;
    overflow: hidden;
    min-height: 174px;
}
.category-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--primary);
}
.category-card a, .text-link {
    display: inline-flex;
    margin-top: 8px;
    color: var(--primary-dark);
    font-weight: 800;
}
.category-card:hover, .feature-card:hover, .scenario-card:hover {
    transform: translateY(-2px);
    transition: transform .2s ease;
}
.split-layout, .security-layout, .download-layout, .about-layout {
    display: grid;
    gap: 24px;
    align-items: center;
}
.panel {
    padding: 26px;
    border-radius: 28px;
    background: linear-gradient(135deg, #fff, #eef7ff);
    border: 1px solid rgba(220, 232, 246, .95);
    box-shadow: var(--shadow);
}
.security-list {
    display: grid;
    gap: 12px;
    margin-top: 18px;
}
.security-list div {
    padding: 14px;
    border-radius: 16px;
    background: rgba(255,255,255,.76);
    border: 1px solid var(--line);
}
.steps {
    display: grid;
    gap: 14px;
    counter-reset: step;
}
.step-card { position: relative; }
.step-card::before {
    counter-increment: step;
    content: counter(step);
    display: inline-flex;
    width: 34px;
    height: 34px;
    align-items: center;
    justify-content: center;
    margin-bottom: 12px;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    font-weight: 900;
}
.cta-section {
    text-align: center;
    border-radius: 32px;
    padding: 36px 22px;
    background: radial-gradient(circle at top left, rgba(70,139,223,.18), transparent 34%), linear-gradient(135deg, #eef7ff, #ffffff);
    border: 1px solid rgba(220, 232, 246, .95);
    box-shadow: var(--shadow);
}
.cta-section p { max-width: 720px; margin-left: auto; margin-right: auto; }
.cta-section .download-btn { margin-top: 10px; }
.page-hero {
    padding: 48px 0 30px;
    background: linear-gradient(135deg, #f9fcff 0%, #edf7ff 100%);
    border-bottom: 1px solid rgba(220,232,246,.86);
}
.page-hero .container { max-width: 930px; }
.article-section { padding: 42px 0 60px; }
.article-content {
    display: grid;
    gap: 22px;
}
.article-block {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 24px;
    box-shadow: 0 10px 32px rgba(31,95,174,.06);
}
.article-block h2 { margin-bottom: 12px; font-size: 24px; }
.note-box {
    padding: 18px;
    border-radius: 20px;
    background: #f1f8ff;
    border: 1px solid rgba(70,139,223,.22);
    color: #405069;
}
.download-panel {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding: 24px;
    border-radius: 26px;
    background: linear-gradient(135deg, #ffffff, #eef7ff);
    border: 1px solid var(--line);
}
.faq-item h3 { font-size: 18px; margin-bottom: 8px; }
.faq-list { display: grid; gap: 14px; }
.site-footer {
    padding: 42px 0 26px;
    background: #f0f6fd;
    border-top: 1px solid var(--line);
}
.footer-grid {
    display: grid;
    gap: 24px;
}
.footer-grid h2 {
    font-size: 16px;
    margin-bottom: 10px;
}
.footer-grid a {
    display: block;
    margin: 8px 0;
    color: #52637a;
}
.footer-grid a:hover { color: var(--primary-dark); }
.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 28px;
    padding-top: 18px;
    border-top: 1px solid rgba(193,211,234,.9);
    color: #6c7b91;
    font-size: 13px;
}

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

@media (min-width: 900px) {
    .container { width: min(1120px, calc(100% - 56px)); }
    .nav-toggle { display: none; }
    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
        gap: 4px;
    }
    .site-nav a { padding: 9px 12px; }
    .hero { padding: 78px 0 58px; }
    .hero-layout { grid-template-columns: 1.05fr .95fr; gap: 48px; }
    .hero-visual { min-height: 520px; }
    .phone-card { width: 360px; }
    .trust-grid { grid-template-columns: repeat(4, 1fr); }
    .category-grid, .feature-grid, .scenario-grid { grid-template-columns: repeat(3, 1fr); }
    .split-layout, .security-layout, .download-layout, .about-layout { grid-template-columns: 1fr 1fr; gap: 42px; }
    .steps { grid-template-columns: repeat(4, 1fr); }
    .faq-grid { grid-template-columns: 1fr 1fr; }
    .article-content.two-col { grid-template-columns: 1.35fr .65fr; align-items: start; }
    .footer-grid { grid-template-columns: 1.5fr .8fr .8fr; }
    .footer-bottom { flex-direction: row; justify-content: space-between; }
}

@media (min-width: 1100px) {
    .hero h1 { font-size: 60px; }
    .page-hero h1 { font-size: 46px; }
}