:root {
    --primary: rgb(70,139,223);
    --primary-dark: #2567b8;
    --primary-soft: #eaf4ff;
    --ink: #14213d;
    --muted: #5f7087;
    --line: #dbe8f6;
    --surface: #ffffff;
    --surface-blue: #f4f9ff;
    --shadow: 0 18px 45px rgba(29, 91, 162, 0.12);
    --radius-lg: 24px;
    --radius-md: 18px;
    --radius-sm: 14px;
}

* {
    box-sizing: border-box;
}

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: 1.72;
    overflow-x: hidden;
}

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

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

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(219, 232, 246, 0.9);
}

.nav-shell {
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    position: relative;
}

.brand,
.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: #12355d;
}

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

.brand-text {
    letter-spacing: 0.04em;
}

.nav-toggle {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.nav-toggle-label {
    width: 44px;
    height: 44px;
    border: 1px solid var(--line);
    border-radius: 14px;
    display: grid;
    place-content: center;
    gap: 5px;
    background: white;
    cursor: pointer;
}

.nav-toggle-label span {
    display: block;
    width: 20px;
    height: 2px;
    border-radius: 10px;
    background: var(--ink);
}

.site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 8px);
    display: none;
    padding: 12px;
    background: rgba(255, 255, 255, 0.98);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}

.nav-toggle:checked ~ .site-nav {
    display: grid;
}

.site-nav a {
    padding: 12px 14px;
    border-radius: 12px;
    color: #27415f;
    font-weight: 650;
}

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

.section {
    padding: 54px 0;
}

.section-tight {
    padding: 34px 0;
}

.hero-section {
    padding: 48px 0 36px;
    background:
        radial-gradient(circle at 18% 15%, rgba(70,139,223,0.18), transparent 36%),
        radial-gradient(circle at 82% 8%, rgba(129,190,255,0.24), transparent 36%),
        linear-gradient(135deg, #f4f9ff 0%, #ffffff 55%, #eaf4ff 100%);
}

.hero-layout {
    display: grid;
    gap: 34px;
    align-items: center;
}

.hero-copy h1,
.page-hero h1 {
    margin: 16px 0;
    font-size: clamp(2.05rem, 8vw, 4.45rem);
    line-height: 1.08;
    letter-spacing: -0.04em;
    color: #102544;
}

.hero-copy p,
.page-hero p,
.section-head p,
.rich-copy p,
.page-content p {
    color: var(--muted);
    font-size: 1.02rem;
}

.badge-row,
.tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 18px 0 24px;
}

.badge,
.tag,
.category-badge {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(70,139,223,0.1);
    color: var(--primary-dark);
    font-weight: 700;
    font-size: 0.9rem;
}

.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) 0%, #2d7ed7 100%);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 28px 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 34px rgba(70,139,223,0.35);
}

.hero-visual {
    position: relative;
    min-height: 420px;
    display: grid;
    place-items: center;
}

.product-orbit {
    position: relative;
    width: min(100%, 380px);
    padding: 22px;
    border-radius: 34px;
    background: rgba(255,255,255,0.72);
    border: 1px solid rgba(219,232,246,0.9);
    box-shadow: var(--shadow);
}

.product-image-card {
    padding: 18px;
    border-radius: 30px;
    background: linear-gradient(180deg, #ffffff, #eef7ff);
}

.product-image-card img {
    margin-inline: auto;
    border-radius: 24px;
}

.float-card {
    position: absolute;
    background: rgba(255,255,255,0.94);
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 14px 16px;
    box-shadow: 0 14px 34px rgba(29,91,162,0.14);
    font-size: 0.9rem;
}

.float-card strong {
    display: block;
    color: #15345f;
    margin-bottom: 2px;
}

.float-card small {
    color: var(--muted);
}

.float-card.status {
    left: 0;
    top: 20px;
}

.float-card.local {
    right: 0;
    top: 98px;
}

.float-card.verify {
    left: 8px;
    bottom: 86px;
}

.float-card.protect {
    right: 12px;
    bottom: 28px;
}

.dot {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    display: inline-block;
    background: #2eb872;
    margin-right: 7px;
}

.trust-strip {
    display: grid;
    gap: 14px;
    margin-top: 28px;
}

.trust-item,
.info-card,
.category-card,
.feature-card,
.scenario-card,
.faq-item,
.step-card,
.note-card,
.timeline-card,
.guide-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    box-shadow: 0 12px 32px rgba(29, 91, 162, 0.08);
}

.trust-item {
    padding: 18px;
}

.trust-item strong {
    display: block;
    margin-bottom: 4px;
    color: #16375f;
}

.trust-item span {
    color: var(--muted);
    font-size: 0.93rem;
}

.section-head {
    margin-bottom: 26px;
    max-width: 760px;
}

.section-head.center {
    margin-inline: auto;
    text-align: center;
}

.section-kicker {
    color: var(--primary-dark);
    font-weight: 800;
    letter-spacing: 0.06em;
    font-size: 0.86rem;
}

h2 {
    margin: 8px 0 10px;
    font-size: clamp(1.65rem, 5vw, 2.55rem);
    line-height: 1.18;
    letter-spacing: -0.03em;
}

h3 {
    margin: 0 0 10px;
    line-height: 1.32;
}

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

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

.category-card {
    position: relative;
    overflow: hidden;
}

.category-card::after {
    content: "";
    position: absolute;
    width: 120px;
    height: 120px;
    right: -50px;
    top: -46px;
    border-radius: 50%;
    background: rgba(70,139,223,0.12);
}

.category-card p,
.feature-card p,
.scenario-card p,
.step-card p,
.info-card p,
.guide-card p,
.note-card p,
.timeline-card p {
    color: var(--muted);
    margin: 0;
}

.card-link {
    display: inline-flex;
    margin-top: 16px;
    color: var(--primary-dark);
    font-weight: 800;
}

.icon-pill {
    width: 44px;
    height: 44px;
    display: grid;
    place-content: center;
    border-radius: 14px;
    margin-bottom: 16px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
}

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

.rich-copy {
    padding: 24px;
    border-radius: var(--radius-lg);
    background: linear-gradient(180deg, #ffffff, #f6fbff);
    border: 1px solid var(--line);
}

.security-panel {
    padding: 24px;
    border-radius: 28px;
    background:
        linear-gradient(135deg, rgba(70,139,223,0.12), rgba(255,255,255,0.88)),
        #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.security-panel-list {
    display: grid;
    gap: 12px;
    margin-top: 18px;
}

.security-panel-list div {
    padding: 15px;
    border-radius: 16px;
    background: rgba(255,255,255,0.82);
    border: 1px solid rgba(219,232,246,0.88);
}

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

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

.step-card::before {
    counter-increment: step;
    content: counter(step, decimal-leading-zero);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 14px;
    background: var(--primary);
    color: white;
    font-weight: 900;
    margin-bottom: 16px;
}

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

.faq-item {
    padding: 20px;
}

.faq-item p {
    margin: 8px 0 0;
    color: var(--muted);
}

.cta-section {
    margin: 30px 0 64px;
}

.cta-panel {
    padding: 34px 22px;
    text-align: center;
    border-radius: 30px;
    background:
        radial-gradient(circle at 15% 20%, rgba(70,139,223,0.18), transparent 28%),
        linear-gradient(135deg, #eef7ff 0%, #ffffff 100%);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.cta-panel p {
    color: var(--muted);
    max-width: 720px;
    margin: 0 auto 22px;
}

.page-hero {
    padding: 48px 0 28px;
    background:
        radial-gradient(circle at 20% 10%, rgba(70,139,223,0.18), transparent 34%),
        linear-gradient(180deg, #f4f9ff 0%, #fff 100%);
}

.page-hero-inner {
    max-width: 860px;
}

.page-content {
    padding: 34px 0 58px;
}

.content-card {
    background: white;
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 24px;
    box-shadow: var(--shadow);
}

.list-clean {
    padding-left: 0;
    margin: 16px 0 0;
    display: grid;
    gap: 12px;
    list-style: none;
}

.list-clean li {
    position: relative;
    padding-left: 28px;
    color: var(--muted);
}

.list-clean li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 11px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--primary);
}

.note-card {
    padding: 20px;
    background: #f6fbff;
}

.timeline {
    display: grid;
    gap: 14px;
}

.timeline-card {
    padding: 20px;
    border-left: 4px solid var(--primary);
}

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

.site-footer {
    background: #f1f7ff;
    border-top: 1px solid var(--line);
    padding: 42px 0 20px;
}

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

.footer-brand img {
    width: 34px;
    height: 34px;
    border-radius: 10px;
}

.site-footer p,
.footer-bottom {
    color: var(--muted);
}

.site-footer h3 {
    font-size: 1rem;
    color: #183456;
}

.site-footer a:not(.footer-brand) {
    display: block;
    color: #4b6178;
    margin: 8px 0;
}

.footer-bottom {
    margin-top: 30px;
    padding-top: 18px;
    border-top: 1px solid var(--line);
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 0.9rem;
}

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

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

    .content-card {
        padding: 32px;
    }
}

@media (min-width: 900px) {
    .nav-toggle-label {
        display: none;
    }

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

    .site-nav a {
        font-size: 0.95rem;
    }

    .hero-layout,
    .split-layout,
    .security-layout,
    .page-layout {
        grid-template-columns: 1.05fr 0.95fr;
    }

    .hero-section {
        padding: 78px 0 44px;
    }

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

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

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

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

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

    .section {
        padding: 76px 0;
    }

    .page-hero {
        padding: 72px 0 42px;
    }
}