* {
    box-sizing: border-box;
}

:root {
    --primary: rgb(70,139,223);
    --primary-dark: #1d5fb2;
    --primary-soft: #eaf4ff;
    --ink: #132238;
    --muted: #5d6b82;
    --line: #dce8f6;
    --card: #ffffff;
    --bg: #f5f9ff;
    --success: #28a879;
    --warning: #f0a429;
    --shadow: 0 18px 45px rgba(31, 91, 153, 0.10);
    --radius: 22px;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    color: var(--ink);
    line-height: 1.75;
    background:
        radial-gradient(circle at top left, rgba(70,139,223,.16), transparent 32rem),
        linear-gradient(180deg, #f3f8ff 0%, #ffffff 52%, #f7fbff 100%);
    overflow-x: hidden;
}

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

img {
    max-width: 100%;
    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,.84);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(220,232,246,.84);
}

.header-inner {
    min-height: 70px;
    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: .02em;
}

.brand-logo {
    width: 38px;
    height: 38px;
    object-fit: contain;
}

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

.nav-toggle {
    border: 1px solid var(--line);
    background: #fff;
    color: var(--primary-dark);
    border-radius: 999px;
    padding: 8px 14px;
    font-weight: 700;
}

.site-nav {
    display: none;
    position: absolute;
    top: 70px;
    left: 16px;
    right: 16px;
    background: rgba(255,255,255,.98);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
    padding: 12px;
}

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

.site-nav a {
    display: block;
    padding: 11px 12px;
    border-radius: 12px;
    color: #26384f;
    font-weight: 650;
}

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

.section {
    padding: 58px 0;
}

.section-tight {
    padding: 36px 0;
}

.section-title {
    max-width: 760px;
    margin-bottom: 28px;
}

.eyebrow,
.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border: 1px solid rgba(70,139,223,.22);
    background: rgba(70,139,223,.09);
    color: var(--primary-dark);
    border-radius: 999px;
    padding: 6px 11px;
    font-size: 13px;
    font-weight: 800;
}

h1, h2, h3 {
    line-height: 1.25;
    margin: 0 0 14px;
    color: #10213a;
}

h1 {
    font-size: clamp(34px, 9vw, 58px);
    letter-spacing: -.04em;
}

h2 {
    font-size: clamp(26px, 6vw, 38px);
    letter-spacing: -.03em;
}

h3 {
    font-size: 20px;
}

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

.hero {
    padding: 54px 0 34px;
}

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

.hero-copy {
    display: grid;
    gap: 18px;
}

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

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 50px;
    padding: 0 24px;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--primary), #2d78d4);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 12px 28px rgba(70,139,223,.28);
    border: none;
    cursor: pointer;
    transition: transform .2s ease, box-shadow .2s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 34px rgba(70,139,223,.32);
}

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

.hero-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.hero-visual {
    position: relative;
    border-radius: 30px;
    padding: 20px;
    background:
        linear-gradient(145deg, rgba(255,255,255,.86), rgba(234,244,255,.74)),
        radial-gradient(circle at 80% 20%, rgba(70,139,223,.20), transparent 18rem);
    border: 1px solid rgba(255,255,255,.88);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.product-frame {
    width: min(360px, 78vw);
    margin: 0 auto;
    padding: 12px;
    border-radius: 28px;
    background: #fff;
    box-shadow: 0 24px 70px rgba(38, 90, 146, .16);
}

.product-frame img {
    border-radius: 22px;
}

.floating-card {
    background: rgba(255,255,255,.90);
    border: 1px solid rgba(220,232,246,.92);
    border-radius: 18px;
    box-shadow: 0 18px 38px rgba(31, 91, 153, .12);
    padding: 14px;
}

.status-card {
    margin-top: 16px;
    display: grid;
    gap: 8px;
}

.status-line {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    color: var(--muted);
    font-size: 14px;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 99px;
    background: var(--success);
    box-shadow: 0 0 0 6px rgba(40,168,121,.12);
}

.mini-labels {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 14px;
}

.mini-labels span {
    padding: 7px 9px;
    border-radius: 999px;
    background: rgba(70,139,223,.10);
    color: var(--primary-dark);
    font-size: 12px;
    font-weight: 800;
}

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

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

.trust-item,
.category-card,
.feature-card,
.scenario-card,
.info-card,
.faq-item,
.step-card,
.security-card {
    background: rgba(255,255,255,.88);
    border: 1px solid rgba(220,232,246,.92);
    border-radius: var(--radius);
    box-shadow: 0 12px 34px rgba(31, 91, 153, .07);
    padding: 20px;
}

.trust-item strong {
    display: block;
    font-size: 18px;
    color: #142846;
    margin-bottom: 4px;
}

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

.category-card:hover,
.feature-card:hover,
.scenario-card:hover {
    transform: translateY(-3px);
    border-color: rgba(70,139,223,.34);
    box-shadow: 0 18px 45px rgba(31,91,153,.11);
}

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

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

.page-hero {
    padding: 46px 0 28px;
}

.page-hero .panel {
    background:
        linear-gradient(145deg, rgba(255,255,255,.92), rgba(234,244,255,.86));
    border: 1px solid rgba(220,232,246,.92);
    border-radius: 28px;
    padding: 24px;
    box-shadow: var(--shadow);
}

.page-hero p {
    font-size: 16px;
}

.panel {
    background: rgba(255,255,255,.88);
    border: 1px solid rgba(220,232,246,.92);
    border-radius: 28px;
    padding: 24px;
    box-shadow: var(--shadow);
}

.security-panel {
    background:
        linear-gradient(145deg, #ffffff, #edf6ff);
    border: 1px solid rgba(70,139,223,.18);
    border-radius: 28px;
    padding: 24px;
    box-shadow: var(--shadow);
}

.security-row {
    display: flex;
    gap: 12px;
    padding: 14px 0;
    border-bottom: 1px solid var(--line);
}

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

.check {
    width: 24px;
    height: 24px;
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 99px;
    background: rgba(40,168,121,.12);
    color: var(--success);
    font-weight: 900;
}

.steps {
    display: grid;
    gap: 14px;
    counter-reset: step;
}

.step-card {
    position: relative;
    padding-left: 68px;
}

.step-card::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 20px;
    top: 20px;
    width: 34px;
    height: 34px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: #fff;
    font-weight: 900;
}

.note-box {
    border-radius: 22px;
    background: #f1f7ff;
    border: 1px solid rgba(70,139,223,.18);
    padding: 18px;
}

.list-clean {
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 10px;
}

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

.list-clean li::before {
    content: "";
    width: 9px;
    height: 9px;
    border-radius: 99px;
    background: var(--primary);
    position: absolute;
    left: 3px;
    top: .72em;
}

.faq-item summary {
    cursor: pointer;
    font-weight: 850;
    color: #162a48;
}

.faq-item p {
    margin-top: 12px;
}

.cta-section {
    text-align: center;
    border-radius: 30px;
    padding: 34px 22px;
    background:
        linear-gradient(135deg, rgba(70,139,223,.12), rgba(255,255,255,.92)),
        radial-gradient(circle at top right, rgba(70,139,223,.20), transparent 18rem);
    border: 1px solid rgba(70,139,223,.18);
    box-shadow: var(--shadow);
}

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

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

.content-card {
    background: rgba(255,255,255,.90);
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 22px;
}

.kpi-row {
    display: grid;
    gap: 12px;
}

.kpi {
    border-radius: 18px;
    background: #fff;
    border: 1px solid var(--line);
    padding: 16px;
}

.kpi strong {
    display: block;
    color: var(--primary-dark);
    font-size: 22px;
}

.site-footer {
    margin-top: 46px;
    padding: 42px 0 24px;
    background: #10213a;
    color: #fff;
}

.site-footer p,
.site-footer a,
.footer-bottom {
    color: rgba(255,255,255,.70);
}

.footer-grid {
    display: grid;
    gap: 26px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

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

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

.site-footer a {
    display: block;
    margin: 7px 0;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,.12);
    margin-top: 28px;
    padding-top: 18px;
    display: grid;
    gap: 8px;
    font-size: 13px;
}

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

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

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

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

    .site-nav a {
        padding: 8px 12px;
        font-size: 15px;
    }

    .hero {
        padding: 76px 0 48px;
    }

    .hero-layout,
    .split-layout,
    .security-layout,
    .page-hero {
        grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    }

    .category-grid,
    .feature-grid,
    .scenario-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));
    }

    .step-card {
        padding: 70px 20px 20px;
    }

    .step-card::before {
        top: 20px;
        left: 20px;
    }

    .footer-grid {
        grid-template-columns: 1.8fr 1fr 1fr;
    }

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

@media (min-width: 1080px) {
    .floating-card.status-card {
        position: absolute;
        left: 24px;
        bottom: 24px;
        width: 238px;
        margin: 0;
    }

    .mini-labels {
        position: absolute;
        right: 24px;
        top: 24px;
        max-width: 190px;
        justify-content: flex-end;
    }
}