* {
    box-sizing: border-box;
}

:root {
    --primary: rgb(70,139,223);
    --primary-dark: #1f5fae;
    --primary-soft: #edf6ff;
    --primary-soft-2: #f6fbff;
    --text: #162236;
    --muted: #65758b;
    --line: #dce9f7;
    --card: rgba(255,255,255,.86);
    --shadow: 0 18px 45px rgba(34, 93, 160, .12);
    --radius: 22px;
    --radius-sm: 16px;
    --container: 1160px;
}

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(--text);
    background:
        radial-gradient(circle at top left, rgba(70,139,223,.16), transparent 34rem),
        linear-gradient(180deg, #f7fbff 0%, #fff 38%, #f8fbff 100%);
    line-height: 1.75;
    overflow-x: hidden;
}

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

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

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,.88);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(215,230,247,.88);
}

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

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

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

.brand-text {
    font-size: 22px;
    color: #12315c;
}

.nav-toggle {
    width: 44px;
    height: 44px;
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 14px;
    display: inline-flex;
    flex-direction: column;
    gap: 5px;
    justify-content: center;
    align-items: center;
    cursor: pointer;
}

.nav-toggle span {
    width: 18px;
    height: 2px;
    background: #1d3d69;
    border-radius: 999px;
}

.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: rgba(255,255,255,.96);
    box-shadow: var(--shadow);
}

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

.site-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #41536c;
    font-weight: 600;
    font-size: 15px;
}

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

.hero {
    padding: 42px 0 34px;
}

.hero-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    align-items: center;
}

.kicker,
.badge {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    gap: 8px;
    border: 1px solid rgba(70,139,223,.2);
    color: var(--primary-dark);
    background: rgba(255,255,255,.72);
    border-radius: 999px;
    padding: 7px 12px;
    font-size: 13px;
    font-weight: 700;
}

h1,
h2,
h3 {
    color: #112747;
    line-height: 1.25;
    margin: 0 0 14px;
}

h1 {
    font-size: clamp(34px, 8vw, 64px);
    letter-spacing: -.05em;
}

h2 {
    font-size: clamp(26px, 5vw, 40px);
    letter-spacing: -.035em;
}

h3 {
    font-size: 20px;
}

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

.hero-copy .lead {
    font-size: 17px;
    color: #40536e;
    max-width: 640px;
}

.hero-actions,
.inline-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
    margin-top: 24px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 28px rgba(70,139,223,.28);
    border: 1px solid rgba(70,139,223,.08);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    background: #3d82d7;
    box-shadow: 0 18px 34px rgba(70,139,223,.34);
}

.text-link {
    color: var(--primary-dark);
    font-weight: 700;
}

.trust-tags,
.tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 20px;
}

.trust-tags span,
.tag-row span,
.soft-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    border-radius: 999px;
    background: #fff;
    border: 1px solid var(--line);
    color: #38506d;
    font-size: 13px;
    font-weight: 700;
}

.hero-visual {
    position: relative;
    min-height: 500px;
}

.phone-card {
    position: relative;
    width: min(82vw, 330px);
    margin: 0 auto;
    padding: 14px;
    border-radius: 34px;
    background: linear-gradient(145deg, rgba(255,255,255,.98), rgba(238,247,255,.78));
    box-shadow: var(--shadow);
    border: 1px solid rgba(255,255,255,.78);
}

.phone-card img {
    border-radius: 26px;
    border: 1px solid rgba(70,139,223,.14);
}

.float-card {
    position: absolute;
    background: rgba(255,255,255,.9);
    border: 1px solid rgba(214,229,246,.92);
    box-shadow: var(--shadow);
    border-radius: 18px;
    padding: 14px;
    min-width: 168px;
}

.float-card strong {
    display: block;
    color: #13335c;
}

.float-card span {
    display: block;
    color: var(--muted);
    font-size: 13px;
}

.status-card {
    top: 16px;
    left: 0;
}

.asset-card {
    bottom: 28px;
    left: 4px;
}

.risk-card {
    right: 0;
    top: 46%;
}

.panel-dots {
    display: flex;
    gap: 7px;
    margin-bottom: 10px;
}

.panel-dots i {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary);
    opacity: .42;
}

.asset-value {
    display: block;
    margin-top: 6px;
    font-size: 20px;
    font-weight: 900;
    color: var(--primary-dark);
}

.section {
    padding: 54px 0;
}

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

.section-header.center {
    text-align: center;
    margin-left: auto;
    margin-right: auto;
}

.metric-strip {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 16px;
    border-radius: var(--radius);
    background: linear-gradient(135deg, rgba(70,139,223,.12), rgba(255,255,255,.88));
    border: 1px solid rgba(70,139,223,.14);
}

.metric-item {
    padding: 16px;
    background: rgba(255,255,255,.78);
    border: 1px solid rgba(218,231,246,.86);
    border-radius: 18px;
}

.metric-item strong {
    display: block;
    font-size: 18px;
    color: #17345b;
}

.metric-item span {
    color: var(--muted);
    font-size: 14px;
}

.feature-grid,
.category-grid,
.path-grid,
.scenario-grid,
.card-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.feature-card,
.category-card,
.path-card,
.scenario-card,
.info-card,
.faq-item,
.note-card {
    background: var(--card);
    border: 1px solid rgba(218,231,246,.9);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: 0 12px 34px rgba(34, 93, 160, .07);
}

.category-card,
.path-card {
    display: block;
    transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}

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

.icon {
    width: 44px;
    height: 44px;
    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: 12px;
}

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

.security-layout,
.split-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    align-items: center;
}

.security-panel,
.control-panel {
    border-radius: 28px;
    padding: 24px;
    background:
        linear-gradient(180deg, rgba(255,255,255,.92), rgba(239,247,255,.9));
    border: 1px solid rgba(70,139,223,.16);
    box-shadow: var(--shadow);
}

.panel-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 0;
    border-bottom: 1px solid rgba(210,226,244,.9);
}

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

.panel-row span {
    color: #536982;
}

.panel-row strong {
    color: #1c467a;
    text-align: right;
}

.process-steps,
.article-steps {
    counter-reset: step;
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
}

.process-step,
.article-step {
    position: relative;
    padding: 20px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
}

.process-step::before,
.article-step::before {
    counter-increment: step;
    content: counter(step);
    width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 12px;
    border-radius: 12px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
}

.cta-section {
    text-align: center;
    padding: 42px 24px;
    border-radius: 30px;
    background:
        radial-gradient(circle at top left, rgba(70,139,223,.18), transparent 28rem),
        linear-gradient(135deg, #f1f7ff, #fff);
    border: 1px solid rgba(70,139,223,.16);
    box-shadow: var(--shadow);
}

.page-hero {
    padding: 48px 0 28px;
}

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

.page-hero p {
    max-width: 760px;
}

.article-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    align-items: start;
}

.article-body {
    background: rgba(255,255,255,.82);
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 24px;
    box-shadow: 0 14px 38px rgba(34, 93, 160, .07);
}

.article-body h2 {
    font-size: 25px;
    margin-top: 26px;
}

.article-body h2:first-child {
    margin-top: 0;
}

.tip-list,
.clean-list {
    padding: 0;
    margin: 16px 0 0;
    list-style: none;
    display: grid;
    gap: 10px;
}

.tip-list li,
.clean-list li {
    padding: 12px 14px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fbfdff;
    color: #52657d;
}

.side-panel {
    position: relative;
    background: linear-gradient(180deg, #fff, #f2f8ff);
    border: 1px solid rgba(70,139,223,.16);
    border-radius: 26px;
    padding: 22px;
    box-shadow: var(--shadow);
}

.side-panel h3 {
    margin-bottom: 8px;
}

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

.faq-item h2,
.faq-item h3 {
    font-size: 19px;
}

.download-box {
    max-width: 760px;
    margin: 0 auto;
    text-align: center;
    background: linear-gradient(135deg, #fff, #edf6ff);
    border: 1px solid rgba(70,139,223,.18);
    border-radius: 30px;
    padding: 34px 24px;
    box-shadow: var(--shadow);
}

.timeline {
    display: grid;
    gap: 14px;
    margin-top: 22px;
}

.timeline-item {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 12px;
    align-items: start;
}

.timeline-item b {
    width: 34px;
    height: 34px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
}

.site-footer {
    margin-top: 48px;
    padding: 42px 0 24px;
    background: #f4f9ff;
    border-top: 1px solid var(--line);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

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

.site-footer h3 {
    font-size: 16px;
    margin-bottom: 10px;
}

.site-footer a {
    display: block;
    color: #536982;
    margin: 6px 0;
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 28px;
    padding-top: 18px;
    border-top: 1px solid var(--line);
    color: #6f8095;
    font-size: 14px;
}

@media (min-width: 640px) {
    .category-grid,
    .path-grid,
    .scenario-grid,
    .card-grid,
    .metric-strip {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: 1.4fr 1fr 1fr;
    }

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

@media (min-width: 880px) {
    .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;
    }

    .site-nav a {
        padding: 9px 11px;
    }

    .hero {
        padding: 76px 0 54px;
    }

    .hero-layout {
        grid-template-columns: minmax(0, 1.04fr) minmax(380px, .96fr);
        gap: 54px;
    }

    .hero-visual {
        min-height: 560px;
    }

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

    .path-grid,
    .metric-strip {
        grid-template-columns: repeat(4, 1fr);
    }

    .security-layout,
    .split-layout {
        grid-template-columns: minmax(0, .95fr) minmax(360px, 1.05fr);
        gap: 40px;
    }

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

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

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

    .article-body {
        padding: 34px;
    }
}

@media (min-width: 1080px) {
    .site-nav a {
        padding: 10px 14px;
    }

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

    .path-grid {
        grid-template-columns: repeat(6, 1fr);
    }
}