* {
    box-sizing: border-box;
}

:root {
    --primary: rgb(70,139,223);
    --primary-dark: #1f5fae;
    --primary-soft: #eef6ff;
    --ink: #142033;
    --muted: #5c6b80;
    --line: #dbe8f7;
    --card: #ffffff;
    --bg: #f7fbff;
    --shadow: 0 18px 45px rgba(44, 102, 177, 0.12);
    --radius: 22px;
}

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:
        radial-gradient(circle at 10% 0%, rgba(70,139,223,0.12), transparent 28%),
        linear-gradient(180deg, #f2f8ff 0%, #ffffff 42%, #f7fbff 100%);
    line-height: 1.72;
    overflow-x: hidden;
}

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

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

.container {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,0.9);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(219,232,247,0.8);
}

.nav-container {
    min-height: 70px;
    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;
    color: #14345d;
    letter-spacing: 0.02em;
}

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

.nav-toggle {
    width: 44px;
    height: 44px;
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 14px;
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    padding: 0 11px;
}

.nav-toggle span {
    display: block;
    height: 2px;
    background: var(--primary);
    border-radius: 999px;
}

.site-nav {
    position: absolute;
    top: 70px;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    gap: 8px;
    padding: 16px;
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 18px;
    box-shadow: var(--shadow);
}

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

.site-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #30445f;
    font-size: 15px;
}

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

.section {
    padding: 54px 0;
}

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

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

.eyebrow,
.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(70,139,223,0.1);
    color: var(--primary-dark);
    font-weight: 700;
    font-size: 13px;
}

h1, h2, h3 {
    line-height: 1.22;
    color: #10213a;
    margin: 0 0 14px;
}

h1 {
    font-size: clamp(32px, 8vw, 56px);
    letter-spacing: -0.04em;
}

h2 {
    font-size: clamp(26px, 5vw, 38px);
    letter-spacing: -0.03em;
}

h3 {
    font-size: 20px;
}

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

.hero {
    padding: 46px 0 30px;
}

.hero-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 28px;
    align-items: center;
}

.hero-copy {
    padding-top: 10px;
}

.hero-copy p {
    font-size: 17px;
    max-width: 650px;
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 22px 0;
}

.hero-visual {
    position: relative;
    min-height: 460px;
    padding: 24px;
    border-radius: 32px;
    background:
        linear-gradient(145deg, rgba(255,255,255,0.9), rgba(232,244,255,0.92)),
        radial-gradient(circle at 85% 15%, rgba(70,139,223,0.22), transparent 35%);
    box-shadow: var(--shadow);
    border: 1px solid rgba(219,232,247,0.9);
    overflow: hidden;
}

.app-device {
    width: min(260px, 78%);
    margin: 10px auto 0;
    display: block;
    filter: drop-shadow(0 28px 32px rgba(28,84,152,0.18));
}

.floating-card,
.status-card {
    border: 1px solid rgba(219,232,247,0.9);
    background: rgba(255,255,255,0.88);
    border-radius: 18px;
    box-shadow: 0 12px 30px rgba(44,102,177,0.12);
    padding: 14px;
}

.status-card {
    position: absolute;
    left: 18px;
    top: 22px;
    width: 174px;
}

.risk-card {
    position: absolute;
    right: 18px;
    bottom: 24px;
    width: 190px;
}

.asset-card {
    position: absolute;
    left: 20px;
    bottom: 38px;
    width: 180px;
}

.status-dot {
    width: 10px;
    height: 10px;
    background: #37b56a;
    border-radius: 50%;
    display: inline-block;
    margin-right: 7px;
}

.hero-labels {
    position: absolute;
    right: 18px;
    top: 28px;
    display: grid;
    gap: 10px;
    width: 190px;
}

.hero-labels span {
    padding: 9px 12px;
    background: rgba(70,139,223,0.1);
    color: #1c5594;
    border: 1px solid rgba(70,139,223,0.15);
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 26px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 16px 28px rgba(70,139,223,0.24);
    border: none;
    cursor: pointer;
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    background: #327bd0;
    box-shadow: 0 20px 32px rgba(70,139,223,0.3);
}

.card,
.category-card,
.feature-card,
.scenario-card,
.faq-item,
.guide-card,
.notice-card {
    background: var(--card);
    border: 1px solid rgba(219,232,247,0.9);
    border-radius: var(--radius);
    box-shadow: 0 12px 28px rgba(44,102,177,0.08);
}

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

.overview-strip {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
}

.overview-item {
    padding: 18px;
    border-radius: 18px;
    background: linear-gradient(180deg, #fff, #f1f8ff);
    border: 1px solid var(--line);
}

.overview-item strong {
    display: block;
    color: #14345d;
    font-size: 18px;
    margin-bottom: 4px;
}

.path-steps {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
    counter-reset: path;
}

.path-card {
    position: relative;
    padding: 20px 20px 20px 72px;
    border-radius: 20px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: 0 10px 22px rgba(44,102,177,0.08);
}

.path-card::before {
    counter-increment: path;
    content: counter(path);
    position: absolute;
    left: 20px;
    top: 22px;
    width: 36px;
    height: 36px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    color: #fff;
    font-weight: 800;
    background: var(--primary);
}

.path-card a,
.category-card a,
.inline-link {
    color: var(--primary-dark);
    font-weight: 800;
}

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

.category-card {
    padding: 20px;
    background: linear-gradient(180deg, #ffffff, #f5faff);
    transition: transform .2s ease, border-color .2s ease;
}

.category-card:hover {
    transform: translateY(-4px);
    border-color: rgba(70,139,223,0.45);
}

.feature-card .icon,
.category-card .icon,
.scenario-card .icon {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border-radius: 14px;
    background: rgba(70,139,223,0.12);
    color: var(--primary-dark);
    font-weight: 900;
    margin-bottom: 14px;
}

.security-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 22px;
    align-items: center;
}

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

.security-line {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 0;
    border-bottom: 1px solid rgba(219,232,247,0.85);
}

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

.check {
    width: 24px;
    height: 24px;
    display: grid;
    place-items: center;
    flex: 0 0 24px;
    border-radius: 50%;
    color: #fff;
    background: var(--primary);
    font-size: 14px;
}

.process-steps {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

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

.step-number {
    display: inline-flex;
    width: 34px;
    height: 34px;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    margin-bottom: 12px;
}

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

.faq-item {
    padding: 20px;
}

.faq-item h3 {
    font-size: 18px;
}

.cta-section {
    margin: 24px 0 62px;
    padding: 34px 22px;
    text-align: center;
    border-radius: 30px;
    background:
        radial-gradient(circle at 15% 0%, rgba(70,139,223,0.16), transparent 35%),
        linear-gradient(135deg, #ffffff, #eaf5ff);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.page-hero {
    padding: 46px 0 20px;
}

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

.article-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 22px;
    align-items: start;
}

.article-main {
    background: rgba(255,255,255,0.78);
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 24px;
    box-shadow: 0 12px 28px rgba(44,102,177,0.08);
}

.article-side {
    display: grid;
    gap: 16px;
}

.article-main ul,
.article-main ol,
.notice-card ul,
.guide-card ul {
    margin: 10px 0 0;
    padding-left: 20px;
    color: var(--muted);
}

.article-main li,
.notice-card li,
.guide-card li {
    margin: 8px 0;
}

.mini-steps {
    display: grid;
    gap: 12px;
    margin: 20px 0;
}

.mini-step {
    padding: 16px;
    border-radius: 18px;
    background: var(--primary-soft);
    border: 1px solid var(--line);
}

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

.site-footer {
    padding: 42px 0 22px;
    background: #10213a;
    color: #dceaff;
}

.site-footer p,
.site-footer a,
.footer-bottom span {
    color: #b7c8de;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 22px;
}

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

.site-footer a {
    display: block;
    margin: 8px 0;
}

.footer-brand {
    color: #fff;
    margin-bottom: 12px;
}

.footer-bottom {
    margin-top: 28px;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,0.12);
    font-size: 14px;
}

@media (min-width: 640px) {
    .container {
        width: min(1120px, calc(100% - 48px));
    }

    .overview-strip,
    .category-grid,
    .feature-grid,
    .scenario-grid,
    .tip-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

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

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

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

    .hero-layout,
    .security-layout,
    .article-layout {
        grid-template-columns: 1.05fr .95fr;
    }

    .hero-visual {
        min-height: 520px;
    }

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

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

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

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

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

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

    .footer-grid {
        grid-template-columns: 1.5fr 1fr 1fr 1fr;
    }

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

@media (max-width: 420px) {
    .hero-visual {
        min-height: 520px;
        padding: 18px;
    }

    .status-card,
    .asset-card,
    .risk-card,
    .hero-labels {
        position: relative;
        left: auto;
        right: auto;
        top: auto;
        bottom: auto;
        width: 100%;
        margin-top: 10px;
    }

    .hero-labels {
        display: flex;
        flex-wrap: wrap;
    }

    .app-device {
        width: 210px;
    }

    .download-btn {
        width: 100%;
    }
}