* {
    box-sizing: border-box;
}

:root {
    --primary: rgb(70,139,223);
    --primary-dark: #1f5fae;
    --primary-soft: #e9f3ff;
    --primary-soft-2: #f4f9ff;
    --text: #132238;
    --muted: #607087;
    --line: #dbe8f7;
    --panel: rgba(255,255,255,.86);
    --white: #ffffff;
    --shadow: 0 18px 45px rgba(37, 91, 154, .10);
    --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(--text);
    background: linear-gradient(180deg, #f7fbff 0%, #ffffff 36%, #f5f9ff 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: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.86);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(219,232,247,.85);
}

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

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: #10243f;
    letter-spacing: .2px;
}

.logo {
    width: 36px;
    height: 36px;
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(70,139,223,.18);
}

.nav-toggle {
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--white);
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    cursor: pointer;
}

.nav-toggle span {
    width: 18px;
    height: 2px;
    border-radius: 99px;
    background: var(--text);
}

.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 74px;
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 12px;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}

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

.site-nav a {
    padding: 11px 12px;
    border-radius: 12px;
    color: #43536a;
    font-size: 15px;
}

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

.section {
    padding: 58px 0;
}

.section-sm {
    padding: 42px 0;
}

.section-title {
    margin: 0 0 12px;
    font-size: clamp(28px, 4vw, 44px);
    line-height: 1.2;
    letter-spacing: -.6px;
}

.section-desc {
    margin: 0;
    color: var(--muted);
    max-width: 760px;
}

.badge,
.category-badge,
.status-pill {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 7px 12px;
    border-radius: 999px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-size: 13px;
    font-weight: 700;
}

.hero {
    padding: 48px 0 54px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    inset: -160px -120px auto auto;
    width: 360px;
    height: 360px;
    background: radial-gradient(circle, rgba(70,139,223,.22), rgba(70,139,223,0) 68%);
    pointer-events: none;
}

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

.hero-copy h1 {
    margin: 18px 0 16px;
    font-size: clamp(34px, 8vw, 64px);
    line-height: 1.08;
    letter-spacing: -1.4px;
}

.hero-copy p {
    margin: 0 0 22px;
    color: var(--muted);
    font-size: 17px;
}

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

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--primary), #3d7fd4);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 28px rgba(70,139,223,.25);
    transition: transform .2s ease, box-shadow .2s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 18px 34px rgba(70,139,223,.30);
}

.hero-visual {
    position: relative;
    min-height: 470px;
    display: grid;
    place-items: center;
    border-radius: 32px;
    background: linear-gradient(135deg, rgba(70,139,223,.13), rgba(255,255,255,.72));
    border: 1px solid rgba(219,232,247,.8);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.hero-visual::after {
    content: "";
    position: absolute;
    width: 260px;
    height: 260px;
    border-radius: 50%;
    background: rgba(70,139,223,.10);
    left: -100px;
    bottom: -100px;
}

.app-shot {
    width: min(66%, 280px);
    margin: 0 auto;
    position: relative;
    z-index: 2;
    filter: drop-shadow(0 22px 35px rgba(31,95,174,.18));
}

.floating-card,
.security-status-card {
    position: absolute;
    z-index: 3;
    background: rgba(255,255,255,.92);
    border: 1px solid rgba(219,232,247,.9);
    border-radius: 18px;
    padding: 13px 15px;
    box-shadow: 0 18px 34px rgba(37,91,154,.12);
    color: #213957;
    font-size: 13px;
}

.security-status-card {
    left: 18px;
    top: 18px;
    width: 185px;
}

.security-status-card strong {
    display: block;
    font-size: 15px;
    margin-bottom: 4px;
}

.float-a { right: 16px; top: 86px; }
.float-b { left: 18px; bottom: 78px; }
.float-c { right: 18px; bottom: 28px; }
.float-d { right: 34px; top: 210px; }

.metrics-bar {
    display: grid;
    gap: 14px;
    margin-top: 28px;
}

.metric-item {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 18px;
    box-shadow: 0 10px 30px rgba(31,95,174,.06);
}

.metric-item strong {
    display: block;
    font-size: 18px;
    margin-bottom: 5px;
}

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

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

.path-steps,
.category-grid,
.feature-grid,
.scenario-grid,
.recommend-grid,
.guide-grid,
.info-grid {
    display: grid;
    gap: 16px;
    margin-top: 26px;
}

.path-card,
.category-card,
.feature-card,
.scenario-card,
.recommend-card,
.guide-card,
.info-card,
.tip-card,
.faq-item,
.step-card {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: 0 12px 30px rgba(37,91,154,.07);
}

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

.path-card::before {
    content: attr(data-step);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 13px;
    margin-bottom: 12px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
}

.path-card h3,
.category-card h3,
.feature-card h3,
.scenario-card h3,
.recommend-card h3,
.guide-card h3,
.info-card h3,
.step-card h3 {
    margin: 0 0 8px;
    font-size: 19px;
}

.path-card p,
.category-card p,
.feature-card p,
.scenario-card p,
.recommend-card p,
.guide-card p,
.info-card p,
.step-card p,
.tip-card p,
.faq-item p {
    margin: 0;
    color: var(--muted);
}

.card-link {
    display: inline-flex;
    margin-top: 14px;
    color: var(--primary-dark);
    font-weight: 800;
}

.category-nav {
    display: flex;
    gap: 10px;
    overflow-x: auto;
    padding-bottom: 4px;
    margin-top: 22px;
}

.category-nav a {
    white-space: nowrap;
    padding: 9px 13px;
    border-radius: 999px;
    background: var(--white);
    border: 1px solid var(--line);
    color: var(--primary-dark);
    font-weight: 700;
    font-size: 14px;
}

.security-layout,
.two-col {
    display: grid;
    gap: 22px;
    align-items: center;
}

.security-panel {
    background: linear-gradient(160deg, #ffffff, #edf6ff);
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 24px;
    box-shadow: var(--shadow);
}

.panel-row {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 0;
    border-bottom: 1px solid rgba(219,232,247,.9);
}

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

.panel-icon {
    flex: 0 0 34px;
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
}

.process-steps,
.steps {
    display: grid;
    gap: 14px;
    margin-top: 24px;
}

.step-card span {
    display: inline-flex;
    margin-bottom: 10px;
    font-weight: 800;
    color: var(--primary-dark);
}

.faq-list {
    display: grid;
    gap: 14px;
    margin-top: 24px;
}

.faq-item h3 {
    margin: 0 0 8px;
    font-size: 18px;
}

.cta-section {
    text-align: center;
    background: linear-gradient(135deg, #edf6ff, #ffffff 48%, #eaf4ff);
    border: 1px solid var(--line);
    border-radius: 30px;
    padding: 34px 20px;
    box-shadow: var(--shadow);
}

.cta-section h2 {
    margin: 0 0 10px;
    font-size: clamp(26px, 5vw, 40px);
}

.cta-section p {
    margin: 0 auto 22px;
    color: var(--muted);
    max-width: 680px;
}

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

.page-hero-inner {
    background: linear-gradient(135deg, #ffffff, #eff7ff);
    border: 1px solid var(--line);
    border-radius: 30px;
    padding: 28px;
    box-shadow: var(--shadow);
}

.page-hero h1 {
    margin: 14px 0 12px;
    font-size: clamp(30px, 6vw, 52px);
    line-height: 1.14;
}

.page-hero p {
    margin: 0;
    color: var(--muted);
    max-width: 820px;
}

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

.article-main,
.article-side {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: 0 14px 34px rgba(37,91,154,.07);
}

.article-main h2,
.article-side h2,
.content-panel h2 {
    margin: 0 0 12px;
    font-size: 24px;
}

.article-main p,
.content-panel p {
    color: var(--muted);
}

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

.check-list li,
.clean-list li {
    position: relative;
    padding-left: 30px;
    color: #475a72;
}

.check-list li::before,
.clean-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    top: 0;
    width: 20px;
    height: 20px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-size: 12px;
    font-weight: 900;
}

.notice-box {
    margin-top: 20px;
    padding: 18px;
    border-radius: 18px;
    background: #f6fbff;
    border: 1px solid var(--line);
    color: #425672;
}

.download-single {
    margin-top: 22px;
}

.download-page-card {
    display: grid;
    gap: 22px;
    align-items: center;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 30px;
    padding: 28px;
    box-shadow: var(--shadow);
}

.site-footer {
    margin-top: 50px;
    background: #f3f8ff;
    border-top: 1px solid var(--line);
    padding: 40px 0 18px;
}

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

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

.footer-logo {
    width: 34px;
    height: 34px;
    border-radius: 12px;
}

.site-footer h3 {
    margin: 0 0 10px;
    font-size: 16px;
}

.site-footer p,
.footer-bottom {
    color: var(--muted);
    font-size: 14px;
}

.site-footer a {
    display: block;
    color: #50627a;
    margin: 7px 0;
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding-top: 22px;
    margin-top: 24px;
    border-top: 1px solid var(--line);
}

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

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

@media (min-width: 920px) {
    .nav-toggle {
        display: none;
    }

    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        background: transparent;
        border: 0;
        box-shadow: none;
        padding: 0;
        gap: 2px;
    }

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

    .hero {
        padding: 74px 0 72px;
    }

    .hero-layout,
    .security-layout,
    .two-col,
    .download-page-card {
        grid-template-columns: 1.04fr .96fr;
    }

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

    .path-steps {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

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

    .article-layout {
        grid-template-columns: minmax(0, 1fr) 340px;
    }

    .footer-grid {
        grid-template-columns: 1.6fr 1fr 1fr 1fr;
    }

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

@media (min-width: 1180px) {
    .hero-copy p {
        font-size: 18px;
    }

    .section {
        padding: 72px 0;
    }
}