:root {
    --primary: rgb(70,139,223);
    --primary-dark: #2364b5;
    --primary-soft: #eaf4ff;
    --ink: #102033;
    --muted: #5f6f85;
    --line: #dbe8f8;
    --card: rgba(255,255,255,0.92);
    --bg: #f6fbff;
    --radius: 22px;
    --shadow: 0 18px 50px rgba(30, 88, 150, 0.12);
}

* {
    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);
    line-height: 1.75;
    background:
        radial-gradient(circle at 10% 0%, rgba(70,139,223,0.16), transparent 26rem),
        radial-gradient(circle at 100% 12%, rgba(70,139,223,0.12), transparent 22rem),
        linear-gradient(180deg, #f4faff 0%, #ffffff 48%, #f6fbff 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(255,255,255,0.9);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(219,232,248,0.9);
}

.header-inner {
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: #12345c;
    letter-spacing: -0.02em;
}

.logo img {
    width: 36px;
    height: 36px;
    border-radius: 12px;
}

.nav-toggle {
    border: 1px solid var(--line);
    background: #fff;
    color: var(--primary-dark);
    border-radius: 14px;
    padding: 8px 12px;
    font-size: 22px;
    line-height: 1;
}

.site-nav {
    display: none;
    position: absolute;
    top: 70px;
    left: 16px;
    right: 16px;
    padding: 14px;
    background: rgba(255,255,255,0.98);
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: var(--shadow);
}

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

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

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

main {
    min-height: 68vh;
}

.section {
    padding: 58px 0;
}

.section-tight {
    padding: 38px 0;
}

.section-title {
    max-width: 780px;
    margin: 0 auto 28px;
    text-align: center;
}

.section-title h2,
.page-title h1,
.hero-copy h1 {
    line-height: 1.15;
    letter-spacing: -0.04em;
}

.section-title h2 {
    margin: 0 0 12px;
    font-size: clamp(28px, 4vw, 42px);
}

.section-title p,
.page-title p,
.hero-copy p,
.card p,
.info-panel p {
    color: var(--muted);
}

.hero {
    padding: 46px 0 48px;
}

.hero-layout {
    display: grid;
    gap: 32px;
    align-items: center;
}

.eyebrow,
.badge {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    width: fit-content;
    padding: 6px 12px;
    color: var(--primary-dark);
    background: rgba(70,139,223,0.12);
    border: 1px solid rgba(70,139,223,0.2);
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
}

.hero-copy h1 {
    margin: 16px 0 18px;
    font-size: clamp(38px, 9vw, 64px);
}

.hero-copy p {
    margin: 0 0 20px;
    font-size: 17px;
}

.hero-tags,
.inline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 18px 0 24px;
}

.hero-tags span,
.inline-tags span {
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,0.82);
    border: 1px solid var(--line);
    color: #35516d;
    font-size: 13px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 22px;
    color: #fff;
    background: linear-gradient(135deg, var(--primary), #3a7ed7);
    border-radius: 999px;
    font-weight: 800;
    box-shadow: 0 14px 30px rgba(70,139,223,0.28);
    transition: transform .2s ease, box-shadow .2s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 18px 42px rgba(70,139,223,0.32);
}

.hero-visual {
    position: relative;
    min-height: 410px;
    padding: 20px;
    border-radius: 32px;
    background: linear-gradient(150deg, rgba(255,255,255,0.98), rgba(231,243,255,0.84));
    border: 1px solid rgba(219,232,248,0.95);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.hero-visual:before {
    content: "";
    position: absolute;
    inset: 18px;
    border-radius: 28px;
    background: radial-gradient(circle at 70% 20%, rgba(70,139,223,0.2), transparent 18rem);
    pointer-events: none;
}

.app-shot {
    width: min(270px, 76%);
    margin: 14px auto 0;
    position: relative;
    z-index: 2;
    filter: drop-shadow(0 24px 30px rgba(33,79,130,0.18));
}

.status-card,
.float-card {
    position: relative;
    z-index: 3;
    background: rgba(255,255,255,0.9);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: 0 12px 28px rgba(31,88,150,0.12);
    padding: 14px;
}

.status-card {
    margin: -16px 0 0 auto;
    width: min(260px, 86%);
}

.status-dot {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 999px;
    background: #20b486;
    box-shadow: 0 0 0 6px rgba(32,180,134,0.12);
    margin-right: 8px;
}

.visual-labels {
    position: relative;
    z-index: 3;
    display: grid;
    gap: 10px;
    margin-top: 14px;
}

.visual-labels span {
    padding: 10px 12px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: rgba(255,255,255,0.82);
    color: #31506f;
    font-size: 14px;
}

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

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

.trust-item,
.card,
.category-card,
.step,
.faq-item,
.info-panel,
.tip-box,
.article-card {
    background: var(--card);
    border: 1px solid rgba(219,232,248,0.95);
    border-radius: var(--radius);
    box-shadow: 0 12px 34px rgba(35,90,155,0.08);
}

.trust-item {
    padding: 18px;
}

.trust-item strong {
    display: block;
    color: var(--primary-dark);
    font-size: 17px;
}

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

.category-card,
.card,
.article-card {
    padding: 22px;
    transition: transform .2s ease, border-color .2s ease;
}

.category-card:hover,
.article-card:hover {
    transform: translateY(-3px);
    border-color: rgba(70,139,223,0.45);
}

.category-card h3,
.card h3,
.article-card h3 {
    margin: 0 0 8px;
    font-size: 20px;
}

.category-card p,
.card p,
.article-card p {
    margin: 0 0 12px;
}

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

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

.info-panel {
    padding: 26px;
    background: linear-gradient(150deg, rgba(255,255,255,0.96), rgba(235,246,255,0.86));
}

.info-panel h2,
.info-panel h3 {
    margin-top: 0;
}

.security-stack {
    display: grid;
    gap: 12px;
}

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

.security-stack strong {
    display: block;
    margin-bottom: 4px;
}

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

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

.step:before {
    counter-increment: step;
    content: counter(step);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    color: #fff;
    background: var(--primary);
    font-weight: 800;
    margin-bottom: 12px;
}

.step h3 {
    margin: 0 0 8px;
}

.step p {
    margin: 0;
    color: var(--muted);
}

.cta-section {
    padding: 34px 24px;
    text-align: center;
    border-radius: 28px;
    background: linear-gradient(135deg, rgba(70,139,223,0.13), rgba(255,255,255,0.95));
    border: 1px solid rgba(70,139,223,0.18);
    box-shadow: var(--shadow);
}

.cta-section h2 {
    margin: 0 0 10px;
    font-size: clamp(26px, 4vw, 40px);
}

.cta-section p {
    margin: 0 auto 20px;
    max-width: 720px;
    color: var(--muted);
}

.page-hero {
    padding: 48px 0 26px;
}

.page-title {
    max-width: 840px;
}

.page-title h1 {
    margin: 16px 0 14px;
    font-size: clamp(34px, 7vw, 54px);
}

.page-title p {
    margin: 0;
    font-size: 17px;
}

.article-content {
    max-width: 880px;
    margin: 0 auto;
}

.article-content p {
    color: #465b73;
}

.article-section {
    margin: 24px 0;
}

.article-section h2,
.article-section h3 {
    margin-bottom: 10px;
}

.tip-box {
    padding: 20px;
    margin: 22px 0;
    border-left: 5px solid var(--primary);
    background: linear-gradient(135deg, #fff, #eef7ff);
}

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

.check-list li,
.clean-list li {
    padding: 12px 14px;
    border-radius: 14px;
    background: rgba(70,139,223,0.08);
    color: #34506c;
}

.check-list li:before {
    content: "✓";
    color: var(--primary-dark);
    font-weight: 900;
    margin-right: 8px;
}

.faq-item {
    padding: 20px;
}

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

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

.download-panel {
    max-width: 820px;
    margin: 0 auto;
    text-align: center;
}

.download-panel .download-btn {
    margin: 10px 0 4px;
}

.site-footer {
    margin-top: 42px;
    padding: 42px 0 24px;
    background: linear-gradient(180deg, rgba(236,247,255,0.85), #ffffff);
    border-top: 1px solid var(--line);
}

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

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

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

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

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

.site-footer a {
    display: block;
    color: #46627e;
    margin: 7px 0;
    font-size: 14px;
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 26px;
    padding-top: 18px;
    border-top: 1px solid var(--line);
}

@media (min-width: 680px) {
    .trust-grid,
    .category-grid,
    .quick-grid,
    .article-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .feature-grid,
    .scenario-grid,
    .recommend-grid,
    .faq-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

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

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

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

    .hero {
        padding: 76px 0 66px;
    }

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

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

    .app-shot {
        width: 300px;
    }

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

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

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

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

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

    .footer-grid {
        grid-template-columns: 1.4fr .8fr .8fr .8fr;
    }

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

@media (max-width: 420px) {
    .container {
        width: min(100% - 24px, 1120px);
    }

    .hero-visual {
        min-height: 360px;
        padding: 14px;
    }

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

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