:root {
    --primary: rgb(70,139,223);
    --primary-dark: #1f5fa9;
    --primary-soft: #eaf4ff;
    --bg: #f6faff;
    --text: #132238;
    --muted: #5e718a;
    --line: #dce9f7;
    --card: #ffffff;
    --shadow: 0 18px 45px rgba(31, 95, 169, 0.12);
    --radius: 22px;
}

* {
    box-sizing: border-box;
}

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, #f2f8ff 0%, #ffffff 42%, #f6faff 100%);
    line-height: 1.75;
    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, 0.88);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(220, 233, 247, 0.85);
}

.header-inner {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    position: relative;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: 0.2px;
}

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

.brand-text {
    font-size: 18px;
    color: #113b68;
}

.nav-toggle {
    display: none;
}

.nav-trigger {
    width: 42px;
    height: 42px;
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fff;
    cursor: pointer;
}

.nav-trigger span {
    display: block;
    height: 2px;
    background: var(--primary-dark);
    border-radius: 4px;
}

.site-nav {
    position: absolute;
    top: 62px;
    right: 0;
    left: 0;
    display: none;
    flex-direction: column;
    gap: 8px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
    box-shadow: var(--shadow);
}

.nav-toggle:checked ~ .site-nav {
    display: flex;
}

.site-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #27445f;
    font-size: 15px;
}

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

.hero {
    width: min(1180px, calc(100% - 32px));
    margin: 24px auto 0;
    padding: 36px 22px;
    border: 1px solid rgba(190, 220, 250, 0.8);
    border-radius: 28px;
    background:
        radial-gradient(circle at 84% 20%, rgba(70,139,223,0.16), transparent 28%),
        linear-gradient(135deg, #ffffff 0%, #eef7ff 58%, #ffffff 100%);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.hero-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 34px;
    align-items: center;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    color: var(--primary-dark);
    background: rgba(70,139,223,0.1);
    border: 1px solid rgba(70,139,223,0.22);
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
}

h1,
h2,
h3 {
    line-height: 1.25;
    margin: 0 0 14px;
    color: #10243d;
}

h1 {
    font-size: clamp(34px, 8vw, 58px);
    letter-spacing: -1.8px;
    margin-top: 14px;
}

h2 {
    font-size: clamp(25px, 5vw, 36px);
    letter-spacing: -0.8px;
}

h3 {
    font-size: 19px;
}

p {
    margin: 0 0 16px;
    color: var(--muted);
}

.hero-desc {
    font-size: 17px;
    max-width: 640px;
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 20px 0 22px;
}

.hero-tags span {
    padding: 8px 12px;
    border: 1px solid var(--line);
    background: rgba(255,255,255,0.72);
    border-radius: 999px;
    font-size: 13px;
    color: #355773;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    min-width: 142px;
    padding: 13px 22px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 12px 24px rgba(70,139,223,0.28);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    background: var(--primary-dark);
    box-shadow: 0 16px 28px rgba(70,139,223,0.32);
}

.hero-visual {
    position: relative;
    min-height: 410px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.phone-frame {
    width: min(260px, 78vw);
    padding: 12px;
    border-radius: 34px;
    background: #ffffff;
    border: 1px solid rgba(70,139,223,0.18);
    box-shadow: 0 24px 55px rgba(40, 101, 178, 0.18);
}

.phone-frame img {
    border-radius: 26px;
}

.floating-card {
    position: absolute;
    border: 1px solid rgba(204, 224, 246, 0.9);
    background: rgba(255,255,255,0.88);
    backdrop-filter: blur(12px);
    border-radius: 18px;
    box-shadow: 0 16px 36px rgba(34, 82, 136, 0.12);
    padding: 14px 16px;
}

.card-status {
    left: 0;
    top: 30px;
    max-width: 210px;
}

.card-status strong,
.card-status span {
    display: block;
}

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

.card-tags {
    right: 0;
    bottom: 24px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.card-tags span {
    font-size: 13px;
    color: #244b74;
}

.trust-strip {
    margin-top: 26px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

.trust-strip div {
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: rgba(255,255,255,0.86);
    box-shadow: 0 8px 22px rgba(31,95,169,0.06);
}

.trust-strip strong,
.trust-strip span {
    display: block;
}

.trust-strip span {
    margin-top: 4px;
    color: var(--muted);
    font-size: 14px;
}

.section {
    padding: 56px 0;
}

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

.section-heading h2 {
    margin-top: 12px;
}

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

.category-card,
.feature-card,
.scenario-card,
.overview-card,
.notice-card {
    border: 1px solid var(--line);
    background: rgba(255,255,255,0.92);
    border-radius: var(--radius);
    box-shadow: 0 12px 28px rgba(31,95,169,0.07);
}

.category-card {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 20px;
    transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.category-card:hover {
    transform: translateY(-4px);
    border-color: rgba(70,139,223,0.42);
    box-shadow: var(--shadow);
}

.category-card strong {
    color: #123b64;
    font-size: 18px;
}

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

.split-layout,
.security-layout,
.recommend-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    align-items: center;
}

.overview-card,
.notice-card,
.feature-card,
.scenario-card {
    padding: 24px;
}

.check-list {
    list-style: none;
    padding: 0;
    margin: 14px 0 0;
}

.check-list li {
    position: relative;
    padding-left: 28px;
    margin-bottom: 12px;
    color: #405b74;
}

.check-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 7px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary-soft);
    border: 4px solid rgba(70,139,223,0.55);
}

.icon-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 42px;
    height: 34px;
    padding: 0 10px;
    border-radius: 999px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 800;
    margin-bottom: 16px;
}

.feature-card p,
.scenario-card p {
    margin-bottom: 0;
}

.security-section {
    background:
        linear-gradient(135deg, rgba(234,244,255,0.95), rgba(255,255,255,0.95)),
        radial-gradient(circle at 20% 20%, rgba(70,139,223,0.12), transparent 32%);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

.security-panel {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

.security-panel div {
    padding: 18px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: 0 10px 22px rgba(31,95,169,0.07);
}

.security-panel strong,
.security-panel span {
    display: block;
}

.security-panel span {
    color: var(--muted);
    font-size: 14px;
    margin-top: 4px;
}

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

.step {
    padding: 22px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: 0 10px 24px rgba(31,95,169,0.07);
}

.step span {
    display: inline-flex;
    width: 36px;
    height: 36px;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    color: #fff;
    background: var(--primary);
    font-weight: 800;
    margin-bottom: 14px;
}

.step p {
    margin-bottom: 0;
}

.recommend-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
}

.recommend-list a {
    padding: 16px 18px;
    border-radius: 16px;
    border: 1px solid var(--line);
    background: #fff;
    color: #234968;
    font-weight: 700;
}

.faq-list {
    display: grid;
    gap: 12px;
}

.faq-item {
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 18px 20px;
    background: #fff;
    box-shadow: 0 8px 20px rgba(31,95,169,0.06);
}

.faq-item summary {
    cursor: pointer;
    font-weight: 800;
    color: #173f63;
}

.faq-item p {
    margin: 12px 0 0;
}

.cta-section {
    text-align: center;
    padding: 46px 22px;
    border: 1px solid rgba(70,139,223,0.18);
    border-radius: 28px;
    background: linear-gradient(135deg, #ffffff, #eaf4ff);
    box-shadow: var(--shadow);
}

.cta-section h2 {
    margin-top: 12px;
}

.cta-section p {
    max-width: 680px;
    margin-left: auto;
    margin-right: auto;
}

.compact-cta {
    margin-bottom: 56px;
}

.page-hero {
    padding: 52px 0 24px;
}

.page-hero h1 {
    max-width: 900px;
}

.page-hero p {
    max-width: 840px;
    font-size: 17px;
}

.narrow-hero {
    text-align: center;
}

.narrow-hero p {
    margin-left: auto;
    margin-right: auto;
}

.article-body {
    align-items: start;
}

.warning-card {
    background: linear-gradient(135deg, #fff, #f0f7ff);
}

.full-faq {
    padding-top: 16px;
}

.two-col {
    grid-template-columns: 1fr;
}

.site-footer {
    background: #f0f6fd;
    border-top: 1px solid var(--line);
    margin-top: 20px;
}

.footer-inner {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
    padding: 32px 0;
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

.footer-brand {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.footer-logo {
    width: 42px;
    height: 42px;
    border-radius: 14px;
}

.footer-brand p {
    margin: 4px 0 0;
    max-width: 560px;
    font-size: 14px;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.footer-links a {
    padding: 8px 12px;
    border-radius: 999px;
    background: #fff;
    border: 1px solid var(--line);
    color: #31516d;
    font-size: 14px;
}

.footer-bottom {
    border-top: 1px solid var(--line);
    padding: 16px;
    text-align: center;
    color: var(--muted);
    font-size: 13px;
}

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

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

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

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

    .site-nav a {
        padding: 9px 12px;
    }

    .hero {
        margin-top: 34px;
        padding: 58px 54px;
    }

    .hero-layout {
        grid-template-columns: 1.05fr 0.95fr;
        gap: 48px;
    }

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

    .phone-frame {
        width: 300px;
    }

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

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

    .split-layout,
    .security-layout,
    .recommend-layout {
        grid-template-columns: 1fr 1fr;
        gap: 44px;
    }

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

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

    .footer-inner {
        grid-template-columns: 1.2fr 0.8fr;
        align-items: center;
    }

    .footer-links {
        justify-content: flex-end;
    }

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

@media (max-width: 420px) {
    .hero {
        width: min(100% - 22px, 1180px);
        padding: 28px 16px;
    }

    .container,
    .header-inner,
    .footer-inner {
        width: calc(100% - 24px);
    }

    .floating-card {
        position: static;
        margin-top: 12px;
        width: 100%;
    }

    .hero-visual {
        min-height: auto;
        display: block;
    }

    .phone-frame {
        margin: 0 auto;
    }

    .card-tags {
        flex-direction: row;
        flex-wrap: wrap;
    }

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