* {
    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: #172033;
    background: linear-gradient(180deg, #f3f8ff 0%, #ffffff 46%, #f7fbff 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, 1180px);
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(70, 139, 223, 0.12);
}

.header-inner {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: #12375e;
    letter-spacing: 0.2px;
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: 12px;
}

.brand-text {
    font-size: 18px;
}

.nav-toggle {
    width: 44px;
    height: 44px;
    border: 1px solid rgba(70, 139, 223, 0.22);
    border-radius: 14px;
    background: #fff;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    cursor: pointer;
}

.nav-toggle span {
    width: 20px;
    height: 2px;
    background: rgb(70, 139, 223);
    border-radius: 999px;
}

.main-nav {
    position: absolute;
    top: 68px;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    padding: 12px;
    border: 1px solid rgba(70, 139, 223, 0.13);
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 18px 42px rgba(21, 63, 112, 0.12);
}

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

.main-nav a {
    padding: 12px 14px;
    border-radius: 14px;
    color: #38516e;
    font-weight: 600;
}

.main-nav a:hover {
    background: rgba(70, 139, 223, 0.1);
    color: rgb(70, 139, 223);
}

.banner {
    position: relative;
    padding: 54px 0 40px;
}

.banner::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 360px;
    background: radial-gradient(circle at top right, rgba(70, 139, 223, 0.22), transparent 45%), linear-gradient(135deg, rgba(70,139,223,0.14), rgba(255,255,255,0));
    pointer-events: none;
}

.banner-grid {
    position: relative;
    display: grid;
    gap: 32px;
    align-items: center;
}

.hero-copy h1,
.subpage-hero h1 {
    margin: 0 0 16px;
    color: #10233d;
    font-size: clamp(32px, 7vw, 58px);
    line-height: 1.12;
    letter-spacing: -1.4px;
}

.hero-copy p,
.subpage-hero p,
.section-lead {
    margin: 0 0 22px;
    color: #56677f;
    font-size: 16px;
}

.badges {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 20px 0 26px;
}

.badge {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 6px 12px;
    border: 1px solid rgba(70, 139, 223, 0.18);
    border-radius: 999px;
    color: #2c629d;
    background: rgba(255, 255, 255, 0.72);
    font-weight: 700;
    font-size: 13px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: rgb(70, 139, 223);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 16px 30px rgba(70, 139, 223, 0.25);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    background: #367fd4;
    box-shadow: 0 18px 36px rgba(70, 139, 223, 0.3);
}

.hero-device {
    position: relative;
    padding: 16px;
    border-radius: 30px;
    background: linear-gradient(145deg, rgba(70, 139, 223, 0.15), rgba(255,255,255,0.96));
    box-shadow: 0 24px 70px rgba(25, 75, 130, 0.16);
}

.hero-device img {
    width: min(100%, 420px);
    margin: 0 auto;
    border-radius: 30px;
}

.section {
    padding: 44px 0;
}

.section-title {
    margin: 0 0 12px;
    color: #10233d;
    font-size: clamp(26px, 5vw, 40px);
    line-height: 1.25;
    letter-spacing: -0.7px;
}

.card,
.info-card,
.faq-item,
.step-card {
    border: 1px solid rgba(70, 139, 223, 0.12);
    border-radius: 22px;
    background: rgba(255, 255, 255, 0.88);
    box-shadow: 0 16px 42px rgba(30, 80, 130, 0.08);
}

.card {
    padding: 22px;
}

.card h3,
.info-card h3,
.step-card h3 {
    margin: 0 0 10px;
    color: #10233d;
    font-size: 20px;
}

.card p,
.info-card p,
.step-card p,
.faq-item p {
    margin: 0;
    color: #5b6b81;
}

.feature-grid,
.card-grid,
.step-grid,
.faq-grid {
    display: grid;
    gap: 18px;
}

.feature-card {
    padding: 22px;
    border-radius: 22px;
    background: linear-gradient(180deg, #ffffff, #f4f9ff);
    border: 1px solid rgba(70, 139, 223, 0.13);
    box-shadow: 0 14px 34px rgba(26, 77, 131, 0.07);
}

.feature-icon {
    width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
    border-radius: 15px;
    background: rgba(70, 139, 223, 0.12);
    color: rgb(70, 139, 223);
    font-weight: 900;
}

.info-band {
    padding: 24px;
    border-radius: 26px;
    background: linear-gradient(135deg, rgba(70,139,223,0.12), rgba(255,255,255,0.92));
    border: 1px solid rgba(70, 139, 223, 0.14);
}

.info-card {
    padding: 22px;
}

.faq-item {
    padding: 20px;
}

.faq-item h2,
.faq-item h3 {
    margin: 0 0 8px;
    color: #10233d;
    font-size: 18px;
}

.subpage-hero {
    padding: 50px 0 26px;
    background: radial-gradient(circle at 80% 0%, rgba(70,139,223,0.18), transparent 36%);
}

.article-layout {
    display: grid;
    gap: 22px;
    padding-bottom: 54px;
}

.article-main {
    padding: 24px;
    border-radius: 26px;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(70, 139, 223, 0.13);
    box-shadow: 0 16px 44px rgba(30, 80, 130, 0.08);
}

.article-main p {
    margin: 0 0 16px;
    color: #506178;
}

.article-main p:last-child {
    margin-bottom: 0;
}

.aside-panel {
    padding: 22px;
    border-radius: 24px;
    background: #f0f7ff;
    border: 1px solid rgba(70, 139, 223, 0.14);
}

.aside-panel h2,
.aside-panel h3 {
    margin: 0 0 12px;
    color: #12375e;
    font-size: 20px;
}

.aside-panel ul,
.check-list,
.steps-list {
    margin: 0;
    padding-left: 20px;
    color: #506178;
}

.aside-panel li,
.check-list li,
.steps-list li {
    margin: 8px 0;
}

.cta-strip {
    margin-top: 26px;
    padding: 24px;
    border-radius: 26px;
    background: linear-gradient(135deg, rgb(70,139,223), #6fa9ed);
    color: #fff;
    display: grid;
    gap: 18px;
    align-items: center;
}

.cta-strip h2,
.cta-strip p {
    margin: 0;
}

.cta-strip .download-btn {
    background: #fff;
    color: rgb(70, 139, 223);
    box-shadow: none;
}

.download-page .download-btn,
.article-layout .download-btn,
.subpage-hero .download-btn {
    width: fit-content;
}

.step-card {
    padding: 22px;
}

.step-number {
    width: 36px;
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 12px;
    border-radius: 50%;
    background: rgba(70,139,223,0.14);
    color: rgb(70,139,223);
    font-weight: 900;
}

.site-footer {
    margin-top: 28px;
    padding: 42px 0 22px;
    color: #d8e8fb;
    background: #10233d;
}

.footer-grid {
    display: grid;
    gap: 26px;
}

.footer-brand {
    margin-bottom: 10px;
    color: #fff;
    font-size: 22px;
    font-weight: 900;
}

.site-footer h3 {
    margin: 0 0 12px;
    color: #fff;
    font-size: 16px;
}

.site-footer p {
    margin: 0;
    color: #c7d8ed;
}

.site-footer a {
    display: block;
    margin: 8px 0;
    color: #c7d8ed;
}

.footer-bottom {
    margin-top: 30px;
    padding-top: 18px;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    display: grid;
    gap: 8px;
    color: #a9c0da;
    font-size: 13px;
}

@media (min-width: 640px) {
    .container {
        width: min(100% - 48px, 1180px);
    }

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

    .cta-strip {
        grid-template-columns: 1fr auto;
    }
}

@media (min-width: 860px) {
    .nav-toggle {
        display: none;
    }

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

    .main-nav a {
        padding: 8px 12px;
        font-size: 14px;
    }

    .banner {
        padding: 80px 0 62px;
    }

    .banner-grid {
        grid-template-columns: minmax(0, 1.04fr) minmax(320px, .8fr);
    }

    .section {
        padding: 62px 0;
    }

    .article-layout {
        grid-template-columns: minmax(0, 1fr) 330px;
        align-items: start;
    }

    .footer-grid {
        grid-template-columns: 1.4fr repeat(3, 1fr);
    }

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

@media (min-width: 1040px) {
    .feature-grid,
    .card-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

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

    .hero-copy p,
    .subpage-hero p,
    .section-lead {
        font-size: 18px;
    }
}