:root {
    --primary: rgb(70,139,223);
    --primary-dark: #245fba;
    --primary-soft: #edf6ff;
    --text: #132238;
    --muted: #5c6b80;
    --line: rgba(70, 139, 223, 0.16);
    --white: #ffffff;
    --shadow: 0 18px 46px rgba(40, 86, 140, 0.10);
    --radius: 22px;
}

* {
    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(--text);
    background:
        radial-gradient(circle at 10% 0%, rgba(70,139,223,0.18), transparent 26rem),
        radial-gradient(circle at 100% 18%, rgba(166,209,255,0.30), transparent 28rem),
        linear-gradient(180deg, #f4f9ff 0%, #ffffff 48%, #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, 1180px);
    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 var(--line);
}

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

.logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 1.08rem;
    letter-spacing: 0.02em;
}

.logo img {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    box-shadow: 0 10px 24px rgba(70,139,223,0.22);
}

.nav-toggle {
    width: 44px;
    height: 44px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #ffffff;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    cursor: pointer;
}

.nav-toggle span {
    width: 18px;
    height: 2px;
    background: var(--text);
    border-radius: 999px;
}

.main-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 74px;
    display: none;
    flex-direction: column;
    padding: 14px;
    background: rgba(255,255,255,0.98);
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: var(--shadow);
}

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

.nav-link {
    padding: 12px 14px;
    border-radius: 14px;
    color: var(--muted);
    font-weight: 650;
}

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

.hero,
.page-hero {
    padding: 54px 0 34px;
}

.hero-grid {
    display: grid;
    gap: 30px;
    align-items: center;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(70,139,223,0.11);
    color: var(--primary-dark);
    font-weight: 800;
    font-size: 0.86rem;
}

h1,
h2,
h3 {
    margin: 0;
    line-height: 1.22;
    color: #102033;
}

h1 {
    margin-top: 16px;
    font-size: clamp(2rem, 8vw, 4.35rem);
    letter-spacing: -0.055em;
}

h2 {
    font-size: clamp(1.55rem, 4.5vw, 2.5rem);
    letter-spacing: -0.035em;
}

h3 {
    font-size: 1.12rem;
}

.lead {
    margin: 18px 0 0;
    font-size: 1.04rem;
    color: var(--muted);
}

.hero-actions,
.page-actions {
    margin-top: 26px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 50px;
    padding: 0 28px;
    border-radius: 999px;
    background: var(--primary);
    color: #ffffff;
    font-weight: 800;
    box-shadow: 0 16px 32px rgba(70,139,223,0.26);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    background: var(--primary-dark);
    box-shadow: 0 22px 38px rgba(70,139,223,0.32);
}

.hero-note {
    color: var(--muted);
    font-size: 0.94rem;
}

.badges {
    margin-top: 24px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.badge {
    padding: 8px 12px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: rgba(255,255,255,0.75);
    color: #26425f;
    font-weight: 700;
    font-size: 0.88rem;
}

.device-card {
    position: relative;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 32px;
    background: linear-gradient(145deg, rgba(255,255,255,0.92), rgba(234,246,255,0.85));
    box-shadow: var(--shadow);
    overflow: hidden;
}

.device-card:before {
    content: "";
    position: absolute;
    inset: 10% auto auto 8%;
    width: 180px;
    height: 180px;
    border-radius: 50%;
    background: rgba(70,139,223,0.13);
    filter: blur(16px);
}

.device-card img {
    position: relative;
    width: min(82%, 420px);
    margin: 0 auto;
    filter: drop-shadow(0 30px 40px rgba(40, 86, 140, 0.18));
}

.stats-row {
    display: grid;
    gap: 12px;
    margin-top: 18px;
}

.stat {
    padding: 14px;
    border-radius: 18px;
    background: rgba(255,255,255,0.78);
    border: 1px solid var(--line);
}

.stat strong {
    display: block;
    color: var(--primary-dark);
    font-size: 1.25rem;
}

.section {
    padding: 42px 0;
}

.section-head {
    max-width: 760px;
    margin-bottom: 22px;
}

.section-head p {
    margin: 12px 0 0;
    color: var(--muted);
}

.grid,
.feature-grid,
.two-col,
.three-col {
    display: grid;
    gap: 16px;
}

.card,
.info-card,
.faq-item,
.step,
.notice-box {
    background: rgba(255,255,255,0.88);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: 0 14px 36px rgba(32, 82, 130, 0.07);
}

.card,
.info-card,
.faq-item,
.step,
.notice-box {
    padding: 22px;
}

.card p,
.info-card p,
.faq-item p,
.step p,
.notice-box p {
    margin: 10px 0 0;
    color: var(--muted);
}

.icon-chip {
    width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
    margin-bottom: 12px;
}

.soft-panel {
    padding: 24px;
    border-radius: 28px;
    background: linear-gradient(135deg, rgba(70,139,223,0.10), rgba(255,255,255,0.86));
    border: 1px solid var(--line);
}

.list-clean {
    margin: 14px 0 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 10px;
}

.list-clean li {
    padding-left: 24px;
    position: relative;
    color: var(--muted);
}

.list-clean li:before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.72em;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary);
}

.page-hero .lead {
    max-width: 820px;
}

.article-body {
    max-width: 940px;
    margin: 0 auto;
}

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

.article-card {
    margin-top: 22px;
}

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

.step {
    position: relative;
    padding-left: 68px;
}

.step:before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 22px;
    top: 22px;
    width: 32px;
    height: 32px;
    border-radius: 11px;
    background: var(--primary);
    color: #ffffff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
}

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

.faq-item h2,
.faq-item h3 {
    font-size: 1.06rem;
}

.cta-band {
    margin-top: 22px;
    padding: 26px;
    border-radius: 28px;
    background: linear-gradient(135deg, rgba(70,139,223,0.14), rgba(255,255,255,0.9));
    border: 1px solid var(--line);
    display: grid;
    gap: 18px;
    align-items: center;
}

.site-footer {
    margin-top: 48px;
    padding: 42px 0 26px;
    background: #f0f7ff;
    border-top: 1px solid var(--line);
}

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

.footer-brand {
    font-weight: 900;
    font-size: 1.25rem;
    color: var(--primary-dark);
}

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

.site-footer h3 {
    font-size: 1rem;
    margin-bottom: 10px;
}

.site-footer a {
    display: block;
    color: var(--muted);
    margin: 8px 0;
}

.site-footer a:hover {
    color: var(--primary-dark);
}

.footer-bottom {
    margin-top: 26px;
    padding-top: 20px;
    border-top: 1px solid var(--line);
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 0.9rem;
}

@media (min-width: 640px) {
    .container {
        width: min(100% - 48px, 1180px);
    }
    .stats-row,
    .two-col {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .feature-grid,
    .three-col {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .cta-band {
        grid-template-columns: 1fr auto;
    }
}

@media (min-width: 900px) {
    .site-header {
        position: sticky;
    }
    .nav-toggle {
        display: none;
    }
    .main-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        padding: 0;
        background: transparent;
        border: 0;
        box-shadow: none;
        gap: 4px;
    }
    .nav-link {
        padding: 10px 13px;
        font-size: 0.94rem;
    }
    .hero {
        padding: 78px 0 54px;
    }
    .hero-grid {
        grid-template-columns: 1.08fr 0.92fr;
        gap: 50px;
    }
    .page-hero {
        padding: 72px 0 44px;
    }
    .section {
        padding: 58px 0;
    }
    .feature-grid,
    .three-col {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .footer-grid {
        grid-template-columns: 1.4fr 0.8fr 0.8fr;
    }
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}

@media (min-width: 1120px) {
    .lead {
        font-size: 1.12rem;
    }
    .card,
    .info-card,
    .faq-item,
    .step,
    .notice-box {
        padding: 26px;
    }
}