* {
    box-sizing: border-box;
}

:root {
    --primary: rgb(70,139,223);
    --primary-dark: #1f5fae;
    --primary-soft: #eaf4ff;
    --text: #14243b;
    --muted: #60708a;
    --line: rgba(70,139,223,0.16);
    --white: #ffffff;
    --bg: #f5f9ff;
    --shadow: 0 16px 40px rgba(35, 85, 145, 0.10);
    --radius: 22px;
}

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: linear-gradient(180deg, #f2f8ff 0%, #ffffff 42%, #f6fbff 100%);
    line-height: 1.75;
    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: 20;
    background: rgba(255,255,255,0.88);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
}

.nav-wrap {
    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;
    letter-spacing: 0.02em;
    color: #10223f;
}

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

.site-nav {
    position: absolute;
    top: 68px;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    padding: 14px;
    background: rgba(255,255,255,0.98);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}

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

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

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

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

.nav-toggle span {
    width: 20px;
    height: 2px;
    background: var(--primary-dark);
    border-radius: 99px;
}

.hero {
    position: relative;
    padding: 54px 0 38px;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    width: 520px;
    height: 520px;
    right: -220px;
    top: -140px;
    background: radial-gradient(circle, rgba(70,139,223,0.22), rgba(70,139,223,0));
    pointer-events: none;
}

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

.eyebrow,
.tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(70,139,223,0.10);
    color: var(--primary-dark);
    font-weight: 700;
    font-size: 0.88rem;
}

h1,
h2,
h3 {
    line-height: 1.24;
    color: #10213a;
}

h1 {
    margin: 18px 0 16px;
    font-size: clamp(2.05rem, 8vw, 4.2rem);
    letter-spacing: -0.04em;
}

h2 {
    margin: 0 0 14px;
    font-size: clamp(1.55rem, 4vw, 2.35rem);
    letter-spacing: -0.03em;
}

h3 {
    margin: 0 0 10px;
    font-size: 1.12rem;
}

.lead {
    margin: 0 0 24px;
    color: var(--muted);
    font-size: 1.05rem;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 12px 24px rgba(70,139,223,0.28);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    background: var(--primary-dark);
    box-shadow: 0 16px 30px rgba(70,139,223,0.34);
}

.hero-tags,
.badge-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}

.device-card {
    position: relative;
    padding: 18px;
    border-radius: 32px;
    background: linear-gradient(145deg, rgba(255,255,255,0.96), rgba(235,246,255,0.94));
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.device-card::after {
    content: "本地密钥视图";
    position: absolute;
    right: 24px;
    bottom: 24px;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,0.92);
    color: var(--primary-dark);
    font-size: 0.84rem;
    font-weight: 800;
    box-shadow: 0 10px 22px rgba(30,80,130,0.10);
}

.device-card img {
    width: min(78vw, 390px);
    margin: 0 auto;
}

.section {
    padding: 42px 0;
}

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

.section-head p,
.text-block p,
.card p,
.tip-box p,
.faq-item p,
.step-card p {
    color: var(--muted);
    margin: 0;
}

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

.card,
.tip-box,
.faq-item,
.step-card,
.content-panel {
    background: rgba(255,255,255,0.92);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

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

.card .icon {
    width: 44px;
    height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
    border-radius: 14px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
}

.split {
    display: grid;
    gap: 20px;
    align-items: start;
}

.content-panel {
    padding: 24px;
}

.text-block p + p,
.content-panel p + p,
.guide-body p + p {
    margin-top: 14px;
}

.tip-box {
    padding: 20px;
    background: linear-gradient(180deg, #ffffff, #f1f8ff);
}

.tip-list,
.clean-list {
    margin: 12px 0 0;
    padding: 0;
    list-style: none;
}

.tip-list li,
.clean-list li {
    position: relative;
    padding: 8px 0 8px 24px;
    color: var(--muted);
}

.tip-list li::before,
.clean-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 17px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--primary);
}

.stats {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    margin-top: 20px;
}

.stat {
    padding: 18px;
    border-radius: 18px;
    background: var(--primary-soft);
    border: 1px solid var(--line);
}

.stat strong {
    display: block;
    font-size: 1.45rem;
    color: var(--primary-dark);
}

.stat span {
    color: var(--muted);
    font-size: 0.92rem;
}

.page-hero {
    padding: 48px 0 24px;
}

.page-hero .lead {
    max-width: 840px;
}

.article-wrap {
    display: grid;
    gap: 20px;
    padding-bottom: 54px;
}

.guide-body {
    padding: 24px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.action-row {
    margin-top: 22px;
}

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

.faq-item h2,
.faq-item h3 {
    font-size: 1.06rem;
    margin-bottom: 8px;
}

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

.step-card {
    position: relative;
    padding-left: 72px;
}

.step-card::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 22px;
    top: 22px;
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    font-weight: 900;
}

.cta-panel {
    padding: 26px;
    border-radius: 28px;
    background: linear-gradient(135deg, rgba(70,139,223,0.12), rgba(255,255,255,0.96));
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.site-footer {
    padding: 38px 0 24px;
    background: #10213a;
    color: rgba(255,255,255,0.82);
}

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

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

.footer-brand img {
    width: 34px;
    height: 34px;
    border-radius: 10px;
}

.site-footer h3 {
    color: #fff;
    font-size: 1rem;
}

.site-footer a {
    display: block;
    padding: 4px 0;
    color: rgba(255,255,255,0.74);
}

.site-footer a:hover {
    color: #fff;
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 26px;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,0.12);
    font-size: 0.9rem;
    color: rgba(255,255,255,0.58);
}

@media (min-width: 700px) {
    .container {
        width: min(100% - 56px, 1180px);
    }

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

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

    .footer-grid {
        grid-template-columns: 1.5fr 1fr 1fr;
    }

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

@media (min-width: 960px) {
    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
    }

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

    .nav-toggle {
        display: none;
    }

    .hero {
        padding: 86px 0 70px;
    }

    .hero-grid {
        grid-template-columns: minmax(0, 1.02fr) minmax(360px, 0.78fr);
        gap: 54px;
    }

    .split,
    .article-wrap {
        grid-template-columns: minmax(0, 1.35fr) minmax(310px, 0.65fr);
        gap: 24px;
    }

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

    .section {
        padding: 66px 0;
    }

    .page-hero {
        padding: 70px 0 34px;
    }

    .lead {
        font-size: 1.15rem;
    }
}