:root {
    --primary: rgb(70,139,223);
    --primary-dark: rgb(32,90,164);
    --primary-soft: rgb(232,243,255);
    --ink: rgb(21,34,56);
    --muted: rgb(91,105,128);
    --line: rgba(70,139,223,0.18);
    --white: #ffffff;
    --card: rgba(255,255,255,0.92);
    --shadow: 0 14px 36px rgba(31, 84, 148, 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(--ink);
    background: linear-gradient(180deg, #f4f9ff 0%, #ffffff 42%, #eef6ff 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, 1160px);
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,0.86);
    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;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--primary-dark);
    font-size: 18px;
}

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

.nav-toggle {
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    background: var(--white);
    color: var(--primary-dark);
    border-radius: 14px;
    font-size: 21px;
    cursor: pointer;
}

.site-nav {
    display: none;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    padding: 12px;
    background: rgba(255,255,255,0.98);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}

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

.site-nav a {
    padding: 12px 14px;
    border-radius: 12px;
    color: var(--muted);
    font-weight: 650;
    font-size: 15px;
}

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

.hero {
    position: relative;
    padding: 58px 0 42px;
    overflow: hidden;
}

.hero:before {
    content: "";
    position: absolute;
    width: 460px;
    height: 460px;
    border-radius: 999px;
    background: radial-gradient(circle, rgba(70,139,223,0.20), rgba(70,139,223,0));
    top: -120px;
    right: -180px;
    pointer-events: none;
}

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

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    background: rgba(70,139,223,0.10);
    color: var(--primary-dark);
    border: 1px solid rgba(70,139,223,0.18);
    border-radius: 999px;
    font-size: 13px;
    font-weight: 750;
}

h1, h2, h3 {
    line-height: 1.25;
    margin: 0 0 14px;
    letter-spacing: -0.03em;
}

h1 {
    font-size: clamp(34px, 8vw, 64px);
    max-width: 820px;
}

h2 {
    font-size: clamp(26px, 5vw, 42px);
}

h3 {
    font-size: 20px;
}

.lead {
    font-size: 17px;
    color: var(--muted);
    margin: 0 0 24px;
    max-width: 680px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--primary), rgb(95,164,239));
    color: #fff;
    font-weight: 800;
    box-shadow: 0 12px 24px rgba(70,139,223,0.22);
    transition: transform .2s ease, box-shadow .2s ease;
    border: none;
    cursor: pointer;
    white-space: nowrap;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 32px rgba(70,139,223,0.28);
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: center;
}

.micro-note {
    color: var(--muted);
    font-size: 14px;
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 22px 0 0;
    padding: 0;
    list-style: none;
}

.tag-list li, .pill {
    padding: 8px 12px;
    border-radius: 999px;
    background: var(--white);
    border: 1px solid var(--line);
    color: var(--primary-dark);
    font-size: 13px;
    font-weight: 700;
}

.phone-card {
    position: relative;
    display: grid;
    place-items: center;
    padding: 24px;
    border-radius: 30px;
    background: linear-gradient(145deg, rgba(255,255,255,0.95), rgba(232,243,255,0.88));
    box-shadow: var(--shadow);
    border: 1px solid rgba(255,255,255,0.92);
}

.phone-card img {
    width: min(320px, 84vw);
    filter: drop-shadow(0 28px 35px rgba(32,90,164,0.18));
}

.stat-row {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    margin-top: 22px;
}

.stat-box {
    padding: 16px;
    border-radius: 18px;
    background: rgba(255,255,255,0.92);
    border: 1px solid var(--line);
}

.stat-box strong {
    display: block;
    color: var(--primary-dark);
    font-size: 21px;
}

.section {
    padding: 48px 0;
}

.section-head {
    margin-bottom: 24px;
    max-width: 760px;
}

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

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

.card {
    padding: 22px;
}

.card p, .content-panel p, .notice-card p {
    color: var(--muted);
    margin: 0;
}

.feature-grid, .guide-grid, .faq-grid {
    display: grid;
    gap: 16px;
}

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

.icon-badge {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border-radius: 15px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
    margin-bottom: 14px;
}

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

.content-panel {
    padding: 24px;
}

.content-panel p + p {
    margin-top: 14px;
}

.notice-card {
    padding: 22px;
    background: linear-gradient(145deg, rgba(232,243,255,0.96), rgba(255,255,255,0.96));
}

.notice-card ul, .step-list, .clean-list {
    margin: 12px 0 0;
    padding-left: 20px;
    color: var(--muted);
}

.notice-card li, .step-list li, .clean-list li {
    margin: 8px 0;
}

.cta-band {
    padding: 28px;
    border-radius: 28px;
    background: linear-gradient(135deg, rgba(70,139,223,0.13), rgba(255,255,255,0.96));
    border: 1px solid rgba(70,139,223,0.18);
    display: grid;
    gap: 18px;
    align-items: center;
}

.faq-item {
    padding: 20px;
}

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

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

.page-hero {
    padding: 54px 0 28px;
}

.page-hero .lead {
    margin-bottom: 0;
}

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

.article-main {
    display: grid;
    gap: 18px;
}

.article-main .content-panel h2 {
    font-size: 24px;
}

.sidebar {
    display: grid;
    gap: 16px;
}

.download-section {
    text-align: center;
}

.download-card {
    max-width: 760px;
    margin: 0 auto;
    padding: 28px;
}

.site-footer {
    background: #f7fbff;
    border-top: 1px solid var(--line);
    padding: 38px 0 22px;
}

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

.footer-brand {
    color: var(--primary-dark);
    font-weight: 900;
    font-size: 20px;
    margin-bottom: 10px;
}

.site-footer p {
    margin: 0;
    color: var(--muted);
    max-width: 520px;
}

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

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

.footer-bottom {
    margin-top: 24px;
    padding-top: 18px;
    border-top: 1px solid var(--line);
    color: var(--muted);
    font-size: 14px;
}

@media (min-width: 680px) {
    .container {
        width: min(100% - 48px, 1160px);
    }

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

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

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

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

@media (min-width: 960px) {
    .nav-toggle {
        display: none;
    }

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

    .site-nav a {
        font-size: 14px;
        padding: 9px 12px;
    }

    .hero {
        padding: 82px 0 68px;
    }

    .hero-grid {
        grid-template-columns: 1.08fr .92fr;
    }

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

    .split {
        grid-template-columns: 1.1fr .9fr;
    }

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

    .footer-grid {
        grid-template-columns: 1.4fr .7fr .7fr;
    }

    .page-hero {
        padding: 72px 0 34px;
    }
}