:root {
    --primary: rgb(70,139,223);
    --primary-dark: #245fba;
    --primary-soft: #eaf4ff;
    --ink: #0e213d;
    --muted: #5f7088;
    --line: rgba(70,139,223,0.16);
    --card: rgba(255,255,255,0.92);
    --shadow: 0 18px 45px rgba(32, 82, 145, 0.10);
    --radius: 22px;
    --max: 1180px;
}

* {
    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(--ink);
    background:
        radial-gradient(circle at 12% 8%, rgba(70,139,223,0.16), transparent 28%),
        radial-gradient(circle at 86% 16%, rgba(70,139,223,0.13), transparent 26%),
        linear-gradient(180deg, #f6fbff 0%, #ffffff 42%, #f3f8ff 100%);
    line-height: 1.75;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,0.84);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(70,139,223,0.12);
}

.header-inner,
.footer-inner,
.container {
    width: min(calc(100% - 32px), var(--max));
    margin: 0 auto;
}

.header-inner {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: #102844;
}

.logo img {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    object-fit: cover;
    box-shadow: 0 8px 22px rgba(70,139,223,0.18);
}

.nav-toggle {
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fff;
    padding: 0 11px;
}

.nav-toggle span {
    width: 20px;
    height: 2px;
    border-radius: 999px;
    background: var(--ink);
}

.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 74px;
    display: none;
    flex-direction: column;
    gap: 8px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: #fff;
    box-shadow: var(--shadow);
}

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

.site-nav a {
    padding: 10px 12px;
    border-radius: 14px;
    color: var(--muted);
    font-weight: 650;
}

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

.hero,
.page-hero {
    padding: 54px 0 38px;
}

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

.eyebrow,
.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    width: fit-content;
    padding: 7px 12px;
    border: 1px solid rgba(70,139,223,0.22);
    border-radius: 999px;
    background: rgba(255,255,255,0.74);
    color: var(--primary-dark);
    font-weight: 700;
    font-size: 13px;
}

h1,
h2,
h3 {
    margin: 0 0 14px;
    line-height: 1.18;
    letter-spacing: -0.035em;
}

h1 {
    font-size: clamp(34px, 9vw, 62px);
}

h2 {
    font-size: clamp(26px, 5vw, 40px);
}

h3 {
    font-size: 20px;
}

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

.lead {
    font-size: 18px;
    color: #405572;
}

.hero-actions,
.page-actions {
    margin-top: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 50px;
    padding: 13px 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 30px rgba(70,139,223,0.26);
    transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
    border: 0;
    cursor: pointer;
    white-space: nowrap;
}

.download-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 18px 35px rgba(70,139,223,0.32);
}

.trust-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 26px;
}

.hero-visual {
    position: relative;
    padding: 22px;
    border-radius: 32px;
    background: linear-gradient(145deg, rgba(255,255,255,0.88), rgba(232,244,255,0.92));
    box-shadow: var(--shadow);
    border: 1px solid rgba(255,255,255,0.92);
}

.hero-visual::before {
    content: "";
    position: absolute;
    inset: 12px;
    border: 1px solid rgba(70,139,223,0.12);
    border-radius: 26px;
    pointer-events: none;
}

.hero-visual img {
    width: min(330px, 86vw);
    margin: 0 auto;
    filter: drop-shadow(0 28px 35px rgba(17, 47, 90, 0.16));
}

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

.metric {
    padding: 16px;
    border-radius: 18px;
    background: rgba(255,255,255,0.80);
    border: 1px solid rgba(70,139,223,0.14);
}

.metric strong {
    display: block;
    font-size: 22px;
    color: var(--primary-dark);
}

.section {
    padding: 38px 0;
}

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

.section-head.center {
    text-align: center;
    max-width: 760px;
    margin-left: auto;
    margin-right: auto;
}

.card,
.info-panel,
.faq-item,
.step-item {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--card);
    box-shadow: 0 10px 28px rgba(32,82,145,0.07);
}

.card {
    padding: 22px;
}

.card h3,
.faq-item h3,
.step-item h3 {
    color: #123157;
}

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

.feature-card {
    min-height: 100%;
}

.icon-box {
    width: 44px;
    height: 44px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
    margin-bottom: 14px;
}

.split {
    display: grid;
    gap: 18px;
    align-items: center;
}

.info-panel {
    padding: 24px;
    background: linear-gradient(145deg, rgba(255,255,255,0.94), rgba(236,246,255,0.92));
}

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

.info-list li {
    position: relative;
    padding-left: 26px;
    color: #405572;
}

.info-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 10px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 0 5px rgba(70,139,223,0.12);
}

.faq-item {
    padding: 20px;
}

.faq-item p:last-child,
.card p:last-child,
.step-item p:last-child {
    margin-bottom: 0;
}

.step-item {
    padding: 20px;
    display: grid;
    gap: 10px;
}

.step-number {
    width: 38px;
    height: 38px;
    border-radius: 13px;
    display: grid;
    place-items: center;
    background: var(--primary);
    color: #fff;
    font-weight: 900;
}

.cta-band {
    padding: 28px;
    border-radius: 28px;
    background: linear-gradient(135deg, rgba(70,139,223,0.12), rgba(255,255,255,0.88));
    border: 1px solid rgba(70,139,223,0.20);
    display: grid;
    gap: 20px;
    align-items: center;
}

.page-hero .container {
    max-width: 920px;
}

.article-wrap {
    width: min(calc(100% - 32px), 920px);
    margin: 0 auto;
}

.article-card {
    padding: 24px;
    border-radius: 26px;
    background: rgba(255,255,255,0.92);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.article-card + .article-card {
    margin-top: 18px;
}

.notice {
    padding: 18px 20px;
    border-radius: 20px;
    background: #f0f7ff;
    border: 1px solid rgba(70,139,223,0.20);
    color: #2b527d;
}

.notice strong {
    color: var(--primary-dark);
}

.site-footer {
    margin-top: 42px;
    padding: 38px 0 20px;
    background: rgba(255,255,255,0.70);
    border-top: 1px solid rgba(70,139,223,0.12);
}

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

.footer-brand p {
    max-width: 520px;
    margin-top: 12px;
}

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

.footer-links a {
    color: var(--muted);
}

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

.footer-bottom {
    width: min(calc(100% - 32px), var(--max));
    margin: 24px auto 0;
    padding-top: 18px;
    border-top: 1px solid rgba(70,139,223,0.12);
    color: #6c7d92;
    font-size: 14px;
}

@media (min-width: 680px) {
    .metric-row {
        grid-template-columns: repeat(3, 1fr);
    }

    .feature-grid,
    .card-grid,
    .guide-grid,
    .faq-grid,
    .steps-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

@media (min-width: 940px) {
    .nav-toggle {
        display: none;
    }

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

    .site-nav a {
        padding: 9px 13px;
    }

    .hero {
        padding: 82px 0 54px;
    }

    .hero-grid {
        grid-template-columns: minmax(0, 1.05fr) minmax(340px, .95fr);
        gap: 54px;
    }

    .split {
        grid-template-columns: 1.05fr .95fr;
        gap: 32px;
    }

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

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

    .page-hero {
        padding: 72px 0 40px;
    }

    .article-card {
        padding: 34px;
    }

    .footer-inner {
        grid-template-columns: 1.3fr .7fr;
        align-items: start;
    }
}