* {
    box-sizing: border-box;
}

:root {
    --primary: rgb(70,139,223);
    --primary-dark: rgb(32,93,169);
    --primary-soft: rgb(232,243,255);
    --ink: #152238;
    --muted: #5d6b82;
    --line: #dbe8f7;
    --card: #ffffff;
    --bg: #f7fbff;
    --radius: 22px;
    --shadow: 0 18px 45px rgba(31, 80, 145, 0.12);
}

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: linear-gradient(180deg, #f4f9ff 0%, #ffffff 36%, #f8fbff 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, 0.88);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(219, 232, 247, 0.85);
}

.nav-wrap {
    min-height: 72px;
    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;
}

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

.brand-name {
    font-size: 1.05rem;
    color: var(--primary-dark);
}

.nav-toggle {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.nav-trigger {
    width: 44px;
    height: 44px;
    border: 1px solid var(--line);
    border-radius: 14px;
    display: grid;
    place-content: center;
    gap: 5px;
    background: #fff;
}

.nav-trigger span {
    display: block;
    width: 20px;
    height: 2px;
    border-radius: 999px;
    background: var(--primary-dark);
}

.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 78px;
    display: none;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #ffffff;
    box-shadow: var(--shadow);
}

.site-nav a {
    display: block;
    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:checked ~ .site-nav {
    display: block;
}

.main-hero {
    padding: 44px 0 30px;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 28px;
    align-items: center;
}

.eyebrow,
.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    width: fit-content;
    padding: 7px 12px;
    color: var(--primary-dark);
    background: rgba(70,139,223,0.1);
    border: 1px solid rgba(70,139,223,0.18);
    border-radius: 999px;
    font-size: 0.88rem;
    font-weight: 700;
}

h1,
h2,
h3 {
    margin: 0;
    color: var(--ink);
    line-height: 1.2;
    letter-spacing: -0.025em;
}

h1 {
    margin-top: 16px;
    font-size: clamp(2rem, 8vw, 4.4rem);
}

h2 {
    font-size: clamp(1.45rem, 4vw, 2.35rem);
}

h3 {
    font-size: 1.12rem;
}

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

.lead {
    margin-top: 18px;
    font-size: 1.05rem;
}

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

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    border-radius: 999px;
    background: rgb(70,139,223);
    color: #ffffff;
    font-weight: 800;
    box-shadow: 0 12px 26px rgba(70,139,223,0.28);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 34px rgba(70,139,223,0.34);
}

.hero-note {
    color: var(--muted);
    font-size: 0.92rem;
}

.hero-card {
    position: relative;
    padding: 22px;
    border: 1px solid rgba(70,139,223,0.15);
    border-radius: 30px;
    background: linear-gradient(145deg, rgba(255,255,255,0.96), rgba(232,243,255,0.72));
    box-shadow: var(--shadow);
}

.hero-card::before {
    content: "";
    position: absolute;
    inset: 18px;
    border-radius: 24px;
    background: radial-gradient(circle at 45% 20%, rgba(70,139,223,0.18), transparent 48%);
    z-index: -1;
}

.product-image {
    width: min(92%, 420px);
    margin: 0 auto;
    border-radius: 26px;
}

.trust-row {
    margin-top: 18px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
}

.trust-row span,
.data-chip {
    padding: 12px 14px;
    border-radius: 16px;
    background: #ffffff;
    border: 1px solid var(--line);
    color: var(--primary-dark);
    font-weight: 750;
    text-align: center;
}

.section {
    padding: 42px 0;
}

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

.section-head p {
    margin-top: 12px;
}

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

.card {
    padding: 22px;
    border-radius: var(--radius);
    background: var(--card);
    border: 1px solid rgba(219, 232, 247, 0.9);
    box-shadow: 0 12px 28px rgba(31, 80, 145, 0.08);
}

.card.blue {
    background: linear-gradient(160deg, rgba(232,243,255,0.96), #ffffff);
}

.card h3 {
    margin-bottom: 10px;
}

.icon {
    width: 42px;
    height: 42px;
    display: grid;
    place-content: center;
    margin-bottom: 14px;
    border-radius: 14px;
    background: rgba(70,139,223,0.12);
    color: var(--primary-dark);
    font-weight: 900;
}

.split {
    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;
    align-items: start;
}

.info-panel {
    padding: 24px;
    border-radius: 26px;
    background: linear-gradient(135deg, rgba(70,139,223,0.12), rgba(255,255,255,0.95));
    border: 1px solid rgba(70,139,223,0.18);
}

.info-panel ul,
.check-list,
.steps {
    margin: 14px 0 0;
    padding-left: 20px;
    color: var(--muted);
}

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

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

.faq-item {
    padding: 20px;
    border-radius: 20px;
    background: #fff;
    border: 1px solid var(--line);
}

.faq-item h3 {
    margin-bottom: 8px;
}

.cta-band {
    display: grid;
    gap: 18px;
    align-items: center;
    padding: 26px;
    border-radius: 28px;
    background: linear-gradient(135deg, rgb(70,139,223), rgb(112,173,239));
    color: #fff;
    box-shadow: 0 18px 45px rgba(70,139,223,0.26);
}

.cta-band h2,
.cta-band p {
    color: #fff;
}

.cta-band .download-btn {
    background: #fff;
    color: var(--primary-dark);
    box-shadow: none;
}

.page-hero {
    padding: 48px 0 28px;
    background:
        radial-gradient(circle at 10% 20%, rgba(70,139,223,0.13), transparent 24%),
        linear-gradient(180deg, #eef7ff 0%, rgba(255,255,255,0) 100%);
}

.page-hero .container {
    max-width: 900px;
}

.article {
    max-width: 900px;
    margin: 0 auto;
}

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

.article .download-zone {
    margin: 24px 0;
}

.note-box {
    padding: 18px;
    border-left: 4px solid var(--primary);
    border-radius: 16px;
    background: var(--primary-soft);
    color: var(--muted);
}

.steps {
    counter-reset: step;
    list-style: none;
    padding-left: 0;
}

.steps li {
    position: relative;
    padding: 16px 16px 16px 54px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
}

.steps li::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 16px;
    top: 16px;
    width: 26px;
    height: 26px;
    display: grid;
    place-content: center;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
}

.site-footer {
    margin-top: 48px;
    padding: 40px 0 24px;
    background: #10243f;
    color: #dce9f8;
}

.site-footer p,
.site-footer a,
.site-footer span {
    color: #b8c9dc;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    color: #fff;
}

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

.site-footer h2 {
    margin-bottom: 10px;
    color: #ffffff;
    font-size: 1rem;
}

.site-footer a {
    display: block;
    padding: 5px 0;
}

.footer-bottom {
    margin-top: 28px;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,0.12);
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 0.9rem;
}

@media (min-width: 700px) {
    .container {
        width: min(100% - 48px, 1160px);
    }

    .main-hero {
        padding: 64px 0 44px;
    }

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

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

    .cta-band {
        grid-template-columns: 1fr auto;
        padding: 34px;
    }

    .footer-grid {
        grid-template-columns: 2fr 1fr 1fr;
    }
}

@media (min-width: 980px) {
    .nav-trigger {
        display: none;
    }

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

    .site-nav a {
        padding: 10px 13px;
    }

    .hero-grid {
        grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.95fr);
        gap: 52px;
    }

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

    .split {
        grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
        gap: 28px;
    }

    .page-hero {
        padding: 70px 0 40px;
    }

    .section {
        padding: 56px 0;
    }
}