* {
    box-sizing: border-box;
}

:root {
    --primary: rgb(70,139,223);
    --primary-dark: #225f9f;
    --primary-soft: #edf6ff;
    --ink: #152235;
    --muted: #65738a;
    --line: #dce9f7;
    --card: #ffffff;
    --bg: #f7fbff;
    --radius: 22px;
    --shadow: 0 18px 45px rgba(28, 82, 143, 0.10);
}

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, #f0f8ff 0%, #ffffff 42%, #f7fbff 100%);
    line-height: 1.7;
    overflow-x: hidden;
}

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

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

.container {
    width: min(100% - 32px, 1160px);
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.86);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(220, 233, 247, 0.78);
}

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

.brand,
.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.brand-logo {
    width: 40px;
    height: 40px;
    border-radius: 12px;
}

.brand-text {
    font-weight: 800;
    letter-spacing: -0.02em;
    color: #0f2a4a;
}

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

.nav-toggle span {
    width: 18px;
    height: 2px;
    background: var(--ink);
    border-radius: 99px;
}

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

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

.site-nav a {
    padding: 12px 14px;
    border-radius: 12px;
    color: #31465f;
    font-weight: 650;
}

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

.hero {
    padding: 56px 0 34px;
}

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

.eyebrow,
.badge {
    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-size: 14px;
    font-weight: 700;
}

h1,
h2,
h3 {
    line-height: 1.22;
    margin: 0 0 14px;
    color: #10233b;
}

h1 {
    font-size: clamp(34px, 8vw, 62px);
    letter-spacing: -0.045em;
}

h2 {
    font-size: clamp(26px, 4vw, 40px);
    letter-spacing: -0.03em;
}

h3 {
    font-size: 20px;
}

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

.lead {
    font-size: 18px;
    color: #44556f;
}

.hero-actions,
.section-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    margin-top: 24px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 30px rgba(70,139,223,0.28);
    transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
    border: 0;
    cursor: pointer;
}

.download-btn:hover {
    transform: translateY(-2px);
    background: #3f84d6;
    box-shadow: 0 18px 36px rgba(70,139,223,0.34);
}

.trust-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 22px;
}

.trust-tags span {
    padding: 8px 12px;
    border: 1px solid rgba(70,139,223,0.18);
    background: rgba(255,255,255,0.76);
    color: #31506e;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 650;
}

.hero-card {
    position: relative;
    padding: 20px;
    border-radius: 30px;
    background: linear-gradient(145deg, rgba(255,255,255,0.94), rgba(236,247,255,0.96));
    border: 1px solid rgba(220, 233, 247, 0.92);
    box-shadow: var(--shadow);
}

.hero-card::before {
    content: "";
    position: absolute;
    inset: 18px -10px auto auto;
    width: 130px;
    height: 130px;
    background: radial-gradient(circle, rgba(70,139,223,0.20), transparent 68%);
    pointer-events: none;
}

.app-shot {
    width: min(100%, 390px);
    margin: 0 auto;
    filter: drop-shadow(0 25px 30px rgba(20, 70, 130, 0.12));
}

.stat-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-top: 18px;
}

.stat {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 13px;
    text-align: center;
}

.stat strong {
    display: block;
    color: var(--primary-dark);
    font-size: 18px;
}

.stat span {
    color: var(--muted);
    font-size: 12px;
}

.section {
    padding: 42px 0;
}

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

.grid,
.feature-grid,
.card-grid,
.steps-grid {
    display: grid;
    gap: 16px;
}

.card,
.info-card,
.faq-item,
.guide-panel {
    background: var(--card);
    border: 1px solid rgba(220, 233, 247, 0.92);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: 0 14px 35px rgba(28,82,143,0.07);
}

.card.highlight {
    background: linear-gradient(145deg, #ffffff, #eef7ff);
}

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

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

.soft-panel {
    padding: 24px;
    border-radius: 26px;
    background: linear-gradient(145deg, #eff7ff, #ffffff);
    border: 1px solid var(--line);
}

.check-list {
    padding: 0;
    margin: 18px 0 0;
    list-style: none;
}

.check-list li {
    position: relative;
    padding-left: 28px;
    margin: 12px 0;
    color: #465a73;
}

.check-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    top: 0;
    color: var(--primary);
    font-weight: 900;
}

.page-hero {
    padding: 54px 0 24px;
}

.page-hero .container {
    display: grid;
    gap: 18px;
}

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

.breadcrumb a {
    color: var(--primary-dark);
    font-weight: 700;
}

.article {
    padding: 18px 0 50px;
}

.article-layout {
    display: grid;
    gap: 22px;
}

.article-main {
    background: rgba(255,255,255,0.82);
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 24px;
    box-shadow: var(--shadow);
}

.article-main p {
    font-size: 16px;
}

.tip-box {
    background: #f0f7ff;
    border: 1px solid rgba(70,139,223,0.18);
    color: #35516d;
    border-radius: 20px;
    padding: 18px;
    margin: 20px 0;
}

.tip-box strong {
    color: #173c68;
}

.steps {
    counter-reset: step;
    padding: 0;
    margin: 20px 0;
    list-style: none;
}

.steps li {
    counter-increment: step;
    display: grid;
    grid-template-columns: 42px 1fr;
    gap: 14px;
    align-items: start;
    padding: 16px 0;
    border-bottom: 1px solid var(--line);
}

.steps li::before {
    content: counter(step);
    width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    background: var(--primary);
    color: #fff;
    font-weight: 900;
}

.steps li:last-child {
    border-bottom: 0;
}

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

.faq-item h2,
.faq-item h3 {
    font-size: 19px;
}

.cta-section {
    margin: 32px 0 4px;
    padding: 28px;
    border-radius: 28px;
    background: linear-gradient(135deg, rgba(70,139,223,0.13), rgba(255,255,255,0.94));
    border: 1px solid rgba(70,139,223,0.18);
}

.site-footer {
    margin-top: 30px;
    padding: 44px 0 24px;
    background: #10233b;
    color: #dce8f6;
}

.site-footer p,
.site-footer a,
.footer-bottom span {
    color: #aec0d5;
}

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

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

.site-footer h3 {
    font-size: 16px;
    color: #fff;
}

.site-footer a {
    display: block;
    margin: 8px 0;
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 28px;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,0.10);
    font-size: 13px;
}

@media (min-width: 720px) {
    .container {
        width: min(100% - 56px, 1160px);
    }

    .hero {
        padding: 76px 0 46px;
    }

    .hero-grid,
    .split,
    .article-layout {
        grid-template-columns: 1.05fr 0.95fr;
    }

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

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

    .article-main {
        padding: 34px;
    }
}

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

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

    .site-nav a {
        padding: 9px 12px;
        font-size: 15px;
    }

    .hero-grid {
        grid-template-columns: 1.1fr 0.9fr;
    }

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

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

    .footer-grid {
        grid-template-columns: 1.4fr repeat(3, 1fr);
    }

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

    .page-hero {
        padding-top: 72px;
    }
}