* {
    box-sizing: border-box;
}

:root {
    --primary: rgb(70,139,223);
    --primary-dark: #245fa8;
    --primary-soft: #eaf3ff;
    --text: #172033;
    --muted: #64748b;
    --line: #dbe7f5;
    --card: #ffffff;
    --bg: #f6faff;
    --shadow: 0 16px 36px rgba(36, 95, 168, 0.10);
    --radius-lg: 24px;
    --radius-md: 18px;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-width: 320px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 12% 4%, rgba(70,139,223,0.18), transparent 24rem),
        linear-gradient(180deg, #f8fbff 0%, #eef6ff 48%, #ffffff 100%);
    line-height: 1.75;
    overflow-x: hidden;
}

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

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(219, 231, 245, 0.88);
}

.header-inner {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.brand,
.footer-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: 18px;
}

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

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

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

.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    padding: 12px;
    display: none;
    flex-direction: column;
    gap: 6px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}

.nav-toggle:checked ~ .site-nav {
    display: flex;
}

.site-nav a {
    padding: 12px 14px;
    border-radius: 12px;
    color: #334155;
    font-weight: 650;
    font-size: 15px;
}

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

.container {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}

.section {
    padding: 56px 0;
}

.section-tight {
    padding: 36px 0;
}

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

.section-kicker,
.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-dark);
    background: rgba(70,139,223,0.10);
    border: 1px solid rgba(70,139,223,0.16);
    border-radius: 999px;
    padding: 7px 12px;
    font-size: 13px;
    font-weight: 750;
}

h1,
h2,
h3 {
    line-height: 1.22;
    letter-spacing: -0.035em;
    margin: 0 0 14px;
}

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

h2 {
    font-size: clamp(25px, 5vw, 40px);
}

h3 {
    font-size: 20px;
}

p {
    margin: 0 0 14px;
    color: var(--muted);
}

.hero {
    padding: 58px 0 42px;
}

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

.hero-copy {
    max-width: 680px;
}

.hero-copy p {
    font-size: 17px;
}

.hero-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: 50px;
    padding: 0 24px;
    border-radius: 999px;
    background: rgb(70,139,223);
    color: #ffffff;
    font-weight: 800;
    font-size: 16px;
    box-shadow: 0 12px 26px rgba(70,139,223,0.26);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    border: 0;
    cursor: pointer;
}

.download-btn:hover {
    transform: translateY(-2px);
    background: #3c7ed0;
    box-shadow: 0 18px 34px rgba(70,139,223,0.32);
}

.sub-note {
    font-size: 13px;
    color: #708198;
}

.hero-badges,
.tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 18px 0 0;
}

.hero-visual {
    position: relative;
    border-radius: 32px;
    padding: 24px;
    background: linear-gradient(145deg, rgba(70,139,223,0.14), rgba(255,255,255,0.84));
    border: 1px solid rgba(70,139,223,0.16);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.hero-visual::before {
    content: "";
    position: absolute;
    inset: auto -30px -70px auto;
    width: 180px;
    height: 180px;
    background: rgba(70,139,223,0.17);
    filter: blur(12px);
    border-radius: 50%;
}

.app-image {
    position: relative;
    width: min(310px, 90%);
    margin: 0 auto;
    border-radius: 30px;
    filter: drop-shadow(0 24px 30px rgba(15, 39, 74, 0.18));
}

.stats {
    display: grid;
    gap: 12px;
    margin-top: 22px;
}

.stat-card {
    padding: 16px;
    background: rgba(255,255,255,0.72);
    border: 1px solid var(--line);
    border-radius: 18px;
}

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

.card,
.info-panel,
.faq-item,
.article-card {
    background: var(--card);
    border: 1px solid rgba(219, 231, 245, 0.92);
    border-radius: var(--radius-md);
    box-shadow: 0 12px 28px rgba(36, 95, 168, 0.08);
}

.card,
.article-card {
    padding: 22px;
}

.card-icon {
    width: 46px;
    height: 46px;
    display: grid;
    place-items: center;
    border-radius: 16px;
    color: var(--primary-dark);
    background: var(--primary-soft);
    font-weight: 900;
    margin-bottom: 14px;
}

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

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

.info-panel {
    padding: 24px;
    background: linear-gradient(135deg, #ffffff 0%, #eef6ff 100%);
}

.two-col {
    display: grid;
    gap: 22px;
    align-items: start;
}

.list-check {
    list-style: none;
    padding: 0;
    margin: 16px 0 0;
    display: grid;
    gap: 10px;
}

.list-check li {
    position: relative;
    padding-left: 30px;
    color: #475569;
}

.list-check li::before {
    content: "✓";
    position: absolute;
    left: 0;
    top: 0;
    width: 22px;
    height: 22px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-size: 13px;
    font-weight: 900;
}

.page-hero {
    padding: 50px 0 30px;
}

.page-hero-card {
    border-radius: 30px;
    padding: 30px;
    background: linear-gradient(135deg, rgba(70,139,223,0.12), rgba(255,255,255,0.94));
    border: 1px solid rgba(70,139,223,0.18);
}

.page-hero-card p {
    max-width: 820px;
}

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

.faq-item {
    padding: 20px;
}

.faq-item h2,
.faq-item h3 {
    font-size: 19px;
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.download-panel {
    text-align: center;
    padding: 30px 22px;
    border-radius: 28px;
    background: linear-gradient(135deg, rgba(70,139,223,0.14), rgba(255,255,255,0.96));
    border: 1px solid rgba(70,139,223,0.18);
    box-shadow: var(--shadow);
}

.steps {
    counter-reset: step;
    display: grid;
    gap: 14px;
    padding: 0;
    margin: 0;
    list-style: none;
}

.steps li {
    counter-increment: step;
    display: grid;
    grid-template-columns: 42px 1fr;
    gap: 14px;
    align-items: start;
    padding: 18px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
}

.steps li::before {
    content: counter(step);
    width: 42px;
    height: 42px;
    border-radius: 15px;
    display: grid;
    place-items: center;
    color: #fff;
    background: var(--primary);
    font-weight: 900;
}

.article-card .download-btn {
    margin-top: 10px;
}

.site-footer {
    margin-top: 50px;
    background: #0f223c;
    color: #d7e6fb;
    padding: 44px 0 0;
}

.footer-grid {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
    display: grid;
    gap: 28px;
}

.footer-brand img {
    width: 36px;
    height: 36px;
    border-radius: 12px;
}

.footer-brand span {
    color: #ffffff;
    font-size: 18px;
    font-weight: 850;
}

.site-footer p,
.site-footer a {
    color: #b8c8db;
}

.site-footer h2 {
    font-size: 17px;
    letter-spacing: -0.02em;
    color: #ffffff;
}

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

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

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.10);
    margin-top: 34px;
    padding: 18px 16px;
    text-align: center;
}

.footer-bottom p {
    margin: 0;
    font-size: 13px;
}

@media (min-width: 640px) {
    .stats {
        grid-template-columns: repeat(3, 1fr);
    }

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

    .page-hero-card,
    .download-panel {
        padding: 40px;
    }
}

@media (min-width: 900px) {
    .nav-toggle-label {
        display: none;
    }

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

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

    .hero {
        padding: 82px 0 56px;
    }

    .hero-grid {
        grid-template-columns: minmax(0, 1.05fr) minmax(330px, .95fr);
        gap: 54px;
    }

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

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

    .two-col {
        grid-template-columns: 1fr 1fr;
        gap: 28px;
    }

    .footer-grid {
        grid-template-columns: 1.25fr .8fr .8fr;
    }
}

@media (min-width: 1120px) {
    .card,
    .article-card {
        padding: 26px;
    }

    .section {
        padding: 72px 0;
    }
}