* {
    box-sizing: border-box;
}

:root {
    --primary: rgb(70,139,223);
    --primary-dark: #245fba;
    --primary-soft: #edf6ff;
    --text: #172033;
    --muted: #667085;
    --line: #e5edf7;
    --card: #ffffff;
    --bg: #f7fbff;
    --shadow: 0 18px 45px rgba(31, 92, 160, 0.10);
    --radius: 22px;
}

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(--text);
    background: linear-gradient(180deg, #f4f9ff 0%, #ffffff 42%, #f7fbff 100%);
    line-height: 1.72;
    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(16px);
    border-bottom: 1px solid rgba(220, 233, 249, 0.9);
}

.header-inner {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 18px;
    letter-spacing: -0.02em;
}

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

.nav-toggle {
    border: 1px solid var(--line);
    background: #fff;
    color: var(--primary-dark);
    border-radius: 999px;
    padding: 9px 14px;
    font-size: 14px;
}

.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 74px;
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}

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

.site-nav a {
    color: #364152;
    font-size: 15px;
    padding: 10px 12px;
    border-radius: 12px;
}

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

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

.hero {
    padding: 54px 0 34px;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    align-items: center;
}

.hero-copy {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.kicker,
.badge {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    color: var(--primary-dark);
    background: rgba(70,139,223,0.10);
    border: 1px solid rgba(70,139,223,0.18);
    padding: 7px 12px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
}

h1,
h2,
h3 {
    line-height: 1.22;
    color: #111827;
    margin: 0 0 14px;
    letter-spacing: -0.03em;
}

h1 {
    font-size: clamp(32px, 8vw, 58px);
    margin-top: 18px;
}

h2 {
    font-size: clamp(26px, 5vw, 38px);
}

h3 {
    font-size: 20px;
}

p {
    margin: 0 0 14px;
    color: #4b5565;
}

.lead {
    font-size: 17px;
    color: #475467;
    max-width: 680px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 26px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    font-size: 16px;
    border: 1px solid rgba(70,139,223,0.1);
    box-shadow: 0 14px 28px rgba(70,139,223,0.26);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    margin-top: 14px;
}

.download-btn:hover {
    transform: translateY(-1px);
    background: var(--primary-dark);
    box-shadow: 0 16px 34px rgba(70,139,223,0.32);
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 20px 0 6px;
}

.hero-tags span,
.mini-tag {
    display: inline-flex;
    align-items: center;
    color: #285d9f;
    background: #fff;
    border: 1px solid #d8e8fb;
    border-radius: 999px;
    padding: 7px 11px;
    font-size: 13px;
    font-weight: 700;
}

.hero-visual {
    position: relative;
    padding: 18px;
    border-radius: 32px;
    background: linear-gradient(145deg, #ffffff 0%, #eaf5ff 100%);
    box-shadow: var(--shadow);
    border: 1px solid rgba(70,139,223,0.13);
}

.hero-visual::after {
    content: "";
    position: absolute;
    width: 140px;
    height: 140px;
    border-radius: 50%;
    right: -42px;
    bottom: -38px;
    background: rgba(70,139,223,0.15);
    z-index: -1;
}

.app-shot {
    width: min(420px, 86%);
    margin: 0 auto;
    border-radius: 30px;
}

.section {
    padding: 42px 0;
}

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

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

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

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

.feature-card {
    padding: 22px;
    background: linear-gradient(180deg, #ffffff 0%, #f6fbff 100%);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: 0 12px 30px rgba(31, 92, 160, 0.08);
}

.icon-dot {
    width: 40px;
    height: 40px;
    border-radius: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: rgba(70,139,223,0.12);
    color: var(--primary-dark);
    font-weight: 900;
    margin-bottom: 12px;
}

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

.stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 18px;
}

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

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

.note-box {
    padding: 18px;
    border-radius: 20px;
    background: #eef6ff;
    border: 1px solid #d8e9fb;
    color: #315f91;
}

.page-hero {
    padding: 48px 0 22px;
}

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

.content-wrap {
    width: min(980px, calc(100% - 32px));
    margin: 0 auto;
    padding: 24px 0 52px;
}

.article-card {
    background: rgba(255,255,255,0.9);
    border: 1px solid var(--line);
    border-radius: 26px;
    box-shadow: var(--shadow);
    padding: 24px;
}

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

.article-card ul,
.article-card ol {
    margin: 10px 0 0;
    padding-left: 20px;
    color: #4b5565;
}

.article-card li {
    margin: 8px 0;
}

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

.faq-item {
    padding: 20px;
}

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

.cta-panel {
    margin-top: 22px;
    padding: 26px;
    border-radius: 28px;
    background: linear-gradient(135deg, rgba(70,139,223,0.12), rgba(255,255,255,0.96));
    border: 1px solid rgba(70,139,223,0.18);
    box-shadow: var(--shadow);
}

.step-card {
    padding: 20px;
}

.step-number {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    margin-bottom: 10px;
}

.site-footer {
    margin-top: 20px;
    background: #10233f;
    color: #dbe7f5;
}

.footer-inner {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
    padding: 34px 0;
    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;
}

.footer-logo {
    font-size: 20px;
    font-weight: 900;
    margin-bottom: 8px;
    color: #fff;
}

.footer-brand p {
    max-width: 520px;
    color: #b9c7d8;
}

.footer-links {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.footer-links a {
    color: #dbe7f5;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 12px;
    padding: 10px 12px;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.08);
    text-align: center;
    color: #9fb1c7;
    padding: 14px;
    font-size: 14px;
}

@media (min-width: 720px) {
    .hero {
        padding-top: 70px;
    }

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

    .article-card {
        padding: 30px;
    }

    .footer-inner {
        grid-template-columns: 1.2fr .8fr;
        align-items: start;
    }
}

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

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

    .site-nav a {
        padding: 8px 12px;
    }

    .hero-grid,
    .split {
        grid-template-columns: 1.05fr .95fr;
        gap: 52px;
    }

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

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

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

    .section {
        padding: 58px 0;
    }
}

@media (max-width: 420px) {
    .header-inner,
    .container,
    .section,
    .content-wrap,
    .footer-inner {
        width: min(100% - 24px, 1120px);
    }

    .download-btn {
        width: 100%;
    }

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