:root {
    --primary: rgb(70,139,223);
    --primary-dark: #245da8;
    --primary-soft: #edf6ff;
    --ink: #14213d;
    --muted: #5e6b82;
    --line: rgba(70, 139, 223, 0.16);
    --card: rgba(255, 255, 255, 0.92);
    --shadow: 0 18px 46px rgba(42, 87, 150, 0.12);
    --radius: 22px;
}

* {
    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 15% 8%, rgba(70,139,223,0.16), transparent 30%),
        radial-gradient(circle at 88% 20%, rgba(120,180,255,0.18), transparent 28%),
        linear-gradient(180deg, #f7fbff 0%, #eef6ff 48%, #ffffff 100%);
    line-height: 1.72;
    overflow-x: hidden;
}

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

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

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,0.84);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(16px);
}

.header-inner {
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

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

.brand-logo {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 28px rgba(70,139,223,0.22);
}

.brand-name {
    font-size: 18px;
}

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

.nav-toggle span {
    width: 18px;
    height: 2px;
    border-radius: 999px;
    background: var(--primary-dark);
}

.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 76px;
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: rgba(255,255,255,0.98);
    box-shadow: var(--shadow);
}

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

.site-nav a {
    padding: 10px 12px;
    border-radius: 14px;
    color: #31415e;
    font-size: 15px;
}

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

.hero {
    padding: 42px 0 34px;
}

.hero-grid {
    display: grid;
    gap: 28px;
    align-items: center;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--primary-dark);
    background: rgba(255,255,255,0.7);
    font-size: 13px;
    font-weight: 700;
}

h1, h2, h3 {
    margin: 0;
    line-height: 1.22;
    letter-spacing: -0.03em;
}

h1 {
    margin-top: 16px;
    font-size: clamp(34px, 9vw, 62px);
}

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

h3 {
    font-size: 19px;
}

.lead {
    margin: 18px 0 0;
    color: var(--muted);
    font-size: 17px;
}

.hero-actions {
    margin-top: 26px;
    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: 13px 22px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-size: 16px;
    font-weight: 800;
    box-shadow: 0 14px 30px rgba(70,139,223,0.28);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

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

.badges {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 20px;
}

.badge {
    padding: 8px 11px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: rgba(255,255,255,0.72);
    color: #35516e;
    font-size: 13px;
    font-weight: 700;
}

.hero-visual {
    position: relative;
    padding: 20px;
    border-radius: 30px;
    background: linear-gradient(145deg, rgba(255,255,255,0.78), rgba(232,244,255,0.92));
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.hero-visual::before {
    content: "";
    position: absolute;
    inset: 14px;
    border-radius: 24px;
    border: 1px dashed rgba(70,139,223,0.22);
    pointer-events: none;
}

.app-showcase {
    position: relative;
    z-index: 1;
    margin: 0 auto;
    max-width: 410px;
    filter: drop-shadow(0 24px 38px rgba(41, 89, 158, 0.22));
}

.section {
    padding: 42px 0;
}

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

.section-head p {
    margin: 12px 0 0;
    color: var(--muted);
}

.grid {
    display: grid;
    gap: 16px;
}

.card {
    padding: 22px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--card);
    box-shadow: 0 12px 32px rgba(42, 87, 150, 0.08);
}

.card p {
    margin: 10px 0 0;
    color: var(--muted);
}

.card ul,
.content-panel ul {
    margin: 12px 0 0;
    padding-left: 18px;
    color: var(--muted);
}

.card li,
.content-panel li {
    margin: 6px 0;
}

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

.icon {
    width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
    margin-bottom: 12px;
}

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

.content-panel {
    padding: 24px;
    border-radius: 26px;
    background: rgba(255,255,255,0.86);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.content-panel p {
    color: var(--muted);
}

.stats {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    margin-top: 20px;
}

.stat {
    padding: 16px;
    border-radius: 18px;
    background: #fff;
    border: 1px solid var(--line);
}

.stat strong {
    display: block;
    color: var(--primary-dark);
    font-size: 24px;
}

.stat span {
    color: var(--muted);
    font-size: 13px;
}

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

.faq-item {
    padding: 20px;
    border-radius: 20px;
    background: rgba(255,255,255,0.9);
    border: 1px solid var(--line);
}

.faq-item h2,
.faq-item h3 {
    font-size: 18px;
}

.faq-item p {
    margin: 10px 0 0;
    color: var(--muted);
}

.page-hero {
    padding: 44px 0 26px;
}

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

.cta-panel {
    margin-top: 24px;
    padding: 24px;
    border-radius: 26px;
    border: 1px solid rgba(70,139,223,0.22);
    background: linear-gradient(135deg, rgba(70,139,223,0.12), rgba(255,255,255,0.92));
    box-shadow: var(--shadow);
}

.steps {
    counter-reset: step;
    display: grid;
    gap: 14px;
}

.step {
    position: relative;
    padding: 18px 18px 18px 60px;
    border-radius: 20px;
    background: #fff;
    border: 1px solid var(--line);
}

.step::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 18px;
    top: 18px;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    display: grid;
    place-items: center;
    font-weight: 800;
}

.notice {
    padding: 18px;
    border-radius: 20px;
    background: #f6fbff;
    border: 1px solid var(--line);
    color: #35516e;
}

.table-like {
    display: grid;
    gap: 10px;
}

.table-row {
    display: grid;
    gap: 6px;
    padding: 14px;
    border-radius: 16px;
    background: #fff;
    border: 1px solid var(--line);
}

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

.site-footer {
    margin-top: 36px;
    padding: 36px 0 22px;
    background: rgba(255,255,255,0.78);
    border-top: 1px solid var(--line);
}

.footer-grid {
    display: grid;
    gap: 22px;
}

.footer-brand {
    font-size: 18px;
    font-weight: 900;
}

.site-footer p {
    margin: 10px 0 0;
    color: var(--muted);
}

.site-footer h2 {
    margin-bottom: 8px;
    font-size: 15px;
    letter-spacing: 0;
}

.site-footer a {
    display: block;
    color: var(--muted);
    margin: 7px 0;
    font-size: 14px;
}

.footer-bottom {
    margin-top: 28px;
    padding-top: 16px;
    border-top: 1px solid var(--line);
    display: flex;
    flex-direction: column;
    gap: 8px;
    color: var(--muted);
    font-size: 13px;
}

@media (min-width: 680px) {
    .container {
        width: min(1120px, calc(100% - 56px));
    }

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

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

    .table-row {
        grid-template-columns: 180px 1fr;
        align-items: start;
    }
}

@media (min-width: 960px) {
    .nav-toggle {
        display: none;
    }

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

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

    .hero {
        padding: 72px 0 54px;
    }

    .hero-grid,
    .split {
        grid-template-columns: minmax(0, 1.05fr) minmax(360px, .95fr);
    }

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

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

    .section {
        padding: 58px 0;
    }

    .footer-grid {
        grid-template-columns: 1.4fr .8fr .8fr .8fr;
    }

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