* {
    box-sizing: border-box;
}

:root {
    --primary: rgb(70,139,223);
    --primary-dark: rgb(38,96,170);
    --primary-soft: rgb(232,243,255);
    --text: #18243a;
    --muted: #607087;
    --line: rgba(70,139,223,.16);
    --card: rgba(255,255,255,.88);
    --shadow: 0 18px 45px rgba(38,96,170,.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:
        radial-gradient(circle at 20% 0%, rgba(70,139,223,.20), transparent 28rem),
        linear-gradient(180deg, #f7fbff 0%, #eef6ff 42%, #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: 50;
    background: rgba(255,255,255,.86);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(70,139,223,.12);
}

.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 {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: .02em;
}

.brand-logo,
.footer-logo {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    box-shadow: 0 10px 24px rgba(70,139,223,.18);
}

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

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

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

.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 76px;
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 14px;
    background: rgba(255,255,255,.96);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}

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

.nav-link {
    padding: 10px 12px;
    border-radius: 12px;
    color: #40516a;
    font-size: 15px;
}

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

.site-main {
    min-height: 70vh;
}

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

.hero {
    padding: 52px 0 34px;
    display: grid;
    gap: 32px;
}

.hero-copy,
.hero-visual,
.page-hero,
.section,
.content-card,
.info-card,
.faq-item,
.step-item,
.notice-card {
    position: relative;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 999px;
    color: var(--primary-dark);
    background: rgba(70,139,223,.10);
    border: 1px solid rgba(70,139,223,.14);
    font-size: 13px;
    font-weight: 700;
}

h1,
h2,
h3 {
    line-height: 1.25;
    margin: 0 0 14px;
    letter-spacing: -.03em;
}

h1 {
    font-size: clamp(32px, 9vw, 58px);
}

h2 {
    font-size: clamp(24px, 6vw, 36px);
}

h3 {
    font-size: 20px;
}

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

.lead {
    font-size: 17px;
    color: #41536c;
}

.hero-actions,
.cta-row {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    margin-top: 22px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 28px rgba(70,139,223,.26);
    transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
    border: 0;
    cursor: pointer;
}

.download-btn:hover {
    transform: translateY(-2px);
    background: var(--primary-dark);
    box-shadow: 0 18px 36px rgba(70,139,223,.32);
}

.text-link {
    color: var(--primary-dark);
    font-weight: 700;
}

.badge-list {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin: 20px 0 0;
    padding: 0;
    list-style: none;
}

.badge-list li,
.badge {
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,.80);
    border: 1px solid var(--line);
    color: #40516a;
    font-size: 13px;
    box-shadow: 0 10px 24px rgba(70,139,223,.08);
}

.hero-visual {
    padding: 22px;
    border-radius: 30px;
    background: linear-gradient(145deg, rgba(255,255,255,.92), rgba(235,246,255,.86));
    border: 1px solid rgba(70,139,223,.16);
    box-shadow: var(--shadow);
}

.app-frame {
    border-radius: 28px;
    padding: 18px;
    background:
        linear-gradient(180deg, rgba(70,139,223,.10), rgba(255,255,255,.98));
    overflow: hidden;
}

.app-frame img {
    width: min(320px, 88%);
    margin: 0 auto;
    filter: drop-shadow(0 28px 38px rgba(38,96,170,.16));
}

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

.metric {
    background: rgba(255,255,255,.84);
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 12px;
    text-align: center;
}

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

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

.section {
    padding: 34px 0;
}

.section-head {
    max-width: 720px;
    margin-bottom: 22px;
}

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

.card,
.content-card,
.info-card,
.faq-item,
.step-item,
.notice-card {
    background: var(--card);
    border: 1px solid rgba(70,139,223,.13);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: 0 14px 34px rgba(38,96,170,.08);
}

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

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

.panel-blue {
    background: linear-gradient(145deg, rgba(70,139,223,.12), rgba(255,255,255,.92));
}

.page-hero {
    padding: 46px 0 18px;
}

.page-hero .content-card {
    overflow: hidden;
}

.page-hero .content-card::after,
.hero-visual::after {
    content: "";
    position: absolute;
    width: 180px;
    height: 180px;
    border-radius: 50%;
    right: -70px;
    top: -70px;
    background: rgba(70,139,223,.12);
    pointer-events: none;
}

.breadcrumb {
    display: inline-flex;
    margin-bottom: 14px;
    color: var(--primary-dark);
    font-size: 14px;
    font-weight: 700;
}

.notice-card {
    border-left: 4px solid var(--primary);
    background: linear-gradient(90deg, rgba(70,139,223,.10), rgba(255,255,255,.92));
}

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

.steps-grid {
    counter-reset: step;
}

.step-item::before {
    counter-increment: step;
    content: counter(step);
    width: 34px;
    height: 34px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    margin-bottom: 12px;
}

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

.check-list li {
    padding-left: 28px;
    position: relative;
    color: #465971;
}

.check-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 7px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: inset 0 0 0 5px rgba(255,255,255,.82);
}

.cta-section {
    width: min(1120px, calc(100% - 32px));
    margin: 36px auto 54px;
    padding: 26px;
    border-radius: 28px;
    background: linear-gradient(135deg, rgba(70,139,223,.14), rgba(255,255,255,.96));
    border: 1px solid rgba(70,139,223,.16);
    box-shadow: var(--shadow);
}

.site-footer {
    margin-top: 24px;
    background: #f7fbff;
    border-top: 1px solid rgba(70,139,223,.14);
}

.footer-inner {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
    padding: 28px 0;
    display: grid;
    gap: 18px;
}

.footer-brand {
    display: flex;
    gap: 12px;
    align-items: center;
}

.footer-brand p,
.footer-bottom p {
    margin: 0;
    font-size: 14px;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 16px;
}

.footer-links a {
    color: #4d6078;
    font-size: 14px;
}

.footer-links a:hover {
    color: var(--primary-dark);
}

.footer-bottom {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
    padding: 16px 0 28px;
    border-top: 1px solid rgba(70,139,223,.10);
}

@media (min-width: 680px) {
    .feature-grid,
    .guide-grid,
    .faq-grid,
    .steps-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .hero {
        padding-top: 70px;
    }

    .cta-section {
        padding: 34px;
    }
}

@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;
    }

    .nav-link {
        padding: 8px 12px;
    }

    .hero {
        grid-template-columns: 1.05fr .95fr;
        align-items: center;
        gap: 52px;
        padding-bottom: 58px;
    }

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

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

    .footer-inner {
        grid-template-columns: 1fr auto;
        align-items: center;
    }

    .page-hero {
        padding-top: 68px;
    }
}