* {
    box-sizing: border-box;
}

:root {
    --primary: rgb(70,139,223);
    --primary-dark: #2565b5;
    --primary-soft: #eaf4ff;
    --deep: #13233a;
    --text: #30445f;
    --muted: #6b7f96;
    --line: rgba(70,139,223,.16);
    --white: #ffffff;
    --shadow: 0 18px 45px rgba(38, 94, 156, .10);
    --radius: 22px;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 15% 0%, rgba(70,139,223,.18), transparent 32%),
        linear-gradient(180deg, #f5fbff 0%, #ffffff 42%, #f6fbff 100%);
    line-height: 1.75;
    overflow-x: hidden;
}

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

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

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 30;
    background: rgba(255,255,255,.88);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(70,139,223,.12);
}

.nav-wrap {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: var(--deep);
    letter-spacing: .2px;
}

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

.nav-toggle {
    display: none;
}

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

.nav-toggle-label span {
    width: 20px;
    height: 2px;
    background: var(--deep);
    border-radius: 99px;
}

.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    display: none;
    flex-direction: column;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: rgba(255,255,255,.98);
    box-shadow: var(--shadow);
}

.site-nav a {
    padding: 12px 14px;
    border-radius: 14px;
    color: var(--text);
    font-size: 15px;
}

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

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

.hero {
    padding: 46px 0 38px;
}

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

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

.eyebrow,
.badge {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    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,.16);
    font-size: 13px;
    font-weight: 700;
}

h1,
h2,
h3 {
    color: var(--deep);
    line-height: 1.25;
    margin: 0;
}

h1 {
    font-size: clamp(32px, 8vw, 58px);
    letter-spacing: -1.2px;
}

h2 {
    font-size: clamp(24px, 5vw, 36px);
    letter-spacing: -.5px;
}

h3 {
    font-size: 19px;
}

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

.hero-tags,
.tag-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.hero-tags span,
.tag-row span {
    padding: 8px 12px;
    border-radius: 999px;
    background: var(--white);
    border: 1px solid var(--line);
    color: var(--text);
    font-size: 13px;
    box-shadow: 0 8px 22px rgba(70,139,223,.07);
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: fit-content;
    min-height: 48px;
    padding: 0 24px;
    border-radius: 999px;
    background: rgb(70,139,223);
    color: #fff;
    font-weight: 800;
    font-size: 16px;
    box-shadow: 0 14px 28px rgba(70,139,223,.28);
    transition: transform .2s ease, box-shadow .2s ease;
    border: 0;
}

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

.hero-visual {
    position: relative;
    min-height: 340px;
    display: grid;
    place-items: center;
}

.visual-card {
    width: min(390px, 100%);
    border-radius: 34px;
    padding: 22px;
    background: linear-gradient(155deg, rgba(255,255,255,.95), rgba(234,244,255,.82));
    border: 1px solid rgba(70,139,223,.16);
    box-shadow: var(--shadow);
}

.app-shot {
    width: min(260px, 82%);
    margin: 0 auto;
    filter: drop-shadow(0 24px 35px rgba(31,70,120,.18));
}

.float-panel {
    position: absolute;
    left: 0;
    bottom: 18px;
    width: 210px;
    padding: 14px;
    border-radius: 20px;
    background: rgba(255,255,255,.94);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.float-panel strong {
    display: block;
    color: var(--deep);
}

.float-panel small {
    color: var(--muted);
}

.section {
    padding: 38px 0;
}

.section-head {
    display: grid;
    gap: 10px;
    margin-bottom: 22px;
}

.section-head.center {
    text-align: center;
    justify-items: center;
}

.section-head p {
    max-width: 760px;
    color: var(--muted);
    margin: 0;
}

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

.cards-3,
.cards-2,
.article-grid {
    grid-template-columns: 1fr;
}

.card,
.info-card,
.faq-item,
.step-item,
.article-card,
.download-panel {
    background: rgba(255,255,255,.92);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

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

.card p,
.info-card p,
.article-card p,
.step-item p {
    margin: 10px 0 0;
    color: var(--muted);
}

.card-icon {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border-radius: 15px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
    margin-bottom: 14px;
}

.band {
    padding: 26px;
    border-radius: 28px;
    background:
        linear-gradient(135deg, rgba(70,139,223,.12), rgba(255,255,255,.96)),
        #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

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

.stats {
    display: grid;
    gap: 12px;
    margin-top: 18px;
}

.stat {
    padding: 18px;
    border-radius: 20px;
    background: rgba(255,255,255,.72);
    border: 1px solid rgba(70,139,223,.14);
}

.stat strong {
    display: block;
    font-size: 23px;
    color: var(--primary-dark);
}

.page-hero {
    padding: 46px 0 22px;
}

.page-hero .lead {
    max-width: 820px;
    margin-top: 16px;
}

.content-wrap {
    display: grid;
    gap: 18px;
}

.prose {
    background: rgba(255,255,255,.92);
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 24px;
    box-shadow: var(--shadow);
}

.prose p {
    margin: 0 0 16px;
}

.prose p:last-child {
    margin-bottom: 0;
}

.notice {
    padding: 18px;
    border-left: 4px solid var(--primary);
    border-radius: 18px;
    background: rgba(70,139,223,.09);
    color: var(--text);
}

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

.step-item {
    position: relative;
    padding: 20px 20px 20px 66px;
}

.step-item::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 20px;
    top: 20px;
    width: 32px;
    height: 32px;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    display: grid;
    place-items: center;
    font-weight: 800;
}

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

.faq-item {
    padding: 20px;
}

.faq-item h3 {
    margin-bottom: 8px;
}

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

.download-panel {
    padding: 26px;
    display: grid;
    gap: 14px;
    background:
        radial-gradient(circle at 100% 0%, rgba(70,139,223,.18), transparent 28%),
        rgba(255,255,255,.94);
}

.download-panel p {
    margin: 0;
    color: var(--muted);
}

.footer-brand {
    display: flex;
    gap: 10px;
    align-items: center;
    color: var(--deep);
}

.footer-brand img {
    width: 34px;
    height: 34px;
    border-radius: 11px;
}

.site-footer {
    margin-top: 40px;
    padding: 38px 0 24px;
    background: #f1f7ff;
    border-top: 1px solid var(--line);
}

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

.site-footer h3 {
    font-size: 16px;
    margin-bottom: 10px;
}

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

.site-footer p,
.footer-bottom {
    color: var(--muted);
    font-size: 14px;
}

.footer-bottom {
    margin-top: 26px;
    padding-top: 18px;
    border-top: 1px solid rgba(70,139,223,.14);
    display: grid;
    gap: 8px;
}

@media (min-width: 720px) {
    .container {
        width: min(1120px, calc(100% - 56px));
    }

    .cards-2,
    .article-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .download-panel {
        grid-template-columns: 1fr auto;
        align-items: center;
    }

    .footer-grid {
        grid-template-columns: 2fr 1fr 1fr;
    }

    .footer-bottom {
        grid-template-columns: 1fr 1fr;
    }
}

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

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

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

    .hero {
        padding: 72px 0 58px;
    }

    .hero-grid {
        grid-template-columns: 1.05fr .95fr;
        gap: 56px;
    }

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

    .content-wrap {
        grid-template-columns: minmax(0, 1fr) 330px;
        align-items: start;
    }

    .page-hero {
        padding-top: 70px;
    }

    .prose {
        padding: 32px;
    }
}

@media (max-width: 420px) {
    .container {
        width: min(100% - 24px, 1120px);
    }

    .hero {
        padding-top: 32px;
    }

    .download-btn {
        width: 100%;
    }

    .float-panel {
        position: static;
        width: 100%;
        margin-top: 14px;
    }

    .visual-card {
        border-radius: 26px;
    }

    .section {
        padding: 30px 0;
    }
}