:root {
    --primary: rgb(70,139,223);
    --primary-dark: #225d9f;
    --primary-soft: #eaf4ff;
    --primary-light: #f5fbff;
    --text: #162033;
    --muted: #65748a;
    --line: rgba(45, 94, 148, 0.14);
    --card: rgba(255, 255, 255, 0.92);
    --shadow: 0 18px 50px rgba(33, 87, 148, 0.12);
    --radius: 22px;
    --container: 1160px;
}

* {
    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(--text);
    background:
        radial-gradient(circle at top left, rgba(70,139,223,0.20), transparent 34rem),
        linear-gradient(180deg, #f6fbff 0%, #ffffff 42%, #f8fbff 100%);
    line-height: 1.7;
    overflow-x: hidden;
}

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

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

p {
    margin: 0 0 1rem;
    color: var(--muted);
}

h1, h2, h3 {
    margin: 0;
    color: var(--text);
    line-height: 1.25;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2rem, 8vw, 4.4rem);
}

h2 {
    font-size: clamp(1.55rem, 4vw, 2.5rem);
}

h3 {
    font-size: 1.12rem;
}

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.86);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
}

.nav-wrap {
    min-height: 70px;
    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(--primary-dark);
}

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

.brand-text {
    font-size: 1.05rem;
    letter-spacing: -0.01em;
}

.nav-toggle {
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fff;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    cursor: pointer;
}

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

.site-nav {
    position: absolute;
    top: 70px;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    padding: 12px;
    background: rgba(255,255,255,0.98);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}

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

.site-nav a {
    padding: 12px 14px;
    border-radius: 13px;
    color: #4d6077;
    font-weight: 650;
}

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

.hero {
    padding: 56px 0 38px;
}

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

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 999px;
    color: var(--primary-dark);
    background: rgba(70,139,223,0.12);
    font-weight: 750;
    font-size: 0.88rem;
    margin-bottom: 18px;
}

.hero p.lead,
.page-hero p {
    font-size: 1.06rem;
    color: #52657d;
    margin-top: 18px;
    max-width: 720px;
}

.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: 48px;
    padding: 0 24px;
    border-radius: 999px;
    background: rgb(70,139,223);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 32px rgba(70,139,223,0.28);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    border: 0;
    cursor: pointer;
    white-space: nowrap;
}

.download-btn:hover {
    transform: translateY(-2px);
    background: var(--primary-dark);
    box-shadow: 0 18px 38px rgba(70,139,223,0.34);
}

.hero-note {
    color: var(--muted);
    font-size: 0.94rem;
}

.tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 22px;
}

.tag,
.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    border-radius: 999px;
    background: #fff;
    border: 1px solid var(--line);
    color: #3d5570;
    font-size: 0.9rem;
    font-weight: 650;
}

.hero-visual {
    position: relative;
    padding: 16px;
}

.hero-visual::before {
    content: "";
    position: absolute;
    inset: 8% 3% 3% 16%;
    border-radius: 34px;
    background: linear-gradient(135deg, rgba(70,139,223,0.18), rgba(255,255,255,0.8));
    transform: rotate(-5deg);
    z-index: -1;
}

.app-card {
    background: rgba(255,255,255,0.78);
    border: 1px solid var(--line);
    border-radius: 32px;
    padding: 18px;
    box-shadow: var(--shadow);
}

.section {
    padding: 44px 0;
}

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

.section-head p {
    margin-top: 12px;
}

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

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

.card {
    padding: 22px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--card);
    box-shadow: 0 12px 34px rgba(41, 96, 158, 0.08);
}

.card h3 {
    margin-bottom: 8px;
}

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

.soft-card {
    background: linear-gradient(135deg, rgba(70,139,223,0.12), rgba(255,255,255,0.95));
}

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

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

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

.stat strong {
    display: block;
    color: var(--primary-dark);
    font-size: 1.4rem;
}

.stat span {
    color: var(--muted);
    font-size: 0.92rem;
}

.page-hero {
    padding: 52px 0 28px;
}

.page-hero .card {
    margin-top: 24px;
}

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

.article-main {
    display: grid;
    gap: 18px;
}

.tip-list {
    padding-left: 1.2rem;
    margin: 12px 0 0;
    color: var(--muted);
}

.tip-list li {
    margin: 8px 0;
}

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

.faq-item {
    padding: 20px;
    border-radius: 18px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: 0 10px 30px rgba(41, 96, 158, 0.06);
}

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

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

.step {
    position: relative;
    padding: 20px 20px 20px 66px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
}

.step::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 18px;
    top: 20px;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
}

.cta-panel {
    margin-top: 20px;
    padding: 24px;
    border-radius: 26px;
    background: linear-gradient(135deg, rgba(70,139,223,0.14), rgba(255,255,255,0.96));
    border: 1px solid var(--line);
    display: grid;
    gap: 16px;
}

.site-footer {
    margin-top: 44px;
    padding: 38px 0 24px;
    background: #0f2742;
    color: rgba(255,255,255,0.82);
}

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

.footer-brand {
    color: #fff;
    font-weight: 850;
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.site-footer p {
    color: rgba(255,255,255,0.68);
    max-width: 380px;
}

.site-footer h3 {
    color: #fff;
    margin-bottom: 10px;
}

.site-footer a {
    display: block;
    color: rgba(255,255,255,0.72);
    padding: 4px 0;
}

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

.footer-bottom {
    margin-top: 28px;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,0.12);
    display: flex;
    flex-direction: column;
    gap: 8px;
    color: rgba(255,255,255,0.58);
    font-size: 0.9rem;
}

@media (min-width: 700px) {
    .container {
        width: min(100% - 56px, var(--container));
    }

    .hero,
    .page-hero {
        padding-top: 74px;
    }

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

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

@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: 9px 12px;
        font-size: 0.95rem;
    }

    .hero-grid {
        grid-template-columns: 1.05fr 0.95fr;
        gap: 46px;
    }

    .hero {
        padding: 88px 0 48px;
    }

    .section {
        padding: 62px 0;
    }

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

    .split,
    .article-layout {
        grid-template-columns: 1.08fr 0.72fr;
        gap: 28px;
    }

    .footer-grid {
        grid-template-columns: 1.6fr repeat(3, 1fr);
    }

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