* {
    box-sizing: border-box;
}

:root {
    --primary: rgb(70,139,223);
    --primary-dark: rgb(33,88,158);
    --primary-soft: rgb(232,243,255);
    --text: #172033;
    --muted: #607086;
    --line: #dbe8f7;
    --surface: #ffffff;
    --surface-soft: #f7fbff;
    --shadow: 0 18px 45px rgba(42, 92, 150, 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, #f3f8ff 0%, #ffffff 42%, #f8fbff 100%);
    line-height: 1.75;
    overflow-x: hidden;
}

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

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

.container {
    width: min(100% - 32px, 1160px);
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(210, 226, 247, 0.85);
}

.header-inner {
    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;
    color: var(--primary-dark);
    letter-spacing: 0.01em;
}

.brand-logo {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(70, 139, 223, 0.18);
}

.brand-text {
    font-size: 1.02rem;
    white-space: nowrap;
}

.nav-toggle {
    border: 1px solid var(--line);
    background: #fff;
    color: var(--primary-dark);
    border-radius: 999px;
    padding: 9px 14px;
    font-weight: 700;
    cursor: pointer;
}

.site-nav {
    position: absolute;
    top: 68px;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    gap: 8px;
    padding: 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}

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

.site-nav a {
    color: var(--muted);
    font-weight: 700;
    padding: 11px 12px;
    border-radius: 14px;
}

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

main {
    min-height: 60vh;
}

.hero {
    padding: 42px 0 36px;
}

.hero-grid {
    display: grid;
    gap: 30px;
    align-items: center;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-dark);
    background: rgba(70, 139, 223, 0.10);
    border: 1px solid rgba(70, 139, 223, 0.20);
    border-radius: 999px;
    padding: 7px 12px;
    font-size: 0.88rem;
    font-weight: 800;
}

h1,
h2,
h3 {
    line-height: 1.25;
    margin: 0 0 16px;
}

h1 {
    font-size: clamp(2rem, 8vw, 4.8rem);
    letter-spacing: -0.04em;
}

h2 {
    font-size: clamp(1.55rem, 5vw, 2.45rem);
    letter-spacing: -0.025em;
}

h3 {
    font-size: 1.18rem;
}

p {
    margin: 0 0 16px;
    color: var(--muted);
}

.lead {
    font-size: 1.05rem;
    color: #435269;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: center;
    margin: 24px 0 18px;
}

.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 30px rgba(70, 139, 223, 0.25);
    transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
    cursor: pointer;
    border: none;
}

.download-btn:hover {
    transform: translateY(-1px);
    background: var(--primary-dark);
    box-shadow: 0 18px 36px rgba(70, 139, 223, 0.30);
}

.trust-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 0;
    margin: 14px 0 0;
    list-style: none;
}

.trust-tags li {
    padding: 8px 12px;
    border-radius: 999px;
    background: #fff;
    border: 1px solid var(--line);
    color: #40526b;
    font-weight: 700;
    font-size: 0.9rem;
}

.phone-card {
    position: relative;
    padding: 20px;
    border-radius: 28px;
    background: linear-gradient(145deg, #ffffff, #eaf4ff);
    box-shadow: var(--shadow);
    border: 1px solid rgba(255, 255, 255, 0.9);
}

.phone-card::before {
    content: "";
    position: absolute;
    inset: 14px;
    border-radius: 24px;
    border: 1px solid rgba(70, 139, 223, 0.14);
    pointer-events: none;
}

.phone-card img {
    margin: 0 auto;
    max-height: 520px;
    object-fit: contain;
}

.section {
    padding: 42px 0;
}

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

.card-grid,
.feature-grid,
.steps-grid,
.article-grid,
.stats-grid {
    display: grid;
    gap: 16px;
}

.card,
.feature-card,
.info-card,
.faq-item,
.step-card,
.stat-card,
.notice-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: 0 12px 34px rgba(42, 92, 150, 0.07);
}

.feature-card {
    background: linear-gradient(180deg, #ffffff 0%, #f6fbff 100%);
}

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

.panel {
    border-radius: 28px;
    padding: 24px;
    background: linear-gradient(135deg, rgba(70, 139, 223, 0.10), rgba(255, 255, 255, 0.95));
    border: 1px solid rgba(70, 139, 223, 0.18);
}

.split {
    display: grid;
    gap: 20px;
    align-items: center;
}

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

.check-list li,
.clean-list li {
    position: relative;
    padding-left: 28px;
    color: #4d5f78;
}

.check-list li::before,
.clean-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    top: 0;
    color: var(--primary);
    font-weight: 900;
}

.page-hero {
    padding: 42px 0 22px;
}

.page-hero .container {
    max-width: 920px;
}

.breadcrumb {
    color: var(--primary-dark);
    font-weight: 800;
    margin-bottom: 12px;
}

.article {
    padding: 22px 0 56px;
}

.article-body {
    display: grid;
    gap: 20px;
}

.article-body .download-btn {
    width: fit-content;
}

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

.faq-item h2,
.faq-item h3 {
    font-size: 1.08rem;
    margin-bottom: 8px;
}

.step-number {
    width: 34px;
    height: 34px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 900;
    margin-bottom: 12px;
}

.stat-card strong {
    display: block;
    color: var(--primary-dark);
    font-size: 1.7rem;
    margin-bottom: 4px;
}

.cta-band {
    margin: 20px 0 0;
    border-radius: 28px;
    padding: 24px;
    background: linear-gradient(135deg, var(--primary), rgb(117, 178, 239));
    color: #fff;
    box-shadow: 0 18px 45px rgba(70, 139, 223, 0.23);
}

.cta-band p,
.cta-band h2 {
    color: #fff;
}

.site-footer {
    padding: 42px 0 24px;
    background: #0f2138;
    color: #dce8f8;
}

.site-footer p,
.site-footer a,
.footer-bottom span {
    color: #aebed3;
}

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

.footer-brand {
    font-size: 1.15rem;
    font-weight: 900;
    margin-bottom: 10px;
    color: #fff;
}

.site-footer h2 {
    font-size: 1rem;
    color: #fff;
    margin-bottom: 10px;
}

.site-footer a {
    display: block;
    margin: 7px 0;
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 26px;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,0.12);
    font-size: 0.9rem;
}

@media (min-width: 680px) {
    .container {
        width: min(100% - 48px, 1160px);
    }

    .hero {
        padding: 64px 0 52px;
    }

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

    .footer-grid {
        grid-template-columns: 1.5fr 1fr 1fr 1fr;
    }

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

@media (min-width: 920px) {
    .nav-toggle {
        display: none;
    }

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

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

    .hero-grid,
    .split {
        grid-template-columns: 1.08fr 0.92fr;
    }

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

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

    .article-body {
        grid-template-columns: 1.1fr 0.9fr;
        align-items: start;
    }

    .article-copy {
        padding-right: 12px;
    }

    .section {
        padding: 64px 0;
    }

    .page-hero {
        padding: 62px 0 26px;
    }
}

@media (min-width: 1120px) {
    .hero {
        padding: 78px 0 64px;
    }

    .brand-text {
        font-size: 1.1rem;
    }
}