:root {
    --primary: rgb(70,139,223);
    --primary-dark: #245fa8;
    --primary-soft: #eef6ff;
    --primary-line: #d8eaff;
    --text: #17243a;
    --muted: #66758c;
    --card: #ffffff;
    --bg: #f8fbff;
    --shadow: 0 14px 40px rgba(38, 91, 160, 0.10);
    --radius: 22px;
}

* {
    box-sizing: border-box;
}

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: linear-gradient(180deg, #f3f8ff 0%, #ffffff 42%, #f8fbff 100%);
    line-height: 1.75;
    font-size: 16px;
    overflow-x: hidden;
}

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

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,0.92);
    border-bottom: 1px solid rgba(216,234,255,0.9);
    backdrop-filter: blur(14px);
}

.nav-wrap {
    max-width: 1180px;
    margin: 0 auto;
    padding: 12px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: #17345c;
    letter-spacing: -0.02em;
    white-space: nowrap;
}

.logo {
    width: 40px;
    height: 40px;
    border-radius: 12px;
}

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

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

.main-nav {
    position: absolute;
    top: 68px;
    left: 14px;
    right: 14px;
    display: none;
    flex-direction: column;
    padding: 14px;
    background: #fff;
    border: 1px solid var(--primary-line);
    border-radius: 20px;
    box-shadow: var(--shadow);
}

.main-nav.show {
    display: flex;
}

.main-nav a {
    padding: 12px 14px;
    color: #40506a;
    border-radius: 12px;
    font-size: 15px;
}

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

.page-main {
    width: 100%;
}

.container,
.hero-inner,
.footer-inner {
    width: min(100% - 36px, 1180px);
    margin: 0 auto;
}

.hero {
    position: relative;
    padding: 52px 0 38px;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    inset: -20% -15% auto auto;
    width: 420px;
    height: 420px;
    background: radial-gradient(circle, rgba(70,139,223,0.20), rgba(70,139,223,0));
    pointer-events: none;
}

.hero-inner {
    display: grid;
    grid-template-columns: 1fr;
    gap: 28px;
    align-items: center;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 999px;
    color: var(--primary-dark);
    background: #eaf4ff;
    font-weight: 700;
    font-size: 13px;
}

h1,
h2,
h3 {
    line-height: 1.25;
    margin: 0 0 14px;
    color: #14233a;
    letter-spacing: -0.03em;
}

h1 {
    font-size: clamp(32px, 8vw, 58px);
    margin-top: 18px;
}

h2 {
    font-size: clamp(26px, 4vw, 38px);
}

h3 {
    font-size: 20px;
}

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

.lead {
    color: #4c5c72;
    font-size: 18px;
    max-width: 720px;
}

.hero-actions,
.cta-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 24px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 12px 26px rgba(70,139,223,0.24);
    border: 1px solid rgba(70,139,223,0.15);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    cursor: pointer;
}

.download-btn:hover {
    transform: translateY(-2px);
    background: #3f82d5;
    box-shadow: 0 16px 34px rgba(70,139,223,0.28);
}

.support-text {
    color: #77859a;
    font-size: 14px;
}

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

.badge {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,0.82);
    border: 1px solid var(--primary-line);
    color: #375778;
    font-size: 13px;
    font-weight: 700;
}

.hero-visual {
    position: relative;
    padding: 16px;
    border-radius: 30px;
    background: linear-gradient(145deg, rgba(255,255,255,0.86), rgba(235,245,255,0.92));
    border: 1px solid rgba(216,234,255,0.95);
    box-shadow: var(--shadow);
}

.hero-visual img {
    margin: 0 auto;
    border-radius: 26px;
}

.metric-strip {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    margin-top: 20px;
}

.metric {
    padding: 16px;
    border-radius: 20px;
    background: #fff;
    border: 1px solid var(--primary-line);
}

.metric strong {
    display: block;
    font-size: 22px;
    color: var(--primary-dark);
}

.section {
    padding: 42px 0;
}

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

.section-heading.center {
    text-align: center;
    margin-left: auto;
    margin-right: auto;
}

.grid,
.feature-grid,
.info-grid,
.article-grid,
.steps {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.card,
.feature-card,
.info-card,
.faq-item,
.step-card,
.notice-card,
.article-card {
    background: var(--card);
    border: 1px solid var(--primary-line);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: 0 10px 30px rgba(41, 94, 161, 0.07);
}

.feature-card,
.info-card,
.step-card {
    min-height: 100%;
}

.icon-dot {
    width: 42px;
    height: 42px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--primary), #9fcaff);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 900;
    margin-bottom: 14px;
}

.soft-panel {
    background: linear-gradient(145deg, #eef6ff 0%, #ffffff 100%);
    border: 1px solid var(--primary-line);
    border-radius: 28px;
    padding: 24px;
    box-shadow: var(--shadow);
}

.two-col {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    align-items: start;
}

.check-list,
.clean-list {
    list-style: none;
    padding: 0;
    margin: 14px 0 0;
}

.check-list li,
.clean-list li {
    position: relative;
    padding-left: 30px;
    margin: 10px 0;
    color: #58697f;
}

.check-list li::before,
.clean-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 9px;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 0 5px rgba(70,139,223,0.12);
}

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

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

.page-hero {
    padding: 46px 0 30px;
}

.page-hero .container {
    background: linear-gradient(135deg, #eef6ff 0%, #ffffff 74%);
    border: 1px solid var(--primary-line);
    border-radius: 30px;
    padding: 28px;
    box-shadow: var(--shadow);
}

.article-body {
    max-width: 900px;
}

.article-body p {
    font-size: 17px;
}

.cta-box {
    margin-top: 18px;
    background: linear-gradient(135deg, rgba(70,139,223,0.10), rgba(255,255,255,0.96));
    border: 1px solid var(--primary-line);
    border-radius: 26px;
    padding: 24px;
}

.site-footer {
    margin-top: 34px;
    background: #f0f7ff;
    border-top: 1px solid var(--primary-line);
}

.footer-inner {
    padding: 34px 0 24px;
    display: grid;
    gap: 20px;
}

.footer-brand {
    display: grid;
    grid-template-columns: 48px 1fr;
    gap: 14px;
    align-items: start;
}

.footer-logo {
    width: 48px;
    height: 48px;
    border-radius: 14px;
}

.footer-brand strong {
    display: block;
    margin-bottom: 4px;
    color: #17345c;
}

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

.footer-links a {
    padding: 8px 12px;
    border-radius: 999px;
    color: #3f5877;
    background: #fff;
    border: 1px solid var(--primary-line);
    font-size: 14px;
}

.footer-bottom {
    width: min(100% - 36px, 1180px);
    margin: 0 auto;
    padding: 0 0 26px;
    color: #7a8ca3;
    font-size: 13px;
}

@media (min-width: 640px) {
    .metric-strip,
    .steps {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .page-hero .container {
        padding: 36px;
    }
}

@media (min-width: 960px) {
    body {
        font-size: 17px;
    }

    .nav-toggle {
        display: none;
    }

    .main-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        justify-content: flex-end;
        padding: 0;
        background: transparent;
        border: 0;
        border-radius: 0;
        box-shadow: none;
        gap: 2px;
    }

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

    .hero {
        padding: 82px 0 58px;
    }

    .hero-inner {
        grid-template-columns: minmax(0, 1.08fr) minmax(340px, 0.92fr);
        gap: 46px;
    }

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

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

    .two-col {
        grid-template-columns: minmax(0, 1fr) minmax(320px, 0.75fr);
        gap: 28px;
    }

    .section {
        padding: 62px 0;
    }

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

@media (min-width: 1180px) {
    .main-nav a {
        padding: 9px 15px;
    }
}