:root {
    --primary: rgb(70,139,223);
    --primary-dark: #1f5fae;
    --primary-soft: #eef6ff;
    --primary-light: #dcecff;
    --ink: #11243d;
    --muted: #60718a;
    --line: #dbe7f5;
    --card: rgba(255,255,255,.92);
    --white: #ffffff;
    --shadow: 0 18px 45px rgba(31, 95, 174, .12);
    --radius: 22px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    min-width: 320px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    color: var(--ink);
    background:
        radial-gradient(circle at top left, rgba(70,139,223,.16), transparent 34rem),
        linear-gradient(180deg, #f5faff 0%, #ffffff 45%, #f8fbff 100%);
    line-height: 1.75;
    overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
p { margin: 0 0 1rem; color: var(--muted); }
strong { color: var(--ink); }

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.88);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(219,231,245,.76);
}
.header-inner {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: .02em;
    color: var(--ink);
    white-space: nowrap;
}
.brand-logo {
    width: 38px;
    height: 38px;
    border-radius: 12px;
}
.brand-text { font-size: 1.02rem; }

.nav-toggle { display: none; }
.nav-toggle-label {
    width: 44px;
    height: 44px;
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fff;
}
.nav-toggle-label span {
    width: 18px;
    height: 2px;
    border-radius: 99px;
    background: var(--ink);
}
.site-nav {
    position: absolute;
    top: 68px;
    left: 16px;
    right: 16px;
    display: none;
    padding: 10px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}
.nav-toggle:checked ~ .site-nav { display: grid; }
.site-nav a {
    padding: 12px 14px;
    color: var(--muted);
    border-radius: 13px;
    font-size: .96rem;
    font-weight: 600;
}
.site-nav a.active,
.site-nav a:hover {
    color: var(--primary-dark);
    background: var(--primary-soft);
}

.site-main { min-height: 68vh; }
.hero,
.page-hero {
    padding: 56px 0 34px;
}
.hero-grid {
    display: grid;
    gap: 32px;
    align-items: center;
}
.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(70,139,223,.1);
    color: var(--primary-dark);
    font-size: .88rem;
    font-weight: 700;
}
h1,
h2,
h3 { margin: 0; line-height: 1.22; color: var(--ink); }
h1 {
    font-size: clamp(2rem, 7vw, 4.3rem);
    letter-spacing: -.05em;
}
h2 {
    font-size: clamp(1.55rem, 4.6vw, 2.5rem);
    letter-spacing: -.035em;
}
h3 { font-size: 1.15rem; }
.lead {
    margin-top: 18px;
    font-size: clamp(1rem, 2.5vw, 1.18rem);
    color: #4d6079;
}
.hero-actions,
.section-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: var(--primary);
    color: #fff;
    font-weight: 800;
    letter-spacing: .02em;
    box-shadow: 0 12px 28px rgba(70,139,223,.28);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    touch-action: manipulation;
}
.download-btn:hover {
    transform: translateY(-2px);
    background: var(--primary-dark);
    box-shadow: 0 16px 34px rgba(70,139,223,.32);
}
.note-inline { color: var(--muted); font-size: .94rem; }

.badge-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 22px;
}
.badge {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 0 12px;
    border: 1px solid rgba(70,139,223,.18);
    border-radius: 999px;
    background: rgba(255,255,255,.78);
    color: var(--primary-dark);
    font-size: .88rem;
    font-weight: 700;
}
.product-card {
    position: relative;
    padding: 22px;
    border-radius: 30px;
    background: linear-gradient(145deg, rgba(255,255,255,.98), rgba(233,244,255,.82));
    border: 1px solid rgba(70,139,223,.16);
    box-shadow: var(--shadow);
    overflow: hidden;
}
.product-card::before {
    content: "";
    position: absolute;
    inset: auto -45px -70px auto;
    width: 220px;
    height: 220px;
    background: rgba(70,139,223,.12);
    border-radius: 999px;
}
.product-visual {
    position: relative;
    width: min(86%, 360px);
    margin: 0 auto;
    filter: drop-shadow(0 26px 34px rgba(42,96,170,.18));
}
.metric-grid {
    display: grid;
    gap: 12px;
    grid-template-columns: repeat(3, 1fr);
    margin-top: 18px;
}
.metric {
    padding: 14px 10px;
    border-radius: 18px;
    background: rgba(255,255,255,.8);
    border: 1px solid rgba(219,231,245,.9);
    text-align: center;
}
.metric strong { display: block; font-size: 1.1rem; }
.metric span { color: var(--muted); font-size: .82rem; }

.section {
    padding: 38px 0;
}
.section-head {
    max-width: 760px;
    margin-bottom: 22px;
}
.section-head.center { text-align: center; margin-left: auto; margin-right: auto; }
.section-head p { margin-top: 12px; }
.card,
.guide-card,
.tip-card,
.faq-item,
.step-card {
    background: var(--card);
    border: 1px solid rgba(219,231,245,.9);
    border-radius: var(--radius);
    box-shadow: 0 12px 32px rgba(31,95,174,.08);
}
.card { padding: 22px; }
.card h3,
.guide-card h3,
.tip-card h3,
.step-card h3 { margin-bottom: 10px; }
.card p:last-child,
.guide-card p:last-child,
.tip-card p:last-child,
.step-card p:last-child,
.faq-item p:last-child { margin-bottom: 0; }
.feature-grid,
.card-grid,
.article-grid,
.steps-grid,
.scenario-grid {
    display: grid;
    gap: 16px;
}
.icon-bubble {
    width: 44px;
    height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
    border-radius: 16px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
}

.split {
    display: grid;
    gap: 18px;
    align-items: start;
}
.info-panel {
    padding: 24px;
    border-radius: 26px;
    background: linear-gradient(160deg, #eef6ff, #ffffff);
    border: 1px solid rgba(70,139,223,.16);
}
.check-list {
    display: grid;
    gap: 12px;
    margin: 18px 0 0;
    padding: 0;
    list-style: none;
}
.check-list li {
    position: relative;
    padding-left: 28px;
    color: var(--muted);
}
.check-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    top: 0;
    color: var(--primary-dark);
    font-weight: 900;
}

.faq-list {
    display: grid;
    gap: 14px;
}
.faq-item { padding: 20px; }
.faq-item h2,
.faq-item h3 {
    margin-bottom: 8px;
    font-size: 1.08rem;
}
.steps-grid { counter-reset: step; }
.step-card {
    position: relative;
    padding: 22px;
}
.step-card::before {
    counter-increment: step;
    content: counter(step);
    display: inline-flex;
    width: 34px;
    height: 34px;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    font-weight: 900;
}
.article-content {
    padding: 28px 0 16px;
}
.article-content .container {
    max-width: 920px;
}
.article-panel {
    padding: 24px;
    border-radius: 28px;
    background: rgba(255,255,255,.82);
    border: 1px solid rgba(219,231,245,.92);
    box-shadow: var(--shadow);
}
.article-panel p { font-size: 1rem; }
.article-panel .download-btn { margin-top: 12px; }
.tip-card {
    margin-top: 20px;
    padding: 22px;
    background: linear-gradient(150deg, #f4f9ff, #ffffff);
}
.tip-list {
    margin: 12px 0 0;
    padding-left: 18px;
    color: var(--muted);
}
.tip-list li { margin: 8px 0; }

.download-panel {
    display: grid;
    gap: 18px;
    padding: 24px;
    border-radius: 30px;
    background: linear-gradient(135deg, rgba(70,139,223,.12), rgba(255,255,255,.92));
    border: 1px solid rgba(70,139,223,.18);
    box-shadow: var(--shadow);
}
.download-panel .download-btn { justify-self: start; }

.site-footer {
    margin-top: 40px;
    padding: 40px 0 22px;
    background: #0f223a;
    color: rgba(255,255,255,.76);
}
.footer-grid {
    display: grid;
    gap: 24px;
}
.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    color: #fff;
}
.footer-brand img { width: 34px; height: 34px; border-radius: 11px; }
.site-footer h3 {
    margin-bottom: 10px;
    color: #fff;
    font-size: 1rem;
}
.site-footer a {
    display: block;
    margin: 8px 0;
    color: rgba(255,255,255,.72);
}
.site-footer a:hover { color: #fff; }
.site-footer p { color: rgba(255,255,255,.66); }
.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 28px;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,.12);
    font-size: .88rem;
    color: rgba(255,255,255,.56);
}

@media (min-width: 640px) {
    .container { width: min(100% - 48px, 1160px); }
    .feature-grid,
    .card-grid,
    .article-grid,
    .steps-grid,
    .scenario-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .hero,
    .page-hero { padding-top: 72px; }
    .download-panel { grid-template-columns: 1fr auto; align-items: center; }
}

@media (min-width: 920px) {
    .nav-toggle-label { display: none; }
    .site-nav {
        position: static;
        display: flex;
        align-items: center;
        justify-content: flex-end;
        gap: 4px;
        padding: 0;
        background: transparent;
        border: 0;
        border-radius: 0;
        box-shadow: none;
    }
    .site-nav a { padding: 9px 12px; }
    .hero-grid { grid-template-columns: minmax(0, 1.05fr) minmax(340px, .95fr); gap: 54px; }
    .split { grid-template-columns: minmax(0, 1fr) 360px; gap: 28px; }
    .feature-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .card-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .scenario-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .footer-grid { grid-template-columns: 1.5fr repeat(3, 1fr); }
    .footer-bottom { flex-direction: row; justify-content: space-between; }
}

@media (min-width: 1180px) {
    .hero { padding: 92px 0 54px; }
    .section { padding: 54px 0; }
    .card,
    .guide-card,
    .step-card { padding: 26px; }
}