* {
    box-sizing: border-box;
}
:root {
    --primary: rgb(70,139,223);
    --primary-deep: #1f5faa;
    --primary-soft: #eaf4ff;
    --text: #17233c;
    --muted: #617089;
    --line: #dce8f7;
    --card: rgba(255,255,255,.86);
    --bg: #f7fbff;
    --shadow: 0 16px 42px rgba(31,95,170,.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: linear-gradient(180deg, #f4f9ff 0%, #ffffff 42%, #f7fbff 100%);
    line-height: 1.7;
    overflow-x: hidden;
}
a {
    color: inherit;
    text-decoration: none;
}
img {
    max-width: 100%;
    display: block;
}
.container {
    width: min(100% - 32px, 1160px);
    margin: 0 auto;
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(220,232,247,.9);
}
.header-inner {
    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: #13345f;
    white-space: nowrap;
}
.logo {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    box-shadow: 0 8px 22px rgba(70,139,223,.18);
}
.nav-toggle {
    display: none;
}
.nav-toggle-label {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 8px 14px;
    border-radius: 999px;
    color: var(--primary-deep);
    background: var(--primary-soft);
    font-weight: 700;
    cursor: pointer;
}
.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    display: none;
    grid-template-columns: 1fr;
    gap: 6px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
    box-shadow: var(--shadow);
}
.nav-toggle:checked ~ .site-nav {
    display: grid;
}
.site-nav a {
    padding: 11px 12px;
    border-radius: 12px;
    color: #284160;
    font-weight: 650;
}
.site-nav a:hover {
    background: var(--primary-soft);
    color: var(--primary-deep);
}
.section {
    padding: 52px 0;
}
.hero-section {
    padding: 54px 0 42px;
    background:
        radial-gradient(circle at 10% 20%, rgba(70,139,223,.18), transparent 30%),
        radial-gradient(circle at 90% 10%, rgba(70,139,223,.12), transparent 28%);
}
.hero-layout {
    display: grid;
    gap: 28px;
    align-items: center;
}
.eyebrow, .badge {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(70,139,223,.11);
    color: var(--primary-deep);
    font-size: 13px;
    font-weight: 800;
}
h1, h2, h3 {
    line-height: 1.22;
    margin: 0 0 16px;
    color: #132846;
}
h1 {
    font-size: clamp(34px, 8vw, 62px);
    letter-spacing: -1.6px;
}
h2 {
    font-size: clamp(26px, 5vw, 40px);
    letter-spacing: -1px;
}
h3 {
    font-size: 20px;
}
p {
    margin: 0 0 16px;
    color: var(--muted);
}
.hero-copy p {
    font-size: 17px;
}
.hero-tags, .tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 20px 0 26px;
}
.hero-tags span, .tag-row span {
    padding: 8px 12px;
    border: 1px solid rgba(70,139,223,.18);
    border-radius: 999px;
    background: rgba(255,255,255,.82);
    color: #31506f;
    font-size: 13px;
    font-weight: 700;
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    color: #fff;
    background: linear-gradient(135deg, var(--primary), #2b72c8);
    font-weight: 800;
    letter-spacing: .3px;
    box-shadow: 0 14px 28px rgba(70,139,223,.25);
    transition: transform .2s ease, box-shadow .2s ease;
}
.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 18px 34px rgba(70,139,223,.32);
}
.hero-visual {
    position: relative;
    min-height: 440px;
    border-radius: 32px;
    padding: 24px;
    background: linear-gradient(145deg, rgba(255,255,255,.92), rgba(234,244,255,.88));
    border: 1px solid rgba(220,232,247,.88);
    box-shadow: var(--shadow);
    overflow: hidden;
}
.hero-visual::before {
    content: "";
    position: absolute;
    width: 260px;
    height: 260px;
    right: -80px;
    top: -70px;
    border-radius: 50%;
    background: rgba(70,139,223,.16);
}
.app-frame {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
}
.app-frame img {
    max-height: 390px;
    border-radius: 28px;
    filter: drop-shadow(0 26px 38px rgba(32,70,118,.18));
}
.float-card {
    position: absolute;
    left: 18px;
    bottom: 24px;
    max-width: 210px;
    padding: 14px;
    border-radius: 18px;
    background: rgba(255,255,255,.88);
    border: 1px solid rgba(220,232,247,.92);
    box-shadow: 0 12px 26px rgba(26,69,118,.10);
}
.float-card strong {
    display: block;
    color: #14365f;
}
.status-list {
    position: absolute;
    right: 18px;
    top: 24px;
    display: grid;
    gap: 10px;
}
.status-list span {
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,.92);
    border: 1px solid var(--line);
    color: #24466d;
    font-weight: 800;
    font-size: 12px;
}
.stats-grid, .category-grid, .feature-grid, .scenario-grid, .guide-grid, .faq-grid {
    display: grid;
    gap: 16px;
}
.stats-grid {
    grid-template-columns: 1fr;
}
.stat-card, .category-card, .feature-card, .scenario-card, .faq-item, .info-card, .tip-card, .step-card, .panel-card {
    border-radius: var(--radius);
    background: var(--card);
    border: 1px solid rgba(220,232,247,.88);
    box-shadow: 0 10px 28px rgba(31,95,170,.07);
}
.stat-card {
    padding: 20px;
}
.stat-card strong {
    display: block;
    color: var(--primary-deep);
    font-size: 18px;
    margin-bottom: 4px;
}
.section-head {
    max-width: 760px;
    margin-bottom: 24px;
}
.category-grid {
    grid-template-columns: 1fr;
}
.category-card {
    padding: 22px;
    transition: transform .2s ease, border-color .2s ease;
}
.category-card:hover {
    transform: translateY(-3px);
    border-color: rgba(70,139,223,.45);
}
.category-card .arrow {
    color: var(--primary-deep);
    font-weight: 900;
}
.split-layout, .security-layout, .page-layout {
    display: grid;
    gap: 24px;
    align-items: start;
}
.feature-grid {
    grid-template-columns: 1fr;
}
.feature-card, .scenario-card, .info-card, .panel-card, .tip-card {
    padding: 24px;
}
.feature-icon {
    width: 44px;
    height: 44px;
    display: inline-grid;
    place-items: center;
    border-radius: 15px;
    background: var(--primary-soft);
    color: var(--primary-deep);
    font-weight: 900;
    margin-bottom: 14px;
}
.security-panel {
    padding: 26px;
    border-radius: 30px;
    background: linear-gradient(135deg, #ffffff, #eef7ff);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.security-list, .check-list, .plain-list {
    display: grid;
    gap: 12px;
    padding: 0;
    margin: 16px 0 0;
    list-style: none;
}
.security-list li, .check-list li, .plain-list li {
    padding: 12px 14px;
    border-radius: 14px;
    background: rgba(255,255,255,.78);
    border: 1px solid rgba(220,232,247,.88);
    color: #3f5875;
}
.steps {
    display: grid;
    gap: 16px;
    counter-reset: step;
}
.step-card {
    position: relative;
    padding: 22px;
}
.step-card::before {
    counter-increment: step;
    content: counter(step);
    display: inline-grid;
    place-items: center;
    width: 34px;
    height: 34px;
    margin-bottom: 12px;
    border-radius: 50%;
    color: #fff;
    background: var(--primary);
    font-weight: 900;
}
.scenario-grid {
    grid-template-columns: 1fr;
}
.faq-grid {
    grid-template-columns: 1fr;
}
.faq-item {
    padding: 20px;
}
.faq-item h3 {
    font-size: 18px;
}
.cta-section {
    padding: 64px 0;
}
.cta-box {
    text-align: center;
    padding: 36px 22px;
    border-radius: 30px;
    background: linear-gradient(135deg, rgba(70,139,223,.12), rgba(255,255,255,.96));
    border: 1px solid rgba(70,139,223,.18);
    box-shadow: var(--shadow);
}
.page-hero {
    padding: 54px 0 30px;
    background: radial-gradient(circle at 18% 10%, rgba(70,139,223,.16), transparent 30%);
}
.page-hero .container {
    max-width: 930px;
}
.content-card {
    padding: 26px;
    border-radius: 28px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.notice {
    padding: 18px;
    border-left: 4px solid var(--primary);
    border-radius: 18px;
    background: #f0f7ff;
    color: #35506f;
}
.download-panel {
    max-width: 780px;
    margin: 0 auto;
    text-align: center;
    padding: 32px 22px;
    border-radius: 30px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.site-footer {
    margin-top: 40px;
    padding: 42px 0 24px;
    background: #10233d;
    color: #dce8f7;
}
.site-footer p, .site-footer a, .footer-bottom {
    color: #b9c8dc;
}
.footer-grid {
    display: grid;
    gap: 24px;
}
.footer-brand {
    font-size: 22px;
    font-weight: 900;
    margin-bottom: 8px;
    color: #fff;
}
.site-footer h3 {
    color: #fff;
    font-size: 16px;
}
.site-footer a {
    display: block;
    margin: 8px 0;
}
.footer-bottom {
    padding-top: 22px;
    margin-top: 24px;
    border-top: 1px solid rgba(255,255,255,.12);
    font-size: 14px;
}
@media (min-width: 640px) {
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .category-grid { grid-template-columns: repeat(2, 1fr); }
    .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .scenario-grid { grid-template-columns: repeat(2, 1fr); }
    .steps { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 900px) {
    .nav-toggle-label { display: none; }
    .site-nav {
        position: static;
        display: flex;
        align-items: center;
        gap: 4px;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
    }
    .site-nav a { font-size: 14px; }
    .hero-layout { grid-template-columns: minmax(0, 1.05fr) minmax(360px, .95fr); }
    .split-layout, .security-layout, .page-layout { grid-template-columns: 1fr 1fr; }
    .feature-grid, .category-grid { grid-template-columns: repeat(3, 1fr); }
    .stats-grid { grid-template-columns: repeat(4, 1fr); }
    .steps { grid-template-columns: repeat(4, 1fr); }
    .scenario-grid { grid-template-columns: repeat(3, 1fr); }
    .faq-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
    .section { padding: 70px 0; }
}
@media (min-width: 1100px) {
    .hero-section { padding: 76px 0 58px; }
    .hero-visual { min-height: 510px; }
    .app-frame img { max-height: 450px; }
}