:root {
    --primary: rgb(70,139,223);
    --primary-dark: #245fa8;
    --primary-soft: #eef6ff;
    --ink: #102033;
    --muted: #607089;
    --line: #dbe7f5;
    --bg: #f7fbff;
    --card: #ffffff;
    --radius: 20px;
    --shadow: 0 18px 45px rgba(31, 87, 150, 0.11);
}

* {
    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(--ink);
    background: linear-gradient(180deg, #f5faff 0%, #ffffff 38%, #f7fbff 100%);
    line-height: 1.75;
    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: 30;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(219, 231, 245, 0.85);
}

.header-inner {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: #15365d;
    letter-spacing: -0.02em;
}

.brand-logo {
    width: 38px;
    height: 38px;
    object-fit: contain;
}

.brand-text {
    font-size: 18px;
}

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

.nav-toggle span {
    width: 18px;
    height: 2px;
    border-radius: 999px;
    background: var(--ink);
}

.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    display: none;
    flex-direction: column;
    padding: 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}

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

.site-nav a {
    padding: 12px 14px;
    border-radius: 12px;
    color: #42546e;
    font-size: 15px;
    font-weight: 600;
}

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

.hero {
    padding: 44px 0 30px;
    position: relative;
}

.hero::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 72%;
    background: radial-gradient(circle at 15% 10%, rgba(70,139,223,0.18), transparent 32%), radial-gradient(circle at 90% 22%, rgba(70,139,223,0.13), transparent 34%);
    pointer-events: none;
}

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

.eyebrow,
.category-badge {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    gap: 8px;
    border: 1px solid rgba(70,139,223,0.28);
    background: rgba(238, 246, 255, 0.9);
    color: var(--primary-dark);
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 700;
}

h1,
h2,
h3 {
    line-height: 1.25;
    margin: 0 0 14px;
    color: #12213a;
}

h1 {
    font-size: clamp(30px, 8vw, 58px);
    letter-spacing: -0.055em;
    margin-top: 18px;
}

h2 {
    font-size: clamp(24px, 5vw, 38px);
    letter-spacing: -0.035em;
}

h3 {
    font-size: 19px;
}

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

.hero-lead {
    font-size: 17px;
    max-width: 620px;
    color: #43546a;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
    margin-top: 22px;
}

.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: 0.02em;
    box-shadow: 0 14px 28px rgba(70,139,223,0.28);
    transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    background: var(--primary-dark);
    box-shadow: 0 18px 34px rgba(70,139,223,0.32);
}

.text-link {
    color: var(--primary-dark);
    font-weight: 800;
}

.tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}

.tag {
    padding: 8px 12px;
    border-radius: 999px;
    background: #fff;
    border: 1px solid var(--line);
    color: #405269;
    font-size: 13px;
    font-weight: 700;
}

.hero-visual {
    position: relative;
    padding: 16px;
    border-radius: 30px;
    background: linear-gradient(145deg, rgba(255,255,255,0.78), rgba(238,246,255,0.96));
    border: 1px solid rgba(219,231,245,0.9);
    box-shadow: var(--shadow);
    min-height: 430px;
    overflow: hidden;
}

.hero-visual::after {
    content: "";
    position: absolute;
    right: -60px;
    bottom: -80px;
    width: 220px;
    height: 220px;
    border-radius: 50%;
    background: rgba(70,139,223,0.13);
}

.app-shot {
    width: min(78%, 310px);
    margin: 18px auto 0;
    filter: drop-shadow(0 24px 30px rgba(31,87,150,0.16));
    position: relative;
    z-index: 2;
}

.float-card,
.status-card {
    position: relative;
    z-index: 3;
    background: rgba(255,255,255,0.94);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: 0 12px 28px rgba(31,87,150,0.1);
    padding: 14px;
}

.status-card {
    display: grid;
    gap: 7px;
    margin-bottom: 14px;
}

.status-line {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    font-size: 13px;
    color: var(--muted);
}

.status-line strong {
    color: #1d3a61;
}

.float-card {
    position: absolute;
    max-width: 190px;
    font-size: 13px;
    color: #51637b;
}

.float-card strong {
    display: block;
    color: #15365d;
    margin-bottom: 4px;
}

.float-one { left: 8px; bottom: 82px; }
.float-two { right: 8px; top: 128px; }
.float-three { right: 18px; bottom: 24px; }

.section {
    padding: 52px 0;
}

.section-head {
    max-width: 760px;
    margin-bottom: 26px;
}

.center-head {
    text-align: center;
    margin: 0 auto 30px;
}

.metric-strip {
    display: grid;
    gap: 14px;
    background: rgba(255,255,255,0.84);
    border: 1px solid var(--line);
    border-radius: 24px;
    box-shadow: var(--shadow);
    padding: 16px;
}

.metric-item {
    padding: 16px;
    border-radius: 18px;
    background: linear-gradient(180deg, #ffffff, #f0f7ff);
    border: 1px solid rgba(219,231,245,0.88);
}

.metric-item b {
    display: block;
    color: #12213a;
    font-size: 18px;
    margin-bottom: 5px;
}

.metric-item span {
    color: var(--muted);
    font-size: 14px;
}

.grid,
.category-grid,
.feature-grid,
.scenario-grid,
.article-grid,
.faq-grid {
    display: grid;
    gap: 16px;
}

.card,
.category-card,
.feature-card,
.scenario-card,
.faq-item,
.guide-card,
.info-panel {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: 0 12px 28px rgba(31,87,150,0.07);
}

.category-card,
.guide-card {
    transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}

.category-card:hover,
.guide-card:hover {
    transform: translateY(-4px);
    border-color: rgba(70,139,223,0.42);
    box-shadow: var(--shadow);
}

.card-kicker {
    display: inline-flex;
    color: var(--primary-dark);
    font-size: 12px;
    font-weight: 800;
    background: var(--primary-soft);
    border-radius: 999px;
    padding: 4px 9px;
    margin-bottom: 12px;
}

.step-grid {
    counter-reset: step;
    display: grid;
    gap: 16px;
}

.step-card {
    position: relative;
    padding: 20px 20px 20px 68px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: 0 12px 26px rgba(31,87,150,0.06);
}

.step-card::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 20px;
    top: 22px;
    width: 34px;
    height: 34px;
    border-radius: 12px;
    display: grid;
    place-items: center;
    color: #fff;
    background: var(--primary);
    font-weight: 900;
}

.security-layout,
.split-layout {
    display: grid;
    gap: 22px;
    align-items: center;
}

.security-panel {
    background: linear-gradient(160deg, #ffffff 0%, #edf6ff 100%);
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 22px;
    box-shadow: var(--shadow);
}

.security-row {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 0;
    border-bottom: 1px solid var(--line);
}

.security-row:last-child {
    border-bottom: none;
}

.security-row span {
    color: var(--muted);
}

.security-row strong {
    color: #17375e;
}

.process-steps {
    display: grid;
    gap: 16px;
}

.process-step {
    padding: 18px;
    border-radius: 20px;
    background: linear-gradient(180deg, #fff, #f4f9ff);
    border: 1px solid var(--line);
}

.process-step b {
    display: block;
    color: var(--primary-dark);
    margin-bottom: 6px;
}

.cta-section {
    text-align: center;
    padding: 38px 20px;
    border-radius: 30px;
    background: linear-gradient(135deg, rgba(70,139,223,0.12), rgba(255,255,255,0.92));
    border: 1px solid rgba(70,139,223,0.18);
    box-shadow: var(--shadow);
}

.page-hero {
    padding: 46px 0 24px;
}

.page-hero .container {
    display: grid;
    gap: 16px;
}

.page-hero h1 {
    max-width: 820px;
}

.page-hero p {
    max-width: 760px;
    font-size: 17px;
}

.content-page {
    padding: 20px 0 60px;
}

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

.notice {
    border-left: 4px solid var(--primary);
    background: var(--primary-soft);
    padding: 16px;
    border-radius: 16px;
    color: #37506d;
}

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

.check-list li,
.clean-list li {
    padding: 12px 14px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fff;
    color: #4e6077;
}

.check-list li::before {
    content: "✓";
    color: var(--primary-dark);
    font-weight: 900;
    margin-right: 8px;
}

.faq-item h3 {
    cursor: default;
}

.download-panel {
    display: grid;
    gap: 18px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 24px;
    box-shadow: var(--shadow);
}

.download-panel .download-btn {
    width: fit-content;
}

.footer-grid {
    display: grid;
    gap: 24px;
    padding: 42px 0 24px;
}

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

.footer-brand {
    font-size: 20px;
    font-weight: 900;
    color: #14375f;
    margin-bottom: 8px;
}

.site-footer h3 {
    font-size: 16px;
    margin-bottom: 10px;
}

.site-footer a {
    display: block;
    color: #51637b;
    padding: 4px 0;
}

.footer-bottom {
    border-top: 1px solid var(--line);
    padding: 16px 0 24px;
    color: var(--muted);
    font-size: 13px;
}

@media (min-width: 680px) {
    .category-grid,
    .feature-grid,
    .scenario-grid,
    .article-grid,
    .faq-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .metric-strip,
    .process-steps {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (min-width: 920px) {
    .nav-toggle {
        display: none;
    }
    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
        gap: 2px;
        align-items: center;
    }
    .site-nav a {
        padding: 9px 12px;
    }
    .hero {
        padding: 74px 0 46px;
    }
    .hero-layout,
    .security-layout,
    .split-layout {
        grid-template-columns: 1.05fr .95fr;
    }
    .metric-strip {
        grid-template-columns: repeat(4, minmax(0, 1fr));
        padding: 18px;
    }
    .category-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
    .feature-grid,
    .scenario-grid,
    .article-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .step-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .footer-grid {
        grid-template-columns: 1.6fr .7fr .7fr;
    }
    .section {
        padding: 70px 0;
    }
    .download-panel {
        grid-template-columns: 1fr auto;
        align-items: center;
    }
}

@media (max-width: 420px) {
    .container {
        width: min(100% - 24px, 1160px);
    }
    .download-btn {
        width: 100%;
    }
    .hero-actions .text-link {
        width: 100%;
        text-align: center;
    }
    .float-card {
        position: relative;
        left: auto;
        right: auto;
        top: auto;
        bottom: auto;
        max-width: none;
        margin-top: 10px;
    }
    .hero-visual {
        min-height: auto;
    }
}