* {
    box-sizing: border-box;
}

:root {
    --primary: rgb(70,139,223);
    --primary-dark: rgb(42,92,160);
    --primary-soft: rgba(70,139,223,.12);
    --text: #132238;
    --muted: #64748b;
    --line: #dbe7f7;
    --card: rgba(255,255,255,.86);
    --bg: #f7fbff;
    --blue-50: #edf6ff;
    --blue-100: #dceeff;
    --shadow: 0 20px 60px rgba(49, 98, 160, .12);
    --radius: 22px;
}

html {
    width: 100%;
    overflow-x: hidden;
    scroll-behavior: smooth;
}

body {
    width: 100%;
    min-width: 0;
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 10% 0%, rgba(70,139,223,.14), transparent 30%),
        linear-gradient(180deg, #f7fbff 0%, #ffffff 42%, #f5f9ff 100%);
    line-height: 1.75;
    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,.78);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(219,231,247,.78);
}

.nav-shell {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.brand,
.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: .02em;
    color: #10243f;
}

.brand-logo {
    width: 36px;
    height: 36px;
    border-radius: 12px;
}

.nav-toggle {
    width: 42px;
    height: 42px;
    border: 1px solid var(--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: 18px;
    height: 2px;
    background: #1d3557;
    border-radius: 99px;
}

.site-nav {
    position: absolute;
    top: 72px;
    right: 16px;
    left: 16px;
    display: none;
    flex-direction: column;
    padding: 14px;
    background: rgba(255,255,255,.96);
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: var(--shadow);
}

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

.site-nav a {
    padding: 12px 14px;
    color: #334155;
    border-radius: 14px;
    font-size: 15px;
}

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

main {
    min-height: 60vh;
}

.container,
.section {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}

.section {
    padding: 52px 0;
}

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

.section-kicker,
.badge,
.category-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    width: fit-content;
    padding: 6px 12px;
    border-radius: 999px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-size: 13px;
    font-weight: 700;
}

.section h2,
.content-section h2 {
    margin: 12px 0 10px;
    font-size: clamp(26px, 4vw, 42px);
    line-height: 1.18;
    letter-spacing: -0.04em;
}

.section p,
.content-section p {
    color: var(--muted);
}

.centered-hero {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
    padding: 78px 0 32px;
    text-align: center;
}

.centered-hero h1 {
    max-width: 940px;
    margin: 18px auto 18px;
    font-size: clamp(36px, 7vw, 76px);
    line-height: 1.05;
    letter-spacing: -0.06em;
}

.centered-hero .lead {
    max-width: 780px;
    margin: 0 auto 28px;
    font-size: clamp(16px, 2.2vw, 20px);
    color: #4c5f77;
}

.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;
    letter-spacing: .02em;
    border: 1px solid rgba(70,139,223,.18);
    box-shadow: 0 14px 32px rgba(70,139,223,.24);
    transition: transform .2s ease, box-shadow .2s ease;
}

.download-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 18px 38px rgba(70,139,223,.28);
}

.security-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin: 20px auto 0;
}

.security-tags span {
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,.86);
    border: 1px solid var(--line);
    color: #33506f;
    font-size: 13px;
}

.product-bento {
    width: min(1120px, calc(100% - 32px));
    margin: 28px auto 36px;
    display: grid;
    gap: 16px;
}

.product-main-card,
.card,
.bento-card,
.doc-card,
.faq-item,
.scenario-card,
.category-card,
.security-principles,
.download-panel {
    background: var(--card);
    border: 1px solid rgba(219,231,247,.86);
    border-radius: var(--radius);
    box-shadow: 0 14px 50px rgba(36,80,132,.08);
}

.product-main-card {
    min-height: 440px;
    position: relative;
    overflow: hidden;
    padding: 24px;
    display: grid;
    place-items: center;
    background:
        radial-gradient(circle at 50% 18%, rgba(70,139,223,.20), transparent 36%),
        linear-gradient(145deg, #ffffff, #eef7ff);
}

.product-main-card::before {
    content: "";
    position: absolute;
    inset: 22px;
    border: 1px solid rgba(70,139,223,.18);
    border-radius: 28px;
    pointer-events: none;
}

.product-phone {
    width: min(250px, 72%);
    margin: 0 auto;
    filter: drop-shadow(0 24px 42px rgba(25,75,130,.18));
}

.status-grid {
    display: grid;
    gap: 16px;
}

.status-card {
    padding: 18px;
    border-radius: 20px;
    background: rgba(255,255,255,.9);
    border: 1px solid var(--line);
}

.status-card strong {
    display: block;
    margin-bottom: 6px;
    color: #152d4e;
}

.status-card p {
    margin: 0;
    color: var(--muted);
    font-size: 14px;
}

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

.card,
.category-card,
.scenario-card,
.doc-card {
    padding: 22px;
}

.card h3,
.category-card h3,
.scenario-card h3,
.doc-card h3,
.bento-card h3 {
    margin: 0 0 8px;
    font-size: 20px;
    line-height: 1.35;
}

.card p,
.category-card p,
.scenario-card p,
.doc-card p,
.bento-card p {
    margin: 0;
    color: var(--muted);
}

.card-link {
    display: inline-flex;
    margin-top: 14px;
    color: var(--primary-dark);
    font-weight: 800;
}

.roadmap {
    position: relative;
    display: grid;
    gap: 14px;
    counter-reset: step;
}

.roadmap-step {
    position: relative;
    padding: 20px 20px 20px 68px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
}

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

.roadmap-step h3 {
    margin: 0 0 4px;
    font-size: 18px;
}

.roadmap-step p {
    margin: 0;
}

.bento-grid {
    display: grid;
    gap: 16px;
}

.bento-card {
    min-height: 168px;
    padding: 24px;
    background:
        linear-gradient(160deg, rgba(255,255,255,.95), rgba(239,247,255,.72));
}

.bento-card.large {
    min-height: 230px;
}

.bento-card.small {
    min-height: 140px;
}

.security-layout {
    display: grid;
    gap: 18px;
    align-items: start;
}

.security-principles {
    padding: 24px;
    background:
        linear-gradient(160deg, rgba(255,255,255,.94), rgba(235,246,255,.9));
}

.security-principles ul,
.clean-list,
.check-list {
    margin: 0;
    padding: 0;
    list-style: none;
}

.security-principles li,
.clean-list li,
.check-list li {
    padding: 12px 0 12px 30px;
    border-bottom: 1px solid rgba(219,231,247,.9);
    position: relative;
    color: #415873;
}

.security-principles li:last-child,
.clean-list li:last-child,
.check-list li:last-child {
    border-bottom: 0;
}

.security-principles li::before,
.clean-list li::before,
.check-list li::before {
    content: "";
    position: absolute;
    left: 2px;
    top: 19px;
    width: 10px;
    height: 10px;
    border-radius: 99px;
    background: var(--primary);
    box-shadow: 0 0 0 5px rgba(70,139,223,.12);
}

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

.faq-item {
    padding: 20px;
}

.faq-item h3 {
    margin: 0 0 8px;
    font-size: 18px;
}

.faq-item p {
    margin: 0;
    color: var(--muted);
}

.cta-section {
    width: min(1120px, calc(100% - 32px));
    margin: 42px auto 72px;
    padding: 44px 22px;
    text-align: center;
    border-radius: 30px;
    background:
        radial-gradient(circle at 20% 15%, rgba(70,139,223,.20), transparent 30%),
        linear-gradient(135deg, #ffffff, #eaf5ff);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.cta-section h2 {
    margin: 0 0 12px;
    font-size: clamp(28px, 4vw, 46px);
    line-height: 1.15;
    letter-spacing: -0.04em;
}

.cta-section p {
    max-width: 700px;
    margin: 0 auto 22px;
    color: var(--muted);
}

.page-hero {
    width: min(960px, calc(100% - 32px));
    margin: 0 auto;
    padding: 70px 0 30px;
}

.page-hero h1 {
    margin: 14px 0 14px;
    font-size: clamp(34px, 6vw, 58px);
    line-height: 1.12;
    letter-spacing: -0.05em;
}

.page-hero p {
    color: var(--muted);
    font-size: 18px;
    margin: 0;
}

.content-wrap {
    width: min(1050px, calc(100% - 32px));
    margin: 0 auto 72px;
    display: grid;
    gap: 22px;
}

.content-section {
    padding: 28px;
    border-radius: 26px;
    background: rgba(255,255,255,.84);
    border: 1px solid var(--line);
    box-shadow: 0 16px 42px rgba(36,80,132,.07);
}

.content-section h2 {
    font-size: clamp(24px, 3vw, 34px);
}

.doc-layout {
    display: grid;
    gap: 18px;
}

.doc-main {
    display: grid;
    gap: 18px;
}

.side-panel {
    display: grid;
    gap: 16px;
}

.notice {
    padding: 18px;
    border-radius: 20px;
    background: #f2f8ff;
    border: 1px solid var(--line);
    color: #38536f;
}

.notice strong {
    color: #162d4d;
}

.process-steps {
    display: grid;
    gap: 12px;
    margin-top: 16px;
}

.process-step {
    padding: 18px;
    border-radius: 18px;
    background: #ffffff;
    border: 1px solid var(--line);
}

.process-step span {
    display: inline-flex;
    width: 28px;
    height: 28px;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
    margin-bottom: 10px;
}

.download-panel {
    padding: 26px;
    text-align: center;
    background:
        linear-gradient(145deg, #ffffff, #eef7ff);
}

.download-panel p {
    margin: 0 0 18px;
}

.category-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}

.category-nav a {
    padding: 9px 12px;
    border-radius: 999px;
    background: #fff;
    border: 1px solid var(--line);
    color: #34516e;
    font-size: 14px;
}

.site-footer {
    background: #f1f7ff;
    border-top: 1px solid var(--line);
    padding: 42px 0 24px;
}

.footer-grid {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
    display: grid;
    gap: 26px;
}

.footer-grid p {
    color: var(--muted);
    margin-bottom: 0;
}

.footer-grid h3 {
    margin: 0 0 10px;
    font-size: 16px;
}

.footer-grid a {
    display: block;
    color: #52687f;
    margin: 7px 0;
    font-size: 14px;
}

.footer-brand img {
    width: 34px;
    height: 34px;
    border-radius: 12px;
}

.footer-bottom {
    width: min(1120px, calc(100% - 32px));
    margin: 28px auto 0;
    padding-top: 18px;
    border-top: 1px solid var(--line);
    color: #71839a;
    font-size: 13px;
}

@media (min-width: 680px) {
    .capability-grid,
    .scenario-grid,
    .feature-grid,
    .article-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .category-bento {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .footer-grid {
        grid-template-columns: 1.6fr 1fr 1fr 1fr;
    }
}

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

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

    .site-nav a {
        padding: 8px 12px;
    }

    .product-bento {
        grid-template-columns: 1.25fr .75fr;
        align-items: stretch;
    }

    .status-grid {
        grid-template-rows: repeat(4, 1fr);
    }

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

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

    .roadmap-step:nth-child(even) {
        transform: translateY(18px);
    }

    .category-bento {
        grid-template-columns: repeat(4, minmax(0, 1fr));
        grid-auto-flow: dense;
    }

    .category-card.featured {
        grid-column: span 2;
        min-height: 210px;
    }

    .bento-grid {
        grid-template-columns: repeat(6, minmax(0, 1fr));
    }

    .bento-card.large {
        grid-column: span 3;
    }

    .bento-card.medium {
        grid-column: span 2;
    }

    .bento-card.small {
        grid-column: span 1;
    }

    .security-layout {
        grid-template-columns: minmax(0, 1fr) 380px;
    }

    .scenario-grid {
        grid-template-columns: repeat(5, minmax(0, 1fr));
    }

    .doc-layout {
        grid-template-columns: minmax(0, 1fr) 320px;
        align-items: start;
    }

    .side-panel {
        position: sticky;
        top: 96px;
    }
}

@media (max-width: 480px) {
    .nav-shell,
    .container,
    .section,
    .product-bento,
    .centered-hero,
    .page-hero,
    .content-wrap,
    .cta-section,
    .footer-grid,
    .footer-bottom {
        width: min(100% - 24px, 1120px);
    }

    .centered-hero {
        padding-top: 54px;
    }

    .product-main-card {
        min-height: 340px;
        padding: 18px;
    }

    .content-section {
        padding: 22px;
    }

    .download-btn {
        width: 100%;
    }

    .cta-section .download-btn,
    .centered-hero .download-btn,
    .download-panel .download-btn {
        width: auto;
        min-width: 180px;
    }
}