:root {
    --primary: rgb(70,139,223);
    --primary-soft: rgba(70,139,223,0.12);
    --primary-lighter: rgba(70,139,223,0.07);
    --ink: #17233a;
    --muted: #66748a;
    --line: #dbe6f5;
    --panel: rgba(255,255,255,0.86);
    --panel-solid: #ffffff;
    --bg: #f5f9ff;
    --radius-lg: 28px;
    --radius-md: 22px;
    --radius-sm: 16px;
    --shadow-soft: 0 18px 50px rgba(37, 73, 118, 0.10);
    --shadow-card: 0 12px 34px rgba(44, 88, 139, 0.08);
}

* {
    box-sizing: border-box;
}

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

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    color: var(--ink);
    background:
        radial-gradient(circle at 15% 0%, rgba(70,139,223,0.13), transparent 30%),
        linear-gradient(180deg, #f8fbff 0%, #ffffff 36%, #f3f8ff 100%);
    line-height: 1.72;
    overflow-x: hidden;
    min-width: 320px;
}

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

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    background: rgba(255,255,255,0.82);
    border-bottom: 1px solid rgba(216,227,241,0.74);
}

.nav-shell {
    max-width: 1180px;
    margin: 0 auto;
    min-height: 72px;
    padding: 0 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 760;
    letter-spacing: -0.02em;
}

.brand-logo {
    width: 38px;
    height: 38px;
    border-radius: 12px;
}

.brand-text {
    white-space: nowrap;
}

.site-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 14px;
    right: 14px;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: rgba(255,255,255,0.96);
    box-shadow: var(--shadow-soft);
}

.site-nav.open {
    display: grid;
    gap: 4px;
}

.site-nav a {
    padding: 12px 14px;
    border-radius: 14px;
    color: var(--muted);
    font-size: 15px;
}

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

.nav-toggle {
    width: 44px;
    height: 44px;
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 14px;
    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: 99px;
    background: var(--ink);
}

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

.centered-hero {
    padding: 74px 0 32px;
    text-align: center;
}

.eyebrow,
.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border: 1px solid rgba(70,139,223,0.18);
    background: var(--primary-soft);
    color: var(--primary);
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
}

.centered-hero h1,
.article-hero h1,
.page-title h1 {
    margin: 20px auto 16px;
    font-size: clamp(34px, 8vw, 76px);
    line-height: 1.04;
    letter-spacing: -0.065em;
    max-width: 960px;
}

.centered-hero .hero-lead {
    max-width: 760px;
    margin: 0 auto 26px;
    color: #536176;
    font-size: clamp(16px, 2.4vw, 20px);
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: rgb(70,139,223);
    color: #fff;
    font-weight: 760;
    letter-spacing: 0.01em;
    box-shadow: 0 12px 28px rgba(70,139,223,0.25);
    transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 18px 36px rgba(70,139,223,0.32);
}

.security-tags {
    margin-top: 18px;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
}

.security-tags span,
.soft-tag {
    display: inline-flex;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,0.78);
    border: 1px solid var(--line);
    color: #4c5d75;
    font-size: 13px;
}

.section {
    padding: 52px 0;
}

.section-title {
    max-width: 730px;
    margin-bottom: 24px;
}

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

.section-title h2 {
    margin: 0 0 10px;
    font-size: clamp(26px, 4.8vw, 44px);
    line-height: 1.12;
    letter-spacing: -0.04em;
}

.section-title p {
    margin: 0;
    color: var(--muted);
}

.product-bento {
    display: grid;
    gap: 16px;
    grid-template-columns: 1fr;
    align-items: stretch;
}

.product-card {
    min-height: 420px;
    overflow: hidden;
    position: relative;
    padding: 26px;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background:
        linear-gradient(135deg, rgba(70,139,223,0.12), rgba(255,255,255,0.84)),
        #ffffff;
    box-shadow: var(--shadow-soft);
    display: grid;
    align-items: center;
    justify-items: center;
}

.product-card::before {
    content: "";
    position: absolute;
    inset: 18px;
    border-radius: 24px;
    border: 1px dashed rgba(70,139,223,0.18);
    pointer-events: none;
}

.product-card img {
    max-height: 420px;
    object-fit: contain;
    filter: drop-shadow(0 22px 34px rgba(35, 77, 128, 0.18));
    z-index: 1;
}

.status-stack {
    display: grid;
    gap: 14px;
}

.status-card,
.feature-card,
.category-card,
.scenario-card,
.faq-item,
.principle-card,
.article-card,
.side-card,
.step-card,
.download-panel,
.about-card {
    border: 1px solid var(--line);
    background: var(--panel);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
}

.status-card {
    padding: 18px;
}

.status-card small,
.feature-card small {
    color: var(--primary);
    font-weight: 760;
    display: block;
    margin-bottom: 7px;
}

.status-card strong {
    display: block;
    font-size: 18px;
    margin-bottom: 4px;
}

.status-card p,
.feature-card p,
.category-card p,
.scenario-card p,
.principle-card p,
.article-card p,
.side-card p,
.step-card p,
.about-card p {
    color: var(--muted);
    margin: 0;
}

.capability-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
}

.feature-card {
    padding: 22px;
}

.feature-card h3,
.category-card h3,
.scenario-card h3,
.step-card h3,
.side-card h3,
.article-card h2,
.about-card h2 {
    margin: 0 0 9px;
    line-height: 1.25;
    letter-spacing: -0.02em;
}

.roadmap {
    position: relative;
    display: grid;
    gap: 14px;
}

.step-card {
    position: relative;
    padding: 20px;
}

.step-index {
    width: 36px;
    height: 36px;
    display: inline-grid;
    place-items: center;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    margin-bottom: 12px;
}

.step-card a,
.category-card a,
.scenario-card a,
.inline-link {
    display: inline-flex;
    margin-top: 12px;
    color: var(--primary);
    font-weight: 720;
}

.category-bento,
.scenario-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
}

.category-card,
.scenario-card {
    padding: 22px;
    transition: transform .18s ease, box-shadow .18s ease;
}

.category-card:hover,
.scenario-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-soft);
}

.category-card.large {
    background:
        linear-gradient(135deg, rgba(70,139,223,0.15), rgba(255,255,255,0.92)),
        #ffffff;
}

.bento-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
}

.bento-grid .feature-card {
    min-height: 180px;
}

.feature-card.big {
    background: linear-gradient(135deg, rgba(70,139,223,0.13), rgba(255,255,255,0.96));
}

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

.security-copy {
    padding: 28px;
    border-radius: var(--radius-lg);
    background: linear-gradient(180deg, rgba(70,139,223,0.10), rgba(255,255,255,0.92));
    border: 1px solid var(--line);
}

.security-copy h2 {
    margin: 0 0 12px;
    font-size: clamp(26px, 4.6vw, 42px);
    line-height: 1.12;
    letter-spacing: -0.04em;
}

.security-copy p {
    color: var(--muted);
}

.principle-list {
    display: grid;
    gap: 12px;
}

.principle-card {
    padding: 18px;
}

.faq-list {
    display: grid;
    gap: 12px;
}

.faq-item {
    padding: 0;
    overflow: hidden;
}

.faq-item summary {
    cursor: pointer;
    padding: 18px 20px;
    font-weight: 760;
    list-style: none;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item p {
    margin: 0;
    padding: 0 20px 20px;
    color: var(--muted);
}

.cta-section {
    margin: 50px auto 70px;
    text-align: center;
    padding: 34px 22px;
    border: 1px solid rgba(70,139,223,0.16);
    border-radius: 32px;
    background:
        radial-gradient(circle at 50% 0%, rgba(70,139,223,0.16), transparent 46%),
        linear-gradient(180deg, rgba(255,255,255,0.96), rgba(236,245,255,0.9));
    box-shadow: var(--shadow-soft);
}

.cta-section h2 {
    margin: 0 0 10px;
    font-size: clamp(26px, 5vw, 42px);
    letter-spacing: -0.04em;
    line-height: 1.12;
}

.cta-section p {
    max-width: 690px;
    margin: 0 auto 20px;
    color: var(--muted);
}

.site-footer {
    border-top: 1px solid var(--line);
    background: rgba(255,255,255,0.72);
}

.footer-shell {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
    padding: 34px 0;
    display: grid;
    gap: 22px;
}

.footer-brand {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.footer-brand img {
    width: 42px;
    height: 42px;
    border-radius: 14px;
}

.footer-brand p {
    margin: 4px 0 0;
    color: var(--muted);
    max-width: 520px;
}

.footer-links {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.footer-links a {
    color: var(--muted);
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-bottom {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
    padding: 18px 0 30px;
    border-top: 1px solid var(--line);
    display: grid;
    gap: 6px;
    color: #7b8798;
    font-size: 13px;
}

.article-shell {
    padding: 54px 0 70px;
}

.article-hero {
    max-width: 850px;
    margin: 0 auto 28px;
    text-align: center;
}

.article-hero.compact h1 {
    font-size: clamp(32px, 6vw, 56px);
}

.page-summary {
    color: var(--muted);
    font-size: 17px;
    max-width: 760px;
    margin: 0 auto 22px;
}

.article-layout {
    display: grid;
    gap: 16px;
    align-items: start;
}

.article-card {
    padding: 24px;
    background: rgba(255,255,255,0.92);
}

.article-card h2 {
    margin-top: 24px;
}

.article-card h2:first-child {
    margin-top: 0;
}

.article-card ul,
.article-card ol {
    color: var(--muted);
    padding-left: 20px;
}

.tip-grid {
    display: grid;
    gap: 12px;
}

.side-card {
    padding: 20px;
}

.check-list {
    display: grid;
    gap: 10px;
    padding: 0;
    margin: 14px 0 0;
    list-style: none;
}

.check-list li {
    padding: 12px 14px;
    border-radius: 14px;
    background: var(--primary-lighter);
    color: #43536a;
}

.process-steps {
    counter-reset: docStep;
    display: grid;
    gap: 12px;
    margin: 18px 0;
}

.process-steps .process-step {
    counter-increment: docStep;
    padding: 16px;
    border-radius: 18px;
    border: 1px solid var(--line);
    background: #fff;
}

.process-steps .process-step::before {
    content: counter(docStep);
    width: 30px;
    height: 30px;
    display: inline-grid;
    place-items: center;
    margin-right: 10px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
}

.download-steps {
    display: grid;
    gap: 14px;
    margin: 24px 0;
}

.download-panel {
    padding: 22px;
    background: linear-gradient(135deg, rgba(70,139,223,0.10), #fff);
}

.about-grid {
    display: grid;
    gap: 14px;
}

.about-card {
    padding: 24px;
}

.page-title {
    padding: 54px 0 10px;
    text-align: center;
}

.page-title p {
    max-width: 740px;
    margin: 0 auto;
    color: var(--muted);
}

@media (min-width: 700px) {
    .capability-grid,
    .category-bento,
    .scenario-grid,
    .about-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-shell {
        grid-template-columns: 1.4fr 1fr;
        align-items: start;
    }

    .footer-links {
        justify-self: end;
        min-width: 360px;
    }
}

@media (min-width: 900px) {
    .nav-toggle {
        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 {
        padding: 9px 12px;
        font-size: 14px;
    }

    .centered-hero {
        padding: 100px 0 38px;
    }

    .product-bento {
        grid-template-columns: 1.35fr .65fr;
    }

    .status-stack {
        grid-template-rows: repeat(4, minmax(0, 1fr));
    }

    .status-card:nth-child(2) {
        transform: translateX(-18px);
    }

    .status-card:nth-child(4) {
        transform: translateX(-10px);
    }

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

    .roadmap {
        grid-template-columns: repeat(6, 1fr);
        gap: 12px;
    }

    .step-card:nth-child(even) {
        margin-top: 38px;
    }

    .category-bento {
        grid-template-columns: repeat(4, 1fr);
        grid-auto-rows: minmax(156px, auto);
    }

    .category-card.large {
        grid-column: span 2;
        grid-row: span 2;
    }

    .category-card.wide {
        grid-column: span 2;
    }

    .bento-grid {
        grid-template-columns: repeat(4, 1fr);
        grid-auto-rows: minmax(170px, auto);
    }

    .bento-grid .big {
        grid-column: span 2;
        grid-row: span 2;
    }

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

    .security-layout {
        grid-template-columns: 1.04fr .96fr;
    }

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

    .scenario-card {
        min-height: 210px;
    }

    .article-layout {
        grid-template-columns: minmax(0, 760px) 320px;
        justify-content: center;
    }

    .article-card {
        padding: 34px;
    }

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

    .about-card.wide {
        grid-column: span 2;
    }
}

@media (min-width: 1100px) {
    .site-nav a {
        padding: 10px 14px;
    }
}

@media (max-width: 420px) {
    .page-shell,
    .section-shell,
    .footer-shell,
    .footer-bottom {
        width: min(100% - 24px, 1120px);
    }

    .centered-hero h1,
    .article-hero h1,
    .page-title h1 {
        letter-spacing: -0.045em;
    }

    .download-btn {
        width: 100%;
    }

    .product-card {
        min-height: 320px;
        padding: 18px;
    }

    .product-card img {
        max-height: 340px;
    }
}