:root {
    --ink: #14213d;
    --muted: #5d6878;
    --line: #e7ecf3;
    --blue: #1167d8;
    --cyan: #00a6d6;
    --green: #13a66f;
    --bg: #f7f9fc;
    --white: #fff;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    color: var(--ink);
    font-family: Arial, "Microsoft YaHei", sans-serif;
    line-height: 1.65;
    background: var(--white);
}

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

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

.container {
    width: min(1180px, calc(100% - 40px));
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255, 255, 255, .96);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(10px);
}

.header-inner {
    min-height: 74px;
    display: flex;
    align-items: center;
    gap: 28px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    color: var(--ink);
    white-space: nowrap;
}

.brand img {
    width: 210px;
    height: auto;
}

.main-nav {
    display: flex;
    flex: 1;
    justify-content: center;
    gap: 18px;
    font-size: 15px;
}

.main-nav a {
    color: #223047;
}

.main-nav a:hover {
    color: var(--blue);
}

.nav-cta,
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0 18px;
    border-radius: 6px;
    font-weight: 700;
    border: 1px solid transparent;
}

.nav-cta,
.btn.primary {
    background: var(--blue);
    color: #fff;
}

.btn.ghost {
    color: var(--ink);
    border-color: #bfd2ee;
    background: #fff;
}

.hero {
    position: relative;
    min-height: 620px;
    display: flex;
    align-items: center;
    overflow: hidden;
    background:
        linear-gradient(90deg, rgba(5, 20, 42, .84), rgba(5, 20, 42, .45)),
        url("../img/hero-tech.png") center/cover no-repeat,
        #0c1d35;
    color: #fff;
}

.hero-media {
    position: absolute;
    inset: 0;
    opacity: .22;
}

.hero-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-content {
    position: relative;
    padding: 92px 0;
}

.eyebrow {
    margin: 0 0 12px;
    color: var(--cyan);
    font-weight: 700;
    text-transform: uppercase;
}

.hero h1 {
    margin: 0;
    max-width: 720px;
    font-size: 64px;
    line-height: 1.08;
    letter-spacing: 0;
}

.hero p:not(.eyebrow) {
    max-width: 680px;
    margin: 24px 0 0;
    color: rgba(255, 255, 255, .86);
    font-size: 20px;
}

.hero-actions {
    display: flex;
    gap: 14px;
    margin-top: 34px;
    flex-wrap: wrap;
}

.section {
    padding: 76px 0;
}

.band {
    background: #10233d;
    color: #fff;
}

.band.light {
    background: var(--bg);
    color: var(--ink);
}

.section-head {
    display: flex;
    justify-content: space-between;
    align-items: end;
    gap: 24px;
    margin-bottom: 28px;
}

.section-head h2 {
    margin: 0;
    font-size: 34px;
    letter-spacing: 0;
}

.section-head p {
    max-width: 700px;
    margin: 8px 0 0;
    color: var(--muted);
}

.section-head a {
    color: var(--blue);
    font-weight: 700;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

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

.info-card,
.product-card,
.news-grid a {
    min-height: 210px;
    padding: 24px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
}

.info-card span,
.article-meta span {
    color: var(--green);
    font-size: 13px;
    font-weight: 700;
}

.info-card h3,
.product-card h3 {
    margin: 12px 0 8px;
    font-size: 21px;
}

.info-card p,
.product-card p,
.news-grid span {
    color: var(--muted);
}

.info-card a,
.product-card a {
    display: inline-block;
    margin-top: 10px;
    color: var(--blue);
    font-weight: 700;
}

.ai-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.ai-grid h2 {
    margin: 0;
    font-size: 38px;
}

.ai-grid p {
    color: rgba(255, 255, 255, .76);
}

.ai-points {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.ai-points span {
    padding: 18px;
    border: 1px solid rgba(255, 255, 255, .16);
    border-radius: 8px;
    background: rgba(255, 255, 255, .08);
}

.case-list,
.download-list {
    display: grid;
    gap: 12px;
}

.case-row,
.download-row {
    display: grid;
    grid-template-columns: 220px 160px 1fr;
    align-items: center;
    gap: 20px;
    padding: 20px 24px;
    border: 1px solid var(--line);
    border-radius: 8px;
}

.case-row span,
.download-row span,
.case-row em,
.download-row em {
    color: var(--muted);
    font-style: normal;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
}

.news-grid time {
    display: block;
    color: var(--green);
    font-weight: 700;
    margin-bottom: 10px;
}

.news-grid strong {
    display: block;
    margin-bottom: 8px;
}

.page-banner {
    padding: 84px 0;
    background:
        linear-gradient(90deg, rgba(12, 29, 53, .92), rgba(17, 103, 216, .72)),
        url("../img/hero-tech.png") center/cover no-repeat;
    color: #fff;
}

.page-banner h1 {
    margin: 0;
    font-size: 42px;
}

.page-banner p:last-child {
    max-width: 720px;
    color: rgba(255, 255, 255, .82);
}

.article-wrap {
    max-width: 900px;
}

.article-wrap h2 {
    margin: 8px 0 10px;
    font-size: 34px;
}

.lead {
    color: var(--muted);
    font-size: 18px;
}

.rich-content {
    color: #24324a;
}

.rich-content img {
    border-radius: 8px;
    margin: 18px 0;
}

.article-actions {
    display: flex;
    gap: 12px;
    margin-top: 34px;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 36px;
}

.contact-info,
.contact-form {
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 28px;
    background: #fff;
}

.contact-form {
    display: grid;
    gap: 14px;
}

.contact-form label {
    display: grid;
    gap: 8px;
    font-weight: 700;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    border: 1px solid #ccd6e4;
    border-radius: 6px;
    padding: 12px;
    font: inherit;
}

.form-message {
    padding: 12px;
    background: #edf7f2;
    border: 1px solid #b8e4cf;
    border-radius: 6px;
    color: #087247;
}

.site-footer {
    padding: 42px 0 22px;
    background: #0c1d35;
    color: rgba(255, 255, 255, .76);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
}

.footer-grid strong {
    color: #fff;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 14px;
}

.copyright {
    margin-top: 24px;
    padding-top: 18px;
    border-top: 1px solid rgba(255, 255, 255, .14);
    font-size: 14px;
}

.setup-screen {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 30px;
    background: var(--bg);
}

.setup-screen section {
    max-width: 680px;
    padding: 34px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 8px;
}

.muted {
    color: var(--muted);
}

@media (max-width: 980px) {
    .header-inner {
        flex-wrap: wrap;
        padding: 14px 0;
    }

    .main-nav {
        order: 3;
        width: 100%;
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: 4px;
    }

    .hero h1 {
        font-size: 44px;
    }

    .card-grid,
    .card-grid.four,
    .news-grid,
    .ai-grid,
    .contact-grid,
    .footer-grid {
        grid-template-columns: 1fr;
    }

    .case-row,
    .download-row {
        grid-template-columns: 1fr;
        gap: 6px;
    }

    .footer-links {
        justify-content: flex-start;
    }
}

@media (max-width: 560px) {
    .container {
        width: min(100% - 28px, 1180px);
    }

    .brand img {
        width: 170px;
    }

    .nav-cta {
        display: none;
    }

    .hero {
        min-height: 540px;
    }

    .hero h1,
    .page-banner h1 {
        font-size: 36px;
    }

    .section {
        padding: 54px 0;
    }

    .section-head {
        display: block;
    }
}