:root {
    color-scheme: light;
    --ink: #101418;
    --muted: #5d6872;
    --weak: #7c8791;
    --line: #dce2e7;
    --soft: #f3f5f7;
    --white: #ffffff;
    --blue: #1261d8;
    --blue-dark: #0b46a0;
    --green: #0f8059;
    --red: #bf3f35;
    --max: 1160px;
    --header-height: 72px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--white);
    color: var(--ink);
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
    font-size: 16px;
    line-height: 1.7;
    letter-spacing: 0;
    text-rendering: optimizeLegibility;
}

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

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

button,
input,
textarea {
    font: inherit;
    letter-spacing: 0;
}

.shell {
    width: min(calc(100% - 48px), var(--max));
    margin: 0 auto;
}

.skip-link {
    position: fixed;
    top: 10px;
    left: 10px;
    z-index: 100;
    padding: 8px 12px;
    transform: translateY(-160%);
    border-radius: 4px;
    background: var(--ink);
    color: var(--white);
}

.skip-link:focus {
    transform: translateY(0);
}

.site-header {
    position: relative;
    z-index: 20;
    height: var(--header-height);
    border-bottom: 1px solid rgba(255, 255, 255, 0.22);
    background: #101418;
    color: var(--white);
}

.site-header .shell {
    display: flex;
    height: 100%;
    align-items: center;
    justify-content: space-between;
    gap: 28px;
}

.wordmark {
    display: flex;
    min-width: 0;
    align-items: baseline;
    gap: 12px;
    font-weight: 760;
    white-space: nowrap;
}

.wordmark span {
    color: #9fb0bf;
    font-size: 12px;
    font-weight: 650;
}

.primary-nav {
    display: flex;
    align-items: center;
    gap: 28px;
    font-size: 14px;
    font-weight: 650;
}

.primary-nav a {
    color: #d8e0e7;
}

.primary-nav a:hover,
.primary-nav a:focus-visible {
    color: var(--white);
}

.primary-nav .nav-action {
    padding: 9px 14px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 4px;
    color: var(--white);
}

.hero {
    position: relative;
    display: flex;
    min-height: min(74vh, 690px);
    align-items: center;
    overflow: hidden;
    background: #12171b url("/assets/network-infrastructure.jpg") center center / cover no-repeat;
    color: var(--white);
}

.hero::before {
    position: absolute;
    inset: 0;
    background: rgba(8, 13, 17, 0.58);
    content: "";
}

.hero .shell {
    position: relative;
    z-index: 1;
    padding-top: 68px;
    padding-bottom: 72px;
}

.hero-copy {
    max-width: 820px;
}

.hero h1 {
    max-width: 820px;
    margin: 0;
    font-size: 52px;
    font-weight: 780;
    line-height: 1.16;
    letter-spacing: 0;
}

.hero-lead {
    max-width: 700px;
    margin: 24px 0 0;
    color: #e6ebef;
    font-size: 20px;
    line-height: 1.7;
}

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

.button {
    display: inline-flex;
    min-height: 46px;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 11px 18px;
    border: 1px solid transparent;
    border-radius: 4px;
    font-size: 15px;
    font-weight: 720;
}

.button-primary {
    background: var(--blue);
    color: var(--white);
}

.button-primary:hover,
.button-primary:focus-visible {
    background: #2875e2;
}

.button-secondary {
    border-color: rgba(255, 255, 255, 0.58);
    background: rgba(16, 20, 24, 0.24);
    color: var(--white);
}

.button-secondary:hover,
.button-secondary:focus-visible {
    border-color: var(--white);
    background: rgba(16, 20, 24, 0.5);
}

.hero-facts {
    display: grid;
    max-width: 800px;
    margin: 50px 0 0;
    padding: 24px 0 0;
    border-top: 1px solid rgba(255, 255, 255, 0.3);
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.hero-facts div {
    padding-right: 28px;
}

.hero-facts div + div {
    padding-left: 28px;
    border-left: 1px solid rgba(255, 255, 255, 0.24);
}

.hero-facts dt {
    color: #aebbc6;
    font-size: 13px;
    font-weight: 650;
}

.hero-facts dd {
    margin: 4px 0 0;
    font-size: 17px;
    font-weight: 720;
}

.section {
    padding: 96px 0;
}

.section-soft {
    background: var(--soft);
}

.section-dark {
    background: #151a1e;
    color: var(--white);
}

.section-heading {
    display: grid;
    align-items: start;
    gap: 42px;
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
}

.section h2,
.page-hero h1,
.article h1 {
    margin: 0;
    font-size: 38px;
    font-weight: 780;
    line-height: 1.25;
    letter-spacing: 0;
}

.section-heading p {
    max-width: 690px;
    margin: 0;
    color: var(--muted);
    font-size: 18px;
}

.section-dark .section-heading p {
    color: #bac4cc;
}

.company-points {
    display: grid;
    margin-top: 64px;
    border-top: 1px solid var(--line);
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.company-point {
    min-height: 176px;
    padding: 30px 34px 0 0;
    border-bottom: 1px solid var(--line);
}

.company-point + .company-point {
    padding-left: 34px;
    border-left: 1px solid var(--line);
}

.company-point strong {
    display: block;
    margin-bottom: 10px;
    font-size: 18px;
}

.company-point p {
    margin: 0;
    color: var(--muted);
}

.capability-list {
    margin-top: 56px;
    border-top: 1px solid #353d43;
}

.capability-row {
    display: grid;
    gap: 32px;
    align-items: start;
    padding: 30px 0;
    border-bottom: 1px solid #353d43;
    grid-template-columns: 78px minmax(180px, 0.7fr) minmax(0, 1.3fr);
}

.capability-number {
    color: #68a4f4;
    font-size: 14px;
    font-weight: 760;
}

.capability-row h3 {
    margin: 0;
    font-size: 21px;
}

.capability-row p {
    margin: 0;
    color: #b8c2ca;
}

.product-layout {
    display: grid;
    gap: 70px;
    align-items: center;
    grid-template-columns: minmax(0, 1.05fr) minmax(300px, 0.7fr);
}

.product-copy h2 {
    margin-bottom: 22px;
}

.product-copy > p {
    max-width: 650px;
    margin: 0;
    color: var(--muted);
    font-size: 18px;
}

.product-list {
    margin: 34px 0 0;
    padding: 0;
    border-top: 1px solid var(--line);
    list-style: none;
}

.product-list li {
    display: grid;
    gap: 14px;
    padding: 17px 0;
    border-bottom: 1px solid var(--line);
    grid-template-columns: 26px 1fr;
}

.product-list span {
    color: var(--green);
    font-weight: 800;
}

.product-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 30px;
}

.product-actions .button-secondary,
.page-actions .button-secondary {
    border-color: var(--line);
    background: var(--white);
    color: var(--ink);
}

.product-shot {
    width: min(100%, 390px);
    justify-self: end;
    padding: 10px;
    border: 1px solid #ccd4da;
    border-radius: 8px;
    background: #e9edf1;
    box-shadow: 0 22px 54px rgba(16, 20, 24, 0.17);
}

.product-shot img {
    width: 100%;
    border-radius: 5px;
}

.principles {
    display: grid;
    margin-top: 56px;
    border-top: 1px solid var(--line);
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.principle {
    padding: 28px 34px 0 0;
}

.principle + .principle {
    padding-left: 34px;
    border-left: 1px solid var(--line);
}

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

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

.contact-layout {
    display: grid;
    gap: 64px;
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
}

.contact-copy p {
    max-width: 520px;
    margin: 18px 0 0;
    color: var(--muted);
    font-size: 18px;
}

.contact-list {
    margin: 0;
    border-top: 1px solid var(--line);
}

.contact-list div {
    display: grid;
    gap: 18px;
    padding: 18px 0;
    border-bottom: 1px solid var(--line);
    grid-template-columns: 94px 1fr;
}

.contact-list dt {
    color: var(--weak);
    font-size: 14px;
    font-weight: 650;
}

.contact-list dd {
    margin: 0;
    font-weight: 680;
    overflow-wrap: anywhere;
}

.contact-list a {
    color: var(--blue-dark);
}

.site-footer {
    padding: 44px 0 34px;
    border-top: 1px solid var(--line);
    background: var(--white);
}

.footer-main,
.footer-bottom {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 30px;
}

.footer-title {
    font-weight: 760;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 22px;
    color: var(--muted);
    font-size: 14px;
}

.footer-bottom {
    margin-top: 34px;
    padding-top: 24px;
    border-top: 1px solid var(--line);
    color: var(--weak);
    font-size: 13px;
}

.page-hero {
    padding: 74px 0 70px;
    background: #eef3f8;
}

.page-hero p {
    max-width: 720px;
    margin: 18px 0 0;
    color: var(--muted);
    font-size: 18px;
}

.page-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 28px;
}

.article-wrap {
    padding: 72px 0 96px;
}

.article {
    width: min(100%, 820px);
}

.article-meta {
    margin: 12px 0 36px;
    color: var(--weak);
    font-size: 14px;
}

.article-meta span + span::before {
    content: " · ";
}

.article-meta time {
    white-space: nowrap;
}

.article h2 {
    margin: 42px 0 12px;
    padding-top: 30px;
    border-top: 1px solid var(--line);
    font-size: 23px;
    line-height: 1.35;
}

.article h3 {
    margin: 28px 0 8px;
    font-size: 18px;
}

.article p,
.article li {
    color: #3f4951;
}

.article ul,
.article ol {
    padding-left: 22px;
}

.article a {
    color: var(--blue-dark);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.notice {
    margin: 30px 0;
    padding: 18px 20px;
    border-left: 4px solid var(--green);
    background: #edf7f2;
    color: #24483a;
}

.apply-grid {
    display: grid;
    gap: 44px;
    padding: 72px 0 96px;
    grid-template-columns: minmax(0, 1fr) minmax(320px, 0.75fr);
}

.apply-content h2,
.support-content h2 {
    margin: 0 0 18px;
    font-size: 30px;
}

.apply-content > p,
.support-content > p {
    color: var(--muted);
    font-size: 17px;
}

.requirements {
    margin: 34px 0 0;
    padding: 0;
    border-top: 1px solid var(--line);
    list-style: none;
}

.requirements li {
    padding: 16px 0;
    border-bottom: 1px solid var(--line);
}

.contact-panel {
    align-self: start;
    padding: 28px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--soft);
}

.contact-panel h2 {
    margin: 0;
    font-size: 22px;
}

.contact-panel p {
    margin: 10px 0 0;
    color: var(--muted);
}

.contact-panel .button {
    width: 100%;
    margin-top: 18px;
}

.contact-panel .button-secondary {
    border-color: var(--line);
    background: var(--white);
    color: var(--ink);
}

.support-list {
    margin-top: 38px;
    border-top: 1px solid var(--line);
}

.support-contacts {
    margin-top: 48px;
}

.support-item {
    display: grid;
    gap: 24px;
    padding: 24px 0;
    border-bottom: 1px solid var(--line);
    grid-template-columns: 150px 1fr;
}

.support-item h3,
.support-item p {
    margin: 0;
}

.support-item p {
    color: var(--muted);
}

:focus-visible {
    outline: 3px solid #6aa6f7;
    outline-offset: 3px;
}

@media (max-width: 860px) {
    :root {
        --header-height: 64px;
    }

    .shell {
        width: min(calc(100% - 32px), var(--max));
    }

    .wordmark span,
    .primary-nav a:not(.nav-action) {
        display: none;
    }

    .hero {
        min-height: 690px;
        background-position: 58% center;
    }

    .hero .shell {
        padding-top: 52px;
        padding-bottom: 54px;
    }

    .hero h1 {
        max-width: 650px;
        font-size: 40px;
    }

    .hero-lead {
        font-size: 18px;
    }

    .section {
        padding: 76px 0;
    }

    .section-heading,
    .product-layout,
    .contact-layout,
    .apply-grid {
        grid-template-columns: 1fr;
    }

    .product-shot {
        justify-self: center;
    }

    .company-points,
    .principles {
        grid-template-columns: 1fr;
    }

    .company-point,
    .company-point + .company-point,
    .principle,
    .principle + .principle {
        min-height: 0;
        padding: 24px 0;
        border-left: 0;
        border-bottom: 1px solid var(--line);
    }

    .capability-row {
        grid-template-columns: 54px 1fr;
    }

    .capability-row p {
        grid-column: 2;
    }
}

@media (max-width: 560px) {
    .hero {
        min-height: 660px;
    }

    .hero h1 {
        font-size: 34px;
    }

    .hero-lead {
        font-size: 17px;
    }

    .hero-actions,
    .product-actions,
    .page-actions {
        align-items: stretch;
        flex-direction: column;
    }

    .hero-facts {
        gap: 16px;
        grid-template-columns: 1fr;
    }

    .hero-facts div,
    .hero-facts div + div {
        padding: 0;
        border-left: 0;
    }

    .section h2,
    .page-hero h1,
    .article h1 {
        font-size: 30px;
    }

    .section-heading {
        gap: 20px;
    }

    .capability-row {
        gap: 12px;
        grid-template-columns: 38px 1fr;
    }

    .contact-list div,
    .support-item {
        gap: 5px;
        grid-template-columns: 1fr;
    }

    .contact-panel {
        padding: 22px;
    }

    .article-meta span {
        display: block;
    }

    .article-meta span + span::before {
        content: none;
    }

    .footer-main,
    .footer-bottom {
        align-items: flex-start;
        flex-direction: column;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}