:root {
    --color-bg: #ffffff;
    --color-bg-soft: #f7f9fc;
    --color-text: #0b1220;
    --color-muted: #667085;
    --color-border: #e6eaf0;
    --color-accent: #2563eb;
    --color-accent-soft: #eaf1ff;
    --container: 1180px;
    --radius: 14px;
    --shadow-soft: 0 18px 60px rgba(11, 18, 32, 0.06);
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--color-text);
    background: var(--color-bg);
    font-family:
        Inter,
        ui-sans-serif,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

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

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

button,
input,
textarea,
select {
    font: inherit;
}

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

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.skip-link {
    position: absolute;
    top: 12px;
    left: 12px;
    z-index: 1000;
    padding: 10px 14px;
    color: #ffffff;
    background: var(--color-text);
    border-radius: 8px;
    transform: translateY(-160%);
}

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--color-border);
}

.header-inner {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 1.05rem;
    font-weight: 800;
    letter-spacing: 0.24em;
}

.brand-mark {
    color: var(--color-accent);
    font-size: 1.2rem;
    letter-spacing: 0;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 28px;
    font-size: 0.95rem;
}

.site-nav a {
    color: #344054;
}

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

.nav-toggle {
    display: none;
    width: 44px;
    height: 44px;
    padding: 10px;
    border: 0;
    background: transparent;
}

.nav-toggle span[aria-hidden="true"] {
    display: block;
    width: 22px;
    height: 2px;
    margin: 5px auto;
    background: var(--color-text);
}

.hero {
    padding: 96px 0 84px;
}

.hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(420px, 0.95fr);
    gap: 72px;
    align-items: center;
}

.eyebrow {
    margin: 0 0 14px;
    color: #53647b;
    font-family:
        "SFMono-Regular",
        Consolas,
        "Liberation Mono",
        monospace;
    font-size: 0.78rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.hero h1 {
    margin: 0;
    font-size: clamp(3.2rem, 7vw, 6rem);
    line-height: 0.95;
    letter-spacing: -0.055em;
}

.hero h1 span,
.hero h1 strong {
    display: block;
}

.hero h1 strong {
    margin-top: 8px;
    font-weight: 400;
}

.hero-intro {
    max-width: 700px;
    margin: 36px 0 24px;
    color: #283548;
    font-size: clamp(1.05rem, 1.6vw, 1.3rem);
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 10px;
    margin: 0;
    padding: 0;
    list-style: none;
    color: #53647b;
    font-size: 0.9rem;
}

.hero-tags li:not(:last-child)::after {
    content: "/";
    margin-left: 10px;
    color: #b4bdc9;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 22px;
    margin-top: 34px;
}

.hero-visual img {
    display: block;
    width: 100%;
    height: auto;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 0 20px;
    border-radius: 6px;
    font-weight: 700;
}

.button-primary {
    color: #ffffff;
    background: var(--color-text);
}

.button-primary:hover,
.button-primary:focus-visible {
    background: #1d2939;
}

.social-link,
.project-inline-link,
.project-links a {
    color: #344054;
    font-weight: 600;
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.social-link svg {
    width: 21px;
    height: 21px;
    fill: currentColor;
}

.social-link:hover,
.social-link:focus-visible,
.project-inline-link:hover,
.project-inline-link:focus-visible,
.project-links a:hover,
.project-links a:focus-visible {
    color: var(--color-accent);
}

.hero-visual {
    min-width: 0;
}

.network-diagram {
    width: 100%;
    overflow: visible;
}

.diagram-dot-grid {
    fill: url(#dot-grid);
}

.diagram-links path {
    fill: none;
    stroke: #7c8da3;
    stroke-width: 1.5;
    vector-effect: non-scaling-stroke;
}

.diagram-junctions circle {
    fill: #ffffff;
    stroke: var(--color-accent);
    stroke-width: 1.4;
    vector-effect: non-scaling-stroke;
}

.diagram-node rect,
.diagram-zone rect,
.diagram-router circle {
    fill: rgba(255, 255, 255, 0.95);
    stroke: #8d9aad;
    stroke-width: 1.15;
    vector-effect: non-scaling-stroke;
}

.diagram-zone rect {
    fill: rgba(255, 255, 255, 0.55);
    stroke-dasharray: 5 5;
}

.diagram-router path {
    fill: none;
    stroke: #23344a;
    stroke-width: 1.5;
    stroke-linecap: round;
    vector-effect: non-scaling-stroke;
}

.diagram-node text,
.diagram-zone text,
.diagram-label {
    fill: #314158;
    font-family:
        "SFMono-Regular",
        Consolas,
        "Liberation Mono",
        monospace;
    font-size: 13px;
}

.diagram-label {
    fill: #3b5f8a;
}

.section {
    padding: 88px 0;
}

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

.section-heading {
    margin-bottom: 42px;
}

.section-heading-wide {
    display: flex;
    justify-content: space-between;
    gap: 40px;
    align-items: end;
}

.section-heading h2,
.contact-section h2 {
    margin: 0;
    font-size: clamp(2rem, 4vw, 3.4rem);
    line-height: 1.05;
    letter-spacing: -0.04em;
}

.section-heading p {
    max-width: 760px;
    margin: 14px 0 0;
    color: var(--color-muted);
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 48px 54px;
}

.expertise-item h3,
.missions-grid h3,
.project-card h3 {
    margin: 0 0 10px;
    font-size: 1.1rem;
}

.expertise-item p,
.missions-grid p,
.project-card p,
.contact-copy p {
    margin: 0;
    color: var(--color-muted);
}

.missions-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 42px;
}

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

.project-card {
    display: flex;
    min-height: 100%;
    flex-direction: column;
    padding: 28px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: #ffffff;
}

.project-card-wide {
    grid-column: 1 / -1;
}

.stack-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 22px 0 0;
    padding: 0;
    list-style: none;
}

.stack-list li {
    padding: 5px 9px;
    color: #526174;
    background: #f1f4f8;
    border-radius: 6px;
    font-size: 0.78rem;
}

.project-links {
    display: flex;
    flex-wrap: wrap;
    gap: 22px;
    margin-top: 26px;
}

.project-inline-link {
    margin-top: auto;
    padding-top: 24px;
}

.contact-section {
    display: grid;
    grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.92fr);
    min-height: 340px;
    background: #f7f9fc;
}

.contact-visual {
    height: 370px;
    overflow: hidden;
    background:
        linear-gradient(180deg, #edf2f7 0%, #dbe4ee 100%);
}

.contact-visual img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center center;
    display: block;
}

.contact-ridge-back {
    fill: #c7d1df;
}

.contact-ridge {
    fill: #8f9eb2;
}

.contact-panel {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 64px clamp(32px, 6vw, 92px);
}

.contact-panel h2 {
    margin: 0;
    font-size: clamp(2.3rem, 4vw, 4rem);
    line-height: 1;
    letter-spacing: -0.045em;
}

.contact-panel > p:not(.eyebrow) {
    max-width: 520px;
    margin: 20px 0 0;
    color: var(--color-muted);
}

.contact-panel .button {
    align-self: flex-start;
    margin-top: 26px;
}

.site-footer {
    padding: 24px 0;
    border-top: 1px solid var(--color-border);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    color: var(--color-muted);
    font-size: 0.9rem;
}

.footer-inner p {
    margin: 0;
}

:focus-visible {
    outline: 3px solid rgba(37, 99, 235, 0.3);
    outline-offset: 3px;
}

@media (max-width: 980px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .hero-visual {
        max-width: 760px;
    }

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

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

    .projects-grid {
        grid-template-columns: 1fr 1fr;
    }

    .project-card-wide {
        grid-column: 1 / -1;
    }
}

@media (max-width: 760px) {
    .container {
        width: min(calc(100% - 28px), var(--container));
    }

    .header-inner {
        min-height: 64px;
    }

    .nav-toggle {
        display: inline-block;
    }

    .site-nav {
        position: absolute;
        top: 64px;
        right: 14px;
        left: 14px;
        display: none;
        padding: 14px;
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
        background: #ffffff;
        border: 1px solid var(--color-border);
        border-radius: 12px;
        box-shadow: var(--shadow-soft);
    }

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

    .site-nav a {
        padding: 12px 10px;
    }

    .hero {
        padding: 64px 0;
    }

    .hero-grid {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        font-size: clamp(3rem, 15vw, 4.7rem);
    }

    .hero-tags {
        gap: 8px 12px;
    }

    .hero-tags li::after {
        display: none;
    }

    .section {
        padding: 64px 0;
    }

    .expertise-grid,
    .missions-grid,
    .projects-grid {
        grid-template-columns: 1fr;
    }

    .project-card-wide {
        grid-column: auto;
    }

    .contact-section {
        grid-template-columns: 1fr;
    }

    .contact-visual {
        min-height: 220px;
    }

    .contact-panel {
        padding: 48px 24px 56px;
    }

    .footer-inner {
        flex-direction: column;
        gap: 8px;
    }
}

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

    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}


/* Tabler pictograms */
.icon-wrap {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    width: 42px;
    height: 42px;
    margin-bottom: 16px;
}

.icon-wrap .ti {
    color: var(--color-text);
    font-size: 2rem;
    line-height: 1;
}

.hero-actions .ti {
    font-size: 1.2rem;
    line-height: 1;
}

.hero-actions .text-link {
    display: inline-flex;
    align-items: center;
    gap: 7px;
}

/* Hero network diagram */
.network-diagram {
    overflow: visible;
}

.diagram-grid path {
    stroke: #edf1f5;
    stroke-width: 1;
    stroke-dasharray: 2 6;
}

.diagram-links path {
    fill: none;
    stroke: #7c8897;
    stroke-width: 1.2;
}

.diagram-accent-lines path {
    fill: none;
    stroke: #2563eb;
    stroke-width: 1.5;
}

.diagram-node rect,
.diagram-zone rect {
    fill: rgba(255, 255, 255, 0.94);
    stroke: #8e9aaa;
    stroke-width: 1.1;
}

.diagram-zone rect {
    stroke-dasharray: 4 5;
}

.diagram-node text,
.diagram-zone text,
.diagram-label {
    fill: #334155;
    font-family:
        "SFMono-Regular",
        Consolas,
        "Liberation Mono",
        monospace;
    font-size: 13px;
}

.diagram-zone text {
    font-size: 12px;
    letter-spacing: 0.03em;
}

.diagram-label {
    fill: #334155;
}

.diagram-core circle {
    fill: #ffffff;
    stroke: #1f2937;
    stroke-width: 1.25;
}

.diagram-core path {
    stroke: #1f2937;
    stroke-width: 1.1;
    stroke-linecap: round;
}

.diagram-points circle {
    fill: #2563eb;
}

@media (max-width: 760px) {
    .icon-wrap {
        width: 36px;
        height: 36px;
        margin-bottom: 12px;
    }
}

@media (max-width: 760px) {
    .icon-wrap .ti {
        font-size: 1.8rem;
    }
}


/* Hero topology — aligned with the validated visual mockup */
.hero-visual {
    min-width: 0;
}

.network-diagram {
    width: 100%;
    height: auto;
    overflow: visible;
}

@media (max-width: 980px) {
    .hero-visual {
        max-width: 720px;
        margin-inline: auto;
    }
}

@media (max-width: 560px) {
    .network-diagram {
        min-width: 520px;
    }

    .hero-visual {
        overflow-x: auto;
        padding-bottom: 8px;
    }
}


/* Icon-led content blocks — aligned with the validated mockup */
.expertise-item,
.mission-item {
    display: grid;
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 18px;
    align-items: start;
}

.section-item-icon {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    width: 48px;
    min-height: 48px;
    padding-top: 1px;
}

.section-item-icon .ti {
    color: var(--color-text);
    font-size: 2.45rem;
    line-height: 1;
}

.section-item-content {
    min-width: 0;
}

.section-item-content h3 {
    margin-top: 0;
}

/* Open source project icons */
.project-layout {
    display: grid;
    grid-template-columns: 46px minmax(0, 1fr);
    gap: 18px;
    align-items: start;
    min-height: 100%;
}

.project-icon {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    width: 46px;
    padding-top: 1px;
}

.project-icon .ti {
    color: var(--color-text);
    font-size: 2.35rem;
    line-height: 1;
}

.project-content {
    display: flex;
    min-width: 0;
    min-height: 100%;
    flex-direction: column;
}

.project-links a,
.project-inline-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.project-links a .ti-brand-github,
.project-inline-link .ti-brand-github,
.project-links a .ti-file-text {
    font-size: 1.2rem;
}

.project-links a .ti-arrow-right,
.project-inline-link .ti-arrow-right {
    margin-left: 3px;
    font-size: 1rem;
}

.project-inline-link {
    align-self: flex-start;
}

.legal-page {
    padding: 80px 0 110px;
}

.legal-container {
    max-width: 820px;
}

.legal-header {
    margin-bottom: 64px;
}

.legal-header h1 {
    margin: 0;
    font-size: clamp(2.8rem, 6vw, 4.8rem);
    line-height: 1;
    letter-spacing: -0.05em;
}

.legal-updated {
    margin-top: 20px;
    color: var(--color-muted);
    font-size: 0.9rem;
}

.legal-page section {
    margin-top: 48px;
}

.legal-page section:first-of-type {
    margin-top: 0;
}

.legal-page h2 {
    margin: 0 0 16px;
    font-size: 1.35rem;
}

.legal-page p,
.legal-page li,
.legal-page address {
    color: var(--color-muted);
}

.legal-page address {
    margin: 20px 0;
    font-style: normal;
}

.legal-page ul {
    padding-left: 1.25rem;
}

.legal-page a {
    color: var(--color-text);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.footer-legal {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

@media (max-width: 760px) {
    .expertise-item,
    .mission-item {
        grid-template-columns: 42px minmax(0, 1fr);
        gap: 14px;
    }

    .section-item-icon {
        width: 42px;
        min-height: 42px;
    }

    .section-item-icon .ti {
        font-size: 2.1rem;
    }

    .project-layout {
        grid-template-columns: 40px minmax(0, 1fr);
        gap: 14px;
    }

    .project-icon {
        width: 40px;
    }

    .project-icon .ti {
        font-size: 2rem;
    }
}