:root {
    --bg: #111111;
    --surface: #181818;
    --text: #e2e2e2;
    --muted: #666;
    --border: #242424;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 1rem;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

/* ─── NAV ─── */

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.8rem 4rem;
    border-bottom: 1px solid var(--border);
}

.nav-name {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

.nav-links a {
    font-size: 0.85rem;
    color: var(--muted);
    text-decoration: none;
    transition: color 0.2s;
}

.nav-links a:hover { color: var(--text); }
.nav-active { color: var(--text) !important; }

/* ─── HEADER ─── */

.lab-header {
    padding: 5rem 4rem 4rem;
    border-bottom: 1px solid var(--border);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.eyebrow {
    font-size: 0.75rem;
    color: var(--muted);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
}

h1 {
    font-size: clamp(2.4rem, 4vw, 3.5rem);
    font-weight: 600;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
}

h1 em {
    font-style: italic;
    font-weight: 300;
}

.tagline {
    font-size: 1rem;
    color: var(--muted);
    font-weight: 300;
    line-height: 1.8;
}

/* ─── MAIN CONTENT ─── */

.lab-content {
    padding: 4rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* ─── NODE CARD ─── */

.node {
    border: 1px solid var(--border);
    border-radius: 6px;
    overflow: hidden;
}

.node-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 2rem 2.5rem;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
}

.node-label {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--muted);
    display: block;
    margin-bottom: 0.4rem;
}

.node-header h2 {
    font-size: 1.3rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.node-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: var(--muted);
    padding-top: 0.2rem;
}

.status-dot {
    width: 7px;
    height: 7px;
    background: #4a4a4a;
    border-radius: 50%;
}

/* ─── SPECS ─── */

.node-specs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    border-bottom: 1px solid var(--border);
}

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

.node-purpose {
    padding: 1.4rem 2.5rem;
    background: rgba(255, 255, 255, 0.02);
    border-top: 1px solid var(--border);
    font-size: 0.88rem;
    color: var(--muted);
    line-height: 1.6;
}

.node-purpose strong {
    color: var(--text);
    font-weight: 500;
}

.spec-group {
    padding: 1.8rem 2.5rem;
    border-right: 1px solid var(--border);
}

.spec-group:last-child { border-right: none; }

.spec-label {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--muted);
    margin-bottom: 0.5rem;
}

.spec-value {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 0.2rem;
}

.spec-sub {
    font-size: 0.8rem;
    color: var(--muted);
    font-weight: 300;
}

/* ─── STORAGE ─── */

.storage-section {
    padding: 2rem 2.5rem;
}

.storage-section .spec-label {
    margin-bottom: 1.5rem;
}

.storage-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
}

.disk {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 1.5rem 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 0.4rem;
}

.disk-icon {
    width: 36px;
    height: 36px;
    color: var(--muted);
    margin-bottom: 0.5rem;
}

.disk-icon svg { width: 100%; height: 100%; }

.disk-name {
    font-size: 0.75rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.disk-size {
    font-size: 1.3rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.disk-type {
    font-size: 0.75rem;
    color: var(--muted);
    font-weight: 300;
}

/* ─── SERVICES ─── */

.services-section {
    border-top: 1px solid var(--border);
    padding: 4rem;
}

.services-inner {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3.5rem;
    align-items: start;
}

.services-node-label {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--muted);
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}

.services-list {
    display: flex;
    flex-direction: column;
}

.service-row {
    display: grid;
    grid-template-columns: 140px 1fr auto;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.875rem;
}

.service-name {
    font-weight: 500;
    white-space: nowrap;
}

.service-desc {
    color: var(--muted);
    font-weight: 300;
    font-size: 0.82rem;
}

.service-endpoint {
    font-size: 0.78rem;
    white-space: nowrap;
    text-align: right;
}

.service-endpoint.public {
    color: var(--text);
    text-decoration: none;
    transition: opacity 0.2s;
}

.service-endpoint.public:hover { opacity: 0.6; }

.service-endpoint.internal {
    color: var(--muted);
}

/* ─── FOOTER ─── */

footer {
    padding: 1.5rem 4rem;
    border-top: 1px solid var(--border);
    font-size: 0.8rem;
    color: var(--muted);
    display: flex;
    justify-content: space-between;
}

footer a {
    color: var(--muted);
    text-decoration: none;
    transition: color 0.2s;
}

footer a:hover { color: var(--text); }

/* ─── TABLET ─── */

@media (max-width: 1050px) {
    .services-inner { grid-template-columns: 1fr; gap: 2.5rem; }
    .node-specs.specs-4 { grid-template-columns: repeat(2, 1fr); }
    .node-specs.specs-4 .spec-group:nth-child(2) { border-right: none; }
    .node-specs.specs-4 .spec-group:nth-child(3) { border-top: 1px solid var(--border); }
    .node-specs.specs-4 .spec-group:nth-child(4) { border-top: 1px solid var(--border); border-right: none; }
}

@media (max-width: 900px) {
    nav { padding: 1.5rem 2rem; }
    .lab-header { padding: 4rem 2rem 3rem; grid-template-columns: 1fr; gap: 2.5rem; }
    .lab-content { padding: 2rem; }

    .node-specs { grid-template-columns: repeat(2, 1fr); }
    .spec-group:nth-child(2) { border-right: none; }
    .spec-group:nth-child(3) { border-top: 1px solid var(--border); border-right: none; }

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

    .services-section { padding: 2rem; }
    .service-row { grid-template-columns: 120px 1fr auto; }

    footer { padding: 1.5rem 2rem; }
}

/* ─── MOBILE ─── */

@media (max-width: 520px) {
    nav { padding: 1.2rem; }
    .nav-links { gap: 1.2rem; }

    .lab-header { padding: 3rem 1.2rem 2.5rem; }
    h1 { font-size: 2.2rem; }

    .lab-content { padding: 1.2rem; gap: 1.2rem; }

    .node-header { padding: 1.5rem; flex-direction: column; gap: 1rem; }
    .node-specs { grid-template-columns: 1fr; }
    .node-specs.specs-4 { grid-template-columns: 1fr; }
    .spec-group {
        padding: 1.2rem 1.5rem;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }
    .spec-group:last-child { border-bottom: none; }
    .node-specs.specs-4 .spec-group {
        border-top: none;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }
    .node-specs.specs-4 .spec-group:last-child { border-bottom: none; }

    .node-purpose { padding: 1.2rem 1.5rem; }

    .storage-section { padding: 1.5rem; }
    .storage-grid { grid-template-columns: repeat(2, 1fr); }

    .services-section { padding: 1.2rem; }
    .service-row {
        grid-template-columns: 1fr auto;
        grid-template-rows: auto auto;
    }
    .service-desc { grid-column: 1 / -1; padding-bottom: 0.2rem; }

    footer { padding: 1.2rem; flex-direction: column; gap: 0.3rem; }
}