/* Engineering Lab hub — visual language aligned with LearningArchitect/Site */
:root {
  --bg: #0a0d14;
  --panel: #121825;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 155, 72, 0.24);
  --grid-line: rgba(255, 255, 255, 0.035);
  --text: #eef2fb;
  --text-muted: #a6afc4;
  --text-low: #7e879c;
  --accent: #ff9550;
  --accent-strong: #ff7236;
  --accent-soft: rgba(255, 149, 80, 0.12);
  --teal: #23c9b4;
  --teal-soft: rgba(35, 201, 180, 0.12);
  --blue: #4f8cff;
  --blue-soft: rgba(79, 140, 255, 0.12);
  --violet: #b47cff;
  --violet-soft: rgba(180, 124, 255, 0.12);
  --shadow: 0 14px 30px rgba(0, 0, 0, 0.26);
  --shadow-hover: 0 18px 38px rgba(0, 0, 0, 0.34);
  --radius-xl: 10px;
  --radius-lg: 8px;
  --radius-sm: 8px;
  --content-width: 1180px;
}

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

html {
  scroll-behavior: smooth;
  background: #07090e;
  overflow-x: clip;
}

body {
  position: relative;
  min-height: 100vh;
  margin: 0;
  overflow-x: clip;
  font-family: "Inter", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 14% 4%, rgba(255, 149, 80, 0.12), transparent 18%),
    radial-gradient(circle at 88% 8%, rgba(35, 201, 180, 0.08), transparent 20%),
    radial-gradient(circle at 50% 28%, rgba(79, 140, 255, 0.035), transparent 26%),
    linear-gradient(180deg, #05070c 0%, #090c12 40%, #090d14 100%);
}

body::before,
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
}

body::before {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent 14%, transparent 84%, rgba(255, 255, 255, 0.015)),
    repeating-linear-gradient(0deg, transparent 0 79px, var(--grid-line) 79px 80px),
    repeating-linear-gradient(90deg, transparent 0 79px, var(--grid-line) 79px 80px);
  opacity: 0.28;
}

body::after {
  background:
    radial-gradient(circle at top center, rgba(255, 149, 80, 0.09), transparent 24%),
    radial-gradient(circle at 85% 16%, rgba(79, 140, 255, 0.045), transparent 18%);
  opacity: 0.9;
}

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

code {
  font-family: "Cascadia Code", Consolas, monospace;
  color: #ffd6b3;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 200;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: #1a120f;
  font-weight: 700;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

.page-shell {
  position: relative;
  isolation: isolate;
  width: 100%;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 14px 16px 40px;
}

.topbar,
.hero-proof,
.stack-card,
.stub-panel,
.footer {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0)),
    linear-gradient(180deg, rgba(10, 14, 22, 0.96), rgba(13, 18, 28, 0.98));
  box-shadow:
    0 18px 40px rgba(0, 0, 0, 0.34),
    inset 0 1px 0 rgba(255, 255, 255, 0.035),
    inset 0 -1px 0 rgba(255, 255, 255, 0.015);
}

.topbar::before,
.hero-proof::before,
.stack-card::before,
.stub-panel::before,
.footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.14), transparent);
  pointer-events: none;
}

.topbar {
  position: sticky;
  top: 12px;
  z-index: 120;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 16px;
  margin-bottom: 18px;
  padding: 12px 16px;
  border-radius: var(--radius-lg);
  min-width: 0;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0)),
    rgba(10, 14, 22, 0.86);
  backdrop-filter: blur(18px);
}

.brand {
  flex: 0 0 auto;
  font-family: "Poppins", sans-serif;
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-shadow: 0 0 18px rgba(255, 149, 80, 0.12);
}

.topbar-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 16px;
  flex: 1 1 12rem;
  min-width: 0;
  color: var(--text-muted);
  font-size: 0.84rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  gap: 2px;
  margin-left: auto;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.03);
}

.lang-switch button {
  min-width: 2.4rem;
  min-height: 1.85rem;
  margin: 0;
  padding: 0 0.55rem;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--text-low);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
}

.lang-switch button:hover {
  color: var(--text);
}

.lang-switch button.is-active {
  background: rgba(255, 149, 80, 0.16);
  color: #ffd0ad;
}

.topbar-links a {
  position: relative;
  padding-bottom: 6px;
}

.topbar-links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  border-radius: 999px;
  background: transparent;
  transition: background 180ms ease;
}

.topbar-links a:hover,
.topbar-links a[aria-current="page"] {
  color: var(--text);
}

.topbar-links a:hover::after,
.topbar-links a[aria-current="page"]::after {
  background: linear-gradient(90deg, var(--accent), var(--teal));
}

.eyebrow,
.brief-label,
.stub-kicker {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  line-height: 1.35;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: "Poppins", sans-serif;
}

h1 {
  max-width: 16ch;
  font-size: clamp(1.9rem, 3.6vw, 2.55rem);
  line-height: 1.1;
  text-wrap: balance;
}

h2 {
  font-size: clamp(1.35rem, 2.4vw, 1.55rem);
  line-height: 1.16;
  font-weight: 700;
}

h3 {
  font-size: 1.16rem;
  line-height: 1.24;
  font-weight: 600;
}

.hero {
  margin-bottom: 22px;
}

.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
  gap: 22px;
  align-items: stretch;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
}

.hero-summary,
.section-heading p,
.stack-card p,
.stub-panel p,
.stub-panel li,
.footer-copy {
  color: var(--text-muted);
  line-height: 1.65;
}

.hero-summary {
  max-width: none;
  margin: 10px 0 0;
}

.hero-proof {
  min-width: 0;
  padding: 16px 18px;
  border-color: rgba(255, 149, 80, 0.18);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at top right, rgba(255, 149, 80, 0.14), transparent 30%),
    linear-gradient(180deg, rgba(255, 149, 80, 0.08), rgba(255, 149, 80, 0.01)),
    linear-gradient(180deg, rgba(10, 14, 22, 0.98), rgba(13, 18, 28, 0.98));
}

.hero-proof-copy {
  display: grid;
  gap: 8px;
}

.hero-proof-copy p {
  position: relative;
  margin: 0;
  padding-left: 16px;
  color: var(--text-muted);
  line-height: 1.5;
  font-size: 0.95rem;
}

.hero-proof-copy p::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--teal));
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin: 14px 0 0;
}

.hero-stat {
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0)),
    rgba(255, 255, 255, 0.02);
}

.hero-stat dt {
  margin-bottom: 4px;
  color: var(--text-low);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-stat dd {
  margin: 0;
  color: var(--text);
  font-family: "Poppins", sans-serif;
  font-size: 1.35rem;
  line-height: 1;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
  max-width: 100%;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  max-width: 100%;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-weight: 700;
  line-height: 1.3;
  text-align: center;
  cursor: pointer;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease, box-shadow 180ms ease;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.button:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-hover);
}

.button-primary {
  border-color: rgba(255, 149, 80, 0.45);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.16), rgba(255, 255, 255, 0) 36%),
    linear-gradient(135deg, #ffb169, var(--accent), var(--accent-strong));
  color: #1a120f;
  box-shadow:
    0 14px 28px rgba(255, 114, 54, 0.18),
    inset 0 1px 0 rgba(255, 245, 236, 0.28);
}

.button-secondary {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0)),
    rgba(255, 255, 255, 0.03);
  border-color: var(--line);
  color: var(--text);
}

.button-ghost {
  background: rgba(255, 255, 255, 0.02);
  border-color: var(--line);
  color: var(--text-muted);
}

.button-stub {
  position: relative;
  overflow: visible;
}

.button-stub::after {
  content: "черновик";
  position: absolute;
  top: -0.45rem;
  right: 0.35rem;
  padding: 0 0.3rem;
  border: 1px solid rgba(255, 149, 80, 0.35);
  border-radius: 999px;
  background: rgba(10, 14, 22, 0.95);
  color: #ffd0ad;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  pointer-events: none;
}

html[lang="en"] .button-stub::after {
  content: "draft";
}

.section {
  margin-bottom: 28px;
}

.section-heading {
  display: grid;
  gap: 6px;
  margin-bottom: 14px;
}

.section-heading p {
  margin: 0;
  max-width: 58ch;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.stack-card {
  display: grid;
  gap: 10px;
  padding: 16px 18px;
  border-radius: var(--radius-lg);
  border-color: rgba(255, 149, 80, 0.2);
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
  background:
    radial-gradient(circle at top right, rgba(255, 149, 80, 0.08), transparent 26%),
    linear-gradient(180deg, rgba(255, 149, 80, 0.03), rgba(255, 149, 80, 0)),
    linear-gradient(180deg, rgba(10, 14, 22, 0.96), rgba(13, 18, 28, 0.98));
  color: inherit;
}

.stack-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.stack-card:nth-child(2) {
  border-color: rgba(35, 201, 180, 0.24);
  background:
    radial-gradient(circle at top right, rgba(35, 201, 180, 0.08), transparent 26%),
    linear-gradient(180deg, rgba(35, 201, 180, 0.03), rgba(35, 201, 180, 0)),
    linear-gradient(180deg, rgba(10, 14, 22, 0.96), rgba(13, 18, 28, 0.98));
}

.stack-card:nth-child(3) {
  border-color: rgba(79, 140, 255, 0.24);
  background:
    radial-gradient(circle at top right, rgba(79, 140, 255, 0.08), transparent 26%),
    linear-gradient(180deg, rgba(79, 140, 255, 0.03), rgba(79, 140, 255, 0)),
    linear-gradient(180deg, rgba(10, 14, 22, 0.96), rgba(13, 18, 28, 0.98));
}

.stack-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: "Poppins", sans-serif;
  font-weight: 700;
}

.stack-card:nth-child(2) .stack-index {
  background: var(--teal-soft);
  color: var(--teal);
}

.stack-card:nth-child(3) .stack-index {
  background: var(--blue-soft);
  color: var(--blue);
}

.stack-card p {
  margin: 0;
}

.stack-meta {
  color: var(--text-low);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.stack-cta {
  margin-top: auto;
  color: #ffd0ad;
  font-weight: 700;
  font-size: 0.92rem;
}

.page-hero {
  margin-bottom: 22px;
}

.page-hero .hero-summary {
  max-width: 60ch;
}

.stub-panel {
  padding: 22px;
  border-radius: var(--radius-xl);
  border-color: rgba(180, 124, 255, 0.18);
  background:
    radial-gradient(circle at top right, rgba(180, 124, 255, 0.08), transparent 26%),
    linear-gradient(180deg, rgba(180, 124, 255, 0.055), rgba(180, 124, 255, 0)),
    linear-gradient(180deg, rgba(10, 14, 22, 0.96), rgba(13, 18, 28, 0.98));
}

.stub-panel h2 {
  margin-bottom: 12px;
}

.stub-panel ol {
  margin: 0 0 18px;
  padding-left: 18px;
}

.stub-panel li + li {
  margin-top: 8px;
}

.wire-blocks {
  display: grid;
  gap: 10px;
  margin-bottom: 18px;
}

.wire-block {
  min-height: 48px;
  display: flex;
  align-items: center;
  padding: 12px 14px;
  border: 1px dashed rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.02);
  color: var(--text-low);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.wire-block.tall {
  min-height: 120px;
  align-items: flex-start;
}

.diagram-card {
  margin: 0 0 28px;
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  background: #f4f5f7;
  overflow: auto;
}

.diagram-card figcaption {
  margin: 0 0 12px;
  color: #3a4254;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.diagram-card img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 1044px;
  margin: 0 auto;
}

.tech-list {
  margin: 0 0 24px;
  padding-left: 18px;
  color: var(--text);
  line-height: 1.55;
}

.tech-list li + li {
  margin-top: 8px;
}

.sandbox-accounts-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.sandbox-accounts-toolbar .status {
  margin: 0;
  color: var(--text-low);
  font-size: 0.92rem;
}

.sandbox-accounts-toolbar .status[data-error="1"] {
  color: #ff8f8f;
}

.sandbox-accounts-wrap {
  overflow-x: auto;
  margin-bottom: 20px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
}

.sandbox-accounts-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.sandbox-accounts-table th,
.sandbox-accounts-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  vertical-align: middle;
}

.sandbox-accounts-table th {
  color: var(--text-low);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.sandbox-accounts-table tr.is-free td:nth-child(3) {
  color: #8dffa8;
}

.sandbox-accounts-table tr.is-busy td:nth-child(3) {
  color: #ffd28a;
}

.sandbox-accounts-table .mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85rem;
}

.sandbox-accounts-table td:last-child {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.button-small {
  min-height: 34px;
  padding: 0 12px;
  font-size: 0.85rem;
}

.stub-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.status-pill {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  min-height: 30px;
  margin-bottom: 14px;
  padding: 0 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: #ffd0ad;
  font-size: 0.82rem;
  font-weight: 700;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
  padding: 18px 20px;
  border-radius: var(--radius-lg);
}

.footer-copy {
  margin: 0;
}

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

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

.reveal-on-scroll {
  opacity: 0;
  transform: translate3d(0, 22px, 0);
  transition:
    opacity 520ms ease,
    transform 520ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

.reveal-on-scroll.is-visible {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

@media (max-width: 1100px) {
  .hero-layout {
    grid-template-columns: 1fr;
    gap: 14px;
  }

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

  .hero-proof {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.8fr);
    gap: 14px 18px;
    align-items: start;
  }

  .hero-proof .brief-label {
    grid-column: 1 / -1;
    margin-bottom: 0;
  }

  .hero-stats {
    margin-top: 0;
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .page-shell {
    padding: 12px 12px 32px;
  }

  .topbar {
    top: 8px;
    margin-bottom: 14px;
  }

  .topbar-links {
    flex: 1 1 100%;
    gap: 10px 14px;
  }

  .lang-switch {
    margin-left: 0;
  }

  .hero {
    margin-bottom: 18px;
  }

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

  .hero-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .hero-buttons,
  .footer,
  .footer-links,
  .stub-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .button {
    width: 100%;
  }

  h1 {
    max-width: none;
    font-size: clamp(1.85rem, 8vw, 2.2rem);
  }
}

@media (max-width: 480px) {
  .topbar-links {
    gap: 8px;
    font-size: 0.74rem;
    letter-spacing: 0.05em;
  }

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

  .hero-buttons {
    gap: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  .reveal-on-scroll {
    opacity: 1;
    transform: none;
  }
}