:root {
  --bg: #171717;
  --bg-raised: #141414;
  --card: #262626;
  --line: rgba(255, 255, 255, 0.1);
  --text: #f5f5f5;
  --muted: #a3a3a3;
  --accent: #38bdf8;
  --accent-deep: #0284c7;
  --focus: #7dd3fc;
  --max: 72rem;
  --measure: 68ch;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, sans-serif;
  line-height: 1.6;
}

img { max-width: 100%; height: auto; }

a { color: var(--accent); }
a:hover { color: #e0f2fe; }

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  background: #fff;
  color: #111;
  padding: 0.6rem 1rem;
  z-index: 100;
  border-radius: 0.4rem;
}

.skip-link:focus { top: 0.75rem; }

.wrap {
  width: min(var(--max), calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(23, 23, 23, 0.96);
  border-bottom: 1px solid var(--line);
}

.header-bar {
  width: min(var(--max), calc(100% - 2rem));
  margin-inline: auto;
  min-height: 4.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: #fff;
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.brand img { width: 2.5rem; height: 2.5rem; object-fit: contain; }
.brand span span { color: var(--accent); }

.desktop-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.35rem 0.9rem;
}

.desktop-nav a,
.mobile-nav a {
  color: #d4d4d4;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.92rem;
}

.desktop-nav a:hover,
.desktop-nav a[aria-current="page"],
.mobile-nav a:hover,
.mobile-nav a[aria-current="page"] { color: #fff; }

.menu-btn {
  display: none;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 0.75rem;
  border: 1px solid var(--line);
  background: transparent;
  color: #fff;
}

.menu-icon,
.menu-icon::before,
.menu-icon::after {
  display: block;
  width: 1.15rem;
  height: 2px;
  background: #fff;
  position: relative;
  margin: 0 auto;
}

.menu-icon::before,
.menu-icon::after {
  content: "";
  position: absolute;
  left: 0;
}

.menu-icon::before { top: -6px; }
.menu-icon::after { top: 6px; }

.menu-btn[aria-expanded="true"] .menu-icon { background: transparent; }
.menu-btn[aria-expanded="true"] .menu-icon::before { top: 0; transform: rotate(45deg); }
.menu-btn[aria-expanded="true"] .menu-icon::after { top: 0; transform: rotate(-45deg); }

.mobile-nav { display: none; }

.page-intro {
  padding: 2.5rem 0 0.5rem;
  background:
    radial-gradient(ellipse at top right, rgba(14, 165, 233, 0.16), transparent 50%),
    var(--bg);
}

.crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.5rem;
  list-style: none;
  margin: 0 0 1.25rem;
  padding: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.crumbs li:not(:last-child)::after {
  content: "/";
  margin-left: 0.5rem;
  color: #737373;
}

.crumbs a { color: #d4d4d4; text-decoration: none; }
.crumbs a:hover { text-decoration: underline; }

h1 {
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  line-height: 1.2;
  margin: 0 0 1rem;
  max-width: 22em;
}

.lede {
  font-size: 1.125rem;
  color: #d4d4d4;
  max-width: var(--measure);
  margin: 0 0 1.5rem;
}

.page-body { padding: 1rem 0 4rem; }

.page-body h2 {
  font-size: 1.55rem;
  line-height: 1.3;
  margin: 2.5rem 0 0.75rem;
}

.page-body h3 {
  font-size: 1.15rem;
  margin: 1.5rem 0 0.4rem;
}

.page-body p { max-width: var(--measure); }

.card-grid,
.project-grid {
  display: grid;
  gap: 1rem;
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}

.card-grid { grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); }
.project-grid { grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); }

.card,
.project-grid a,
.related li {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 1rem;
  padding: 1rem 1.1rem;
}

.card h3 { margin-top: 0; }
.card ul { margin: 0.4rem 0 0; padding-left: 1.1rem; }
.card li { margin: 0.25rem 0; }

.flow {
  list-style: none;
  margin: 1rem 0;
  padding: 0;
  max-width: 36rem;
}

.flow li {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  padding: 0.75rem 1rem;
  margin: 0;
}

.flow li + li { margin-top: 0.55rem; position: relative; }
.flow li + li::before {
  content: "";
  position: absolute;
  left: 1.4rem;
  top: -0.55rem;
  border-left: 2px solid var(--accent);
  height: 0.55rem;
}

.tech-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0;
  margin: 1rem 0;
  list-style: none;
}

.tech-list li {
  border: 1px solid rgba(56, 189, 248, 0.35);
  background: rgba(14, 165, 233, 0.08);
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  font-size: 0.92rem;
}

.facts {
  display: grid;
  gap: 0.85rem;
  margin: 1rem 0 0;
}

.facts div {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  padding: 0.9rem 1rem;
}

.facts dt { font-weight: 700; color: var(--accent); }
.facts dd { margin: 0.3rem 0 0; }

.related ul {
  list-style: none;
  padding: 0;
  margin: 0.5rem 0 0;
  display: grid;
  gap: 0.75rem;
}

.related a { font-weight: 700; text-decoration: none; }
.related a:hover { text-decoration: underline; }
.related span { display: block; color: var(--muted); font-weight: 400; margin-top: 0.2rem; }

.project-grid a {
  display: block;
  color: inherit;
  text-decoration: none;
}

.project-grid a:hover { border-color: rgba(56, 189, 248, 0.5); }
.project-grid strong { display: block; color: #fff; margin-bottom: 0.35rem; }
.project-grid span { color: var(--muted); }

.cta-row { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 1.5rem 0; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-deep);
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  border-radius: 0.75rem;
  padding: 0.75rem 1.1rem;
  border: 0;
}

.btn.secondary {
  background: transparent;
  border: 1px solid var(--line);
}

.contact-layout {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1.1fr 0.9fr;
}

.contact-form,
.nap,
.map-frame {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 1rem;
  padding: 1.1rem;
}

.contact-form { display: grid; gap: 0.85rem; }
.contact-form label { display: block; font-weight: 700; margin-bottom: 0.3rem; }

.contact-form input,
.contact-form textarea {
  width: 100%;
  border-radius: 0.7rem;
  border: 1px solid #525252;
  background: #1c1c1c;
  color: #fff;
  padding: 0.7rem 0.8rem;
  font: inherit;
}

.contact-form button {
  background: linear-gradient(90deg, #0284c7, #0ea5e9);
  color: #fff;
  font: inherit;
  font-weight: 700;
  border: 0;
  border-radius: 0.75rem;
  padding: 0.8rem 1rem;
  cursor: pointer;
}

.hp {
  position: absolute;
  left: -9999px;
  top: -9999px;
}

.nap address { font-style: normal; }
.map-frame iframe {
  width: 100%;
  height: 280px;
  border: 0;
  border-radius: 0.7rem;
}

.site-footer {
  background: var(--bg-raised);
  border-top: 1px solid var(--line);
  padding: 2.5rem 0 1.5rem;
}

.footer-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1.3fr 1fr 1fr;
}

.site-footer h2 { font-size: 1rem; margin: 0 0 0.6rem; }
.site-footer p,
.site-footer address { color: var(--muted); font-style: normal; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin: 0.35rem 0; }
.legal { color: #737373; text-align: center; margin: 1.5rem 0 0; font-size: 0.9rem; }

.note { color: var(--muted); font-size: 0.95rem; }

.toast {
  position: fixed;
  left: 50%;
  bottom: 1.25rem;
  transform: translateX(-50%);
  background: #166534;
  color: #fff;
  padding: 0.85rem 1rem;
  border-radius: 0.8rem;
  max-width: min(28rem, calc(100% - 2rem));
  z-index: 60;
}

.toast.error { background: #b91c1c; }
.toast.warn { background: #c2410c; }

@media (max-width: 900px) {
  .desktop-nav { display: none; }
  .menu-btn { display: inline-flex; align-items: center; justify-content: center; }
  .mobile-nav.is-open {
    display: block;
    max-height: 32rem;
    overflow: hidden;
    border-top: 1px solid var(--line);
  }
  .mobile-nav a {
    display: block;
    padding: 0.9rem 1rem;
    border-bottom: 1px solid var(--line);
  }
  .contact-layout,
  .footer-grid { grid-template-columns: 1fr; }
}

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