/* ============================================================================
   EuroScope Data Bridge — static site stylesheet
   Minimal tech theme: dark, mono accents, single accent color.
   ========================================================================== */

:root {
  --bg: #0a0e14;
  --bg-2: #0c121b;
  --panel: #0f1721;
  --panel-2: #0b1119;
  --border: #1c2937;
  --border-2: #25384b;
  --text: #d8e3ef;
  --muted: #8fa0b4;
  --faint: #5d6c7f;
  --accent: #45d6c0;
  --accent-strong: #63ecda;
  --accent-dim: rgba(69, 214, 192, 0.12);
  --danger: #ff7a6e;
  --code-bg: #0a111a;
  --radius: 10px;
  --mono: ui-monospace, "Cascadia Mono", "JetBrains Mono", "SFMono-Regular", Consolas, "Courier New", monospace;
  --sans: -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --nav-h: 60px;
  --content-w: 1040px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    radial-gradient(1100px 500px at 50% -160px, rgba(69, 214, 192, 0.07), transparent 65%),
    var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15.5px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

/* faint blueprint grid */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(120, 150, 180, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 150, 180, 0.035) 1px, transparent 1px);
  background-size: 44px 44px;
  z-index: -1;
}

::selection { background: rgba(69, 214, 192, 0.28); }

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-strong); }

h1, h2, h3, h4 { line-height: 1.3; color: #eaf2fa; }

code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--accent-dim);
  color: var(--accent-strong);
  padding: 0.12em 0.42em;
  border-radius: 5px;
  white-space: nowrap;
}

/* ---------------------------------------------------------------------------
   Top navigation
   ------------------------------------------------------------------------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--nav-h);
  background: rgba(10, 14, 20, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--content-w);
  height: 100%;
  margin: 0 auto;
  padding: 0 22px;
  display: flex;
  align-items: center;
  gap: 26px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--text);
  font-family: var(--mono);
  font-size: 14.5px;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.brand svg { color: var(--accent); flex: none; }
.brand em { font-style: normal; color: var(--accent); }
.brand:hover { color: #fff; }

.nav-links {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  color: var(--muted);
  font-size: 14px;
  padding: 7px 13px;
  border-radius: 7px;
  border: 1px solid transparent;
  transition: color .15s, border-color .15s, background .15s;
}
.nav-links a:hover { color: var(--text); }
.nav-links a.active {
  color: var(--accent-strong);
  background: var(--accent-dim);
  border-color: rgba(69, 214, 192, 0.28);
}

.nav-lang {
  font-family: var(--mono);
  font-size: 12.5px !important;
  letter-spacing: 0.06em;
}

.toc-toggle {
  display: none;
  margin-left: auto;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 7px;
  font-size: 15px;
  padding: 6px 11px;
  cursor: pointer;
}

/* ---------------------------------------------------------------------------
   Hero (homepage)
   ------------------------------------------------------------------------- */

.hero {
  position: relative;
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 108px 24px 64px;
  text-align: center;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 12px;
  width: 640px;
  height: 640px;
  transform: translateX(-50%);
  pointer-events: none;
  background: conic-gradient(from 0deg, rgba(69, 214, 192, 0.10), transparent 68deg, transparent 360deg);
  border-radius: 50%;
  animation: sweep 9s linear infinite;
  opacity: 0.9;
}
@keyframes sweep { to { transform: translateX(-50%) rotate(360deg); } }

.eyebrow {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 20px;
}

.hero h1 {
  font-size: clamp(38px, 6vw, 60px);
  margin: 0 0 18px;
  letter-spacing: -0.015em;
}

.hero h1 .accent { color: var(--accent); }

.hero-sub {
  max-width: 640px;
  margin: 0 auto 30px;
  color: var(--muted);
  font-size: 17px;
}

.hero-cta {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 44px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 0.03em;
  color: #04120e;
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 8px;
  padding: 11px 22px;
  transition: transform .12s, box-shadow .12s, background .12s;
}
.btn:hover { color: #02100c; background: var(--accent-strong); transform: translateY(-1px); box-shadow: 0 6px 26px rgba(69, 214, 192, 0.25); }

.btn.ghost {
  color: var(--muted);
  background: transparent;
  border-color: var(--border-2);
}
.btn.ghost:hover { color: var(--text); border-color: var(--accent); background: var(--accent-dim); box-shadow: none; }

.badges {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 46px;
}

.badge {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--muted);
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 999px;
  padding: 5px 13px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  max-width: 860px;
  margin: 0 auto;
}

.stat {
  background: var(--panel);
  padding: 18px 10px 16px;
}
.stat-v {
  display: block;
  font-family: var(--mono);
  font-size: 17px;
  color: var(--accent-strong);
  margin-bottom: 4px;
}
.stat-k {
  display: block;
  font-size: 12.5px;
  color: var(--faint);
  letter-spacing: 0.04em;
}

/* ---------------------------------------------------------------------------
   Sections (homepage)
   ------------------------------------------------------------------------- */

.sec {
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 72px 24px 0;
}

.sec-label {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--faint);
  margin: 0 0 14px;
}
.sec-label::before { content: "// "; color: var(--accent); }

.sec h2 {
  font-size: 27px;
  margin: 0 0 18px;
}

.sec > p { color: var(--muted); max-width: 780px; }

/* About key points */
.about-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-top: 26px;
}
.about-item {
  background: var(--panel);
  padding: 18px 22px;
  display: flex;
  gap: 14px;
  align-items: baseline;
}
.about-item .k {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  flex: none;
  min-width: 118px;
}
.about-item .v { color: var(--muted); font-size: 14.5px; }

/* Architecture diagram */
.diagram {
  display: flex;
  align-items: stretch;
  gap: 0;
  margin-top: 30px;
  flex-wrap: wrap;
}
.diagram-node {
  flex: 1 1 240px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
  position: relative;
}
.diagram-node h3 {
  margin: 0 0 8px;
  font-size: 16.5px;
}
.diagram-node p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}
.diagram-node code { white-space: normal; }
.diagram-link {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 0 18px;
  min-width: 150px;
}
.diagram-link .wire {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--accent);
  border: 1px dashed var(--border-2);
  border-radius: 999px;
  padding: 6px 14px;
  white-space: nowrap;
}
.diagram-link .arr {
  color: var(--faint);
  font-family: var(--mono);
  letter-spacing: 0.2em;
  font-size: 13px;
}

.mode-list { margin: 26px 0 0; display: grid; gap: 12px; }
.mode-list li::marker { color: var(--accent); font-family: var(--mono); }
.mode-list li { color: var(--muted); padding-left: 6px; }
.mode-list li strong { color: var(--text); }

/* Feature cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
  margin-top: 28px;
}
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 22px;
  transition: border-color .15s, transform .15s;
}
.card:hover { border-color: var(--border-2); transform: translateY(-2px); }
.card .idx {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--faint);
  letter-spacing: 0.14em;
  display: block;
  margin-bottom: 12px;
}
.card h3 { margin: 0 0 8px; font-size: 16.5px; }
.card p { margin: 0; color: var(--muted); font-size: 14.5px; }
.card code { white-space: normal; }

/* Tech stack table */
.table-wrap {
  margin-top: 26px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow-x: auto;
  background: var(--panel);
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
}
th, td {
  text-align: left;
  padding: 11px 16px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
thead th {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--faint);
  background: var(--panel-2);
  white-space: nowrap;
}
tbody tr:last-child th, tbody tr:last-child td { border-bottom: none; }
tbody th { font-weight: 500; color: var(--text); white-space: nowrap; }
tbody td { color: var(--muted); }
table code { white-space: normal; }

/* Steps */
.steps {
  counter-reset: step;
  display: grid;
  gap: 14px;
  margin-top: 26px;
}
.step {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
}
.step::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  border: 1px solid var(--border-2);
  border-radius: 7px;
  padding: 4px 9px;
  flex: none;
  margin-top: 2px;
}
.step p { margin: 0; color: var(--muted); font-size: 14.5px; }
.step p strong { color: var(--text); }

/* Docs entry card */
.ver-chip {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--accent-strong);
  background: var(--accent-dim);
  border: 1px solid rgba(69, 214, 192, 0.3);
  border-radius: 999px;
  padding: 2px 12px;
  vertical-align: middle;
  white-space: nowrap;
}

.docs-card {
  margin-top: 28px;
  background: linear-gradient(135deg, var(--panel), var(--panel-2));
  border: 1px solid var(--border-2);
  border-radius: var(--radius);
  padding: 30px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.docs-card h3 { margin: 0 0 8px; font-size: 19px; }
.docs-card p { margin: 0; color: var(--muted); max-width: 620px; }
.docs-card .btn { flex: none; }

/* ---------------------------------------------------------------------------
   Code blocks
   ------------------------------------------------------------------------- */

.code-block {
  margin: 22px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--code-bg);
}
.code-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  background: var(--panel-2);
  border-bottom: 1px solid var(--border);
}
.code-lang {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
}
.code-copy {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px 10px;
  cursor: pointer;
  transition: color .12s, border-color .12s;
}
.code-copy:hover { color: var(--accent-strong); border-color: var(--accent); }
.code-copy.copied { color: var(--accent); border-color: var(--accent); }

pre {
  margin: 0;
  padding: 16px 18px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13.2px;
  line-height: 1.65;
  color: #c3d2e0;
}
pre code {
  background: none;
  color: inherit;
  padding: 0;
  border-radius: 0;
  white-space: pre;
}

/* ---------------------------------------------------------------------------
   Wiki layout
   ------------------------------------------------------------------------- */

.wiki-body .main { padding-top: 40px; }

.doc {
  max-width: 860px;
  margin: 0 auto;
  padding: 10px 26px 90px;
}

.toc {
  position: fixed;
  top: calc(var(--nav-h) + 26px);
  left: max(18px, calc(50% - var(--content-w) / 2 - 238px));
  width: 216px;
  max-height: calc(100vh - var(--nav-h) - 52px);
  overflow-y: auto;
  z-index: 30;
  scrollbar-width: thin;
  scrollbar-color: var(--border-2) transparent;
}

.toc-head {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--faint);
  margin-bottom: 10px;
  padding-left: 12px;
}

.toc-nav { display: flex; flex-direction: column; }

.toc-link {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
  padding: 3.5px 12px;
  border-left: 1px solid var(--border);
  transition: color .12s, border-color .12s, background .12s;
}
.toc-link:hover { color: var(--text); border-left-color: var(--border-2); }
.toc-link.active {
  color: var(--accent-strong);
  border-left-color: var(--accent);
  background: linear-gradient(90deg, var(--accent-dim), transparent 80%);
}
.toc-l3 { padding-left: 24px; font-size: 12.6px; }
.toc-l4 { padding-left: 38px; font-size: 12.2px; color: var(--faint); }
.toc-l4:hover, .toc-l4.active { color: var(--accent-strong); }

/* ---------------------------------------------------------------------------
   Wiki prose
   ------------------------------------------------------------------------- */

.doc h1 {
  font-size: 31px;
  margin: 0 0 10px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border);
}
.doc h1 + p { color: var(--muted); }

.doc h2 {
  font-size: 22.5px;
  margin: 54px 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: calc(var(--nav-h) + 22px);
}
.doc h3 {
  font-size: 17.5px;
  margin: 38px 0 12px;
  scroll-margin-top: calc(var(--nav-h) + 22px);
}
.doc h4 {
  font-size: 15.5px;
  font-family: var(--mono);
  font-weight: 600;
  color: var(--accent-strong);
  margin: 30px 0 10px;
  scroll-margin-top: calc(var(--nav-h) + 22px);
}
.doc h3, .doc h4 { scroll-margin-top: calc(var(--nav-h) + 22px); }

.doc p { color: #b9c7d6; }
.doc p strong { color: var(--text); }

.doc ul { padding-left: 22px; }
.doc li { margin: 5px 0; color: #b9c7d6; }
.doc li::marker { color: var(--accent); }

.doc blockquote {
  margin: 18px 0;
  padding: 13px 18px;
  border-left: 3px solid var(--accent);
  background: var(--accent-dim);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--muted);
  font-size: 14.5px;
}
.doc blockquote p { margin: 0; }
.doc blockquote strong { color: var(--accent-strong); }

.doc hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 34px 0;
}

.doc a { text-decoration: underline; text-decoration-color: rgba(69, 214, 192, 0.35); text-underline-offset: 3px; }

/* ---------------------------------------------------------------------------
   Footer
   ------------------------------------------------------------------------- */

.foot {
  border-top: 1px solid var(--border);
  margin-top: 60px;
  background: var(--bg-2);
}
.foot-inner {
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 26px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.foot p { margin: 0; font-size: 13.5px; color: var(--faint); }
.foot-links { font-family: var(--mono); display: flex; gap: 10px; align-items: center; }
.foot-links a { color: var(--muted); }
.foot-links a:hover { color: var(--accent-strong); }
.foot-links span { color: var(--faint); }

/* Back to top */
.to-top {
  position: fixed;
  right: 22px;
  bottom: 24px;
  z-index: 50;
  width: 42px;
  height: 42px;
  border-radius: 9px;
  border: 1px solid var(--border-2);
  background: var(--panel);
  color: var(--accent);
  font-size: 17px;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s, transform .2s;
}
.to-top.show { opacity: 1; pointer-events: auto; }
.to-top:hover { transform: translateY(-2px); border-color: var(--accent); }

/* Language chooser (root index) */
.lang-chooser {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 26px;
  padding: 24px;
  text-align: center;
}
.lang-chooser .hero h1 { font-size: 34px; }

/* ---------------------------------------------------------------------------
   Responsive
   ------------------------------------------------------------------------- */

@media (max-width: 1280px) {
  .toc { left: 18px; }
}

@media (max-width: 1120px) {
  .toc {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    bottom: 0;
    width: auto;
    max-height: none;
    background: rgba(10, 14, 20, 0.98);
    backdrop-filter: blur(10px);
    border-right: 1px solid var(--border);
    padding: 22px 26px 40px;
    transform: translateX(-102%);
    transition: transform .22s ease;
  }
  .toc.open { transform: translateX(0); }
  .toc-toggle { display: block; }
  .toc-link { padding: 8px 12px; border-left-width: 2px; font-size: 14px; }
  .toc-l3 { padding-left: 26px; }
  .toc-l4 { padding-left: 40px; }
}

@media (max-width: 760px) {
  .hero { padding-top: 76px; }
  .hero-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .about-grid { grid-template-columns: 1fr; }
  .about-item { flex-direction: column; gap: 2px; }
  .nav-inner { gap: 12px; }
  .brand-name em { display: none; }
  .diagram-link { min-width: 100%; padding: 10px 0; flex-direction: row; }
  .sec { padding-top: 58px; }
  .doc { padding-left: 18px; padding-right: 18px; }
  .foot-inner { flex-direction: column; align-items: flex-start; }
}