:root {
  --bg: #14171c;
  --bg-panel: #1d222b;
  --bg-panel-2: #232935;
  --border: #313a49;
  --text: #e6e9ef;
  --text-dim: #9aa3b2;
  --accent: #ff8a2a;
  --accent-strong: #ffa14d;
  --danger: #ff6b6b;
  --radius: 10px;
  --focus: 2px solid var(--accent-strong);
}

* { box-sizing: border-box; }

html { color-scheme: dark; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: #14171c;
  padding: 0.5rem 1rem;
  z-index: 10;
  border-radius: 0 0 var(--radius) 0;
}
.skip-link:focus { left: 0; }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-panel);
}

.brand { display: flex; align-items: center; gap: 0.7rem; }
.brand p { margin: 0; }
.brand-mark { font-size: 1.9rem; filter: drop-shadow(0 0 6px rgba(255, 138, 42, 0.55)); }
.brand-name {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.brand-tagline { color: var(--text-dim); font-size: 0.8rem; }

.lang-switcher { display: flex; gap: 0.35rem; }
.lang-btn {
  background: var(--bg-panel-2);
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.35rem 0.65rem;
  font-weight: 700;
  cursor: pointer;
}
.lang-btn[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: #14171c;
}

.site-nav {
  display: flex;
  gap: 0.25rem;
  overflow-x: auto;
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-panel);
}
.nav-link {
  color: var(--text-dim);
  text-decoration: none;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  white-space: nowrap;
  font-size: 0.92rem;
}
.nav-link:hover { color: var(--text); background: var(--bg-panel-2); }
.nav-link.active { color: #14171c; background: var(--accent); font-weight: 700; }

.site-main {
  flex: 1;
  width: 100%;
  max-width: 860px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}

h2 { margin: 0.5rem 0 0.4rem; font-size: 1.5rem; }
h2:focus { outline: none; }
h3 { margin: 1.4rem 0 0.4rem; font-size: 1.05rem; }
section > p { margin: 0.3rem 0 1rem; color: var(--text-dim); }

.disclaimer {
  border: 1px solid var(--accent);
  border-left-width: 5px;
  border-radius: var(--radius);
  background: rgba(255, 138, 42, 0.08);
  padding: 0.9rem 1.1rem;
  margin: 1.2rem 0;
}
.disclaimer h3 { margin: 0 0 0.3rem; color: var(--accent-strong); }
.disclaimer p { margin: 0; color: var(--text); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.9rem;
  margin: 1.4rem 0;
}
.card {
  display: block;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  color: inherit;
  text-decoration: none;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card h3 { margin: 0 0 0.35rem; color: var(--accent-strong); }
.card p { margin: 0; color: var(--text-dim); font-size: 0.9rem; }

.tool-form {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.9rem;
  align-items: end;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem;
  margin: 1rem 0;
}
.field { display: flex; flex-direction: column; gap: 0.3rem; }
.field label { font-size: 0.85rem; color: var(--text-dim); font-weight: 600; }

input, select {
  background: var(--bg-panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 0.55rem 0.7rem;
  font-size: 1rem;
  width: 100%;
}

button[type="submit"] {
  background: var(--accent);
  color: #14171c;
  border: none;
  border-radius: 8px;
  padding: 0.65rem 1.2rem;
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
  min-height: 2.7rem;
}
button[type="submit"]:hover { background: var(--accent-strong); }

:is(a, button, input, select):focus-visible { outline: var(--focus); outline-offset: 2px; }

.result:not(:empty) {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem;
  margin: 1rem 0;
}
.result-grid {
  display: grid;
  grid-template-columns: minmax(140px, auto) 1fr;
  gap: 0.45rem 1.2rem;
  margin: 0;
}
.result-grid dt { color: var(--text-dim); font-size: 0.9rem; }
.result-grid dd { margin: 0; font-weight: 700; font-variant-numeric: tabular-nums; }

.result-notes {
  margin: 0.9rem 0 0;
  padding: 0.8rem 0 0 1.2rem;
  border-top: 1px dashed var(--border);
  color: var(--text-dim);
  font-size: 0.88rem;
}
.result-notes li { margin: 0.25rem 0; }

.result-error {
  color: var(--danger);
  font-weight: 600;
  margin: 0;
}

.standards-note {
  color: var(--text-dim);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
  padding-top: 0.7rem;
  margin-top: 1.5rem;
}

.sources { color: var(--text-dim); padding-left: 1.2rem; }
.sources li { margin: 0.3rem 0; }

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-panel);
  padding: 0.8rem 1.25rem;
  color: var(--text-dim);
  font-size: 0.8rem;
  text-align: center;
}
.site-footer p { margin: 0; }

@media (prefers-reduced-motion: reduce) {
  .card { transition: none; }
  .card:hover { transform: none; }
}