:root {
  --bg: #fafaf7;
  --text: #1f2937;
  --muted: #6b7280;
  --accent: #0f766e;
  --line: #e5e7eb;
  --card: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111827;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --accent: #2dd4bf;
    --line: #374151;
    --card: #1f2937;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.65;
  font-size: 1.0625rem;
}
main, .site-header, .site-footer {
  max-width: 44rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}
.site-header { padding-top: 1.5rem; padding-bottom: 0.5rem; display: flex; justify-content: space-between; align-items: baseline; }
.lang-select {
  font: inherit;
  font-size: 0.9rem;
  color: var(--text);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.3rem 0.7rem;
  cursor: pointer;
  max-width: 45vw;
}
.lang-select:hover, .lang-select:focus { border-color: var(--accent); color: var(--accent); outline: none; }
.brand {
  font-weight: 800;
  font-size: 1.35rem;
  text-decoration: none;
  color: var(--text);
  letter-spacing: -0.02em;
}
.brand span { color: var(--accent); }
.hero { padding: 2.5rem 0 1rem; }
h1 { font-size: 2rem; line-height: 1.2; letter-spacing: -0.02em; margin: 0 0 0.75rem; }
h2 { font-size: 1.35rem; margin: 2.25rem 0 0.5rem; letter-spacing: -0.01em; }
p { margin: 0.6rem 0; }
a { color: var(--accent); }
.tool-list { padding-left: 1.1rem; }
.tool-list li { margin: 0.7rem 0; }
.site-footer {
  margin-top: 3.5rem;
  padding-top: 1.25rem;
  padding-bottom: 2.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.95rem;
}
.site-footer nav { display: flex; gap: 1.25rem; flex-wrap: wrap; }
.site-footer a { color: var(--muted); }

/* --- Calculator UI (shared by all tools) --- */
.tabs { display: flex; gap: 0.5rem; margin: 0.5rem 0 1rem; }
.tab {
  flex: 1;
  padding: 0.7rem 1rem;
  font-size: 1rem;
  font-weight: 600;
  border: 1px solid var(--line);
  border-radius: 0.6rem;
  background: var(--card);
  color: var(--muted);
  cursor: pointer;
}
.tab.is-active { border-color: var(--accent); color: var(--accent); }
.field-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem 1rem;
  margin-bottom: 1.25rem;
}
.field-grid label { display: flex; flex-direction: column; gap: 0.3rem; font-weight: 600; font-size: 0.95rem; }
.field-grid small { font-weight: 400; color: var(--muted); }
.field-grid .span2 { grid-column: 1 / -1; }
.field-grid input[type="number"] {
  font-size: 1.15rem;
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: var(--card);
  color: var(--text);
  width: 100%;
  min-height: 44px;
}
.field-grid input[type="range"] { width: 100%; accent-color: var(--accent); min-height: 44px; }
.field-grid select {
  font: inherit;
  font-size: 1.05rem;
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: var(--card);
  color: var(--text);
  width: 100%;
  min-height: 44px;
}
.result-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  padding: 1.1rem 1.25rem 1.25rem;
}
.result-big { font-size: 2.6rem; font-weight: 800; margin: 0; letter-spacing: -0.02em; }
.result-big small { font-size: 1rem; font-weight: 500; color: var(--muted); margin-left: 0.5rem; }
.gauge { position: relative; margin: 1rem 0 0.25rem; }
.gauge-track {
  height: 0.55rem;
  border-radius: 999px;
  background: linear-gradient(90deg, #b45309, #d9a441, #6aa84f, #3d85c6, #674ea7);
  opacity: 0.85;
}
.gauge-marker {
  position: absolute;
  top: -0.28rem;
  width: 1.1rem;
  height: 1.1rem;
  margin-left: -0.55rem;
  border-radius: 50%;
  background: var(--card);
  border: 3px solid var(--accent);
  transition: left 0.15s ease-out;
}
.gauge-labels { position: relative; height: 1.1rem; color: var(--muted); font-size: 0.8rem; margin-top: 0.35rem; }
.gauge-labels span { position: absolute; transform: translateX(-50%); white-space: nowrap; }
.feel { color: var(--accent); font-weight: 600; margin: 0.4rem 0 0.75rem; }
.breakdown { list-style: none; padding: 0; margin: 0.5rem 0 0; color: var(--muted); }
.breakdown li { padding: 0.25rem 0; }
.breakdown strong { color: var(--text); }
.recipe { list-style: none; padding: 0; margin: 0.25rem 0 0.5rem; }
.recipe li {
  display: flex; justify-content: space-between;
  padding: 0.45rem 0;
  border-bottom: 1px dashed var(--line);
  font-size: 1.1rem;
}
.recipe strong { font-variant-numeric: tabular-nums; }
.plan-title { font-weight: 700; margin: 0 0 0.25rem; }
.warn { color: #b45309; font-weight: 600; }
.guide h3 { font-size: 1.05rem; margin: 1.2rem 0 0.2rem; }
.seg { display: flex; gap: 0.5rem; }
.seg .tab { flex: 0 0 auto; padding: 0.45rem 1rem; }
.result-note { color: var(--muted); margin: 0.35rem 0 0; }
.table-scroll { overflow-x: auto; }
.conv-table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.conv-table th, .conv-table td { text-align: left; padding: 0.5rem 0.6rem; border-bottom: 1px solid var(--line); white-space: nowrap; }
.conv-table th { color: var(--muted); font-size: 0.9rem; }
@media (max-width: 480px) {
  .field-grid { grid-template-columns: 1fr; }
}