:root {
  --color-bg: #F2F1EB;
  --color-surface: #FFFFFF;
  --color-ink: #161D1B;
  --color-ink-soft: #3D4744;
  --color-teal: #1F5F5B;
  --color-teal-dark: #143F3C;
  --color-teal-tint: #E4EFEE;
  --color-amber: #B8681F;
  --color-amber-tint: #F6E9DA;
  --color-grey: #6B7280;
  --color-line: #D8D5C9;

  --font-head: Charter, 'Iowan Old Style', 'Palatino Linotype', Georgia, Cambria, serif;
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, 'Liberation Mono', monospace;

  --radius: 3px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
}

a { color: var(--color-teal-dark); }
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--color-teal);
  outline-offset: 2px;
}

h1, h2, h3 {
  font-family: var(--font-head);
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 0.5em 0;
  color: var(--color-ink);
}

h1 { font-size: 2.6rem; font-weight: 700; }
h2 { font-size: 1.6rem; }
h3 { font-size: 1.15rem; }

p { max-width: 68ch; }

.layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: 100vh;
}

.sidebar {
  background: var(--color-teal-dark);
  color: #EAF3F1;
  padding: 2rem 1.5rem;
}

.sidebar .brand {
  font-family: var(--font-head);
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  text-decoration: none;
  display: block;
  margin-bottom: 2.5rem;
  line-height: 1.3;
}

.sidebar nav {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.sidebar nav a {
  color: #C9DEDA;
  text-decoration: none;
  padding: 0.5rem 0.6rem;
  border-radius: var(--radius);
  font-size: 0.94rem;
}

.sidebar nav a:hover,
.sidebar nav a.active {
  background: rgba(255,255,255,0.08);
  color: #fff;
}

.sidebar .nav-group-label {
  font-size: 0.78rem;
  color: #7FA39D;
  margin: 1.4rem 0 0.3rem 0.6rem;
}

main {
  padding: 3rem 4rem;
  max-width: 980px;
}

.hero {
  border-bottom: 1px solid var(--color-line);
  padding-bottom: 2.5rem;
  margin-bottom: 2.5rem;
}

.hero .kicker {
  color: var(--color-teal-dark);
  font-weight: 500;
  margin-bottom: 0.8rem;
}

.hero p.lede {
  font-size: 1.15rem;
  color: var(--color-ink-soft);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius);
}

.badge-standard {
  background: var(--color-teal-tint);
  color: var(--color-teal-dark);
}

.badge-offlabel {
  background: var(--color-amber-tint);
  color: var(--color-amber);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.2rem;
  margin: 2rem 0;
}

.protocol-card {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 1.4rem;
}

.protocol-card h3 {
  margin-bottom: 0.5rem;
}

.protocol-card .device-tag {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-grey);
  display: block;
  margin-top: 0.6rem;
}

.protocol-card a.card-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

section.block {
  margin: 2.6rem 0;
}

.disclaimer {
  border-left: 3px solid var(--color-amber);
  background: var(--color-amber-tint);
  padding: 1rem 1.2rem;
  font-size: 0.92rem;
  color: #6B4110;
  border-radius: 0 var(--radius) var(--radius) 0;
}

table.protocol-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.94rem;
}

table.protocol-table th, table.protocol-table td {
  text-align: left;
  padding: 0.55rem 0.7rem;
  border-bottom: 1px solid var(--color-line);
}

table.protocol-table th {
  font-weight: 600;
  color: var(--color-ink-soft);
  font-size: 0.82rem;
}

.calc-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 2rem;
  margin-top: 1.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.calc-field {
  margin-bottom: 1.1rem;
}

.calc-field label {
  display: block;
  font-size: 0.86rem;
  color: var(--color-ink-soft);
  margin-bottom: 0.3rem;
}

.calc-field input, .calc-field select {
  width: 100%;
  padding: 0.55rem 0.6rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 0.95rem;
  background: var(--color-bg);
}

.calc-result {
  background: var(--color-teal-tint);
  border-radius: var(--radius);
  padding: 1.4rem;
}

.calc-result .value {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  color: var(--color-teal-dark);
  display: block;
  margin: 0.2rem 0 0.9rem 0;
}

.calc-result .value-label {
  font-size: 0.82rem;
  color: var(--color-ink-soft);
  text-transform: none;
}

footer.page-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-line);
  font-size: 0.82rem;
  color: var(--color-grey);
}

.info-box {
  border-left: 3px solid var(--color-teal);
  background: var(--color-teal-tint);
  padding: 1rem 1.2rem;
  font-size: 0.92rem;
  color: var(--color-teal-dark);
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.2rem 0;
}

.info-box strong.label {
  display: block;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.3rem;
  color: var(--color-teal-dark);
}

.lang-switch {
  margin-top: 1.6rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255,255,255,0.12);
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.lang-switch a {
  color: #9DBFB9;
  text-decoration: none;
  font-size: 0.82rem;
  padding: 0.2rem 0.4rem;
  border-radius: var(--radius);
}

.lang-switch a.active {
  color: #fff;
  background: rgba(255,255,255,0.1);
}

.lang-switch a:hover {
  color: #fff;
}

@media (max-width: 800px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  main { padding: 2rem 1.3rem; }
  .card-grid, .calc-panel { grid-template-columns: 1fr; }
}