:root {
  --paper: #F4F2EC;
  --panel: #FFFFFF;
  --ink: #181E27;
  --slate: #5C6776;
  --teal: #1F8A75;
  --teal-deep: #0E5A4E;
  --teal-bright: #2BAF93;
  --indigo: #3A4FB0;
  --amber: #C2780F;
  --green: #2E8B4F;
  --red: #C0392B;
  --hairline: #E1DCCC;
  --hairline-strong: #CBC3AA;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 1px 2px rgba(24, 30, 39, 0.04), 0 8px 24px rgba(24, 30, 39, 0.06);
  --shadow-lift: 0 2px 4px rgba(24, 30, 39, 0.06), 0 16px 32px rgba(24, 30, 39, 0.10);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, legend {
  font-family: 'Spectral', serif;
  font-weight: 600;
  letter-spacing: -0.01em;
}

/* ---------- Header ---------- */

.site-header {
  border-bottom: 1px solid var(--hairline);
  background: linear-gradient(135deg, #FBFAF6 0%, #EEF6F3 60%, #E7F2EE 100%);
}

.header-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 2.6rem 2rem 2rem;
  position: relative;
}

.tab-mark {
  display: inline-block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #fff;
  background: linear-gradient(135deg, var(--teal-bright), var(--teal-deep));
  border: none;
  border-radius: 4px;
  padding: 0.25rem 0.6rem;
  margin-bottom: 1rem;
  box-shadow: 0 2px 6px rgba(14, 90, 78, 0.25);
}

.site-header h1 {
  font-size: 2.3rem;
  margin: 0 0 0.45rem;
  color: var(--ink);
}

.subhead {
  margin: 0;
  max-width: 48ch;
  color: var(--slate);
  font-size: 0.98rem;
}

/* ---------- Layout ---------- */

.layout {
  max-width: 1180px;
  margin: 0 auto;
  padding: 2.2rem 2rem 3rem;
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 1.6rem;
  align-items: start;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* ---------- Form ---------- */

.input-panel {
  padding: 2rem 2.2rem 2.4rem;
}

.field-block {
  border: none;
  margin: 0 0 1.9rem;
  padding: 0;
}

.field-block + .field-block {
  padding-top: 1.7rem;
  border-top: 1px solid var(--hairline);
}

.field-block legend {
  font-size: 1rem;
  margin-bottom: 0.9rem;
  padding: 0;
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  color: var(--ink);
}

.step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--teal-bright), var(--teal));
  color: #fff;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem;
  font-weight: 600;
}

.radio-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.7rem;
}

.radio-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  border: 1.5px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: 0.75rem 0.9rem 0.65rem;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}

.radio-card:hover {
  border-color: var(--teal-bright);
}

.radio-card input {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  accent-color: var(--teal);
}

.radio-card:has(input:checked) {
  border-color: var(--teal);
  background: linear-gradient(135deg, #F0FAF6, #FFFFFF);
  box-shadow: 0 0 0 3px rgba(31, 138, 117, 0.12);
}

.radio-title {
  font-weight: 600;
  font-size: 0.92rem;
  padding-right: 1.3rem;
  color: var(--ink);
}

.radio-codes {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.74rem;
  color: var(--teal-deep);
}

.checkbox-row {
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
  font-size: 0.88rem;
  color: var(--ink);
  background: #FBF3EA;
  border: 1px solid #E8D5B8;
  border-radius: var(--radius);
  padding: 0.7rem 0.9rem;
}

.checkbox-row input {
  margin-top: 0.2rem;
  accent-color: var(--amber);
}

.phi-warning {
  display: flex;
  gap: 0.55rem;
  align-items: center;
  font-size: 0.86rem;
  color: #7A2210;
  background: linear-gradient(135deg, #FDEDE6, #FCF6EC);
  border: none;
  border-left: 4px solid var(--red);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.9rem;
  margin-bottom: 0.9rem;
}

.phi-icon {
  font-size: 1.05rem;
  color: var(--red);
  flex-shrink: 0;
}

.phi-warning strong {
  color: var(--red);
}

textarea, input[type="text"], input[type="number"], select {
  width: 100%;
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  color: var(--ink);
  background: #FBFAF6;
  border: 1.5px solid var(--hairline-strong);
  border-radius: var(--radius-sm);
  padding: 0.75rem 0.9rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

textarea {
  resize: vertical;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.9rem;
  line-height: 1.7;
  min-height: 420px;
  background: #FCFBF8;
}

textarea:focus, input:focus, select:focus {
  outline: none;
  border-color: var(--teal);
  box-shadow: 0 0 0 4px rgba(31, 138, 117, 0.14);
}

.field-meta {
  display: flex;
  justify-content: space-between;
  margin-top: 0.4rem;
  font-size: 0.78rem;
  color: var(--slate);
}

.field-hint {
  color: var(--slate);
  font-size: 0.8rem;
}

.form-error {
  margin: 0.5rem 0 0;
  min-height: 1.1em;
  color: #A23B1F;
  font-size: 0.85rem;
}

.field-row {
  margin-bottom: 0.8rem;
}

.field-row label {
  display: block;
  font-size: 0.84rem;
  font-weight: 500;
  margin-bottom: 0.3rem;
  color: var(--ink);
}

.override-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0.7rem;
}

.hidden { display: none; }

.submit-btn {
  width: 100%;
  background: linear-gradient(135deg, var(--teal-bright), var(--teal-deep));
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  font-size: 1rem;
  padding: 0.9rem 1rem;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(14, 90, 78, 0.28);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.submit-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(14, 90, 78, 0.34);
}
.submit-btn:active { transform: translateY(0); }
.submit-btn:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; }

/* ---------- Result panel (signature: chart-tab) ---------- */

.result-panel {
  position: sticky;
  top: 1.4rem;
  padding: 0 0 0.4rem;
  overflow: hidden;
}

.result-placeholder {
  padding: 3rem 2rem;
  text-align: center;
  color: var(--slate);
}

.placeholder-mark {
  display: block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 1.6rem;
  color: var(--hairline-strong);
  margin-bottom: 0.8rem;
}

.result-head {
  background: linear-gradient(135deg, var(--teal-bright), var(--teal-deep));
  color: #fff;
  padding: 1.7rem 2rem 1.6rem;
  position: relative;
}

.result-head::before {
  content: "";
  position: absolute;
  top: 0;
  right: 1.6rem;
  width: 1.4rem;
  height: 0.7rem;
  background: var(--paper);
  border-radius: 0 0 6px 6px;
}

.result-label {
  display: block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #DDF4ED;
  margin-bottom: 0.5rem;
}

.code-row {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
}

.code {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 1.9rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.level {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-radius: 3px;
  padding: 0.22rem 0.55rem;
  font-weight: 600;
  background: rgba(255,255,255,0.22);
}

.level-low { background: rgba(46, 139, 79, 0.9); }
.level-moderate { background: rgba(194, 120, 15, 0.92); }
.level-high { background: rgba(192, 57, 43, 0.92); }
.level-na { background: rgba(255,255,255,0.22); }

.meter {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0.5rem;
  margin-top: 1.3rem;
  font-size: 0.74rem;
  color: #DDF4ED;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.meter div {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.meter b {
  font-family: 'IBM Plex Mono', monospace;
  text-transform: capitalize;
  font-size: 1rem;
  letter-spacing: normal;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.meter b::before {
  content: "";
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: #fff;
}

.meter b.level-low::before { background: #8FE3AE; }
.meter b.level-moderate::before { background: #FFCD80; }
.meter b.level-high::before { background: #FF9C8C; }

.review-section {
  padding: 1.2rem 2rem;
  border-top: 1px solid var(--hairline);
}

.review-section h3 {
  font-size: 0.85rem;
  margin: 0 0 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  color: var(--slate);
}

.review-section ul {
  margin: 0;
  padding-left: 1.1rem;
  font-size: 0.88rem;
}

.review-section li { margin-bottom: 0.4rem; }
.review-section li:last-child { margin-bottom: 0; }

.review-section.warning {
  background: #FBF3EA;
}

.review-section.warning h3 { color: var(--amber); }

.recommendation {
  margin: 0;
  font-size: 0.92rem;
  font-weight: 500;
}

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

.site-footer {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 2rem 3rem;
}

.disclaimer-banner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 0.5rem;
}

.disclaimer-card {
  display: flex;
  gap: 0.85rem;
  align-items: flex-start;
  border-radius: var(--radius);
  padding: 1.1rem 1.2rem;
  box-shadow: var(--shadow);
}

.disclaimer-icon {
  flex-shrink: 0;
  width: 1.8rem;
  height: 1.8rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Spectral', serif;
  font-weight: 700;
  font-size: 1rem;
  color: #fff;
}

.disclaimer-card h4 {
  margin: 0 0 0.3rem;
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.disclaimer-card p {
  margin: 0;
  font-size: 0.83rem;
  line-height: 1.5;
}

.disclaimer-info {
  background: linear-gradient(135deg, #EAF6F2, #F4FAF8);
  border: 1.5px solid #BFE3D6;
}
.disclaimer-info .disclaimer-icon { background: linear-gradient(135deg, var(--teal-bright), var(--teal-deep)); }
.disclaimer-info h4 { color: var(--teal-deep); }
.disclaimer-info p { color: #1F4A42; }

.disclaimer-alert {
  background: linear-gradient(135deg, #FDEDE6, #FDF6EC);
  border: 1.5px solid #F0C2A8;
}
.disclaimer-alert .disclaimer-icon { background: linear-gradient(135deg, #E0603F, var(--red)); }
.disclaimer-alert h4 { color: var(--red); }
.disclaimer-alert p { color: #7A2E1E; }

@media (max-width: 850px) {
  .disclaimer-banner {
    grid-template-columns: 1fr;
  }
}

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

@media (max-width: 850px) {
  .layout {
    grid-template-columns: 1fr;
  }
  .result-panel {
    position: static;
  }
  .radio-grid, .override-grid {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}