:root {
  --bg: #eef3f9;
  --bg-grad-1: #e7f0ff;
  --bg-grad-2: #eef3f9;
  --surface: #ffffff;
  --surface-2: #f6f9fc;
  --text: #16202e;
  --muted: #5d6b7d;
  --primary: #0e8276;
  --primary-dark: #0a655c;
  --primary-soft: rgba(14, 130, 118, 0.12);
  --accent: #2f80ed;
  --accent-soft: rgba(47, 128, 237, 0.12);
  --danger: #c0392b;
  --danger-bg: #fdecea;
  --danger-border: #f1b0a8;
  --warn-bg: #fff7e6;
  --warn-border: #f0d58a;
  --rx-bg: #eef4ff;
  --rx-border: #c5d9f2;
  --border: #dce4ee;
  --shadow: 0 12px 34px rgba(20, 32, 46, 0.10);
  --shadow-sm: 0 4px 14px rgba(20, 32, 46, 0.06);
  --radius: 18px;
  --radius-sm: 12px;
  --skeleton-bone: #ebe6dc;
  --skeleton-joint: #d8d2c8;
  --skeleton-stroke: #a89f90;
  --skeleton-cavity: rgba(22, 32, 46, 0.12);
}

[data-theme="dark"] {
  --bg: #0e1622;
  --bg-grad-1: #111c2c;
  --bg-grad-2: #0e1622;
  --surface: #18222f;
  --surface-2: #1f2b3a;
  --text: #e7eef6;
  --muted: #9fb0c2;
  --primary: #2bb3a3;
  --primary-dark: #5fd0c2;
  --primary-soft: rgba(43, 179, 163, 0.16);
  --accent: #5b9bf3;
  --accent-soft: rgba(91, 155, 243, 0.16);
  --danger: #ff7a6b;
  --danger-bg: #3a1f1c;
  --danger-border: #6b3530;
  --warn-bg: #33291320;
  --warn-border: #5c4a1f;
  --rx-bg: #16263f;
  --rx-border: #2a456b;
  --border: #2a3848;
  --shadow: 0 12px 34px rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 4px 14px rgba(0, 0, 0, 0.3);
  --skeleton-bone: #2a3138;
  --skeleton-joint: #353d46;
  --skeleton-stroke: #5c6773;
  --skeleton-cavity: rgba(0, 0, 0, 0.25);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background:
    radial-gradient(1200px 500px at 80% -10%, var(--bg-grad-1), transparent),
    linear-gradient(180deg, var(--bg-grad-1) 0%, var(--bg-grad-2) 45%);
  background-attachment: fixed;
  color: var(--text);
  line-height: 1.55;
  min-height: 100vh;
}

.app-header,
.disclaimer,
.app-main,
.app-footer {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.1rem;
}

/* ---------- Header ---------- */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1.5rem;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.brand-logo {
  color: var(--primary);
  display: inline-flex;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
}

.tagline {
  color: var(--muted);
  font-size: 0.85rem;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font-size: 1.1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, transform 0.1s;
}

.icon-btn:hover {
  background: var(--surface-2);
}

.icon-btn:active {
  transform: scale(0.94);
}

.lang-toggle {
  display: inline-flex;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
}

.lang-btn {
  border: 0;
  background: transparent;
  padding: 0.5rem 0.9rem;
  cursor: pointer;
  font-weight: 700;
  color: var(--muted);
  font-size: 0.85rem;
}

.lang-btn.active {
  background: var(--primary);
  color: #fff;
}

/* ---------- Disclaimer ---------- */
.disclaimer {
  margin-top: 1rem;
  background: var(--warn-bg);
  border: 1px solid var(--warn-border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
}

.disclaimer-icon {
  font-size: 1.3rem;
  line-height: 1.3;
}

.disclaimer strong {
  display: block;
  margin-bottom: 0.15rem;
}

.disclaimer p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

/* ---------- Main / screens ---------- */
.app-main {
  padding: 1.5rem 1.1rem 2.5rem;
}

.screen {
  display: none;
  animation: fade 0.35s ease;
}

.screen.active {
  display: block;
}

@keyframes fade {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.screen-header {
  margin-bottom: 1.25rem;
}

.screen-header h2 {
  margin: 0.2rem 0 0.35rem;
  font-size: 1.55rem;
  letter-spacing: -0.02em;
}

.screen-header > p {
  margin: 0;
  color: var(--muted);
}

/* ---------- Card base ---------- */
.body-map-wrapper,
.region-list,
.question-card,
.result-card,
.probabilities-panel,
.alternatives,
.recommendations,
.explanation,
.context-form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

/* ---------- Body map ---------- */
.map-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 1.4rem;
  align-items: start;
}

.body-map-wrapper {
  padding: 1.25rem 1rem 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

.map-tooltip {
  position: absolute;
  z-index: 20;
  pointer-events: none;
  background: var(--text);
  color: var(--surface);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.35rem 0.65rem;
  border-radius: 8px;
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
}

.map-tooltip.hidden {
  display: none;
}

#body-map {
  width: 100%;
  max-width: 268px;
  display: block;
  margin: 0 auto;
  filter: drop-shadow(0 8px 20px rgba(20, 32, 46, 0.1));
}

.skeleton {
  pointer-events: none;
}

.skeleton-bone {
  fill: var(--skeleton-bone);
  stroke: var(--skeleton-stroke);
  stroke-width: 1.2;
  stroke-linejoin: round;
}

.skeleton-bone-line {
  fill: none;
  stroke: var(--skeleton-stroke);
  stroke-width: 3.5;
  stroke-linecap: round;
}

.skeleton-rib {
  fill: none;
  stroke: var(--skeleton-stroke);
  stroke-width: 1.4;
  stroke-linecap: round;
  opacity: 0.85;
}

.skeleton-joint {
  fill: var(--skeleton-joint);
  stroke: var(--skeleton-stroke);
  stroke-width: 1;
}

.skeleton-cavity {
  fill: var(--skeleton-cavity);
  stroke: none;
}

.skeleton-detail {
  fill: none;
  stroke: var(--skeleton-stroke);
  stroke-width: 1;
  stroke-linecap: round;
  opacity: 0.55;
}

.skeleton-disc {
  stroke: var(--skeleton-stroke);
  stroke-width: 0.8;
  opacity: 0.45;
}

.body-stroke {
  fill: var(--surface-2);
  stroke: var(--border);
  stroke-width: 2;
  stroke-linejoin: round;
}

.body-zone {
  fill: var(--primary-soft);
  fill-opacity: 0.42;
  stroke: var(--primary);
  stroke-opacity: 0.55;
  stroke-width: 16;
  paint-order: stroke fill;
  cursor: pointer;
  transition: fill 0.18s, fill-opacity 0.18s, stroke 0.18s, transform 0.12s;
  transform-box: fill-box;
  transform-origin: center;
}

.body-zone:hover,
.body-zone:focus {
  fill: var(--accent-soft);
  fill-opacity: 0.55;
  outline: none;
  transform: scale(1.04);
  stroke: var(--accent);
  stroke-opacity: 0.65;
  stroke-width: 2;
}

.body-zone.selected {
  fill: var(--primary);
  fill-opacity: 0.5;
  stroke: var(--primary);
  stroke-opacity: 0.75;
  stroke-width: 2;
}

.body-zone-joint {
  fill: var(--accent-soft);
  fill-opacity: 0.48;
  stroke: var(--accent);
  stroke-opacity: 0.55;
  stroke-width: 14;
}

.body-zone-extremity {
  stroke-width: 20;
}

.body-zone-joint:hover,
.body-zone-joint:focus {
  fill: var(--accent);
  fill-opacity: 0.45;
  stroke: var(--accent);
  stroke-opacity: 0.5;
  stroke-width: 2;
}

/* ---------- Map extra zones (back / skin / general) ---------- */
.map-extra {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1.1rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--border);
  width: 100%;
}

.map-extra-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: border-color 0.2s, transform 0.1s;
}

.map-extra-btn:hover {
  border-color: var(--accent);
}

.map-extra-btn:active {
  transform: scale(0.96);
}

.dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  display: inline-block;
}

.dot-back {
  background: #8794a5;
}

.dot-skin {
  background: #9b59b6;
}

.dot-general {
  background: #e08a38;
}

/* ---------- Region list ---------- */
.region-list {
  padding: 1rem 1.1rem;
}

.region-list > h3 {
  margin: 0.2rem 0 0.8rem;
  font-size: 1rem;
}

.region-group + .region-group {
  margin-top: 1rem;
}

.region-group-title {
  margin: 0 0 0.5rem;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.region-buttons {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
}

.region-btn {
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.8rem;
  text-align: left;
  cursor: pointer;
  font-size: 0.9rem;
  font-family: inherit;
  transition: border-color 0.2s, background 0.2s, transform 0.1s;
}

.region-btn:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.region-btn:active {
  transform: scale(0.98);
}

/* ---------- Context form ---------- */
.context-form {
  padding: 1.25rem;
  display: grid;
  gap: 1.25rem;
  max-width: 640px;
}

.context-field label {
  display: block;
  font-weight: 700;
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

.segmented {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  background: var(--surface-2);
  padding: 0.3rem;
  border-radius: 999px;
  border: 1px solid var(--border);
}

.segmented button {
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 0.5rem 1rem;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.88rem;
  font-family: inherit;
  transition: background 0.2s, color 0.2s;
}

.segmented button.active {
  background: var(--primary);
  color: #fff;
}

.context-actions {
  margin-top: 1.25rem;
}

/* ---------- Buttons ---------- */
.btn {
  border: 0;
  border-radius: var(--radius-sm);
  padding: 0.8rem 1.2rem;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.95rem;
  font-family: inherit;
  transition: transform 0.1s, filter 0.2s, background 0.2s;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-secondary {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--accent);
}

.btn-text {
  background: none;
  border: 0;
  color: var(--accent);
  cursor: pointer;
  padding: 0;
  font-weight: 600;
  font-family: inherit;
  font-size: 0.9rem;
}

.btn-text:hover {
  text-decoration: underline;
}

/* ---------- Question screen ---------- */
.context-summary {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.6rem 0;
}

.chip {
  background: var(--primary-soft);
  color: var(--primary-dark);
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
  font-size: 0.78rem;
  font-weight: 600;
}

.progress-wrap {
  margin-top: 0.8rem;
}

.progress-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.progress-caption {
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.progress-bar {
  height: 10px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 999px;
  transition: width 0.4s ease;
}

.progress-text {
  display: inline-block;
  margin-top: 0.3rem;
  font-weight: 800;
  color: var(--primary-dark);
  font-size: 0.85rem;
}

.question-card {
  padding: 1.6rem 1.4rem;
  margin-bottom: 1rem;
}

.question-text {
  margin: 0 0 1.4rem;
  font-size: 1.4rem;
  letter-spacing: -0.01em;
}

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

.btn-yes,
.btn-no,
.btn-unknown {
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.95rem;
  transition: transform 0.1s, filter 0.2s;
}

.btn-yes:active,
.btn-no:active,
.btn-unknown:active {
  transform: scale(0.97);
}

.btn-yes {
  background: var(--primary-soft);
  color: var(--primary-dark);
  border-color: var(--primary);
}

.btn-no {
  background: var(--danger-bg);
  color: var(--danger);
  border-color: var(--danger-border);
}

.btn-unknown {
  background: var(--surface-2);
  color: var(--muted);
  border-color: var(--border);
}

.btn-undo {
  display: inline-block;
  margin-top: 1rem;
  color: var(--muted);
}

/* ---------- Probabilities ---------- */
.probabilities-panel,
.alternatives,
.recommendations,
.explanation {
  padding: 1.2rem 1.3rem;
}

.probabilities-panel h3,
.alternatives h3,
.recommendations h3,
.explanation h3 {
  margin: 0 0 0.8rem;
  font-size: 1.05rem;
}

.prob-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.prob-list li {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.5rem;
  align-items: center;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
}

.prob-list li:last-child {
  border-bottom: 0;
}

.prob-bar-wrap {
  grid-column: 1 / -1;
  height: 7px;
  background: var(--surface-2);
  border-radius: 999px;
  overflow: hidden;
}

.prob-bar {
  height: 100%;
  background: var(--accent);
  border-radius: 999px;
  transition: width 0.4s ease;
}

.prob-value {
  font-weight: 800;
  color: var(--primary-dark);
  font-size: 0.9rem;
}

/* ---------- Result ---------- */
.result-card {
  padding: 1.4rem;
  margin-bottom: 1rem;
  border-left: 5px solid var(--primary);
}

.confidence-label {
  margin: 0;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.75rem;
  font-weight: 700;
}

.result-disease-name {
  margin: 0.3rem 0;
  font-size: 1.85rem;
  letter-spacing: -0.02em;
  color: var(--primary-dark);
}

.result-confidence {
  margin: 0 0 0.6rem;
  font-weight: 700;
}

.explanation {
  margin-bottom: 1rem;
}

.explanation-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.45rem;
}

.explanation-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.8rem;
  font-size: 0.92rem;
}

.explanation-check {
  color: var(--primary);
  font-weight: 800;
}

.explanation-empty {
  color: var(--muted);
  font-style: italic;
}

.alternatives {
  margin-bottom: 1rem;
}

/* ---------- Recommendations ---------- */
.reco-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.reco-block {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1rem;
}

.reco-block h4 {
  margin: 0 0 0.5rem;
  font-size: 0.95rem;
}

.reco-block ul {
  margin: 0;
  padding-left: 1.1rem;
}

.reco-block li + li {
  margin-top: 0.35rem;
}

.reco-block-rx {
  background: var(--rx-bg);
  border-color: var(--rx-border);
}

.reco-note {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  color: var(--muted);
  font-style: italic;
}

.reco-block-alert {
  background: var(--danger-bg);
  border-color: var(--danger-border);
}

/* ---------- Banners ---------- */
.red-flag-banner,
.emergency-result {
  background: var(--danger-bg);
  border: 1px solid var(--danger-border);
  color: var(--danger);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  margin-bottom: 1rem;
  font-weight: 700;
}

.low-confidence-result {
  background: var(--warn-bg);
  border: 1px solid var(--warn-border);
  color: var(--text);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  margin-bottom: 1rem;
  font-size: 0.92rem;
}

.hidden {
  display: none !important;
}

[hidden] {
  display: none !important;
}

.result-actions {
  margin-top: 1.3rem;
  display: flex;
  gap: 0.7rem;
  flex-wrap: wrap;
}

/* ---------- Footer ---------- */
.app-footer {
  padding-bottom: 2rem;
  color: var(--muted);
  font-size: 0.82rem;
  text-align: center;
}

/* ---------- SEO / AIO crawlable content ---------- */
.seo-about {
  max-width: 1080px;
  margin: 0 auto 1.5rem;
  padding: 0 1.1rem;
}

.seo-about details {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  box-shadow: var(--shadow-sm);
}

.seo-about summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--text);
}

.seo-about-body {
  margin-top: 0.75rem;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.seo-about-body p + p {
  margin-top: 0.75rem;
}

.seo-keywords {
  font-size: 0.82rem;
  opacity: 0.9;
}

html[lang="fr"] .seo-en {
  display: none;
}

html[lang="en"] .seo-fr {
  display: none;
}

/* ---------- Responsive ---------- */
@media (max-width: 880px) {
  .map-layout,
  .reco-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .app-header {
    flex-wrap: wrap;
  }

  .answer-buttons {
    grid-template-columns: 1fr;
  }

  .region-buttons {
    grid-template-columns: 1fr;
  }

  .question-text {
    font-size: 1.2rem;
  }
}