/* ============================================================
   Tutor Cangur — estils de la web vainilla.
   Port fidel del CSS de app.py: mateixos colors, bombolles de xat,
   targetes i comportaments de hover. Els selectors específics de
   Streamlit s'han traduït a classes netes.
   ============================================================ */

@import url("https://fonts.googleapis.com/css2?family=Bricolage+Grotesque:opsz,wght@12..96,500;12..96,700;12..96,800&family=Figtree:ital,wght@0,400;0,500;0,600;0,700;1,400&display=swap");

:root {
  /* Paleta (idèntica a app.py) */
  --user-bg: #dbeafe;
  --user-fg: #1e3a5f;
  --ai-bg: #f1f5f9;
  --ai-fg: #1f2937;
  --hint-bg: #fef9c3;
  --hint-border: #eab308;
  --hint-fg: #713f12;
  --system-fg: #6b7280;

  --warning-border: #ef4444;
  --warning-bg: #fef2f2;
  --info-border: #3b82f6;
  --info-bg: #eff6ff;
  --ok-border: #22c55e;
  --ok-bg: #f0fdf4;
  --fail-border: #f97316;
  --fail-bg: #fff7ed;

  --card-bg: #fafafa;
  --card-border: #e5e7eb;
  --chip-border: #d1d5db;

  --hint-btn: #fef08a;
  --hint-btn-hover: #eab308;
  --commit-enter-btn: #bbf7d0;
  --commit-enter-btn-hover: #4ade80;
  --blue-soft: #dbeafe;
  --blue-strong: #60a5fa;
  --blue-accent: #2563eb;
  --gray-soft: #e5e7eb;
  --gray-strong: #9ca3af;

  --commit-section-bg: #fef3c7;
  --commit-section-border: #fbbf24;

  --ink: #1a1a1a;
  --muted: #6b7280;
  --page-bg: #f7f8fa;

  --font-display: "Bricolage Grotesque", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "Figtree", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-body);
  font-size: 1.02rem;
  line-height: 1.5;
  color: var(--ink);
  background: var(--page-bg);
  -webkit-font-smoothing: antialiased;
}

.app {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0.9rem 1rem 4rem;
}

/* Quan la IA està desactivada, una sola columna més estreta i centrada
   (equival al max-width:70% de app.py en mode AI-off). */
body.ai-off .app {
  max-width: 820px;
}

/* ---- Títols ---- */
.app-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0.2rem 0 0.8rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.problem-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  margin: 0.2rem 0 0.6rem;
  color: #111827;
}

.dialeg-title {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin: 0 0 0.5rem;
}

hr.turn-separator {
  border: none;
  border-top: 1px solid #e5e7eb;
  margin: 1.2rem 0 0.4rem;
}

/* ---- Banner de benvinguda (st.info) ---- */
.welcome {
  background: var(--info-bg);
  border-left: 4px solid var(--info-border);
  border-radius: 8px;
  padding: 0.9rem 1.1rem;
  margin: 0.4rem 0 1rem;
  color: #1e3a5f;
}
.welcome strong {
  font-weight: 700;
}

/* ============================================================
   Selector de problema (expander "Escull un problema")
   ============================================================ */
.selector {
  background: #fff;
  border: 1px solid var(--card-border);
  border-radius: 12px;
  margin: 0 0 1.2rem;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}
.selector > summary {
  cursor: pointer;
  list-style: none;
  padding: 0.8rem 1.1rem;
  font-weight: 700;
  font-family: var(--font-display);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  user-select: none;
}
.selector > summary::-webkit-details-marker {
  display: none;
}
.selector > summary::after {
  content: "▸";
  margin-left: auto;
  color: var(--muted);
  transition: transform 0.2s;
}
.selector[open] > summary::after {
  transform: rotate(90deg);
}
.selector-body {
  padding: 0.4rem 1.1rem 1.1rem;
  border-top: 1px solid var(--card-border);
}

.filter-row {
  margin: 0.8rem 0;
}
.filter-row .filter-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 0.35rem;
}
.pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.pill {
  font-family: var(--font-body);
  font-size: 0.95rem;
  padding: 0.32rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--chip-border);
  background: #fff;
  color: #374151;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s, color 0.12s;
}
.pill:hover {
  border-color: #9ca3af;
}
.pill.selected {
  background: var(--blue-accent);
  border-color: var(--blue-accent);
  color: #fff;
  font-weight: 600;
}

.field-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin: 0.9rem 0 0.35rem;
}
select.problem-select {
  width: 100%;
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--chip-border);
  border-radius: 8px;
  background: #fff;
  color: #111827;
}
.selector-empty {
  color: var(--muted);
  font-style: italic;
  padding: 0.5rem 0;
}

/* ---- Botons base ---- */
button {
  font-family: var(--font-body);
}
.btn {
  font-size: 1rem;
  font-weight: 600;
  padding: 0.6rem 1rem;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s, border-width 0.15s,
    color 0.15s;
}
.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}
.btn-full {
  width: 100%;
}

/* Inicia el problema */
.btn-start {
  background: var(--blue-accent);
  color: #fff;
  border-color: var(--blue-accent);
  margin-top: 0.9rem;
}
.btn-start:hover {
  background: #1d4ed8;
}

/* ============================================================
   Layout del problema
   ============================================================ */
.layout {
  display: grid;
  gap: 1.4rem;
  align-items: start;
}
body.ai-on .layout {
  grid-template-columns: 7fr 3fr;
}
body.ai-off .layout {
  grid-template-columns: 1fr;
}

.problem-panel {
  padding: 0.25rem 0.25rem 0.5rem;
}
body.ai-on .problem-panel {
  position: sticky;
  top: 0.5rem;
}

/* Imatge de l'enunciat: respecta proporcions, centrada, mai retallada. */
.header-image {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  margin: 0.4rem 0 0.2rem;
  background: #fff;
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 0.6rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}
.header-image img {
  max-width: 100%;
  max-height: 60vh;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
}
body.ai-on .header-image img {
  max-height: 45vh;
}

/* Targeta d'opcions A-E (el text real és a la imatge) */
.opcions-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 6px;
  padding: 0.55rem 0.9rem;
  margin: 0.7rem 0 1.4rem;
  font-size: 0.95rem;
}
.opcions-card .label-row {
  display: inline-block;
  margin-right: 0.7rem;
  padding: 0.15rem 0.6rem;
  background: #fff;
  border: 1px solid var(--chip-border);
  border-radius: 4px;
  font-weight: 600;
  cursor: not-allowed;
}
.opcions-card .label-row.eliminated {
  color: #9ca3af;
  text-decoration: line-through;
  background: #f3f4f6;
}

/* Fila de botons d'acció (pista / ja tinc la resposta) */
.action-row {
  display: flex;
  gap: 0.8rem;
  margin: 0.4rem 0 0.6rem;
}
.action-row .btn {
  flex: 1;
}

.btn-hint {
  background: var(--hint-btn);
  border-color: var(--hint-btn);
  color: var(--ink);
}
.btn-hint:hover:not(:disabled) {
  background: var(--hint-btn-hover);
  border: 2px solid #000;
  color: #000;
}
.btn-commit-enter {
  background: var(--commit-enter-btn);
  border-color: var(--commit-enter-btn);
  color: var(--ink);
}
.btn-commit-enter:hover:not(:disabled) {
  background: var(--commit-enter-btn-hover);
  border: 2px solid #000;
  color: #000;
}

/* ---- Mode commit ---- */
.commit-section {
  background: var(--commit-section-bg);
  border: 2px solid var(--commit-section-border);
  border-radius: 8px;
  padding: 1rem 1.2rem;
  margin: 1rem 0;
}
.commit-section .commit-prompt {
  font-weight: 700;
  margin-bottom: 0.7rem;
}
.commit-letters {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.8rem;
}
.btn-letter {
  background: var(--blue-soft);
  border-color: var(--blue-soft);
  color: var(--ink);
  font-weight: 700;
  min-width: 3rem;
  font-size: 1.05rem;
}
.btn-letter:hover:not(:disabled) {
  background: var(--blue-strong);
  border: 2px solid #000;
  color: #000;
}
.btn-cancel {
  background: var(--gray-soft);
  border-color: var(--gray-soft);
  color: var(--ink);
}
.btn-cancel:hover:not(:disabled) {
  background: var(--gray-strong);
  border: 2px solid #000;
  color: #000;
}

/* Inicia el problema següent */
.btn-next {
  border: 3px solid var(--blue-accent);
  background: #fff;
  font-weight: 700;
  color: var(--ink);
  margin-top: 0.4rem;
}
.btn-next:hover {
  background: var(--blue-soft);
  border: 3px solid #000;
}

/* ============================================================
   Fil de xat (panell dret, només amb IA activa)
   ============================================================ */
.dialogue-panel {
  min-width: 0;
}
.chat-thread {
  display: flex;
  flex-direction: column;
}
.chat-empty {
  text-align: center;
  color: #9ca3af;
  font-style: italic;
  margin: 1rem 0;
  padding: 1.5rem;
  border: 1px dashed #e5e7eb;
  border-radius: 8px;
}
.chat-user {
  background: var(--user-bg);
  border-radius: 14px 14px 4px 14px;
  padding: 0.6rem 0.9rem;
  margin: 0.4rem 0 0.4rem 15%;
  max-width: 85%;
  align-self: flex-end;
  color: var(--user-fg);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}
.chat-ai {
  background: var(--ai-bg);
  border-radius: 14px 14px 14px 4px;
  padding: 0.6rem 0.9rem;
  margin: 0.4rem 15% 0.4rem 0;
  max-width: 85%;
  align-self: flex-start;
  color: var(--ai-fg);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}
.chat-hint {
  background: var(--hint-bg);
  border-left: 4px solid var(--hint-border);
  border-radius: 8px 8px 8px 4px;
  padding: 0.6rem 0.9rem;
  margin: 0.4rem 15% 0.4rem 0;
  max-width: 85%;
  align-self: flex-start;
  color: var(--hint-fg);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}
.chat-system {
  text-align: center;
  color: var(--system-fg);
  font-size: 0.85rem;
  font-style: italic;
  margin: 0.5rem 25%;
  padding: 0.2rem;
  border-top: 1px dashed #e5e7eb;
  border-bottom: 1px dashed #e5e7eb;
}

/* Camp de missatge */
.message-form {
  margin-top: 0.8rem;
}
.message-form textarea {
  width: 100%;
  min-height: 110px;
  resize: vertical;
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 0.6rem 0.7rem;
  border-radius: 8px;
  background: var(--blue-soft);
  border: 1px solid #1f2937;
  color: #1f2937;
}
.message-form textarea::placeholder {
  font-style: italic;
  color: var(--muted);
  opacity: 1;
}
.btn-send {
  background: var(--blue-soft);
  border-color: var(--blue-soft);
  color: var(--ink);
  margin-top: 0.5rem;
}
.btn-send:hover:not(:disabled) {
  background: var(--blue-strong);
  border: 2px solid #000;
  color: #000;
}
.msg-hint-msgcount {
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 0.4rem;
  text-align: right;
}

/* ============================================================
   Missatges flash
   ============================================================ */
.flash {
  border-radius: 4px;
  margin: 0.4rem 0;
}
.msg-warning {
  border-left: 4px solid var(--warning-border);
  padding: 0.45rem 0.85rem;
  background: var(--warning-bg);
}
.msg-info {
  border-left: 4px solid var(--info-border);
  padding: 0.45rem 0.85rem;
  background: var(--info-bg);
}
.msg-commit_ok {
  border-left: 4px solid var(--ok-border);
  padding: 0.6rem 0.9rem;
  background: var(--ok-bg);
  font-size: 1.1rem;
  margin: 0.6rem 0;
}
.msg-commit_fail {
  border-left: 4px solid var(--fail-border);
  padding: 0.5rem 0.9rem;
  background: var(--fail-bg);
}

/* ============================================================
   Rastre / debug (expanders)
   ============================================================ */
.divider {
  border: none;
  border-top: 1px solid #e5e7eb;
  margin: 1.4rem 0 0.8rem;
}
details.trace {
  background: #fff;
  border: 1px solid var(--card-border);
  border-radius: 10px;
  margin: 0.6rem 0;
  overflow: hidden;
}
details.trace > summary {
  cursor: pointer;
  padding: 0.7rem 1rem;
  font-weight: 600;
  list-style: none;
}
details.trace > summary::-webkit-details-marker {
  display: none;
}
details.trace > summary::before {
  content: "▸ ";
  color: var(--muted);
}
details.trace[open] > summary::before {
  content: "▾ ";
}
.trace-body {
  padding: 0.4rem 1rem 1rem;
  border-top: 1px solid var(--card-border);
}
pre.trace-json {
  background: #0f172a;
  color: #e2e8f0;
  padding: 0.9rem;
  border-radius: 8px;
  overflow: auto;
  max-height: 420px;
  font-size: 0.82rem;
  line-height: 1.45;
}
.btn-download {
  background: var(--gray-soft);
  border-color: var(--gray-soft);
  color: var(--ink);
  margin-top: 0.6rem;
  display: inline-block;
  text-decoration: none;
}
.btn-download:hover {
  background: var(--gray-strong);
  border: 2px solid #000;
  color: #000;
}

.event-row {
  padding: 0.5rem 0;
  border-bottom: 1px solid #f1f5f9;
  font-size: 0.92rem;
}
.event-row .ev-meta {
  color: var(--muted);
  font-size: 0.8rem;
}

/* Responsive: en pantalles estretes, sempre una columna. */
@media (max-width: 880px) {
  body.ai-on .layout {
    grid-template-columns: 1fr;
  }
  body.ai-on .problem-panel {
    position: static;
  }
  .chat-system {
    margin: 0.5rem 10%;
  }
}

/* ============================================================
   Sessió: barra de progrés + panell final "Prova finalitzada"
   (afegit per al codi de verificació; veure js/codi.js)
   ============================================================ */

/* ---- Barra de sessió (a dalt, mentre es practica) ---- */
.session-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem 1rem;
  background: #fff;
  border: 1px solid var(--card-border);
  border-left: 4px solid var(--blue-accent);
  border-radius: 12px;
  padding: 0.7rem 1rem;
  margin: 0 0 1rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}
.session-bar .sb-info {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  margin-right: 0.4rem;
}
.session-bar .sb-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  color: #111827;
}
.session-bar .sb-ctx {
  font-size: 0.8rem;
  color: var(--muted);
}
.session-bar .sb-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
}
.sb-chip {
  font-size: 0.85rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  color: #374151;
  white-space: nowrap;
}
.sb-chip strong {
  font-weight: 700;
  color: #111827;
}
.sb-chip.sb-ok {
  background: var(--ok-bg);
  border-color: #bbf7d0;
}
.sb-chip.sb-ok strong {
  color: #15803d;
}
.sb-chip.sb-err {
  background: var(--fail-bg);
  border-color: #fed7aa;
}
.sb-chip.sb-err strong {
  color: #c2410c;
}
.sb-chip.sb-time {
  font-variant-numeric: tabular-nums;
}
.btn-finish {
  margin-left: auto;
  background: var(--commit-enter-btn);
  border-color: var(--commit-enter-btn);
  color: var(--ink);
  font-weight: 700;
  white-space: nowrap;
}
.btn-finish:hover:not(:disabled) {
  background: var(--commit-enter-btn-hover);
  border: 2px solid #000;
  color: #000;
}

/* ---- Panell final "Prova finalitzada" ---- */
.finished-panel {
  text-align: center;
  max-width: 760px;
  margin: 1.2rem auto 0;
}
.finished-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.7rem;
  letter-spacing: -0.01em;
  margin: 0.4rem 0 0.6rem;
  color: #111827;
}
.finished-sub {
  font-size: 1.05rem;
  color: #374151;
  margin: 0 0 1.3rem;
}
.finished-sub strong {
  color: #111827;
}

/* Tira de mètriques de la sessió */
.finished-stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem;
  margin: 0 0 1.6rem;
}
.fs-item {
  min-width: 92px;
  background: #fff;
  border: 1px solid var(--card-border);
  border-radius: 10px;
  padding: 0.7rem 0.9rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}
.fs-num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.35rem;
  line-height: 1.1;
  color: #111827;
}
.fs-num.fs-ok {
  color: #16a34a;
}
.fs-num.fs-err {
  color: #ea580c;
}
.fs-lbl {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-top: 0.2rem;
}

/* Caixa del codi (dashed, com a la referència) */
.code-box {
  background: #eef2f7;
  border: 2px dashed var(--blue-strong);
  border-radius: 14px;
  padding: 1.3rem 1.2rem;
  margin: 0 auto 1.4rem;
}
.code-box-label {
  margin: 0 0 0.9rem;
  color: #374151;
  font-size: 1rem;
}
.code-btn {
  display: inline-block;
  max-width: 100%;
  background: #0f172a;
  color: #f8fafc;
  border: 2px solid #0f172a;
  border-radius: 10px;
  padding: 0.85rem 1.2rem;
  font-family: "Courier New", ui-monospace, monospace;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 1px;
  cursor: pointer;
  word-break: break-all;
  transition: background-color 0.15s, border-color 0.15s, transform 0.05s;
}
.code-btn:hover {
  background: #1e293b;
  border-color: #1e293b;
}
.code-btn:active {
  transform: translateY(1px);
}
.code-btn.copied {
  background: #16a34a;
  border-color: #16a34a;
}
.copied-msg {
  display: none;
  color: #16a34a;
  font-weight: 700;
  font-size: 1.05rem;
  margin-top: 0.9rem;
}
.copied-msg.show {
  display: block;
}

/* Accions finals */
.finished-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.7rem;
}
.btn-continue {
  background: var(--blue-soft);
  border-color: var(--blue-soft);
  color: var(--ink);
  font-weight: 600;
}
.btn-continue:hover {
  background: var(--blue-strong);
  border: 2px solid #000;
  color: #000;
}
.btn-newsession {
  background: var(--gray-soft);
  border-color: var(--gray-soft);
  color: var(--ink);
  font-weight: 600;
}
.btn-newsession:hover {
  background: var(--gray-strong);
  border: 2px solid #000;
  color: #000;
}

@media (max-width: 880px) {
  .session-bar .btn-finish {
    margin-left: 0;
    width: 100%;
  }
}