:root {
  --bg: #0f1115;
  --card: #171a21;
  --card-border: #262b35;
  --text: #eef0f4;
  --text-dim: #9aa2b1;
  --accent: #5b8cff;
  --accent-dim: #2c3f73;
  --good: #34c77b;
  --improve: #f5a524;
  --danger: #ef5350;
  --radius: 16px;
}

* { box-sizing: border-box; }

/* Sin esto, elementos como <main> (que ponemos en display:flex) ignoran el
   atributo "hidden" que le ponemos por JS, porque nuestra propia regla de
   display gana por especificidad al estilo por defecto del navegador. */
[hidden] {
  display: none !important;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: radial-gradient(circle at top, #1a1e27, var(--bg) 60%);
  color: var(--text);
  min-height: 100vh;
}

.app {
  max-width: 560px;
  margin: 0 auto;
  padding: 32px 20px 60px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.app-header {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo-mark {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
}

.app-header h1 {
  margin: 0;
  font-size: 20px;
}

.tagline {
  margin: 2px 0 0;
  font-size: 13px;
  color: var(--text-dim);
}

main {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.challenge-card, .transcript-card, .feedback-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 20px;
}

.challenge-label, .transcript-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.challenge-text {
  font-size: 17px;
  line-height: 1.5;
  margin: 0 0 12px;
}

.link-btn {
  background: none;
  border: none;
  color: var(--accent);
  font-size: 13px;
  cursor: pointer;
  padding: 0;
}

.record-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
}

.mic-btn {
  width: 84px;
  height: 84px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, var(--accent), #8a5bff);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  box-shadow: 0 0 0 0 rgba(91, 140, 255, 0.5);
}

.mic-btn:hover { transform: scale(1.04); }

.mic-btn.recording {
  background: linear-gradient(135deg, var(--danger), #ff8a65);
  animation: pulse 1.4s infinite;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(239, 83, 80, 0.5); }
  70% { box-shadow: 0 0 0 18px rgba(239, 83, 80, 0); }
  100% { box-shadow: 0 0 0 0 rgba(239, 83, 80, 0); }
}

.mic-status {
  font-size: 13px;
  color: var(--text-dim);
  text-align: center;
  margin: 0;
}

.transcript-text {
  font-size: 15px;
  line-height: 1.6;
  margin: 0 0 16px;
  color: var(--text);
}

.transcript-actions {
  display: flex;
  gap: 10px;
}

.primary-btn {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 10px;
  padding: 12px 18px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  flex: 1;
}

.primary-btn:hover { filter: brightness(1.08); }
.primary-btn:disabled { opacity: 0.6; cursor: not-allowed; }

.ghost-btn {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  padding: 12px 18px;
  font-size: 14px;
  cursor: pointer;
}

.feedback-loading {
  font-size: 14px;
  color: var(--text-dim);
  text-align: center;
  padding: 12px 0;
}

.feedback-content { display: flex; flex-direction: column; gap: 16px; }

.feedback-block h3 {
  margin: 0 0 8px;
  font-size: 14px;
}

.feedback-block.good h3 { color: var(--good); }
.feedback-block.improve h3 { color: var(--improve); }

.feedback-block ul {
  margin: 0;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text);
}

.feedback-block ul li { margin-bottom: 6px; }

.feedback-score {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 4px;
}

.feedback-score .score-num {
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
}

.feedback-score .score-label {
  font-size: 12px;
  color: var(--text-dim);
}

.error-card {
  background: rgba(239, 83, 80, 0.1);
  border: 1px solid rgba(239, 83, 80, 0.4);
  color: #ffb4b1;
  border-radius: var(--radius);
  padding: 16px;
  font-size: 14px;
}

.app-footer {
  text-align: center;
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 8px;
}

/* ===================== Header con usuario ===================== */
.app-header {
  flex-wrap: wrap;
}

.header-text {
  flex: 1;
  min-width: 220px;
}

.user-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.access-label {
  font-size: 12px;
  color: var(--text-dim);
  margin: -6px 0 12px;
}

.access-label.warning {
  color: var(--improve);
  font-weight: 600;
}

.user-email-label {
  font-size: 12px;
  color: var(--text-dim);
  margin: 0;
  text-align: center;
}

.points-badge {
  background: var(--accent-dim);
  color: var(--accent);
  font-weight: 700;
  font-size: 13px;
  padding: 6px 12px;
  border-radius: 999px;
  white-space: nowrap;
}

.ghost-btn.small {
  padding: 8px 12px;
  font-size: 13px;
  text-decoration: none;
  display: inline-block;
}

/* ===================== Login ===================== */
.section-title {
  margin: 0 0 16px;
  font-size: 17px;
}

.oauth-buttons {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 18px;
}

.oauth-btn {
  background: #1f2430;
  border: 1px solid var(--card-border);
  color: var(--text);
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

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

.divider {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-dim);
  font-size: 12px;
  margin: 16px 0;
}

.divider::before,
.divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--card-border);
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.auth-form input {
  background: #1f2430;
  border: 1px solid var(--card-border);
  color: var(--text);
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 14px;
}

.auth-form input:focus {
  outline: none;
  border-color: var(--accent);
}

.auth-form-actions {
  display: flex;
  gap: 10px;
  margin-top: 4px;
}

.auth-message {
  margin: 12px 0 0;
  font-size: 13px;
}

/* ===================== Selectores Release/Sprint/Lección ===================== */
.challenge-hint {
  font-size: 13px;
  color: var(--text-dim);
  margin: 0 0 14px;
}

.selector-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.selector-row label {
  flex: 1;
  min-width: 90px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 12px;
  color: var(--text-dim);
}

.selector-row select {
  background: #1f2430;
  border: 1px solid var(--card-border);
  color: var(--text);
  border-radius: 10px;
  padding: 10px;
  font-size: 14px;
}

/* ===================== Admin ===================== */
.admin-app main {
  gap: 20px;
}

.table-wrap {
  overflow-x: auto;
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.admin-table th,
.admin-table td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--card-border);
  white-space: nowrap;
}

.admin-table th {
  color: var(--text-dim);
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ===================== Nivel conversacional (Talk) ===================== */
.level-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: 0;
}

.level-select {
  background: #1f2430;
  border: 1px solid var(--card-border);
  color: var(--text);
  border-radius: 10px;
  padding: 6px 10px;
  font-size: 13px;
}

/* ===================== Banner motivacional ===================== */
.motivation-banner {
  background: linear-gradient(135deg, rgba(91, 140, 255, 0.15), rgba(138, 91, 255, 0.15));
  border: 1px solid var(--accent-dim);
  border-radius: var(--radius);
  padding: 14px 18px;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--text);
}

/* ===================== Admin: navegación tipo SPA ===================== */
.admin-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 4px;
}

.admin-tab-btn {
  background: #1f2430;
  border: 1px solid var(--card-border);
  color: var(--text-dim);
  border-radius: 999px;
  padding: 9px 16px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

.admin-tab-btn.active {
  background: var(--accent-dim);
  color: var(--accent);
  border-color: var(--accent-dim);
}

.admin-panel {
  display: none;
}

.admin-panel.active {
  display: block;
}

.stat-summary {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.stat-pill {
  background: #1f2430;
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 10px 16px;
  font-size: 13px;
  color: var(--text-dim);
}

.stat-pill strong {
  display: block;
  font-size: 20px;
  color: var(--text);
  font-weight: 700;
}

/* ===================== Estado de carga inicial (verificando sesión) ===================== */
.loading-card {
  text-align: center;
  color: var(--text-dim);
  font-size: 14px;
}

/* ===================== Talk: conversación en vivo ===================== */
.level-badge {
  background: #1f2430;
  color: var(--text-dim);
  font-weight: 600;
  font-size: 12px;
  padding: 6px 12px;
  border-radius: 999px;
  white-space: nowrap;
  border: 1px solid var(--card-border);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-dim);
  margin: 0;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-dim);
  flex-shrink: 0;
}

.status-pill.listening .status-dot {
  background: var(--danger);
  animation: pulse-dot 1.2s infinite;
}
.status-pill.thinking .status-dot {
  background: var(--improve);
  animation: pulse-dot 1.2s infinite;
}
.status-pill.speaking .status-dot {
  background: var(--accent);
  animation: pulse-dot 1.2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.chat-log {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 360px;
  overflow-y: auto;
  padding: 4px 2px;
  margin-bottom: 4px;
}

.chat-bubble {
  max-width: 82%;
  padding: 10px 14px;
  border-radius: 14px;
  font-size: 14px;
  line-height: 1.5;
}

.chat-bubble.ai {
  align-self: flex-start;
  background: #1f2430;
  border: 1px solid var(--card-border);
  color: var(--text);
  border-bottom-left-radius: 4px;
}

.chat-bubble.user {
  align-self: flex-end;
  background: var(--accent-dim);
  color: var(--text);
  border-bottom-right-radius: 4px;
}

.chat-bubble.interim {
  opacity: 0.6;
  font-style: italic;
}

.talk-controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 8px 0 4px;
}

.end-session-row {
  display: flex;
  justify-content: center;
  margin-top: 4px;
}

.calibration-banner {
  background: linear-gradient(135deg, rgba(91, 140, 255, 0.15), rgba(138, 91, 255, 0.15));
  border: 1px solid var(--accent-dim);
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--text);
}

.summary-points {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 4px;
}

/* ===================== Login por código (OTP) ===================== */
.auth-note {
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.5;
  margin: 12px 0 0;
}

.auth-form input.code-input {
  font-size: 24px;
  letter-spacing: 0.35em;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.link-btn:disabled {
  opacity: 0.5;
  cursor: default;
}

/* ===== Avatar del compañero de práctica ===== */
.avatar-card { display: flex; justify-content: center; margin-bottom: 16px; }
.avatar-wrap { display: flex; align-items: center; gap: 16px; max-width: 640px; width: 100%; }
.avatar { width: 150px; height: 150px; flex: 0 0 150px; filter: drop-shadow(0 6px 16px rgba(11, 31, 75, .18)); }
.avatar-bubble {
  position: relative; background: var(--card); border: 1px solid var(--card-border); border-radius: 16px;
  padding: 12px 16px; font-size: 15px; line-height: 1.5; color: var(--text); flex: 1 1 auto; min-height: 48px;
}
.avatar-bubble::before {
  content: ""; position: absolute; left: -9px; top: 50%; transform: translateY(-50%) rotate(45deg);
  width: 16px; height: 16px; background: var(--card); border-left: 1px solid var(--card-border); border-bottom: 1px solid var(--card-border);
}
.av-mouth-open { opacity: 0; }
.talking .av-mouth-open { animation: av-talk .28s infinite alternate; }
.talking .av-mouth-closed { opacity: 0; }
@keyframes av-talk { from { opacity: .25; transform: scaleY(.5); transform-origin: 100px 116px; } to { opacity: 1; transform: scaleY(1); transform-origin: 100px 116px; } }
.av-eyes { animation: av-blink 5s infinite; transform-origin: 100px 84px; }
@keyframes av-blink { 0%, 92%, 100% { transform: scaleY(1); } 95% { transform: scaleY(.08); } }
.talking .avatar { animation: av-bob 1.1s ease-in-out infinite; }
@keyframes av-bob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-3px); } }
@media (max-width: 520px) {
  .avatar-wrap { flex-direction: column; text-align: center; }
  .avatar-bubble::before { left: 50%; top: -9px; transform: translateX(-50%) rotate(135deg); }
}

/* ===== Preparación: selectores, temas, vocabulario, niveles ===== */
.sub-title { font-size: 16px; margin: 18px 0 8px; }
.select-row { display: flex; gap: 12px; flex-wrap: wrap; }
.select-row label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--text-dim); flex: 1 1 160px; }
.select-row select {
  padding: 10px 12px; border-radius: 10px; border: 1px solid var(--card-border); background: rgba(255,255,255,.06);
  color: var(--text); font-size: 14px; font-family: inherit;
}
/* La lista desplegable la pinta el sistema con fondo blanco: letras en azul eléctrico para que se lean. */
.select-row select option { color: #1a5eff; background: #ffffff; font-weight: 600; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  background: rgba(255,255,255,.06); border: 1px solid var(--card-border); border-radius: 999px; padding: 8px 14px;
  font-size: 14px; color: var(--text); cursor: pointer; text-align: left; font-family: inherit; line-height: 1.3;
}
.chip.on { background: var(--accent); border-color: var(--accent); color: #fff; }
.kit { margin-top: 12px; border: 1px solid var(--card-border); border-radius: 12px; padding: 10px 14px; }
.kit summary { cursor: pointer; font-size: 14px; color: var(--text-dim); }
.kit-body { margin-top: 10px; display: flex; flex-direction: column; gap: 10px; }
.kit-group strong { display: block; font-size: 13px; margin-bottom: 6px; }
.kit-words { display: flex; flex-wrap: wrap; gap: 6px; }
.kit-words span { background: var(--accent-dim); color: var(--accent); border-radius: 8px; padding: 4px 9px; font-size: 13px; }
.setting-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-top: 14px; }
.setting-label { font-size: 14px; color: var(--text); }
.setting-hint { display: block; font-size: 12px; color: var(--text-dim); }
.levels { display: inline-flex; border: 1px solid var(--card-border); border-radius: 999px; overflow: hidden; }
.lvl { background: transparent; border: 0; padding: 9px 15px; font-size: 14px; font-weight: 700; color: var(--text-dim); cursor: pointer; font-family: inherit; }
.lvl + .lvl { border-left: 1px solid var(--card-border); }
.lvl.on { background: var(--accent); color: #fff; }
#startRow { margin-top: 18px; }

/* Dos avatares: Alexander (Alex) y Susan (Susie) */
.av-susie { display: none; }
.avatar-wrap[data-avatar="susie"] .av-susie { display: block; }
.avatar-wrap[data-avatar="susie"] .av-alex { display: none; }
.avatar-wrap[data-avatar="susie"] .av-mouth-closed:not(.av-susie) { display: none; }
/* Susie: piel morena, pelo y cejas castaño oscuro */
.avatar-wrap[data-avatar="susie"] .av-skin { fill: #b9794f; }
.avatar-wrap[data-avatar="susie"] .av-skin-shade { fill: #a5683f; }
.avatar-wrap[data-avatar="susie"] .av-brow { stroke: #3d2314; }
.avatar-wrap[data-avatar="susie"] .av-nose { stroke: #8f5533; }
.avatar-pick { display: flex; justify-content: center; gap: 10px; margin: -6px 0 16px; }
.avatar-opt { background: var(--card); border: 1px solid var(--card-border); border-radius: 999px; padding: 8px 16px; color: var(--text-dim); font-size: 14px; cursor: pointer; font-family: inherit; }
.avatar-opt span { color: var(--text); font-weight: 600; }
.avatar-opt.on { border-color: var(--accent); background: var(--accent-dim); color: var(--text); }

/* Ayudas durante la charla */
.help-row { margin-top: 10px; }
.hint-box, .word-box { margin-top: 10px; background: #1f2430; border: 1px solid var(--card-border); border-radius: 12px; padding: 10px 12px; font-size: 14px; width: 100%; max-width: 520px; text-align: left; }
.hint-opt { display: flex; gap: 10px; align-items: center; padding: 6px 0; }
.hint-en { font-weight: 600; }
.hint-es { color: var(--text-dim); font-size: 13px; }
.hint-foot, .word-note { color: var(--text-dim); font-size: 13px; margin-top: 6px; }
.chat-bubble.ai .w { cursor: pointer; border-bottom: 1px dotted rgba(255,255,255,.25); }
.chat-bubble.ai .w:hover { color: var(--accent); }
.slow-btn { background: transparent; border: 0; cursor: pointer; font-size: 15px; margin-left: 6px; opacity: .7; }
.slow-btn:hover { opacity: 1; }
.correction-card { align-self: flex-start; max-width: 82%; background: #2b2410; border: 1px solid #6b5a1e; border-radius: 14px; padding: 10px 14px; font-size: 14px; }
.correction-title { color: var(--improve); font-weight: 700; margin-bottom: 4px; }
.correction-better { font-size: 17px; font-weight: 700; color: #fff; }
.correction-orig { color: var(--text-dim); font-size: 13px; margin-top: 4px; }
.correction-actions { display: flex; align-items: center; gap: 10px; margin-top: 8px; flex-wrap: wrap; }
.correction-hint { color: var(--text-dim); font-size: 13px; }
.rephrase-list { list-style: none; padding: 0; margin: 0; }
.rephrase-list li { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; padding: 6px 0; border-bottom: 1px solid var(--card-border); }
.rephrase-list .said { color: var(--text-dim); text-decoration: line-through; }
.rephrase-list .better { font-weight: 600; }

/* Aviso amable con botón Reintentar (fallos temporales de la IA o de red) */
.error-card.soft { background: rgba(247, 222, 19, 0.08); border-color: rgba(247, 222, 19, 0.35); color: #F5E7A1; }
.retry-btn { margin-left: 6px; background: #1A5EFF; color: #fff; border: 0; border-radius: 999px; padding: 6px 14px; font-weight: 700; font-size: .9rem; cursor: pointer; font-family: inherit; }
.retry-btn:hover { filter: brightness(1.08); }

/* Aceptación de términos y tratamiento de datos */
.auth-form .consent { display: flex; gap: 10px; align-items: flex-start; font-size: 13px; line-height: 1.45; color: var(--text); cursor: pointer; text-align: left; }
.auth-form .consent input { width: 18px; height: 18px; padding: 0; margin: 1px 0 0; flex: 0 0 auto; border-radius: 4px; accent-color: var(--accent); }
.auth-form .consent a { color: inherit; font-weight: 600; text-decoration: underline; }