/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #6C63FF;
  --primary-dark: #5A52D5;
  --primary-light: #E8E6FF;
  --success: #2ECC71;
  --danger: #E74C3C;
  --warning: #F39C12;
  --bg: #F5F6FA;
  --surface: #FFFFFF;
  --text: #2C3E50;
  --text-secondary: #7F8C8D;
  --border: #E0E3E8;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.12);
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

html { font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100dvh;
  overflow-x: hidden;
}

#app { min-height: 100dvh; position: relative; }

/* ── Views ── */
.view { display: none; min-height: 100dvh; flex-direction: column; }
.view.active { display: flex; }

/* ── Header ── */
.app-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: calc(12px + var(--safe-top)) 16px 12px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.app-header h1 {
  flex: 1;
  font-size: 1.1rem;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.header-actions { display: flex; gap: 4px; }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  -webkit-tap-highlight-color: transparent;
}
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-outline { background: transparent; border: 1.5px solid var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { opacity: 0.9; }
.btn-block { width: 100%; }
.btn-sm { padding: 6px 14px; font-size: 0.85rem; }
.btn-icon {
  background: none;
  border: none;
  padding: 8px;
  cursor: pointer;
  color: var(--text-secondary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  -webkit-tap-highlight-color: transparent;
}
.btn-icon:hover { background: var(--primary-light); color: var(--primary); }
.btn-icon.active { color: var(--warning); }

/* ── Login ── */
.login-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
  padding: 24px;
}
.login-logo { text-align: center; margin-bottom: 40px; }
.logo-icon {
  width: 80px;
  height: 80px;
  border-radius: 20px;
  background: var(--primary);
  color: #fff;
  font-size: 2.5rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  box-shadow: var(--shadow-lg);
}
.login-logo h1 { font-size: 1.8rem; color: var(--text); }
.login-subtitle { color: var(--text-secondary); margin-top: 4px; }
.login-form { width: 100%; max-width: 360px; }
.login-form label { display: block; margin-bottom: 6px; font-weight: 600; font-size: 0.9rem; }
.login-form input {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  margin-bottom: 16px;
  outline: none;
  transition: border-color 0.15s;
}
.login-form input:focus { border-color: var(--primary); }
.auth-switch { text-align: center; font-size: 0.9rem; color: var(--text-secondary); margin-top: 8px; }
.auth-switch a { color: var(--primary); text-decoration: none; font-weight: 600; }
.link-telegram-section { margin-bottom: 16px; }
.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  cursor: pointer;
  margin-bottom: 8px;
}
.checkbox-label input[type="checkbox"] {
  width: auto;
  margin: 0;
  accent-color: var(--primary);
}
.input-hint { font-size: 0.78rem; color: var(--text-secondary); margin-top: -10px; margin-bottom: 12px; }
#reg-chatid-wrapper label { margin-top: 8px; }

/* ── Menu ── */
.menu-stats {
  padding: 16px;
  display: flex;
  gap: 12px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.stat-card {
  flex: 0 0 auto;
  min-width: 100px;
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  text-align: center;
  box-shadow: var(--shadow);
}
.stat-value { font-size: 1.4rem; font-weight: 800; color: var(--primary); }
.stat-label { font-size: 0.75rem; color: var(--text-secondary); margin-top: 2px; }
.menu-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  padding: 0 16px 24px;
}
.menu-card {
  background: var(--surface);
  border: none;
  border-radius: var(--radius);
  padding: 20px 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: all 0.15s;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  -webkit-tap-highlight-color: transparent;
}
.menu-card:active { transform: scale(0.96); box-shadow: var(--shadow-lg); }
.menu-icon { font-size: 1.8rem; }

/* ── Test list ── */
.test-list { flex: 1; overflow-y: auto; padding: 8px 16px; }
.test-item {
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  margin-bottom: 8px;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  transition: all 0.15s;
  -webkit-tap-highlight-color: transparent;
}
.test-item:active { transform: scale(0.98); }
.test-item-info { flex: 1; min-width: 0; }
.test-item-title {
  font-weight: 600;
  font-size: 0.95rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.test-item-meta { font-size: 0.8rem; color: var(--text-secondary); margin-top: 2px; }
.test-item-actions { display: flex; gap: 2px; flex-shrink: 0; }
.test-badge {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 600;
  display: inline-block;
  margin-right: 4px;
}
.test-badge.done { background: #E8F5E9; color: #2E7D32; }
.test-badge.attempts { background: #E3F2FD; color: #1565C0; }

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 12px 16px calc(12px + var(--safe-bottom));
}
.pagination button {
  padding: 8px 16px;
  border: 1.5px solid var(--border);
  background: var(--surface);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.85rem;
}
.pagination button.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.pagination button:disabled { opacity: 0.4; cursor: not-allowed; }

.panel-mega-test {
  display: flex;
  gap: 8px;
  padding: 10px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.mega-seleccion-resumen {
  width: 100%;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* ── Upload ── */
.upload-area { padding: 16px; }
.upload-dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.15s;
  color: var(--text-secondary);
  margin-bottom: 16px;
}
.upload-dropzone.dragover { border-color: var(--primary); background: var(--primary-light); }
.upload-dropzone svg { margin-bottom: 12px; color: var(--primary); }
.upload-hint { font-size: 0.8rem; margin-top: 4px; }
.upload-status { margin-top: 12px; }
.upload-status .success { color: var(--success); font-weight: 600; }
.upload-status .error { color: var(--danger); font-weight: 600; }

/* ── Quiz ── */
.quiz-progress-bar {
  height: 4px;
  background: var(--border);
}
.quiz-progress-fill {
  height: 100%;
  background: var(--primary);
  transition: width 0.3s;
  width: 0%;
}
.quiz-body {
  flex: 1;
  padding: 16px;
  display: flex;
  flex-direction: column;
}
.quiz-counter {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 600;
  white-space: nowrap;
}
.question-text {
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.6;
  margin-bottom: 20px;
  white-space: pre-wrap;
}
.options-list { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.option-btn {
  width: 100%;
  text-align: left;
  padding: 14px 16px;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.15s;
  line-height: 1.4;
  -webkit-tap-highlight-color: transparent;
}
.option-btn:active { transform: scale(0.98); }
.option-btn.correct { border-color: var(--success); background: #E8F5E9; color: #2E7D32; }
.option-btn.wrong { border-color: var(--danger); background: #FFEBEE; color: #C62828; }
.option-btn.reveal-correct { border-color: var(--success); background: #E8F5E9; }
.option-btn.disabled { pointer-events: none; }

.question-explanation {
  background: #FFF3E0;
  border-left: 3px solid var(--warning);
  padding: 12px 16px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 16px;
  font-size: 0.9rem;
  line-height: 1.5;
  white-space: pre-wrap;
}
.hidden { display: none !important; }

.question-actions {
  display: flex;
  gap: 12px;
  margin-top: auto;
  padding-bottom: calc(8px + var(--safe-bottom));
}
.question-actions .btn { flex: 1; }
.question-actions #btn-fav-question { flex: 0 0 auto; }
.question-actions #btn-fav-question.is-fav { color: var(--warning); border-color: var(--warning); }
.question-actions #btn-fav-question.is-fav svg { fill: var(--warning); }

/* ── Results ── */
.results-body {
  padding: 16px;
  flex: 1;
}
.results-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  text-align: center;
  margin-bottom: 16px;
}
.results-score {
  font-size: 3rem;
  font-weight: 800;
  margin: 8px 0;
}
.results-score.pass { color: var(--success); }
.results-score.fail { color: var(--danger); }
.results-detail {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-top: 16px;
}
.results-detail-item { text-align: center; }
.results-detail-value { font-size: 1.3rem; font-weight: 700; }
.results-detail-label { font-size: 0.8rem; color: var(--text-secondary); }
.results-correct { color: var(--success); }
.results-wrong { color: var(--danger); }
.results-blank { color: var(--text-secondary); }

/* ── Progress ── */
.progress-body { padding: 16px; flex: 1; overflow-y: auto; }
.progress-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  margin-bottom: 12px;
}
.progress-card h3 { font-size: 0.95rem; margin-bottom: 8px; }
.progress-bar-container {
  height: 8px;
  background: var(--border);
  border-radius: 4px;
  overflow: hidden;
  margin: 8px 0;
}
.progress-bar-fill {
  height: 100%;
  border-radius: 4px;
  transition: width 0.3s;
}
.progress-bar-fill.good { background: var(--success); }
.progress-bar-fill.medium { background: var(--warning); }
.progress-bar-fill.bad { background: var(--danger); }
.progress-attempts {
  font-size: 0.8rem;
  color: var(--text-secondary);
}
.progress-attempt-row {
  display: flex;
  justify-content: space-between;
  padding: 4px 0;
  font-size: 0.85rem;
  border-bottom: 1px solid var(--border);
}
.progress-attempt-row:last-child { border-bottom: none; }

/* ── Simulacro results ── */
.sim-section {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  margin-bottom: 12px;
}
.sim-section h3 { font-size: 0.95rem; margin-bottom: 12px; color: var(--primary); }
.sim-row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border);
}
.sim-row:last-child { border-bottom: none; }
.sim-row .label { color: var(--text-secondary); }
.sim-row .value { font-weight: 600; }
.sim-row .value.pass { color: var(--success); }
.sim-row .value.fail { color: var(--danger); }

/* ── Toast ── */
.toast {
  position: fixed;
  bottom: calc(24px + var(--safe-bottom));
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: #fff;
  padding: 10px 24px;
  border-radius: 24px;
  font-size: 0.9rem;
  font-weight: 500;
  z-index: 999;
  transition: opacity 0.3s;
  box-shadow: var(--shadow-lg);
}
.toast.hidden { opacity: 0; pointer-events: none; }

/* ── Confirm dialog ── */
.dialog-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 24px;
}
.dialog {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px;
  max-width: 340px;
  width: 100%;
  box-shadow: var(--shadow-lg);
}
.dialog h3 { margin-bottom: 8px; }
.dialog p { color: var(--text-secondary); margin-bottom: 20px; font-size: 0.9rem; }
.dialog-actions { display: flex; gap: 8px; justify-content: flex-end; }
.dialog-editor-pregunta {
  max-width: 620px;
  width: 100%;
  max-height: 85dvh;
  overflow-y: auto;
}
.dialog-editor-pregunta label {
  display: block;
  margin: 8px 0 4px;
  font-weight: 600;
  font-size: 0.85rem;
}
.dialog-editor-pregunta textarea {
  width: 100%;
  min-height: 68px;
  resize: vertical;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: 0.92rem;
  font-family: inherit;
}
.dialog-editor-pregunta textarea:focus {
  outline: none;
  border-color: var(--primary);
}
.mega-checkbox {
  width: 20px;
  height: 20px;
  accent-color: var(--primary);
}

/* ── Loading spinner ── */
.spinner {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
}
.spinner::after {
  content: '';
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Empty state ── */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-secondary);
}
.empty-state svg { margin-bottom: 12px; opacity: 0.4; }
.empty-state p { font-size: 0.95rem; }

/* ── Desktop tweaks ── */
@media (min-width: 600px) {
  .menu-grid { grid-template-columns: repeat(4, 1fr); max-width: 640px; margin: 0 auto; }
  .test-list { max-width: 640px; margin: 0 auto; }
  .quiz-body { max-width: 640px; margin: 0 auto; width: 100%; }
  .results-body { max-width: 640px; margin: 0 auto; }
  .progress-body { max-width: 640px; margin: 0 auto; }
  .upload-area { max-width: 480px; margin: 0 auto; }
  .login-container { max-width: 400px; margin: 0 auto; }
  .menu-stats { justify-content: center; max-width: 640px; margin: 0 auto; }
}