:root {
  --bg: #0f172a;
  --bg-elevated: #1e293b;
  --bg-card: #1e293b;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --primary: #6366f1;
  --primary-hover: #818cf8;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --border: #334155;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 10px 30px rgba(0,0,0,0.3);
}

[data-theme="light"] {
  --bg: #f8fafc;
  --bg-elevated: #ffffff;
  --bg-card: #ffffff;
  --text: #0f172a;
  --text-muted: #475569;
  --border: #e2e8f0;
  --shadow: 0 8px 24px rgba(15,23,42,0.08);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
  padding-bottom: env(safe-area-inset-bottom);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  padding-top: calc(14px + env(safe-area-inset-top));
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
}

.topbar-title { flex: 1; }
.topbar h1 {
  font-size: 18px;
  font-weight: 700;
}
.subtitle {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
}

.btn-back, .btn-icon {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  width: 40px;
  height: 40px;
  border-radius: 10px;
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}
.btn-back:active, .btn-icon:active {
  transform: scale(0.95);
}

#app {
  padding: 20px 16px 60px;
  max-width: 720px;
  margin: 0 auto;
}

.screen {
  display: none;
  animation: fadeIn 0.25s ease;
}
.screen.active { display: block; }

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

/* HERO */
.hero {
  margin-bottom: 24px;
}
.hero h2 {
  font-size: 26px;
  font-weight: 800;
  margin-bottom: 6px;
}
.hero-sub {
  color: var(--text-muted);
  font-size: 14px;
}

/* CARDS GRID */
.cards-grid {
  display: grid;
  gap: 14px;
  margin-bottom: 24px;
}

/* SECTIONS PAR JOUR */
.day-section {
  margin-bottom: 28px;
}
.day-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
  padding: 12px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--primary);
}
.day-section.day-past .day-header {
  border-left-color: var(--success);
  opacity: 0.75;
}
.day-icon {
  font-size: 28px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: color-mix(in srgb, var(--primary) 15%, transparent);
  border-radius: 12px;
  flex-shrink: 0;
}
.day-section.day-past .day-icon {
  background: color-mix(in srgb, var(--success) 15%, transparent);
}
.day-title { flex: 1; min-width: 0; }
.day-title h3 {
  font-size: 17px;
  font-weight: 800;
  margin: 0;
}
.day-title .day-sub {
  font-size: 12px;
  color: var(--text-muted);
}
.day-cards {
  display: grid;
  gap: 14px;
}

.matiere-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 16px;
  text-align: left;
  width: 100%;
  color: var(--text);
  font-family: inherit;
  position: relative;
  overflow: hidden;
}
.matiere-card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 5px;
  background: var(--accent);
}
.matiere-card:active {
  transform: scale(0.98);
}
.matiere-card.is-locked {
  opacity: 0.72;
}
.matiere-card.is-locked::after {
  content: "Code requis";
  position: absolute;
  top: 12px;
  right: 12px;
  padding: 4px 8px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 800;
}
.matiere-card .icon {
  font-size: 38px;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  background: color-mix(in srgb, var(--accent) 15%, transparent);
  flex-shrink: 0;
}
.matiere-card .info { flex: 1; min-width: 0; }
.matiere-card .info h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 2px;
}
.matiere-card .info p {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.matiere-card .info .time {
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.matiere-card .arrow {
  color: var(--text-muted);
  font-size: 22px;
}

/* TIP */
.tip {
  background: color-mix(in srgb, var(--primary) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--primary) 30%, transparent);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--text-muted);
}

/* MATIÈRE HEADER */
.matiere-header {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.matiere-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent), transparent);
  opacity: 0.12;
}
.matiere-header > * { position: relative; }
.matiere-header .big-icon {
  font-size: 50px;
  margin-bottom: 8px;
}
.matiere-header h2 {
  font-size: 22px;
  font-weight: 800;
}
.matiere-header p {
  color: var(--text-muted);
  font-size: 14px;
  margin-top: 4px;
}

/* MODE CARDS */
.mode-cards {
  display: grid;
  gap: 12px;
  margin-bottom: 16px;
}

.mode-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  cursor: pointer;
  display: grid;
  grid-template-columns: 48px 1fr;
  grid-template-rows: auto auto;
  gap: 4px 14px;
  text-align: left;
  width: 100%;
  color: var(--text);
  font-family: inherit;
  transition: all 0.2s;
}
.mode-card:active { transform: scale(0.98); }
.mode-card .mode-icon {
  grid-row: 1 / 3;
  font-size: 32px;
  align-self: center;
}
.mode-card .mode-title {
  font-size: 16px;
  font-weight: 700;
}
.mode-card .mode-desc {
  font-size: 13px;
  color: var(--text-muted);
}

.best-score {
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 12px;
}
.best-score strong { color: var(--success); }

/* RÉSUMÉ */
.resume-content {
  display: grid;
  gap: 14px;
}
#resume-titre { margin-bottom: 16px; }
.resume-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
}
.resume-item h3 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--accent);
}
.resume-item p {
  font-size: 14px;
  color: var(--text);
  line-height: 1.55;
}
.resume-item code {
  background: var(--bg-elevated);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 12px;
  font-family: "Cascadia Code", "Fira Code", Consolas, monospace;
  color: var(--accent);
}

/* QUIZ */
.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
  font-size: 13px;
}
.quiz-progress {
  color: var(--text-muted);
  font-weight: 600;
}
.quiz-score {
  font-weight: 700;
  color: var(--success);
}

.progress-bar {
  height: 6px;
  background: var(--bg-card);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 20px;
}
.progress-fill {
  height: 100%;
  background: var(--accent, var(--primary));
  transition: width 0.3s ease;
}

.quiz-question {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  margin-bottom: 16px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
}

.quiz-options {
  display: grid;
  gap: 10px;
  margin-bottom: 16px;
}

.quiz-option {
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  text-align: left;
  cursor: pointer;
  font-size: 15px;
  color: var(--text);
  font-family: inherit;
  transition: all 0.15s;
  line-height: 1.4;
}
.quiz-option:not(:disabled):active {
  transform: scale(0.99);
}
.quiz-option:not(:disabled):hover {
  border-color: var(--accent, var(--primary));
}
.quiz-option.correct {
  background: color-mix(in srgb, var(--success) 18%, transparent);
  border-color: var(--success);
  color: var(--text);
}
.quiz-option.wrong {
  background: color-mix(in srgb, var(--danger) 18%, transparent);
  border-color: var(--danger);
}
.quiz-option:disabled {
  cursor: default;
}

.quiz-explication {
  background: color-mix(in srgb, var(--primary) 12%, transparent);
  border-left: 4px solid var(--primary);
  padding: 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  margin-bottom: 16px;
  line-height: 1.55;
}
.quiz-explication strong { color: var(--primary); }

/* BUTTONS */
.btn-primary, .btn-secondary {
  border: none;
  border-radius: var(--radius-sm);
  padding: 14px 20px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  width: 100%;
  transition: all 0.15s;
}
.btn-primary {
  background: var(--accent, var(--primary));
  color: white;
}
.btn-secondary {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-primary:active, .btn-secondary:active { transform: scale(0.98); }

/* RESULT */
.result-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  margin-bottom: 18px;
}
.result-emoji {
  font-size: 64px;
  margin-bottom: 12px;
}
.result-card h2 {
  font-size: 22px;
  margin-bottom: 6px;
}
.result-score {
  font-size: 36px;
  font-weight: 800;
  color: var(--accent, var(--primary));
  margin: 14px 0;
}
.result-message {
  color: var(--text-muted);
  font-size: 14px;
}
.result-actions {
  display: grid;
  gap: 10px;
}

/* REVIEW */
.review-content {
  display: grid;
  gap: 14px;
  margin-top: 8px;
}
.review-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
}
.review-item .q {
  font-weight: 600;
  margin-bottom: 10px;
}
.review-item .ta { color: var(--danger); font-size: 14px; margin-bottom: 4px; }
.review-item .ok { color: var(--success); font-size: 14px; margin-bottom: 8px; font-weight: 600; }
.review-item .exp {
  font-size: 13px;
  color: var(--text-muted);
  background: var(--bg-elevated);
  padding: 8px 10px;
  border-radius: 6px;
}

/* SUJETS OUVERTS */
.sujets-content {
  display: grid;
  gap: 14px;
  margin-top: 8px;
}
.sujet-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}
.sujet-item .num {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 6px;
}
.sujet-item .q {
  font-weight: 600;
  font-size: 15px;
  margin-bottom: 10px;
}
.sujet-item .reveal-btn {
  background: transparent;
  border: 1px dashed var(--border);
  color: var(--accent);
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
  font-family: inherit;
  font-weight: 600;
}
.sujet-item .reponse {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  white-space: pre-wrap;
  font-family: "Cascadia Code", "Fira Code", Consolas, monospace;
  font-size: 13px;
  line-height: 1.55;
  color: var(--text-muted);
}

/* MODALE DE BIENVENUE */
.welcome-modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(8px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeIn 0.3s ease;
}
.welcome-modal[hidden] { display: none !important; }
.welcome-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 32px 24px 24px;
  max-width: 420px;
  width: 100%;
  text-align: center;
  box-shadow: 0 30px 80px rgba(99,102,241,0.35);
  animation: popIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
  overflow: hidden;
}
.welcome-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 5px;
  background: linear-gradient(90deg, #6366f1, #06b6d4, #10b981, #ef4444);
}
@keyframes popIn {
  from { opacity: 0; transform: scale(0.85); }
  to { opacity: 1; transform: scale(1); }
}
.welcome-emoji {
  font-size: 64px;
  margin-bottom: 4px;
  display: inline-block;
  animation: bounce 2s infinite;
}
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}
.welcome-from {
  font-size: 12px;
  letter-spacing: 2px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 10px;
}
.welcome-title {
  font-size: 19px;
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 12px;
  background: linear-gradient(135deg, #6366f1, #06b6d4);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.welcome-sub {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 24px;
  line-height: 1.5;
}
.welcome-card .btn-primary {
  background: linear-gradient(135deg, #6366f1, #818cf8);
  font-size: 16px;
  padding: 14px 24px;
  box-shadow: 0 8px 24px rgba(99,102,241,0.4);
}

/* ÉPREUVES — Liste */
.epreuves-intro {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.epreuves-list {
  display: grid;
  gap: 14px;
}
.epreuve-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  cursor: pointer;
  text-align: left;
  width: 100%;
  color: var(--text);
  font-family: inherit;
  border-left: 4px solid var(--accent);
  transition: all 0.2s;
}
.epreuve-card:active { transform: scale(0.99); }
.epreuve-card .ep-num {
  display: inline-block;
  background: color-mix(in srgb, var(--accent) 18%, transparent);
  color: var(--accent);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1px;
  padding: 3px 8px;
  border-radius: 6px;
  margin-bottom: 8px;
}
.epreuve-card .ep-titre {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 4px;
  line-height: 1.4;
}
.epreuve-card .ep-source {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 8px;
  font-style: italic;
}
.epreuve-card .ep-meta {
  font-size: 12px;
  color: var(--accent);
  font-weight: 600;
}

/* ÉPREUVE DÉTAIL */
.epreuve-detail-header {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 14px;
}
.epreuve-detail-header h2 {
  font-size: 17px;
  margin-bottom: 6px;
}
.epreuve-detail-header .src {
  font-size: 12px;
  color: var(--text-muted);
  font-style: italic;
}

.epreuve-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 16px;
}
.epreuve-actions .btn-secondary { padding: 10px 14px; font-size: 13px; }

.epreuve-detail-content {
  display: grid;
  gap: 14px;
}

.question-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}
.question-card .q-num {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 6px;
  display: inline-block;
}
.question-card .q-bareme {
  font-size: 11px;
  color: var(--warning);
  font-weight: 600;
  margin-left: 8px;
}
.question-card .q-enonce {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 12px;
  line-height: 1.55;
  white-space: pre-wrap;
}
.question-card .reveal-btn {
  background: transparent;
  border: 1px dashed var(--border);
  color: var(--accent);
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
  font-family: inherit;
  font-weight: 600;
  width: 100%;
}
.question-card .correction {
  margin-top: 12px;
  padding: 12px;
  border-top: 1px solid var(--border);
  background: color-mix(in srgb, var(--success) 8%, transparent);
  border-radius: 8px;
  white-space: pre-wrap;
  font-family: "Cascadia Code", "Fira Code", Consolas, monospace;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text);
  overflow-x: auto;
}
.question-card .correction-label {
  display: block;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--success);
  text-transform: uppercase;
  margin-bottom: 6px;
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
}

.mode-card-wide { grid-column: 1 / -1; }

.auth-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(15, 23, 42, 0.62);
  backdrop-filter: blur(8px);
}
.auth-modal[hidden] { display: none; }
.auth-card {
  width: min(440px, 100%);
  max-height: min(760px, 92vh);
  overflow: auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px;
  box-shadow: var(--shadow-lg);
}
.auth-card h2,
.auth-card h3 {
  margin: 0 0 8px;
  color: var(--text);
}
.auth-card p {
  margin: 0 0 16px;
  color: var(--text-muted);
}
.auth-form {
  display: grid;
  gap: 10px;
}
.auth-form input,
.auth-form select {
  width: 100%;
  min-height: 48px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  padding: 0 14px;
  font: inherit;
}
.auth-message {
  min-height: 22px;
  margin: 10px 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}
.payment-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 14px 0;
}
.payment-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  color: var(--text);
  text-decoration: none;
}
.payment-note {
  padding: 10px 12px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--warning) 10%, transparent);
  color: var(--text);
  font-size: 0.9rem;
  line-height: 1.45;
}
.admin-panel {
  margin: 16px 0;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}
.admin-users {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}
.admin-user {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: color-mix(in srgb, var(--bg) 75%, transparent);
}
.admin-user strong {
  color: var(--accent);
  font-size: 0.8rem;
}
.admin-reset {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  padding: 6px 8px;
  font: inherit;
  font-size: 0.78rem;
  cursor: pointer;
}
.btn-auth {
  min-width: 68px;
  height: 42px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-card);
  color: var(--text);
  font-weight: 800;
  cursor: pointer;
}
.btn-auth.is-connected {
  border-color: var(--success);
  color: var(--success);
}

/* Responsive : tablette+ */
@media (min-width: 600px) {
  .cards-grid { grid-template-columns: repeat(2, 1fr); }
  .day-cards { grid-template-columns: repeat(2, 1fr); }
  .mode-cards { grid-template-columns: repeat(3, 1fr); }
  .mode-card-wide { grid-column: 1 / -1; }
}