/* ============================================================
   法语识字卡 — Thème Fengshui clair
   Palette : rouge chinois, or, crème chaud
   ============================================================ */

/* ========== VARIABLES ========== */
:root {
  /* Couleurs */
  --color-bg:              #fef9f0;
  --color-surface:         #ffffff;
  --color-text:            #3d2c2c;
  --color-text-secondary:  #7a5c5c;
  --color-text-muted:      #b8a0a0;
  --color-accent:          #c23b3b;
  --color-accent-hover:    #9e2e2e;
  --color-accent-light:    #fef0ef;
  --color-gold:            #c8963c;
  --color-gold-light:      #fef9ef;
  --color-border:          #e8d5c4;
  --color-shadow:          rgba(194, 59, 59, 0.06);

  /* Polices */
  --font-sans:   'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-french: 'Playfair Display', 'Inter', serif;
  --font-chinese: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;

  /* Dimensions carte */
  --card-width:   380px;
  --card-height:  580px;
  --card-radius:  20px;

  /* Transitions */
  --ease-smooth:   cubic-bezier(0.4, 0, 0.2, 1);
  --flip-duration: 0.6s;
}

/* ========== RESET ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;

  /* Ambiance lumineuse */
  background-image:
    radial-gradient(ellipse at 20% 50%, rgba(194, 59, 59, 0.03) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(200, 150, 60, 0.04) 0%, transparent 60%),
    radial-gradient(ellipse at 50% 80%, rgba(194, 59, 59, 0.02) 0%, transparent 60%);
  background-attachment: fixed;
}

/* ========== EN-TÊTE ========== */
.app-header {
  text-align: center;
  padding: 2rem 1rem 0.5rem;
  width: 100%;
  max-width: 600px;
}

.app-title {
  font-family: var(--font-chinese);
  font-size: 2rem;
  font-weight: 900;
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  letter-spacing: 0.05em;
}

.title-icon {
  font-size: 2rem;
}

.app-subtitle {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 0.25rem;
}

/* ========== DROPDOWN THÈMES ========== */
.theme-select-wrapper {
  margin-top: 1.25rem;
  display: flex;
  justify-content: center;
}

.theme-select {
  font-family: var(--font-chinese);
  font-size: 1rem;
  font-weight: 500;
  padding: 0.7rem 2.5rem 0.7rem 1.25rem;
  border: 2px solid var(--color-border);
  border-radius: 14px;
  background-color: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%23c23b3b' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  background-size: 14px;
  min-width: 280px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  outline: none;
}

.theme-select:hover {
  border-color: var(--color-accent);
}

.theme-select:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

/* ========== ZONE PRINCIPALE ========== */
.main-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem 1rem 2rem;
  width: 100%;
  max-width: 600px;
}

/* ========== SCÈNE 3D ========== */
.card-scene {
  perspective: 1200px;
  width: var(--card-width);
  height: var(--card-height);
  margin-bottom: 1.5rem;
}

/* ========== CARTE ========== */
.flashcard {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform var(--flip-duration) var(--ease-smooth);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  -webkit-user-select: none;
}

.flashcard.is-flipped {
  transform: rotateY(180deg);
}

/* ========== FACES ========== */
.card-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--card-radius);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow:
    0 8px 40px var(--color-shadow),
    0 2px 8px rgba(0, 0, 0, 0.03);
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow: hidden;
}

.card-back {
  transform: rotateY(180deg);
}

/* ========== RECTO : Mot français ========== */
.card-word-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  width: 100%;
}

.card-word {
  font-family: var(--font-french);
  font-size: 2.8rem;
  font-weight: 700;
  font-style: italic;
  color: var(--color-text);
  text-align: center;
  line-height: 1.3;
  word-break: break-word;
}

.card-front-footer {
  padding: 0 0 3rem 0;
  display: flex;
  justify-content: center;
  margin-top: auto;
}

/* ========== VERSO : 4 zones ========== */
.card-back-content {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: space-evenly;
  padding: 1.25rem;
  overflow-y: auto;
}

.back-zone {
  width: 100%;
  flex-shrink: 0;
}

/* 1. Traduction chinoise */
.back-zone-translation {
  text-align: center;
}

.card-translation {
  font-family: var(--font-chinese);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
  margin: 0;
}

/* 2. Approximation phonétique */
.back-zone-approx {
  text-align: center;
  background: var(--color-accent-light);
  border: 1px solid rgba(194, 59, 59, 0.12);
  border-radius: 14px;
  padding: 0.85rem 1.25rem;
}

.approx-label {
  font-size: 0.8rem;
  color: var(--color-accent);
  font-weight: 700;
  display: block;
  margin-bottom: 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card-approx {
  font-family: var(--font-chinese);
  font-size: 1.35rem;
  color: var(--color-accent);
  font-weight: 600;
  line-height: 1.5;
  margin: 0;
}

/* 3. Phrase d'exemple */
.back-zone-exemple {
  background: var(--color-gold-light);
  border-left: 4px solid var(--color-gold);
  border-radius: 0 12px 12px 0;
  padding: 0.85rem 1.1rem;
  text-align: left;
}

.exemple-phrase {
  font-family: var(--font-french);
  font-size: 1.6rem;
  font-style: italic;
  color: var(--color-text);
  margin: 0 0 0.4rem 0;
  line-height: 1.5;
}

.exemple-translation {
  font-family: var(--font-chinese);
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.5;
}

/* 4. Bouton audio */
.back-zone-audio {
  display: flex;
  justify-content: center;
}

/* ========== BOUTON AUDIO ========== */
.btn-icon {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-accent);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.btn-icon:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
  transform: scale(1.05);
}

.btn-icon:active {
  transform: scale(0.95);
}

.btn-icon-back {
  width: 88px;
  height: 88px;
  flex-shrink: 0;
}

.btn-icon-speaking {
  animation: pulse-audio 0.8s ease-in-out infinite;
  border-color: var(--color-accent);
  background: var(--color-accent-light);
}

@keyframes pulse-audio {
  0%, 100% { box-shadow: 0 0 0 0 rgba(194, 59, 59, 0.3); }
  50%      { box-shadow: 0 0 0 12px rgba(194, 59, 59, 0); }
}

/* ========== NAVIGATION ========== */
.nav-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.btn-nav {
  font-family: var(--font-chinese);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.65rem 1.25rem;
  border: 2px solid var(--color-border);
  border-radius: 14px;
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.btn-nav:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
}

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

.btn-random {
  border-color: var(--color-gold);
  color: var(--color-gold);
  background: var(--color-gold-light);
}

.btn-random:hover {
  border-color: var(--color-gold);
  background: var(--color-gold-light);
  box-shadow: 0 0 0 4px rgba(200, 150, 60, 0.1);
}

/* ========== COMPTEUR ========== */
.card-counter {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 0.25rem;
}

/* ========== RACCOURCIS ========== */
.keyboard-hints {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 0.5rem;
}

.keyboard-hints kbd {
  display: inline-block;
  padding: 0.15em 0.5em;
  font-size: 0.85em;
  font-family: var(--font-sans);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  color: var(--color-text-secondary);
}

/* ========== PIED DE PAGE ========== */
.app-footer {
  text-align: center;
  padding: 0.75rem 1rem 1.25rem;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.app-footer a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.app-footer a:hover {
  color: var(--color-text-secondary);
}

/* ========== ANIMATION D'ENTRÉE ========== */
.card-enter {
  animation: cardEnter 0.35s var(--ease-smooth);
}

@keyframes cardEnter {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========== RESPONSIVE ========== */

/* Grands écrans */
@media (min-width: 1200px) {
  :root {
    --card-width: 420px;
    --card-height: 620px;
  }
  .card-word { font-size: 3.2rem; }
  .card-translation { font-size: 2.2rem; }
}

/* Tablettes */
@media (max-width: 768px) {
  :root {
    --card-width: 340px;
    --card-height: 530px;
  }
  .card-word { font-size: 2.4rem; }
  .card-translation { font-size: 1.8rem; }
  .app-title { font-size: 1.6rem; }
}

/* Mobiles */
@media (max-width: 480px) {
  :root {
    --card-width: 300px;
    --card-height: 480px;
  }
  .card-word { font-size: 2rem; }
  .card-translation { font-size: 1.6rem; }
  .keyboard-hints { display: none; }
  .nav-controls { gap: 0.4rem; }
  .btn-nav {
    font-size: 0.8rem;
    padding: 0.55rem 0.9rem;
  }
  .theme-select { min-width: 240px; font-size: 0.9rem; }
  .card-translation { font-size: 1.5rem; }
  .card-approx { font-size: 1.1rem; }
  .back-zone-approx { padding: 0.7rem 0.9rem; }
  .back-zone-exemple { padding: 0.7rem 0.9rem; }
  .card-back-content { padding: 0.9rem 0.8rem; }
}

/* Très petits écrans */
@media (max-width: 360px) {
  :root {
    --card-width: 260px;
    --card-height: 440px;
  }
  .card-word { font-size: 1.7rem; }
  .card-translation { font-size: 1.3rem; }
  .card-approx { font-size: 1rem; }
  .back-zone-approx { padding: 0.6rem 0.8rem; }
  .btn-nav {
    font-size: 0.75rem;
    padding: 0.45rem 0.7rem;
  }
}

/* ========== MODE PWA (standalone) ========== */
@media (display-mode: standalone) {
  .app-footer { display: none; }
  body {
    padding-top: env(safe-area-inset-top);
    padding-bottom: env(safe-area-inset-bottom);
  }
}

/* ========== ACCESSIBILITÉ ========== */
@media (prefers-reduced-motion: reduce) {
  .flashcard { transition: transform 0.15s; }
  .card-enter { animation: none; }
  .btn-icon:hover, .btn-nav:hover { transform: none; }
  .btn-icon:active, .btn-nav:active { transform: none; }
}