/* ============================================
   MEMORY PICTOGRAMMES - CSS PRINCIPAL
   NextGN Formation - Gamified Design
   ============================================ */

:root {
    /* Gamification Colors */
    --success: #4CAF50;
    --warning: #FF9800;
    --info: #2196F3;
    --accent: #FFD700;

    /* Shadows (alignées sur le langage visuel du site) */
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.15);
}

/* ============================================
   MAIN LAYOUT
   ============================================ */
main {
    margin-top: 70px;
    padding: 64px 40px 40px;
    min-height: calc(100vh - 70px);
}

.game-container {
    max-width: 1200px;
    margin: 0 auto;
}

/* ============================================
   INTRO SECTION
   ============================================ */
.intro-section {
    margin-bottom: 48px;
    animation: fadeIn 0.6s ease-out;
    text-align: center;
}

.intro-section h1 {
    font-family: 'Syne', sans-serif;
    font-size: clamp(28px, 5vw, 44px);
    font-weight: 800;
    color: var(--teal);
    margin-bottom: 8px;
    text-align: center;
}

.intro-section .subtitle {
    font-size: 18px;
    color: var(--text-muted);
    text-align: center;
    margin-bottom: 24px;
    font-weight: 300;
}

.intro-box {
    background: linear-gradient(135deg, var(--teal-light), var(--white));
    border-left: 4px solid var(--teal-mid);
    border-radius: 8px;
    padding: 20px;
    font-size: 0.95em;
    color: var(--text-muted);
    line-height: 1.6;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

/* ============================================
   GAME SECTION / PANEL
   ============================================ */
.game-section {
    margin-bottom: 80px;
    animation: fadeInUp 0.6s ease-out 0.3s both;
}

.game-panel {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: clamp(20px, 4vw, 40px);
    box-shadow: var(--shadow-sm);
}

/* ============================================
   DIFFICULTY SELECTOR
   ============================================ */
.difficulty-selector {
    margin-bottom: 32px;
    text-align: center;
}

.difficulty-selector label {
    display: block;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 14px;
}

.btn-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 12px;
    max-width: 520px;
    margin: 0 auto;
}

.btn-difficulty {
    background: var(--teal-light);
    background: linear-gradient(135deg, rgba(225, 245, 238, 0.5), transparent);
    border: 2px solid transparent;
    border-radius: 12px;
    padding: 14px 12px;
    font-family: 'Syne', sans-serif;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.btn-difficulty:hover {
    border-color: var(--teal-mid);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.btn-difficulty.active {
    background: linear-gradient(135deg, var(--teal-mid), var(--teal-dark));
    border-color: var(--teal-dark);
    box-shadow: var(--shadow-md);
}

.btn-difficulty.active .btn-label,
.btn-difficulty.active .btn-desc {
    color: var(--white);
}

.btn-icon {
    font-size: 20px;
    line-height: 1;
    margin-bottom: 2px;
}

.btn-label {
    font-size: 14px;
    font-weight: 700;
    color: var(--teal);
}

.btn-desc {
    font-size: 11px;
    font-family: 'DM Sans', sans-serif;
    color: var(--text-muted);
    font-weight: 400;
}

/* ============================================
   GAME GRID & CARDS
   ============================================ */
.game-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(clamp(70px, 15vw, 140px), 1fr));
    gap: clamp(12px, 2vw, 20px);
    max-width: 900px;
    margin: 0 auto 32px;
    padding: 20px;
    background: linear-gradient(135deg, rgba(225, 245, 238, 0.4), transparent);
    border-radius: 12px;
    border: 1px solid var(--teal-light);
}

/* MEMORY CARD STYLES */
.memory-card {
    position: relative;
    width: 100%;
    aspect-ratio: 1 / 1;
    cursor: pointer;
    perspective: 1000px;
    transform-style: preserve-3d;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    border-radius: 12px;
    overflow: hidden;
}

/* Card Front (Couverture) */
.card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    font-weight: bold;
    font-family: 'Syne', sans-serif;
    font-size: clamp(32px, 8vw, 56px);
}

.card-face.front {
    background:
        radial-gradient(circle at 30% 25%, rgba(255, 255, 255, 0.6), transparent 60%),
        linear-gradient(135deg, var(--teal-mid), var(--teal-dark));
    border: 2px solid var(--teal-dark);
    color: var(--white);
    box-shadow: var(--shadow-sm);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

.card-face.back {
    transform: rotateY(180deg);
    background: linear-gradient(135deg, var(--white), var(--teal-light));
    border: 2px solid var(--teal-mid);
    flex-direction: column;
    gap: 8px;
    padding: 8px;
    box-shadow: var(--shadow-sm);
}

.card-face.back img {
    max-width: 70%;
    max-height: 60%;
    object-fit: contain;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.card-face.back span {
    font-size: clamp(10px, 2vw, 13px);
    text-align: center;
    font-weight: 500;
    line-height: 1.2;
    color: var(--text);
    font-family: 'DM Sans', sans-serif;
}

/* Card States */
.memory-card:hover:not(.matched):not(.disabled) {
    transform: translateY(-8px) scale(1.05);
    box-shadow: var(--shadow-lg);
}

.memory-card.flipped .card-face.front {
    transform: rotateY(180deg);
}

.memory-card.flipped .card-face.back {
    transform: rotateY(0deg);
}

.memory-card.matched {
    animation: matchSuccess 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
    cursor: default;
}

.memory-card.matched .card-face.front {
    background: linear-gradient(135deg, var(--success), var(--success));
    border-color: var(--success);
    color: var(--white);
}

.memory-card.matched .card-face.back {
    background: linear-gradient(135deg, var(--white), rgba(76, 175, 80, 0.2));
    border-color: var(--success);
}

.memory-card.error {
    animation: cardShake 0.4s ease-in-out;
}

.memory-card.disabled {
    pointer-events: none;
}

/* ============================================
   FOOTER
   ============================================ */
footer {
    background: var(--text);
    color: var(--white);
    padding: 40px;
    text-align: center;
    font-size: 13px;
    margin-top: 80px;
}

/* ============================================
   BUTTONS (métriques héritées du style général du site)
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--teal-mid), var(--teal-dark));
    color: var(--white);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--white);
    border: 2px solid var(--teal-mid);
    color: var(--teal-mid);
}

.btn-secondary:hover {
    background: var(--teal-light);
    border-color: var(--teal-dark);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 768px) {
    main {
        padding: 32px 20px 20px;
    }

    .intro-section h1 {
        font-size: 28px;
    }

    .game-grid {
        gap: 12px;
        padding: 16px;
    }
    
    .game-controls {
        flex-direction: column;
        gap: 8px;
    }
    
    .game-controls .btn {
        width: 100%;
        justify-content: center;
    }
    
    footer {
        padding: 24px;
        font-size: 12px;
    }
}

@media (max-width: 480px) {
    main {
        padding: 24px 16px 16px;
    }

    .intro-section h1 {
        font-size: 24px;
    }
    
    .difficulty-selector label {
        font-size: 12px;
    }
    
    .btn-group {
        grid-template-columns: 1fr;
    }
    
    .game-hud {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
}