/* Memory Theme - Mobile-First */

:root {
    --primary: #FF9800;
    --secondary: #F57C00;
    --tertiary: #FFB74D;
    --accent: #FFC107;
}

/* Background gradient */
body {
    background: linear-gradient(135deg, #FFF3E0 0%, #FFE0B2 100%);
}

/* Decorative background circles */
body::before {
    background: var(--primary);
}

body::after {
    background: var(--secondary);
}

/* Card styling */
.card {
    border-color: var(--primary);
}

.card::before {
    content: '🃏';
}

/* Buttons */
.btn-start {
    background: linear-gradient(135deg, var(--primary), var(--tertiary));
}

.btn-back {
    color: var(--primary);
    border-color: var(--primary);
}

.btn-back:hover {
    background: var(--primary);
    color: white;
}

/* Slider */
input[type="range"]::-webkit-slider-thumb {
    border-color: var(--primary);
}

input[type="range"]::-moz-range-thumb {
    border-color: var(--primary);
}

/* Milestone celebration */
.milestone-celebration {
    background: linear-gradient(135deg, var(--primary), var(--secondary)) !important;
    z-index: 99999 !important;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5) !important;
}

/* Crown cost display */
.crown-cost {
    text-align: center;
    font-family: 'Fredoka', sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--secondary);
    margin-top: 0.5rem;
}

/* Preview section */
.preview {
    text-align: center;
}

.preview-header {
    border-bottom-color: var(--primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.preview-title {
    color: var(--primary);
    margin: 0;
}

/* Stats display */
.memory-stats {
    display: flex;
    gap: 1rem;
    font-family: 'Fredoka', sans-serif;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--secondary);
}

.highscore-label {
    color: #B8860B;
}

/* === MEMORY GRID === */
.memory-grid {
    display: grid;
    gap: 8px;
    width: 100%;
    max-width: 400px;
    margin: 1rem auto;
}

/* === MEMORY CARD === */
.memory-card {
    aspect-ratio: 1;
    perspective: 600px;
    cursor: pointer;
}

.memory-card-inner {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.5s ease;
}

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

.memory-card-back,
.memory-card-front {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Fredoka', sans-serif;
    font-weight: 700;
}

.memory-card-back {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    font-size: 1.8rem;
    box-shadow: 0 4px 12px rgba(255, 152, 0, 0.3);
}

.memory-card-front {
    background: white;
    font-size: 2.2rem;
    transform: rotateY(180deg);
    border: 3px solid var(--tertiary);
    box-shadow: 0 4px 12px rgba(255, 152, 0, 0.15);
}

/* Matched cards */
.memory-card.matched .memory-card-front {
    border-color: #4CAF50;
    box-shadow: 0 0 16px rgba(76, 175, 80, 0.4);
}

.memory-card.matched {
    animation: bounceIn 0.5s ease-out;
}

/* Hover effect on unflipped cards */
.memory-card:not(.flipped):not(.matched):hover .memory-card-back {
    box-shadow: 0 6px 20px rgba(255, 152, 0, 0.5);
    transform: scale(1.03);
}

/* Control buttons */
.memory-controls {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    margin-top: 1rem;
}

.btn-new {
    background: linear-gradient(135deg, var(--secondary), #4DB6AC);
    max-width: 250px;
}

.btn-new:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn-new:active {
    transform: translateY(0);
}

/* === RESPONSIVE === */

/* Small phones (>=360px) */
@media (min-width: 360px) {
    .memory-card-back {
        font-size: 2rem;
    }

    .memory-card-front {
        font-size: 2.4rem;
    }
}

/* Large phones (>=480px) */
@media (min-width: 480px) {
    .memory-grid {
        gap: 10px;
    }

    .memory-card-back {
        font-size: 2.2rem;
    }

    .memory-card-front {
        font-size: 2.8rem;
    }
}

/* Tablets (>=768px) */
@media (min-width: 768px) {
    .memory-grid {
        gap: 12px;
        max-width: 500px;
    }

    .memory-card-back {
        font-size: 2.5rem;
    }

    .memory-card-front {
        font-size: 3.2rem;
    }

    .memory-card-back,
    .memory-card-front {
        border-radius: 16px;
    }
}

/* Desktop (>=1024px) */
@media (min-width: 1024px) {
    .memory-grid {
        max-width: 550px;
    }

    .memory-card-back {
        font-size: 2.8rem;
    }

    .memory-card-front {
        font-size: 3.5rem;
    }
}

/* Mobile-specific optimizations */
@media (max-width: 767px) {
    .preview {
        padding: 0.5rem !important;
    }

    .preview-header {
        flex-direction: column;
        gap: 0.5rem;
        margin-bottom: 0.75rem;
    }

    .preview-title {
        font-size: 0.95rem;
    }

    h1 {
        font-size: 1.6rem;
    }

    .subtitle {
        font-size: 0.85rem;
    }

    .card {
        padding: 0.75rem !important;
    }

    .form-group label {
        font-size: 0.85rem;
    }

    .slider-value {
        font-size: 0.75rem;
    }

    .slider-labels span {
        font-size: 0.65rem;
    }

    .memory-stats {
        font-size: 0.8rem;
    }
}