:root {
    --primary-color: #FF6B6B;
    --secondary-color: #4ECDC4;
    --accent-color: #FFE66D;
    --text-dark: #2C3E50;
    --text-light: #ECF0F1;
    --bg-color: #F7F9FC;
    --card-bg: #FFFFFF;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    --radius-md: 12px;
    --radius-lg: 20px;
}

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

html {
    overflow-x: hidden;
}

body {
    font-family: 'Rubik', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-dark);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    width: 100%;
}

.app-container {
    width: 100%;
    max-width: 600px;
    min-height: 100vh;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    background: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
    overflow-x: hidden; /* Prevent horizontal scroll from animations */
}

/* Splash Screen */
.splash-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-color);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease-out, visibility 0.5s ease-out;
}

.splash-screen.fade-out {
    opacity: 0;
    visibility: hidden;
}

.splash-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.splash-logo {
    width: 120px;
    height: 120px;
    object-fit: contain;
    animation: pulse 1s infinite ease-in-out;
    filter: drop-shadow(0 4px 10px rgba(0,0,0,0.1));
}

.splash-text {
    font-size: 2rem;
    color: var(--text-dark);
    font-weight: 700;
    opacity: 0;
    animation: fadeInUp 0.8s ease-out forwards;
    animation-delay: 0.2s;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Header Styles */
header {
    text-align: center;
    margin-bottom: 1rem;
    animation: fadeInDown 0.8s ease-out;
    display: flex;
    flex-direction: column;
    align-items: center;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.subtitle {
    color: #7F8C8D;
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

/* Difficulty Filter Button */
.difficulty-filter-btn {
    background: linear-gradient(135deg, #FF6B6B 0%, #FF8E8E 100%);
    border: none;
    border-radius: 25px;
    padding: 0.6rem 1.2rem;
    color: white;
    font-family: 'Rubik', sans-serif;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
    margin-top: 0.5rem;
}

.difficulty-filter-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.4);
}

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

.filter-icon {
    font-size: 1.1rem;
}


/* Card Container */
.card-container {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    perspective: 1000px;
    min-height: 400px;
    position: relative;
}

/* Deck Styles */
.deck {
    position: relative;
    width: 280px;
    height: 400px;
    cursor: pointer;
    transition: transform 0.3s ease;
}

.deck:hover {
    transform: scale(1.02);
}

.card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, var(--primary-color), #FF8E8E);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    display: flex;
    justify-content: center;
    align-items: center;
    border: 4px solid white;
}

.pattern {
    width: 80%;
    height: 80%;
    border: 2px dashed rgba(255,255,255,0.5);
    border-radius: var(--radius-md);
    background-image: radial-gradient(rgba(255,255,255,0.2) 2px, transparent 2px);
    background-size: 20px 20px;
}

.layer-1 {
    top: 5px;
    left: 5px;
    z-index: -1;
    opacity: 0.8;
    transform: rotate(2deg);
}

.layer-2 {
    top: 10px;
    left: 10px;
    z-index: -2;
    opacity: 0.6;
    transform: rotate(4deg);
}

/* Recipe Card Styles */
.card-display {
    width: 100%;
    max-width: 340px;
    /* Animation handled by .drawing class */
}

.card-display.drawing {
    animation: drawCardAnim 0.8s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes drawCardAnim {
    0% {
        opacity: 0;
        transform: scale(0.1) rotate(-180deg) translateY(100px);
    }
    100% {
        opacity: 1;
        transform: scale(1) rotate(0) translateY(0);
    }
}

.card-header {
    text-align: center;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid #f0f0f0;
    padding-bottom: 1rem;
}

.category-badge {
    background-color: var(--accent-color);
    color: var(--text-dark);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    display: inline-block;
    margin-bottom: 0.5rem;
}

.card-header h2 {
    font-size: 1.5rem;
    color: var(--text-dark);
}

.time-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    color: #7F8C8D;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.ingredients-section, .instructions-section {
    margin-bottom: 1.5rem;
}

h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

ul {
    list-style-position: inside;
    padding-right: 0.5rem;
}

li {
    margin-bottom: 0.25rem;
    font-size: 0.95rem;
}

p {
    line-height: 1.6;
    font-size: 0.95rem;
}

/* Controls */
.controls {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
    margin-top: 2rem;
}

#actionButtons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
    align-items: center;
}

.btn {
    border: none;
    padding: 1rem 2rem;
    border-radius: 50px;
    font-family: 'Rubik', sans-serif;
    font-size: 1.1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    max-width: 280px;
    box-shadow: var(--shadow-sm);
}

.btn:active {
    transform: scale(0.98);
}

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

.btn-primary:hover {
    background-color: #ff5252;
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: white;
    color: var(--text-dark);
    border: 2px solid #eee;
}

.btn-secondary:hover {
    border-color: var(--secondary-color);
    color: var(--secondary-color);
}

/* Utilities */
.hidden {
    display: none !important;
}

/* Animations */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Shuffle Animation */
.deck.shuffling {
    animation: deckShake 0.8s ease-in-out;
}

.deck.shuffling .layer-1 {
    animation: shuffleLeft 0.8s ease-in-out;
}

.deck.shuffling .layer-2 {
    animation: shuffleRight 0.8s ease-in-out;
}

@keyframes deckShake {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(0.95); }
}

@keyframes shuffleLeft {
    0% { transform: rotate(2deg) translateX(0); }
    25% { transform: rotate(-15deg) translateX(-80px); }
    50% { transform: rotate(-5deg) translateX(-40px); z-index: 1; }
    75% { transform: rotate(5deg) translateX(-20px); }
    100% { transform: rotate(2deg) translateX(0); }
}

@keyframes shuffleRight {
    0% { transform: rotate(4deg) translateX(0); }
    25% { transform: rotate(15deg) translateX(80px); }
    50% { transform: rotate(5deg) translateX(40px); z-index: 2; }
    75% { transform: rotate(-5deg) translateX(20px); }
    100% { transform: rotate(4deg) translateX(0); }
}

/* Mobile Optimization */
@media (max-width: 480px) {
    .app-container {
        padding: 1rem;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .deck {
        width: 240px;
        height: 340px;
    }
}

/* Source Link Styles */
.source-section {
    text-align: center;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid #f0f0f0;
}

.source-section a {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: color 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.source-section a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

.source-section a::after {
    content: '🔗';
    font-size: 0.8rem;
}