/* CSS Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #ff6b6b;
    --primary-dark: #ee5a5a;
    --secondary: #4ecdc4;
    --accent: #ffe66d;
    --dark: #1a1a2e;
    --darker: #16162a;
    --light: #eaeaea;
    --success: #51cf66;
    --warning: #ffd43b;
    --text: #ffffff;
    --text-muted: #a0a0a0;
}

html, body {
    height: 100%;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: linear-gradient(135deg, var(--dark) 0%, var(--darker) 100%);
    color: var(--text);
    overflow: hidden;
}

#app {
    height: 100%;
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    position: relative;
}

/* Screens */
.screen {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 20px;
    overflow-y: auto;
    animation: fadeIn 0.3s ease;
}

.screen.active {
    display: flex;
    flex-direction: column;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    touch-action: manipulation;
}

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

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.4);
}

.btn-primary:hover:not(:disabled) {
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.6);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-large {
    padding: 16px 32px;
    font-size: 18px;
    border-radius: 16px;
}

.btn-small {
    padding: 8px 16px;
    font-size: 14px;
}

/* Welcome Screen */
.welcome-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
}

.welcome-content h1 {
    font-size: 2rem;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--accent) 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-content h2 {
    font-size: 1.8rem;
    color: var(--secondary);
    margin-bottom: 20px;
}

.welcome-text {
    color: var(--text-muted);
    margin-bottom: 40px;
    line-height: 1.6;
}

.welcome-note {
    margin-top: 30px;
    color: var(--text-muted);
    font-size: 14px;
}

/* Snowflakes */
.snowflakes {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
    z-index: 0;
}

.snowflake {
    position: absolute;
    top: -20px;
    color: rgba(255, 255, 255, 0.4);
    font-size: 1.5rem;
    animation: fall linear infinite;
}

.snowflake:nth-child(1) { left: 10%; animation-duration: 10s; animation-delay: 0s; }
.snowflake:nth-child(2) { left: 30%; animation-duration: 12s; animation-delay: 2s; }
.snowflake:nth-child(3) { left: 50%; animation-duration: 8s; animation-delay: 4s; }
.snowflake:nth-child(4) { left: 70%; animation-duration: 14s; animation-delay: 1s; }
.snowflake:nth-child(5) { left: 90%; animation-duration: 9s; animation-delay: 3s; }

@keyframes fall {
    to { transform: translateY(100vh) rotate(360deg); }
}

/* Setup Screen */
.setup-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 40px;
}

.upload-area {
    width: 100%;
    max-width: 300px;
    aspect-ratio: 1;
    border: 3px dashed rgba(255, 255, 255, 0.3);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 30px 0;
    cursor: pointer;
    transition: all 0.3s ease;
    overflow: hidden;
}

.upload-area:hover {
    border-color: var(--primary);
    background: rgba(255, 107, 107, 0.1);
}

.upload-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: var(--text-muted);
}

.upload-icon {
    font-size: 3rem;
}

.photo-preview {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Hub Screen */
.hub-header {
    text-align: center;
    margin-bottom: 20px;
}

.hub-header h2 {
    color: var(--accent);
    margin-bottom: 5px;
}

.progress-text {
    color: var(--text-muted);
}

.points-display {
    color: var(--accent);
    font-weight: bold;
    font-size: 1.1rem;
}

/* Puzzle Grid */
.puzzle-container {
    width: 100%;
    max-width: 300px;
    margin: 0 auto 30px;
    position: relative;
}

.puzzle-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4px;
    aspect-ratio: 1;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 4px;
}

.puzzle-slot {
    background: rgba(0, 0, 0, 0.4);
    border: 2px dashed rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--text-muted);
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.puzzle-slot.drop-hover {
    border-color: var(--accent);
    background: rgba(255, 230, 109, 0.2);
    transform: scale(1.05);
}

.puzzle-slot.filled {
    background: none;
    border: 2px solid var(--success);
}

.puzzle-slot img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 6px;
}

.slot-number {
    position: absolute;
    font-size: 1.5rem;
    font-weight: bold;
    opacity: 0.5;
}

/* Pieces Bank */
.pieces-bank {
    margin-top: 30px;
    text-align: center;
}

.pieces-bank h3 {
    color: var(--secondary);
    margin-bottom: 15px;
}

.pieces-bank-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    min-height: 80px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 15px;
    margin-bottom: 10px;
}

.puzzle-piece-draggable {
    width: 70px;
    height: 70px;
    position: relative;
    cursor: grab;
    transition: all 0.3s ease;
    border-radius: 8px;
    overflow: hidden;
    border: 2px solid transparent;
}

.puzzle-piece-draggable:hover {
    transform: scale(1.1);
    border-color: var(--accent);
}

.puzzle-piece-draggable.dragging {
    transform: scale(1.2) rotate(5deg);
    cursor: grabbing;
    z-index: 1000;
    opacity: 0.8;
}

.puzzle-piece-draggable img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    pointer-events: none;
}

.piece-label {
    position: absolute;
    bottom: 2px;
    right: 2px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    font-size: 0.7rem;
    font-weight: bold;
    padding: 1px 4px;
    border-radius: 3px;
    pointer-events: none;
}

.bank-hint {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-style: italic;
}

/* Additional draggable piece styles */
.draggable-piece {
    width: 70px;
    height: 70px;
    position: relative;
    cursor: grab;
    transition: all 0.3s ease;
    border-radius: 8px;
    overflow: hidden;
    border: 2px solid transparent;
}

.draggable-piece:hover {
    transform: scale(1.1);
    border-color: var(--accent);
}

.draggable-piece.dragging {
    transform: scale(1.2) rotate(5deg);
    cursor: grabbing;
    z-index: 1000;
    opacity: 0.8;
}

.draggable-piece img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.piece-number {
    position: absolute;
    top: 2px;
    right: 2px;
    background: var(--accent);
    color: var(--dark);
    border-radius: 50%;
    width: 20px;
    height: 20px;
    font-size: 12px;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(0,0,0,0.1);
}

.empty-bank {
    color: var(--text-muted);
    font-style: italic;
    padding: 20px;
}

/* Placement Feedback */
@keyframes fadeIn {
    from { opacity: 0; transform: translate(-50%, -50%) scale(0.8); }
    to { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}

@keyframes fadeOut {
    from { opacity: 1; transform: translate(-50%, -50%) scale(1); }
    to { opacity: 0; transform: translate(-50%, -50%) scale(0.8); }
}

/* Missions List */
.missions-container {
    flex: 1;
}

.missions-container h3 {
    text-align: center;
    margin-bottom: 15px;
    color: var(--secondary);
}

.missions-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.mission-card {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 15px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.mission-card:hover:not(.completed):not(.locked) {
    transform: translateX(5px);
    border-color: var(--primary);
}

.mission-card.completed {
    opacity: 0.5;
    cursor: default;
}

.mission-card.locked {
    opacity: 0.4;
    cursor: not-allowed;
}

.mission-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.mission-card.completed .mission-icon {
    background: var(--success);
}

.mission-info h4 {
    margin-bottom: 4px;
}

.mission-info p {
    font-size: 13px;
    color: var(--text-muted);
}

.mission-status {
    margin-left: auto;
    font-size: 1.2rem;
}

/* Game Screen */
.game-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.game-header h3 {
    flex: 1;
    text-align: center;
}

.game-timer {
    background: var(--dark);
    padding: 8px 16px;
    border-radius: 20px;
    font-family: monospace;
    font-size: 1.2rem;
    color: var(--accent);
}

.game-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    min-height: 300px;
}

.game-instructions {
    text-align: center;
    padding: 15px;
    color: var(--text-muted);
    font-size: 14px;
}

/* Game: Tap Targets */
.tap-target {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    border-radius: 50%;
    position: absolute;
    cursor: pointer;
    animation: pop 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.5);
}

@keyframes pop {
    0% { transform: scale(0); }
    80% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.tap-target:active {
    transform: scale(0.9);
}

/* Game: Memory Sequence */
.memory-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    max-width: 250px;
}

.memory-button {
    width: 100px;
    height: 100px;
    border-radius: 16px;
    border: none;
    cursor: pointer;
    transition: all 0.1s ease;
    opacity: 0.6;
}

.memory-button.active {
    opacity: 1;
    transform: scale(1.05);
    box-shadow: 0 0 30px currentColor;
}

.memory-button:nth-child(1) { background: #ff6b6b; }
.memory-button:nth-child(2) { background: #4ecdc4; }
.memory-button:nth-child(3) { background: #ffe66d; }
.memory-button:nth-child(4) { background: #a855f7; }

/* Game: Reaction */
.reaction-circle {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: #ff4444;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    transition: background 0.1s ease;
}

.reaction-circle.ready {
    background: #44ff44;
}

.reaction-circle.waiting {
    background: #ff4444;
}

.reaction-result {
    margin-top: 20px;
    font-size: 2rem;
    font-weight: bold;
}

/* Game: Speed Tap */
.speed-tap-area {
    width: 100%;
    height: 300px;
    position: relative;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    overflow: hidden;
}

.speed-target {
    width: 50px;
    height: 50px;
    background: var(--primary);
    border-radius: 50%;
    position: absolute;
    cursor: pointer;
    animation: pop 0.15s ease;
}

/* Game: Sliding Puzzle */
.sliding-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4px;
    width: 240px;
    height: 240px;
    background: rgba(0, 0, 0, 0.3);
    padding: 4px;
    border-radius: 12px;
}

.sliding-tile {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.15s ease;
}

.sliding-tile.empty {
    background: transparent;
    cursor: default;
}

.sliding-tile:not(.empty):hover {
    transform: scale(0.95);
}

/* Game: Quick Math */
.math-problem {
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 30px;
    color: var(--accent);
}

.math-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    width: 100%;
    max-width: 300px;
}

.math-option {
    padding: 20px;
    font-size: 1.5rem;
    font-weight: bold;
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    color: white;
    cursor: pointer;
    transition: all 0.2s ease;
}

.math-option:hover {
    border-color: var(--primary);
    background: rgba(255, 107, 107, 0.2);
}

.math-option.correct {
    background: var(--success);
    border-color: var(--success);
}

.math-option.wrong {
    background: var(--primary);
    border-color: var(--primary);
}

.math-progress {
    margin-top: 20px;
    color: var(--text-muted);
}

.math-timer-bar {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    margin-top: 20px;
    overflow: hidden;
}

.math-timer-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--success) 0%, var(--warning) 50%, var(--primary) 100%);
    transition: width 0.1s linear;
}

/* Game: Trace Shape */
.trace-canvas {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    touch-action: none;
}

/* Game: Dodge */
.dodge-area {
    width: 100%;
    height: 350px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    position: relative;
    overflow: hidden;
    touch-action: none;
}

.dodge-player {
    width: 40px;
    height: 40px;
    background: var(--secondary);
    border-radius: 50%;
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    transition: left 0.1s ease;
}

.dodge-obstacle {
    width: 40px;
    height: 40px;
    background: var(--primary);
    border-radius: 8px;
    position: absolute;
    top: -40px;
}

/* Complete Screen */
.complete-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.celebration {
    font-size: 4rem;
    animation: bounce 0.5s ease infinite alternate;
}

@keyframes bounce {
    from { transform: translateY(0); }
    to { transform: translateY(-10px); }
}

.piece-reveal {
    margin: 20px 0;
}

.revealed-piece {
    width: 100px;
    height: 100px;
    margin: 15px auto;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.revealed-piece img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.dad-message {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 20px;
    margin: 20px 0;
    max-width: 350px;
}

.message-label {
    color: var(--accent);
    font-size: 14px;
    margin-bottom: 10px;
}

.message-text {
    line-height: 1.6;
    font-style: italic;
}

/* Final Screen */
.final-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
}

.final-content h1 {
    color: var(--accent);
    margin-bottom: 20px;
}

.final-image-container {
    width: 100%;
    max-width: 300px;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
    margin-bottom: 20px;
}

.final-image {
    width: 100%;
    display: block;
}

.final-message {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 20px;
    margin: 20px 0;
    max-width: 350px;
}

.final-signature {
    margin-top: 20px;
    font-size: 1.2rem;
    color: var(--primary);
}

/* Confetti */
.confetti {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    overflow: hidden;
}

.confetti-piece {
    position: absolute;
    width: 10px;
    height: 10px;
    top: -20px;
    animation: confetti-fall linear forwards;
}

@keyframes confetti-fall {
    to {
        transform: translateY(100vh) rotate(720deg);
    }
}

/* Prizes Screen */
.prizes-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 30px;
}

.prize-summary {
    text-align: center;
    margin-bottom: 20px;
}

.prize-summary p {
    margin-bottom: 8px;
}

.prizes-list {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin: 20px 0;
    flex: 1;
    overflow-y: auto;
}

.prize-item {
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid transparent;
    border-radius: 12px;
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 15px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.prize-item:hover:not(.unaffordable) {
    border-color: var(--accent);
}

.prize-item.selected {
    border-color: var(--success);
    background: rgba(81, 207, 102, 0.2);
}

.prize-item.unaffordable {
    opacity: 0.4;
    cursor: not-allowed;
}

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

.prize-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.prize-name {
    font-weight: bold;
    font-size: 1rem;
}

.prize-cost {
    font-size: 0.8rem;
    color: var(--accent);
    font-weight: bold;
}

.prize-check {
    width: 24px;
    height: 24px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

.prize-item.selected .prize-check {
    background: var(--success);
    border-color: var(--success);
}

.prize-footer {
    text-align: center;
    margin-bottom: 15px;
}

.prize-footer p {
    margin-bottom: 5px;
    color: var(--accent);
    font-size: 1rem;
}

.points-spent {
    font-weight: bold;
}

.picks-remaining {
    font-size: 1.1rem;
    margin-bottom: 15px;
}

/* Score Display */
.score-display {
    font-size: 2rem;
    font-weight: bold;
    color: var(--accent);
    margin-bottom: 20px;
}

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

/* Mobile optimizations */
@media (max-width: 400px) {
    .welcome-content h1 {
        font-size: 1.6rem;
    }
    
    .welcome-content h2 {
        font-size: 1.4rem;
    }
    
    .puzzle-container {
        max-width: 260px;
    }
    
    .mission-card {
        padding: 12px;
    }
    
    .mission-icon {
        width: 40px;
        height: 40px;
    }
}