/* ===== CSS Variables & Base Styles ===== */
:root {
    --primary: #FF6B6B;
    --primary-dark: #EE5A5A;
    --secondary: #4ECDC4;
    --secondary-dark: #3DBDB5;
    --accent: #FFE66D;
    --accent-dark: #FFD93D;
    --purple: #A855F7;
    --purple-dark: #9333EA;
    --blue: #3B82F6;
    --blue-dark: #2563EB;
    --pink: #EC4899;
    --green: #22C55E;
    --orange: #F97316;
    
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    --card-bg: rgba(255, 255, 255, 0.95);
    --text-dark: #1F2937;
    --text-light: #6B7280;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 30px rgba(255, 255, 255, 0.3);
    
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    
    --font-main: 'Fredoka', sans-serif;
    --font-title: 'Titan One', cursive;
}

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

body {
    font-family: var(--font-main);
    background: var(--bg-gradient);
    min-height: 100vh;
    overflow: hidden;
    color: var(--text-dark);
}

/* ===== Background Shapes ===== */
.bg-shapes {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.1;
    animation: float 20s infinite ease-in-out;
}

.shape-1 {
    width: 300px;
    height: 300px;
    background: var(--accent);
    top: -100px;
    left: -100px;
    animation-delay: 0s;
}

.shape-2 {
    width: 200px;
    height: 200px;
    background: var(--secondary);
    top: 50%;
    right: -50px;
    animation-delay: -5s;
}

.shape-3 {
    width: 150px;
    height: 150px;
    background: var(--primary);
    bottom: 10%;
    left: 10%;
    animation-delay: -10s;
}

.shape-4 {
    width: 250px;
    height: 250px;
    background: var(--pink);
    bottom: -100px;
    right: 20%;
    animation-delay: -15s;
}

.shape-5 {
    width: 180px;
    height: 180px;
    background: var(--blue);
    top: 30%;
    left: 5%;
    animation-delay: -7s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(30px, -30px) rotate(90deg); }
    50% { transform: translate(0, -50px) rotate(180deg); }
    75% { transform: translate(-30px, -30px) rotate(270deg); }
}

/* ===== Game Wrapper ===== */
.game-wrapper {
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    z-index: 1;
}

/* ===== Screens ===== */
.screen {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    position: absolute;
    top: 0;
    left: 0;
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.screen.hidden {
    opacity: 0;
    pointer-events: none;
    transform: scale(0.95);
}

/* ===== Start Screen ===== */
.start-content {
    text-align: center;
    padding: 2rem;
    max-width: 600px;
}

.game-title {
    margin-bottom: 1rem;
}

.title-word {
    display: block;
    font-family: var(--font-title);
    font-size: clamp(3rem, 10vw, 5rem);
    color: white;
    text-shadow: 
        4px 4px 0 var(--primary),
        8px 8px 0 rgba(0, 0, 0, 0.2);
    animation: titleBounce 2s infinite ease-in-out;
}

.title-word:nth-child(2) {
    animation-delay: 0.1s;
    color: var(--accent);
    text-shadow: 
        4px 4px 0 var(--orange),
        8px 8px 0 rgba(0, 0, 0, 0.2);
}

.title-arcade {
    display: block;
    font-family: var(--font-title);
    font-size: clamp(2rem, 6vw, 3rem);
    color: var(--secondary);
    text-shadow: 
        3px 3px 0 var(--secondary-dark),
        6px 6px 0 rgba(0, 0, 0, 0.2);
    margin-top: 0.5rem;
    animation: titleBounce 2s infinite ease-in-out;
    animation-delay: 0.2s;
}

@keyframes titleBounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.start-mascot {
    font-size: 4rem;
    margin: 1rem 0;
    animation: spin 3s infinite linear;
}

@keyframes spin {
    0% { transform: rotate(0deg) scale(1); }
    50% { transform: rotate(180deg) scale(1.1); }
    100% { transform: rotate(360deg) scale(1); }
}

/* Difficulty Selector */
.difficulty-selector {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin: 1.5rem 0;
    box-shadow: var(--shadow-md);
}

.difficulty-selector h2 {
    font-size: 1.2rem;
    color: var(--text-dark);
    margin-bottom: 1rem;
    font-weight: 600;
}

.difficulty-buttons {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    flex-wrap: wrap;
}

.difficulty-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1rem 1.5rem;
    border: 3px solid transparent;
    border-radius: var(--radius-md);
    background: linear-gradient(145deg, #f3f4f6, #e5e7eb);
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 110px;
}

.difficulty-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-sm);
}

.difficulty-btn.selected {
    border-color: var(--purple);
    background: linear-gradient(145deg, #faf5ff, #f3e8ff);
    box-shadow: 0 0 20px rgba(168, 85, 247, 0.3);
}

.diff-emoji {
    font-size: 2rem;
    margin-bottom: 0.25rem;
}

.diff-name {
    font-weight: 600;
    color: var(--text-dark);
    font-size: 1rem;
}

.diff-desc {
    font-size: 0.75rem;
    color: var(--text-light);
}

/* Buttons */
.big-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem 2.5rem;
    font-family: var(--font-main);
    font-size: 1.3rem;
    font-weight: 600;
    color: white;
    background: linear-gradient(145deg, var(--green), #16a34a);
    border: none;
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 
        0 4px 0 #15803d,
        var(--shadow-md);
}

.big-btn:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 
        0 7px 0 #15803d,
        var(--shadow-lg);
}

.big-btn:active:not(:disabled) {
    transform: translateY(2px);
    box-shadow: 
        0 2px 0 #15803d,
        var(--shadow-sm);
}

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

.big-btn.pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 4px 0 #15803d, var(--shadow-md); }
    50% { box-shadow: 0 4px 0 #15803d, 0 0 30px rgba(34, 197, 94, 0.5); }
}

.btn-icon {
    font-size: 1.5rem;
}

.secondary-btn {
    padding: 0.75rem 2rem;
    font-family: var(--font-main);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-dark);
    background: var(--card-bg);
    border: 2px solid #e5e7eb;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.3s ease;
}

.secondary-btn:hover {
    background: #f3f4f6;
    border-color: #d1d5db;
}

.high-score-display {
    margin-top: 1.5rem;
    padding: 0.75rem 1.5rem;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-lg);
    color: white;
    font-size: 1.1rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.trophy {
    font-size: 1.3rem;
}

/* ===== Game Screen ===== */
#game-screen {
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
    padding: 0;
}

/* HUD */
.game-hud {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-md);
    z-index: 10;
    flex-wrap: wrap;
}

.hud-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: linear-gradient(145deg, #f8fafc, #f1f5f9);
    border-radius: var(--radius-md);
    min-width: 100px;
}

.hud-icon {
    font-size: 1.5rem;
}

.hud-content {
    display: flex;
    flex-direction: column;
}

.hud-label {
    font-size: 0.7rem;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.hud-value {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-dark);
}

.combo-display .hud-value {
    color: var(--orange);
}

.timer-display.warning .hud-value {
    color: var(--primary);
    animation: timerPulse 0.5s infinite;
}

@keyframes timerPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.control-btn {
    width: 50px;
    height: 50px;
    border: none;
    border-radius: var(--radius-md);
    background: linear-gradient(145deg, #f8fafc, #e2e8f0);
    cursor: pointer;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.control-btn:hover {
    background: linear-gradient(145deg, #e2e8f0, #cbd5e1);
    transform: scale(1.05);
}

.quit-btn {
    background: linear-gradient(145deg, #fef2f2, #fee2e2);
}

.quit-btn:hover {
    background: linear-gradient(145deg, #fee2e2, #fecaca);
}

/* Game Area */
#game-area {
    flex: 1;
    min-height: 300px;
    position: relative;
    overflow: hidden;
    background: 
        radial-gradient(ellipse at top, rgba(255,255,255,0.1) 0%, transparent 50%),
        linear-gradient(180deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
}

#letters-container {
    width: 100%;
    height: 100%;
    position: relative;
}

/* Falling Letters */
.falling-letter {
    position: absolute;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-title);
    font-size: 2rem;
    color: white;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    user-select: none;
    z-index: 5;
    box-shadow: 
        0 4px 0 rgba(0, 0, 0, 0.2),
        var(--shadow-sm);
}

.falling-letter:hover {
    transform: scale(1.1);
    box-shadow: 
        0 6px 0 rgba(0, 0, 0, 0.2),
        var(--shadow-md);
}

.falling-letter.selected {
    transform: scale(0.95);
    opacity: 0.6;
    box-shadow: 
        0 2px 0 rgba(0, 0, 0, 0.2),
        inset 0 0 20px rgba(255, 255, 255, 0.3);
}

.falling-letter.removing {
    animation: letterPop 0.4s ease forwards;
}

@keyframes letterPop {
    0% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.3); opacity: 0.5; }
    100% { transform: scale(0); opacity: 0; }
}

/* Letter colors */
.letter-red { background: linear-gradient(145deg, var(--primary), var(--primary-dark)); }
.letter-blue { background: linear-gradient(145deg, var(--blue), var(--blue-dark)); }
.letter-green { background: linear-gradient(145deg, var(--green), #16a34a); }
.letter-purple { background: linear-gradient(145deg, var(--purple), var(--purple-dark)); }
.letter-orange { background: linear-gradient(145deg, var(--orange), #ea580c); }
.letter-pink { background: linear-gradient(145deg, var(--pink), #db2777); }
.letter-teal { background: linear-gradient(145deg, var(--secondary), var(--secondary-dark)); }

/* Pause Overlay */
.overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    backdrop-filter: blur(5px);
}

.overlay.hidden {
    display: none;
}

.overlay-content {
    text-align: center;
    color: white;
}

.overlay-content h2 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

/* Word Builder */
.word-builder {
    padding: 1rem;
    background: var(--card-bg);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.current-word-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    max-width: 600px;
}

.current-word {
    flex: 1;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: linear-gradient(145deg, #f8fafc, #f1f5f9);
    border: 3px dashed #e2e8f0;
    border-radius: var(--radius-lg);
}

.placeholder-text {
    color: var(--text-light);
    font-size: 1rem;
}

.word-letter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 45px;
    height: 45px;
    font-family: var(--font-title);
    font-size: 1.5rem;
    color: white;
    border-radius: var(--radius-sm);
    animation: letterAppear 0.2s ease;
    box-shadow: 0 2px 0 rgba(0, 0, 0, 0.2);
}

@keyframes letterAppear {
    0% { transform: scale(0) rotate(-10deg); }
    100% { transform: scale(1) rotate(0deg); }
}

.action-btn {
    width: 50px;
    height: 50px;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 1.3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.clear-btn {
    background: linear-gradient(145deg, #fef2f2, #fee2e2);
    color: var(--primary);
}

.clear-btn:hover {
    background: linear-gradient(145deg, #fee2e2, #fecaca);
    transform: scale(1.05);
}

.word-actions {
    display: flex;
    gap: 0.75rem;
}

.submit-btn {
    background: linear-gradient(145deg, var(--purple), var(--purple-dark));
    box-shadow: 
        0 4px 0 #7c3aed,
        var(--shadow-md);
}

.submit-btn:hover:not(:disabled) {
    box-shadow: 
        0 7px 0 #7c3aed,
        var(--shadow-lg);
}

.submit-btn:active:not(:disabled) {
    box-shadow: 
        0 2px 0 #7c3aed,
        var(--shadow-sm);
}

/* Feedback */
.feedback {
    min-height: 1.5rem;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

.feedback.success {
    color: var(--green);
    animation: feedbackPop 0.5s ease;
}

.feedback.error {
    color: var(--primary);
    animation: shake 0.5s ease;
}

@keyframes feedbackPop {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-5px); }
    40%, 80% { transform: translateX(5px); }
}

/* ===== Game Over Screen ===== */
.gameover-content {
    text-align: center;
    padding: 2rem;
    max-width: 500px;
    position: relative;
    z-index: 10;
}

.gameover-title {
    font-family: var(--font-title);
    font-size: clamp(2.5rem, 8vw, 4rem);
    color: white;
    text-shadow: 
        4px 4px 0 var(--purple),
        8px 8px 0 rgba(0, 0, 0, 0.2);
    margin-bottom: 1.5rem;
}

.final-stats {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow-lg);
}

.stat-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1rem;
}

.stat-card.main-stat {
    border-bottom: 2px solid #f1f5f9;
    margin-bottom: 1rem;
    padding-bottom: 1.5rem;
}

.stat-icon {
    font-size: 2rem;
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-dark);
}

.main-stat .stat-value {
    font-size: 3rem;
    color: var(--purple);
}

.stat-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
}

.stat-row .stat-icon {
    font-size: 1.5rem;
}

.stat-row .stat-value {
    font-size: 1.3rem;
}

.new-high-score {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(145deg, var(--accent), var(--accent-dark));
    border-radius: var(--radius-lg);
    color: var(--text-dark);
    font-weight: 700;
    font-size: 1.2rem;
    margin-bottom: 1rem;
    animation: highScoreGlow 1s infinite;
}

.new-high-score.hidden {
    display: none;
}

@keyframes highScoreGlow {
    0%, 100% { box-shadow: 0 0 20px rgba(255, 230, 109, 0.5); }
    50% { box-shadow: 0 0 40px rgba(255, 230, 109, 0.8); }
}

.trophy-bounce {
    animation: trophyBounce 0.5s infinite;
}

@keyframes trophyBounce {
    0%, 100% { transform: translateY(0) rotate(-5deg); }
    50% { transform: translateY(-5px) rotate(5deg); }
}

.gameover-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

/* Confetti */
.confetti-container {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 5;
}

.confetti {
    position: absolute;
    width: 10px;
    height: 10px;
    border-radius: 2px;
    animation: confettiFall 3s linear forwards;
}

@keyframes confettiFall {
    0% {
        transform: translateY(-100px) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}

/* ===== Celebration Effects ===== */
.celebration {
    position: fixed;
    font-size: 3rem;
    pointer-events: none;
    z-index: 1000;
    animation: celebrationFloat 1s ease forwards;
}

@keyframes celebrationFloat {
    0% {
        transform: scale(0) translateY(0);
        opacity: 1;
    }
    50% {
        transform: scale(1.5) translateY(-30px);
        opacity: 1;
    }
    100% {
        transform: scale(1) translateY(-80px);
        opacity: 0;
    }
}

/* Score popup */
.score-popup {
    position: fixed;
    font-family: var(--font-title);
    font-size: 2rem;
    color: var(--accent);
    text-shadow: 2px 2px 0 var(--orange);
    pointer-events: none;
    z-index: 1000;
    animation: scoreFloat 1s ease forwards;
}

@keyframes scoreFloat {
    0% {
        transform: scale(0.5) translateY(0);
        opacity: 1;
    }
    100% {
        transform: scale(1.2) translateY(-60px);
        opacity: 0;
    }
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .difficulty-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .difficulty-btn {
        width: 100%;
        max-width: 200px;
        flex-direction: row;
        justify-content: flex-start;
        gap: 1rem;
    }
    
    .game-hud {
        gap: 0.5rem;
        padding: 0.75rem;
    }
    
    .hud-item {
        padding: 0.4rem 0.75rem;
        min-width: auto;
    }
    
    .hud-icon {
        font-size: 1.2rem;
    }
    
    .hud-value {
        font-size: 1.1rem;
    }
    
    .falling-letter {
        width: 50px;
        height: 50px;
        font-size: 1.6rem;
    }
    
    .word-letter {
        width: 38px;
        height: 38px;
        font-size: 1.2rem;
    }
    
    .big-btn {
        padding: 0.85rem 2rem;
        font-size: 1.1rem;
    }
    
    .stat-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .title-word {
        font-size: 2.5rem;
    }
    
    .title-arcade {
        font-size: 1.5rem;
    }
    
    .falling-letter {
        width: 44px;
        height: 44px;
        font-size: 1.4rem;
    }
    
    .word-letter {
        width: 34px;
        height: 34px;
        font-size: 1.1rem;
    }
    
    .current-word {
        min-height: 50px;
    }
}

/* Tablet landscape optimizations */
@media (min-width: 769px) and (max-width: 1024px) {
    .game-hud {
        gap: 1.5rem;
    }
    
    .falling-letter {
        width: 55px;
        height: 55px;
        font-size: 1.8rem;
    }
}