:root {
    /* Color Palette - Vibrant Ocean Theme */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --danger-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);

    --bg-primary: #0f0c29;
    --bg-secondary: #1a1640;
    --bg-tertiary: #2d2557;

    --text-primary: #ffffff;
    --text-secondary: #b8b5d1;
    --text-accent: #667eea;

    --droplet-bg: rgba(102, 126, 234, 0.15);
    --droplet-border: rgba(102, 126, 234, 0.3);
    --droplet-glow: rgba(102, 126, 234, 0.5);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 50%;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.4);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

body {
    font-family: 'Poppins', sans-serif;
    background: var(--bg-primary);
    background-image:
        radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.1) 0%, transparent 50%);
    color: var(--text-primary);
    overflow: hidden;
    min-height: 100vh;
}

.game-container {
    width: 100%;
    height: 100vh;
    /* Fallback */
    height: 100dvh;
    display: flex;
    flex-direction: column;
    position: relative;
}

/* Header Styles */
.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(26, 22, 64, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(102, 126, 234, 0.2);
    z-index: 100;
}

.back-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(102, 126, 234, 0.1);
    border: 1px solid rgba(102, 126, 234, 0.3);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: 'Poppins', sans-serif;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
}

.back-btn:hover {
    background: rgba(102, 126, 234, 0.2);
    border-color: rgba(102, 126, 234, 0.5);
    transform: translateX(-4px);
}

.back-btn:active {
    transform: translateX(-2px) scale(0.98);
}

.stats-container {
    display: flex;
    gap: var(--spacing-md);
}

.stat {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(45, 37, 87, 0.6);
    border-radius: var(--radius-md);
    font-family: 'Outfit', sans-serif;
    font-size: 1.1rem;
    font-weight: 700;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.lives-stat {
    color: #ff6b9d;
}

.lives-stat svg {
    color: #ff6b9d;
    filter: drop-shadow(0 0 8px rgba(255, 107, 157, 0.5));
}

.score-stat {
    color: #ffd93d;
}

.score-stat svg {
    fill: #ffd93d;
    filter: drop-shadow(0 0 8px rgba(255, 217, 61, 0.5));
}

/* Game Area */
.game-area {
    flex: 1;
    position: relative;
    overflow: hidden;
    background: linear-gradient(180deg,
            rgba(15, 12, 41, 0.5) 0%,
            rgba(26, 22, 64, 0.8) 100%);
}

/* Droplet Styles */
.droplet {
    position: absolute;
    width: 100px;
    height: 100px;
    background: var(--droplet-bg);
    border: 2px solid var(--droplet-border);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Outfit', sans-serif;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    backdrop-filter: blur(10px);
    box-shadow:
        0 4px 16px rgba(0, 0, 0, 0.3),
        inset 0 2px 8px rgba(255, 255, 255, 0.1),
        0 0 20px var(--droplet-glow);
    animation: float 0.5s ease-in-out infinite alternate;
    cursor: default;
    user-select: none;
    transition: all var(--transition-normal);
}

.droplet::before {
    content: '';
    position: absolute;
    top: 15%;
    left: 20%;
    width: 30%;
    height: 30%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.3) 0%, transparent 70%);
    border-radius: var(--radius-full);
    pointer-events: none;
}

.droplet.falling {
    animation: fall linear forwards, float 0.5s ease-in-out infinite alternate;
}

@keyframes fall {
    from {
        top: -120px;
    }

    to {
        top: calc(100% - 120px);
    }
}

@keyframes float {
    from {
        transform: translateY(0px);
    }

    to {
        transform: translateY(-5px);
    }
}

.droplet.burst {
    animation: burstAnimation 0.5s ease-out forwards;
}

.droplet.burst-wrong {
    background: rgba(255, 107, 157, 0.25);
    border-color: rgba(255, 107, 157, 0.5);
    box-shadow: 0 0 20px rgba(255, 107, 157, 0.6);
}

@keyframes burstAnimation {
    0% {
        transform: scale(1);
        opacity: 1;
    }

    50% {
        transform: scale(1.3);
        opacity: 0.7;
    }

    100% {
        transform: scale(0);
        opacity: 0;
    }
}

/* Particle Effects */
.particle {
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--success-gradient);
    border-radius: var(--radius-full);
    pointer-events: none;
    animation: particleAnimation 0.8s ease-out forwards;
}

.particle.wrong {
    background: var(--danger-gradient);
}

@keyframes particleAnimation {
    0% {
        transform: translate(0, 0) scale(1);
        opacity: 1;
    }

    100% {
        transform: translate(var(--tx), var(--ty)) scale(0);
        opacity: 0;
    }
}

/* Answer Section */
.answer-section {
    padding: var(--spacing-lg);
    background: rgba(26, 22, 64, 0.9);
    backdrop-filter: blur(20px);
    border-top: 1px solid rgba(102, 126, 234, 0.2);
    z-index: 100;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.toggle-input-btn {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(102, 126, 234, 0.1);
    border: 1px solid rgba(102, 126, 234, 0.3);
    border-radius: var(--radius-sm);
    padding: 8px 12px;
    color: var(--text-secondary);
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    z-index: 10;
}

.toggle-input-btn:hover {
    background: rgba(102, 126, 234, 0.2);
    color: var(--text-primary);
    border-color: rgba(102, 126, 234, 0.5);
}

/* Desktop Options Mode */
.answer-section.show-options .input-wrapper {
    display: none;
}

.answer-section.show-options .options-wrapper {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
    width: 100%;
    max-width: 800px;
    margin-top: var(--spacing-xs);
}

.input-wrapper {
    max-width: 500px;
    margin: 0 auto;
    display: flex;
    gap: var(--spacing-sm);
    position: relative;
}

.answer-input {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(45, 37, 87, 0.6);
    border: 2px solid rgba(102, 126, 234, 0.3);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-family: 'Poppins', sans-serif;
    font-size: 1.2rem;
    font-weight: 500;
    outline: none;
    transition: all var(--transition-normal);
    backdrop-filter: blur(10px);
}

.answer-input::placeholder {
    color: var(--text-secondary);
}

.answer-input:focus {
    border-color: rgba(102, 126, 234, 0.6);
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.3);
    background: rgba(45, 37, 87, 0.8);
}

.submit-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--primary-gradient);
    border: none;
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

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

.submit-btn svg {
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn var(--transition-normal);
}

.modal.active {
    display: flex;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.modal-content {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    max-width: 400px;
    width: 90%;
    border: 2px solid rgba(102, 126, 234, 0.3);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    animation: slideUp var(--transition-slow);
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-content h2 {
    font-family: 'Outfit', sans-serif;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.new-high-score {
    font-family: 'Outfit', sans-serif;
    font-size: 1.8rem;
    color: #ffd93d;
    margin-bottom: var(--spacing-sm);
    display: none;
    /* Hidden by default */
    animation: bounce 1s infinite alternate;
    text-shadow: 0 0 10px rgba(255, 217, 61, 0.5);
}

@keyframes bounce {
    from {
        transform: translateY(0);
    }

    to {
        transform: translateY(-10px);
    }
}

.final-score {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
}

.final-score span {
    color: #ffd93d;
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    font-size: 2rem;
}

.restart-btn {
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--primary-gradient);
    border: none;
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-family: 'Poppins', sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
}

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

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

/* Options Wrapper (Hidden on Desktop) */
.options-wrapper {
    display: none;
}

.option-btn {
    padding: var(--spacing-md);
    background: rgba(45, 37, 87, 0.6);
    border: 2px solid rgba(102, 126, 234, 0.3);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: 'Outfit', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-fast);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 60px;
}

.option-btn:hover {
    background: rgba(45, 37, 87, 0.8);
    border-color: rgba(102, 126, 234, 0.6);
}

.option-btn:active {
    transform: scale(0.95);
    background: rgba(102, 126, 234, 0.4);
}

/* Responsive Design */
@media (max-width: 768px) {
    .toggle-input-btn {
        display: none;
    }

    .game-header {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .back-btn span {
        display: none;
    }

    .stat {
        font-size: 1rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .droplet {
        width: 60px;
        height: 60px;
        font-size: 1rem;
    }

    .answer-section {
        padding: var(--spacing-sm);
    }

    .answer-input {
        font-size: 1rem;
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .submit-btn {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .modal-content h2 {
        font-size: 2rem;
    }

    /* Mobile specific input/options toggling */
    .input-wrapper {
        display: none;
    }

    .options-wrapper {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: var(--spacing-xs);
        width: 100%;
        max-width: 100%;
        margin: 0 auto;
    }

    .option-btn {
        padding: var(--spacing-xs);
        min-height: 50px;
        font-size: 1.2rem;
        min-width: 0;
        /* allows text overflow handling if needed, prevents grid blowout */
    }
}

/* Animations for score and lives changes */
@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.2);
    }
}

.stat.animate {
    animation: pulse 0.3s ease;
}