:root {
    --primary-green: #2E8B57;
    --secondary-green: #3CB371;
    --dark-green: #1E5C3A;
    --light-green: #90EE90;
    --lighter-green: #E8F5E9;
    --accent-gold: #FFD700;
    --white: #FFFFFF;
    --black: #333333;
    --gray: #757575;
    --light-gray: #f5f5f5;
    --transition: all 0.3s ease;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: 'Open Sans', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-gray);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    color: var(--black);
    line-height: 1.6;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    flex: 1;
}
header {
    text-align: center;
    margin-bottom: 30px;
    color: var(--white);
    background-color: var(--primary-green);
    padding: 2rem 1rem;
    border-radius: 0 0 15px 15px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}
.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
}
.stats-bar {
    background: var(--white);
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 30px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
}
.stat-item {
    text-align: center;
    padding: 15px;
    background: linear-gradient(135deg, var(--secondary-green) 0%, var(--primary-green) 100%);
    border-radius: 10px;
    color: var(--white);
}
.stat-number {
    font-size: 2rem;
    font-weight: bold;
    display: block;
}
.stat-label {
    font-size: 0.9rem;
    margin-top: 5px;
}
.game-area {
    background: var(--white);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
    text-align: center;
    margin-bottom: 30px;
}
.lesson-timer {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary-green);
    margin-bottom: 15px;
    background: var(--lighter-green);
    padding: 10px;
    border-radius: 10px;
    display: inline-block;
}
.timer-control {
    background: linear-gradient(135deg, var(--light-green) 0%, var(--secondary-green) 100%);
    color: var(--white);
    border: none;
    padding: 8px 16px;
    border-radius: 25px;
    cursor: pointer;
    font-size: 1rem;
    margin-left: 10px;
    transition: var(--transition);
    font-weight: 600;
}
.timer-control:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}
.verb-display {
    background: linear-gradient(135deg, var(--secondary-green) 0%, var(--primary-green) 100%);
    color: var(--white);
    padding: 30px;
    border-radius: 15px;
    margin-bottom: 30px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}
.polish-verb {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 10px;
}
.verb-type {
    font-size: 1.1rem;
    opacity: 0.9;
}
.input-section {
    margin-bottom: 30px;
}
.verb-inputs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}
.input-group {
    display: flex;
    flex-direction: column;
}
.input-label {
    font-weight: bold;
    margin-bottom: 8px;
    color: var(--gray);
}
.verb-input {
    padding: 15px;
    border: 2px solid #ddd;
    border-radius: 10px;
    font-size: 1.1rem;
    transition: var(--transition);
}
.verb-input:focus {
    outline: none;
    border-color: var(--primary-green);
    box-shadow: 0 0 10px rgba(46, 139, 87, 0.3);
}
.verb-input.correct {
    border-color: var(--primary-green);
    background-color: var(--lighter-green);
}
.verb-input.incorrect {
    border-color: #f44336;
    background-color: #fff8f8;
}
.verb-input:disabled {
    background-color: #f5f5f5;
    cursor: not-allowed;
    opacity: 0.7;
}
.action-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}
.btn {
    padding: 15px 30px;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: bold;
    transition: var(--transition);
    min-width: 120px;
}
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}
.btn-primary {
    background: linear-gradient(135deg, var(--primary-green) 0%, var(--dark-green) 100%);
    color: var(--white);
}
.btn-secondary {
    background: linear-gradient(135deg, var(--lighter-green) 0%, var(--light-green) 100%);
    color: var(--black);
}
.btn-hint {
    background: linear-gradient(135deg, var(--lighter-green) 0%, #a8edea 100%);
    color: var(--black);
}
.btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
}
.feedback {
    margin-top: 20px;
    padding: 15px;
    border-radius: 10px;
    font-weight: bold;
    min-height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.feedback.correct {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}
.feedback.incorrect {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f1b0b7;
}
.feedback.hint {
    background-color: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}
.progress-bar {
    background: #e0e0e0;
    border-radius: 25px;
    height: 10px;
    margin-bottom: 20px;
    overflow: hidden;
}
.progress-fill {
    background: linear-gradient(135deg, var(--secondary-green) 0%, var(--primary-green) 100%);
    height: 100%;
    transition: width 0.5s ease;
    border-radius: 25px;
}
.leaderboard {
    background: var(--white);
    border-radius: 15px;
    padding: 25px;
    margin-top: 20px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}
.leaderboard h3 {
    text-align: center;
    margin-bottom: 20px;
    color: var(--primary-green);
}
.score-item {
    display: flex;
    justify-content: space-between;
    padding: 10px;
    border-bottom: 1px solid #eee;
}
.hidden {
    display: none;
}
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    h1 {
        font-size: 2rem;
    }
    .polish-verb {
        font-size: 2rem;
    }
    .game-area {
        padding: 20px;
    }
    .verb-inputs {
        grid-template-columns: 1fr;
    }
    .action-buttons {
        flex-direction: column;
        align-items: center;
    }
    .btn {
        width: 100%;
        max-width: 300px;
    }
    .lesson-timer {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    .timer-control {
        margin-left: 0;
        margin-top: 10px;
    }
}
.celebration {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 1000;
}
.confetti {
    position: absolute;
    width: 10px;
    height: 10px;
    background: var(--accent-gold);
    animation: confetti-fall 3s linear infinite;
}
@keyframes confetti-fall {
    to {
        transform: translateY(100vh) rotate(360deg);
    }
}