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

:root {
    --primary-color: #6366f1;
    --secondary-color: #ec4899;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --dark-bg: #0f172a;
    --light-bg: #f8fafc;
    --card-bg: #ffffff;
    --text-dark: #1e293b;
    --text-light: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    color: var(--text-dark);
}

.container {
    width: 100%;
    max-width: 600px;
}

.game-card {
    background: var(--card-bg);
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 30px 20px;
    text-align: center;
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.subtitle {
    font-size: 1rem;
    opacity: 0.95;
    font-weight: 500;
}

.game-content {
    padding: 30px 20px;
}

/* Feedback Section */
.feedback-section {
    margin-bottom: 25px;
    min-height: 80px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.message {
    font-size: 1.2rem;
    font-weight: 600;
    text-align: center;
    min-height: 30px;
    animation: fadeIn 0.3s ease-out;
}

.message.correct {
    color: var(--success-color);
}

.message.too-high {
    color: var(--warning-color);
}

.message.too-low {
    color: var(--warning-color);
}

.hint {
    font-size: 0.9rem;
    text-align: center;
    color: var(--text-light);
    margin-top: 8px;
    font-style: italic;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* Stats Section */
.stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 25px;
}

.stat-box {
    background: linear-gradient(135deg, #f0f9ff 0%, #f5f3ff 100%);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 15px;
    text-align: center;
    transition: var(--transition);
}

.stat-box:hover {
    border-color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.1);
}

.stat-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 5px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* Input Section */
.input-section {
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
}

.guess-input {
    flex: 1;
    padding: 15px;
    font-size: 1.1rem;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    transition: var(--transition);
    font-weight: 600;
    color: var(--text-dark);
}

.guess-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.guess-input::placeholder {
    color: var(--text-light);
}

.guess-btn {
    padding: 15px 30px;
    font-size: 1rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.guess-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(99, 102, 241, 0.4);
}

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

.guess-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Previous Guesses */
.previous-guesses {
    background: #f8fafc;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 25px;
}

.previous-guesses h3 {
    font-size: 1rem;
    color: var(--text-dark);
    margin-bottom: 12px;
    font-weight: 700;
}

.guesses-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    min-height: 40px;
    align-items: center;
}

.guess-item {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 8px 12px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
    animation: popIn 0.3s ease-out;
}

.guess-item.too-high {
    border-color: var(--warning-color);
    background: #fef3c7;
    color: #92400e;
}

.guess-item.too-low {
    border-color: var(--warning-color);
    background: #fef3c7;
    color: #92400e;
}

@keyframes popIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.guesses-list:empty::after {
    content: "No guesses yet. Make your first guess!";
    color: var(--text-light);
    font-style: italic;
}

/* Game Over Section */
.game-over-section {
    background: linear-gradient(135deg, #fef3c7 0%, #fecaca 100%);
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    margin-bottom: 25px;
    border: 2px solid var(--warning-color);
    animation: slideUp 0.4s ease-out;
}

.game-over-section.hidden {
    display: none;
}

.game-over-message {
    font-size: 1.3rem;
    font-weight: 700;
    color: #92400e;
    margin-bottom: 20px;
    line-height: 1.6;
}

.play-again-btn {
    padding: 12px 30px;
    font-size: 1rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--success-color) 0%, #059669 100%);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.play-again-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(16, 185, 129, 0.3);
}

/* Difficulty Section */
.difficulty-section {
    background: #f8fafc;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
}

.difficulty-section h3 {
    font-size: 1rem;
    color: var(--text-dark);
    margin-bottom: 12px;
    font-weight: 700;
}

.difficulty-buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.difficulty-btn {
    padding: 12px;
    font-size: 1rem;
    font-weight: 600;
    background: white;
    color: var(--text-dark);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.difficulty-btn small {
    display: block;
    font-size: 0.8rem;
    color: white;
    margin-top: 3px;
}

.difficulty-btn:hover {
    border-color: var(--primary-color);
    background: #f0f9ff;
}

.difficulty-btn.active {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    border-color: transparent;
}

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

/* Footer */
.footer {
    background: #f8fafc;
    border-top: 1px solid var(--border-color);
    padding: 20px;
    text-align: center;
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 600px) {
    .header h1 {
        font-size: 2rem;
    }

    .game-content {
        padding: 20px 15px;
    }

    .input-section {
        flex-direction: column;
    }

    .guess-btn {
        width: 100%;
    }

    .stats {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .difficulty-buttons {
        grid-template-columns: 1fr;
    }

    .difficulty-btn {
        padding: 15px;
    }

    .message {
        font-size: 1.1rem;
    }

    .game-over-message {
        font-size: 1.1rem;
    }
}

@media (max-width: 400px) {
    .header h1 {
        font-size: 1.7rem;
    }

    .subtitle {
        font-size: 0.9rem;
    }

    .header {
        padding: 20px 15px;
    }

    .game-content {
        padding: 15px 10px;
    }

    .guesses-list {
        gap: 5px;
    }

    .guess-item {
        padding: 6px 10px;
        font-size: 0.85rem;
    }
}