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

html {
    height: 100%;
}

body {
    height: 100%;
    background-color: var(--bs-body-bg);
    color: var(--bs-body-color);
    font-family: "Comic Relief", system-ui;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 900px;
    width: 100%;
}

h1 {
    color: var(--bs-body-color);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
    font-weight: 700;
}

.lead {
    color: var(--bs-body-color);
    opacity: 0.8;
    margin-bottom: 20px;
}

.card {
    background-color: var(--bs-tertiary-bg);
    border: 2px solid var(--bs-border-color);
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.stats-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}

.stat-box {
    background-color: var(--bs-secondary-bg);
    border: 2px solid var(--bs-border-color);
    border-radius: 10px;
    padding: 15px;
    text-align: center;
    transition: all 0.3s;
    position: relative; /* For progress bar */
}

.stat-box:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--bs-body-color);
    opacity: 0.7;
    text-transform: uppercase;
    font-weight: 600;
    margin-bottom: 8px;
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--bs-body-color);
    line-height: 1;
}

.stat-unit {
    font-size: 0.8rem;
    color: var(--bs-body-color);
    opacity: 0.6;
    margin-top: 5px;
}

.difficulty-section {
    background-color: var(--bs-secondary-bg);
    padding: 15px;
    border-radius: 10px;
    border: 2px solid var(--bs-border-color);
}

.form-label {
    color: var(--bs-body-color);
    font-weight: 600;
    margin-bottom: 10px;
    display: block;
}

.btn-group .btn {
    border-color: var(--bs-border-color);
    color: var(--bs-body-color);
}

.btn-group .btn-check:checked + .btn {
    background-color: var(--bs-primary);
    border-color: var(--bs-primary);
    color: white;
}

.word-display-container {
    background-color: var(--bs-secondary-bg);
    padding: 30px;
    border-radius: 15px;
    border: 2px solid var(--bs-border-color);
    min-height: 150px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
}

.word-display {
    font-size: 3rem;
    font-weight: bold;
    color: var(--bs-body-color);
    text-align: center;
    margin-bottom: 15px;
    font-family: 'Courier New', monospace;
    transition: all 0.3s;
    word-break: break-word;
}

.word-display.correct {
    color: var(--bs-success);
    animation: correctPulse 0.3s ease;
}

.word-display.wrong {
    color: var(--bs-danger);
    animation: wrongShake 0.5s ease;
}

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

@keyframes wrongShake {
    0%, 100% {
        transform: translateX(0);
    }
    25% {
        transform: translateX(-10px);
    }
    75% {
        transform: translateX(10px);
    }
}

.input-container {
    position: relative;
}

.typing-input {
    font-size: 1.5rem;
    padding: 20px;
    text-align: center;
    background-color: var(--bs-card-bg);
    color: var(--bs-body-color);
    border: 3px solid var(--bs-border-color);
    border-radius: 10px;
    transition: all 0.3s;
    font-family: 'Courier New', monospace;
}

.typing-input:focus {
    outline: none;
    border-color: var(--bs-primary);
    box-shadow: 0 0 0 4px rgba(13, 110, 253, 0.1);
}

.typing-input.correct {
    border-color: var(--bs-success);
    background-color: rgba(25, 135, 84, 0.1);
}

.typing-input.wrong {
    border-color: var(--bs-danger);
    background-color: rgba(220, 53, 69, 0.1);
    animation: inputShake 0.3s ease;
}

@keyframes inputShake {
    0%, 100% {
        transform: translateX(0);
    }
    25% {
        transform: translateX(-5px);
    }
    75% {
        transform: translateX(5px);
    }
}

.input-feedback {
    margin-top: 10px;
    text-align: center;
    font-size: 0.9rem;
    min-height: 20px;
    color: var(--bs-body-color);
    opacity: 0.7;
}

.controls-container {
    margin-top: 20px;
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.btn {
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.results-container {
    background-color: var(--bs-secondary-bg);
    padding: 25px;
    border-radius: 10px;
    border: 2px solid var(--bs-border-color);
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

.result-item {
    background-color: var(--bs-card-bg);
    padding: 15px;
    border-radius: 8px;
    border: 2px solid var(--bs-border-color);
    text-align: center;
}

.result-label {
    font-size: 0.9rem;
    color: var(--bs-body-color);
    opacity: 0.7;
    margin-bottom: 8px;
    font-weight: 600;
}

.result-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--bs-primary);
}

/* Modal Styling */
.modal-content {
    background-color: var(--bs-body-bg);
    color: var(--bs-body-color);
    border: 1px solid var(--bs-border-color);
    border-radius: 1rem;
}

.modal-header {
    border-bottom: 1px solid var(--bs-border-color);
}

.modal-footer {
    border-top: 1px solid var(--bs-border-color);
}


/* Responsive */
@media (max-width: 768px) {
    .stats-container {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .word-display {
        font-size: 2rem;
    }
    
    .results-grid {
        grid-template-columns: 1fr;
    }
    
    h1 {
        font-size: 2rem;
    }
}

@media (max-width: 576px) {
    .stats-container {
        grid-template-columns: 1fr;
    }
    
    .word-display {
        font-size: 1.5rem;
    }
    
    .stat-value {
        font-size: 1.5rem;
    }
    
    .controls-container {
        flex-direction: column;
    }
    .btn {
        width: 100%;
    }
}