:root {
    --primary-color: #FF6B6B;
    --secondary-color: #4ECDC4;
    --accent-color: #FFE66D;
    --dark-color: #2C3E50;
    --light-color: #F7F9F9;
    --success-color: #2ECC71;
    --error-color: #E74C3C;
    --font-main: 'Fredoka', sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    font-family: var(--font-main);
    background-color: var(--light-color);
    margin: 0;
    padding: 0;
    color: var(--dark-color);
    display: flex;
    justify-content: center;
    min-height: 100vh;
}

#app {
    width: 100%;
    max-width: 800px;
    background: white;
    min-height: 100vh;
    box-shadow: 0 0 20px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
}

.main-header {
    background-color: var(--secondary-color);
    color: white;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 5px solid rgba(0,0,0,0.1);
}

.main-header h1 {
    margin: 0;
    font-size: 1.5rem;
}

.score-display {
    font-size: 1.2rem;
    font-weight: bold;
    background: rgba(255,255,255,0.2);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#content-area {
    flex: 1;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* Home Page */
.subject-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    width: 100%;
}

.subject-card {
    background: white;
    border: 3px solid var(--secondary-color);
    border-radius: 15px;
    padding: 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.subject-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px rgba(0,0,0,0.1);
    background-color: #f0fffe;
}

.subject-card h3 {
    color: var(--dark-color);
    margin-bottom: 0.5rem;
}

/* Theory Page */
.theory-container {
    width: 100%;
}

.theory-content {
    font-size: 1.2rem;
    line-height: 1.6;
    background: #fdfdfd;
    padding: 2rem;
    border-radius: 10px;
    border: 2px dashed var(--secondary-color);
    margin-bottom: 2rem;
}

.number-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
    margin-top: 20px;
}

.number-item {
    background: var(--accent-color);
    padding: 10px;
    border-radius: 8px;
    text-align: center;
    font-weight: bold;
    font-size: 1.1rem;
}

/* Buttons */
.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 1rem 2rem;
    font-size: 1.5rem;
    border-radius: 50px;
    cursor: pointer;
    font-family: var(--font-main);
    box-shadow: 0 5px 0 #d43f3f;
    transition: transform 0.1s;
}

.btn-primary:active {
    transform: translateY(5px);
    box-shadow: none;
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    font-size: 1.2rem;
    border-radius: 10px;
    cursor: pointer;
    margin-top: 1rem;
}

.btn-back {
    background: none;
    border: 2px solid #ccc;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    margin-bottom: 1rem;
    font-family: var(--font-main);
    color: #777;
}

/* Quiz Page */
.quiz-container {
    width: 100%;
    max-width: 600px;
}

.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.progress-bar-container {
    flex: 1;
    height: 15px;
    background: #eee;
    margin: 0 1rem;
    border-radius: 10px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--secondary-color);
    width: 0%;
    transition: width 0.3s;
}

.question-area {
    text-align: center;
    margin-bottom: 2rem;
}

.options-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.option-btn {
    background: white;
    border: 2px solid var(--secondary-color);
    padding: 1rem;
    font-size: 1.2rem;
    border-radius: 15px;
    cursor: pointer;
    font-family: var(--font-main);
    transition: all 0.2s;
}

.option-btn:hover {
    background: #e3fcf9;
}

.option-btn.correct {
    background-color: var(--success-color);
    color: white;
    border-color: var(--success-color);
    animation: pop 0.3s;
}

.option-btn.incorrect {
    background-color: var(--error-color);
    color: white;
    border-color: var(--error-color);
    animation: shake 0.4s;
}

/* Animations */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

@keyframes pop {
    50% { transform: scale(1.1); }
}

.pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(255, 107, 107, 0.4); }
    70% { box-shadow: 0 0 0 20px rgba(255, 107, 107, 0); }
    100% { box-shadow: 0 0 0 0 rgba(255, 107, 107, 0); }
}

.hidden {
    display: none !important;
}

/* Result Page */
.result-container {
    text-align: center;
}

.final-stars {
    font-size: 4rem;
    margin: 2rem 0;
    animation: pop 0.5s;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: white;
    padding: 2rem;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    width: 90%;
    max-width: 400px;
    animation: pop 0.3s;
}

.modal-content h2 {
    color: var(--primary-color);
}

.modal-content input {
    width: 100%;
    padding: 1rem;
    margin: 1rem 0;
    border: 2px solid #eee;
    border-radius: 10px;
    font-size: 1.2rem;
    font-family: var(--font-main);
}

/* Quiz Text Input */
.text-input-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.answer-input {
    padding: 1rem;
    font-size: 1.5rem;
    border: 3px solid var(--secondary-color);
    border-radius: 15px;
    text-align: center;
    font-family: var(--font-main);
}