/* Quiz App - Friendly & Encouraging Theme */

:root {
    --pink: #FFB6C1;
    --pink-dark: #FF69B4;
    --lavender: #E6E6FA;
    --lavender-dark: #9370DB;
    --mint: #98FB98;
    --mint-dark: #3CB371;
    --peach: #FFDAB9;
    --peach-dark: #FF8C00;
    --sky: #87CEEB;
    --sky-dark: #4169E1;
    
    --bg: #FFF5F8;
    --card-bg: #FFFFFF;
    --text: #4A4A6A;
    --text-light: #8888A8;
    
    --correct: #4ADE80;
    --correct-bg: #ECFDF5;
    --wrong: #F87171;
    --wrong-bg: #FEF2F2;
    
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
    --radius: 20px;
    --radius-sm: 12px;
}

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

body {
    font-family: 'Nunito', sans-serif;
    background: linear-gradient(135deg, var(--bg) 0%, var(--lavender) 100%);
    min-height: 100vh;
    color: var(--text);
    line-height: 1.6;
}

.app {
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    position: relative;
}

/* Screens */
.screen {
    display: none;
    animation: fadeIn 0.3s ease;
}

.screen.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ============ HOME SCREEN ============ */

.home-container {
    max-width: 500px;
    margin: 0 auto;
}

.hero {
    text-align: center;
    padding: 30px 10px 20px;
}

.hero h1 {
    font-size: 1.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--pink-dark), var(--lavender-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.subtitle {
    color: var(--text-light);
    font-size: 1rem;
}

/* Encouragement box - replaces scary stats */
.encouragement-box {
    background: linear-gradient(135deg, var(--mint), var(--sky));
    border-radius: var(--radius);
    padding: 20px;
    margin: 15px 0 25px;
    text-align: center;
}

.encouragement-message {
    color: #2D5A4A;
    font-size: 1.1rem;
    font-weight: 600;
}

/* Quick Quiz Buttons - THE MAIN FOCUS */
.quick-quiz-section {
    margin: 20px 0;
}

.quick-quiz-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.btn-quick {
    flex: 1;
    max-width: 140px;
    background: var(--card-bg);
    border: 3px solid var(--lavender);
    border-radius: var(--radius);
    padding: 20px 15px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    position: relative;
    font-family: inherit;
}

.btn-quick:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--lavender-dark);
}

.btn-quick:active {
    transform: translateY(-2px);
}

.btn-quick-popular {
    border-color: var(--pink-dark);
    background: linear-gradient(135deg, #FFF0F5, #FFF);
}

.popular-tag {
    position: absolute;
    top: -10px;
    background: var(--pink-dark);
    color: white;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 10px;
}

.quick-emoji {
    font-size: 1.8rem;
}

.quick-number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--lavender-dark);
}

.quick-label {
    font-size: 0.8rem;
    color: var(--text-light);
    font-weight: 600;
}

/* Secondary options */
.secondary-options {
    display: flex;
    justify-content: center;
    margin: 25px 0;
}

/* Buttons */
.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 24px;
    border: none;
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--pink-dark), var(--lavender-dark));
    color: white;
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--text);
    border: 2px solid var(--lavender);
}

.btn-tertiary {
    background: transparent;
    color: var(--text-light);
}

.btn-large {
    padding: 18px 32px;
    font-size: 1.1rem;
}

.badge {
    background: var(--wrong);
    color: white;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 0.85rem;
    margin-left: 8px;
}

.badge:empty, .badge[data-count="0"] {
    display: none;
}

/* Topic Filter - Collapsed */
.topic-filter-details {
    margin-top: 30px;
    text-align: center;
}

.topic-filter-summary {
    color: var(--text-light);
    cursor: pointer;
    font-size: 0.9rem;
    padding: 10px;
    list-style: none;
}

.topic-filter-summary::-webkit-details-marker {
    display: none;
}

.topic-filter-summary:hover {
    color: var(--text);
}

.topic-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    padding: 15px 0;
}

.topic-tag {
    padding: 8px 16px;
    border-radius: 20px;
    background: var(--card-bg);
    border: 2px solid var(--lavender);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
}

.topic-tag:hover {
    border-color: var(--lavender-dark);
}

.topic-tag.active {
    background: var(--lavender-dark);
    color: white;
    border-color: var(--lavender-dark);
}

/* Stats link - subtle */
.stats-link {
    display: block;
    width: 100%;
    margin-top: 30px;
    padding: 15px;
    background: transparent;
    border: none;
    color: var(--text-light);
    font-size: 0.85rem;
    cursor: pointer;
    font-family: inherit;
}

.stats-link:hover {
    color: var(--text);
}

/* ============ QUIZ SCREEN ============ */

.quiz-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    padding: 10px 0;
}

.btn-back {
    width: 40px;
    height: 40px;
    background: var(--card-bg);
    border: none;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-family: inherit;
}

.btn-back:hover {
    background: var(--lavender);
}

.progress-container {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 10px;
}

.progress-bar {
    flex: 1;
    height: 12px;
    background: var(--lavender);
    border-radius: 10px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--mint-dark), var(--sky-dark));
    border-radius: 10px;
    transition: width 0.4s ease;
    width: 0%;
}

.progress-text {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-light);
    min-width: 45px;
}

/* Streak display */
.streak-display {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 8px 12px;
    background: var(--card-bg);
    border-radius: 20px;
    box-shadow: var(--shadow);
}

.streak-fire {
    font-size: 1.2rem;
    opacity: 0.3;
    transition: all 0.3s ease;
}

.streak-fire.active {
    opacity: 1;
    animation: pulse 0.5s ease;
}

.streak-count {
    font-weight: 800;
    font-size: 1.1rem;
    color: var(--peach-dark);
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.3); }
}

/* Streak celebration banner */
.streak-banner {
    background: linear-gradient(135deg, var(--peach), var(--pink));
    color: #8B4513;
    text-align: center;
    padding: 12px;
    border-radius: var(--radius);
    margin-bottom: 15px;
    font-weight: 700;
    font-size: 1.1rem;
    display: none;
    animation: slideDown 0.3s ease;
}

.streak-banner.show {
    display: block;
}

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

/* Question Card */
.quiz-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 25px;
    align-items: start;
}

.quiz-left {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.quiz-right {
    position: sticky;
    top: 100px;
}

.question-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 25px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.topic-badge {
    display: inline-block;
    padding: 5px 14px;
    border-radius: 20px;
    background: var(--lavender);
    color: var(--lavender-dark);
    font-size: 0.8rem;
    font-weight: 700;
    margin-bottom: 15px;
}

.question-text {
    font-size: 1.15rem;
    font-weight: 700;
    line-height: 1.6;
    color: var(--text);
}

/* Options */
.options-container {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.option-btn {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 18px 20px;
    background: var(--card-bg);
    border: 3px solid var(--lavender);
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
    font-family: inherit;
}

.option-btn:hover:not(:disabled) {
    border-color: var(--lavender-dark);
    transform: translateX(5px);
}

.option-btn:disabled {
    cursor: default;
}

.option-letter {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--lavender);
    border-radius: 50%;
    font-weight: 800;
    color: var(--lavender-dark);
    flex-shrink: 0;
}

.option-text {
    flex: 1;
}

.option-btn.correct {
    background: var(--correct-bg);
    border-color: var(--correct);
    animation: correctPop 0.3s ease;
}

@keyframes correctPop {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.02); }
}

.option-btn.correct .option-letter {
    background: var(--correct);
    color: white;
}

.option-btn.wrong {
    background: var(--wrong-bg);
    border-color: var(--wrong);
}

.option-btn.wrong .option-letter {
    background: var(--wrong);
    color: white;
}

/* Feedback Area */
.feedback-area {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 30px;
    box-shadow: var(--shadow);
    min-height: 350px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.waiting-prompt {
    text-align: center;
    padding: 40px 20px;
}

.waiting-emoji {
    font-size: 3rem;
    margin-bottom: 15px;
    animation: bounce 1s ease infinite;
}

.waiting-text {
    font-size: 1.2rem;
    color: var(--text-light);
    font-weight: 600;
}

.feedback-card {
    text-align: center;
    animation: fadeIn 0.3s ease;
}

.feedback-icon {
    font-size: 3rem;
    margin-bottom: 10px;
}

.feedback-message {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.feedback-message.correct {
    color: var(--mint-dark);
}

.feedback-message.wrong {
    color: var(--text);
}

.correct-answer-box {
    background: var(--correct-bg);
    border-radius: var(--radius-sm);
    padding: 15px;
    margin: 15px 0;
}

.correct-answer-label {
    font-size: 0.85rem;
    color: var(--mint-dark);
    font-weight: 600;
}

.correct-answer-text {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    margin-top: 5px;
}

.explanation-box {
    background: var(--lavender);
    border-radius: var(--radius-sm);
    padding: 15px;
    margin: 15px 0;
    text-align: left;
}

.explanation-label {
    font-size: 0.8rem;
    color: var(--lavender-dark);
    font-weight: 700;
    margin-bottom: 5px;
}

.explanation-text {
    font-size: 0.95rem;
    color: var(--text);
    line-height: 1.5;
}

.learning-tip {
    font-size: 0.9rem;
    color: var(--mint-dark);
    font-weight: 600;
    margin-top: 15px;
    padding: 10px;
    background: var(--correct-bg);
    border-radius: var(--radius-sm);
}

.next-btn-container {
    margin-top: 20px;
}

/* ============ BREAK SCREEN ============ */

.break-content {
    text-align: center;
    padding: 40px 20px;
}

.break-emoji {
    font-size: 5rem;
    margin-bottom: 20px;
    animation: breathe 3s ease-in-out infinite;
}

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

.break-content h1 {
    font-size: 1.6rem;
    color: var(--lavender-dark);
    margin-bottom: 20px;
}

.break-stats {
    font-size: 1.1rem;
    color: var(--text);
    margin-bottom: 25px;
    line-height: 1.8;
}

.break-stats span {
    font-weight: 800;
    color: var(--mint-dark);
}

.break-tip {
    background: var(--peach);
    color: #8B4513;
    padding: 15px 20px;
    border-radius: var(--radius);
    margin: 20px 0;
    font-weight: 600;
}

.break-timer {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

/* ============ STATS SCREEN ============ */

.stats-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 25px;
}

.stats-header h1 {
    font-size: 1.4rem;
    flex: 1;
}

.stats-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 25px;
}

.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 18px 12px;
    text-align: center;
    box-shadow: var(--shadow);
}

.stat-number {
    font-size: 1.8rem;
    font-weight: 800;
}

.stat-total .stat-number { color: var(--lavender-dark); }
.stat-correct .stat-number { color: var(--mint-dark); }
.stat-streak .stat-number { color: var(--peach-dark); }

.stat-label {
    font-size: 0.75rem;
    color: var(--text-light);
    margin-top: 5px;
    font-weight: 600;
}

.topic-breakdown {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
}

.topic-breakdown h3 {
    margin-bottom: 15px;
    font-size: 1rem;
}

.topic-stat-row {
    display: flex;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid var(--lavender);
}

.topic-stat-row:last-child {
    border-bottom: none;
}

.topic-stat-name {
    flex: 1;
    font-weight: 600;
    font-size: 0.9rem;
}

.topic-stat-bar {
    flex: 1.5;
    height: 8px;
    background: var(--lavender);
    border-radius: 8px;
    overflow: hidden;
    margin: 0 12px;
}

.topic-stat-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--mint-dark), var(--sky-dark));
    border-radius: 8px;
}

.topic-stat-percent {
    font-weight: 700;
    color: var(--lavender-dark);
    min-width: 40px;
    text-align: right;
    font-size: 0.9rem;
}

.action-buttons {
    margin-top: 25px;
    display: flex;
    justify-content: center;
}

/* ============ COMPLETE SCREEN ============ */

.complete-content {
    text-align: center;
    padding: 40px 20px;
}

.celebration {
    font-size: 4rem;
    animation: bounce 0.6s ease infinite alternate;
}

@keyframes bounce {
    from { transform: translateY(0); }
    to { transform: translateY(-15px); }
}

.complete-content h1 {
    font-size: 1.8rem;
    margin: 20px 0;
    color: var(--lavender-dark);
}

.session-stats {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 25px;
    margin: 20px 0;
    box-shadow: var(--shadow);
}

.big-score {
    font-size: 3rem;
    font-weight: 800;
    color: var(--lavender-dark);
}

.big-score span:first-child {
    color: var(--mint-dark);
}

.score-label {
    color: var(--text-light);
    font-size: 1rem;
    margin-top: 5px;
}

.encouragement {
    font-size: 1.2rem;
    font-weight: 700;
    color: white;
    margin: 25px 0;
    padding: 20px;
    background: linear-gradient(135deg, var(--pink-dark), var(--lavender-dark));
    border-radius: var(--radius);
}

.complete-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 25px;
}

/* ============ MODAL ============ */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    z-index: 1000;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 30px;
    max-width: 350px;
    text-align: center;
}

.modal-content h2 {
    margin-bottom: 10px;
}

.modal-content p {
    color: var(--text-light);
    margin-bottom: 20px;
}

.modal-buttons {
    display: flex;
    gap: 10px;
}

.modal-buttons .btn {
    flex: 1;
}

/* ============ CONFETTI ============ */

#confetti-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    overflow: hidden;
}

.confetti {
    position: absolute;
    width: 10px;
    height: 10px;
    top: -10px;
    animation: confetti-fall 3s ease-out forwards;
}

@keyframes confetti-fall {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}

/* ============ RESPONSIVE ============ */

@media (max-width: 900px) {
    .app {
        max-width: 600px;
    }
    
    .quiz-content {
        grid-template-columns: 1fr;
    }
    
    .quiz-right {
        position: static;
    }
    
    .feedback-area {
        min-height: auto;
    }
}

@media (max-width: 500px) {
    .app {
        padding: 15px;
    }
    
    .hero h1 {
        font-size: 1.5rem;
    }
    
    .quick-quiz-buttons {
        gap: 8px;
    }
    
    .btn-quick {
        padding: 15px 10px;
    }
    
    .quick-number {
        font-size: 1.6rem;
    }
    
    .question-text {
        font-size: 1.05rem;
    }
    
    .stats-cards {
        grid-template-columns: 1fr;
        gap: 8px;
    }
}

/* Hidden utility */
.hidden {
    display: none !important;
}