:root {
    /* Color Palette - Ghibli Inspired */
    --bg-cream: #fbfaf5;
    --bg-paper: #f0efe9;
    --text-main: #4a4a4a;
    --text-light: #7a7a7a;

    --primary-green: #557c55;
    --primary-green-light: #7a9c7a;
    --accent-blue: #87ceeb;
    --accent-red: #d66c6c;
    --accent-orange: #f4a460;

    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    --card-radius: 16px;
    --btn-radius: 24px;

    --font-main: 'M PLUS Rounded 1c', sans-serif;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-cream);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
}

#app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Navigation */
#main-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background: white;
    border-radius: var(--card-radius);
    box-shadow: var(--card-shadow);
    margin-bottom: 30px;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-green);
}

.nav-links {
    display: flex;
    gap: 25px;
    list-style: none;
}

.nav-links li {
    cursor: pointer;
    color: var(--text-light);
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links li:hover,
.nav-links li.active {
    color: var(--primary-green);
}

/* Hero Section */
.hero-section {
    text-align: center;
    padding: 60px 20px;
}

.hero-section h1 {
    font-size: 2.5rem;
    color: var(--primary-green);
    margin-bottom: 15px;
}

.hero-section p {
    font-size: 1.2rem;
    color: var(--text-light);
}

/* Views */
.view {
    opacity: 1;
    transition: opacity 0.3s ease;
}

.view.hidden {
    display: none;
    opacity: 0;
}

/* Levels Grid */
.levels-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    padding: 20px 0;
}

.level-card {
    background: white;
    padding: 30px;
    border-radius: var(--card-radius);
    box-shadow: var(--card-shadow);
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
}

.level-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.level-card.locked {
    opacity: 0.6;
    cursor: not-allowed;
}

.level-card.locked::after {
    content: '🔒';
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 1.5rem;
}

.level-header {
    margin-bottom: 15px;
}

.level-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 5px;
}

.level-subtitle {
    font-size: 0.9rem;
    color: var(--text-light);
}

.progress-bar-container {
    height: 8px;
    background-color: #eee;
    border-radius: 4px;
    margin-top: 20px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background-color: var(--primary-green);
    border-radius: 4px;
    width: 0%;
    transition: width 0.5s ease;
}

/* Footer */
footer {
    text-align: center;
    padding: 40px 0;
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    background-color: var(--primary-green);
    color: white;
    border: none;
    border-radius: var(--btn-radius);
    font-family: var(--font-main);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.btn:hover {
    background-color: var(--primary-green-light);
    transform: scale(1.05);
}

.btn-secondary {
    background-color: transparent;
    border: 2px solid var(--primary-green);
    color: var(--primary-green);
}

.btn-secondary:hover {
    background-color: var(--primary-green);
    color: white;
}

.btn-danger {
    background: #e74c3c;
    color: white;
}

.btn-warning {
    background: #f39c12;
    color: white;
}

.btn-success {
    background: #27ae60;
    color: white;
}

.btn-icon {
    padding: 8px 12px;
    font-size: 1.2rem;
    background: transparent;
    border: 1px solid #ddd;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-section h1 {
        font-size: 2rem;
    }

    .nav-links {
        gap: 15px;
        font-size: 0.9rem;
    }
}

/* Progression Dashboard */
.progress-dashboard {
    max-width: 800px;
    margin: 0 auto;
}

.mascot-container {
    background: white;
    border-radius: var(--card-radius);
    padding: 40px;
    text-align: center;
    box-shadow: var(--card-shadow);
    margin-bottom: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-image: linear-gradient(to bottom, #fff, #f8fff8);
}

.mascot {
    font-size: 6rem;
    margin-bottom: 20px;
    animation: bounce 2s infinite ease-in-out;
}

@keyframes bounce {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

.mascot-info h2 {
    color: var(--primary-green);
    margin-bottom: 5px;
}

.xp-bar-container {
    width: 100%;
    max-width: 400px;
    height: 12px;
    background-color: #eee;
    border-radius: 6px;
    margin: 15px 0;
    overflow: hidden;
}

.xp-bar {
    height: 100%;
    background-color: var(--accent-orange);
    border-radius: 6px;
    transition: width 0.5s ease;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.stat-card {
    background: white;
    padding: 20px;
    border-radius: var(--card-radius);
    box-shadow: var(--card-shadow);
    text-align: center;
}

.stat-card h3 {
    font-size: 1rem;
    color: var(--text-light);
    margin-bottom: 10px;
}

.stat-card p {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
}

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
}

.achievement-item {
    background: white;
    padding: 15px;
    border-radius: 12px;
    text-align: center;
    border: 2px solid #eee;
    opacity: 0.5;
    transition: all 0.3s ease;
}

.achievement-item.unlocked {
    opacity: 1;
    border-color: var(--accent-blue);
    background-color: #f0f8ff;
}

.achievement-icon {
    font-size: 2rem;
    margin-bottom: 5px;
}

.achievement-title {
    font-size: 0.9rem;
    font-weight: 600;
}

/* ============ Animations ============ */

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

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

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }

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

.fade-in {
    animation: fadeIn 0.3s ease-out forwards;
}

.slide-in {
    animation: slideIn 0.3s ease-out forwards;
}

/* ============ Modal & Onboarding ============ */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: white;
    border-radius: var(--card-radius);
    padding: 40px;
    max-width: 500px;
    width: 90%;
    text-align: center;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.onboarding-slides {
    min-height: 200px;
}

.slide {
    display: none;
}

.slide.active {
    display: block;
    animation: fadeIn 0.4s ease-out;
}

.slide-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.slide h2 {
    margin-bottom: 15px;
    color: var(--primary-green);
}

.onboarding-nav {
    margin-top: 30px;
}

.dots {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #ddd;
    cursor: pointer;
    transition: background 0.3s;
}

.dot.active {
    background: var(--primary-green);
}

/* ============ SRS Review ============ */

.review-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
}

.srs-stats-bar {
    background: var(--bg-paper);
    padding: 15px;
    border-radius: var(--card-radius);
    text-align: center;
    margin-bottom: 30px;
    font-size: 1.2rem;
}

.srs-card {
    background: white;
    border-radius: var(--card-radius);
    box-shadow: var(--card-shadow);
    padding: 40px;
    text-align: center;
    min-height: 300px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.srs-card .card-content {
    font-size: 3rem;
    margin-bottom: 30px;
}

.srs-card-back .card-content {
    font-size: 1.5rem;
    color: var(--text-light);
}

.srs-rating-buttons {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 20px;
}

.review-progress {
    text-align: center;
    margin-top: 20px;
    color: var(--text-light);
}

/* ============ Favorites ============ */

.favorites-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

.favorite-card {
    display: flex;
    align-items: center;
    gap: 15px;
    background: white;
    padding: 15px 20px;
    border-radius: var(--card-radius);
    margin-bottom: 10px;
    box-shadow: var(--card-shadow);
}

.favorite-content {
    flex: 1;
    display: flex;
    gap: 20px;
}

.favorite-front {
    font-size: 1.5rem;
    font-weight: 600;
}

.favorite-back {
    color: var(--text-light);
    display: flex;
    align-items: center;
}

/* ============ Empty States ============ */

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-light);
}

.empty-state.hidden {
    display: none;
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.empty-state h3 {
    margin-bottom: 10px;
    color: var(--text-main);
}

/* ============ Speak Button ============ */

.speak-btn {
    cursor: pointer;
    transition: transform 0.2s;
}

.speak-btn:hover {
    transform: scale(1.1);
}

/* ============ Example Box (for lessons) ============ */

.example-box {
    background: var(--bg-paper);
    border-left: 4px solid var(--primary-green);
    padding: 15px;
    margin: 15px 0;
    border-radius: 0 8px 8px 0;
}

.example-box p {
    margin: 5px 0;
}

/* ============ Flashcards ============ */

.flashcard-deck {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
}

.flashcard-container {
    perspective: 1000px;
    cursor: pointer;
}

.flashcard {
    position: relative;
    width: 100%;
    height: 120px;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.flashcard.flipped {
    transform: rotateY(180deg);
}

.flashcard-front,
.flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: white;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    padding: 15px;
}

.flashcard-back {
    transform: rotateY(180deg);
    background: var(--bg-paper);
}

.flashcard-hint {
    font-size: 0.8rem;
    color: var(--text-light);
    margin-top: 10px;
}

/* ============ Mini Quiz ============ */

.mini-quiz-container {
    background: var(--bg-paper);
    padding: 20px;
    border-radius: var(--card-radius);
    margin: 15px 0;
}

.mini-quiz-options {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 15px;
}

.mini-quiz-btn {
    padding: 10px 20px;
    border: 2px solid #ddd;
    background: white;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
}

.mini-quiz-btn:hover:not(:disabled) {
    border-color: var(--primary-green);
}

.mini-quiz-btn.correct {
    background: #d4edda;
    border-color: #28a745;
}

.mini-quiz-btn.wrong {
    background: #f8d7da;
    border-color: #dc3545;
}

.feedback-msg {
    margin-top: 15px;
    font-weight: 600;
}

/* ============ Matching Game ============ */

.matching-game {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: 10px;
    margin: 20px 0;
}

.match-card {
    background: white;
    padding: 20px;
    text-align: center;
    font-size: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    cursor: pointer;
    transition: all 0.3s;
    border: 2px solid transparent;
}

.match-card:hover {
    transform: scale(1.05);
}

.match-card.selected {
    border-color: var(--accent-blue);
    background: #e3f2fd;
}

.match-card.matched {
    background: #d4edda;
    border-color: #28a745;
    opacity: 0.7;
    pointer-events: none;
}

.ghibli-intro {
    background: linear-gradient(to right, #f8fff8, #fff);
    padding: 15px;
    border-radius: var(--card-radius);
    margin-bottom: 20px;
    font-size: 1.5rem;
    align-items: center;
    gap: 10px;
}

.spirit-icon {
    font-size: 1.5rem;
}

/* ============ Listening Exercise ============ */

.listening-exercise {
    max-width: 600px;
    margin: 0 auto;
}

.listening-question {
    text-align: center;
    padding: 20px;
}

.play-audio-btn {
    font-size: 1.5rem;
    padding: 20px 40px;
    margin-bottom: 30px;
}

.listening-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin-bottom: 20px;
}

.listen-opt-btn {
    font-size: 2rem;
    padding: 30px;
    background: white;
    border: 2px solid #ddd;
    border-radius: var(--card-radius);
    cursor: pointer;
    transition: all 0.3s;
}

.listen-opt-btn:hover:not(:disabled) {
    border-color: var(--primary-green);
    transform: scale(1.05);
}

.listen-feedback {
    font-size: 1.2rem;
    font-weight: 600;
    margin: 20px 0;
    min-height: 30px;
}

.listen-progress {
    color: var(--text-light);
}

/* ============ Drawing Exercise ============ */

.drawing-exercise {
    max-width: 500px;
    margin: 0 auto;
}

.drawing-question {
    text-align: center;
    padding: 20px;
}

.char-reference {
    margin-bottom: 20px;
}

.big-char {
    font-size: 5rem;
    color: var(--primary-green);
    display: block;
    margin-bottom: 10px;
}

#draw-canvas {
    border: 2px solid #ddd;
    border-radius: 12px;
    touch-action: none;
    cursor: crosshair;
    display: block;
    margin: 0 auto 20px;
}

.canvas-controls {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-bottom: 15px;
}

.draw-progress {
    color: var(--text-light);
}

/* ============ Chart with TTS ============ */

.chart-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 10px;
    padding: 20px;
}

.chart-item {
    background: white;
    padding: 15px;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--card-shadow);
    cursor: pointer;
    transition: all 0.3s;
}

.chart-item:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.chart-char {
    font-size: 2rem;
    display: block;
    margin-bottom: 5px;
}

.chart-romaji {
    font-size: 0.9rem;
    color: var(--text-light);
}

.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-light);
}

/* ============ Auth Modal & Forms ============ */

.nav-auth {
    display: flex;
    align-items: center;
    gap: 10px;
}

.btn-auth {
    padding: 8px 20px;
    font-size: 0.9rem;
    background: var(--primary-green);
}

.btn-auth.logged-in {
    background: transparent;
    border: 2px solid var(--primary-green);
    color: var(--primary-green);
    display: flex;
    align-items: center;
    gap: 8px;
}

.user-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--primary-green);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 700;
}

.auth-modal-content {
    max-width: 400px;
    position: relative;
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-light);
    transition: color 0.3s;
}

.modal-close:hover {
    color: var(--text-main);
}

.auth-form h2 {
    margin-bottom: 10px;
    color: var(--primary-green);
}

.auth-subtitle {
    color: var(--text-light);
    margin-bottom: 25px;
    font-size: 0.95rem;
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-main);
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #ddd;
    border-radius: 12px;
    font-size: 1rem;
    font-family: var(--font-main);
    transition: border-color 0.3s, box-shadow 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-green);
    box-shadow: 0 0 0 3px rgba(85, 124, 85, 0.1);
}

.form-group input::placeholder {
    color: #aaa;
}

.auth-error {
    background: #f8d7da;
    color: #721c24;
    padding: 12px 15px;
    border-radius: 8px;
    margin-bottom: 15px;
    font-size: 0.9rem;
    text-align: left;
}

.auth-error.hidden {
    display: none;
}

.btn-primary {
    background: var(--primary-green);
    color: white;
}

.btn-full {
    width: 100%;
    padding: 14px;
    font-size: 1.05rem;
}

.auth-switch {
    margin-top: 20px;
    color: var(--text-light);
    font-size: 0.9rem;
}

.auth-switch a {
    color: var(--primary-green);
    text-decoration: none;
    font-weight: 600;
}

.auth-switch a:hover {
    text-decoration: underline;
}

/* ============ Sync Status Indicator ============ */

.sync-indicator {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 0.8rem;
    color: var(--text-light);
    margin-left: 10px;
}

.sync-indicator.syncing {
    color: var(--accent-orange);
}

.sync-indicator.synced {
    color: #28a745;
}

.sync-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: currentColor;
}

.sync-indicator.syncing .sync-dot {
    animation: pulse 1s infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.3;
    }
}

/* ============ User Dropdown Menu ============ */

.user-dropdown {
    position: relative;
}

.user-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 10px;
    background: white;
    border-radius: var(--card-radius);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    min-width: 200px;
    z-index: 100;
    display: none;
}

.user-menu.show {
    display: block;
    animation: fadeIn 0.2s ease-out;
}

.user-menu-header {
    padding: 15px;
    border-bottom: 1px solid #eee;
}

.user-menu-header strong {
    display: block;
    margin-bottom: 3px;
}

.user-menu-header small {
    color: var(--text-light);
}

.user-menu-item {
    padding: 12px 15px;
    cursor: pointer;
    transition: background 0.2s;
    display: flex;
    align-items: center;
    gap: 10px;
}

.user-menu-item:hover {
    background: var(--bg-paper);
}

.user-menu-item:last-child {
    border-top: 1px solid #eee;
    color: var(--accent-red);
}

/* ============ Responsive Auth ============ */

@media (max-width: 768px) {
    #main-nav {
        flex-wrap: wrap;
        gap: 15px;
    }

    .nav-auth {
        order: 2;
        width: 100%;
        justify-content: center;
    }

    .nav-links {
        order: 3;
        width: 100%;
        justify-content: center;
    }

    .logo {
        order: 1;
    }

    .auth-modal-content {
        padding: 30px 20px;
    }
}