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

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #ec4899;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --bg: #0f172a;
    --bg-card: #1e293b;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --border: #334155;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

@keyframes shake {

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

    25% {
        transform: translateX(-10px);
    }

    75% {
        transform: translateX(10px);
    }
}

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

    100% {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}

.shake {
    animation: shake 0.5s ease;
}

/* Header */
header {
    background: linear-gradient(135deg, var(--bg-card), var(--bg));
    padding: 15px 20px;
    border-bottom: 2px solid var(--primary);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stats-bar {
    display: flex;
    gap: 15px;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background: var(--bg-card);
    border-radius: 25px;
    font-size: 0.9rem;
    border: 1px solid var(--border);
}

.stat-value {
    font-weight: 700;
    color: var(--primary);
}

/* Navigation */
nav {
    background: var(--bg-card);
    padding: 10px 20px;
    border-bottom: 1px solid var(--border);
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    gap: 8px;
    overflow-x: auto;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: transparent;
    border: none;
    border-radius: 12px;
    color: var(--text-muted);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    white-space: nowrap;
}

.nav-btn:hover {
    background: rgba(99, 102, 241, 0.1);
    color: var(--text);
}

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

/* Main */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 30px 20px;
}

.page {
    display: none;
    animation: fadeIn 0.5s ease;
}

.page.active {
    display: block;
}

/* Language Selector */
.lang-selector {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
    justify-content: center;
    flex-wrap: wrap;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px 30px;
    background: var(--bg-card);
    border: 3px solid var(--border);
    border-radius: 16px;
    color: var(--text);
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
}

.lang-btn:hover {
    transform: translateY(-3px);
}

.lang-btn.active {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
}

.lang-flag {
    font-size: 2rem;
}

/* Page Header */
.page-header {
    text-align: center;
    margin-bottom: 30px;
}

.page-title {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-subtitle {
    color: var(--text-muted);
}

/* Home Page */
.welcome-card {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 16px;
    padding: 40px;
    text-align: center;
    margin-bottom: 30px;
}

.welcome-title {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 10px;
}

.welcome-text {
    opacity: 0.9;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.feature-card {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 25px;
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all 0.3s;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: 0 10px 40px rgba(99, 102, 241, 0.2);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 15px;
    display: block;
}

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

.feature-desc {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Category Selector */
.category-selector {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 30px;
}

.category-btn {
    padding: 10px 20px;
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: 25px;
    color: var(--text);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.category-btn:hover {
    border-color: var(--primary);
}

.category-btn.active {
    background: var(--primary);
    border-color: var(--primary);
}

/* Flashcard */
.card-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 25px;
}

.card-progress {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 12px 20px;
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border);
}

.card-progress-bar {
    width: 200px;
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
}

.card-progress-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 4px;
    transition: width 0.3s;
}

.flashcard-wrapper {
    perspective: 1000px;
    width: 100%;
    max-width: 380px;
    height: 280px;
}

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

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

.card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 30px;
    text-align: center;
    border: 3px solid var(--border);
    background: var(--bg-card);
}

.card-front {
    border-color: var(--primary);
}

.card-back {
    transform: rotateY(180deg);
    border-color: var(--success);
    background: linear-gradient(145deg, var(--bg-card), var(--bg));
}

.card-word {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 10px;
}

.card-romanji {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.card-translation {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--success);
    margin-bottom: 10px;
}

.card-example {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-style: italic;
}

.card-hint {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 15px;
}

.speak-btn {
    position: absolute;
    top: 15px;
    right: 15px;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: var(--primary);
    border: none;
    color: white;
    font-size: 1.3rem;
    cursor: pointer;
    transition: all 0.3s;
}

.speak-btn:hover {
    transform: scale(1.1);
    background: var(--primary-dark);
}

.card-controls {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

.card-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    border: none;
}

.card-btn:hover {
    transform: translateY(-2px);
}

.card-btn.know {
    background: var(--success);
    color: white;
}

.card-btn.dont-know {
    background: var(--danger);
    color: white;
}

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

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

/* Speaking Page */
.speaking-container {
    max-width: 550px;
    margin: 0 auto;
}

.speaking-card {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 35px;
    text-align: center;
    border: 2px solid var(--border);
    margin-bottom: 25px;
}

.speaking-prompt {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: 15px;
}

.speaking-word {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 10px;
}

.speaking-translation {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.listen-btn {
    padding: 14px 30px;
    background: var(--primary);
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.listen-btn:hover {
    transform: scale(1.05);
}

.mic-container {
    text-align: center;
    margin: 30px 0;
}

.mic-btn {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border: none;
    color: white;
    font-size: 3rem;
    cursor: pointer;
    transition: all 0.3s;
}

.mic-btn:hover {
    transform: scale(1.05);
}

.mic-btn.recording {
    animation: pulse 1s infinite;
    box-shadow: 0 0 30px rgba(99, 102, 241, 0.5);
}

.mic-hint {
    margin-top: 15px;
    color: var(--text-muted);
}

.result-display {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 25px;
    text-align: center;
    border: 2px solid var(--border);
}

.result-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.result-text {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 15px;
    min-height: 40px;
}

.result-feedback {
    font-size: 1.1rem;
    font-weight: 600;
}

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

.result-feedback.incorrect {
    color: var(--danger);
}

.result-feedback.partial {
    color: var(--warning);
}

/* Games Page */
.games-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.game-card {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 30px;
    text-align: center;
    border: 2px solid var(--border);
    cursor: pointer;
    transition: all 0.3s;
}

.game-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: 0 10px 40px rgba(99, 102, 241, 0.2);
}

.game-icon {
    font-size: 3.5rem;
    margin-bottom: 15px;
    display: block;
}

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

.game-desc {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.game-area {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 30px;
    border: 1px solid var(--border);
    display: none;
}

.game-area.active {
    display: block;
}

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 15px;
}

.game-title {
    font-size: 1.5rem;
    font-weight: 700;
}

.game-stats {
    display: flex;
    gap: 20px;
}

.game-stat {
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
    font-size: 1.1rem;
}

.back-btn {
    padding: 10px 20px;
    background: var(--bg);
    border: 2px solid var(--border);
    border-radius: 10px;
    color: var(--text);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.back-btn:hover {
    border-color: var(--primary);
}

/* Quiz Game */
.quiz-question {
    text-align: center;
    margin-bottom: 30px;
}

.quiz-word {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 15px;
}

.quiz-hint {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.quiz-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    max-width: 600px;
    margin: 0 auto;
}

.quiz-option {
    padding: 20px;
    background: var(--bg);
    border: 2px solid var(--border);
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    color: var(--text);
}

.quiz-option:hover:not(:disabled) {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
}

.quiz-option.correct {
    border-color: var(--success);
    background: rgba(16, 185, 129, 0.2);
}

.quiz-option.wrong {
    border-color: var(--danger);
    background: rgba(239, 68, 68, 0.2);
}

.quiz-option:disabled {
    cursor: not-allowed;
}

/* Memory Game */
.memory-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    max-width: 450px;
    margin: 0 auto;
}

.memory-card {
    aspect-ratio: 1;
    background: var(--primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
    color: white;
    padding: 5px;
    text-align: center;
    word-break: break-word;
}

.memory-card.flipped,
.memory-card.matched {
    background: var(--bg);
    border: 2px solid var(--border);
    color: var(--text);
}

.memory-card.matched {
    border-color: var(--success);
    background: rgba(16, 185, 129, 0.1);
}

.memory-card:hover:not(.flipped):not(.matched) {
    transform: scale(1.05);
}

/* Matching Game */
.matching-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    max-width: 650px;
    margin: 0 auto;
}

.matching-column {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.matching-column-title {
    font-weight: 700;
    text-align: center;
    margin-bottom: 10px;
    color: var(--text-muted);
    font-size: 1.1rem;
}

.matching-item {
    padding: 16px 20px;
    background: var(--bg);
    border: 2px solid var(--border);
    border-radius: 10px;
    text-align: center;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 1.1rem;
}

.matching-item:hover:not(.matched):not(.selected) {
    border-color: var(--primary);
}

.matching-item.selected {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.2);
}

.matching-item.matched {
    border-color: var(--success);
    background: rgba(16, 185, 129, 0.2);
    cursor: default;
}

.matching-item.wrong {
    animation: shake 0.5s;
    border-color: var(--danger);
}

/* Scramble Game */
.scramble-container {
    text-align: center;
    max-width: 450px;
    margin: 0 auto;
}

.scramble-word {
    font-size: 2.8rem;
    font-weight: 800;
    letter-spacing: 12px;
    margin-bottom: 15px;
    color: var(--primary);
}

.scramble-hint {
    color: var(--text-muted);
    margin-bottom: 30px;
    font-size: 1.1rem;
}

.scramble-input {
    width: 100%;
    padding: 18px;
    background: var(--bg);
    border: 2px solid var(--border);
    border-radius: 12px;
    color: var(--text);
    font-size: 1.4rem;
    text-align: center;
    letter-spacing: 5px;
    margin-bottom: 20px;
    text-transform: uppercase;
}

.scramble-input:focus {
    outline: none;
    border-color: var(--primary);
}

.scramble-submit {
    padding: 14px 45px;
    background: var(--primary);
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.scramble-submit:hover {
    background: var(--primary-dark);
}

/* Game Complete */
.game-complete {
    text-align: center;
    padding: 40px 20px;
}

.complete-icon {
    font-size: 5rem;
    margin-bottom: 20px;
    display: block;
}

.complete-title {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.complete-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin: 25px 0;
    flex-wrap: wrap;
}

.complete-stat {
    text-align: center;
}

.complete-stat-value {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
}

.complete-stat-label {
    color: var(--text-muted);
}

.play-again-btn {
    padding: 15px 40px;
    background: var(--primary);
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    margin: 10px;
}

.play-again-btn:hover {
    background: var(--primary-dark);
}

/* Toast */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    padding: 15px 25px;
    background: var(--bg-card);
    border-radius: 12px;
    border-left: 4px solid var(--primary);
    display: flex;
    align-items: center;
    gap: 12px;
    animation: fadeIn 0.3s;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.toast.success {
    border-color: var(--success);
}

.toast.error {
    border-color: var(--danger);
}

.toast-icon {
    font-size: 1.3rem;
}

.toast-text {
    font-weight: 600;
}

/* Confetti */
.confetti {
    position: fixed;
    width: 10px;
    height: 10px;
    top: -20px;
    pointer-events: none;
    z-index: 2000;
    animation: confetti-fall 3s ease-out forwards;
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        justify-content: center;
        text-align: center;
    }

    .stats-bar {
        justify-content: center;
    }

    .card-word,
    .speaking-word,
    .quiz-word {
        font-size: 2.2rem;
    }

    .quiz-options {
        grid-template-columns: 1fr;
    }

    .memory-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .matching-container {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .scramble-word {
        font-size: 2rem;
        letter-spacing: 8px;
    }
}