:root {
    --bg-primary: #0f0f1a;
    --bg-secondary: #1a1a2e;
    --bg-card: #16213e;
    --gold: #d4af37;
    --gold-light: #f0d060;
    --white: #ffffff;
    --text-muted: #a0a0b0;
    --accent-red: #e74c3c;
    --accent-green: #27ae60;
    --radius: 12px;
    --shadow: 0 4px 20px rgba(0,0,0,0.3);
}

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

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--white);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Landing Page */
.hero {
    text-align: center;
    padding: 80px 24px 60px;
    background: linear-gradient(180deg, #1a1a2e 0%, #0f0f1a 100%);
}

.hero h1 {
    font-size: 3.2rem;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 16px;
    letter-spacing: -1px;
}

.hero h1 span {
    color: var(--gold);
}

.hero .tagline {
    font-size: 1.3rem;
    color: var(--text-muted);
    margin-bottom: 12px;
    font-weight: 300;
}

.hero .description {
    font-size: 1.05rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

.cta-btn {
    display: inline-block;
    padding: 16px 48px;
    background: linear-gradient(135deg, var(--gold), var(--gold-light));
    color: #1a1a2e;
    font-size: 1.1rem;
    font-weight: 700;
    text-decoration: none;
    border-radius: 50px;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 15px rgba(212,175,55,0.3);
}

.cta-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(212,175,55,0.5);
}

/* Lesson Grid */
.lessons-section {
    padding: 60px 24px 80px;
}

.lessons-section h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 40px;
    color: var(--white);
}

.lessons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.lesson-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 28px;
    border: 1px solid rgba(212,175,55,0.15);
    transition: transform 0.2s, border-color 0.2s;
    text-decoration: none;
    color: var(--white);
    display: block;
}

.lesson-card:hover {
    transform: translateY(-4px);
    border-color: var(--gold);
}

.lesson-card .lesson-number {
    font-size: 0.85rem;
    color: var(--gold);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 8px;
}

.lesson-card h3 {
    font-size: 1.25rem;
    margin-bottom: 10px;
    font-weight: 600;
}

.lesson-card p {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* Lesson Page */
.lesson-header {
    padding: 50px 24px 30px;
    background: var(--bg-secondary);
    border-bottom: 1px solid rgba(212,175,55,0.2);
}

.lesson-header .back-link {
    color: var(--gold);
    text-decoration: none;
    font-size: 0.9rem;
    display: inline-block;
    margin-bottom: 16px;
}

.lesson-header h1 {
    font-size: 2.2rem;
    margin-bottom: 12px;
}

.lesson-meta {
    background: rgba(212,175,55,0.08);
    border: 1px solid rgba(212,175,55,0.2);
    border-radius: var(--radius);
    padding: 20px;
    margin-top: 20px;
}

.lesson-meta h4 {
    color: var(--gold);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.lesson-meta p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.lesson-content {
    padding: 40px 24px 60px;
}

.char-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.char-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
    border: 1px solid rgba(255,255,255,0.05);
    transition: border-color 0.2s;
}

.char-card:hover {
    border-color: var(--gold);
}

.char-card .character {
    font-size: 3.5rem;
    display: block;
    margin-bottom: 8px;
    font-weight: 300;
}

.char-card .romaji {
    font-size: 1.1rem;
    color: var(--gold);
    margin-bottom: 8px;
    font-weight: 600;
}

.char-card .hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.play-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: linear-gradient(135deg, var(--gold), var(--gold-light));
    color: #1a1a2e;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    transition: transform 0.1s;
}

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

.play-btn:active {
    transform: scale(0.95);
}

/* Practice Section */
.practice-section {
    margin-top: 50px;
    padding-top: 40px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.practice-section h2 {
    font-size: 1.6rem;
    margin-bottom: 24px;
    color: var(--gold-light);
}

.quiz-question {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
    border: 1px solid rgba(255,255,255,0.05);
}

.quiz-question .q-text {
    font-size: 1.1rem;
    margin-bottom: 16px;
    font-weight: 500;
}

.quiz-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.quiz-option {
    padding: 12px 16px;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
    font-size: 1rem;
}

.quiz-option:hover {
    background: rgba(212,175,55,0.1);
    border-color: var(--gold);
}

.quiz-option.correct {
    background: rgba(39,174,96,0.2);
    border-color: var(--accent-green);
    color: #2ecc71;
}

.quiz-option.wrong {
    background: rgba(231,76,60,0.2);
    border-color: var(--accent-red);
    color: #e74c3c;
}

.feedback {
    margin-top: 12px;
    padding: 10px;
    border-radius: 8px;
    font-size: 0.9rem;
    display: none;
}

.feedback.show { display: block; }
.feedback.correct { background: rgba(39,174,96,0.1); color: #2ecc71; }
.feedback.wrong { background: rgba(231,76,60,0.1); color: #e74c3c; }

/* Footer */
.footer {
    text-align: center;
    padding: 40px 24px;
    border-top: 1px solid rgba(255,255,255,0.05);
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.2rem; }
    .char-grid { grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); }
    .quiz-options { grid-template-columns: 1fr; }
    .lessons-grid { grid-template-columns: 1fr; }
}