:root {
    --bg-color: #0b0c10;
    --neon-blue: #00f3ff;
    --neon-pink: #ff00ea;
    --neon-green: #00ff66;
    --neon-yellow: #ffea00;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.2);
}

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

body {
    background-color: var(--bg-color);
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(0, 243, 255, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 85% 30%, rgba(255, 0, 234, 0.08) 0%, transparent 50%);
    color: #fff;
    font-family: 'Rajdhani', sans-serif;
    min-height: 100vh;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: 3rem;
    text-transform: uppercase;
    letter-spacing: 3px;
    text-align: center;
    margin-bottom: 1.5rem;
    background: linear-gradient(90deg, var(--neon-blue), var(--neon-pink), var(--neon-yellow));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 10px rgba(255, 0, 234, 0.5));
    animation: pulse 3s infinite alternate;
}

@keyframes pulse {
    0% { filter: drop-shadow(0 0 5px rgba(0, 243, 255, 0.5)); }
    100% { filter: drop-shadow(0 0 20px rgba(255, 0, 234, 0.8)); }
}

/* Navigation Bar */
nav {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    justify-content: center;
    z-index: 100;
}

.nav-btn {
    background: transparent;
    color: var(--neon-blue);
    border: 2px solid var(--neon-blue);
    padding: 1rem 2rem;
    font-family: 'Orbitron', sans-serif;
    font-size: 1.1rem;
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.3s;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav-btn:hover, .nav-btn.active {
    background: var(--neon-blue);
    color: var(--bg-color);
    box-shadow: 0 0 20px var(--neon-blue);
}

/* Section Management */
.section {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: center;
    animation: fadeIn 0.5s ease-in-out;
}

.section.active {
    display: flex;
}

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

/* Practice Section (Chart) */
.chart-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    width: 100%;
    max-width: 1400px;
    margin-bottom: 3rem;
}

.section-title {
    font-family: 'Orbitron', sans-serif;
    color: var(--neon-blue);
    font-size: 1.5rem;
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--neon-blue);
    display: inline-block;
    padding-bottom: 0.2rem;
    text-shadow: 0 0 8px var(--neon-blue);
}

.grid-vowels, .grid-consonants {
    display: grid;
    gap: 1rem;
    justify-content: start;
}

.grid-vowels {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.grid-consonants {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

/* Phoneme Cards */
.phoneme-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1rem 0.8rem;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.phoneme-card::before {
    content: '';
    position: absolute;
    top: 0; left: -100%;
    width: 100%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: 0.5s;
    pointer-events: none;
}

.phoneme-card:hover::before {
    left: 100%;
}

.phoneme-card:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 0 15px var(--neon-pink);
    border-color: var(--neon-pink);
    z-index: 10;
}

.phoneme-card.vowel:hover {
    box-shadow: 0 0 15px var(--neon-blue);
    border-color: var(--neon-blue);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 0.5rem;
    width: 100%;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 0.5rem;
}

.phoneme-symbol {
    font-size: 2rem;
    font-weight: 700;
    color: #fff;
    text-shadow: 0 0 10px rgba(255,255,255,0.5);
    line-height: 1.1;
}

.phoneme-burmese {
    font-size: 1.1rem;
    color: #ff4d4d;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-shadow: 0 0 5px rgba(255, 77, 77, 0.4);
}

.example-list {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    width: 100%;
}

.example-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.95rem;
}

.ex-word-container {
    display: flex;
    align-items: center;
    gap: 5px;
}

.ex-word {
    font-weight: 600;
    color: #fff;
    cursor: pointer;
    transition: color 0.2s;
}

.ex-word:hover {
    color: var(--neon-yellow);
}

.word-audio {
    font-size: 0.8rem;
    cursor: pointer;
    filter: drop-shadow(0 0 3px var(--neon-blue));
    transition: transform 0.2s;
}

.word-audio:hover {
    transform: scale(1.2);
}

.ex-ipa {
    color: var(--neon-green);
    font-weight: 500;
    text-shadow: 0 0 5px rgba(0, 255, 102, 0.3);
    font-size: 0.9rem;
}

/* Mastery Section */
.mastery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 1.5rem;
    width: 100%;
    max-width: 1200px;
}

.mastery-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 15px;
    padding: 1.5rem;
    backdrop-filter: blur(10px);
    text-align: left;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.mastery-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 0 15px var(--neon-green);
    border-color: var(--neon-green);
}

.mastery-title {
    font-family: 'Orbitron', sans-serif;
    color: var(--neon-pink);
    font-size: 1.4rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--neon-pink);
    padding-bottom: 0.5rem;
    text-shadow: 0 0 5px rgba(255, 0, 234, 0.3);
}

.mastery-text {
    color: #ccc;
    font-size: 1.05rem;
    line-height: 1.6;
    margin-bottom: 1.2rem;
}

.mastery-text strong {
    color: var(--neon-yellow);
}

/* Fixed Stress Marks - Inline */
.stress-main { 
    display: inline;
    color: var(--neon-yellow); 
    font-weight: bold; 
    font-size: 1.2em; 
}
.stress-sec { 
    display: inline;
    color: var(--neon-blue); 
    font-weight: bold; 
    font-size: 1.1em; 
}

.mastery-example {
    background: rgba(0,0,0,0.4);
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    border-left: 3px solid var(--neon-green);
    position: relative;
}

.ex-header-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 0.3rem;
}

.ex-word-mastery { font-size: 1.2rem; font-weight: bold; color: #fff; }
.ex-ipa-mastery { display: block; font-family: monospace; color: var(--neon-green); font-size: 1.1rem; margin-top: 0.2rem; }
.ex-sentence { display: flex; font-style: italic; color: #aaa; font-size: 1rem; margin-top: 0.5rem; align-items: center; gap: 8px; flex-wrap: wrap; }

.mastery-audio {
    cursor: pointer;
    font-size: 1.2rem;
    filter: drop-shadow(0 0 5px var(--neon-blue));
    transition: transform 0.2s;
}

.mastery-audio:hover {
    transform: scale(1.2);
}

/* Quiz & Game Sections */
.interactive-section {
    width: 100%;
    max-width: 800px;
    background: var(--glass-bg);
    border: 2px solid var(--neon-green);
    border-radius: 20px;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 0 20px rgba(0, 255, 102, 0.2);
    backdrop-filter: blur(10px);
    margin-top: 1rem;
}

.interactive-title {
    font-family: 'Orbitron', sans-serif;
    color: var(--neon-green);
    font-size: 2rem;
    margin-bottom: 1rem;
    text-shadow: 0 0 10px var(--neon-green);
}

.interactive-word {
    font-size: 3rem;
    font-weight: 700;
    color: #fff;
    margin: 1rem 0;
    letter-spacing: 2px;
    text-shadow: 0 0 15px rgba(255, 255, 255, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.instructions {
    color: #aaa;
    margin-bottom: 2rem;
    font-size: 1.2rem;
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.option-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid var(--glass-border);
    color: white;
    padding: 1rem;
    font-size: 1.2rem;
    font-family: 'Orbitron', sans-serif;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s;
}

.option-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: var(--neon-yellow);
    box-shadow: 0 0 10px var(--neon-yellow);
}

.option-btn.correct {
    background: rgba(0, 255, 102, 0.3);
    border-color: var(--neon-green);
    box-shadow: 0 0 20px var(--neon-green);
}

.option-btn.wrong {
    background: rgba(255, 0, 0, 0.3);
    border-color: red;
    box-shadow: 0 0 20px red;
}

.score-display {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.2rem;
    color: var(--neon-pink);
    margin-top: 1rem;
}

.action-btn {
    background: transparent;
    color: var(--neon-green);
    border: 2px solid var(--neon-green);
    padding: 1rem 3rem;
    font-family: 'Orbitron', sans-serif;
    font-size: 1.2rem;
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.3s;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.action-btn:hover {
    background: var(--neon-green);
    color: var(--bg-color);
    box-shadow: 0 0 20px var(--neon-green);
}

.action-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.audio-icon {
    display: inline-block;
    font-size: 1.8rem;
    cursor: pointer;
    transition: transform 0.2s;
    filter: drop-shadow(0 0 5px var(--neon-blue));
}

.audio-icon:hover {
    transform: scale(1.2);
    filter: drop-shadow(0 0 15px var(--neon-blue));
}

/* Menu Specifics */
#quiz-menu .options-grid, #game-menu .options-grid {
    grid-template-columns: repeat(2, 1fr);
    max-width: 600px;
    margin: 0 auto;
}

.back-btn {
    background: transparent;
    color: var(--neon-pink);
    border: 2px solid var(--neon-pink);
    padding: 0.8rem 2rem;
    font-family: 'Orbitron', sans-serif;
    font-size: 1rem;
    border-radius: 20px;
    cursor: pointer;
    margin-top: 1.5rem;
    transition: all 0.3s;
    text-transform: uppercase;
}

.back-btn:hover {
    background: var(--neon-pink);
    color: var(--bg-color);
    box-shadow: 0 0 15px var(--neon-pink);
}