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

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #0a0e27 0%, #1a1d3a 50%, #2a2d4a 100%);
    min-height: 100vh;
    padding: 15px;
    color: #333;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.container {
    max-width: 700px;
    margin: 0 auto;
    padding-bottom: 40px;
    position: relative;
    z-index: 1;
}

/* Header */
header {
    text-align: center;
    color: white;
    padding: 30px 0 35px;
    margin-bottom: 25px;
}

header h1 {
    font-size: 3.5em;
    margin-bottom: 10px;
    font-weight: 800;
    background: linear-gradient(135deg, #60a5fa 0%, #a78bfa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -1px;
    text-shadow: none;
    filter: drop-shadow(0 2px 8px rgba(96, 165, 250, 0.3));
}

.tagline {
    font-size: 1.15em;
    opacity: 0.85;
    font-weight: 500;
    color: #e0e7ff;
    letter-spacing: 0.5px;
}

/* Start Screen */
.start-screen {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-radius: 24px;
    padding: 45px 35px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(255, 255, 255, 0.1);
    animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

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

.challenge-badge {
    text-align: center;
    margin-bottom: 35px;
    padding: 30px 25px;
    background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    border-radius: 20px;
    color: white;
    box-shadow: 0 10px 40px rgba(59, 130, 246, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
}

.challenge-badge::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.challenge-icon {
    font-size: 4.5em;
    margin-bottom: 12px;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.2));
    position: relative;
    z-index: 1;
}

.challenge-title {
    font-size: 2em;
    font-weight: 700;
    margin-bottom: 10px;
    position: relative;
    z-index: 1;
    letter-spacing: 0.5px;
}

.challenge-date {
    font-size: 1.15em;
    opacity: 0.95;
    font-weight: 500;
    position: relative;
    z-index: 1;
}

/* Streak Display */
.streak-display, .streak-display-end {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    padding: 20px 25px;
    background: linear-gradient(135deg, #f59e0b 0%, #f97316 100%);
    border-radius: 16px;
    margin-bottom: 25px;
    box-shadow: 0 8px 25px rgba(245, 158, 11, 0.3);
    animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.streak-icon {
    font-size: 3em;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.streak-text {
    text-align: left;
    color: white;
}

.streak-current {
    font-size: 1.5em;
    font-weight: 700;
    margin-bottom: 4px;
}

.streak-longest {
    font-size: 0.95em;
    opacity: 0.9;
    font-weight: 500;
}

/* Global Stats */
.global-stats {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-radius: 18px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.global-stats h3 {
    color: #1e40af;
    font-size: 1.3em;
    font-weight: 700;
    margin-bottom: 20px;
    text-align: center;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
}

.stat-item {
    text-align: center;
    padding: 15px;
    background: linear-gradient(135deg, #f0f9ff 0%, #f5f3ff 100%);
    border-radius: 12px;
    border: 1px solid rgba(59, 130, 246, 0.1);
}

.stat-value {
    font-size: 1.8em;
    font-weight: 800;
    color: #3b82f6;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.85em;
    color: #64748b;
    font-weight: 500;
}

@media (max-width: 600px) {
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .stat-item {
        padding: 12px;
    }
}

.challenge-rules {
    margin-bottom: 25px;
}

.challenge-rules h3 {
    color: #1e40af;
    font-size: 1.5em;
    font-weight: 700;
    margin-bottom: 18px;
    text-align: center;
}

.challenge-rules ul {
    list-style: none;
    padding: 0;
}

.challenge-rules li {
    padding: 14px 18px;
    margin: 10px 0;
    background: linear-gradient(135deg, #f0f9ff 0%, #f5f3ff 100%);
    border-radius: 12px;
    font-size: 1.05em;
    color: #1e293b;
    border: 1px solid rgba(59, 130, 246, 0.1);
    font-weight: 500;
}

.game-description {
    padding: 24px;
    background: linear-gradient(135deg, #eff6ff 0%, #f5f3ff 100%);
    border-radius: 16px;
    font-size: 1.05em;
    line-height: 1.8;
    color: #1e293b;
    text-align: center;
    border: 1px solid rgba(59, 130, 246, 0.15);
    font-weight: 500;
}

.game-description strong {
    color: #3b82f6;
    font-weight: 700;
}

.btn-start {
    width: 100%;
    padding: 22px;
    background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    color: white;
    border: none;
    border-radius: 16px;
    font-size: 1.35em;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
}

.btn-start::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn-start:hover::before {
    width: 300px;
    height: 300px;
}

.btn-start:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(59, 130, 246, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.btn-start:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
}

.today-stats {
    margin: 20px 0;
    padding: 20px;
    background: #eff6ff;
    border-radius: 10px;
    border-left: 4px solid #3b82f6;
}

.today-stats h4 {
    color: #3b82f6;
    margin-bottom: 10px;
}

.today-stats p {
    color: #666;
    margin: 5px 0;
    font-size: 1.05em;
}

/* Progress Bar */
.progress-bar {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    padding: 24px;
    border-radius: 20px;
    margin-bottom: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.progress-label {
    text-align: center;
    font-size: 1.15em;
    font-weight: 700;
    color: #1e40af;
    margin-bottom: 15px;
}

.progress-track {
    width: 100%;
    height: 14px;
    background: #e0e7ff;
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 12px;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #3b82f6 0%, #8b5cf6 100%);
    border-radius: 12px;
    transition: width 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    width: 0%;
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.5);
}

.difficulty-indicator {
    text-align: center;
    font-size: 0.95em;
    color: #64748b;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-weight: 600;
}

/* Game Screen */
.game-screen {
    animation: fadeIn 0.3s ease-in;
}

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

/* Sentence Display */
.sentence-container {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-radius: 24px;
    padding: 40px 35px;
    margin-bottom: 30px;
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.25);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.instruction {
    text-align: center;
    font-size: 0.95em;
    color: #64748b;
    margin-bottom: 25px;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 700;
}

.sentence {
    font-size: 1.5em;
    line-height: 1.9;
    color: #1e293b;
    text-align: center;
    padding: 15px;
    font-weight: 600;
}

.blank {
    display: inline-block;
    min-width: 140px;
    padding: 0 15px;
    border-bottom: 4px solid transparent;
    font-weight: 800;
    color: #3b82f6;
    font-size: 1.05em;
    background: linear-gradient(to bottom, transparent calc(100% - 4px), #3b82f6 calc(100% - 4px), #8b5cf6 100%);
    background-size: 100% 100%;
    animation: blankPulse 2s ease-in-out infinite;
}

@keyframes blankPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* Definition Choices */
.definition-instruction {
    text-align: center;
    font-size: 1.05em;
    font-weight: 700;
    color: #e0e7ff;
    margin-bottom: 20px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    letter-spacing: 0.5px;
}

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

.choice-btn {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(59, 130, 246, 0.2);
    border-radius: 18px;
    padding: 24px 22px;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    font-size: 1.05em;
    text-align: left;
    line-height: 1.6;
    color: #1e293b;
    font-weight: 500;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    position: relative;
}

.choice-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 18px;
    padding: 2px;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.4s;
}

.choice-btn:hover:not(:disabled) {
    background: rgba(255, 255, 255, 1);
    border-color: #3b82f6;
    transform: translateX(8px) scale(1.02);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.3);
}

.choice-btn:hover:not(:disabled)::before {
    opacity: 1;
}

.choice-btn:disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

.choice-btn.correct {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
    border-color: #10b981;
    animation: correctPulse 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 10px 30px rgba(16, 185, 129, 0.3);
}

.choice-btn.incorrect {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    border-color: #ef4444;
    animation: shake 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 10px 30px rgba(239, 68, 68, 0.3);
}

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

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

/* Result Screen */
.result-screen {
    animation: fadeIn 0.4s ease-in;
}

.result-header {
    text-align: center;
    margin-bottom: 25px;
}

.result-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 15px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3em;
    font-weight: bold;
}

.result-icon.correct {
    background: #d1fae5;
    color: #10b981;
}

.result-icon.incorrect {
    background: #fee2e2;
    color: #ef4444;
}

.result-title {
    font-size: 2em;
    font-weight: bold;
    color: white;
}

.result-title.correct {
    color: #d1fae5;
}

.result-title.incorrect {
    color: #fee2e2;
}

/* Reveal Box */
.reveal-box {
    background: white;
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 20px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    text-align: center;
}

.reveal-label {
    font-size: 0.9em;
    color: #666;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 10px;
}

.reveal-word {
    font-size: 2.5em;
    font-weight: bold;
    color: #3b82f6;
    letter-spacing: 2px;
}

/* Explanation Box */
.explanation-box {
    background: white;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.explanation-title {
    font-size: 0.9em;
    color: #666;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 10px;
}

.explanation-text {
    font-size: 1.2em;
    line-height: 1.7;
    color: #333;
}

/* Definition Box */
.definition-box {
    background: white;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.definition-label {
    font-size: 0.9em;
    color: #666;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 10px;
}

.definition-text {
    font-size: 1.1em;
    line-height: 1.6;
    color: #333;
}

/* Buttons */
.btn-next {
    width: 100%;
    padding: 18px;
    background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1.2em;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}

.btn-next:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(59, 130, 246, 0.6);
    background: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
}

.btn-primary {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1.1em;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
    background: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
}

/* End Screen */
.end-screen {
    background: white;
    border-radius: 15px;
    padding: 40px 30px;
    text-align: center;
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
    animation: fadeIn 0.4s ease-in;
}

.end-icon {
    font-size: 5em;
    margin-bottom: 15px;
}

.end-screen h2 {
    color: #3b82f6;
    font-size: 2.2em;
    margin-bottom: 30px;
}

.final-level {
    margin: 30px 0;
    padding: 25px;
    background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    border-radius: 12px;
    color: white;
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.3);
}

.final-level-label {
    font-size: 1em;
    opacity: 0.9;
    margin-bottom: 10px;
}

.final-level-value {
    font-size: 3em;
    font-weight: bold;
}

.performance-message {
    font-size: 1.3em;
    color: #333;
    margin: 25px 0;
    font-weight: 500;
    line-height: 1.5;
}

.share-container {
    margin: 25px 0;
}

.btn-share {
    width: 100%;
    padding: 15px;
    background: #10b981;
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1.1em;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.btn-share:hover {
    background: #059669;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

.social-share-buttons {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    flex-wrap: wrap;
}

.btn-social {
    flex: 1;
    min-width: 120px;
    padding: 12px 16px;
    border: none;
    border-radius: 10px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: white;
}

.btn-social .social-icon {
    font-size: 1.2em;
    font-weight: bold;
}

.btn-social.twitter {
    background: #000000;
}

.btn-social.twitter:hover {
    background: #333333;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.btn-social.facebook {
    background: #1877f2;
}

.btn-social.facebook:hover {
    background: #0d65d9;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(24, 119, 242, 0.3);
}

.btn-social.copy {
    background: #6b7280;
}

.btn-social.copy:hover {
    background: #4b5563;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(107, 114, 128, 0.3);
}

.next-challenge {
    margin: 30px 0;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
}

.next-label {
    font-size: 0.9em;
    color: #666;
    margin-bottom: 10px;
}

.countdown {
    font-size: 2em;
    font-weight: bold;
    color: #3b82f6;
    font-family: 'Courier New', monospace;
}

.end-actions {
    margin-top: 20px;
}

/* Instructions Button */
.btn-instructions {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: white;
    border: 3px solid #3b82f6;
    color: #3b82f6;
    font-size: 1.5em;
    font-weight: bold;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    transition: all 0.3s;
}

.btn-instructions:hover {
    transform: scale(1.1);
    background: #eff6ff;
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.3);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.7);
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-content {
    background: white;
    border-radius: 15px;
    padding: 30px;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 2em;
    background: none;
    border: none;
    cursor: pointer;
    color: #666;
    line-height: 1;
    padding: 0;
    width: 35px;
    height: 35px;
}

.modal-close:hover {
    color: #333;
}

.modal-content h2 {
    color: #3b82f6;
    margin-bottom: 20px;
    font-size: 2em;
}

.modal-content h3 {
    color: #3b82f6;
    margin: 20px 0 10px;
    font-size: 1.3em;
}

.instructions-content {
    text-align: left;
}

.instructions-content p {
    margin: 10px 0;
    line-height: 1.6;
    color: #444;
}

.instructions-content ul {
    margin: 10px 0;
    padding-left: 20px;
}

.instructions-content li {
    margin: 8px 0;
    color: #444;
    line-height: 1.5;
}

.example-box {
    background: #f8f9fa;
    border-left: 4px solid #3b82f6;
    padding: 15px;
    margin: 15px 0;
    border-radius: 5px;
}

.example-box p {
    margin: 8px 0;
}

/* Word Reveal */
.word-reveal-container {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-radius: 18px;
    padding: 30px 25px;
    margin: 25px 0;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.word-reveal-container h3 {
    color: #1e40af;
    font-size: 1.5em;
    font-weight: 700;
    margin-bottom: 20px;
    text-align: center;
}

.word-reveal-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.word-reveal-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    padding: 18px;
    border-radius: 14px;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    border: 2px solid transparent;
}

.word-reveal-item.easy {
    background: linear-gradient(135deg, #dbeafe 0%, #e0f2fe 100%);
    border-color: rgba(59, 130, 246, 0.2);
}

.word-reveal-item.medium {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border-color: rgba(245, 158, 11, 0.2);
}

.word-reveal-item.hard {
    background: linear-gradient(135deg, #fce7f3 0%, #fbcfe8 100%);
    border-color: rgba(236, 72, 153, 0.2);
}

.word-reveal-item:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.word-reveal-number {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.95em;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.word-reveal-item.easy .word-reveal-number {
    color: #3b82f6;
    border: 2px solid #3b82f6;
}

.word-reveal-item.medium .word-reveal-number {
    color: #f59e0b;
    border: 2px solid #f59e0b;
}

.word-reveal-item.hard .word-reveal-number {
    color: #ec4899;
    border: 2px solid #ec4899;
}

.word-reveal-content {
    flex: 1;
    min-width: 0;
}

.word-reveal-word {
    font-size: 1.25em;
    font-weight: 700;
    margin-bottom: 6px;
    color: #1e293b;
    letter-spacing: 0.3px;
}

.word-reveal-definition {
    font-size: 0.95em;
    line-height: 1.6;
    color: #475569;
    font-weight: 500;
}

/* Responsive */
@media (max-width: 480px) {
    header h1 {
        font-size: 2.2em;
    }

    .sentence {
        font-size: 1.1em;
    }

    .choice-btn {
        padding: 15px;
        font-size: 0.95em;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .final-score-value {
        font-size: 3em;
    }

    .reveal-word {
        font-size: 2em;
    }

    .word-reveal-container {
        padding: 20px 15px;
    }

    .word-reveal-item {
        padding: 14px;
        gap: 12px;
    }

    .word-reveal-number {
        width: 28px;
        height: 28px;
        font-size: 0.9em;
    }

    .word-reveal-word {
        font-size: 1.1em;
    }

    .word-reveal-definition {
        font-size: 0.9em;
    }
}