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

:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    --background: #f8fafc;
    --surface: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-lg: rgba(0, 0, 0, 0.15);
    --radius: 16px;
    --radius-sm: 8px;
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
}

body {
    font-family: 'Figtree', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0;
}

.container {
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: var(--spacing-md) 0;
}

header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

header h1,
#spellingPracticeTitle {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.game-content header {
    margin-bottom: var(--spacing-md);
}

.header-top {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    position: relative;
}

.config-btn {
    position: absolute;
    right: 0;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: none;
    background: var(--surface);
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    box-shadow: 0 2px 4px var(--shadow);
}

.config-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: scale(1.1);
    box-shadow: 0 4px 8px var(--shadow-lg);
}

.config-icon {
    display: block;
}

.config-panel {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--surface);
    border-radius: var(--radius);
    padding: 0;
    box-shadow: 0 8px 32px var(--shadow-lg);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow: hidden;
    z-index: 1000;
    animation: slideDown 0.3s ease-out;
}

.config-panel-content {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.config-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 2px solid var(--border);
}

.config-header h3 {
    margin: 0;
    font-size: 1.5rem;
    color: var(--text-primary);
}

.config-close {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.config-close:hover {
    background: var(--background);
    color: var(--text-primary);
}

.config-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
}

.config-section {
    margin-bottom: var(--spacing-xl);
}

.config-section:last-child {
    margin-bottom: 0;
}

.config-section h4 {
    margin: 0 0 var(--spacing-md) 0;
    font-size: 1.2rem;
    color: var(--text-primary);
}

.config-toggle-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    font-weight: 500;
    color: var(--text-primary);
}

.config-toggle-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.add-word-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.config-input {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    background: var(--background);
    color: var(--text-primary);
    font-family: inherit;
    transition: border-color 0.2s;
}

.config-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.add-word-status {
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    min-height: 20px;
}

.add-word-status.success {
    background: rgba(16, 185, 129, 0.1);
    color: #10b981;
}

.add-word-status.error {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

.add-word-status.info {
    background: rgba(59, 130, 246, 0.1);
    color: #3b82f6;
}

.btn-back {
    position: absolute;
    left: 0;
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.9rem;
    background: var(--surface);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: all 0.2s;
    font-weight: 500;
}

.btn-back:hover {
    background: var(--surface);
    color: var(--text-primary);
    border-color: var(--text-secondary);
    transform: translateY(-1px);
}

/* Mode Selection Screen */
.mode-selection {
    text-align: center;
    padding: var(--spacing-xl) 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
    min-height: 100vh;
}

.mode-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.mode-card {
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    padding: var(--spacing-xl);
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.mode-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--shadow-lg);
    border-color: var(--primary-color);
}

.mode-card:active {
    transform: translateY(-2px);
}

.mode-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-sm);
}

.mode-card h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.mode-card p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.5;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.score-display {
    display: flex;
    gap: var(--spacing-xl);
    justify-content: center;
    align-items: center;
    margin-top: var(--spacing-md);
    flex-wrap: wrap;
}

.score-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--surface);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius);
    box-shadow: 0 2px 8px var(--shadow);
}

.score-label {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.score-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    min-width: 50px;
    text-align: center;
    transition: all 0.3s;
}

.score-value.score-update {
    transform: scale(1.3);
    color: #10b981;
}

.btn-clear-score {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.9rem;
    background: var(--surface);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: all 0.2s;
    font-weight: 500;
}

.btn-clear-score:hover {
    background: var(--surface-secondary);
    color: var(--text-primary);
    border-color: var(--text-secondary);
    transform: translateY(-1px);
}

.btn-clear-score:active {
    transform: translateY(0);
}

.word-display {
    margin-bottom: var(--spacing-xl);
    transition: all 0.3s ease;
    opacity: 0;
    transform: scale(0.95);
}

.word-display[style*="block"] {
    opacity: 1;
    transform: scale(1);
    animation: revealWord 0.4s ease;
}

@keyframes revealWord {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(-10px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.word-card {
    background: var(--surface);
    border-radius: var(--radius);
    padding: var(--spacing-xl);
    box-shadow: 0 4px 12px var(--shadow);
    text-align: center;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: transform 0.2s, box-shadow 0.2s;
}

.word-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px var(--shadow-lg);
}

.word-text {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.05em;
    word-break: break-word;
    min-height: 1.2em;
}

.word-text.hidden {
    color: var(--text-secondary);
    font-size: 4rem;
}

.word-text.revealed {
    color: var(--primary-color);
    animation: reveal 0.3s ease-in;
}

@keyframes reveal {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.word-hint {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-style: italic;
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--background);
    border-radius: var(--radius-sm);
    max-width: 600px;
    line-height: 1.5;
}

.definition-hint {
    max-width: 600px;
    margin: 0 auto var(--spacing-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--surface);
    border-radius: var(--radius);
    font-family: Georgia, 'Times New Roman', serif;
    font-style: italic;
    font-size: 1.1rem;
    color: var(--text-primary);
    line-height: 1.6;
    text-align: center;
    border: none;
    box-shadow: none;
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(-10px);
}

.definition-hint[style*="block"] {
    opacity: 1;
    transform: translateY(0);
    animation: slideInDefinition 0.3s ease;
}

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

/* Math Game Styles */
.math-input-container {
    margin-bottom: var(--spacing-xl);
    text-align: center;
    width: 100%;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.math-input-container .spelling-label {
    width: 100%;
    max-width: 600px;
    margin-bottom: var(--spacing-md);
}

.math-input-container #answerInput {
    width: 100%;
    max-width: 600px;
    margin: 0 auto var(--spacing-lg) auto;
    display: block;
    box-sizing: border-box;
}

.question-display {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-xl);
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: 0 4px 12px var(--shadow);
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.spelling-input-container {
    background: var(--surface);
    border-radius: var(--radius);
    padding: var(--spacing-xl);
    box-shadow: 0 2px 8px var(--shadow);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.button-group {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-lg);
    flex-wrap: wrap;
}

.button-group .btn {
    flex: 1;
    min-width: 200px;
    max-width: 300px;
    margin-top: 0;
}

.spelling-label {
    display: block;
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.spelling-input {
    width: 100%;
    max-width: 600px;
    font-size: 2.5rem;
    font-weight: 600;
    padding: var(--spacing-lg) var(--spacing-xl);
    border: 3px solid var(--border);
    border-radius: var(--radius);
    text-align: center;
    letter-spacing: 0.1em;
    background: var(--surface);
    color: var(--text-primary);
    transition: all 0.3s ease;
    font-family: 'Figtree', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

.spelling-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
    transform: scale(1.02);
}

.spelling-input:disabled {
    background: var(--background);
    opacity: 0.7;
    cursor: not-allowed;
}

.attempts-info {
    margin: var(--spacing-md) auto;
    text-align: center;
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
    max-width: 600px;
}

.feedback-message {
    margin: var(--spacing-md) auto;
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 1.2rem;
    font-weight: 600;
    min-height: 1.5em;
    display: none;
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    max-width: 600px;
    text-align: center;
}

.feedback-message.feedback-visible {
    display: block;
    opacity: 1;
    transform: translateY(0);
    animation: slideInFeedback 0.3s ease;
}

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

.feedback-success {
    background: #d1fae5;
    color: #065f46;
    border: 2px solid #10b981;
}

.feedback-error {
    background: #fee2e2;
    color: #991b1b;
    border: 2px solid #ef4444;
}

.feedback-info {
    background: #dbeafe;
    color: #1e40af;
    border: 2px solid #3b82f6;
}

.feedback-hint {
    background: #fef3c7;
    color: #92400e;
    border: 2px solid #f59e0b;
    font-size: 1.1rem;
    line-height: 1.5;
}

.toast {
    position: fixed;
    bottom: -100px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    transition: bottom 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    pointer-events: none;
}

.toast.toast-visible {
    bottom: var(--spacing-xl);
    pointer-events: auto;
}

.toast-content {
    background: var(--surface);
    color: var(--text-primary);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius);
    box-shadow: 0 8px 24px var(--shadow-lg);
    font-size: 1.2rem;
    font-weight: 600;
    min-width: 280px;
    text-align: center;
    border: 2px solid var(--border);
    animation: toastSlideIn 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.toast-content.toast-success {
    background: #d1fae5;
    color: #065f46;
    border-color: #10b981;
}

.toast-content.toast-error {
    background: #fee2e2;
    color: #991b1b;
    border-color: #ef4444;
}

.toast-content.toast-info {
    background: #dbeafe;
    color: #1e40af;
    border-color: #3b82f6;
}

.countdown-timer {
    max-width: 400px;
    margin: var(--spacing-lg) auto;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: 0 4px 12px var(--shadow);
    animation: slideDown 0.3s ease;
}

.countdown-content {
    text-align: center;
}

.countdown-text {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.countdown-text span {
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: 700;
    min-width: 30px;
    display: inline-block;
}

.countdown-progress {
    width: 100%;
    height: 8px;
    background: var(--surface-secondary);
    border-radius: 4px;
    overflow: hidden;
}

.countdown-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-hover));
    border-radius: 4px;
    transition: width 1s linear;
    width: 100%;
}

.gif-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.gif-overlay-content {
    position: relative;
    max-width: 90%;
    max-height: 90%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.gif-overlay-content img {
    max-width: 100%;
    max-height: 80vh;
    border-radius: var(--radius);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    animation: scaleIn 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.5);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.gif-close {
    position: absolute;
    top: -15px;
    right: -15px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.9);
    border: 2px solid var(--text-primary);
    color: var(--text-primary);
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.gif-close:hover {
    background: white;
    transform: scale(1.1);
}

.gif-close:active {
    transform: scale(0.95);
}

.btn-large {
    font-size: 1.2rem;
    padding: var(--spacing-lg) var(--spacing-xl);
    min-width: 200px;
    margin-top: var(--spacing-md);
}

.btn-fullwidth {
    width: 100%;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Hide controls section - buttons are now in input containers */
.controls {
    display: none;
}

/* Game content should also be vertically centered */
.game-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
    min-height: 100vh;
    padding: var(--spacing-md) 0;
}

.btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all 0.2s;
    min-width: 160px;
    justify-content: center;
    box-shadow: 0 2px 8px var(--shadow);
}

.btn:active {
    transform: scale(0.98);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    position: relative;
}

.btn.loading {
    position: relative;
}

.btn.loading .btn-icon {
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    box-shadow: 0 4px 12px var(--shadow-lg);
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--secondary-hover);
    box-shadow: 0 4px 12px var(--shadow-lg);
}

.btn-icon {
    font-size: 1.2rem;
}

.word-list-container {
    background: var(--surface);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    box-shadow: 0 2px 8px var(--shadow);
    margin-bottom: var(--spacing-xl);
}

.word-list-container h2,
.word-list-container h4 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.config-title-link {
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    /* Completely invisible - blends with text */
}

.word-list {
    display: flex;
    flex-wrap: nowrap;
    flex-direction: column;
    gap: var(--spacing-xs);
    max-height: 400px;
    overflow-y: auto;
}

.word-item {
    padding: 4px 8px;
    background: var(--background);
    border-radius: var(--radius-sm);
    text-align: left;
    font-weight: 400;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
    border: 2px solid transparent;
    display: flex;
    align-items: center;
    gap: 8px;
    min-height: 24px;
}

.word-checkmark {
    color: var(--primary-color);
    font-weight: bold;
    min-width: 16px;
    text-align: center;
    flex-shrink: 0;
}

.word-item .word-text {
    flex: 1;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1;
}

/* Config menu word list - completely separate styling */
.config-word-checkmark {
    color: var(--primary-color);
    font-weight: bold;
    min-width: 16px;
    text-align: center;
    flex-shrink: 0;
}

.config-word-text {
    flex: 1;
    font-size: 1rem;
    font-weight: normal;
    line-height: normal;
    letter-spacing: normal;
    text-align: left;
    vertical-align: baseline;
    font-family: inherit;
}

.word-item:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.word-item.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-hover);
    box-shadow: 0 2px 8px var(--shadow);
}

.word-list-empty {
    padding: var(--spacing-lg);
    text-align: center;
    color: var(--text-secondary);
    font-style: italic;
}

.settings-toggle {
    position: fixed;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    background: var(--primary-color);
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 4px 12px var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    z-index: 100;
}

.settings-toggle:hover {
    background: var(--primary-hover);
    transform: scale(1.1);
    box-shadow: 0 6px 16px var(--shadow-lg);
}

.settings-toggle:active {
    transform: scale(0.95);
}

.settings-icon {
    display: block;
}

.settings {
    position: fixed;
    top: 70px;
    right: var(--spacing-md);
    background: var(--surface);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    box-shadow: 0 8px 24px var(--shadow-lg);
    max-width: 400px;
    max-height: 80vh;
    overflow-y: auto;
    z-index: 99;
    animation: slideDown 0.3s ease-out;
}

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

.settings-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--border);
}

.settings-header h3 {
    margin: 0;
    font-size: 1.5rem;
}

.settings-close {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.settings-close:hover {
    background: var(--background);
    color: var(--text-primary);
}

.settings h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.setting-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.setting-group label {
    font-weight: 500;
    min-width: 80px;
    color: var(--text-primary);
}

.setting-group select {
    flex: 1;
    padding: var(--spacing-sm);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    background: var(--surface);
    color: var(--text-primary);
    cursor: pointer;
    transition: border-color 0.2s;
}

.setting-group select:hover {
    border-color: var(--primary-color);
}

.setting-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.setting-group label input[type="checkbox"] {
    margin-right: var(--spacing-sm);
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.setting-group input[type="password"],
.setting-group input[type="text"] {
    flex: 1;
    padding: var(--spacing-sm);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    background: var(--surface);
    color: var(--text-primary);
    font-family: monospace;
}

.setting-group input[type="password"]:focus,
.setting-group input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.btn-small {
    padding: var(--spacing-xs) var(--spacing-md);
    min-width: auto;
    font-size: 0.9rem;
}

.setting-hint {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-left: var(--spacing-sm);
}

.setting-info {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--background);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--primary-color);
}

.setting-info p {
    margin: 0;
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--text-secondary);
}

.setting-info a {
    color: var(--primary-color);
    text-decoration: none;
}

.setting-info a:hover {
    text-decoration: underline;
}

.loading {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    color: white;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.confetti-particle {
    position: fixed;
    width: 10px;
    height: 10px;
    top: -10px;
    pointer-events: none;
    z-index: 10000; /* Higher than GIF overlay (2000) to appear on top */
    animation: confetti-fall 3s linear forwards;
    will-change: transform, opacity; /* Optimize animation performance */
}

@keyframes confetti-fall {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}

@media (max-width: 600px) {
    body {
        padding: var(--spacing-sm);
    }
    
    header h1 {
        font-size: 2rem;
    }

    .word-text {
        font-size: 2rem;
    }

    .spelling-input {
        font-size: 2rem;
        padding: var(--spacing-md) var(--spacing-lg);
    }

    .score-display {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .score-item {
        width: 100%;
        justify-content: space-between;
    }

    .settings {
        top: 60px;
        right: var(--spacing-sm);
        left: var(--spacing-sm);
        max-width: none;
    }

    .settings-toggle {
        top: var(--spacing-sm);
        right: var(--spacing-sm);
        width: 44px;
        height: 44px;
        font-size: 1.3rem;
    }

    .button-group {
        flex-direction: column;
    }

    .button-group .btn {
        width: 100%;
        max-width: 100%;
    }

    .word-list {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }
}