:root {
    --bg: #fafafa;
    --text: #2c2c2c;
    --text-light: #666;
    --accent: #e32915;
    --accent-hover: #c0392b;
    --border: #e5e5e5;
    --card-bg: #ffffff;
    --code-bg: #f8f9fa;
    --success: #27ae60;
    --error: #f56565;
    --error-rgb: 245, 101, 101;
    --error-bg: #fff5f5;
    --font-sans-serif: ui-rounded, -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Icons", "Helvetica Neue", Helvetica, Arial, sans-serif;
    --font-code: 'MonoLisa Script', 'MonoLisa', 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    scrollbar-color: var(--accent) transparent;
    accent-color: var(--accent);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0d1117;
        --text: #e6edf3;
        --text-light: #8b949e;
        --accent: #e32915;
        --accent-hover: #cf2626;
        --border: #30363d;
        --card-bg: #161b22;
        --code-bg: #0d1117;
        --success: #3fb950;
        --error: #f56565;
        --error-rgb: 245, 101, 101;
        --error-bg: #2c1a1a;
    }
}

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

::selection {
    background: var(--accent);
    color: white;
}

::-moz-selection {
    background: var(--accent);
    color: white;
}

body {
    display: flex;
    flex-direction: column;
    background: var(--bg);
    min-height: 100vh;
    color: var(--text);
    font-family: var(--font-sans-serif);
}

.container {
    display: flex;
    flex: 1;
    justify-content: center;
    align-items: center;
    margin: 0 auto;
    padding: 20px 20px 90px 20px;
    width: 100%;
    max-width: 400px;
}

.card {
    cursor: text;
    box-shadow: rgba(0, 0, 0, 0.1) 0px 4px 12px;
    border: 1px solid var(--border);
    border-radius: 24px;
    background: var(--card-bg);
    padding: 60px 40px;
    text-align: center;
}

.card.incorrect {
    box-shadow: 0 20px 40px rgba(var(--error-rgb), 0.2);
    border: 3px solid var(--error);
    background: var(--error-bg);
}

.letter-display {
    transition: all 0.2s ease;
    margin-bottom: 40px;
    color: var(--text);
    font-weight: 300;
    font-size: 120px;
    line-height: 1;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}

#userInput {
    transition: all 0.2s ease;
    outline: none;
    border: none;
    border-radius: 16px;
    background: transparent;
    padding: 16px 20px;
    width: 100%;
    color: var(--text);
    font-size: 18px;
    text-align: center;
}

#userInput:focus {
    background: transparent;
}

#userInput.correct {
    background: transparent;
}

#userInput.incorrect {
    border: none;
    background: transparent;
}

.feedback {
    opacity: 0;
    transition: opacity 0.2s ease;
    margin-top: 20px;
    min-height: 20px;
    font-size: 16px;
    user-select: none;
}

.feedback.show {
    opacity: 1;
}

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

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

.top-row {
    display: flex;
    position: relative;
    justify-content: flex-end;
    z-index: 1000;
    padding: 20px;
    width: 100%;
}

.top-buttons {
    display: flex;
    align-items: center;
    gap: 12px;
}

.github-btn,
.help-btn,
.settings-btn {
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.2s ease;
    cursor: pointer;
    box-shadow: rgba(0, 0, 0, 0.05) 0px 0px 0px 1px, var(--border) 0px 0px 0px 1px inset;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--card-bg);
    width: 44px;
    height: 44px;
    color: var(--text);
    text-decoration: none;
}

.settings-btn {
    position: relative;
}

.settings-btn svg {
    transition: transform 0.3s ease;
    width: 20px;
    height: 20px;
}

.github-btn:hover,
.help-btn:hover,
.settings-btn:hover {
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}


.settings-modal {
    display: flex;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    justify-content: center;
    align-items: center;
    visibility: hidden;
    opacity: 0;
    z-index: 2000;
    transition: all 0.3s ease;
    background: rgba(0, 0, 0, 0.5);
    overflow: hidden;
}

.settings-modal.show {
    visibility: visible;
    opacity: 1;
}

.settings-content {
    display: flex;
    flex-direction: column;
    transform: scale(0.9);
    transition: transform 0.3s ease;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: var(--card-bg);
    width: 90%;
    max-width: 500px;
    max-height: 80vh;
    overflow: hidden;
}

.settings-scrollable {
    flex: 1;
    padding: 30px;
    overflow-y: auto;
}

.settings-modal.show .settings-content {
    transform: scale(1);
}

.settings-header {
    display: flex;
    flex-shrink: 0;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0;
    padding: 30px 30px 20px 30px;
}

.settings-header h2 {
    margin: 0;
    color: var(--text);
}

.close-btn {
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background 0.2s ease;
    cursor: pointer;
    border: none;
    border-radius: 50%;
    background: none;
    padding: 0;
    width: 30px;
    height: 30px;
    color: var(--text-light);
    font-size: 24px;
}

.close-btn:hover {
    background: var(--code-bg);
}

.setting-group {
    margin-bottom: 20px;
}

.setting-group:last-child {
    margin-bottom: 0;
}

.setting-group h3 {
    margin: 0 0 12px 0;
    color: var(--text-light);
    font-weight: 500;
    font-size: 16px;
}

.radio-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.radio-group label {
    display: flex;
    align-items: center;
    transition: background 0.2s ease;
    cursor: pointer;
    border-radius: 8px;
    padding: 8px 12px;
}

.radio-group label:hover {
    background: var(--code-bg);
}

.radio-group input {
    margin-right: 10px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    transition: background 0.2s ease;
    cursor: pointer;
    border-radius: 8px;
    padding: 8px 12px;
}

.checkbox-label:hover {
    background: var(--code-bg);
}

.checkbox-label input {
    margin-right: 10px;
}

.letter-checkboxes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(60px, 1fr));
    gap: 8px;
    margin-bottom: 15px;
}

.letter-checkbox {
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: all 0.2s ease;
    cursor: pointer;
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: 8px;
}

.letter-checkbox:hover {
    border-color: var(--accent);
}

.letter-checkbox.selected {
    border-color: var(--accent);
    background: var(--code-bg);
}

.letter-checkbox input {
    margin: 0;
    margin-bottom: 4px;
}

.letter-checkbox .letter {
    transition: text-transform 0.3s ease;
    font-weight: bold;
    font-size: 18px;
}


.setting-header-with-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.setting-header-with-controls h3 {
    margin: 0;
}

.checkbox-controls {
    display: flex;
    gap: 10px;
}

.checkbox-controls button {
    transition: all 0.2s ease;
    cursor: pointer;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--card-bg);
    padding: 8px 16px;
    color: var(--text);
}

.checkbox-controls button:hover {
    border-color: var(--accent);
}

/* Setting subgroups */
.setting-subgroup {
    margin-bottom: 20px;
}

.setting-subgroup:last-child {
    margin-bottom: 0;
}

.setting-subgroup h4 {
    margin-bottom: 12px;
    color: var(--text);
    font-weight: 600;
    font-size: 14px;
}

/* Case checkboxes */
.case-checkboxes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 8px;
    margin-bottom: 20px;
}

.case-checkbox {
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: all 0.2s ease;
    cursor: pointer;
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: 12px 8px;
}

.case-checkbox:hover {
    border-color: var(--accent);
}

.case-checkbox.selected {
    border-color: var(--accent);
    background: var(--accent);
    color: white;
}

.case-checkbox.disabled {
    cursor: not-allowed;
}

.case-checkbox.disabled:hover {
    border-color: var(--border);
}

.case-checkbox input {
    display: none;
}

.case-checkbox .case-preview {
    margin-bottom: 4px;
    font-weight: bold;
    font-size: 20px;
    font-family: var(--font-sans-serif);
}

.case-checkbox .case-name {
    font-weight: 500;
    font-size: 12px;
    text-align: center;
}

.font-checkboxes {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    margin-bottom: 15px;
}

@media (min-width: 340px) {
    .font-checkboxes {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 280px) {
    .font-checkboxes {
        grid-template-columns: 1fr;
    }
}

.font-checkbox {
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: all 0.2s ease;
    cursor: pointer;
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: 12px 8px;
}

.font-checkbox:hover {
    border-color: var(--accent);
}

.font-checkbox.selected {
    border-color: var(--accent);
    background: var(--accent);
    color: white;
}

.font-checkbox.disabled {
    cursor: not-allowed;
}

.font-checkbox.disabled:hover {
    border-color: var(--border);
}

.font-checkbox input {
    display: none;
}

.font-checkbox .font-preview {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 4px;
    height: 24px;
    font-weight: bold;
    font-size: 20px;
    line-height: 1;
}

.font-checkbox .font-preview.font-sans-serif {
    font-family: var(--font-sans-serif);
}

.font-checkbox .font-preview.font-serif {
    font-family: Georgia, "Times New Roman", Times, serif;
}

.font-checkbox .font-preview.font-monospace {
    font-family: var(--font-code);
}

.font-checkbox .font-preview.font-cursive {
    font-family: "Brush Script MT", "Lucida Handwriting", cursive;
}

.font-checkbox .font-name {
    font-weight: 500;
    font-size: 12px;
    text-align: center;
}

/* Font styles for letter display */
.letter-display.font-sans-serif {
    font-family: var(--font-sans-serif);
}

.letter-display.font-serif {
    font-family: Georgia, "Times New Roman", Times, serif;
}

.letter-display.font-monospace {
    font-family: var(--font-code);
}

.letter-display.font-cursive {
    font-family: "Brush Script MT", "Lucida Handwriting", cursive;
}

@media (max-width: 480px) {
    .container {
        padding: 20px 20px 110px 20px;
    }

    .card {
        padding: 40px 30px;
    }

    .letter-display {
        font-size: 80px;
    }

    #userInput {
        font-size: 16px;
    }
}

/* Stats Bar - Bottom */
.stats-bar {
    position: fixed;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 100;
    border-top: 1px solid var(--border);
    background: var(--card-bg);
}

.stats-main {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    padding: 24px 40px;
}

.stats-text {
    display: flex;
    align-items: center;
    gap: 16px;
    color: var(--text-light);
    font-size: 0.9em;
}

.divider {
    opacity: 0.5;
    color: var(--text-light);
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
}

.streak-display {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.fire-icon {
    flex-shrink: 0;
    vertical-align: baseline;
    width: 14px;
    height: 14px;
}

.stats-expand-btn {
    display: flex;
    flex-shrink: 0;
    justify-content: center;
    align-items: center;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
    border-radius: 4px;
    background: none;
    padding: 6px;
    color: var(--text-light);
}

.stats-expand-btn:hover {
    background: var(--code-bg);
    color: var(--text);
}

.stats-expanded {
    transition: max-height 0.3s ease;
    border-top: 1px solid var(--border);
    background: var(--code-bg);
    max-height: 0;
    overflow: hidden;
}

.stats-expanded.open {
    max-height: 300px;
}

.container {
    transition: margin-bottom 0.3s ease;
}

.stats-expanded.open~.container,
body:has(.stats-expanded.open) .container {
    margin-bottom: 300px;
}

.stats-breakdown {
    margin: auto;
    padding: 16px 20px;
    max-width: 800px;
    max-height: 280px;
    overflow-y: auto;
}

.stats-overview {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: 16px;
    font-size: 0.85em;
}

.overview-item {
    color: var(--text-light);
}

.letter-stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px 16px;
}

.letter-stat-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 4px 0;
}

.letter-stat-letter {
    flex-shrink: 0;
    width: 20px;
    font-weight: 600;
    font-size: 1.1em;
    text-align: center;
}

.letter-stat-bar {
    flex: 1;
    border-radius: 4px;
    background: var(--border);
    min-width: 60px;
    height: 8px;
    overflow: hidden;
}

.letter-stat-fill {
    transition: width 0.5s ease;
    border-radius: 4px;
    height: 100%;
}

.letter-stat-fill[data-accuracy="100"] {
    background: var(--success);
}

.letter-stat-fill[data-accuracy^="9"] {
    background: var(--success);
}

.letter-stat-fill[data-accuracy^="8"] {
    background: var(--success);
}

.letter-stat-fill[data-accuracy^="7"] {
    background: #eab308;
}

.letter-stat-fill[data-accuracy^="6"] {
    background: #eab308;
}

.letter-stat-fill {
    background: var(--error);
}

.letter-stat-text {
    flex-shrink: 0;
    min-width: 70px;
    color: var(--text-light);
    font-size: 0.8em;
    text-align: right;
}

.no-stats {
    padding: 16px;
    color: var(--text-light);
    font-style: italic;
    text-align: center;
}

.hidden {
    display: none;
}

.stats-controls {
    display: flex;
    justify-content: center;
    margin-bottom: 16px;
    width: 100%;
}

.reset-btn {
    transition: all 0.2s ease;
    cursor: pointer;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--card-bg);
    padding: 6px 12px;
    color: var(--text-light);
    font-size: 0.85em;
}

.reset-btn:hover {
    border-color: var(--error);
    background: var(--error-bg);
    color: var(--error);
}

@media (max-width: 480px) {
    .stats-main {
        gap: 16px;
        padding-top: 10px;
        padding-bottom: 25px;
    }

    .stats-text {
        gap: 12px;
        font-size: 0.8em;
    }

    .stats-breakdown {
        padding: 12px 15px;
    }

    .stats-overview {
        grid-template-columns: 1fr;
        gap: 4px;
    }

    .letter-stats-grid {
        grid-template-columns: 1fr;
        gap: 6px;
    }
}

/* PWA install banner */
#ios-install-prompt {
    display: none;
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    box-shadow: rgba(0, 0, 0, 0.1) 0px 4px 12px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--card-bg);
    padding: 16px;
    min-width: 250px;
    max-width: 90%;
    color: var(--text);
    font-size: 0.88rem;
    text-align: center;
}

#ios-install-prompt p {
    margin: 0;
    margin-bottom: 8px;
}

#ios-install-prompt p:last-child {
    margin-bottom: 0;
}

#share-icon {
    vertical-align: middle;
    margin: 0 4px;
}

.app-name {
    color: var(--accent);
    font-weight: bold;
}

.close-button {
    /* Add some padding for a larger click target (offset by negative margin) */
    margin: -8px;
    padding: 8px;
}

#close-ios-install-prompt {
    position: absolute;
    top: 5px;
    right: 10px;
    box-shadow: none;
    border: none;
    background: none;
    font-size: 24px;
}

#close-ios-install-prompt:hover {
    transform: none;
}

.icon {
    -webkit-user-select: none;
    cursor: pointer;
    color: var(--text-light);
    user-select: none;
    text-decoration: none;
}

.icon:hover {
    color: var(--accent);
}

/* Help Modal */
.help-modal {
    display: flex;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    justify-content: center;
    align-items: center;
    visibility: hidden;
    opacity: 0;
    z-index: 2000;
    transition: all 0.3s ease;
    background: rgba(0, 0, 0, 0.5);
    overflow: hidden;
}

.help-modal.show {
    visibility: visible;
    opacity: 1;
}

.help-content {
    display: flex;
    flex-direction: column;
    transform: scale(0.9);
    transition: transform 0.3s ease;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--card-bg);
    width: 100%;
    max-width: 600px;
    max-height: 80vh;
    overflow: hidden;
}

.help-scrollable {
    flex: 1;
    padding: 30px;
    overflow-y: auto;
}

.help-modal.show .help-content {
    transform: scale(1);
}

.help-header {
    display: flex;
    flex-shrink: 0;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0;
    padding: 30px 30px 20px 30px;
    border-bottom: 1px solid var(--border);
}

.help-header h2 {
    margin: 0;
    color: var(--text);
    font-size: 20px;
    font-weight: 600;
}

.help-description {
    margin-bottom: 20px;
    color: var(--text-light);
    font-size: 15px;
    line-height: 1.5;
}

.letters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: 8px;
}

.letter-item {
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 8px;
    text-align: center;
    font-size: 14px;
    transition: all 0.2s ease;
}

.letter-item:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.letter-cyrillic {
    font-size: 20px;
    font-weight: bold;
    color: var(--accent);
    margin-bottom: 2px;
}

.letter-latin {
    color: var(--text-light);
    font-size: 12px;
}

@media (max-width: 640px) {
    .help-content {
        margin: 10px;
        padding: 20px;
    }
    
    .letters-grid {
        grid-template-columns: repeat(auto-fit, minmax(70px, 1fr));
        gap: 6px;
    }
    
    .letter-item {
        padding: 6px;
    }
    
    .letter-cyrillic {
        font-size: 18px;
    }
}