/* h1 keeps 1.4em, .book-link-h1 matches book text size */
/* Book reader links match THKS tab links */
.book-reader-content a {
    color: #268bd2;
    text-decoration: none;
    font-weight: bold;
    background-color: #268bd2;
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.12) 2px,
            rgba(0, 0, 0, 0.12) 4px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.12) 2px,
            rgba(0, 0, 0, 0.12) 4px
        );
    background-size: 4px 4px;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    transition: opacity 0.2s;
}
.book-reader-content a:hover {
    opacity: 0.7;
}
@media (prefers-color-scheme: dark) {
    .book-reader-content a {
        color: #3294c2;
        background-color: #3294c2;
        background-image: 
            repeating-linear-gradient(
                0deg,
                transparent,
                transparent 2px,
                rgba(0, 0, 0, 0.08) 2px,
                rgba(0, 0, 0, 0.08) 4px
            ),
            repeating-linear-gradient(
                90deg,
                transparent,
                transparent 2px,
                rgba(0, 0, 0, 0.08) 2px,
                rgba(0, 0, 0, 0.08) 4px
            );
    }
}
body.force-dark .book-reader-content a {
    color: #3294c2;
    background-color: #3294c2;
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.08) 2px,
            rgba(0, 0, 0, 0.08) 4px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.08) 2px,
            rgba(0, 0, 0, 0.08) 4px
        );
}

body.force-dark h1, body.force-dark .book-link-h1 {
    background-color: #3294c2;
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.08) 2px,
            rgba(0, 0, 0, 0.08) 4px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.08) 2px,
            rgba(0, 0, 0, 0.08) 4px
        );
    color: #3294c2;
}
/* Responsive tab overflow classes */
.tabs.tight-tabs .tab {
    padding: 4px 8px !important;
    font-size: 1em !important;
}
.tabs.tighter-tabs .tab {
    padding: 4px 4px !important;
    font-size: 0.9em !important;
}
.tabs.tiny-tabs .tab {
    padding: 4px 2px !important;
    font-size: 0.9em !important;
}
/* BOOK Tab Styles */
.book-list-container {
    height: 100%;
    overflow-y: auto;
    background: var(--bg-base);
    border: 2px solid var(--border-color);
    box-shadow: 2px 2px 0 var(--border-color);
    padding: 0;
    margin: 0;
    scrollbar-width: thin;
    scrollbar-color: #586e75 var(--bg-surface);
    /* Allow native vertical panning on touch devices (preserve momentum) */
    touch-action: pan-y;
    -webkit-overflow-scrolling: touch;
}

.book-percent-read {
    float: right;
    text-align: right;
    min-width: 3em;
    font-weight: normal;
    color: inherit;
    vertical-align: middle;
}

/* Blocky, square-ended, dithered scrollbars (global + per-component fallback)
   - WebKit (Chrome / Safari / Edge): custom thumb with repeating dither and square end caps
   - Firefox: fallback using scrollbar-color and scrollbar-width
*/
/* Firefox fallback for all scrollable elements */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--scroll-thumb) var(--bg-surface);
}

/* WebKit-based browsers (Chrome / Safari / Edge) */
*::-webkit-scrollbar {
    width: 18px;
    height: 18px;
    background: var(--bg-surface);
}
*::-webkit-scrollbar-thumb {
    /* dithered diagonal pattern using the two theme colors */
    background: repeating-linear-gradient(135deg, var(--scroll-thumb) 0 4px, var(--scroll-thumb-alt) 4px 8px);
    border: 2px solid var(--border-color);
    border-radius: 0; /* square end caps */
    min-height: 32px;
    box-shadow: none;
}
*::-webkit-scrollbar-track {
    background: var(--bg-surface);
    border-radius: 0;
}
*::-webkit-scrollbar-corner {
    background: var(--bg-surface);
}

/* Keep the component-specific rule for .book-list-container so it remains explicit */
.book-list-container::-webkit-scrollbar { width: 18px; background: var(--bg-surface); }
.book-list-container::-webkit-scrollbar-thumb { background: repeating-linear-gradient(135deg, var(--scroll-thumb) 0 4px, var(--scroll-thumb-alt) 4px 8px); border: 2px solid var(--border-color); border-radius: 0; min-height: 32px; }
.book-list-container::-webkit-scrollbar-track { background: var(--bg-surface); }

.book-list {
    list-style: none;
    margin: 0;
    padding: 0;
}
.book-list-item {
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    padding: 5px 18px 5px 32px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    background: none;
    color: var(--text-primary);
    transition: background 0.15s, color 0.15s;
    outline: none;
    position: relative;
    user-select: none;
}
.book-list-item:last-child {
    border-bottom: none;
}
.book-list-item:focus-visible {
    outline: 3px solid #268bd2;
    background: var(--bg-surface);
}
.book-list-item:hover {
    background: var(--bg-surface);
}
.book-list-item .offline-indicator {
    position: absolute;
    left: 8px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.9em;
    color: #35b1a8;
}
.book-list-item.read {
    text-decoration: line-through;
    color: #93a1a1;
    font-weight: normal;
}
.book-list-item.started {
    font-weight: bold;
}
.book-list-item.unread {
    font-weight: normal;
}

/* Book reader container */
.book-reader-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-base);
    z-index: 20;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    box-shadow: 2px 2px 0 var(--border-color);
    border: 2px solid var(--border-color);
    padding: 0;
    overflow: hidden;
}
.book-reader-header {
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: var(--bg-surface);
    border-bottom: 2px solid var(--border-color);
    padding: 8px 12px;
    font-family: inherit;
    font-size: 1em;
    font-weight: bold;
    letter-spacing: 2px;
}
.book-reader-close {
    cursor: pointer;
    font-size: 1.2em;
    background: none;
    border: none;
    color: #dc322f;
    font-weight: bold;
    margin-left: 12px;
    position: absolute;
    right: 16px;
    top: 8px;
    user-select: none;
}
.book-reader-content {
    flex: 1;
    overflow-y: auto;
    padding: 24px 18px 24px 18px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 1.1em;
    /* Use a dedicated --book-text variable so we can increase contrast in
       light mode without changing the global --text-primary for other UI. */
    color: var(--book-text, var(--text-primary));
    background: var(--bg-base);
    white-space: pre-wrap;
    word-break: break-word;
    line-height: 1.7;
    user-select: text;
    -webkit-user-select: text;
    outline: none;
    /* Allow native vertical panning on touch devices (preserve momentum) */
    touch-action: pan-y;
    -webkit-overflow-scrolling: touch;
}
.book-reader-content:focus-visible {
    outline: 3px solid #268bd2;
}

/* ASCII spinner */
.book-spinner {
    font-family: 'Courier New', Courier, monospace;
    font-size: 1.2em;
    color: #268bd2;
    text-align: center;
    margin: 48px 0 0 0;
    letter-spacing: 2px;
    animation: book-spinner-anim 1s steps(4) infinite;
    user-select: none;
}
@keyframes book-spinner-anim {
    0% { opacity: 1; }
    25% { opacity: 0.7; }
    50% { opacity: 0.5; }
    75% { opacity: 0.7; }
    100% { opacity: 1; }
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    /* Disable all mobile gestures globally */
    touch-action: manipulation;
    -webkit-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
}

/* Allow text selection and native touch-callout inside the Book reader only.
   This overrides the global "user-select: none" reset but keeps interaction
   blocked for the rest of the UI. The rule targets the book reader container
   (present only when a book is open) so selection is enabled only while
   reading. */
.book-reader-container,
.book-reader-container * {
    -webkit-user-select: text !important;
    user-select: text !important;
    -webkit-touch-callout: default !important;
    touch-action: auto !important;
}

/* Solarized Light (default) */
:root {
    --bg-base: #fdf6e3;
    --bg-surface: #eee8d5;
    --text-primary: #586e75;
    --text-secondary: #93a1a1;
    --border-color: #93a1a1;
    /* scrollbar colors used for dithered thumb pattern */
    --scroll-thumb: #586e75;
    --scroll-thumb-alt: #eee8d5;
}

/* Book-specific text override: increase contrast for book body in light mode
   without altering global --text-primary used elsewhere. Defaults to the
   global value so dark mode preserves existing styling. */
:root {
    --book-text: var(--text-primary);
}

@media (prefers-color-scheme: light) {
    /* Stronger, darker book text for better legibility on light backgrounds */
    :root {
        --book-text: #073642; /* Solarized base02 - high contrast on light bg */
    }
}

@media (prefers-color-scheme: dark) {
    /* Ensure book text in dark mode stays the intended lighter shade */
    :root {
        --book-text: var(--text-primary);
    }
}

body.force-light {
    --book-text: #073642;
}
body.force-dark {
    --book-text: var(--text-primary);
}

/* Solarized Dark */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-base: #002b36;
        --bg-surface: #073642;
        --text-primary: #839496;
        --text-secondary: #586e75;
        --border-color: #586e75;
        /* dark theme scrollbar variants */
        --scroll-thumb: #839496;
        --scroll-thumb-alt: #073642;
    }
}

body {
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: 'Courier New', 'Courier', monospace;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    /* Disable mobile gestures */
    overscroll-behavior: none;
    touch-action: manipulation;
    -webkit-overflow-scrolling: auto;
    position: fixed;
    width: 100%;
    height: 100%;
    -webkit-text-size-adjust: none;
    text-size-adjust: none;
}

/* Mobile devices: position at top instead of center to avoid Safari toolbar issues */
@media (pointer: coarse) and (hover: none) {
    body {
        align-items: flex-start;
        padding-top: 20px;
    }
}

.container {
    position: relative;
    width: min(600px, 100%);
    aspect-ratio: 2 / 3;
    height: min(80vh, 900px);
    max-height: 700px; /* Absolute maximum height for better performance on large displays */
    border: 3px solid var(--border-color);
    background-color: var(--bg-surface);
    display: flex;
    flex-direction: column;
    box-shadow: 4px 4px 0px var(--border-color);
}

main {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
}

.menu-bar {
    background-color: #268bd2;
    background-image: 
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.15) 2px,
            rgba(0, 0, 0, 0.15) 4px
        ),
        repeating-linear-gradient(
            -45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.15) 2px,
            rgba(0, 0, 0, 0.15) 4px
        );
    background-size: 4px 4px;
    color: var(--bg-base);
    padding: 8px 12px;
    border-bottom: 3px solid var(--border-color);
    font-weight: bold;
    letter-spacing: 2px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
    overflow: hidden;
}

.menu-bar > span:nth-child(2) {
    flex: 1;
    text-align: center;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.theme-toggle {
    cursor: pointer;
    padding: 4px 8px;
    margin: -4px 0;
    transition: opacity 0.2s;
    user-select: none;
    line-height: 1;
    display: inline-flex;
    align-items: center;
}

.theme-toggle:hover {
    opacity: 0.7;
}

.theme-toggle:active {
    opacity: 0.5;
}

.mute-toggle {
    cursor: pointer;
    padding: 4px 8px;
    margin: -4px 0;
    transition: opacity 0.2s;
    user-select: none;
    font-size: 1.2em;
    line-height: 1;
    display: inline-flex;
    align-items: center;
}

.mute-toggle:hover {
    opacity: 0.7;
}

.mute-toggle:active {
    opacity: 0.5;
}

.reset-app {
    cursor: pointer;
    padding: 4px 8px;
    margin: -4px 0;
    transition: opacity 0.2s;
    user-select: none;
    font-size: 1.3em;
    line-height: 1;
    display: inline-flex;
    align-items: center;
}

.reset-app:hover {
    opacity: 0.7;
}

.reset-app:active {
    opacity: 0.5;
}

.menu-bar-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.menu-bar-right > span:last-child {
    line-height: 1;
    display: inline-flex;
    align-items: center;
}

/* Force dark mode when class is applied */
body.force-dark {
    --bg-base: #002b36;
    --bg-surface: #073642;
    --text-primary: #839496;
    --text-secondary: #586e75;
    --border-color: #586e75;
}

/* Force light mode when class is applied */
body.force-light {
    --bg-base: #fdf6e3;
    --bg-surface: #eee8d5;
    --text-primary: #586e75;
    --text-secondary: #93a1a1;
    --border-color: #93a1a1;
}

.tabs {
    display: flex;
    background-color: var(--text-secondary);
    background-image: 
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.06) 2px,
            rgba(0, 0, 0, 0.06) 4px
        ),
        repeating-linear-gradient(
            -45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.06) 2px,
            rgba(0, 0, 0, 0.06) 4px
        );
    background-size: 4px 4px;
    border-bottom: 3px solid var(--border-color);
}

.tab {
    padding: 8px 16px;
    cursor: pointer;
    /* Keep a readable tab font size by default; responsive classes can reduce this */
    font-size: 0.9em;
    background-color: var(--border-color);
    background-image: 
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.04) 2px,
            rgba(0, 0, 0, 0.04) 4px
        ),
        repeating-linear-gradient(
            -45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.04) 2px,
            rgba(0, 0, 0, 0.04) 4px
        );
    background-size: 4px 4px;
    color: var(--bg-base);
    border-right: 2px solid var(--text-secondary);
    font-weight: bold;
    letter-spacing: 1px;
    transition: background-color 0.2s;
    user-select: none;
    white-space: nowrap;
    /* Make tabs flex so they evenly fill available horizontal space */
    flex: 1 1 0;
    text-align: center;
}

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

.tab.active {
    background-color: var(--bg-surface);
    color: var(--text-primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: flex;
    flex-direction: column;
    flex: 1;
}

.content {
    flex: 1;
    padding: 24px;
    overflow: hidden;
    line-height: 1.6;
}

#home-content.active {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

canvas {
    display: block;
    width: 100%;
    height: 100%;
    touch-action: none;
    -webkit-user-select: none;
    user-select: none;
    background-color: var(--bg-surface);
}

#bonk-content {
    padding: 0;
    overflow: hidden;
    position: relative;
}

#blok-content {
    padding: 0;
    overflow: hidden;
    position: relative;
}

#draw-content {
    padding: 0;
    overflow: hidden;
    position: relative;
}

#note-content {
    padding: 0;
    overflow: hidden;
}

#calc-content.active {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

#drawCanvas {
    display: block;
    width: 100%;
    height: 100%;
    cursor: crosshair;
    touch-action: none;
    -webkit-user-select: none;
    user-select: none;
    background-color: var(--bg-surface);
}

#blokCanvas {
    display: block;
    width: 100%;
    height: 100%;
    touch-action: none;
    -webkit-user-select: none;
    user-select: none;
    background-color: var(--bg-surface);
}

.ascii-art {
    color: #dc322f;
    font-size: 0.7em;
    line-height: 1.2;
    margin-bottom: 16px;
    white-space: pre;
    overflow: hidden;
    text-align: left;
    transition: text-shadow 0.3s ease;
}

.ascii-art.glow {
    animation: ascii-glow 0.5s ease-out;
}

@keyframes ascii-glow {
    0% {
        text-shadow: 0 0 2px #dc322f, 0 0 4px #dc322f;
    }
    50% {
        text-shadow: 0 0 4px #dc322f, 0 0 8px #dc322f;
    }
    100% {
        text-shadow: none;
    }
}

@media (prefers-color-scheme: dark) {
    .ascii-art {
        color: #db5b26;
    }
    
    @keyframes ascii-glow {
        0% {
            text-shadow: 0 0 2px #db5b26, 0 0 4px #db5b26;
        }
        50% {
            text-shadow: 0 0 4px #db5b26, 0 0 8px #db5b26;
        }
        100% {
            text-shadow: none;
        }
    }
}

body.force-dark .ascii-art {
    color: #db5b26;
}

body.force-dark .ascii-art.glow {
    animation: ascii-glow-dark 2s ease-out;
}

@keyframes ascii-glow-dark {
    0% {
        text-shadow: 0 0 2px #db5b26, 0 0 4px #db5b26;
    }
    50% {
        text-shadow: 0 0 4px #db5b26, 0 0 8px #db5b26;
    }
    100% {
        text-shadow: none;
    }
}

h1 {
    font-size: 1.4em;
    margin-bottom: 2px;
    letter-spacing: 3px;
    background-color: #1e7bb2;
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.12) 2px,
            rgba(0, 0, 0, 0.12) 4px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.12) 2px,
            rgba(0, 0, 0, 0.12) 4px
        );
    background-size: 4px 4px;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: #1e7bb2;
}

@media (prefers-color-scheme: dark) {
    h1 {
        background-color: #3294c2;
        background-image: 
            repeating-linear-gradient(
                0deg,
                transparent,
                transparent 2px,
                rgba(0, 0, 0, 0.08) 2px,
                rgba(0, 0, 0, 0.08) 4px
            ),
            repeating-linear-gradient(
                90deg,
                transparent,
                transparent 2px,
                rgba(0, 0, 0, 0.08) 2px,
                rgba(0, 0, 0, 0.08) 4px
            );
        color: #3294c2;
    }
}

body.force-dark h1 {
    background-color: #3294c2;
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.08) 2px,
            rgba(0, 0, 0, 0.08) 4px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.08) 2px,
            rgba(0, 0, 0, 0.08) 4px
        );
    color: #3294c2;
}

p {
    margin-bottom: 16px;
    text-align: left;
    font-weight: 500;
}

.highlight {
    font-weight: bold;
    background-color: #dc322f;
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.12) 2px,
            rgba(0, 0, 0, 0.12) 4px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.12) 2px,
            rgba(0, 0, 0, 0.12) 4px
        );
    background-size: 4px 4px;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: #dc322f;
}

@media (prefers-color-scheme: dark) {
    .highlight {
        background-color: #db5b26;
        background-image: 
            repeating-linear-gradient(
                0deg,
                transparent,
                transparent 2px,
                rgba(0, 0, 0, 0.08) 2px,
                rgba(0, 0, 0, 0.08) 4px
            ),
            repeating-linear-gradient(
                90deg,
                transparent,
                transparent 2px,
                rgba(0, 0, 0, 0.08) 2px,
                rgba(0, 0, 0, 0.08) 4px
            );
        color: #db5b26;
    }
}

body.force-dark .highlight {
    background-color: #db5b26;
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.08) 2px,
            rgba(0, 0, 0, 0.08) 4px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.08) 2px,
            rgba(0, 0, 0, 0.08) 4px
        );
    color: #db5b26;
}

.cursor {
    animation: blink 1s infinite;
    background-color: var(--text-primary);
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.12) 2px,
            rgba(0, 0, 0, 0.12) 4px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.12) 2px,
            rgba(0, 0, 0, 0.12) 4px
        );
    background-size: 4px 4px;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: var(--text-primary);
}

@media (prefers-color-scheme: dark) {
    .cursor {
        background-image: 
            repeating-linear-gradient(
                0deg,
                transparent,
                transparent 2px,
                rgba(0, 0, 0, 0.08) 2px,
                rgba(0, 0, 0, 0.08) 4px
            ),
            repeating-linear-gradient(
                90deg,
                transparent,
                transparent 2px,
                rgba(0, 0, 0, 0.08) 2px,
                rgba(0, 0, 0, 0.08) 4px
            );
    }
}

body.force-dark .cursor {
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.08) 2px,
            rgba(0, 0, 0, 0.08) 4px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.08) 2px,
            rgba(0, 0, 0, 0.08) 4px
        );
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

/* Respect reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
    .cursor {
        animation: none;
        opacity: 1;
    }
    .clock-colon {
        animation: none;
        opacity: 1;
    }
}

/* Focus indicators for accessibility */
.tab:focus {
    /* Hide the native focus ring when the tab receives focus programmatically or via mouse.
       Keep :focus-visible below so keyboard users still see a clear outline. */
    outline: none;
}

.tab:focus-visible,
.calc-btn:focus-visible,
.note-key:focus-visible {
    outline: 3px solid #268bd2;
    outline-offset: 2px;
}

/* Skip link for keyboard navigation */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: #268bd2;
    color: var(--bg-base);
    padding: 8px 16px;
    text-decoration: none;
    font-weight: bold;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}

/* Visually hidden but accessible to screen readers */
.visually-hidden {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

/* Instruction popup styles */
.instruction-popup {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: var(--bg-surface);
    border: 3px solid var(--border-color);
    box-shadow: 4px 4px 0px var(--border-color);
    max-width: 400px;
    width: 80%;
    z-index: 50;
    text-align: center;
    display: flex;
    flex-direction: column;
}

.instruction-popup-title {
    background-color: #268bd2;
    background-image: 
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.15) 2px,
            rgba(0, 0, 0, 0.15) 4px
        ),
        repeating-linear-gradient(
            -45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.15) 2px,
            rgba(0, 0, 0, 0.15) 4px
        );
    background-size: 4px 4px;
    color: var(--bg-base);
    padding: 8px 12px;
    border-bottom: 3px solid var(--border-color);
    font-weight: bold;
    letter-spacing: 2px;
    text-align: center;
}

.instruction-popup-content {
    padding: 12px;
}

.instruction-popup-content p {
    margin-bottom: 12px;
    text-align: center;
    line-height: 1.6;
}

.instruction-popup button {
    font-family: 'Courier New', 'Courier', monospace;
    font-size: 1em;
    font-weight: bold;
    padding: 12px 32px;
    border: 3px solid var(--border-color);
    background-color: #859900;
    background-image: 
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.15) 2px,
            rgba(0, 0, 0, 0.15) 4px
        ),
        repeating-linear-gradient(
            -45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.15) 2px,
            rgba(0, 0, 0, 0.15) 4px
        );
    background-size: 4px 4px;
    color: var(--bg-base);
    cursor: pointer;
    box-shadow: 2px 2px 0px var(--border-color);
    margin-top: 16px;
    letter-spacing: 2px;
}

.instruction-popup button:hover {
    background-color: #719e07;
}

.instruction-popup button:active {
    box-shadow: 0px 0px 0px var(--border-color);
    transform: translate(2px, 2px);
}

/* Clock popup styles */
.clock-popup {
    max-width: 500px;
    z-index: 1000;
    /* Use fixed positioning so the popup sits above the full-screen overlay
       and remains centered regardless of scroll or parent stacking contexts. */
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.clock-popup-content {
    padding: 12px 12px 12px 12px;
}

/* Overlay for blocking interactions when clock is open */
.popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-surface);
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.04) 2px,
            rgba(0, 0, 0, 0.04) 4px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.04) 2px,
            rgba(0, 0, 0, 0.04) 4px
        );
    background-size: 4px 4px;
    opacity: 0.95;
    z-index: 999;
    display: none;
}

#ascii-clock-display {
    font-family: 'Courier New', 'Courier', monospace;
    font-size: 0.7em;
    line-height: 1.1;
    white-space: pre;
    text-align: center;
    margin-bottom: 12px;
    user-select: none;
    background-color: var(--text-primary);
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.12) 2px,
            rgba(0, 0, 0, 0.12) 4px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.12) 2px,
            rgba(0, 0, 0, 0.12) 4px
        );
    background-size: 4px 4px;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: var(--text-primary);
}

/* Allow colored spans in clock to override the dithering */
#ascii-clock-display span[style*="color"] {
    background: none !important;
    -webkit-background-clip: initial !important;
    background-clip: initial !important;
    -webkit-text-fill-color: initial !important;
}

@media (prefers-color-scheme: dark) {
    #ascii-clock-display {
        background-image: 
            repeating-linear-gradient(
                0deg,
                transparent,
                transparent 2px,
                rgba(0, 0, 0, 0.08) 2px,
                rgba(0, 0, 0, 0.08) 4px
            ),
            repeating-linear-gradient(
                90deg,
                transparent,
                transparent 2px,
                rgba(0, 0, 0, 0.08) 2px,
                rgba(0, 0, 0, 0.08) 4px
            );
    }
}

body.force-dark #ascii-clock-display {
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.08) 2px,
            rgba(0, 0, 0, 0.08) 4px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.08) 2px,
            rgba(0, 0, 0, 0.08) 4px
        );
}

#clock-date-display {
    font-family: 'Courier New', 'Courier', monospace;
    font-size: 1em;
    font-weight: bold;
    text-align: center;
    margin-bottom: 12px;
    letter-spacing: 1px;
    background-color: var(--text-primary);
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.12) 2px,
            rgba(0, 0, 0, 0.12) 4px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.12) 2px,
            rgba(0, 0, 0, 0.12) 4px
        );
    background-size: 4px 4px;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: var(--text-primary);
}

@media (prefers-color-scheme: dark) {
    #clock-date-display {
        background-image: 
            repeating-linear-gradient(
                0deg,
                transparent,
                transparent 2px,
                rgba(0, 0, 0, 0.08) 2px,
                rgba(0, 0, 0, 0.08) 4px
            ),
            repeating-linear-gradient(
                90deg,
                transparent,
                transparent 2px,
                rgba(0, 0, 0, 0.08) 2px,
                rgba(0, 0, 0, 0.08) 4px
            );
    }
}

body.force-dark #clock-date-display {
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.08) 2px,
            rgba(0, 0, 0, 0.08) 4px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.08) 2px,
            rgba(0, 0, 0, 0.08) 4px
        );
}

#clock-digital-display {
    font-family: 'Courier New', 'Courier', monospace;
    font-size: 0.9em;
    font-weight: 700;
    text-align: center;
    margin-bottom: 12px;
    letter-spacing: 2px;
    color: var(--text-primary);
}

#clock-home-btn {
    margin-top: 0;
}

.footer {
    border-top: 3px solid var(--border-color);
    padding: 8px 12px;
    background-color: var(--text-secondary);
    background-image: 
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.06) 2px,
            rgba(0, 0, 0, 0.06) 4px
        ),
        repeating-linear-gradient(
            -45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.06) 2px,
            rgba(0, 0, 0, 0.06) 4px
        );
    background-size: 4px 4px;
    color: var(--bg-base);
    font-size: 0.9em;
    font-weight: 500;
    text-align: left;
    letter-spacing: 1px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-text {
    cursor: pointer;
    transition: opacity 0.2s;
    font-weight: bold;
    user-select: none;
}

.footer-text:hover {
    opacity: 0.7;
}

.footer-text:active {
    opacity: 0.5;
}

/* Credits tab styles */
#thks-content {
    overflow: hidden;
}

#thks-content.active {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.thks-header {
    background-color: var(--text-secondary);
    background-image: 
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.06) 2px,
            rgba(0, 0, 0, 0.06) 4px
        ),
        repeating-linear-gradient(
            -45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.06) 2px,
            rgba(0, 0, 0, 0.06) 4px
        );
    background-size: 4px 4px;
    padding: 8px 16px;
    color: var(--bg-base);
    border-bottom: 3px solid var(--border-color);
    font-weight: bold;
    letter-spacing: 1px;
    text-align: center;
}

.thks-content-area {
    /* Match the `.content` formatting: let the outer `.content` container
        provide the 24px padding, keep this area unpadded so text lines up.
        Also ensure list spacing matches paragraph spacing in HOME. */
    padding: 0;
    overflow-y: auto;
    max-height: 60vh;
    min-height: 200px;
    -webkit-overflow-scrolling: touch;
    outline: none;
    scroll-behavior: smooth;
    /* visually match book list scroll area */
    border-radius: 4px;
    box-shadow: none;
    /* Hide scrollbars on Webkit */
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) var(--bg-surface);
}

.thks-content-area::-webkit-scrollbar {
    width: 8px;
    background: var(--bg-surface);
}
.thks-content-area::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.thks-content-area a {
    color: #268bd2;
    text-decoration: none;
    font-weight: bold;
    background-color: #268bd2;
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.12) 2px,
            rgba(0, 0, 0, 0.12) 4px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.12) 2px,
            rgba(0, 0, 0, 0.12) 4px
        );
    background-size: 4px 4px;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

@media (prefers-color-scheme: dark) {
    .thks-content-area a {
        color: #3294c2;
        background-color: #3294c2;
        background-image: 
            repeating-linear-gradient(
                0deg,
                transparent,
                transparent 2px,
                rgba(0, 0, 0, 0.08) 2px,
                rgba(0, 0, 0, 0.08) 4px
            ),
            repeating-linear-gradient(
                90deg,
                transparent,
                transparent 2px,
                rgba(0, 0, 0, 0.08) 2px,
                rgba(0, 0, 0, 0.08) 4px
            );
    }
}

body.force-dark .thks-content-area a {
    color: #3294c2;
    background-color: #3294c2;
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.08) 2px,
            rgba(0, 0, 0, 0.08) 4px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.08) 2px,
            rgba(0, 0, 0, 0.08) 4px
        );
}

.thks-content-area a:hover {
    opacity: 0.7;
}

.thks-content-area ul {
    list-style-type: none;
    /* Remove the small top gap so lists align with surrounding content */
    margin: 0 0 16px 0;
    padding: 0;
}

.thks-content-area li {
    /* Match paragraph spacing in `.content` (16px bottom) so the
       credits read like normal paragraphs in HOME */
    margin-bottom: 16px;
    padding-left: 0;
}

.thks-content-area li:before {
    /* Hide default bullets and any pseudo-element markers so list items are not indented */
    display: none;
}

.clock {
    font-family: 'Courier New', 'Courier', monospace;
    font-size: 0.9em;
    font-weight: 600;
    padding: 4px 8px;
    background-color: var(--bg-surface);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    letter-spacing: 1px;
    user-select: none;
    cursor: pointer;
}

.clock-colon {
    animation: blink 1s infinite;
}

.divider {
    color: #6f8000;
    margin: 10px 0;
}

/* Calculator styles */
.calculator {
    max-width: 380px;
    max-height: 600px;
    width: 100%;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.calc-display {
    background-color: #073642;
    border: 3px solid var(--border-color);
    padding: 8px 12px;
    min-height: 0;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    box-shadow: inset 2px 2px 4px rgba(0, 0, 0, 0.3);
    touch-action: manipulation;
    -webkit-user-select: none;
    user-select: none;
}

body.force-light .calc-display {
    background-color: #93a1a1;
}

@media (prefers-color-scheme: light) {
    body:not(.force-dark) .calc-display {
        background-color: #93a1a1;
    }
}

.calc-equation {
    display: none;
}

.calc-result {
    font-size: 0.6em;
    font-weight: bold;
    text-align: right;
    font-family: 'Courier New', Courier, monospace;
    line-height: 1.1;
    white-space: pre;
    overflow: hidden;
    color: #cb4b16;
    text-shadow: 0 0 6px rgba(210, 110, 38, 0.4);
    letter-spacing: 0.05em;
}

@media (prefers-color-scheme: dark) {
    .calc-result {
        color: #2aa198;
        text-shadow: 0 0 8px rgba(42, 161, 152, 0.6);
    }
}

body.force-light .calc-result {
    color: #cb4b16;
    text-shadow: 0 0 6px rgba(210, 78, 38, 0.4);
}

body.force-dark .calc-result {
    color: #2aa198;
    text-shadow: 0 0 8px rgba(42, 161, 152, 0.6);
}

.calc-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

.calc-btn {
    font-family: 'Courier New', 'Courier', monospace;
    font-size: 1.5em;
    font-weight: bold;
    padding: 16px;
    border: 3px solid var(--border-color);
    background-color: var(--bg-surface);
    background-image: 
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.08) 2px,
            rgba(0, 0, 0, 0.08) 4px
        ),
        repeating-linear-gradient(
            -45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.08) 2px,
            rgba(0, 0, 0, 0.08) 4px
        );
    background-size: 4px 4px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.1s;
    box-shadow: 2px 2px 0px var(--border-color);
    touch-action: manipulation;
    user-select: none;
    -webkit-user-select: none;
    -webkit-tap-highlight-color: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 0;
}

.calc-btn:hover {
    background-color: var(--bg-base);
}

.calc-btn:active {
    box-shadow: 0px 0px 0px var(--border-color);
    transform: translate(2px, 2px);
}

.calc-operator {
    background-color: #268bd2;
    background-image: 
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.15) 2px,
            rgba(0, 0, 0, 0.15) 4px
        ),
        repeating-linear-gradient(
            -45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.15) 2px,
            rgba(0, 0, 0, 0.15) 4px
        );
    background-size: 4px 4px;
    color: var(--bg-base);
}

.calc-operator:hover {
    background-color: #1e7bb2;
}

.calc-equals {
    background-color: #859900;
    background-image: 
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.15) 2px,
            rgba(0, 0, 0, 0.15) 4px
        ),
        repeating-linear-gradient(
            -45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.15) 2px,
            rgba(0, 0, 0, 0.15) 4px
        );
    background-size: 4px 4px;
    color: var(--bg-base);
}

.calc-equals:hover {
    background-color: #719e07;
}

.calc-clear {
    background-color: #dc322f;
    background-image: 
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.15) 2px,
            rgba(0, 0, 0, 0.15) 4px
        ),
        repeating-linear-gradient(
            -45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.15) 2px,
            rgba(0, 0, 0, 0.15) 4px
        );
    background-size: 4px 4px;
    color: var(--bg-base);
}

.calc-clear:hover {
    background-color: #cc221f;
}

.calc-wide {
    grid-column: span 2;
}

.calc-tall {
    grid-row: span 2;
}

/* Note styles */
.note-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: 0;
}

.note-text-area {
    flex: 1;
    background-color: var(--bg-base);
    padding: 16px;
    font-family: 'Courier New', 'Courier', monospace;
    font-size: 1.6em;
    font-weight: bold;
    overflow-wrap: break-word;
    word-wrap: break-word;
    white-space: pre-wrap;
    overflow-y: auto;
    box-shadow: inset 2px 2px 4px rgba(0, 0, 0, 0.1);
    line-height: 1.4;
    user-select: none;
    -webkit-user-select: none;
    text-align: left;
    display: flex;
    align-items: flex-start;
    justify-content: flex-start;
    position: relative;
}

.note-text-area > div {
    background-color: var(--text-primary);
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.12) 2px,
            rgba(0, 0, 0, 0.12) 4px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.12) 2px,
            rgba(0, 0, 0, 0.12) 4px
        );
    background-size: 4px 4px;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: var(--text-primary);
}

@media (prefers-color-scheme: dark) {
    .note-text-area > div {
        background-image: 
            repeating-linear-gradient(
                0deg,
                transparent,
                transparent 2px,
                rgba(0, 0, 0, 0.08) 2px,
                rgba(0, 0, 0, 0.08) 4px
            ),
            repeating-linear-gradient(
                90deg,
                transparent,
                transparent 2px,
                rgba(0, 0, 0, 0.08) 2px,
                rgba(0, 0, 0, 0.08) 4px
            );
    }
}

body.force-dark .note-text-area > div {
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.08) 2px,
            rgba(0, 0, 0, 0.08) 4px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.08) 2px,
            rgba(0, 0, 0, 0.08) 4px
        );
}

#noteText {
    word-break: break-word;
}

.note-keyboard {
    height: 35%;
    background-color: var(--text-secondary);
    padding: 6px 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
    border-top: 3px solid var(--border-color);
}

.note-keyboard-row {
    display: flex;
    gap: 2px;
    justify-content: space-between;
    flex: 1;
}

.note-keyboard-row:nth-child(2) .note-key,
.note-keyboard-row:nth-child(3) .note-key {
    flex: 1 1 auto;
}

.note-key {
    flex: 0 0 auto;
    width: calc((100% - (9 * 2px)) / 10);
    min-width: 40px;
    font-family: 'Courier New', 'Courier', monospace;
    font-size: 1em;
    font-weight: bold;
    border: 1px solid var(--border-color);
    background-color: var(--bg-surface);
    background-image: 
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.04) 2px,
            rgba(0, 0, 0, 0.04) 4px
        ),
        repeating-linear-gradient(
            -45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.04) 2px,
            rgba(0, 0, 0, 0.04) 4px
        );
    background-size: 4px 4px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.1s;
    touch-action: manipulation;
    user-select: none;
    -webkit-user-select: none;
    -webkit-tap-highlight-color: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
}

.note-key:hover {
    background-color: var(--bg-base);
}

.note-key:active {
    background-color: var(--text-secondary);
}

.note-key.space {
    flex: 8;
}

.note-key.backspace {
    background-color: #dc322f;
    background-image: 
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.15) 2px,
            rgba(0, 0, 0, 0.15) 4px
        ),
        repeating-linear-gradient(
            -45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.15) 2px,
            rgba(0, 0, 0, 0.15) 4px
        );
    background-size: 4px 4px;
    color: var(--bg-base);
    flex: 2;
    font-size: 1.3em;
}

.note-key.backspace:hover {
    background-color: #cc221f;
}

.note-key.shift {
    background-color: #2aa198;
    background-image: 
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.15) 2px,
            rgba(0, 0, 0, 0.15) 4px
        ),
        repeating-linear-gradient(
            -45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.15) 2px,
            rgba(0, 0, 0, 0.15) 4px
        );
    background-size: 4px 4px;
    color: var(--bg-base);
    flex: 2;
}

.note-key.shift:hover {
    background-color: #239992;
}

.note-key.shift.active {
    background-color: #859900;
    background-image: 
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.15) 2px,
            rgba(0, 0, 0, 0.15) 4px
        ),
        repeating-linear-gradient(
            -45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.15) 2px,
            rgba(0, 0, 0, 0.15) 4px
        );
    background-size: 4px 4px;
}

.note-key.shift.active:hover {
    background-color: #719e07;
}

/* Download icon styles */
.download-icon {
    position: absolute;
    bottom: 0.4rem;
    right: 0.6rem;
    font-size: 2rem;
    font-weight: bold;
    color: var(--text-primary);
    cursor: pointer;
    user-select: none;
    -webkit-user-select: none;
    transition: opacity 0.2s;
    z-index: 10;
    line-height: 1;
}

.download-icon:hover {
    opacity: 0.7;
}

.download-icon:active {
    opacity: 0.5;
}

/* Media queries for short displays - prioritize home page content */
@media (max-height: 700px) {
    .content {
        padding: 16px;
    }
    
    /* Reduce padding further for THKS tab on short screens */
    #thks-content.content {
        padding: 12px;
    }
    
    .ascii-art {
        font-size: 0.6em;
        margin-bottom: 12px;
    }
    
    h1 {
        font-size: 1.3em;
        margin-bottom: 1px;
    }
    
    p {
        margin-bottom: 12px;
    }
}

@media (max-height: 600px) {
    .content {
        padding: 12px;
    }
    
    /* Further reduce padding for THKS tab on very short screens */
    #thks-content.content {
        padding: 8px;
    }
    
    .ascii-art {
        font-size: 0.55em;
        margin-bottom: 8px;
        line-height: 1.1;
    }
    
    h1 {
        font-size: 1.2em;
        margin-bottom: 0;
    }
    
    p {
        margin-bottom: 10px;
        line-height: 1.5;
    }
    
    .divider {
        margin: 6px 0;
    }
}

@media (max-height: 500px) {
    .menu-bar {
        padding: 6px 10px;
        font-size: 0.95em;
    }
    
    .tabs {
        font-size: 0.95em;
    }
    
    .tab {
        padding: 6px 12px;
    }
    
    .content {
        padding: 8px 12px;
    }
    
    /* Minimal padding for THKS tab on extra short screens */
    #thks-content.content {
        padding: 6px 8px;
    }
    
    .ascii-art {
        font-size: 0.5em;
        margin-bottom: 6px;
        line-height: 1.05;
    }
    
    h1 {
        font-size: 1.1em;
        margin-bottom: 0;
        letter-spacing: 2px;
    }
    
    p {
        margin-bottom: 8px;
        line-height: 1.4;
        font-size: 0.95em;
    }
    
    .divider {
        margin: 4px 0;
    }
    
    .footer {
        padding: 6px 10px;
        font-size: 0.85em;
    }
}

@media (max-height: 450px) {
    .menu-bar {
        padding: 4px 8px;
        font-size: 0.9em;
    }
    
    .tabs {
        font-size: 0.9em;
    }
    
    .tab {
        padding: 4px 10px;
    }
    
    .content {
        padding: 6px 10px;
    }
    
    /* Ultra-minimal padding for THKS tab on extremely short screens */
    #thks-content.content {
        padding: 4px 6px;
    }
    
    .ascii-art {
        font-size: 0.45em;
        margin-bottom: 4px;
        line-height: 1.0;
    }
    
    h1 {
        font-size: 1em;
        margin-bottom: 0;
        letter-spacing: 1.5px;
    }
    
    p {
        margin-bottom: 6px;
        line-height: 1.3;
        font-size: 0.9em;
    }
    
    .divider {
        margin: 3px 0;
    }
    
    .footer {
        padding: 4px 8px;
        font-size: 0.8em;
    }
}

@media (max-width: 640px) {
    body {
        padding: 10px;
    }
    
    .container {
        height: calc(100vh - 20px);
        max-height: calc(100vh - 20px);
    }
    
    .ascii-art {
        font-size: 0.5em;
    }
    
    h1 {
        font-size: 1.2em;
    }
    
    .content {
        padding: 16px;
    }
    
    #calc-content.active {
        padding: 24px 16px;
    }

    .tab {
        padding: 8px 12px;
        letter-spacing: 0.5px;
        font-size: 0.95em;
    }

    .calc-btn {
        padding: 12px;
        font-size: 1.3em;
    }

    .calc-result {
        font-size: 0.5em;
    }

    .note-key {
        font-size: 0.9em;
        min-width: 30px;
    }

    .note-text-area {
        font-size: 1.4em;
    }
}

/* Mobile touch devices: use dynamic viewport and top alignment */
@media (max-width: 640px) and (pointer: coarse) and (hover: none) {
    body {
        align-items: flex-start;
        padding-top: 10px;
    }
    
    .container {
        height: calc(100dvh - 20px);
        max-height: calc(100dvh - 20px);
    }
}

/* Combined media queries for short AND narrow screens */
@media (max-width: 640px) and (max-height: 600px) {
    .content {
        padding: 10px;
    }
    
    .ascii-art {
        font-size: 0.45em;
        margin-bottom: 6px;
    }
    
    h1 {
        font-size: 1.1em;
    }
    
    p {
        margin-bottom: 8px;
        font-size: 0.95em;
    }
}

@media (max-width: 640px) and (max-height: 500px) {
    .menu-bar {
        padding: 5px 8px;
    }
    
    .tab {
        padding: 5px 10px;
    }
    
    .content {
        padding: 8px;
    }
    
    .ascii-art {
        font-size: 0.4em;
        margin-bottom: 4px;
        line-height: 1.05;
    }
    
    h1 {
        font-size: 1em;
        letter-spacing: 2px;
    }
    
    p {
        margin-bottom: 6px;
        font-size: 0.9em;
        line-height: 1.3;
    }
    
    .footer {
        padding: 5px 8px;
    }
}

@media (max-width: 400px) {
    .tab {
        padding: 8px 10px;
        letter-spacing: 0.3px;
        font-size: 0.9em;
    }
}

@media (max-width: 350px) {
    .tab {
        padding: 8px 8px;
        letter-spacing: 0px;
        font-size: 0.85em;
    }
}

/* Very short screens - reduce calculator button padding further */
@media (max-height: 600px) {
    .calc-btn {
        padding: 10px;
        font-size: 1.2em;
    }
    
    .calc-display {
        padding: 6px 10px;
    }
    
    .calc-result {
        font-size: 0.5em;
    }
}

/* Extra short screens - minimal padding */
@media (max-height: 500px) {
    .calc-btn {
        padding: 6px;
        font-size: 1em;
    }
    
    .calc-display {
        padding: 4px 8px;
    }
    
    .calc-result {
        font-size: 0.45em;
    }
}

/* Small screens - adjust speed slider */
@media (max-width: 400px) {
    .blok-speed-slider {
        font-size: 12px;
        gap: 3px;
    }
    
    .blok-speed-slider .speed-step {
        padding: 1px 4px;
        min-width: 20px;
    }
}

/* Blok speed slider styles */
.blok-speed-slider {
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 4px;
    font-family: 'Courier New', 'Courier', monospace;
    font-size: 14px;
    font-weight: bold;
    user-select: none;
    z-index: 10;
}

.blok-speed-slider .speed-label {
    color: var(--text-primary);
}

.blok-speed-slider .speed-step {
    cursor: pointer;
    padding: 2px 6px;
    border: 2px solid var(--border-color);
    background-color: var(--bg-surface);
    color: var(--text-primary);
    transition: all 0.2s;
    min-width: 24px;
    text-align: center;
}

.blok-speed-slider .speed-step:hover {
    background-color: var(--bg-base);
}

.blok-speed-slider .speed-step.active {
    background-color: #268bd2;
    background-image: 
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.15) 2px,
            rgba(0, 0, 0, 0.15) 4px
        ),
        repeating-linear-gradient(
            -45deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.15) 2px,
            rgba(0, 0, 0, 0.15) 4px
        );
    background-size: 4px 4px;
    color: var(--bg-base);
    border-color: #268bd2;
}