:root {
    --bg: #0a0a0a;
    --fg: #e0e0e0;
    --muted: #555;
    --border: #2a2a2a;
    --border-light: #1a1a1a;
    --accent: #3a3a5a;
    --error: #e44;
    --link: #58a6ff;
    --indent: 24px;
}

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

body {
    font-family: "Fira Code", "Cascadia Code", "Consolas", monospace;
    background: var(--bg);
    color: var(--fg);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    line-height: 1.6;
    overscroll-behavior: none;
    touch-action: manipulation;
}


header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 48px;
    padding: 0 var(--indent);
    border-bottom: 1px solid var(--border);
    background: #060606;
}

header h1 {
    font-size: 14px;
    font-weight: 700;
    color: var(--fg);
    letter-spacing: 0.5px;
    margin: 0;
}

header nav {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}


.letters_count {
    font-size: 11px;
    color: var(--muted);
    white-space: nowrap;
}


input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 90px;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    background: var(--fg);
    border-radius: 50%;
    border: none;
    transition: 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--accent);
    transform: scale(1.2);
}


select {
    background-color: var(--bg);
    border: 1px solid var(--border);
    color: var(--fg);
    font-family: inherit;
    font-size: 13px;
    padding: 6px 28px 6px 10px;
    outline: none;
    cursor: pointer;
    transition: border-color 0.12s;
    border-radius: 2px;
    max-width: 160px;
}

select:hover {
    border-color: var(--accent);
}


.ctrl-btn,
button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 5px 14px;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--muted);
    font-size: 12px;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.12s;
    border-radius: 2px;
    white-space: nowrap;
}

.ctrl-btn:hover,
button:hover {
    border-color: var(--fg);
    color: var(--fg);
}

.ctrl-btn:active,
button:active {
    transform: scale(0.97);
}


main {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding-top: 80px;
    padding-bottom: 40px;
    min-height: 100vh;
}

.canvas-div {
    text-align: center;
    margin: 16px 0;
}

#displayCanvas {
    background-color: #060606;
    border: 1px solid var(--border);
    border-radius: 4px;
    width: 100%;
    max-width: 400px;
    height: auto;
    aspect-ratio: 4/3;
}


.display-div {
    font-family: "Fira Code", "Cascadia Code", "Consolas", monospace;
    font-size: clamp(1.5rem, 8vw, 2.5rem);
    letter-spacing: 0.4rem;
    margin: 20px 0;
    font-weight: bold;
    color: var(--fg);
    word-break: break-all;
    text-align: center;
}


.keyboard-div {
    margin-top: 12px;
}

.keyboard-row {
    display: flex;
    justify-content: center;
    gap: 6px;
    margin: 6px 0;
    flex-wrap: wrap;
}

.keyboard-div button {
    min-width: 36px;
    height: 44px;
    font-size: clamp(1rem, 4vw, 1.5rem);
    font-weight: bold;
    padding: 0 6px;
    flex: 1 1 auto;
    max-width: 48px;
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--fg);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.12s;
    font-family: inherit;
}

.keyboard-div button:hover:not(:disabled) {
    border-color: var(--accent);
    color: var(--fg);
    background: rgba(58, 58, 90, 0.2);
}

.keyboard-div button:active:not(:disabled) {
    transform: scale(0.96);
}

.keyboard-div button:disabled {
    opacity: 0.2;
    cursor: not-allowed;
    transform: none;
}


.keyboard-div button.correct:disabled {
    opacity: 0.7;
    border-color: var(--accent);
    background: rgba(58, 58, 90, 0.3);
    color: var(--fg);
}




.home-btn,
.add-btn,
.clear-btn {
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--muted);
    padding: 8px 16px;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.1s;
    font-family: inherit;
    letter-spacing: 0.5px;
    font-weight: 500;
}

.home-btn:hover {
    border-color: var(--fg);
    color: var(--fg);
}

.add-btn {
    color: var(--link);
    border-color: #2a2a5a;
    background: #12152a;
}

.add-btn:hover {
    border-color: var(--link);
    color: #aaf;
    background: #1a1f3a;
}

.clear-btn {
    color: var(--error);
    border-color: #5a2a2a;
    background: #2a1215;
}

.clear-btn:hover {
    border-color: #f88;
    color: #faa;
    background: #3a1a1f;
}


footer {
    border-top: 1px solid var(--border);
    padding: 16px var(--indent);
    font-size: 11px;
    color: var(--muted);
    text-align: center;
    background: #060606;
    margin-top: auto;
    position: sticky;
    top: 100vh;
}

footer a {
    color: var(--link);
    text-decoration: none;
    transition: color 0.12s;
}

footer a:hover {
    color: var(--fg);
}


.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--fg);
    color: var(--bg);
    padding: 8px 20px;
    font-size: 13px;
    font-family: inherit;
    border: 1px solid var(--border);
    border-radius: 2px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
    z-index: 9999;
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    visibility: visible;
}


@keyframes slideUp {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes pop {
    50% { transform: scale(0.95); }
}


::-webkit-scrollbar {
    width: 4px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 2px;
}


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


@media (max-width: 560px) {
    :root { --indent: 16px; }

    header {
        padding: 0 12px;
    }

    header nav {
        gap: 6px;
    }

    .ctrl-btn,
    button {
        padding: 4px 10px;
        font-size: 11px;
    }

    .keyboard-div button {
        min-width: 30px;
        height: 40px;
        font-size: 1rem;
        max-width: 40px;
    }

    select {
        max-width: 110px;
        padding: 4px 24px 4px 8px;
        font-size: 12px;
    }
}

@media (max-width: 400px) {
    header h1 {
        font-size: 12px;
    }

    .keyboard-div button {
        min-width: 28px;
        height: 36px;
        font-size: 0.9rem;
    }
}