:root {
    --bg-color: #1e1e2e;
    --surface-color: #313244;
    --text-color: #cdd6f4;
    --primary-color: #89b4fa;
    --secondary-color: #f5c2e7;
    --green-color: #a6e3a1;
    --red-color: #f38ba8;
    --overlay-color: rgba(17, 17, 27, 0.7);
    --key-bg: #45475a;
    --key-special-bg: #585b70;
    --font-family: 'Roboto Mono', monospace;
    --key-base-width: 55px;
    --key-base-height: 55px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { background-color: var(--bg-color); color: var(--text-color); font-family: var(--font-family); display: flex; justify-content: center; align-items: center; min-height: 100vh; overflow: hidden; }

/* Modals & Popups */
.modal-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: var(--overlay-color); display: flex; justify-content: center; align-items: center; z-index: 1000; opacity: 0; visibility: hidden; transition: opacity 0.3s ease, visibility 0s 0.3s; }
.modal-overlay.show { opacity: 1; visibility: visible; transition: opacity 0.3s ease; }
.modal-content { background-color: var(--surface-color); padding: 30px 40px; border-radius: 12px; box-shadow: 0 10px 30px rgba(0,0,0,0.3); text-align: center; position: relative; transform: scale(0.9); animation: modal-pop-in 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards; }
@keyframes modal-pop-in { from { transform: scale(0.9); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.modal-content.wide { max-width: 800px; }
.modal-content.wide-editor { max-width: 1100px; }
.modal-content h2 { margin-bottom: 15px; color: var(--primary-color); }
.modal-content .close-btn { position: absolute; top: 10px; right: 15px; background: none; border: none; color: var(--text-color); font-size: 28px; cursor: pointer; transition: color 0.2s; }
.modal-content .close-btn:hover { color: var(--red-color); }
.layout-options { display: flex; flex-wrap: wrap; gap: 15px; justify-content: center; }
.config-actions { display: flex; gap: 15px; justify-content: center; margin-top: 25px; }
.layout-btn, .config-actions button, .controls-right button { padding: 10px 20px; font-size: 14px; font-family: var(--font-family); border: 2px solid var(--primary-color); background-color: transparent; color: var(--primary-color); border-radius: 8px; cursor: pointer; transition: background-color 0.3s, color 0.3s, transform 0.2s; }
.layout-btn:hover, .config-actions button:hover, .controls-right button:hover { background-color: var(--primary-color); color: var(--bg-color); transform: translateY(-2px); }
.custom-layout-container { margin-top: 25px; width: 100%; }
.layout-btn.special-btn { border-color: var(--secondary-color); color: var(--secondary-color); }
.layout-btn.special-btn:hover { background-color: var(--secondary-color); color: var(--bg-color); }
.instructions { margin-bottom: 20px; line-height: 1.6; color: var(--text-color); opacity: 0.9; }

/* App Main Container */
#app-container { width: 95vw; max-width: 1400px; height: 95vh; display: flex; flex-direction: column; gap: 15px; opacity: 0; transform: translateY(20px); transition: opacity 0.5s ease, transform 0.5s ease; }
#app-container:not(.hidden) { opacity: 1; transform: translateY(0); }
.hidden { display: none !important; }

/* Header & Controls */
header { background-color: var(--surface-color); padding: 15px 25px; border-radius: 10px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 15px; }
.controls-left, .controls-right { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
.control-group { display: flex; align-items: center; gap: 10px; }
label { font-size: 14px; }
select, input[type="range"] { background-color: var(--bg-color); color: var(--text-color); border: 1px solid var(--primary-color); border-radius: 5px; padding: 5px; font-family: var(--font-family); }
#config-btn { border-color: var(--secondary-color); color: var(--secondary-color); }
#config-btn:hover { background-color: var(--secondary-color); color: var(--bg-color); }
.toggle-switch { position: relative; display: inline-block; width: 50px; height: 26px; }
.toggle-switch input { display: none; }
.toggle-switch .slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: #555; transition: .4s; border-radius: 26px; }
.toggle-switch .slider:before { position: absolute; content: ""; height: 20px; width: 20px; left: 3px; bottom: 3px; background-color: white; transition: .4s; border-radius: 50%; }
.toggle-switch input:checked + .slider { background-color: var(--green-color); }
.toggle-switch input:checked + .slider:before { transform: translateX(24px); }
.toggle-label { cursor: pointer; }

/* Main Content (Word Display) */
main { flex-grow: 1; display: flex; flex-direction: column; justify-content: center; align-items: center; position: relative; }
#typing-area { display: flex; flex-direction: column; align-items: center; }
#word-display-container { position: relative; padding: 20px; background-color: var(--surface-color); border-radius: 10px; cursor: text; }
#word-display { font-size: 3rem; letter-spacing: 4px; display: flex; user-select: none; }
#word-display span { transition: color 0.2s, text-shadow 0.2s; border-bottom: 3px solid transparent; }
#word-display span.current { border-bottom-color: var(--primary-color); animation: blink 1s infinite; }
@keyframes blink { 0%, 100% { border-bottom-color: var(--primary-color); } 50% { border-bottom-color: transparent; } }
#word-display span.correct { color: var(--green-color); }
#word-display span.incorrect { color: var(--red-color); text-shadow: 0 0 5px var(--red-color); }
#hidden-input { position: absolute; top: 0; left: 0; width: 100%; height: 100%; opacity: 0; z-index: -1; }
#reset-word-btn { position: absolute; top: 50%; right: -60px; transform: translateY(-50%); font-size: 2rem; background: none; border: none; color: var(--text-color); cursor: pointer; opacity: 0.5; transition: opacity 0.3s, transform 0.3s; }
#reset-word-btn:hover { opacity: 1; transform: translateY(-50%) rotate(360deg); }

#define-word-btn {
    margin-top: 15px;
    background: none;
    border: 1px solid rgba(205, 214, 244, 0.3);
    color: var(--text-color);
    font-family: var(--font-family);
    padding: 5px 12px;
    border-radius: 6px;
    font-size: 0.8rem;
    cursor: pointer;
    opacity: 0.7;
    transition: all 0.2s ease;
}
#define-word-btn:hover {
    opacity: 1;
    background-color: var(--surface-color);
    border-color: var(--primary-color);
}

/* Footer & WPM Layout */
footer {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: end;
    width: 100%;
    gap: 20px;
    padding: 0 20px 20px 20px;
}
.footer-left-space { display: flex; justify-content: center; align-items: center; flex-direction: column; }
.footer-right-space { /* Empty spacer */ }
#wpm-container { text-align: center; }
#wpm-graph { background-color: var(--surface-color); border-radius: 8px; display: block; }
#wpm-display { margin-top: 8px; font-size: 14px; color: var(--primary-color); }

/* Keyboard Styling */
#keyboard, #custom-layout-editor-keyboard { padding: 20px; background-color: var(--surface-color); border-radius: 10px; display: flex; flex-direction: column; gap: 10px; }
.keyboard-row { display: flex; gap: 10px; justify-content: center; }
.keyboard-row[data-row="1"] { margin-left: calc(var(--key-base-width) / 2.5); }
.keyboard-row[data-row="2"] { margin-left: calc(var(--key-base-width) / 1.5); }
.keyboard-row[data-row="3"] { margin-left: calc(var(--key-base-width) * 1.25); }
.key { height: var(--key-base-height); width: var(--key-base-width); display: flex; justify-content: center; align-items: center; background-color: var(--key-bg); border-radius: 8px; font-size: 1.1rem; user-select: none; transition: background-color 0.2s, transform 0.1s, border-color 0.2s, box-shadow 0.2s; border: 2px solid transparent; }
.key.char { cursor: pointer; }
.key.char:hover { background-color: #6c7086; }
.key.special { background-color: var(--key-special-bg); font-size: 0.9rem; cursor: default; }
.key[data-size="1.25"] { width: calc(var(--key-base-width) * 1.25); }
.key[data-size="1.5"] { width: calc(var(--key-base-width) * 1.5); }
.key[data-size="1.75"] { width: calc(var(--key-base-width) * 1.75); }
.key[data-size="2"] { width: calc(var(--key-base-width) * 2); }
.key[data-size="2.25"] { width: calc(var(--key-base-width) * 2.25); }
.key[data-size="grow"] { flex-grow: 1; }
.key.active { background-color: var(--primary-color); color: var(--bg-color); font-weight: bold; }
.key.pressed { transform: scale(0.95); background-color: var(--secondary-color); }
#custom-layout-editor-keyboard .key.char:hover { border-color: var(--secondary-color); }
.key.editing { border-color: var(--secondary-color); box-shadow: 0 0 12px 3px var(--secondary-color); transform: scale(1.05); }