* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, sans-serif;
}

body {
    overflow: hidden;
    background: #ffffff;
    color: #111111;
}

#canvas-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1;
}

#ui-panel {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 300px;
    background: #ffffff;
    border: 2px solid #000000;
    padding: 20px;
    z-index: 10;
    display: flex;
    flex-direction: column;
    gap: 16px;
    box-shadow: 4px 4px 0px #000000;
}

h1 {
    font-size: 1.25rem;
    font-weight: 800;
    text-align: left;
    text-transform: uppercase;
    letter-spacing: -0.5px;
}

button {
    background: #ffffff;
    color: #000000;
    border: 2px solid #000000;
    padding: 8px 12px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.1s;
    box-shadow: 2px 2px 0px #000000;
}

button:hover {
    background: #f0f0f0;
}

button:active {
    transform: translate(2px, 2px);
    box-shadow: 0px 0px 0px #000000;
}

.primary-btn {
    background: #000000;
    color: #ffffff;
    width: 100%;
}

.primary-btn:hover {
    background: #222222;
}

.controls-group, .solver-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.controls-group {
    flex-direction: row;
}


.controls-group button {
    flex: 1;
}

label {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
}

select {
    width: 100%;
    padding: 8px;
    background: #ffffff;
    color: #000000;
    border: 2px solid #000000;
    outline: none;
    cursor: pointer;
    font-weight: 600;
    box-shadow: 2px 2px 0px #000000;
    transition: all 0.1s;
    appearance: none;
    border-radius: 0;
}

select:focus {
    transform: translate(2px, 2px);
    box-shadow: 0px 0px 0px #000000;
}

#solution-output {
    margin-top: 8px;
    border-top: 2px solid #000000;
    padding-top: 16px;
}

#solution-output.hidden {
    display: none;
}

#solution-output h3 {
    font-size: 0.9rem;
    margin-bottom: 12px;
    text-transform: uppercase;
}

#solution-text {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 16px;
    max-height: 250px;
    overflow-y: auto;
}

.move-btn {
    background: #ffffff;
    border: 2px solid #000000;
    padding: 4px 8px;
    font-family: monospace;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    box-shadow: 2px 2px 0px #000000;
}

.move-btn:hover {
    background: #e2e8f0;
}

.move-btn:active {
    transform: translate(2px, 2px);
    box-shadow: 0px 0px 0px #000000;
}

.move-btn.active {
    background: #000000;
    color: #ffffff;
}

.step-marker {
    width: 100%;
    font-size: 0.8rem;
    font-weight: 800;
    text-transform: uppercase;
    margin-top: 8px;
    margin-bottom: 4px;
    color: #444;
}

.playback-controls {
    display: flex;
    gap: 8px;
}

.playback-controls button {
    flex: 1;
}

.manual-controls {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    text-align: center;
    border-top: 2px solid #000000;
    padding-top: 16px;
}

.settings-group {
    background: #ffffff;
    border: 2px solid #000;
    padding: 12px;
    margin-top: 16px;
    box-shadow: 4px 4px 0 #000;
}
.settings-group summary {
    font-size: 0.9rem;
    font-weight: 800;
    text-transform: uppercase;
    cursor: pointer;
    outline: none;
    user-select: none;
}
.settings-content {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 12px;
    border-top: 2px solid #000;
    padding-top: 12px;
}
.settings-content label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
}
.settings-content select {
    width: 140px;
    appearance: none;
    -webkit-appearance: none;
    background-color: #ffffff;
    border: 2px solid #000000;
    padding: 8px 12px;
    font-family: inherit;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    border-radius: 0;
    cursor: pointer;
    box-shadow: 2px 2px 0 #000000;
    background-image: url('data:image/svg+xml;utf8,<svg width="10" height="6" viewBox="0 0 10 6" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M1 1L5 5L9 1" stroke="black" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/></svg>');
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 30px;
    color: #000000;
    transition: transform 0.1s, box-shadow 0.1s;
}

.settings-content select:focus {
    outline: none;
    background-color: #f1f5f9;
}

.settings-content select:active {
    transform: translate(2px, 2px);
    box-shadow: 0px 0px 0px #000000;
}