:root {
    --bg-color: #111;
    --panel-bg: rgba(20, 20, 30, 0.7);
    --text-color: #eee;
    --accent-color: #4f8aff;
    --border-color: rgba(255, 255, 255, 0.1);
}

body {
    margin: 0;
    overflow: hidden;
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
}

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

#ui-container {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 320px;
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 24px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    z-index: 1;
    max-height: 90vh;
    overflow-y: auto;
}

h1 {
    font-size: 1.2rem;
    margin-top: 0;
    margin-bottom: 20px;
    text-align: center;
    font-weight: 800;
    background: linear-gradient(90deg, #fff, #aaa);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.input-group {
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

select {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    color: white;
    padding: 6px 12px;
    border-radius: 6px;
    font-family: inherit;
    cursor: pointer;
}

.gear-input {
    background: rgba(255, 255, 255, 0.03);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 12px;
    transition: transform 0.2s;
}

.gear-input:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.05);
}

.gear-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    padding-left: 10px;
}

.gear-header h2 {
    font-size: 0.9rem;
    margin: 0;
    font-weight: 600;
}

.tooth-count {
    font-size: 0.75rem;
    color: #888;
    background: rgba(0, 0, 0, 0.2);
    padding: 2px 6px;
    border-radius: 4px;
}

.input-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.input-row label {
    font-size: 0.8rem;
    color: #aaa;
    width: 50px;
}

input[type="number"] {
    flex: 1;
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 8px;
    color: white;
    font-family: 'Inter', monospace;
    font-size: 0.9rem;
    transition: border-color 0.2s;
}

input[type="number"]:focus {
    outline: none;
    border-color: var(--accent-color);
}

input[readonly] {
    opacity: 0.7;
    cursor: not-allowed;
    border-style: dashed;
}

.info-box {
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
    font-size: 0.8rem;
    color: #888;
}

.info-box p {
    margin: 4px 0;
}

/* Scrollbar */
#ui-container::-webkit-scrollbar {
    width: 6px;
}

#ui-container::-webkit-scrollbar-track {
    background: transparent;
}

#ui-container::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
}