:root {
    --bg-color: #050608;
    --panel-bg: rgba(15, 18, 25, 0.85);
    --border-color: rgba(255, 255, 255, 0.1);
}

body.protein-bg {
    background-color: var(--bg-color);
    margin: 0;
    overflow: hidden;
    font-family: 'Outfit', sans-serif;
    color: #e2e8f0;
}

.transparent-nav {
    background: transparent !important;
    border-bottom: none !important;
    position: absolute;
    width: 100%;
    z-index: 100;
}

.canvas-wrap {
    position: absolute;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 0;
}

.hud-left {
    position: absolute;
    top: 80px;
    left: 20px;
    width: 320px;
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    padding: 20px;
    border-radius: 12px;
    z-index: 10;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
    transition: transform 0.3s;
}

.hud-right {
    position: absolute;
    top: 80px;
    right: 20px;
    width: 280px;
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    padding: 20px;
    border-radius: 12px;
    z-index: 10;
    transition: transform 0.3s;
}

.hud-hidden-left { transform: translateX(-120%); }
.hud-hidden-right { transform: translateX(120%); }

.amino-picker {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
}

.aa-btn {
    width: 100%;
    aspect-ratio: 1;
    border: 2px solid rgba(255,255,255,0.2);
    background: rgba(0,0,0,0.4);
    color: var(--aa-col, #fff);
    font-weight: 700;
    font-size: 1.1rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}
.aa-btn:hover {
    background: var(--aa-col);
    color: #000;
    border-color: var(--aa-col);
    transform: translateY(-2px);
}
.aa-btn:active { transform: translateY(0); }

.chain-display {
    background: rgba(0,0,0,0.5);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    min-height: 60px;
    font-family: monospace;
    font-size: 1rem;
    word-wrap: break-word;
    letter-spacing: 2px;
    line-height: 1.5;
}

.sequence-item {
    display: inline-block;
    padding: 2px 4px;
    border-radius: 4px;
    margin: 2px;
    font-weight: bold;
    color: #000;
}

.stat-box {
    background: rgba(0,0,0,0.3);
    border: 1px dashed var(--border-color);
    border-radius: 8px;
    padding: 15px;
    text-align: center;
}

.form-range {
    height: 4px;
    appearance: none;
    background: rgba(255,255,255,0.2);
    border-radius: 2px;
    outline: none;
}
.form-range::-webkit-slider-thumb {
    appearance: none;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #3b82f6;
    cursor: pointer;
}