*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
:root {
    --bg: #071018;
    --panel-w: 360px;
    --panel-bg: rgba(0, 0, 0, 0.04);
    --panel-border: rgba(255, 255, 255, 0.06);
    --text: #dfeaf2;
    --muted: #98a7b1;
    --accent: #ffffffcc;
    --mono: "JetBrains Mono", monospace;
    --sans: "Syne", sans-serif;
}
html,
body {
    height: 100%;
}
body {
    font-family: var(--sans);
    background: var(--bg);
    color: var(--text);
    overflow: hidden;
}
canvas {
    display: block;
    width: 100vw;
    height: 100vh;
}

#toggle-btn {
    position: fixed;
    top: 14px;
    right: 14px;
    z-index: 200;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    border: 1px solid var(--panel-border);
    background: transparent;
    color: var(--text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
}

#panel {
    position: fixed;
    right: 0;
    top: 0;
    height: 100vh;
    width: var(--panel-w);
    background: var(--panel-bg);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    border-left: 1px solid var(--panel-border);
    z-index: 150;
    transform: translateX(100%);
    transition: transform 0.28s ease;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
#panel.open {
    transform: translateX(0);
}
.panel-inner {
    display: flex;
    flex-direction: column;
    height: 100%;
}
.panel-header {
    padding: 16px;
    border-bottom: 1px solid var(--panel-border);
    flex-shrink: 0;
}
.panel-title {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--accent);
    margin-bottom: 8px;
    font-family: var(--sans);
}
.controls-row {
    display: flex;
    gap: 8px;
    align-items: center;
}
.btn {
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid var(--panel-border);
    background: transparent;
    color: var(--text);
    cursor: pointer;
    font-weight: 600;
}
.btn-primary {
    background: rgba(255, 255, 255, 0.03);
}
.panel-body {
    padding: 12px;
    overflow: auto;
    flex: 1;
}

.repo-link {
    font-size: 13px;
    color: var(--muted);
    margin-bottom: 6px;
}
.repo-link a {
    color: var(--muted);
    text-decoration: underline;
}
.experiment-desc {
    font-size: 13px;
    color: var(--muted);
    margin-bottom: 10px;
}

.section-label {
    font-size: 11px;
    color: var(--muted);
    margin: 10px 0 6px;
}
.create-custom-btn {
    width: 100%;
    padding: 10px;
    border-radius: 8px;
    border: 1px dashed var(--panel-border);
    background: transparent;
    color: var(--muted);
    font-weight: 600;
    margin-bottom: 12px;
}

.gen-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.gen-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px;
    border-radius: 8px;
    border: 1px solid transparent;
    cursor: pointer;
}
.gen-item:hover {
    background: rgba(255, 255, 255, 0.02);
    border-color: var(--panel-border);
}
.gen-item.active {
    background: rgba(255, 255, 255, 0.03);
    border-color: var(--panel-border);
}
.gen-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--muted);
}
.gen-item.active .gen-dot {
    background: var(--accent);
}
.gen-name {
    flex: 1;
    font-weight: 600;
}
.gen-tag {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--muted);
    padding: 2px 6px;
    border-radius: 6px;
    border: 1px solid transparent;
}

.editor-section {
    display: none;
    flex-direction: column;
    gap: 8px;
    margin-top: 10px;
}
.editor-section.visible {
    display: flex;
}
.code-editor {
    width: 100%;
    min-height: 220px;
    border-radius: 8px;
    border: 1px solid var(--panel-border);
    background: transparent;
    color: var(--text);
    padding: 10px;
    font-family: var(--mono);
    font-size: 12px;
    resize: vertical;
}
.error-box {
    display: none;
    color: #ffb3b3;
    font-size: 13px;
    margin-top: 6px;
}
.error-box.visible {
    display: block;
}
.success-flash {
    display: none;
    color: #b7f0c7;
    font-size: 13px;
    margin-top: 6px;
}
.divider {
    height: 1px;
    background: var(--panel-border);
    margin: 12px 0;
}
#reset-btn {
    display: none;
}

#toggle-btn svg {
    transition: transform 0.18s ease;
}
#toggle-btn.active svg {
    transform: rotate(180deg);
}

.speed-legend {
    margin-top: 12px;
}
.speed-legend .speed-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 6px;
}
#max-speed {
    flex: 1;
    height: 6px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 6px;
    appearance: none;
}
#max-speed::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: rgba(80, 80, 86, 0.9);
    border: none;
}
#max-speed::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: rgba(80, 80, 86, 0.9);
    border: none;
}
#max-speed:focus {
    outline: none;
}
.speed-label {
    font-size: 12px;
    margin-right: 8px;
    color: var(--muted);
}
.speed-value {
    min-width: 36px;
    text-align: right;
    color: var(--muted);
}

/* Scrollbar styling: dark grey thumb, transparent track */
/* WebKit browsers (Chrome, Edge, Safari) */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(80, 80, 86, 0.6);
    border-radius: 8px;
    border: 2px solid transparent;
    background-clip: padding-box;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(80, 80, 86, 0.85);
}

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: rgba(80, 80, 86, 0.6) transparent;
}