@import url('https://fonts.googleapis.com/css2?family=Roboto+Mono:wght@400;700&display=swap');

:root {
    --color-bg:             #0d0d1a;
    --color-primary:        #00aaff;
    --color-primary-dim:    #0055aa;
    --color-primary-bright: #88ddff;
    --color-accent:         #ffaa00;
    --color-accent-dim:     #aa7700;
    --color-text:           #e0e0e0;
    --color-text-dim:       #888888;
    --font-mono: 'Roboto Mono', monospace;
}

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body, html {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-mono);
    font-size: 13px;
    letter-spacing: 1px;
}

/* ── Three.js container fills full viewport ──────────── */
#container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

#container canvas {
    display: block;
}

/* ── Control panel — fixed overlay ───────────────────── */
.control-panel {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 10;
    background: rgba(13, 13, 26, 0.90);
    border-right: 1px solid var(--color-primary-dim);
    border-bottom: 1px solid var(--color-primary-dim);
    box-shadow: 2px 2px 20px rgba(0, 170, 255, 0.12),
                inset 0 0 30px rgba(0, 0, 0, 0.4);
    min-width: 270px;
    max-width: 310px;
}

.panel-title {
    background: var(--color-primary-dim);
    color: var(--color-primary-bright);
    padding: 5px 12px;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 2px;
    text-shadow: 0 0 8px rgba(0, 170, 255, 0.6);
    border-bottom: 1px solid var(--color-primary);
}

.panel-body {
    padding: 10px 12px 12px;
}

/* ── Parameter rows ───────────────────────────────────── */
.param-rows {
    display: flex;
    flex-direction: column;
    gap: 7px;
    margin-bottom: 10px;
}

.param-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.param-label {
    color: var(--color-primary-bright);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1px;
    min-width: 40px;
    text-align: right;
}

.param-value {
    color: var(--color-accent);
    font-size: 11px;
    min-width: 46px;
    text-align: right;
    letter-spacing: 0;
    text-shadow: 0 0 6px rgba(255, 170, 0, 0.5);
}

/* ── Checkbox ────────────────────────────────────────── */
.checkbox-wrap {
    display: flex;
    align-items: center;
    gap: 7px;
    cursor: pointer;
    flex: 1;
}

.checkbox-wrap input[type="checkbox"] {
    accent-color: var(--color-primary);
    width: 13px;
    height: 13px;
    cursor: pointer;
    flex-shrink: 0;
}

.checkbox-label {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--color-primary);
}

/* ── Section divider ─────────────────────────────────── */
.section-divider {
    height: 1px;
    background: var(--color-primary-dim);
    opacity: 0.4;
    margin: 4px 0;
}

/* ── Select dropdown ─────────────────────────────────── */
select {
    flex: 1;
    background: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-primary-dim);
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1px;
    padding: 3px 4px;
    cursor: pointer;
    outline: none;
    appearance: none;
    -webkit-appearance: none;
}

select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 6px rgba(0, 170, 255, 0.35);
}

select option {
    background: #0d0d1a;
    color: var(--color-primary);
}

/* ── Range sliders ───────────────────────────────────── */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    flex: 1;
    height: 3px;
    background: var(--color-primary-dim);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 13px;
    height: 13px;
    border-radius: 50%;
    background: var(--color-primary);
    box-shadow: 0 0 6px rgba(0, 170, 255, 0.8);
    cursor: pointer;
    transition: background 0.15s, box-shadow 0.15s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--color-primary-bright);
    box-shadow: 0 0 10px rgba(136, 221, 255, 1);
}

input[type="range"]::-moz-range-thumb {
    width: 13px;
    height: 13px;
    border-radius: 50%;
    background: var(--color-primary);
    box-shadow: 0 0 6px rgba(0, 170, 255, 0.8);
    cursor: pointer;
    border: none;
}

/* ── Buttons ─────────────────────────────────────────── */
.button-group {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

button {
    flex: 1;
    padding: 5px 6px;
    background: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-primary-dim);
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1px;
    cursor: pointer;
    transition: color 0.15s, border-color 0.15s, box-shadow 0.15s, background 0.15s;
}

button:hover {
    color: var(--color-primary-bright);
    border-color: var(--color-primary);
    box-shadow: 0 0 8px rgba(0, 170, 255, 0.4);
}

button:active {
    background: var(--color-primary-dim);
    color: var(--color-bg);
}

button.btn-accent {
    color: var(--color-accent);
    border-color: var(--color-accent-dim);
}

button.btn-accent:hover {
    color: #ffcc44;
    border-color: var(--color-accent);
    box-shadow: 0 0 8px rgba(255, 170, 0, 0.45);
}

button.btn-accent:active {
    background: var(--color-accent);
    color: var(--color-bg);
}