/* style.css — Dark scientific UI theme */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --bg: #0f1520;
    --panel: #1a1f2e;
    --panel-border: #2a3045;
    --accent: #4a8b7f;
    --accent-glow: #5cb8a8;
    --text: #c8cdd8;
    --text-dim: #6b7280;
    --text-bright: #e8ecf2;
    --danger: #c04040;
    --warning: #c09040;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    font-size: 13px;
    overflow: hidden;
    height: 100vh;
}

/* Layout */
.app {
    display: grid;
    grid-template-rows: 44px 1fr 32px;
    grid-template-columns: 200px 1fr 210px;
    height: 100vh;
    gap: 1px;
    background: var(--panel-border);
}

/* Header */
.header {
    grid-column: 1 / -1;
    background: var(--panel);
    display: flex;
    align-items: center;
    padding: 0 16px;
    gap: 16px;
}

.header h1 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-bright);
    letter-spacing: 0.3px;
}

.header .controls {
    display: flex;
    gap: 6px;
    margin-left: auto;
}

.header .controls button {
    background: var(--panel-border);
    border: 1px solid #3a4060;
    color: var(--text);
    padding: 4px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 13px;
    transition: all 0.15s;
}

.header .controls button:hover {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

#fps-display {
    color: var(--text-dim);
    font-size: 11px;
    font-variant-numeric: tabular-nums;
    min-width: 50px;
    text-align: right;
}

/* Panels */
.panel {
    background: var(--panel);
    padding: 12px;
    overflow-y: auto;
}

.panel h3 {
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--accent);
    margin-bottom: 8px;
    padding-bottom: 4px;
    border-bottom: 1px solid var(--panel-border);
}

.panel h3:not(:first-child) {
    margin-top: 16px;
}

/* Canvas area */
.canvas-wrap {
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
    position: relative;
}

#sim-canvas {
    width: 100%;
    height: 100%;
    object-fit: contain;
    image-rendering: auto;
    border-radius: 4px;
    cursor: crosshair;
}

#rain-canvas {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: calc(100% - 16px);
    height: calc(100% - 16px);
    object-fit: contain;
    pointer-events: none;
    border-radius: 4px;
}

/* Status bar */
.status-bar {
    grid-column: 1 / -1;
    background: var(--panel);
    display: flex;
    align-items: center;
    padding: 0 16px;
    gap: 24px;
    font-size: 11px;
    font-variant-numeric: tabular-nums;
    color: var(--text-dim);
}

.status-bar span {
    white-space: nowrap;
}

.status-bar .storm-active {
    color: var(--warning);
    font-weight: 600;
}

/* Tool buttons */
.tool-btn {
    display: block;
    width: 100%;
    padding: 6px 10px;
    margin-bottom: 4px;
    background: var(--bg);
    border: 1px solid var(--panel-border);
    color: var(--text);
    border-radius: 4px;
    cursor: pointer;
    text-align: left;
    font-size: 12px;
    transition: all 0.15s;
}

.tool-btn:hover { border-color: var(--accent); }
.tool-btn.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

/* Radio groups */
.radio-group label {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 3px 0;
    cursor: pointer;
    font-size: 12px;
}

.radio-group input[type="radio"],
.radio-group input[type="checkbox"] {
    accent-color: var(--accent);
}

/* Sliders */
.slider-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
}

.slider-row label {
    font-size: 11px;
    color: var(--text-dim);
    min-width: 60px;
}

.slider-row input[type="range"] {
    flex: 1;
    height: 4px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--panel-border);
    border-radius: 2px;
    outline: none;
}

.slider-row input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
}

.slider-row .value {
    font-size: 11px;
    color: var(--text-dim);
    min-width: 28px;
    text-align: right;
    font-variant-numeric: tabular-nums;
}

/* Storm buttons */
.storm-btn {
    display: block;
    width: 100%;
    padding: 6px 10px;
    margin-bottom: 4px;
    background: #1a2535;
    border: 1px solid #2a4060;
    color: #7ab0d0;
    border-radius: 4px;
    cursor: pointer;
    font-size: 11px;
    transition: all 0.15s;
}

.storm-btn:hover {
    background: #1a3550;
    border-color: #4a90c0;
}

/* Preset select */
select {
    width: 100%;
    padding: 6px 8px;
    background: var(--bg);
    border: 1px solid var(--panel-border);
    color: var(--text);
    border-radius: 4px;
    font-size: 12px;
    cursor: pointer;
}

select:focus { border-color: var(--accent); outline: none; }

/* Tooltip */
#tooltip {
    display: none;
    position: fixed;
    background: rgba(15, 20, 30, 0.95);
    border: 1px solid var(--panel-border);
    padding: 8px 10px;
    border-radius: 4px;
    font-size: 11px;
    line-height: 1.5;
    white-space: pre;
    pointer-events: none;
    z-index: 100;
    font-variant-numeric: tabular-nums;
    color: var(--text);
    backdrop-filter: blur(8px);
}

/* Speed display */
#speed-display {
    font-size: 11px;
    color: var(--accent);
    font-weight: 600;
}

/* Scrollbar styling */
.panel::-webkit-scrollbar { width: 4px; }
.panel::-webkit-scrollbar-track { background: transparent; }
.panel::-webkit-scrollbar-thumb { background: var(--panel-border); border-radius: 2px; }