:root {
    /* Gray Steel Theme */
    /* OPTION: Adjust --bg-lit to change background grayness (e.g. 80% = darker, 95% = lighter) */
    --bg-hue: 210;       /* Color Tint (210 = Steel Blue) */
    --bg-sat: 30%;       /* Saturation (0% = Pure Gray) */
    --bg-lit: 30%;       /* Lightness */
    
    --bg-app: hsl(var(--bg-hue), var(--bg-sat), var(--bg-lit));
    --bg-panel: #f6f8fa;
    --bg-element: #eaeef2;
    
    --line: #d0d7de;
    --line-highlight: rgba(255, 255, 255, 0.6);
    
    --text-main: #24292f;
    --text-muted: #57606a;
    
    --accent: #0969da; /* Bright Blue */
    --accent-glow: rgba(9, 105, 218, 0.15);
    
    --good: #1a7f37;
    --warn: #9a6700;
    --danger: #cf222e;
    
    --mono: "JetBrains Mono", monospace;
    --display: "Space Grotesk", sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background-color: var(--bg-app);
    background-image: radial-gradient(circle at 50% 0%, #ffffff 0%, transparent 70%);
    color: var(--text-main);
    font-family: var(--display);
    padding: 1.5rem;
}

.app-shell {
    width: min(1600px, 100%);
    margin: 0 auto;
    min-height: calc(100vh - 3rem);
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 1.5rem;
}

.control-rail {
    background: var(--bg-panel);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25), inset 0 1px 0 var(--line-highlight);
}

.rail-header {
    border-bottom: 1px solid var(--line);
    padding-bottom: 1rem;
    margin-bottom: 0.5rem;
}

.rail-header .eyebrow {
    margin: 0;
    font-family: var(--mono);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.65rem;
    color: var(--text-muted);
}

.rail-header h2 {
    margin: 0.4rem 0 0.6rem;
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.3px;
}

.live-chip {
    display: inline-block;
    font-family: var(--mono);
    font-size: 0.6rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--good);
    background: rgba(87, 171, 90, 0.1);
    border: 1px solid rgba(87, 171, 90, 0.2);
    border-radius: 4px;
    padding: 0.2rem 0.5rem;
}

.rail-section {
    display: grid;
    gap: 0.75rem;
}

.section-title {
    margin: 0;
    font-family: var(--mono);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.65rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.rail-btn {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 6px;
    font-family: var(--mono);
    font-weight: 600;
    font-size: 0.75rem;
    letter-spacing: 0.5px;
    padding: 0.8rem 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    background: var(--bg-element);
    color: var(--text-muted);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.rail-btn:hover {
    border-color: var(--text-muted);
    color: var(--text-main);
    background: #d0d7de;
}

.rail-btn:active {
    transform: translateY(1px);
}

.rail-btn.active {
    border-color: var(--accent);
    background: var(--accent-glow);
    color: var(--accent);
    box-shadow: 0 0 0 1px var(--accent-glow);
}

.rail-btn-mode {
    /* Specific overrides if needed, but generic rail-btn handles it well now */
}

.rail-btn-manual {
    /* Specific overrides if needed */
}

.dashboard {
    display: grid;
    grid-template-rows: auto auto auto 1fr;
    gap: 1.25rem;
}

/* Header Area */
.title-row {
    background: var(--bg-panel);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 1rem 1.5rem;
    display: grid;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1), inset 0 1px 0 var(--line-highlight);
}

.title-row h1 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.5px;
}

.subtitle {
    margin: 0.2rem 0 0;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: var(--mono);
}

#run-state {
    margin: 0;
    font-family: var(--mono);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.7rem;
    border-radius: 4px;
    padding: 0.4rem 0.8rem;
    border: 1px solid rgba(87, 171, 90, 0.3);
    color: var(--good);
    background: rgba(87, 171, 90, 0.1);
    font-weight: 600;
}

#run-state.state-manual {
    border-color: rgba(100, 149, 237, 0.3);
    color: var(--accent);
    background: rgba(100, 149, 237, 0.1);
}

.top-grid {
    display: grid;
    grid-template-columns: 1.1fr 1.1fr 1fr;
    grid-template-rows: auto auto;
    gap: 1rem;
}

.panel {
    background: var(--bg-panel);
    border: 1px solid var(--line);
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1), inset 0 1px 0 var(--line-highlight);
}

.control-card {
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.control-card label,
.control-card span {
    font-family: var(--mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.control-card input {
    width: min(150px, 100%);
    background: var(--bg-element);
    border: 1px solid var(--line);
    color: var(--text-main);
    border-radius: 4px;
    font-family: var(--mono);
    font-size: 0.85rem;
    padding: 0.4rem 0.6rem;
    transition: border-color 0.2s;
}

.control-card input:focus {
    outline: none;
    border-color: var(--accent);
}

.control-span {
    grid-column: 1 / 3;
}

#btn-temp-reg {
    margin-left: auto;
    border: 1px solid var(--accent);
    border-radius: 4px;
    font-family: var(--mono);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    padding: 0.5rem 0.8rem;
    background: rgba(100, 149, 237, 0.1);
    color: var(--accent);
    cursor: pointer;
    transition: all 0.2s ease;
}

#btn-temp-reg:hover {
    background: var(--accent);
    color: #fff;
}

#btn-temp-reg.active {
    border-color: var(--good);
    background: var(--good);
    color: #fff;
}

.movement-card {
    display: block;
    padding: 1rem;
}

.movement-head {
    display: grid;
    gap: 0.2rem;
    margin-bottom: 0.75rem;
}

.movement-head p {
    margin: 0;
    font-family: var(--mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-main);
}

.movement-head span {
    font-family: var(--mono);
    font-size: 0.6rem;
    color: var(--text-muted);
}

.movement-buttons {
    display: flex;
    gap: 0.5rem;
}

.movement-buttons button {
    flex: 1;
    border: 1px solid var(--line);
    border-radius: 4px;
    padding: 0.6rem;
    font-family: var(--mono);
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    color: var(--text-main);
    background: var(--bg-element);
    transition: all 0.2s ease;
}

.movement-buttons button:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.movement-buttons button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    border-color: var(--line);
    color: var(--text-muted);
}

.status-panel {
    grid-column: 3 / 4;
    grid-row: 1 / 3;
    padding: 1rem;
    background: var(--bg-panel);
    display: flex;
    flex-direction: column;
}

.status-panel h2 {
    margin: 0 0 0.75rem;
    font-size: 0.7rem;
    font-family: var(--mono);
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
}

.status-log {
    flex: 1;
    overflow-y: auto;
    border-top: 1px solid var(--line);
    padding-top: 0.5rem;
    display: flex;
    flex-direction: column-reverse;
    gap: 0.4rem;
    font-family: var(--mono);
    font-size: 0.7rem;
    color: var(--text-muted);
}

.status-log p {
    margin: 0;
}

.status-log p.warn {
    color: var(--warn);
}

.status-log p.good {
    color: var(--good);
}

.status-log p.stop {
    color: var(--danger);
}

.metric-strip {
    display: grid;
    grid-template-columns: repeat(3, minmax(160px, 1fr));
    gap: 1rem;
}

.metric {
    background: var(--bg-panel);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1), inset 0 1px 0 var(--line-highlight);
}

.metric p {
    margin: 0;
    color: var(--text-muted);
    font-family: var(--mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.metric strong {
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--text-main);
    margin-left: auto;
}

.metric span {
    color: var(--text-muted);
    font-family: var(--mono);
    font-size: 0.75rem;
}

.chart-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 1rem;
}

.chart-panel {
    padding: 1rem;
    display: flex;
    flex-direction: column;
}

.chart-panel h3 {
    margin: 0 0 0.75rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: var(--mono);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.canvas-wrap {
    position: relative;
    width: 100%;
    min-height: 250px;
    flex: 1;
}

canvas {
    width: 100% !important;
    height: 100% !important;
}

@media (max-width: 1260px) {
    .app-shell {
        grid-template-columns: 1fr;
        height: auto;
    }

    .control-rail {
        display: grid;
        grid-template-columns: 1.2fr 1fr auto;
        align-items: stretch;
    }
}

@media (max-width: 1020px) {
    .top-grid {
        grid-template-columns: 1fr 1fr;
        grid-template-rows: auto auto auto;
    }

    .status-panel {
        grid-column: 1 / 3;
        grid-row: auto;
    }

    .control-span {
        grid-column: 1 / 3;
    }

    .chart-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 820px) {
    body {
        padding: 0.65rem;
    }

    .control-rail {
        grid-template-columns: 1fr;
    }

    .title-row {
        flex-direction: column;
        align-items: flex-start;
    }

    .top-grid {
        grid-template-columns: 1fr;
    }

    .status-panel,
    .control-span {
        grid-column: auto;
    }

    .metric-strip {
        grid-template-columns: 1fr;
    }

    .canvas-wrap {
        min-height: 230px;
    }
}