:root {
    --bg-dark:    #0d1117;
    --bg-widget:  #161b22;
    --border:     #30363d;
    --accent:     #58a6ff;
    --accent-glow: rgba(88, 166, 255, 0.3);
    --text-main:  #c9d1d9;
    --text-muted: #8b949e;
    --good:       #3fb950;
    --warn:       #f9a825;
    --danger:     #f85149;
    --purple:     #a371f7;
    --mono: 'Fira Code', monospace;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    background: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--mono);
    padding: 1.5rem;
}

.panel {
    background: var(--bg-widget);
    border: 1px solid var(--border);
    border-radius: 6px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.panel:hover {
    border-color: var(--accent);
    box-shadow: 0 0 12px var(--accent-glow);
}

/* ── THREE-COLUMN SHELL ── */
.app-shell {
    width: min(1600px, 100%);
    margin: 0 auto;
    min-height: calc(100vh - 3rem);
    display: grid;
    grid-template-columns: 185px 1fr 255px;
    gap: 1.25rem;
    align-items: stretch;
}

/* ══════════════════════════════════════════
   LEFT COLUMN: PROBE VISUALIZER
══════════════════════════════════════════ */
.probe-column {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.probe-header {
    padding: 0.9rem 1rem;
    text-align: center;
}

.eyebrow {
    margin: 0 0 0.35rem;
    font-size: 0.58rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--text-muted);
}

.height-display {
    margin: 0;
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.3rem;
}

.height-display span {
    font-size: 1.65rem;
    font-weight: 600;
    color: var(--accent);
    text-shadow: 0 0 14px var(--accent-glow);
}

.height-display em {
    font-style: normal;
    font-size: 0.78rem;
    color: var(--text-muted);
}

/* vessel section */
.vessel-section {
    flex: 1;
    padding: 1rem 0.85rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    min-height: 0;
}

.vessel-wrap {
    flex: 1;
    display: flex;
    gap: 8px;
    align-items: stretch;
    min-height: 0;
}

.scale-labels {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    font-size: 0.57rem;
    color: var(--text-muted);
    text-align: right;
    padding-right: 6px;
    border-right: 1px solid var(--border);
    min-width: 24px;
    padding-top: 2px;
    padding-bottom: 2px;
}

.vessel {
    flex: 1;
    position: relative;
    border: 1.5px solid var(--border);
    border-top: none;
    border-radius: 0 0 16px 16px;
    background: var(--bg-dark);
    overflow: hidden;
    min-height: 180px;
}

/* dashed open-top indicator */
.vessel::before {
    content: '';
    position: absolute;
    top: 0;
    left: -2px;
    right: -2px;
    height: 1px;
    background: repeating-linear-gradient(
        90deg,
        var(--border) 0, var(--border) 4px,
        transparent 4px, transparent 8px
    );
}

.vessel-liquid {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 56%;
    background: linear-gradient(
        to top,
        rgba(88, 166, 255, 0.1),
        rgba(88, 166, 255, 0.02)
    );
    border-top: 1px dashed rgba(88, 166, 255, 0.22);
}

.probe-rod {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 7px;
    background: linear-gradient(to bottom, var(--accent), rgba(88, 166, 255, 0.5));
    border-radius: 3px 3px 0 0;
    box-shadow: 0 0 10px var(--accent-glow);
    transition: top 0.4s ease;
}

.probe-tip {
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 0; height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 8px solid rgba(88, 166, 255, 0.6);
}

.temp-aura {
    position: absolute;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    left: 50%;
    transform: translateX(-50%);
    pointer-events: none;
    opacity: 0;
    background: radial-gradient(circle, rgba(249, 168, 37, 0.3) 0%, transparent 70%);
    transition: top 0.4s ease, opacity 0.7s;
}

.temp-aura.active {
    opacity: 1;
    animation: aura-pulse 1.6s ease-in-out infinite;
}

@keyframes aura-pulse {
    0%, 100% { transform: translateX(-50%) scale(1);    opacity: 0.85; }
    50%       { transform: translateX(-50%) scale(1.45); opacity: 0.35; }
}

.vessel-label {
    margin: 0;
    font-size: 0.58rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    text-align: center;
}

/* probe controls */
.probe-controls {
    padding: 0.9rem;
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.mode-btn {
    width: 100%;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-family: var(--mono);
    font-size: 0.66rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    padding: 0.65rem 0.75rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: all 0.2s;
}

.mode-btn:hover { border-color: var(--accent); color: var(--text-main); }

.mode-btn.active {
    border-color: var(--accent);
    background: rgba(88, 166, 255, 0.1);
    color: var(--accent);
    box-shadow: 0 0 8px var(--accent-glow);
}

.jog-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0.5rem; }

.jog-btn {
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.5rem 0;
    font-family: var(--mono);
    font-size: 0.68rem;
    font-weight: 600;
    cursor: pointer;
    color: var(--text-main);
    transition: all 0.2s;
}

.jog-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: 0 0 8px var(--accent-glow);
}

.jog-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
    border-color: var(--border);
    color: var(--text-muted);
    box-shadow: none;
}

.step-row {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.step-row label { font-size: 0.66rem; color: var(--text-muted); }

.step-row input {
    flex: 1;
    min-width: 0;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    color: var(--text-main);
    border-radius: 4px;
    font-family: var(--mono);
    font-size: 0.78rem;
    padding: 0.35rem 0.45rem;
    transition: border-color 0.2s;
}

.step-row input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 6px var(--accent-glow);
}

.step-row span { font-size: 0.66rem; color: var(--text-muted); }

/* ══════════════════════════════════════════
   CENTER COLUMN: CHARTS
══════════════════════════════════════════ */
.chart-column {
    display: grid;
    grid-template-rows: auto 1fr auto;
    gap: 1rem;
    min-height: calc(100vh - 3rem);
}

.title-bar {
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.title-bar h1 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-main);
}

.subtitle {
    margin: 0.2rem 0 0;
    font-size: 0.72rem;
    color: var(--text-muted);
}

.scan-status-group {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.55rem;
    flex-shrink: 0;
}

/* scan phase badge */
.scan-phase-badge {
    font-size: 0.63rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--warn);
    background: rgba(249, 168, 37, 0.1);
    border: 1px solid rgba(249, 168, 37, 0.3);
    border-radius: 4px;
    padding: 0.28rem 0.65rem;
    transition: all 0.4s;
    white-space: nowrap;
}

.scan-phase-badge.phase-ok {
    color: var(--good);
    background: rgba(63, 185, 80, 0.1);
    border-color: rgba(63, 185, 80, 0.3);
}

.scan-phase-badge.phase-danger {
    color: var(--danger);
    background: rgba(248, 81, 73, 0.1);
    border-color: rgba(248, 81, 73, 0.3);
}

.scan-phase-badge.phase-complete {
    color: var(--purple);
    background: rgba(163, 113, 247, 0.1);
    border-color: rgba(163, 113, 247, 0.3);
}

.scan-phase-badge.phase-muted {
    color: var(--text-muted);
    background: transparent;
    border-color: var(--border);
}

/* progress bar */
.scan-progress-wrap {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    min-width: 210px;
}

.progress-temps {
    display: flex;
    justify-content: space-between;
    font-size: 0.58rem;
    color: var(--text-muted);
}

.progress-track {
    height: 5px;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(to right, var(--accent) 0%, var(--warn) 55%, var(--danger) 90%);
    border-radius: 3px;
    transition: width 0.5s linear;
}

/* DSC chart */
.dsc-panel {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    min-height: 0;
}

.panel-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.dsc-panel h3,
.dt-panel h3 {
    margin: 0;
    font-size: 0.67rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-weight: 600;
}

.peak-badge {
    font-size: 0.61rem;
    font-weight: 600;
    color: var(--warn);
    background: rgba(249, 168, 37, 0.08);
    border: 1px solid rgba(249, 168, 37, 0.25);
    border-radius: 4px;
    padding: 0.2rem 0.55rem;
    white-space: nowrap;
    opacity: 0;
    transition: opacity 0.6s;
}

.peak-badge.visible { opacity: 1; }

.canvas-wrap {
    position: relative;
    width: 100%;
    flex: 1;
    min-height: 200px;
}

/* ΔT chart */
.dt-panel {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.dt-canvas { min-height: 130px; }

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

/* ══════════════════════════════════════════
   RIGHT COLUMN: CONTROLS + TELEMETRY + LOG
══════════════════════════════════════════ */
.control-column {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.section-lbl {
    margin: 0 0 0.75rem;
    font-size: 0.59rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--text-muted);
    font-weight: 600;
}

.ctrl-panel {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.param-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.param-row label {
    font-size: 0.68rem;
    color: var(--text-muted);
    min-width: 36px;
}

.param-row input {
    flex: 1;
    min-width: 0;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    color: var(--text-main);
    border-radius: 4px;
    font-family: var(--mono);
    font-size: 0.82rem;
    padding: 0.38rem 0.5rem;
    transition: border-color 0.2s;
}

.param-row input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 6px var(--accent-glow);
}

.param-row span {
    font-size: 0.66rem;
    color: var(--text-muted);
    white-space: nowrap;
}

/* scan toggle */
.scan-toggle {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.65rem;
    padding: 0.75rem;
    background: rgba(63, 185, 80, 0.08);
    border: 1px solid rgba(63, 185, 80, 0.3);
    border-radius: 4px;
    font-family: var(--mono);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--good);
    cursor: pointer;
    transition: all 0.2s;
}

.scan-toggle:hover { background: rgba(63, 185, 80, 0.15); }

.scan-toggle.inactive {
    background: var(--bg-dark);
    border-color: var(--border);
    color: var(--text-muted);
}

.pulse-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--good);
    flex-shrink: 0;
    animation: pulse-glow 2s ease-in-out infinite;
}

.scan-toggle.inactive .pulse-dot {
    background: var(--text-muted);
    animation: none;
}

@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 0 0 rgba(63, 185, 80, 0.55); }
    50%       { box-shadow: 0 0 0 5px rgba(63, 185, 80, 0); }
}

.reset-toggle {
    width: 100%;
    padding: 0.6rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-family: var(--mono);
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s;
}

.reset-toggle:hover {
    border-color: var(--warn);
    color: var(--warn);
}

/* telemetry rows */
.metrics-panel { padding: 1rem; }

.tele-row {
    display: flex;
    align-items: baseline;
    gap: 0.45rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(48, 54, 61, 0.75);
}

.tele-last { border-bottom: none; }

.tele-lbl {
    color: var(--text-muted);
    font-size: 0.66rem;
    flex: 1;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.tele-val {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent);
    text-shadow: 0 0 8px rgba(88, 166, 255, 0.4);
}

.tele-val.tele-purple {
    color: var(--purple);
    text-shadow: 0 0 8px rgba(163, 113, 247, 0.4);
}

.tele-val.tele-warn {
    color: var(--warn);
    text-shadow: 0 0 8px rgba(249, 168, 37, 0.4);
}

.tele-val.hf-peak {
    color: var(--danger);
    text-shadow: 0 0 10px rgba(248, 81, 73, 0.5);
}

.tele-unit {
    color: var(--text-muted);
    font-size: 0.66rem;
}

/* event log */
.log-panel {
    padding: 1rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.status-log {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column-reverse;
    margin-top: 0.5rem;
    border-top: 1px solid var(--border);
    padding-top: 0.5rem;
    font-size: 0.66rem;
}

.status-log p {
    margin: 0;
    padding: 0.38rem 0;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    line-height: 1.4;
}

.status-log p:last-child { border-top: none; }
.status-log p.warn  { color: var(--warn); }
.status-log p.good  { color: var(--good); }
.status-log p.stop  { color: var(--danger); font-weight: 600; }
.status-log p.info  { color: var(--purple); }

/* ── RESPONSIVE ── */
@media (max-width: 1200px) {
    .app-shell { grid-template-columns: 170px 1fr 235px; }
}

@media (max-width: 960px) {
    .app-shell {
        grid-template-columns: 1fr 1fr;
        grid-template-rows: auto auto;
    }
    .probe-column   { grid-column: 1; grid-row: 1; }
    .control-column { grid-column: 2; grid-row: 1; }
    .chart-column   { grid-column: 1 / 3; grid-row: 2; }
    .chart-column   { min-height: 0; }
}

@media (max-width: 640px) {
    body { padding: 0.75rem; }
    .app-shell { grid-template-columns: 1fr; }
    .probe-column, .control-column, .chart-column { grid-column: auto; grid-row: auto; }
    .title-bar { flex-direction: column; align-items: flex-start; }
    .vessel { min-height: 150px; }
}