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

:root {
    --bg:      #0c1210;
    --bg2:     #141c18;
    --bg3:     #1a2420;
    --border:  #2c3a32;
    --text:    #e6edf3;
    --muted:   #7d9285;
    --blue:    #e8a828;
    --green:   #5a9970;
    --red:     #f85149;
    --font:    'Segoe UI', system-ui, -apple-system, sans-serif;
}

html, body {
    height: 100%;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    font-size: 16px;
    overflow: hidden;
}

#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* ── Header ──────────────────────────────────────────── */

#header {
    background: var(--bg2);
    border-bottom: 1px solid var(--border);
    padding: 10px 18px 8px;
    flex-shrink: 0;
    user-select: none;
}

#title-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
}

#title-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

#brand-link {
    display: flex;
    align-items: center;
    gap: 7px;
    text-decoration: none;
    opacity: 0.9;
    transition: opacity 0.15s;
}
#brand-link:hover { opacity: 1; }

#logo {
    height: 32px;
    width: auto;
    display: block;
    border-radius: 4px;
}

.nav-sep { color: var(--border); margin: 0 4px; }

.btn-link {
    display: inline-flex;
    align-items: center;
    font-family: var(--font);
    font-size: 0.8rem;
    padding: 5px 14px;
    border-radius: 6px;
    border: 1px solid #2e4e40;
    color: #6fa896;
    background: rgba(90,153,112,.07);
    text-decoration: none;
    white-space: nowrap;
    transition: color 0.12s, border-color 0.12s, background 0.12s;
}
.btn-link:hover { color: #8fc8aa; border-color: #4a7860; background: rgba(90,153,112,.15); }

h1 {
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.3px;
    color: var(--blue);
}

#controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

#controls label {
    font-size: 0.78rem;
    color: var(--muted);
}

select {
    font-family: var(--font);
    font-size: 0.8rem;
    padding: 4px 8px;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: var(--bg3);
    color: var(--text);
    cursor: pointer;
    outline: none;
}
select:focus { border-color: var(--blue); }

button {
    font-family: var(--font);
    font-size: 0.8rem;
    padding: 5px 14px;
    border-radius: 6px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background 0.12s, border-color 0.12s, opacity 0.12s;
    white-space: nowrap;
}
button:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-primary  { background: #a83535; border-color: #c44848; color: #fff; padding: 7px 20px; font-size: 0.88rem; font-weight: 600; }
.btn-primary:not(:disabled):hover  { background: #c44848; }

.btn-secondary { background: rgba(232,168,40,.12); border-color: var(--blue); color: var(--blue); }
.btn-secondary:not(:disabled):hover { background: rgba(232,168,40,.24); }

.btn-ghost { background: rgba(232,168,40,.06); border-color: #3a3018; color: #9a8860; }
.btn-ghost:not(:disabled):hover { background: rgba(232,168,40,.14); border-color: #5a4a28; color: #c4a870; }

/* "How to Use" — amber-filled, stands out from all other controls */
#help-btn { background: var(--blue); border-color: var(--blue); color: #1a1a1a; font-weight: 600; }
#help-btn:hover { background: #f0b830; border-color: #f0b830; }

#status-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.78rem;
    color: var(--muted);
}
#status-bar strong { color: var(--text); font-weight: 600; }
.sep { color: var(--border); }
.angle-readout { letter-spacing: 0.2px; }

.dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    flex-shrink: 0;
    transition: background 0.3s, box-shadow 0.3s;
}
.dot.connected    { background: var(--green); box-shadow: 0 0 6px var(--green); }
.dot.disconnected { background: var(--muted); }
.dot.error        { background: var(--red);   box-shadow: 0 0 6px var(--red); }

/* ── Main layout ─────────────────────────────────────── */

#main {
    display: grid;
    grid-template-columns: 1fr 320px;
    flex: 1;
    min-height: 0;
}

/* ── 3D viewer ───────────────────────────────────────── */

#viewer-panel {
    position: relative;
    background: var(--bg);
    overflow: hidden;
}

#viewer-label {
    position: absolute;
    top: 12px;
    left: 16px;
    font-size: 0.72rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 1.2px;
    pointer-events: none;
    z-index: 2;
}

#viewer-hint {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.72rem;
    color: var(--muted);
    opacity: 0.6;
    pointer-events: none;
    z-index: 2;
}

#three-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* ── Charts panel ────────────────────────────────────── */

#charts-panel {
    background: var(--bg2);
    border-left: 1px solid var(--border);
    overflow-y: auto;
    padding: 10px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

#charts-panel::-webkit-scrollbar { width: 4px; }
#charts-panel::-webkit-scrollbar-track { background: transparent; }
#charts-panel::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.chart-card {
    background: var(--bg3);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px 10px 6px;
}

.chart-title {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 6px;
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.9px;
    color: var(--muted);
}
.chart-unit { font-weight: 400; font-style: italic; }

.chart-wrap {
    position: relative;
    height: 100px;
}
.chart-wrap canvas { width: 100% !important; height: 100% !important; }

.chart-legend {
    display: flex;
    gap: 12px;
    margin-top: 4px;
    font-size: 0.72rem;
    color: var(--muted);
}

.chart-stats {
    font-size: 0.78rem;
    color: var(--muted);
    padding: 4px 4px 0;
    font-family: 'Cascadia Code', 'Consolas', monospace;
    white-space: pre;
    line-height: 1.6;
    flex-shrink: 0;
}
.leg::before {
    content: '—';
    color: var(--c);
    margin-right: 3px;
    font-weight: 700;
}

.hidden { display: none !important; }

/* ── Format info ─────────────────────────────────────── */

#format-box {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px 12px;
    font-size: 0.72rem;
    color: var(--muted);
    line-height: 1.7;
}
.format-title {
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    font-size: 0.7rem;
}
code {
    font-family: 'Cascadia Code', 'Consolas', monospace;
    background: var(--bg2);
    padding: 1px 5px;
    border-radius: 3px;
    color: var(--blue);
    font-size: 0.78rem;
}
.format-note { font-size: 0.69rem; margin-top: 2px; }

/* ── Mag-cal panel ───────────────────────────────────── */

#mag-cal-panel {
    flex-shrink: 0;
    height: 240px;
    background: var(--bg2);
    border-top: 1px solid var(--border);
    padding: 6px 12px 8px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

#mag-cal-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

#mag-cal-title {
    font-size: 0.72rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

#mag-cal-charts {
    flex: 1;
    display: flex;
    gap: 8px;
    min-height: 0;
}

.mag-cal-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
    background: var(--bg3);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 4px;
}

.mag-cal-label {
    font-size: 0.65rem;
    font-weight: 600;
    text-align: center;
    flex-shrink: 0;
}

.mag-cal-item canvas {
    flex: 1;
    min-height: 0;
    width: 100% !important;
}

.mag-bias {
    font-size: 0.65rem;
    color: var(--muted);
    text-align: center;
    flex-shrink: 0;
    font-family: 'Cascadia Code', 'Consolas', monospace;
}

/* ── Help modal ───────────────────────────────────────────────────── */

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.72);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}
.modal-overlay.hidden { display: none; }

.modal-box {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: 10px;
    width: 100%;
    max-width: 1000px;
    height: 82vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 24px 64px rgba(0,0,0,0.6);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.1rem 1.4rem 0.9rem;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}
.modal-header h2 { font-size: 1.1rem; font-weight: 600; color: var(--text); font-family: 'JetBrains Mono', monospace; letter-spacing: -0.01em; }

.modal-close {
    background: transparent;
    border: none;
    color: var(--muted);
    font-size: 1.1rem;
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 4px;
    line-height: 1;
}
.modal-close:hover { color: var(--text); background: var(--bg3); }

.modal-body {
    flex: 1 1 0;          /* shrink to zero so max-height on parent is respected */
    overflow-y: auto;
    min-height: 0;
    padding: 1.2rem 1.4rem 1.6rem;
}

.modal-intro {
    font-size: 1.05rem;
    font-family: 'IBM Plex Sans', system-ui, sans-serif;
    color: #cdd9e5;
    line-height: 1.75;
    padding: 0.2rem 0.1rem;
}
.modal-intro strong { color: var(--text); }
.modal-intro .modal-links { margin-top: 0.8rem; display: flex; gap: 1.4rem; flex-wrap: wrap; }

.modal-intro + .modal-section { margin-top: 1.2rem; }
.modal-section + .modal-section { margin-top: 1rem; }

.modal-section {
    border-radius: 6px;
    overflow: hidden;
}
.modal-section summary {
    list-style: none;
    cursor: pointer;
    padding: 0.85rem 1.1rem;
    font-size: 0.95rem;
    font-weight: 600;
    font-family: 'JetBrains Mono', monospace;
    color: var(--blue);
    letter-spacing: -0.01em;
    user-select: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.modal-section summary::-webkit-details-marker { display: none; }
.modal-section summary::after {
    content: '▸';
    margin-left: auto;
    font-size: 0.75rem;
    color: var(--muted);
    transition: transform 0.18s;
}
.modal-section[open] summary::after { transform: rotate(90deg); }
.modal-section summary:hover { background: rgba(88,166,255,0.06); }

.modal-section-body,
.modal-section > ol,
.modal-section > ul,
.modal-section > p,
.modal-section > table {
    padding: 0 1.1rem 1rem;
}
.modal-section p, .modal-section li {
    font-size: 1rem;
    font-family: 'IBM Plex Sans', system-ui, sans-serif;
    color: #cdd9e5;
    line-height: 1.75;
}
.modal-section > p { padding-top: 0.1rem; }
.modal-section strong { color: var(--text); }
.modal-section em     { color: var(--blue); font-style: normal; }
.modal-section ol, .modal-section ul {
    list-style-type: circle;
    padding-left: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}
.modal-section > p + ol,
.modal-section > p + ul { margin-top: 0.5rem; }

.modal-code {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.75rem 0.9rem;
    font-family: 'Cascadia Code', 'Consolas', monospace;
    font-size: 0.85rem;
    color: var(--text);
    white-space: pre;
    overflow-x: auto;
    margin: 0.8rem 1.1rem 0.5rem;
}

.modal-section code {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 3px;
    padding: 0.1em 0.35em;
    font-family: 'Cascadia Code', 'Consolas', monospace;
    font-size: 0.78em;
    color: var(--text);
}

.modal-link { color: var(--blue); text-decoration: none; font-size: 1rem; font-weight: 500; font-family: 'IBM Plex Sans', system-ui, sans-serif; }
.modal-link:hover { text-decoration: underline; }