/*
 * Helios-6 Parametric Solar Tracker & KiCad Telemetry Node
 * Dieter Rams / Teenage Engineering / Mitutoyo metrology blueprint light theme.
 * Zero external CSS dependencies.
 */

:root {
  --bg-vellum: #F5F3EC;
  --bg-panel: #EAE6DA;
  --bg-panel-elevated: #EFECE2;
  --bg-recessed: #DFDBD0;
  --bg-canvas: #EFECE3;
  --ink-primary: #141618;
  --ink-secondary: #3B4045;
  --ink-muted: #656B70;
  --accent-orange: #D95326;
  --accent-orange-hover: #BF4319;
  --accent-orange-soft: rgba(217, 83, 38, 0.13);
  --accent-green: #1B6B53;
  --accent-green-soft: rgba(27, 107, 83, 0.13);
  --accent-amber: #B87D14;
  --accent-blue: #235789;
  --rule-hairline: rgba(20, 22, 24, 0.14);
  --rule-strong: rgba(20, 22, 24, 0.28);
  --shadow-card: 0 1px 2px rgba(20, 22, 24, 0.06), 0 4px 12px rgba(20, 22, 24, 0.04);
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --font-display: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;
}

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

html {
  font-size: 15px;
  scroll-behavior: smooth;
  background-color: var(--bg-vellum);
  color: var(--ink-primary);
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background-color: var(--bg-vellum);
  background-image:
    linear-gradient(to right, rgba(20, 22, 24, 0.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(20, 22, 24, 0.035) 1px, transparent 1px);
  background-size: 24px 24px;
  color: var(--ink-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Tabular numeric discipline across all telemetry */
.mono,
code,
pre,
output,
td,
th,
.metric-value,
.slider-readout,
.badge {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* Skip link for keyboard accessibility */
.skip-link {
  position: absolute;
  top: -48px;
  left: 16px;
  background: var(--ink-primary);
  color: var(--bg-vellum);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  z-index: 1000;
  text-decoration: none;
}

.skip-link:focus {
  top: 12px;
}

/* Top Instrument Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(245, 243, 236, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule-strong);
}

.header-inner {
  max-width: 1560px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-cluster {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  width: 38px;
  height: 38px;
  border: 1.5px solid var(--ink-primary);
  border-radius: var(--radius-sm);
  background: var(--bg-panel);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.brand-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-version {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  background: var(--accent-orange);
  color: #FFFFFF;
}

.brand-subtitle {
  margin: 2px 0 0;
  font-size: 0.82rem;
  color: var(--ink-secondary);
}

.header-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  background: var(--accent-green-soft);
  border: 1px solid var(--accent-green);
  color: var(--accent-green);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-green);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 6px 11px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--ink-primary);
  background: var(--bg-panel);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  transition: background-color 120ms ease, border-color 120ms ease, transform 80ms ease;
}

.btn:hover {
  background: var(--bg-recessed);
  border-color: var(--ink-primary);
}

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

.btn:focus-visible {
  outline: 2px solid var(--accent-orange);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--accent-orange);
  color: #FFFFFF;
  border-color: var(--accent-orange);
}

.btn-primary:hover {
  background: var(--accent-orange-hover);
  border-color: var(--accent-orange-hover);
  color: #FFFFFF;
}

.btn-green {
  background: var(--accent-green);
  color: #FFFFFF;
  border-color: var(--accent-green);
}

.btn-green:hover {
  background: #145440;
  border-color: #145440;
  color: #FFFFFF;
}

.btn.is-active {
  background: var(--ink-primary);
  color: var(--bg-vellum);
  border-color: var(--ink-primary);
}

/* Main Workbench Container */
.workbench-shell {
  max-width: 1560px;
  margin: 0 auto;
  padding: 20px 24px 56px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Intro Banner / Specification Strip */
.spec-banner {
  background: var(--bg-panel);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  display: grid;
  grid-template-columns: 1.5fr repeat(4, 1fr);
  gap: 16px;
  align-items: center;
  box-shadow: var(--shadow-card);
}

.spec-lead h2 {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
}

.spec-lead p {
  margin: 0;
  font-size: 0.84rem;
  color: var(--ink-secondary);
}

.spec-stat {
  border-left: 1px solid var(--rule-hairline);
  padding-left: 14px;
}

.spec-stat-label {
  display: block;
  font-size: 0.76rem;
  color: var(--ink-muted);
  margin-bottom: 2px;
}

.spec-stat-value {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink-primary);
}

/* Three-Column Studio Grid */
.studio-grid {
  display: grid;
  grid-template-columns: 350px minmax(0, 1fr) 390px;
  gap: 18px;
  align-items: start;
}

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.panel-header {
  padding: 11px 15px;
  background: var(--bg-panel-elevated);
  border-bottom: 1px solid var(--rule-hairline);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.panel-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--ink-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.panel-index {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  padding: 1px 6px;
  background: var(--bg-recessed);
  border: 1px solid var(--rule-hairline);
  border-radius: var(--radius-sm);
  color: var(--ink-secondary);
}

.panel-body {
  padding: 14px 15px;
}

/* Preset Bar */
.preset-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}

.preset-btn {
  padding: 4px 8px;
  font-size: 0.73rem;
}

/* Parameter Control Groups */
.control-section {
  border-top: 1px solid var(--rule-hairline);
  padding-top: 12px;
  margin-top: 12px;
}

.control-section:first-of-type {
  border-top: none;
  padding-top: 0;
  margin-top: 0;
}

.section-heading {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--ink-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.slider-group {
  margin-bottom: 11px;
}

.slider-group:last-child {
  margin-bottom: 0;
}

.slider-label-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 4px;
  font-size: 0.82rem;
}

.slider-label-row label {
  font-weight: 500;
  color: var(--ink-primary);
}

.slider-readout {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-orange);
  background: var(--bg-vellum);
  padding: 1px 6px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--rule-hairline);
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--bg-recessed);
  border: 1px solid var(--rule-hairline);
  border-radius: 999px;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-orange);
  border: 2px solid var(--bg-vellum);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  cursor: grab;
}

input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-orange);
  border: 2px solid var(--bg-vellum);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  cursor: grab;
}

input[type="range"]:focus-visible {
  outline: 2px solid var(--accent-orange);
  outline-offset: 2px;
}

/* Exploded Stack Hierarchy Tree */
.stack-chain {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-top: 8px;
}

.stack-node {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 9px;
  background: var(--bg-vellum);
  border: 1px solid var(--rule-hairline);
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  cursor: pointer;
  text-align: left;
  width: 100%;
  color: var(--ink-primary);
  font-family: var(--font-sans);
  transition: border-color 120ms ease, background-color 120ms ease;
}

.stack-node:hover {
  border-color: var(--ink-primary);
}

.stack-node.is-selected {
  border-color: var(--accent-orange);
  background: var(--accent-orange-soft);
  font-weight: 600;
}

.stack-swatch {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  margin-right: 7px;
  border: 1px solid rgba(20, 22, 24, 0.3);
}

/* Center CAD Viewport */
.viewport-toolbar {
  padding: 9px 14px;
  background: var(--bg-vellum);
  border-bottom: 1px solid var(--rule-hairline);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.toolbar-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 5px;
}

.canvas-stage {
  position: relative;
  background: var(--bg-canvas);
  height: 490px;
  width: 100%;
  overflow: hidden;
  user-select: none;
}

#cad-viewport {
  display: block;
  width: 100%;
  height: 100%;
  cursor: grab;
}

#cad-viewport:active {
  cursor: grabbing;
}

.viewport-hud-top {
  position: absolute;
  top: 12px;
  left: 14px;
  right: 14px;
  display: flex;
  justify-content: space-between;
  pointer-events: none;
  gap: 10px;
}

.hud-card {
  background: rgba(245, 243, 236, 0.9);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--ink-primary);
}

.viewport-hud-bottom {
  position: absolute;
  bottom: 10px;
  left: 14px;
  right: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  pointer-events: none;
  font-family: var(--font-mono);
  font-size: 0.73rem;
  color: var(--ink-secondary);
}

/* Metrology Readout Strip Under Viewport */
.metrology-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--rule-hairline);
  background: var(--bg-vellum);
}

.metrology-cell {
  padding: 10px 13px;
  border-right: 1px solid var(--rule-hairline);
  border-bottom: 1px solid var(--rule-hairline);
}

.metrology-cell:nth-child(3n) {
  border-right: none;
}

.metrology-label {
  font-size: 0.74rem;
  color: var(--ink-muted);
  display: block;
}

.metrology-val {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--ink-primary);
}

.metrology-sub {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-secondary);
  display: block;
}

/* Right Column: Sun-Path Polar Stereographic Chart */
.sunpath-wrap {
  background: var(--bg-vellum);
  border: 1px solid var(--rule-hairline);
  border-radius: var(--radius-sm);
  padding: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

#sunpath-svg {
  width: 100%;
  max-width: 320px;
  height: auto;
  display: block;
  cursor: crosshair;
}

.sunpath-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-secondary);
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.legend-line {
  width: 14px;
  height: 2.5px;
  display: inline-block;
}

/* Irradiance Gain Bars */
.energy-bars {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.energy-row {
  font-size: 0.78rem;
}

.energy-row-head {
  display: flex;
  justify-content: space-between;
  margin-bottom: 3px;
}

.energy-track {
  height: 8px;
  background: var(--bg-recessed);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--rule-hairline);
}

.energy-fill {
  height: 100%;
  background: var(--accent-orange);
  border-radius: 999px;
  transition: width 160ms ease;
}

.energy-fill.fixed {
  background: var(--accent-blue);
}

.energy-fill.horiz {
  background: var(--ink-muted);
}

/* Lower Hardware & KiCad Inspector Section */
.hardware-grid {
  display: grid;
  grid-template-columns: 440px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.pcb-stage {
  background: var(--bg-vellum);
  border: 1px solid var(--rule-hairline);
  border-radius: var(--radius-sm);
  padding: 10px;
}

#pcb-svg {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-sm);
}

.pcb-part-card {
  margin-top: 10px;
  padding: 10px 12px;
  background: var(--bg-vellum);
  border: 1px solid var(--rule-hairline);
  border-radius: var(--radius-sm);
  font-size: 0.81rem;
}

.pcb-part-card h4 {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  color: var(--accent-green);
}

/* Tabs & Tables */
.tab-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.inspector-toolbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.search-input {
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: var(--bg-vellum);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius-sm);
  color: var(--ink-primary);
  min-width: 240px;
}

.search-input:focus {
  outline: 2px solid var(--accent-orange);
  outline-offset: 1px;
}

.table-scroll {
  max-height: 440px;
  overflow: auto;
  border: 1px solid var(--rule-hairline);
  border-radius: var(--radius-sm);
  background: var(--bg-vellum);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.79rem;
  text-align: left;
}

.data-table th {
  position: sticky;
  top: 0;
  background: var(--bg-panel-elevated);
  color: var(--ink-primary);
  font-weight: 600;
  padding: 8px 10px;
  border-bottom: 1px solid var(--rule-strong);
  z-index: 2;
}

.data-table td {
  padding: 7px 10px;
  border-bottom: 1px solid var(--rule-hairline);
  vertical-align: top;
}

.data-table tr:hover td {
  background: rgba(217, 83, 38, 0.06);
}

.data-table tr.is-highlighted td {
  background: var(--accent-orange-soft);
}

.data-table a {
  color: var(--accent-orange);
  font-weight: 600;
  text-decoration: none;
}

.data-table a:hover {
  text-decoration: underline;
}

.scad-preview {
  margin: 0;
  padding: 12px;
  background: var(--bg-vellum);
  border: 1px solid var(--rule-hairline);
  border-radius: var(--radius-sm);
  max-height: 420px;
  overflow: auto;
  font-size: 0.78rem;
  line-height: 1.45;
  color: var(--ink-primary);
}

.hidden {
  display: none !important;
}

/* Footer */
.site-footer {
  max-width: 1560px;
  margin: 0 auto;
  padding: 18px 24px 36px;
  border-top: 1px solid var(--rule-strong);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--ink-secondary);
}

@media (max-width: 1240px) {
  .studio-grid {
    grid-template-columns: 1fr;
  }
  .hardware-grid {
    grid-template-columns: 1fr;
  }
  .spec-banner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 680px) {
  .spec-banner {
    grid-template-columns: 1fr;
  }
  .metrology-grid {
    grid-template-columns: 1fr;
  }
}

/* ------------------------------------------------------------------ polish pass */

/* Readouts in panel headers keep their units on one line */
.panel-header > .mono,
.panel-header .btn {
  white-space: nowrap;
  flex-shrink: 0;
}

.panel-title {
  min-width: 0;
}

.spec-stat-value {
  text-wrap: balance;
}

.btn {
  min-height: 34px;
}

.preset-btn {
  min-height: 30px;
  padding: 4px 9px;
}

.preset-btn:hover:not(.is-active) {
  background: var(--bg-recessed);
  border-color: var(--ink-primary);
}

.stack-node:focus-visible,
.search-input:focus-visible,
#cad-viewport:focus-visible {
  outline: 2px solid var(--accent-orange);
  outline-offset: 2px;
}

#cad-viewport {
  touch-action: pan-y pinch-zoom;
}

#cad-viewport:focus-visible {
  outline-offset: -3px;
}

.hint-touch {
  display: none;
}

.hud-card,
.viewport-hud-bottom span {
  text-shadow: 0 0 3px rgba(239, 236, 227, 0.9);
}

.viewport-hud-bottom {
  gap: 12px;
}

.viewport-hud-bottom > span:last-child {
  text-align: right;
}

.search-input {
  flex: 1 1 260px;
  max-width: 420px;
}

.data-table tr.empty-row td {
  padding: 22px 14px;
  text-align: center;
  color: var(--ink-secondary);
  font-family: var(--font-sans);
  background: var(--bg-vellum);
}

.data-table tr.empty-row:hover td {
  background: var(--bg-vellum);
}

.sunpath-legend {
  flex-wrap: wrap;
  row-gap: 4px;
}

@media (pointer: coarse) {
  .btn,
  .preset-btn {
    min-height: 44px;
    padding-left: 13px;
    padding-right: 13px;
  }
  .stack-node {
    min-height: 44px;
  }
  input[type="range"] {
    min-height: 32px;
  }
  .hint-pointer {
    display: none;
  }
  .hint-touch {
    display: inline;
  }
}

/* Header sticks only when there is room to spare */
@media (max-width: 1100px), (max-height: 720px) {
  .site-header {
    position: static;
  }
}

@media (max-width: 1240px) {
  /* The 3D viewport is the headline, so it leads on narrow screens */
  .studio-grid > .panel:nth-child(2) {
    order: -1;
  }
  .canvas-stage {
    height: 430px;
  }
}

@media (max-width: 680px) {
  .header-inner {
    padding: 12px 16px;
  }
  .brand-title {
    flex-wrap: wrap;
    row-gap: 6px;
  }
  .header-actions {
    width: 100%;
  }
  .header-actions .btn {
    flex: 1 1 auto;
    min-height: 40px;
  }
  .workbench-shell {
    padding: 14px 12px 40px;
  }
  .panel-header {
    flex-wrap: wrap;
  }
  .canvas-stage {
    height: 380px;
  }
  .viewport-hud-top {
    top: 8px;
    left: 8px;
    right: 8px;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
  .hud-card {
    font-size: 0.68rem;
    padding: 4px 7px;
  }
  .viewport-hud-bottom {
    left: 8px;
    right: 8px;
    bottom: 6px;
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
    font-size: 0.68rem;
  }
  .viewport-hud-bottom > span:last-child {
    text-align: left;
  }
  .search-input {
    flex-basis: 100%;
    max-width: none;
    min-width: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .btn,
  .stack-node {
    transition: none;
  }
}