:root {
  color-scheme: light;
  --paper: #f2f4f1;
  --surface: #ffffff;
  --surface-2: #eef1ed;
  --ink: #17201c;
  --ink-2: #55615b;
  --ink-3: #7a857f;
  --rule: #d8ded9;
  --rule-strong: #bac5bd;
  --accent: #0c6b5d;
  --accent-hover: #09574c;
  --blue-line: #222d5c;
  --red-line: #822f0d;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(21, 32, 27, 0.05), 0 8px 24px -18px rgba(21, 32, 27, 0.28);
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* { box-sizing: border-box; }

html, body { min-height: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
}

button, input { font: inherit; }
button { color: inherit; }

.site-header {
  min-height: 58px;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid var(--rule);
  background: rgba(242, 244, 241, 0.96);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-size: 15px;
  font-weight: 720;
  letter-spacing: -0.01em;
}

.brand-mark {
  width: 20px;
  height: 14px;
  border: 2px solid var(--accent);
  border-left-width: 5px;
  transform: skewX(-14deg);
}

.header-note {
  margin: 0;
  color: var(--ink-2);
  font-size: 13px;
}

.app-shell {
  min-height: calc(100vh - 58px);
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
}

.control-panel {
  padding: 32px 28px 48px;
  background: var(--surface);
  border-right: 1px solid var(--rule);
  overflow-y: auto;
}

.intro { padding-bottom: 32px; }
.intro h1 {
  margin: 0;
  max-width: 8ch;
  font-size: clamp(34px, 4vw, 44px);
  line-height: 0.98;
  letter-spacing: -0.045em;
  font-weight: 700;
}
.intro p {
  margin: 18px 0 0;
  color: var(--ink-2);
  font-size: 14px;
  line-height: 1.58;
}

.panel-section {
  padding: 24px 0;
  border-top: 1px solid var(--rule);
}

.panel-section h2,
.section-heading h2 {
  margin: 0;
  font-size: 14px;
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.section-meta {
  color: var(--ink-3);
  font-size: 11px;
  text-align: right;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.button-row.centered { justify-content: center; }

.button,
.text-button,
.segment {
  border: 0;
  background: none;
  cursor: pointer;
  transition: background-color 150ms ease, border-color 150ms ease, color 150ms ease, opacity 150ms ease;
}

.button {
  min-height: 38px;
  padding: 0 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--rule-strong);
  border-radius: 7px;
  background: var(--surface);
  color: var(--ink);
  font-size: 13px;
  font-weight: 650;
  text-decoration: none;
}
.button:hover { background: var(--surface-2); border-color: #aab7ae; }
.button-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.button-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.button-wide { width: 100%; margin-top: 14px; }
.button:disabled, .text-button:disabled { cursor: not-allowed; opacity: 0.42; }

.offside-button { margin-top: 12px; }
.offside-status {
  min-height: 17px;
  margin: 8px 0 0;
  color: var(--ink-3);
  font-size: 11px;
  line-height: 1.45;
}
.offside-status.is-ready { color: var(--ink-2); }
.offside-status.is-clear { color: var(--accent); font-weight: 680; }
.offside-status.is-offside { color: var(--red-line); font-weight: 680; }

.text-button {
  padding: 0;
  color: var(--accent);
  font-size: 12px;
  font-weight: 680;
}
.text-button:hover { color: var(--accent-hover); }

.range-label {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 10px;
  color: var(--ink-2);
  font-size: 12px;
}
.range-label output { color: var(--ink); font-variant-numeric: tabular-nums; }
.range { width: 100%; accent-color: var(--accent); }

.status {
  min-height: 38px;
  margin: 14px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--rule-strong);
  color: var(--ink-2);
  font-size: 12px;
  line-height: 1.5;
}
.status.is-working { border-left-color: var(--accent); color: var(--ink); }
.status.is-success { border-left-color: var(--accent); color: var(--ink); }

.field-group + .check-row { margin-top: 16px; }

.field-group + .field-group { margin-top: 20px; }
.field-label-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}
.field-label-row .field-label { margin-bottom: 8px; }
.line-count {
  color: var(--ink-3);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
}
.line-count b { color: var(--ink); font-weight: 700; }
.calibration-guides {
  padding-top: 18px;
  border-top: 1px solid var(--rule);
}
.calibration-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.calibration-button {
  min-width: 0;
  padding-inline: 9px;
  font-size: 12px;
}
.calibration-button.is-active {
  border-color: var(--accent);
  background: var(--surface-2);
  color: var(--accent);
}
.calibration-actions {
  margin-top: 10px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.calibration-point-actions { margin-top: 7px; }
.muted-action { color: var(--ink-3); }
.muted-action:hover { color: var(--ink); }
.field-help {
  margin: 10px 0 0;
  color: var(--ink-3);
  font-size: 11px;
  line-height: 1.45;
}
.field-label {
  display: block;
  margin-bottom: 8px;
  color: var(--ink-2);
  font-size: 12px;
}

.segmented {
  display: inline-grid;
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
  padding: 3px;
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: var(--surface-2);
}
.segmented-colors { width: 100%; }
.segment {
  min-height: 31px;
  padding: 0 10px;
  border-radius: 5px;
  color: var(--ink-2);
  font-size: 12px;
  font-weight: 650;
  white-space: nowrap;
}
.segment:hover { color: var(--ink); }
.segment.is-active { background: var(--surface); color: var(--ink); box-shadow: 0 1px 2px rgba(21, 32, 27, 0.08); }
.line-swatch {
  display: inline-block;
  width: 13px;
  height: 2px;
  margin-right: 7px;
  vertical-align: middle;
}
.line-swatch.blue { background: var(--blue-line); }
.line-swatch.red { background: var(--red-line); }

.check-row {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  color: var(--ink-2);
  font-size: 12px;
  line-height: 1.4;
  cursor: pointer;
}
.check-row + .check-row { margin-top: 10px; }
.check-row input { margin: 1px 0 0; accent-color: var(--accent); }
.check-row.compact { align-items: center; white-space: nowrap; }

.measure-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 94px;
  gap: 12px 14px;
  align-items: end;
}
.number-field span,
.result-cell span,
.distance-total span {
  display: block;
  margin-bottom: 7px;
  color: var(--ink-3);
  font-size: 11px;
}
.number-field input {
  width: 100%;
  height: 38px;
  padding: 0 10px;
  border: 1px solid var(--rule-strong);
  border-radius: 6px;
  outline: none;
  background: var(--surface);
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.number-field input:focus { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(12, 107, 93, 0.12); }
.result-cell strong,
.distance-total strong {
  display: block;
  color: var(--ink);
  font-size: 16px;
  font-weight: 690;
  font-variant-numeric: tabular-nums;
  overflow: hidden;
  text-overflow: ellipsis;
}
.distance-total {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
}
.distance-total span { margin: 0; }
.distance-total strong { font-size: 20px; }

.instructions p {
  margin: 10px 0 0;
  color: var(--ink-2);
  font-size: 12px;
  line-height: 1.58;
}
kbd {
  padding: 1px 5px;
  border: 1px solid var(--rule-strong);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: var(--surface-2);
  color: var(--ink);
  font: inherit;
  font-size: 11px;
}

.workspace {
  min-width: 0;
  min-height: calc(100vh - 58px);
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
}

.workspace-toolbar,
.workspace-footer {
  min-height: 64px;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}
.workspace-toolbar { border-bottom: 1px solid var(--rule); }
.workspace-footer {
  min-height: 42px;
  border-top: 1px solid var(--rule);
  color: var(--ink-3);
  font-size: 11px;
}

.mode-control,
.toolbar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.mode-control > span { color: var(--ink-3); font-size: 11px; }

.viewport {
  position: relative;
  min-height: 500px;
  padding: 28px;
  display: grid;
  place-items: center;
  overflow: auto;
  outline: none;
}
.viewport.is-dragover { background: #e9eeea; }
.viewport.has-image { place-items: start center; }

.empty-state {
  max-width: 470px;
  padding: 40px 24px;
  text-align: center;
}
.empty-rule {
  width: 72px;
  height: 52px;
  margin: 0 auto 26px;
  border: 2px solid var(--accent);
  border-right-width: 8px;
  transform: skewX(-14deg);
}
.empty-state h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1;
  letter-spacing: -0.04em;
}
.empty-state p {
  max-width: 52ch;
  margin: 16px auto 22px;
  color: var(--ink-2);
  font-size: 14px;
  line-height: 1.55;
}

.stage {
  position: relative;
  flex: 0 0 auto;
  border: 1px solid #202822;
  background: #202822;
  box-shadow: var(--shadow);
  transform-origin: center;
  user-select: none;
}
.stage > #sourceImage {
  width: 100%;
  height: 100%;
  display: block;
  pointer-events: none;
}
.stage canvas {
  position: absolute;
  z-index: 2;
  inset: 0;
  width: 100%;
  height: 100%;
  cursor: crosshair;
  touch-action: none;
}
.offside-banner {
  position: absolute;
  z-index: 3;
  left: 50%;
  bottom: 5.7%;
  width: min(284px, 19%);
  height: auto;
  display: block;
  transform: translateX(-50%);
  pointer-events: none;
  user-select: none;
}
.offside-banner[hidden] { display: none; }

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

@media (max-width: 1050px) {
  .app-shell { grid-template-columns: 300px minmax(0, 1fr); }
  .control-panel { padding-inline: 22px; }
  .toolbar-actions .check-row { display: none; }
}

@media (max-width: 780px) {
  .site-header { padding-inline: 16px; }
  .header-note { display: none; }
  .app-shell { display: block; }
  .control-panel { border-right: 0; border-bottom: 1px solid var(--rule); }
  .intro h1 { max-width: none; }
  .workspace { min-height: 80vh; }
  .workspace-toolbar { align-items: flex-start; flex-direction: column; }
  .viewport { min-height: 420px; padding: 14px; }
}

.zoom-control {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 3px;
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: var(--surface-2);
}
.zoom-button,
.zoom-value {
  min-width: 31px;
  height: 31px;
  padding: 0 8px;
  border: 0;
  border-radius: 5px;
  background: transparent;
  color: var(--ink-2);
  cursor: pointer;
  font-size: 14px;
  font-weight: 680;
  line-height: 1;
  transition: background-color 150ms ease, color 150ms ease;
}
.zoom-button:hover,
.zoom-value:hover { background: var(--surface); color: var(--ink); }
.zoom-value {
  min-width: 54px;
  font-size: 11px;
  font-variant-numeric: tabular-nums;
}
.zoom-fit {
  min-height: 31px;
  padding: 0 8px;
  border-left: 1px solid var(--rule);
  margin-left: 3px;
}

.viewport.has-image {
  display: block;
  place-items: initial;
}
.viewport.has-image .stage { margin: 0 auto; }
.viewport.is-placing-calibration .stage canvas { cursor: copy; }
.viewport.is-pan-ready .stage canvas { cursor: grab; }
.viewport.is-panning,
.viewport.is-panning .stage canvas { cursor: grabbing; }
.viewport.is-panning { user-select: none; }

@media (max-width: 1220px) {
  .workspace-toolbar { align-items: flex-start; }
  .toolbar-actions { flex-wrap: wrap; justify-content: flex-end; }
}

@media (max-width: 780px) {
  .toolbar-actions { width: 100%; justify-content: space-between; }
  .zoom-control { order: -1; }
  .zoom-fit { display: none; }
}
.zoom-button:disabled { cursor: not-allowed; opacity: 0.38; }

/* Independent calibration-line editing */
.calibration-actions { flex-wrap: wrap; row-gap: 8px; }
.viewport.is-editing-calibration .stage canvas { cursor: move; }

@media (max-width: 780px) {
  .offside-banner { width: min(244px, 46%); bottom: 5%; }
}

/* v13 — compact sidebar matching the approved layout. Workspace and app logic stay unchanged. */
.site-header { display: none; }
.app-shell {
  min-height: 100vh;
  grid-template-columns: 268px minmax(0, 1fr);
}
.workspace { min-height: 100vh; }
.control-panel {
  padding: 0 22px 30px;
  overflow-x: hidden;
}
.panel-brand {
  margin: 0 -22px;
  padding: 16px 20px 14px;
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
  color: var(--ink);
  font-size: 11px;
  font-weight: 750;
  letter-spacing: -0.01em;
}
.intro {
  padding: 28px 0 26px;
}
.intro h1 {
  max-width: 7ch;
  font-size: 34px;
  line-height: 0.95;
  letter-spacing: -0.05em;
  font-weight: 720;
}
.control-panel .panel-section {
  padding: 20px 0;
}
.control-panel .section-heading {
  margin-bottom: 13px;
}
.control-panel .panel-section h2,
.control-panel .section-heading h2 {
  font-size: 11px;
  font-weight: 760;
}
.control-panel .button {
  min-height: 31px;
  padding-inline: 12px;
  font-size: 10px;
  border-radius: 6px;
}
.control-panel .text-button {
  font-size: 10px;
}
.control-panel .range-label {
  margin-bottom: 8px;
  font-size: 9px;
}
.control-panel .range {
  height: 14px;
}
.control-panel .status {
  min-height: 52px;
  margin-top: 13px;
  padding-left: 10px;
  font-size: 9px;
  line-height: 1.45;
}
.plane-section .section-heading {
  margin-bottom: 11px;
}
.control-panel .segmented {
  padding: 3px;
  border-radius: 7px;
}
.control-panel .segment {
  min-height: 27px;
  padding-inline: 8px;
  font-size: 9px;
}
.control-panel .line-swatch {
  width: 10px;
  margin-right: 5px;
}
.control-panel .button-wide {
  margin-top: 9px;
}
.control-panel .offside-status {
  margin-top: 7px;
  font-size: 9px;
}
.control-panel .field-group + .field-group {
  margin-top: 18px;
}
.control-panel .calibration-guides {
  padding-top: 16px;
}
.control-panel .field-label,
.control-panel .line-count {
  font-size: 9px;
}
.control-panel .field-label-row .field-label {
  margin-bottom: 7px;
}
.control-panel .calibration-buttons {
  gap: 6px;
}
.control-panel .calibration-button {
  padding-inline: 5px;
  font-size: 9px;
}
.control-panel .calibration-actions {
  margin-top: 8px;
  gap: 10px;
  row-gap: 6px;
}
.control-panel .action-clear {
  flex-basis: 100%;
  text-align: left;
}
.control-panel .field-group + .check-row {
  margin-top: 15px;
}
.control-panel .check-row {
  gap: 7px;
  font-size: 9px;
  line-height: 1.35;
}
.control-panel .check-row + .check-row {
  margin-top: 8px;
}
.control-panel .check-row input {
  width: 11px;
  height: 11px;
}

@media (max-width: 1050px) {
  .app-shell { grid-template-columns: 268px minmax(0, 1fr); }
  .control-panel { padding-inline: 22px; }
}

@media (max-width: 780px) {
  .app-shell { display: block; }
  .control-panel { padding-inline: 22px; }
  .panel-brand { margin-inline: -22px; }
  .intro h1 { max-width: 7ch; }
  .workspace { min-height: 80vh; }
}


.attack-direction {
  margin-top: 18px;
}

.attack-direction-control {
  width: 100%;
}

.attack-direction .field-help {
  margin-top: 8px;
}

.system-warning {
  margin-top: 22px;
  padding: 14px 15px;
  background: #c62828;
  color: #ffffff;
  border-left: 4px solid #8f1515;
  font-size: 12px;
  line-height: 1.5;
}

.system-warning strong {
  display: block;
  margin-bottom: 5px;
  font-size: 13px;
  font-weight: 750;
}

.system-warning p {
  margin: 0;
  color: inherit;
}