:root {
  --navy: #0d2b45;
  --navy-2: #163d5e;
  --sea: #e8f1f8;
  --accent: #1673c4;
  --accent-soft: #dceaf7;
  --text: #1b2733;
  --muted: #5d6b78;
  --line: #d3dde6;
  --bg: #f4f7fa;
  --panel: #ffffff;
  --green: #12a33a;
  --pos-blue: #2f86d6;
  --toolbar-w: 76px;
  --panel-w: 290px;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  overflow: hidden;
}
button, input, select, textarea { font: inherit; color: inherit; }
[hidden] { display: none !important; }

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

/* Barra superior */
.topbar {
  display: flex; align-items: center; gap: 12px;
  padding: 6px 12px; background: var(--navy); color: #fff; min-height: 52px;
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 600; white-space: nowrap; }
.brand-logo {
  width: 40px; height: 40px; border-radius: 9px; background: #fff;
  display: grid; place-items: center; flex: none;
}
.brand-logo img { height: 34px; width: auto; display: block; }
.exam-select { display: flex; align-items: center; gap: 6px; font-size: 14px; }
.exam-select span { opacity: .8; }
.exam-select select {
  background: var(--navy-2); color: #fff; border: 1px solid #2f5a80; border-radius: 6px;
  padding: 5px 8px; max-width: 260px;
}
.spacer { flex: 1; }
.actions { display: flex; gap: 4px; align-items: center; }
.icon-btn {
  width: 38px; height: 38px; display: grid; place-items: center;
  background: transparent; border: 0; border-radius: 8px; color: #fff; cursor: pointer;
}
.icon-btn:hover { background: rgba(255,255,255,.12); }
.icon-btn:disabled { opacity: .35; cursor: default; background: none; }
.icon-btn svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.panel-toggle { display: none; }

.menu { position: relative; }
.menu-list {
  position: absolute; right: 0; top: 44px; z-index: 20; min-width: 230px;
  background: #fff; color: var(--text); border-radius: 8px; padding: 6px;
  box-shadow: 0 8px 24px rgba(0,0,0,.2);
}
.menu-list button {
  display: block; width: 100%; text-align: left; padding: 9px 10px;
  background: none; border: 0; border-radius: 6px; cursor: pointer;
}
.menu-list button:hover { background: var(--accent-soft); }

/* Zona principal */
.main { flex: 1; display: flex; min-height: 0; }

.toolbar {
  width: var(--toolbar-w); background: #fff; border-right: 1px solid var(--line);
  display: flex; flex-direction: column; gap: 2px; padding: 6px; overflow-y: auto;
}
.toolbar button {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  padding: 7px 2px; border: 0; border-radius: 8px; background: none; cursor: pointer;
  font-size: 11px; color: var(--muted);
}
.toolbar button:hover { background: var(--sea); color: var(--text); }
.toolbar button.active { background: var(--accent); color: #fff; }
.toolbar svg { width: 26px; height: 26px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.toolbar svg .fill { fill: currentColor; }
.toolbar svg.green { stroke: #000; stroke-width: 4.6; stroke-linecap: butt; }
.toolbar svg.green path + path { stroke: var(--pos-blue); stroke-width: 2.2; }
.toolbar svg .pink { stroke: #ec4fa0; stroke-width: 2.4; }

.viewport { position: relative; flex: 1; min-width: 0; background: #c9d6e0; overflow: hidden; touch-action: none; }
#chart { display: block; width: 100%; height: 100%; }
.viewport.tool-pan #chart { cursor: grab; }
.viewport.panning #chart { cursor: grabbing; }
.viewport.tool-pan.over-link #chart { cursor: pointer; }
.viewport.tool-text #chart { cursor: text; }
.viewport.tool-eraser #chart { cursor: cell; }
.viewport #chart { cursor: crosshair; }

.text-editor {
  position: absolute; z-index: 5; min-width: 140px; padding: 2px 6px;
  border: 2px solid var(--accent); border-radius: 4px; background: rgba(255,255,255,.95);
  outline: none; transform: translateY(-50%);
}

.zoom-ctrls {
  position: absolute; right: 12px; bottom: 12px; display: flex; flex-direction: column;
  background: #fff; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,.2); overflow: hidden;
}
.zoom-ctrls button {
  width: 40px; height: 40px; border: 0; background: #fff; cursor: pointer; font-size: 22px; line-height: 1;
  display: grid; place-items: center;
}
.zoom-ctrls button + button { border-top: 1px solid var(--line); }
.zoom-ctrls button:hover { background: var(--sea); }
.zoom-ctrls svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; }

.loading {
  position: absolute; inset: 0; display: grid; place-items: center;
  font-size: 18px; color: var(--navy); background: #dde6ee;
}

/* Ventana flotante (calculadora) */
.float-win {
  position: absolute; z-index: 8; top: 16px; left: 16px; width: 340px; height: 520px;
  max-width: calc(100% - 32px); max-height: calc(100% - 32px);
  background: #fff; border-radius: 10px; box-shadow: 0 10px 30px rgba(0,0,0,.3);
  display: flex; flex-direction: column; overflow: hidden; resize: both;
}
.float-head {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  padding: 6px 6px 6px 12px; background: var(--navy); color: #fff; font-weight: 600; font-size: 14px;
  cursor: move; user-select: none; touch-action: none;
}
.float-head button {
  width: 30px; height: 30px; border: 0; border-radius: 6px; background: none; color: #fff;
  font-size: 22px; line-height: 1; cursor: pointer;
}
.float-head button:hover { background: rgba(255,255,255,.15); }
.float-win iframe { flex: 1; width: 100%; border: 0; }
.float-win.dragging iframe { pointer-events: none; }
.toolbar button.toggle.active { background: var(--accent-soft); color: var(--accent); box-shadow: inset 0 0 0 2px var(--accent); }

/* Panel lateral */
.panel {
  width: var(--panel-w); background: var(--panel); border-left: 1px solid var(--line);
  display: flex; flex-direction: column; min-height: 0;
}
.tabs { display: flex; border-bottom: 1px solid var(--line); }
.tab {
  flex: 1; padding: 11px 6px; border: 0; background: none; cursor: pointer;
  color: var(--muted); border-bottom: 2px solid transparent; font-weight: 500;
}
.tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.tab-body { padding: 14px; overflow-y: auto; flex: 1; }
.tab-body h2 { font-size: 17px; margin: 0 0 4px; color: var(--navy); }
.tab-body h3 { font-size: 12px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); margin: 14px 0 6px; display: flex; justify-content: space-between; }
.hint { color: var(--muted); font-size: 14px; margin: 0 0 6px; line-height: 1.4; }
.hint.small { font-size: 12.5px; }
.group { border-top: 1px solid var(--line); margin-top: 12px; }
.group:first-of-type { margin-top: 8px; }

.swatches { display: flex; flex-wrap: wrap; gap: 8px; }
.swatch {
  width: 30px; height: 30px; border-radius: 50%; border: 3px solid #fff; cursor: pointer;
  box-shadow: 0 0 0 1px var(--line);
}
.swatch.active { box-shadow: 0 0 0 2px var(--accent); }

input[type=range] { width: 100%; accent-color: var(--accent); }
.check { display: flex; align-items: center; gap: 8px; font-size: 14px; margin: 8px 0; cursor: pointer; }
.check input { accent-color: var(--accent); width: 16px; height: 16px; }

.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chips button, .btn-row button, .coord-row button, button.primary {
  padding: 7px 11px; border-radius: 6px; border: 1px solid var(--line); background: #fff; cursor: pointer; font-size: 14px;
}
.chips button:hover, .btn-row button:hover, .coord-row button:hover { background: var(--sea); }
.chips button.active { background: var(--accent-soft); border-color: var(--accent); }
button.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
button.primary:hover { background: #0f5fa6; }
code { background: var(--sea); padding: 0 4px; border-radius: 3px; }

.coord-row { display: flex; align-items: center; gap: 4px; margin-bottom: 8px; font-size: 14px; }
.coord-row > span { width: 50px; font-weight: 600; color: var(--navy); }
.coord-row input[type=number] { width: 62px; padding: 5px; border: 1px solid var(--line); border-radius: 5px; }
.coord-row select { padding: 5px; border: 1px solid var(--line); border-radius: 5px; background: #fff; }
input[type=time] { padding: 5px; border: 1px solid var(--line); border-radius: 5px; }
.group button.primary { width: 100%; margin-top: 4px; }
.btn-row { display: flex; gap: 6px; }
.btn-row button { flex: 1; }
.btn-row button.primary { margin-top: 0; }

.result dl { display: grid; grid-template-columns: auto 1fr; gap: 4px 10px; margin: 0; font-size: 14px; }
.result dt { color: var(--muted); }
.result dd { margin: 0; font-weight: 600; font-variant-numeric: tabular-nums; }
.result dd.big { font-size: 22px; color: var(--accent); }
.big-angle { font-size: 34px; font-weight: 700; color: var(--accent); font-variant-numeric: tabular-nums; }

.exam-text { font-size: 14.5px; line-height: 1.5; }
.exam-text ol { padding-left: 20px; }
textarea {
  width: 100%; border: 1px solid var(--line); border-radius: 6px; padding: 8px; resize: vertical; font-size: 14px;
}

/* Barra de estado */
.statusbar {
  display: flex; gap: 16px; align-items: center; padding: 4px 12px; font-size: 13px;
  background: #fff; border-top: 1px solid var(--line); color: var(--muted);
  font-variant-numeric: tabular-nums; min-height: 28px;
}
#coords { color: var(--navy); font-weight: 600; white-space: nowrap; }
.status-hint { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

dialog { border: 0; border-radius: 12px; max-width: 560px; padding: 20px 24px; box-shadow: 0 20px 50px rgba(0,0,0,.3); }
dialog::backdrop { background: rgba(13,43,69,.45); }
dialog h2 { margin-top: 0; color: var(--navy); }
dialog li { margin-bottom: 6px; line-height: 1.4; }
dialog form { text-align: right; }

/* Móvil / tablet vertical */
@media (max-width: 820px) {
  .topbar { gap: 6px; padding: 6px 8px; }
  .brand span { display: none; }
  .exam-select span { display: none; }
  .exam-select select { max-width: 150px; }
  .actions { gap: 0; }
  .icon-btn { width: 34px; }
  .panel-toggle { display: grid; }
  .main { flex-direction: column-reverse; position: relative; }
  .toolbar {
    width: 100%; flex-direction: row; overflow-x: auto; border-right: 0; border-top: 1px solid var(--line);
    padding: 4px;
  }
  .toolbar button { min-width: 62px; }
  .panel {
    position: absolute; right: 0; top: 0; bottom: 70px; width: min(320px, 92vw); z-index: 10;
    box-shadow: -6px 0 20px rgba(0,0,0,.2); transform: translateX(105%); transition: transform .2s;
  }
  .app.panel-open .panel { transform: none; }
  .status-hint { display: none; }
}

@media (max-width: 440px) {
  .brand span:not(.brand-logo) { display: none; }
  .exam-select select { max-width: 112px; }
}