/* ===== CAD online — тёмная тема ===== */
:root {
  --bg: #15171c;
  --bg-panel: #1b1e25;
  --bg-elev: #22262f;
  --bg-hover: #2b313d;
  --border: #2c3240;
  --border-soft: #262b36;
  --text: #dfe4ec;
  --text-dim: #8892a4;
  --accent: #3f8cff;
  --accent-soft: #1d3350;
  --danger: #e05a5a;
  --ok: #4caf7d;
  --radius: 7px;
  --panel-w-left: 210px;
  --panel-w-right: 268px;
}

* { box-sizing: border-box; }

/* Атрибут hidden должен работать всегда, даже если у класса задан display. */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font: 13px/1.45 "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
  user-select: none;
}

kbd {
  font: 11px/1 ui-monospace, Consolas, monospace;
  color: var(--text-dim);
  background: #10121a;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 5px;
}

.dim { color: var(--text-dim); }
.spacer { flex: 1; }

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

/* ===== Верхняя панель ===== */
.navbar {
  display: flex;
  align-items: center;
  gap: 10px;
  height: 46px;
  padding: 0 10px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  flex: none;
}

.brand { display: flex; align-items: baseline; gap: 6px; padding-right: 8px; }
.brand-mark { color: var(--accent); font-size: 17px; }
.brand-name { font-weight: 700; letter-spacing: .5px; }
.brand-tag { font-size: 10px; color: var(--text-dim); text-transform: uppercase; letter-spacing: 1px; }

.toolbar { display: flex; align-items: center; gap: 8px; flex: 1; min-width: 0; overflow: visible; }
.tool-group { display: flex; align-items: center; gap: 3px; }
.divider { width: 1px; height: 22px; background: var(--border); margin: 0 3px; flex: none; }

.tool-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  height: 30px;
  min-width: 32px;
  padding: 0 8px;
  justify-content: center;
  background: var(--bg-elev);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
  transition: background .12s, border-color .12s;
}
.tool-btn:hover { background: var(--bg-hover); }
.tool-btn.active { background: #24405f; border-color: var(--accent); color: #cfe4ff; }
.tool-btn.danger:hover { background: #4a2429; border-color: var(--danger); }
.tool-btn .caret { font-size: 9px; color: var(--text-dim); }
.tool-btn .label { font-size: 11.5px; white-space: nowrap; }
.tool-btn.accent { background: #23405f; border-color: #35618f; color: #cfe4ff; }
/* Подписи прячем заранее, иначе на узких экранах они переносятся и обрезаются. */
@media (max-width: 1620px) { .tool-btn .label { display: none; } }

.empty-state {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  padding: 22px 26px;
  border-radius: 14px;
  background: rgba(22, 25, 32, .86);
  border: 1px solid var(--border);
  box-shadow: 0 16px 40px rgba(0, 0, 0, .45);
  pointer-events: auto;
  max-width: 420px;
}
.empty-state.hidden { display: none; }
.empty-title { font-size: 15px; font-weight: 600; margin-bottom: 8px; }
.empty-text { font-size: 12.5px; color: var(--text-dim); line-height: 1.6; margin-bottom: 14px; }
.empty-text b { color: var(--text); }

.mode-hint {
  position: absolute;
  right: 12px;
  top: 12px;
  max-width: 320px;
  padding: 7px 11px;
  border-radius: 9px;
  background: rgba(15, 17, 22, .78);
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 11.5px;
  line-height: 1.5;
  pointer-events: none;
  backdrop-filter: blur(3px);
}
.mode-hint b { color: var(--text); }
.mode-hint:empty { display: none; }

.perf {
  font: 11px/1 ui-monospace, Consolas, monospace;
  color: var(--text-dim);
  padding: 0 6px;
  min-width: 58px;
  text-align: right;
}

/* ===== Dropdown ===== */
.dropdown { position: relative; }
.dropdown-menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 226px;
  padding: 5px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 9px;
  box-shadow: 0 12px 32px rgba(0, 0, 0, .5);
  display: none;
  flex-direction: column;
  gap: 1px;
  z-index: 50;
}
.dropdown.open .dropdown-menu { display: flex; }
.dropdown-menu button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 7px 9px;
  background: none;
  border: 0;
  border-radius: 6px;
  color: var(--text);
  font: inherit;
  text-align: left;
  cursor: pointer;
}
.dropdown-menu button:hover { background: var(--bg-hover); }
.dropdown-menu .sep { height: 1px; background: var(--border); margin: 4px 2px; }
.dropdown-menu button.checked::after { content: '✓'; color: var(--accent); font-weight: 700; }
.dropdown-menu button > span:first-child { flex: 1; }

/* ===== Основная область ===== */
.body { display: flex; flex: 1; min-height: 0; }

.sidebar {
  flex: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 10px;
  background: var(--bg-panel);
  overflow-y: auto;
  overflow-x: hidden;
}
.sidebar.left { width: var(--panel-w-left); border-right: 1px solid var(--border); }
.sidebar.right { width: var(--panel-w-right); border-left: 1px solid var(--border); }

.panel-title {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1.1px;
  color: var(--text-dim);
  margin: 8px 2px 2px;
}
.panel-title:first-child { margin-top: 0; }

/* Список кнопок-действий (панель свойств): строка на кнопку. */
.shape-list { display: flex; flex-direction: column; gap: 4px; }

.shape-btn {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 6px 8px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font: inherit;
  cursor: pointer;
  text-align: left;
}
.shape-btn:hover { background: var(--bg-hover); border-color: #3a4356; }
.shape-btn .glyph { font-size: 15px; width: 20px; text-align: center; color: var(--accent); }

/* Палитра фигур: компактная сетка, 3 кнопки в ряд, только миниатюры.
   Название фигуры показывается подсказкой при наведении. */
.shape-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 5px;
}

.shape-group-title {
  grid-column: 1 / -1;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: .9px;
  color: var(--text-dim);
  margin: 9px 2px 1px;
  opacity: .85;
}
.shape-group-title:first-child { margin-top: 0; }

.shape-grid .shape-btn {
  justify-content: center;
  aspect-ratio: 1 / 1;
  padding: 3px;
  border-radius: 7px;
  transition: background .12s, border-color .12s, transform .06s;
}
.shape-grid .shape-btn:active { transform: scale(.95); }
.shape-grid .shape-btn .glyph { font-size: 19px; width: auto; line-height: 1; }
.shape-grid .shape-thumb {
  width: 100%;
  height: 100%;
  display: block;
  border-radius: 5px;
  background: rgba(255, 255, 255, .04);
}

/* ===== Настройки ===== */
.settings-section {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1.1px;
  color: var(--text-dim);
  margin: 16px 0 6px;
  padding-bottom: 5px;
  border-bottom: 1px solid var(--border-soft);
}
.settings-section:first-child { margin-top: 0; }

.settings-field { margin-bottom: 4px; }
.settings-label { font-size: 12.5px; margin-bottom: 6px; }

.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 7px 2px;
  border-radius: 6px;
  cursor: pointer;
}
.settings-row:hover { background: var(--bg-elev); }
.settings-row-text { font-size: 12.5px; line-height: 1.4; }
.settings-row-text em { display: block; font-style: normal; font-size: 11.5px; color: var(--text-dim); }
.settings-row input[type="checkbox"] { flex: none; width: 16px; height: 16px; accent-color: var(--accent); cursor: pointer; }
.settings-row select {
  background: #10121a;
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--text);
  font: inherit;
  font-size: 12px;
  padding: 5px 7px;
  cursor: pointer;
}

.settings-radios { display: flex; flex-direction: column; gap: 5px; }
.settings-radio {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
}
.settings-radio:hover { background: var(--bg-elev); }
.settings-radio input { margin-top: 2px; accent-color: var(--accent); cursor: pointer; }
.settings-radio b { font-size: 12.5px; display: block; font-weight: 600; }
.settings-radio em { font-style: normal; font-size: 11.5px; color: var(--text-dim); display: block; margin-top: 2px; line-height: 1.45; }
.settings-radio:has(input:checked) { border-color: var(--accent); background: #1b2735; }

.viewport-wrap { position: relative; flex: 1; min-width: 0; }
#viewport { position: absolute; inset: 0; }
#viewport canvas { display: block; outline: none; }

.viewport-hints {
  position: absolute;
  left: 12px;
  bottom: 10px;
  max-width: calc(100% - 24px);
  padding: 5px 10px;
  border-radius: 14px;
  background: rgba(15, 17, 22, .72);
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 11px;
  line-height: 1.5;
  pointer-events: none;
  backdrop-filter: blur(3px);
}
.viewport-hints b { color: var(--text); font-weight: 600; }

.autosave-banner {
  position: absolute;
  top: 12px;
  left: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border-radius: 9px;
  background: #26313f;
  border: 1px solid var(--accent);
  font-size: 12px;
  z-index: 10;
}

/* ===== Формы свойств ===== */
.field-row {
  display: flex;
  align-items: center;
  gap: 8px;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-dim);
  padding: 3px 2px;
}
.field-row input[type="color"] {
  width: 48px; height: 24px; padding: 0;
  background: none; border: 1px solid var(--border); border-radius: 5px; cursor: pointer;
}
.field-row input[type="text"] { flex: 1; }

input[type="text"], input[type="number"] {
  background: #10121a;
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--text);
  font: inherit;
  font-size: 12px;
  padding: 5px 7px;
  min-width: 0;
}
input:focus { outline: 1px solid var(--accent); border-color: var(--accent); }

.vec-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 5px; }
.vec-grid .cell { display: flex; flex-direction: column; gap: 2px; }
.vec-grid .cell label { font-size: 10px; color: var(--text-dim); }
.vec-grid input { width: 100%; }

.params-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.params-grid .cell { display: flex; flex-direction: column; gap: 2px; }
.params-grid .cell label { font-size: 10px; color: var(--text-dim); }

.empty { color: var(--text-dim); font-size: 12px; padding: 10px 2px; line-height: 1.7; }

.scene-info { display: flex; flex-direction: column; gap: 3px; font-size: 12px; color: var(--text-dim); }
.scene-info b { color: var(--text); font-weight: 600; }

/* ===== Статусбар ===== */
.statusbar {
  display: flex;
  align-items: center;
  gap: 14px;
  height: 26px;
  padding: 0 12px;
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
  font-size: 11px;
  color: var(--text);
  flex: none;
  white-space: nowrap;
  overflow: hidden;
}
.status-item { flex: none; }

/* ===== Кнопки ===== */
.btn, .btn-small {
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: var(--radius);
  padding: 8px 16px;
  font: inherit;
  cursor: pointer;
}
.btn-small { padding: 4px 10px; font-size: 12px; border-radius: 6px; }
.btn-small.ghost { background: transparent; border: 1px solid var(--border); color: var(--text-dim); }
.btn:hover, .btn-small:hover { filter: brightness(1.12); }

/* ===== Оверлеи и модалки ===== */
.overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(12, 14, 18, .9);
  z-index: 200;
}
.overlay.hidden { display: none; }
.loading-box { text-align: center; color: var(--text); display: flex; flex-direction: column; gap: 10px; align-items: center; }
.spinner {
  width: 34px; height: 34px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(12, 14, 18, .7);
  z-index: 150;
}
.modal[hidden] { display: none; }
.modal-box {
  width: min(520px, 92vw);
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 22px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, .6);
}
.modal-box h2 { margin: 0 0 10px; font-size: 17px; }
.modal-box p { margin: 6px 0; font-size: 13px; }
.modal-box.wide { width: min(780px, 94vw); max-height: 88vh; overflow-y: auto; }
.modal-box h3 { margin: 4px 0 6px; font-size: 13px; color: var(--text-dim); text-transform: uppercase; letter-spacing: .8px; }
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 16px; }

.steps { margin: 0; padding-left: 20px; display: flex; flex-direction: column; gap: 10px; font-size: 13px; }
.steps > li { line-height: 1.55; }
.steps i { color: #b9c6da; font-style: normal; }

.legend { border-collapse: collapse; margin: 8px 0 4px; font-size: 12px; }
.legend td { padding: 3px 12px 3px 0; vertical-align: top; }
.legend td:first-child { color: var(--text); white-space: nowrap; font-weight: 600; }

.axis-legend { display: flex; flex-wrap: wrap; gap: 14px; font-size: 12px; color: var(--text-dim); margin: 6px 0; }
.axis-legend span { display: inline-flex; align-items: center; gap: 6px; }
.axis-legend i { width: 12px; height: 4px; border-radius: 2px; display: inline-block; }

.note-box {
  margin-top: 12px;
  padding: 11px 13px;
  border-radius: 9px;
  background: #1a2230;
  border: 1px solid #2a3b52;
  border-left: 3px solid var(--accent);
  font-size: 12.5px;
  line-height: 1.6;
}
.note-box b { color: #cfe4ff; }
.note-box kbd { background: #0d1219; }

.help-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 16px; }
.help-cols ul { margin: 0; padding-left: 18px; display: flex; flex-direction: column; gap: 7px; font-size: 12.5px; line-height: 1.5; }
@media (max-width: 620px) { .help-cols { grid-template-columns: 1fr; } }

/* ===== Тосты ===== */
.toasts {
  position: fixed;
  right: calc(var(--panel-w-right) + 16px);
  bottom: 40px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 300;
  pointer-events: none;
}
.toast {
  min-width: 200px;
  max-width: 340px;
  padding: 9px 12px;
  border-radius: 8px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  font-size: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, .45);
  animation: toast-in .16s ease-out;
}
.toast.error { border-left-color: var(--danger); }
.toast.ok { border-left-color: var(--ok); }
@keyframes toast-in { from { opacity: 0; transform: translateY(6px); } }