:root {
  --bg: #0f1115;
  --bg-panel: #161a21;
  --bg-panel-2: #1c212b;
  --border: #2a303c;
  --text: #d7dce3;
  --text-dim: #8a93a3;
  --accent: #4f8cff;
  --accent-hover: #6ba0ff;
  --danger: #e5534b;
  --danger-hover: #f06a62;
  --green: #3fb950;
  --yellow: #d29922;
  --red: #f85149;
  --mono: "SF Mono", "Cascadia Code", "Fira Code", Consolas, "DejaVu Sans Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  -webkit-tap-highlight-color: transparent;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

/* ---------- Topbar ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 10px 16px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
}

.brand { display: flex; align-items: center; gap: 12px; }

.logo {
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
  background: rgba(79, 140, 255, 0.12);
  border: 1px solid rgba(79, 140, 255, 0.35);
  padding: 6px 10px;
  border-radius: 8px;
}

.brand-text h1 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.2;
}

.brand-text p {
  margin: 0;
  font-size: 12px;
  color: var(--text-dim);
}

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

select {
  appearance: none;
  -webkit-appearance: none;
  background: var(--bg-panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 30px 8px 12px;
  font-size: 13px;
  font-family: var(--sans);
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%238a93a3'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
}

@media (hover: hover) {
  select:hover { border-color: var(--accent); }
}

.btn {
  border: 1px solid var(--border);
  background: var(--bg-panel-2);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 13px;
  font-family: var(--sans);
  cursor: pointer;
  transition: background .15s, border-color .15s, color .15s;
}

.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }

.btn-danger { color: var(--danger); }

@media (hover: hover) {
  .btn:hover { border-color: var(--accent); background: #232936; }
  .btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
  .btn-danger:hover { border-color: var(--danger); background: rgba(229, 83, 75, 0.12); }
}

.btn:active { border-color: var(--accent); }
.btn-primary:active { background: var(--accent-hover); }
.btn-danger:active { border-color: var(--danger); }

/* ---------- Mobile Editor/Vorschau-Umschalter ---------- */
.mobile-tabs {
  display: none;
}

.mtab {
  flex: 1 1 0;
  min-height: 44px;
  padding: 10px 12px;
  font-size: 16px;
  font-family: var(--sans);
  font-weight: 600;
  background: var(--bg-panel-2);
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
}

.mtab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* ---------- Workspace ---------- */
.workspace {
  flex: 1 1 auto;
  display: flex;
  min-height: 0;
}

.pane {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}

.pane-editor { flex: 1 1 50%; border-right: 1px solid var(--border); }
.pane-preview { flex: 1 1 50%; }

.pane-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  background: var(--bg-panel-2);
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-dim);
}

.dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.dot-red { background: var(--red); }
.dot-yellow { background: var(--yellow); }
.dot-green { background: var(--green); }

.pane-title { margin-left: 6px; font-family: var(--mono); }

.status {
  margin-left: auto;
  font-size: 11px;
  color: var(--text-dim);
  background: var(--bg-panel);
  border: 1px solid var(--border);
  padding: 2px 8px;
  border-radius: 10px;
}

.status.ok { color: var(--green); border-color: rgba(63, 185, 80, 0.4); }
.status.err { color: var(--danger); border-color: rgba(229, 83, 75, 0.4); }

/* ---------- Editor ---------- */
.editor-wrap {
  position: relative;
  flex: 1 1 auto;
  display: flex;
  min-height: 0;
  background: var(--bg);
}

.line-numbers {
  flex: 0 0 auto;
  padding: 14px 8px 14px 12px;
  text-align: right;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.55;
  color: #4b5565;
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  user-select: none;
  overflow: hidden;
  white-space: pre;
}

.editor {
  flex: 1 1 auto;
  width: 100%;
  height: 100%;
  padding: 14px 14px;
  background: var(--bg);
  color: var(--text);
  border: none;
  outline: none;
  resize: none;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.55;
  tab-size: 2;
  white-space: pre;
  overflow: auto;
}

.editor::placeholder { color: #4b5565; }

/* ---------- Preview ---------- */
.preview {
  flex: 1 1 auto;
  width: 100%;
  border: none;
  background: #fff;
}

/* ---------- Statusbar ---------- */
.statusbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 16px;
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
  font-size: 11px;
  color: var(--text-dim);
  font-family: var(--mono);
}

/* ---------- Responsive ---------- */
@media (max-width: 820px) {
  .workspace { flex-direction: column; }
  .pane-editor { flex: 1 1 50%; border-right: none; border-bottom: 1px solid var(--border); }
  .pane-preview { flex: 1 1 50%; }
  .topbar { flex-direction: column; align-items: stretch; }
  .toolbar { justify-content: flex-start; }
}

/* ---------- Mobile (schmale Viewports): Editor/Vorschau-Tabs ---------- */
@media (max-width: 640px) {
  .mobile-tabs {
    display: flex;
    gap: 8px;
    padding: 8px 12px;
    background: var(--bg-panel);
    border-bottom: 1px solid var(--border);
  }

  /* Nur jeweils einen Bereich anzeigen */
  .workspace.show-editor .pane-preview { display: none; }
  .workspace.show-preview .pane-editor { display: none; }

  .pane { flex: 1 1 auto; }
  .pane-editor { border-right: none; border-bottom: none; }

  /* Tap-Ziele und Input-Font >= 16px (kein iOS-Zoom) */
  .topbar { padding: 8px 12px; }
  .toolbar { gap: 8px; }

  .btn { min-height: 44px; padding: 10px 16px; font-size: 15px; }

  select {
    min-height: 44px;
    font-size: 16px;
    padding: 10px 34px 10px 12px;
  }

  .editor { font-size: 16px; }
  .line-numbers { font-size: 16px; }
}