/* ── Reset & Base ───────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:          #0d1117;
  --bg-panel:    #161b22;
  --bg-header:   #0d1117;
  --bg-hover:    #1c2333;
  --border:      #30363d;
  --text:        #c9d1d9;
  --text-muted:  #8b949e;
  --accent:      #58a6ff;
  --accent-hover:#79b8ff;
  --green:       #3fb950;
  --red:         #f85149;
  --yellow:      #d29922;
  --font-mono:   'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
  --toolbar-h:   48px;
  --header-h:    32px;
  --radius:      6px;
}

html, body {
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 14px;
}

/* ── Toolbar ───────────────────────────────────────── */
.toolbar {
  height: var(--toolbar-h);
  background: var(--bg-header);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 12px;
  gap: 12px;
  user-select: none;
  flex-shrink: 0;
}

.toolbar-left {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.logo {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
  flex-shrink: 0;
}

.title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.toolbar-center {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.toolbar-right {
  margin-left: auto;
  flex-shrink: 0;
}

/* ── Buttons ───────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 12px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s ease;
}
.btn:hover { background: var(--bg-hover); border-color: var(--text-muted); }
.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-icon { font-size: 10px; }

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

.btn-danger {
  background: var(--red);
  color: #fff;
  border-color: var(--red);
}
.btn-danger:hover { background: #da3633; }

.btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--text-muted);
}
.btn-ghost:hover { color: var(--text); background: var(--bg-hover); }

.btn-small {
  padding: 2px 8px;
  font-size: 11px;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s;
}
.btn-small:hover { color: var(--text); border-color: var(--text-muted); }

/* ── Status indicator ──────────────────────────────── */
.status {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}
.status::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
}
.status.connected::before { background: var(--green); }
.status.running::before { background: var(--yellow); animation: pulse 1s infinite; }
.status.error::before { background: var(--red); }

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ── Workspace layout ──────────────────────────────── */
.workspace {
  display: flex;
  height: calc(100vh - var(--toolbar-h));
  overflow: hidden;
}

.panel {
  display: flex;
  flex-direction: column;
  min-width: 200px;
  overflow: hidden;
}

.panel-editor {
  flex: 55;
  border-right: 1px solid var(--border);
}

.panel-terminal {
  flex: 45;
}

.panel-header {
  height: var(--header-h);
  min-height: var(--header-h);
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  user-select: none;
}

.filename {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
}

.terminal-info {
  display: flex;
  align-items: center;
  gap: 8px;
}

.shortcut-hint {
  font-size: 11px;
  color: var(--text-muted);
  opacity: 0.6;
}

/* ── Resize handle ─────────────────────────────────── */
.resize-handle {
  width: 4px;
  cursor: col-resize;
  background: var(--border);
  transition: background 0.15s;
  flex-shrink: 0;
}
.resize-handle:hover,
.resize-handle.active {
  background: var(--accent);
}

/* ── Editor container ──────────────────────────────── */
#editor-container {
  flex: 1;
  overflow: hidden;
}

/* CodeMirror overrides */
.CodeMirror {
  height: 100% !important;
  font-family: var(--font-mono) !important;
  font-size: 14px !important;
  line-height: 1.5 !important;
  background: var(--bg) !important;
  color: var(--text) !important;
}
.CodeMirror-gutters {
  background: var(--bg) !important;
  border-right: 1px solid var(--border) !important;
}
.CodeMirror-linenumber { color: var(--text-muted) !important; }
.CodeMirror-cursor { border-left-color: var(--green) !important; }
.CodeMirror-selected { background: #264f78 !important; }
.CodeMirror-focused .CodeMirror-selected { background: #264f78 !important; }
.CodeMirror-activeline-background { background: rgba(255,255,255,0.03) !important; }
.CodeMirror-matchingbracket { color: var(--green) !important; border-bottom: 1px solid var(--green); }

/* C++ syntax colors */
.cm-s-cpp-dark .cm-keyword   { color: #ff7b72; }
.cm-s-cpp-dark .cm-atom      { color: #79c0ff; }
.cm-s-cpp-dark .cm-number    { color: #79c0ff; }
.cm-s-cpp-dark .cm-def       { color: #d2a8ff; }
.cm-s-cpp-dark .cm-variable  { color: #c9d1d9; }
.cm-s-cpp-dark .cm-type      { color: #ffa657; }
.cm-s-cpp-dark .cm-property  { color: #c9d1d9; }
.cm-s-cpp-dark .cm-operator  { color: #ff7b72; }
.cm-s-cpp-dark .cm-string    { color: #a5d6ff; }
.cm-s-cpp-dark .cm-comment   { color: #8b949e; font-style: italic; }
.cm-s-cpp-dark .cm-meta      { color: #ffa657; }
.cm-s-cpp-dark .cm-builtin   { color: #ffa657; }

/* ── Terminal container ────────────────────────────── */
#terminal-container {
  flex: 1;
  overflow: hidden;
  padding: 4px;
  background: var(--bg);
}

.xterm {
  height: 100%;
}

/* ── Command Reference ─────────────────────────────── */
.cmd-ref {
  border-top: 1px solid var(--border);
  background: var(--bg-panel);
  flex-shrink: 0;
}

.cmd-ref-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 12px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  cursor: pointer;
  user-select: none;
  transition: color 0.15s;
}
.cmd-ref-header:hover { color: var(--text); }

.cmd-ref-arrow {
  font-size: 10px;
  transition: transform 0.2s;
}
.cmd-ref.collapsed .cmd-ref-arrow {
  transform: rotate(-90deg);
}
.cmd-ref.collapsed .cmd-ref-body {
  display: none;
}

.cmd-ref-body {
  padding: 4px 12px 10px;
}

.cmd-ref-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.cmd-ref-section {}

.cmd-ref-title {
  font-size: 10px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.cmd {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  padding: 2px 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.cmd-flags {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 12px;
}
.cmd-flags span {
  font-size: 11px;
  color: var(--text-muted);
}
.cmd-flags code {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  margin-right: 4px;
}

/* ── Mobile tabs ───────────────────────────────────── */
.mobile-tabs {
  display: none;
  background: var(--bg-header);
  border-top: 1px solid var(--border);
}
.mobile-tab {
  flex: 1;
  padding: 10px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  text-align: center;
}
.mobile-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ── Responsive ────────────────────────────────────── */
@media (max-width: 768px) {
  .toolbar {
    padding: 0 8px;
    gap: 6px;
  }
  .title { display: none; }
  .btn {
    padding: 5px 8px;
    font-size: 12px;
  }
  .btn-ghost { display: none; }
  .shortcut-hint { display: none; }

  .workspace {
    flex-direction: column;
  }
  .resize-handle { display: none; }

  .panel-editor,
  .panel-terminal {
    flex: none;
    width: 100%;
    height: 100%;
    border-right: none;
  }

  .panel { display: none; }
  .panel.active { display: flex; }

  .mobile-tabs {
    display: flex;
  }

  .cmd-ref-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  #btn-compile, #btn-run { display: none; }
}

/* ── Scrollbar ─────────────────────────────────────── */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }