/* ============================================================
   CSS Custom Properties — Dark / Light Themes
   ============================================================ */
:root {
  --bg-app:      #1e1e1e;
  --bg-bar:      #333333;
  --bg-sidebar:  #252526;
  --bg-tabs:     #252526;
  --bg-tab:      #2d2d2d;
  --bg-tab-active: #1e1e1e;
  --bg-terminal: #1e1e1e;
  --border:      #1a1a1a;
  --border-drag: #414141;
  --text:        #cccccc;
  --text-dim:    #858585;
  --text-bright: #ffffff;
  --hover:       #2a2d2e;
  --active-item: #37373d;
  --accent:      #007acc;
}

body.light {
  /* Exact VS Code Light+ colors */
  --bg-app:        #ffffff;   /* editor.background */
  --bg-bar:        #dddddd;   /* titleBar.activeBackground */
  --bg-sidebar:    #f3f3f3;   /* sideBar.background */
  --bg-tabs:       #f3f3f3;   /* editorGroupHeader.tabsBackground */
  --bg-tab:        #ececec;   /* tab.inactiveBackground */
  --bg-tab-active: #ffffff;   /* tab.activeBackground */
  --bg-terminal:   #ffffff;   /* terminal.background (VS Code Light uses white) */
  --border:        #e5e5e5;   /* sideBar.border / editor borders */
  --border-drag:   #c8c8c8;
  --text:          #3b3b3b;   /* editor foreground */
  --text-dim:      #6e7681;   /* tab.inactiveForeground */
  --text-bright:   #000000;
  --hover:         #e8e8e8;   /* list.hoverBackground */
  --active-item:   #d6ebff;   /* list.activeSelectionBackground (light blue) */
  --accent:        #005fb8;   /* focusBorder / tab.activeBorderTop */
}

/* VS Code Light+ — Activity Bar stays dark (exact VSCode behaviour) */
body.light .activity-bar {
  background: #2c2c2c;        /* activityBar.background */
  border-right-color: #2c2c2c;
}
body.light .action-item       { color: #ffffff80; }
body.light .action-item:hover { color: #ffffff; }
body.light .action-item.active {
  color: #ffffff;
  border-left-color: #ffffff;
}

/* Active file in sidebar */
body.light .file-item.active {
  background: var(--accent);
  color: #ffffff;
}
body.light .file-item.active .delete-file-btn { color: #ffffff99; }

/* Tabs — VS Code Light+ top-border accent on active */
body.light .tab            { color: #6e7681; background: #ececec; }
body.light .tab.active     { color: #000000; background: #ffffff; border-top-color: #005fb8; }

/* Terminal — VS Code Light uses white terminal with dark text */
body.light .terminal-panel  { background: #ffffff; }
body.light .terminal-topbar {
  background: #f3f3f3;
  border-bottom: 1px solid #e5e5e5;
}
body.light .term-tab        { color: #6e7681; }
body.light .term-tab.active {
  color: #000000;
  border-bottom-color: #005fb8;
}
body.light .status-text     { color: #6e7681; }
body.light .clear-btn       { color: #6e7681; border-color: #c8c8c8; }
body.light .clear-btn:hover { color: #3b3b3b; border-color: #999; background: #e8e8e8; }
body.light .drag-handle     { background: #c8c8c8; }
body.light .drag-handle:hover,
body.light .drag-handle.dragging { background: #005fb8; }

/* Terminal output text for white terminal */
body.light .terminal-output          { color: #000000; }
body.light .terminal-output .out     { color: #000000; }
body.light .terminal-output .err,
body.light .terminal-output .errblock{ color: #cd3131; }  /* VS Code terminal red */
body.light .terminal-output .sys     { color: #6e7681; font-style: italic; }

/* Section header in sidebar */
body.light .section-header { color: #6f6f6f; }

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

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 13px;
  background: var(--bg-app);
  color: var(--text);
}

/* ============================================================
   App Shell — full-screen column
   ============================================================ */
.app-shell {
  display: flex;
  flex-direction: column;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

/* ============================================================
   Title Bar
   ============================================================ */
.titlebar {
  flex-shrink: 0;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: var(--bg-bar);
  border-bottom: 1px solid var(--border);
  transition: background 0.25s;
}
.titlebar-left  { position: absolute; left: 15px; display: flex; align-items: center; }
.titlebar-right { position: absolute; right: 12px; display: flex; align-items: center; }
.titlebar-title { font-size: 13px; font-weight: 500; color: var(--text); white-space: nowrap; }

/* ============================================================
   Workspace — row (activity bar | sidebar | main)
   ============================================================ */
.workspace {
  flex: 1;
  display: flex;
  overflow: hidden;          /* critical — keeps children from overflowing */
}

/* ============================================================
   Activity Bar
   ============================================================ */
.activity-bar {
  flex-shrink: 0;
  width: 48px;
  background: var(--bg-bar);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 8px;
  border-right: 1px solid var(--border);
}
.action-item {
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; color: var(--text-dim);
  transition: color 0.15s;
}
.action-item:hover { color: var(--text); }
.action-item.active { color: var(--text-bright); border-left: 2px solid var(--text-bright); }
.action-item svg { width: 22px; height: 22px; }

/* ============================================================
   Sidebar
   ============================================================ */
.sidebar {
  flex-shrink: 0;
  width: 240px;
  background: var(--bg-sidebar);
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  overflow: hidden;
}
.sidebar-title {
  padding: 10px 16px 4px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--text);
}
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 3px 10px 3px 16px;
  font-size: 11px;
  font-weight: 700;
  color: var(--text);
}
.section-label {
  display: flex; align-items: center; gap: 4px;
}
.file-list {
  flex: 1;
  overflow-y: auto;
  padding-top: 4px;
}
.file-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px 4px 24px;
  cursor: pointer;
  color: var(--text);
  user-select: none;
}
.file-item:hover    { background: var(--hover); }
.file-item.active   { background: var(--active-item); color: var(--text-bright); }
.delete-file-btn {
  margin-left: auto;
  display: none;
  background: none; border: none;
  color: var(--text-dim);
  cursor: pointer; padding: 0 4px;
  font-size: 12px;
  line-height: 1;
}
.file-item:hover .delete-file-btn { display: block; }
.delete-file-btn:hover { color: #f48771; }

/* ============================================================
   Main Content — column (tabs | editor | handle | terminal)
   The KEY fix: this is a FLEX COLUMN with overflow hidden.
   Each child that must shrink needs min-height: 0.
   ============================================================ */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;          /* do not remove */
  background: var(--bg-app);
}

/* Tabs Bar */
.tabs-bar {
  flex-shrink: 0;            /* never shrink */
  height: 35px;
  display: flex;
  align-items: stretch;
  background: var(--bg-tabs);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}
.tabs-list {
  flex: 1;
  display: flex;
  overflow-x: auto;
  overflow-y: hidden;
}
.tab {
  flex-shrink: 0;
  height: 100%;
  padding: 0 14px;
  display: flex; align-items: center; gap: 6px;
  font-size: 13px;
  color: var(--text-dim);
  background: var(--bg-tab);
  cursor: pointer;
  border-right: 1px solid var(--border);
  white-space: nowrap;
  transition: background 0.15s, color 0.15s;
}
.tab.active {
  background: var(--bg-tab-active);
  color: var(--text-bright);
  border-top: 2px solid var(--accent);
}

/* Toolbar (run/stop/save) */
.toolbar {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 10px;
}
.save-label {
  font-size: 11px;
  color: var(--text-dim);
  opacity: 0;
  transition: opacity 0.4s;
}
.save-label.visible { opacity: 1; }

/* ============================================================
   Editor Wrap — grows to fill remaining space
   ============================================================ */
.editor-wrap {
  flex: 1;
  min-height: 0;             /* critical for flex shrink */
  overflow: hidden;
  display: flex;
}
.CodeMirror {
  flex: 1;
  height: 100% !important;
  font-family: 'Consolas', 'Courier New', monospace !important;
  font-size: 14px;
  line-height: 1.5;
}
.CodeMirror-gutters {
  border-right: none !important;
}

/* ============================================================
   Drag Handle
   ============================================================ */
.drag-handle {
  flex-shrink: 0;
  height: 5px;
  background: var(--border-drag);
  cursor: ns-resize;
  transition: background 0.15s;
}
.drag-handle:hover,
.drag-handle.dragging { background: var(--accent); }

/* ============================================================
   Terminal Panel
   flex-shrink: 0 + explicit height = it NEVER disappears.
   ============================================================ */
.terminal-panel {
  flex-shrink: 0;            /* NEVER collapse */
  height: 28%;               /* default height */
  min-height: 90px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg-terminal);
  border-top: 1px solid var(--border);
}
.terminal-topbar {
  flex-shrink: 0;
  height: 34px;
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 16px;
  border-bottom: 1px solid var(--border);
}
.term-tab {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--text-dim);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
}
.term-tab.active { color: var(--text); border-bottom-color: var(--text); }
.status-badge {
  margin-left: auto;
  display: flex; align-items: center; gap: 6px;
}
.status-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: #555;
  transition: background 0.3s;
}
.status-dot.loading { background: #f59e0b; animation: blink 1.4s infinite; }
.status-dot.ready   { background: #10b981; }
.status-dot.running { background: var(--accent); animation: blink 0.9s infinite; }
.status-dot.error   { background: #f48771; }
.status-text { font-size: 11px; color: var(--text-dim); }

.clear-btn {
  margin-left: 12px;
  background: none;
  border: 1px solid var(--border-drag);
  color: var(--text-dim);
  cursor: pointer;
  font-size: 11px;
  padding: 2px 9px;
  border-radius: 3px;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.clear-btn:hover {
  color: var(--text);
  border-color: var(--text-dim);
  background: var(--hover);
}

@keyframes blink {
  0%, 100% { opacity: .5; }
  50%       { opacity: 1; }
}

.terminal-output {
  flex: 1;
  padding: 8px 16px;
  overflow-y: auto;
  font-family: 'Consolas', 'Courier New', monospace;
  font-size: 13px;
  line-height: 1.5;
  color: var(--text);
  display: flex;
  flex-direction: column;
}
.terminal-output span      { white-space: pre-wrap; }
.terminal-output .out      { color: #d4d4d4; }
.terminal-output .err,
.terminal-output .errblock { color: #f48771; }
.terminal-output .sys      { color: #858585; font-style: italic; }

/* In light theme the terminal stays dark, so terminal text is always light */
body.light .terminal-output .out      { color: #d4d4d4; }
body.light .terminal-output .err,
body.light .terminal-output .errblock { color: #f48771; }
body.light .terminal-output .sys      { color: #858585; }

/* ============================================================
   Shared Icon Button
   ============================================================ */
.icon-btn {
  background: none;
  border: none;
  color: var(--text);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  padding: 4px;
  border-radius: 4px;
  transition: background 0.15s;
}
.icon-btn:hover    { background: var(--hover); }
.icon-btn:disabled { opacity: 0.4; cursor: default; }
.icon-btn.hidden   { display: none !important; }

/* ── Action Buttons (Run / Stop) with text ── */
.action-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border-radius: 4px;
  border: none;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .03em;
  transition: opacity 0.15s, transform 0.1s;
}
.action-btn:active { transform: scale(.96); }
.action-btn:disabled { opacity: 0.4; cursor: default; }
.action-btn.hidden { display: none !important; }

.run-btn  { background: #1a7a3a; color: #c8f0d4; }
.run-btn:hover  { background: #1f8f44; }

.stop-btn { background: #7a2020; color: #f8c8c8; }
.stop-btn:hover { background: #963030; }

/* ============================================================
   Toasts
   ============================================================ */
.toast-container {
  position: fixed; bottom: 24px; right: 24px;
  z-index: 9999;
  display: flex; flex-direction: column; gap: 8px;
}
.toast {
  background: var(--bg-sidebar);
  color: var(--text);
  padding: 10px 14px;
  border-left: 3px solid var(--accent);
  border: 1px solid var(--border);
  box-shadow: 0 4px 12px rgba(0,0,0,.35);
  font-size: 13px;
  animation: slideIn .25s ease;
  border-radius: 2px;
}
@keyframes slideIn {
  from { transform: translateX(110%); opacity: 0; }
  to   { transform: translateX(0);    opacity: 1; }
}