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

:root {
  --nav-bg:       #1a1a2e;
  --nav-border:   #2d2d4e;
  --toolbar-bg:   #16213e;
  --toolbar-border: #243354;
  --body-bg:      #0f0f1a;
  --pane-bg:      #1c1c2e;
  --pane-header:  #252540;
  --pane-border:  #2e2e50;
  --editor-bg:    #12121f;
  --output-bg:    #0d0d1a;
  --text:         #e0e0f0;
  --text-muted:   #8888aa;
  --text-dim:     #555575;
  --green:        #28a745;
  --green-hover:  #218838;
  --blue:         #0d6efd;
  --red:          #dc3545;
  --orange:       #fd7e14;
  --mono:         'Roboto Mono', 'Courier New', monospace;
  --sans:         'Roboto', Arial, sans-serif;
  --accent:       #4e9eff;
}

html, body {
  height: 100%;
  font-family: var(--sans);
  font-size: 14px;
  background: var(--body-bg);
  color: var(--text);
  overflow: hidden;
}

/* ── Navbar ── */
.navbar {
  height: 48px;
  background: var(--nav-bg);
  border-bottom: 1px solid var(--nav-border);
  display: flex;
  align-items: center;
  padding: 0 18px;
  gap: 24px;
  flex-shrink: 0;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: inherit;
}
.brand-icon { width: 24px; height: 24px; display: block; }
.brand-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.3px;
}
.brand-sub {
  font-size: 0.7rem;
  color: var(--text-muted);
  border-left: 1px solid var(--nav-border);
  padding-left: 10px;
  margin-left: 4px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.nav-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-link {
  font-size: 0.82rem;
  color: var(--text-muted);
  padding: 5px 12px;
  border-radius: 4px;
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
}
.nav-link:hover { color: #fff; background: rgba(255,255,255,0.06); }
.nav-link.active { color: var(--accent); }

/* ── Page ── */
.page {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 48px);
  overflow: hidden;
}

/* ── Toolbar ── */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  height: 46px;
  background: var(--toolbar-bg);
  border-bottom: 1px solid var(--toolbar-border);
  flex-shrink: 0;
  gap: 8px;
}

.toolbar-left {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.toolbar-right {
  font-size: 0.72rem;
  color: var(--text-dim);
  white-space: nowrap;
  flex-shrink: 0;
}

.lang-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--pane-border);
  border-radius: 4px;
  padding: 4px 10px;
  font-size: 0.82rem;
  font-weight: 500;
  color: #dde;
}
.lang-icon { width: 16px; height: 16px; display: block; }
.lang-version {
  font-size: 0.68rem;
  color: var(--text-muted);
  background: rgba(255,255,255,0.07);
  border-radius: 3px;
  padding: 1px 5px;
}

.toolbar-sep {
  width: 1px;
  height: 22px;
  background: var(--toolbar-border);
  flex-shrink: 0;
  margin: 0 2px;
}

.toolbar-label {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--sans);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 5px 14px;
  border-radius: 4px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, box-shadow 0.15s;
  white-space: nowrap;
}

.btn-run {
  background: var(--green);
  color: #fff;
  border-color: var(--green);
}
.btn-run:hover {
  background: var(--green-hover);
  border-color: var(--green-hover);
  box-shadow: 0 0 0 3px rgba(40,167,69,0.25);
}
.btn-run:active { transform: scale(0.98); }
.btn-run:disabled { opacity: 0.55; cursor: not-allowed; }

.btn-clear {
  background: transparent;
  color: var(--text-muted);
  border-color: var(--pane-border);
}
.btn-clear:hover {
  background: rgba(220,53,69,0.1);
  border-color: var(--red);
  color: #f88;
}

.btn-enter {
  background: var(--blue);
  color: #fff;
  border: none;
  font-size: 0.78rem;
  padding: 5px 12px;
  border-radius: 3px;
  cursor: pointer;
  font-weight: 500;
}
.btn-enter:hover { background: #0b5ed7; }

/* ── Select ── */
.select-picker {
  font-family: var(--sans);
  font-size: 0.8rem;
  background: var(--pane-bg);
  color: var(--text);
  border: 1px solid var(--pane-border);
  border-radius: 4px;
  padding: 5px 8px;
  cursor: pointer;
  outline: none;
}
.select-picker:focus { border-color: var(--accent); }

kbd {
  display: inline-block;
  background: var(--pane-header);
  border: 1px solid var(--pane-border);
  border-radius: 3px;
  padding: 1px 5px;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* ── Workspace ── */
.workspace {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
}

/* ── Panes ── */
.pane {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 60px;
}

.pane-editor  { flex: 0 0 60%; }
.pane-output  { flex: 1 1 0; }

.pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  height: 34px;
  background: var(--pane-header);
  border-bottom: 1px solid var(--pane-border);
  flex-shrink: 0;
}
.pane-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: #aab;
  text-transform: uppercase;
  letter-spacing: 0.6px;
}
.pane-meta {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-dim);
}
.pane-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  flex-shrink: 0;
  transition: background 0.2s;
}
.status-dot.error  { background: var(--red); }
.status-dot.running { background: var(--orange); animation: pulse 0.8s ease-in-out infinite alternate; }
@keyframes pulse { from { opacity:0.5; } to { opacity:1; } }

/* ── Editor textarea ── */
#editor {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.6;
  background: transparent;
  color: transparent;
  caret-color: #ffffffcc;
  border: none;
  outline: none;
  padding: 14px 18px;
  resize: none;
  tab-size: 4;
  box-sizing: border-box;
  overflow: auto;
  z-index: 1;
}
#editor::selection { background: rgba(78,158,255,0.3); }

/* ── Resize handle ── */
.resize-handle {
  height: 5px;
  background: var(--pane-border);
  cursor: ns-resize;
  flex-shrink: 0;
  transition: background 0.15s;
  position: relative;
}
.resize-handle::after {
  content: '';
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 40px;
  height: 3px;
  border-top: 1px solid var(--text-dim);
  border-bottom: 1px solid var(--text-dim);
}
.resize-handle:hover { background: var(--accent); }

/* ── Output ── */
.pane-output { background: var(--output-bg); }

#output {
  flex: 1;
  font-family: var(--mono);
  font-size: 0.8rem;
  line-height: 1.65;
  padding: 12px 18px;
  overflow-y: auto;
  overflow-x: hidden;
  white-space: pre-wrap;
  word-break: break-word;
  color: #c0cce8;
}

.out-line { padding: 1px 0; }
.out-line.error   { color: #f07070; }
.out-line.success { color: #5dbb63; }
.out-line.info    { color: #888; font-style: italic; }
.out-line.value   { color: #c0cce8; }
.out-line.prompt-line { color: #7bbfff; }

/* ── Fish input row ── */
.input-row {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  background: #181828;
  border-top: 1px solid var(--pane-border);
  flex-shrink: 0;
}
.input-row.visible { display: flex; }

.input-prompt-label {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: #7bbfff;
  flex-shrink: 0;
  max-width: 220px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.input-row input {
  flex: 1;
  font-family: var(--mono);
  font-size: 0.8rem;
  background: var(--editor-bg);
  color: var(--text);
  border: 1px solid var(--pane-border);
  border-radius: 3px;
  padding: 5px 10px;
  outline: none;
}
.input-row input:focus { border-color: var(--accent); }

/* ── Footer bar ── */
.footbar {
  height: 24px;
  background: var(--nav-bg);
  border-top: 1px solid var(--nav-border);
  display: flex;
  align-items: center;
  padding: 0 14px;
  gap: 10px;
  font-size: 0.68rem;
  color: var(--text-dim);
  flex-shrink: 0;
}
.footbar .sep { color: var(--nav-border); }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--pane-border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #44446a; }

/* ── Responsive ── */
@media (max-width: 600px) {
  .pane-editor { flex-basis: 50%; }
  .brand-sub, .nav-right, .toolbar-right { display: none; }
}

/* ── Editor highlight overlay ── */
.editor-wrap {
  position: relative;
  flex: 1;
  overflow: hidden;
}

.highlight-layer {
  position: absolute;
  inset: 0;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.6;
  padding: 14px 18px;
  box-sizing: border-box;
  white-space: pre;
  word-wrap: normal;
  overflow: auto;
  pointer-events: none;
  z-index: 0;
  color: #c8d0e8;
  tab-size: 4;
}

/* Syntax token colours — matching VS Code extension scopes */
.hl-comment    { color: #6a9955; font-style: italic; }   /* comment.line */
.hl-string     { color: #ce9178; }                        /* string.quoted.double */
.hl-escape     { color: #d7ba7d; }                        /* constant.character.escape */
.hl-interp     { color: #9cdcfe; text-decoration: underline; } /* variable.other.interpolated */
.hl-keyword    { color: #c586c0; }                        /* keyword.control */
.hl-decl       { color: #569cd6; }                        /* keyword.declaration (let/mut) */
.hl-fn-kw      { color: #569cd6; }                        /* keyword.declaration.function (dive) */
.hl-pod-kw     { color: #569cd6; }                        /* keyword.declaration.class (pod) */
.hl-type       { color: #4ec9b0; }                        /* storage.type */
.hl-builtin    { color: #dcdcaa; }                        /* support.function.builtin */
.hl-bool       { color: #569cd6; }                        /* constant.language.boolean */
.hl-number     { color: #b5cea8; }                        /* constant.numeric */
.hl-fn-name    { color: #dcdcaa; }                        /* entity.name.function */
.hl-pod-name   { color: #4ec9b0; }                        /* entity.name.type */
.hl-op         { color: #d4d4d4; }                        /* keyword.operator */
.hl-arrow      { color: #c586c0; }                        /* keyword.operator.arrow */