*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:       #0c0c0f;
  --surface:  #111115;
  --panel:    #16161b;
  --border:   #222228;
  --border2:  #2e2e38;
  --accent:   #7c6aff;
  --accent-d: #5a4de0;
  --text:     #d8d8e8;
  --dim:      #666680;
  --success:  #3ddd8a;
  --warn:     #f0a030;
  --err:      #ff4d6d;
  --mono:     'JetBrains Mono', monospace;
  --ui:       'Outfit', sans-serif;
  --r:        5px;
}

html, body { height: 100%; overflow: hidden; background: var(--bg); color: var(--text); font-family: var(--mono); font-size: 13px; }
* { scrollbar-width: thin; scrollbar-color: var(--border2) transparent; }

/* ── Layout ── */
#app  { display: flex; flex-direction: column; height: 100vh; }
#body { display: flex; flex: 1; overflow: hidden; }

/* ── Titlebar ── */
#titlebar {
  height: 42px; flex-shrink: 0;
  display: flex; align-items: center; gap: 8px;
  padding: 0 12px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.logo { font-family: var(--ui); font-size: 16px; font-weight: 900; letter-spacing: -0.5px; color: var(--text); }
.logo span { color: var(--accent); }
.spacer { flex: 1; }

#run-info { font-size: 11px; color: var(--dim); }

#status-wrap { display: flex; align-items: center; gap: 5px; font-size: 11px; color: var(--dim); }
.dot { width: 6px; height: 6px; border-radius: 50%; background: var(--dim); flex-shrink: 0; transition: background .3s; }
.dot.ok   { background: var(--success); box-shadow: 0 0 6px var(--success); }
.dot.err  { background: var(--err); }
.dot.spin { background: var(--warn); animation: blink 1s infinite; }
@keyframes blink { 0%,100%{opacity:1}50%{opacity:.2} }

.hdr-btn {
  background: none; border: 1px solid var(--border2); border-radius: var(--r);
  color: var(--dim); cursor: pointer; padding: 4px 8px; font-size: 13px;
  transition: color .1s, border-color .1s;
}
.hdr-btn:hover { color: var(--text); border-color: var(--dim); }
#btn-run {
  background: var(--accent); border: none; border-radius: var(--r);
  color: #fff; font-family: var(--mono); font-size: 12px; font-weight: 600;
  padding: 5px 14px; cursor: pointer; transition: background .1s;
}
#btn-run:hover    { background: var(--accent-d); }
#btn-run:disabled { opacity: .4; cursor: not-allowed; }

/* ── Sidebar ── */
#sidebar {
  width: 200px; flex-shrink: 0;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
  overflow: hidden;
}
#sidebar-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 10px; border-bottom: 1px solid var(--border);
  font-size: 10px; font-weight: 600; letter-spacing: 1px;
  text-transform: uppercase; color: var(--dim); flex-shrink: 0;
}
.sidebar-actions { display: flex; gap: 2px; }
.sbar-btn {
  background: none; border: none; cursor: pointer;
  color: var(--dim); font-size: 15px; padding: 1px 5px;
  border-radius: 3px; line-height: 1;
  transition: color .1s, background .1s;
}
.sbar-btn:hover { color: var(--accent); background: rgba(124,106,255,.1); }
#file-list { flex: 1; overflow-y: auto; padding: 3px 0; }

/* tree nodes */
.tf {
  display: flex; align-items: center; gap: 6px;
  padding: 4px 10px; cursor: pointer; font-size: 12px;
  border-left: 2px solid transparent;
  transition: background .08s;
  user-select: none;
}
.tf:hover { background: rgba(255,255,255,.04); }
.tf.active { background: rgba(124,106,255,.1); border-left-color: var(--accent); color: #c4b9ff; }
.tf .tf-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tf .tf-x { opacity: 0; color: var(--dim); font-size: 12px; transition: opacity .1s; line-height: 1; }
.tf:hover .tf-x { opacity: 1; }
.tf .tf-x:hover { color: var(--err); }

.td-head {
  display: flex; align-items: center; gap: 5px;
  padding: 4px 10px; cursor: pointer; font-size: 12px;
  color: var(--dim); transition: background .08s; user-select: none;
}
.td-head:hover { background: rgba(255,255,255,.04); }
.td-head .chev { font-size: 9px; transition: transform .12s; }
.td-head.open .chev { transform: rotate(90deg); }
.td-head .td-x { opacity: 0; color: var(--dim); font-size: 12px; margin-left: auto; }
.td-head:hover .td-x { opacity: 1; }
.td-head .td-x:hover { color: var(--err); }
.td-children { padding-left: 12px; }
.td-children.closed { display: none; }
.td-head.drag-over { background: rgba(124,106,255,.25) !important; outline: 1px solid var(--accent); }

/* ── Editor ── */
#editor-col {
  flex: 1; display: flex; flex-direction: column;
  overflow: hidden; position: relative; min-width: 0;
  border-right: 1px solid var(--border);
}
#editor-tabs {
  display: flex; overflow-x: auto; overflow-y: hidden;
  background: var(--surface); border-bottom: 1px solid var(--border);
  height: 33px; flex-shrink: 0;
}
#editor-tabs::-webkit-scrollbar { height: 2px; }
.etab {
  display: flex; align-items: center; gap: 5px;
  padding: 0 12px; height: 100%; font-size: 12px; cursor: pointer;
  white-space: nowrap; border-right: 1px solid var(--border);
  color: var(--dim); transition: color .1s, background .1s; flex-shrink: 0;
}
.etab:hover { color: var(--text); }
.etab.active { color: var(--text); background: var(--bg); }
.etab .ex { font-size: 13px; color: transparent; transition: color .1s; }
.etab:hover .ex { color: var(--dim); }
.etab .ex:hover { color: var(--err) !important; }
#monaco-container { flex: 1; min-height: 0; }
#editor-placeholder {
  position: absolute; inset: 33px 0 0 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 10px; color: var(--dim); background: var(--bg);
}
.loader {
  width: 20px; height: 20px; border-radius: 50%;
  border: 2px solid var(--border2); border-top-color: var(--accent);
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Resize handle ── */
#resize-handle {
  width: 5px; flex-shrink: 0; cursor: col-resize;
  background: var(--border);
  transition: background .15s;
  position: relative; z-index: 10;
}
#resize-handle:hover, #resize-handle.dragging { background: var(--accent); }

/* ── Sidebar resize handle ── */
#sidebar-resize-handle {
  width: 5px; flex-shrink: 0; cursor: col-resize;
  background: var(--border);
  transition: background .15s;
  position: relative; z-index: 10;
}
#sidebar-resize-handle:hover, #sidebar-resize-handle.dragging { background: var(--accent); }

/* ── Output ── */
#output-col {
  width: 380px; min-width: 180px; max-width: 80vw; flex-shrink: 0;
  display: flex; flex-direction: column; overflow: hidden;
  background: var(--surface);
}
#output-header {
  display: flex; align-items: center; gap: 2px;
  padding: 0 8px; height: 33px; flex-shrink: 0;
  border-bottom: 1px solid var(--border);
}
#output-tabs { display: flex; gap: 2px; }
.o-tab {
  background: none; border: none; cursor: pointer;
  font-family: var(--mono); font-size: 11px; color: var(--dim);
  padding: 4px 10px; border-radius: var(--r);
  transition: color .1s, background .1s;
}
.o-tab:hover  { color: var(--text); }
.o-tab.active { color: var(--accent); background: rgba(124,106,255,.1); }
#exit-badge { font-size: 11px; color: var(--dim); }
#exit-badge.ok  { color: var(--success); }
#exit-badge.err { color: var(--err); }

#panel-terminal { flex: 1; overflow: hidden; padding: 4px 2px; }
#xterm-container { width: 100%; height: 100%; }

#panel-preview { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
#preview-bar {
  display: flex; align-items: center; gap: 6px;
  padding: 4px 8px; border-bottom: 1px solid var(--border); flex-shrink: 0;
}
#live-badge { font-size: 10px; color: var(--success); flex-shrink: 0; }
#preview-url-wrap {
  flex: 1; display: flex; align-items: center;
  background: var(--bg); border: 1px solid var(--border2); border-radius: var(--r);
  padding: 0 8px; gap: 4px; height: 26px;
  transition: border-color .15s;
}
#preview-url-wrap:focus-within { border-color: var(--accent); }
#preview-url-scheme { font-size: 11px; color: var(--dim); flex-shrink: 0; user-select: none; }
#preview-url {
  flex: 1; background: transparent; border: none; outline: none;
  color: var(--text); font-family: var(--mono); font-size: 11px;
}
#preview-url::placeholder { color: rgba(102,102,128,.5); }
#btn-devtools { flex-shrink: 0; }
#btn-devtools.active { color: var(--accent); border-color: var(--accent); }
#preview-frame { flex: 1; border: none; background: #fff; }

#panel-stdin { flex: 1; display: flex; flex-direction: column; padding: 8px; gap: 6px; overflow: hidden; }
#panel-stdin label { font-size: 11px; color: var(--dim); }
#stdin-input {
  flex: 1; background: var(--panel); border: 1px solid var(--border2);
  color: var(--text); font-family: var(--mono); font-size: 12px;
  padding: 8px; border-radius: var(--r); resize: none; outline: none;
}
#stdin-input:focus { border-color: var(--accent); }

.hidden { display: none !important; }

/* ── Settings ── */
#settings-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,.65); z-index: 100;
  display: flex; align-items: center; justify-content: center;
}
#settings-modal {
  background: var(--panel); border: 1px solid var(--border2);
  border-radius: 10px; width: 480px; max-width: 95vw; max-height: 80vh;
  display: flex; flex-direction: column;
  box-shadow: 0 24px 64px rgba(0,0,0,.6);
  overflow: hidden;
}
#settings-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 18px; border-bottom: 1px solid var(--border);
  font-family: var(--ui); font-size: 14px; font-weight: 700; flex-shrink: 0;
}
#btn-close-settings { background: none; border: none; color: var(--dim); font-size: 16px; cursor: pointer; }
#btn-close-settings:hover { color: var(--err); }
#settings-body { overflow-y: auto; padding: 14px 18px; display: flex; flex-direction: column; gap: 20px; }

.sg { display: flex; flex-direction: column; gap: 8px; }
.sg-title { font-size: 11px; font-weight: 600; letter-spacing: .8px; text-transform: uppercase; color: var(--dim); }
.sg-note  { font-weight: 400; text-transform: none; letter-spacing: 0; }
.sr {
  display: flex; align-items: center; gap: 10px;
  padding: 7px 0; border-bottom: 1px solid var(--border);
}
.sr label { font-size: 12px; color: var(--dim); min-width: 110px; }
.sr input[type=range] { flex: 1; accent-color: var(--accent); }
.sr select, .sr input[type=text] {
  flex: 1; background: var(--surface); border: 1px solid var(--border2);
  color: var(--text); font-family: var(--mono); font-size: 12px;
  padding: 4px 8px; border-radius: var(--r); outline: none;
}
.sr select:focus, .sr input[type=text]:focus { border-color: var(--accent); }
.sr input[type=checkbox] { width: 15px; height: 15px; accent-color: var(--accent); }

/* lib/runtime rows */
.lib-row {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 0; border-bottom: 1px solid var(--border);
}
.lib-info { flex: 1; }
.lib-name { font-size: 12px; }
.lib-desc { font-size: 11px; color: var(--dim); margin-top: 2px; }
.lib-size { font-size: 11px; color: var(--dim); white-space: nowrap; }
.lib-btn {
  background: var(--surface); border: 1px solid var(--border2); border-radius: var(--r);
  color: var(--text); font-family: var(--mono); font-size: 11px;
  padding: 4px 10px; cursor: pointer; white-space: nowrap;
  transition: border-color .1s, color .1s;
}
.lib-btn:hover   { border-color: var(--accent); color: var(--accent); }
.lib-btn.done    { border-color: var(--success); color: var(--success); }
.lib-btn.loading { border-color: var(--warn); color: var(--warn); animation: blink 1s infinite; }

/* ── File tree icons ── */
.file-icon { width:16px; text-align:center; flex-shrink:0; }
.folder-icon { color:#f0a030; font-size:12px; width:16px; text-align:center; flex-shrink:0; }
.lang-icon { font-size:11px; }
.td-head .chev { font-size:8px; transition:transform .15s; color:var(--dim); }
.td-head.open .chev { transform:rotate(90deg); }
.td-head.open .folder-icon { color:#ffbb50; }
.td-x { opacity:0; color:var(--dim); font-size:11px; margin-left:auto; cursor:pointer; padding:2px 4px; border-radius:3px; transition:opacity .1s,color .1s; }
.td-head:hover .td-x, .tf:hover .tf-x { opacity:1; }
.td-x:hover, .tf-x:hover { color:var(--err)!important; }

/* ── Modal overlay ── */
#modal-overlay {
  position:fixed; inset:0; z-index:200;
  display:flex; align-items:center; justify-content:center;
  background:rgba(4,4,8,.82);
  backdrop-filter:blur(12px) saturate(0.6);
  animation:overlayIn .18s ease both;
}
@keyframes overlayIn { from{opacity:0} to{opacity:1} }

/* ── Modal card ── */
#modal {
  position:relative; overflow:hidden;
  width:420px; max-width:94vw;
  background:#0f0f14;
  border:1px solid rgba(255,255,255,.08);
  border-radius:20px;
  box-shadow:0 0 0 1px rgba(255,255,255,.04), 0 40px 100px rgba(0,0,0,.9);
  animation:modalIn .22s cubic-bezier(.16,1,.3,1) both;
  display:flex; flex-direction:column;
}
@keyframes modalIn {
  from { opacity:0; transform:scale(.94) translateY(16px); }
  to   { opacity:1; transform:scale(1) translateY(0); }
}

/* ── Ambient glow ── */
#modal-glow {
  position:absolute; top:-60px; left:50%; transform:translateX(-50%);
  width:280px; height:200px; border-radius:50%;
  background:radial-gradient(ellipse, var(--glow-color, rgba(124,106,255,.3)) 0%, transparent 70%);
  pointer-events:none; z-index:0;
  transition:background 0.4s ease;
  filter:blur(20px);
}

/* ── Hero section ── */
#modal-hero {
  position:relative; z-index:1;
  display:flex; align-items:center; gap:16px;
  padding:24px 24px 20px;
}
#modal-icon-ring {
  width:56px; height:56px; border-radius:16px; flex-shrink:0;
  display:flex; align-items:center; justify-content:center;
  font-size:24px;
  background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.1);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.1), 0 8px 24px rgba(0,0,0,.4);
  transition:background .3s, border-color .3s, box-shadow .3s;
}
#modal-icon {
  transition:transform .2s cubic-bezier(.34,1.56,.64,1), opacity .15s;
}
#modal-hero-text { flex:1; min-width:0; }
#modal-lang-name {
  font-family:var(--ui); font-size:20px; font-weight:800;
  color:var(--text); letter-spacing:-.4px; line-height:1.1;
  transition:color .3s;
}
#modal-lang-ext {
  font-family:var(--mono); font-size:11px; color:var(--dim);
  margin-top:3px; letter-spacing:.5px;
}
#modal-support-badge {
  font-size:10px; font-weight:700; letter-spacing:.8px; text-transform:uppercase;
  padding:4px 10px; border-radius:20px; flex-shrink:0;
  transition:all .25s;
}
#modal-support-badge.sup-yes { color:#3ddd8a; background:rgba(61,221,138,.12); border:1px solid rgba(61,221,138,.25); }
#modal-support-badge.sup-view{ color:#f0a030; background:rgba(240,160,48,.12);  border:1px solid rgba(240,160,48,.25); }
#modal-support-badge.sup-no  { color:#ff4d6d; background:rgba(255,77,109,.12);  border:1px solid rgba(255,77,109,.25); }

/* ── Divider ── */
#modal-divider {
  height:1px; background:rgba(255,255,255,.06); margin:0;
  position:relative; z-index:1;
}

/* ── Input ── */
#modal-input-wrap {
  position:relative; z-index:1;
  display:flex; align-items:center; gap:10px;
  margin:16px 20px 0;
  background:rgba(255,255,255,.05);
  border:1px solid rgba(255,255,255,.1);
  border-radius:10px;
  padding:0 14px;
  transition:border-color .15s, box-shadow .15s, background .15s;
}
#modal-input-wrap:focus-within {
  background:rgba(255,255,255,.07);
  border-color:var(--input-glow, rgba(124,106,255,.6));
  box-shadow:0 0 0 3px var(--input-shadow, rgba(124,106,255,.12));
}
.modal-input-icon {
  color:var(--dim); font-size:12px; flex-shrink:0;
}
#modal-input {
  flex:1; background:transparent; border:none; outline:none;
  color:var(--text); font-family:var(--mono); font-size:14px;
  padding:13px 0; letter-spacing:.2px;
}
#modal-input::placeholder { color:rgba(102,102,128,.6); }

/* ── Info bar ── */
#modal-info-bar {
  position:relative; z-index:1;
  display:flex; align-items:center; gap:10px;
  margin:10px 20px 0;
  padding:10px 14px;
  background:rgba(255,255,255,.03);
  border:1px solid rgba(255,255,255,.06);
  border-radius:8px;
  font-size:11px; color:var(--dim);
  animation:infoIn .2s ease both;
}
@keyframes infoIn { from{opacity:0;transform:translateY(-4px)} to{opacity:1;transform:translateY(0)} }
#modal-si-img {
  width:16px; height:16px; object-fit:contain; flex-shrink:0; border-radius:2px;
}
#modal-si-img.hidden { display:none; }
#modal-info-msg { line-height:1.4; }

/* ── Actions ── */
#modal-actions {
  position:relative; z-index:1;
  display:flex; justify-content:flex-end; gap:8px;
  padding:16px 20px 20px;
}
#btn-modal-cancel {
  display:flex; align-items:center; gap:6px;
  background:transparent; border:1px solid rgba(255,255,255,.1);
  border-radius:8px; color:var(--dim); font-family:var(--mono);
  font-size:12px; padding:8px 16px; cursor:pointer;
  transition:background .1s, color .1s, border-color .1s;
}
#btn-modal-cancel:hover { background:rgba(255,255,255,.06); color:var(--text); border-color:rgba(255,255,255,.18); }
#btn-modal-ok {
  display:flex; align-items:center; gap:7px;
  background:var(--accent); border:none; border-radius:8px;
  color:#fff; font-family:var(--mono); font-size:12px; font-weight:700;
  padding:8px 20px; cursor:pointer;
  box-shadow:0 4px 16px rgba(124,106,255,.35);
  transition:background .1s, opacity .15s, transform .1s, box-shadow .15s;
}
#btn-modal-ok:hover:not(:disabled) { background:var(--accent-d); box-shadow:0 6px 20px rgba(124,106,255,.5); }
#btn-modal-ok:active:not(:disabled) { transform:scale(.97); }
#btn-modal-ok:disabled { opacity:.25; cursor:not-allowed; box-shadow:none; }