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

:root {
  --bg: #111;
  --fg: #e0e0e0;
  --dim: #bbb;
  --accent: #fff;
  --pane-bg: #1a1a1a;
  --border: #444;
  --btn-bg: #252525;
  --btn-hover: #363636;
  --btn-active: #444;
  --danger: #e55;
  --connected: #7d7;
  --font: 'SF Mono', 'Menlo', 'Consolas', monospace;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 13px;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ---- header ---- */

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo {
  font-weight: bold;
  font-size: 15px;
  color: var(--accent);
  letter-spacing: 0.5px;
}

.status-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--dim);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--dim);
  transition: background 0.2s;
}

.status-dot.connected {
  background: var(--connected);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

select {
  background: var(--btn-bg);
  color: var(--fg);
  border: 1px solid var(--border);
  padding: 4px 6px;
  font-family: var(--font);
  font-size: 13px;
  border-radius: 3px;
  max-width: 180px;
}

/* ---- main layout ---- */

main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.pane {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#filePane {
  width: 240px;
  min-width: 200px;
  border-right: 1px solid var(--border);
  flex-shrink: 0;
  background: var(--pane-bg);
}

#replPane {
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* ---- file pane ---- */

.pane-header {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 6px 6px;
  border-bottom: 1px solid var(--border);
}

.file-icon {
  display: flex;
  align-items: center;
  padding: 4px 6px;
  color: var(--dim);
}

.file-icon svg {
  width: 18px;
  height: 18px;
  display: block;
}

.pane-refresh {
  background: none;
  border: none;
  color: var(--dim);
  cursor: pointer;
  padding: 4px 6px;
  display: flex;
  align-items: center;
  border-radius: 3px;
}

.pane-refresh:hover {
  color: var(--accent);
  background: var(--btn-hover);
}

.pane-refresh svg {
  width: 14px;
  height: 14px;
  display: block;
}

.file-list {
  flex: 1;
  overflow-y: auto;
  padding: 2px 0;
}

.file-list-empty {
  padding: 12px 10px;
  color: var(--dim);
  font-size: 13px;
}

/* ---- file row ---- */

.file-row {
  position: relative;
  display: flex;
  align-items: center;
  padding: 0 4px 0 4px;
  min-height: 30px;
  font-size: 13px;
}

.file-row:hover {
  background: var(--btn-hover);
}

.file-play-btn {
  background: none;
  border: none;
  color: var(--dim);
  cursor: pointer;
  font-size: 13px;
  padding: 4px 5px;
  font-family: var(--font);
  border-radius: 3px;
  flex-shrink: 0;
  line-height: 1;
}

.file-play-btn:hover {
  color: var(--accent);
  background: var(--btn-active);
}

.file-label {
  flex: 1;
  padding: 4px 4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--fg);
}

.file-size-label {
  color: var(--dim);
  font-size: 13px;
  flex-shrink: 0;
  padding-right: 2px;
}

.file-menu-btn {
  background: none;
  border: none;
  color: var(--dim);
  cursor: pointer;
  font-size: 18px;
  padding: 4px 6px;
  font-family: var(--font);
  border-radius: 3px;
  flex-shrink: 0;
  line-height: 1;
}

.file-menu-btn:hover {
  color: var(--accent);
  background: var(--btn-active);
}

/* ---- file context menu ---- */

.file-menu {
  display: none;
  position: absolute;
  right: 4px;
  top: 100%;
  z-index: 10;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px 0;
  min-width: 100px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.5);
}

.file-menu.open {
  display: block;
}

.file-menu-item {
  display: block;
  width: 100%;
  background: none;
  border: none;
  color: var(--fg);
  font-family: var(--font);
  font-size: 13px;
  padding: 5px 12px;
  text-align: left;
  cursor: pointer;
}

.file-menu-item:hover {
  background: var(--btn-hover);
}

.file-menu-item.danger {
  color: var(--danger);
}

.file-list-separator {
  height: 1px;
  background: var(--border);
  margin: 4px 8px;
}

.file-space {
  padding: 6px 10px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--dim);
}

/* ---- repl toolbar ---- */

.repl-toolbar {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  border-top: 1px solid var(--border);
}

.toolbar-btn {
  background: var(--btn-bg);
  color: var(--dim);
  border: 1px solid var(--border);
  padding: 4px 10px;
  font-family: var(--font);
  font-size: 13px;
  cursor: pointer;
  border-radius: 3px;
}

.toolbar-btn:hover {
  color: var(--fg);
  background: var(--btn-hover);
}

.toolbar-spacer {
  flex: 1;
}

.arc-key-label {
  color: var(--dim);
  font-family: var(--font);
  font-size: 13px;
  user-select: none;
  margin-right: 4px;
}

.arc-key-btn {
  width: 22px;
  height: 22px;
  min-width: 22px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--btn-bg);
  padding: 0;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  transition: background 0.1s, border-color 0.1s;
}

.arc-key-btn:hover {
  border-color: var(--dim);
}

.arc-key-btn:active,
.arc-key-btn.pressed {
  background: var(--dim);
}

/* ---- repl ---- */

.output-container {
  position: relative;
  flex: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.output {
  flex: 1;
  overflow-y: auto;
  padding: 10px 12px;
  white-space: pre-wrap;
  word-wrap: break-word;
  font-size: 13px;
  line-height: 1.5;
  color: var(--fg);
}

.output-float-btn {
  position: absolute;
  right: 12px;
  top: 12px;
  z-index: 5;
  background: var(--btn-bg);
  color: var(--dim);
  border: 1px solid var(--border);
  padding: 3px 10px;
  font-family: var(--font);
  font-size: 13px;
  cursor: pointer;
  border-radius: 3px;
}

.output-float-btn:hover {
  color: var(--fg);
  background: var(--btn-hover);
}

.output-float-link {
  position: absolute;
  right: 12px;
  top: 40px;
  z-index: 5;
  color: var(--dim);
  font-family: var(--font);
  font-size: 13px;
  text-decoration: underline;
}

.output-float-link:hover {
  color: var(--fg);
}

/* ---- repl input ---- */

.repl-input-container {
  padding: 8px 12px;
  border-top: 1px solid var(--border);
}

.repl-input-row {
  position: relative;
}

.repl-input-prompt {
  position: absolute;
  top: 8px;
  left: 10px;
  color: var(--dim);
  font-family: var(--font);
  font-size: 13px;
  line-height: 1.4;
  user-select: none;
  pointer-events: none;
}

.repl-input {
  width: 100%;
  min-height: 56px;
  max-height: 200px;
  resize: vertical;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--btn-bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 13px;
  line-height: 1.4;
  padding: 8px 10px 8px 32px;
  outline: none;
}

.repl-input:focus {
  border-color: var(--dim);
}

/* ---- modal ---- */

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 16px;
}

.modal-content {
  width: min(500px, 100%);
  background: var(--pane-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  font-family: var(--font);
  font-size: 13px;
}

.modal-content h2 {
  font-size: 14px;
  margin-bottom: 10px;
  color: var(--accent);
}

.modal-content p {
  color: var(--dim);
  margin-bottom: 8px;
}

.modal-btn {
  border: 1px solid var(--border);
  background: var(--btn-bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 13px;
  padding: 5px 14px;
  border-radius: 4px;
  cursor: pointer;
  margin-top: 8px;
}

.modal-btn:hover {
  background: var(--btn-hover);
}