:root {
  --bg: #1e1f29;
  --bg-elev: #282a36;
  --bg-elev-2: #21222c;
  --border: #343746;
  --fg: #f8f8f2;
  --fg-dim: #a9adc1;
  --accent: #50fa7b;
  --accent-2: #8be9fd;
  --danger: #ff5555;
  --warn: #f1fa8c;
  --tab-active-bg: #282a36;
  --tab-inactive-bg: #1e1f29;
  --shadow: 0 1px 0 rgba(0,0,0,.3), 0 10px 30px rgba(0,0,0,.25);
  --radius: 6px;
  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "Cascadia Code", Menlo, Consolas, "Liberation Mono", monospace;
}

body[data-theme-mode="light"] {
  --bg: #f5f6f8;
  --bg-elev: #ffffff;
  --bg-elev-2: #eef0f4;
  --border: #d9dde3;
  --fg: #1c1e21;
  --fg-dim: #5b6270;
  --accent: #1f883d;
  --accent-2: #0969da;
  --tab-active-bg: #ffffff;
  --tab-inactive-bg: #eef0f4;
  --shadow: 0 1px 0 rgba(0,0,0,.06), 0 6px 20px rgba(0,0,0,.06);
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-ui);
  font-size: 13px;
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  overflow: hidden;
}

button, select, input[type="number"] {
  font-family: inherit;
  font-size: 12px;
  color: var(--fg);
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 5px 10px;
  cursor: pointer;
  transition: background .12s ease, border-color .12s ease, transform .06s ease;
}
button:hover, select:hover { background: var(--bg-elev); border-color: var(--accent); }
button:active { transform: translateY(1px); }
select { padding-right: 22px; }
input[type="number"] { width: 56px; text-align: center; cursor: text; }

.topbar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 8px 12px;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
  z-index: 2;
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; }
.brand-mark {
  font-family: var(--font-mono);
  color: var(--accent);
  background: var(--bg-elev-2);
  padding: 3px 8px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.brand-name { letter-spacing: .5px; }
.toolbar, .toolbar-right { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.toolbar-right { margin-left: auto; }
.sep { width: 1px; height: 22px; background: var(--border); }

.field {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--fg-dim);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .6px;
}
.toggle {
  display: flex; align-items: center; gap: 6px;
  color: var(--fg-dim);
  cursor: pointer;
  user-select: none;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .6px;
}
.toggle input { accent-color: var(--accent); }

/* Tab bar */
.tabbar {
  display: flex;
  align-items: stretch;
  gap: 1px;
  background: var(--bg-elev-2);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: thin;
  min-height: 36px;
}
.tabbar::-webkit-scrollbar { height: 6px; }
.tabbar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

.tab {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px 8px 14px;
  background: var(--tab-inactive-bg);
  color: var(--fg-dim);
  border-right: 1px solid var(--border);
  cursor: pointer;
  max-width: 260px;
  min-width: 120px;
  user-select: none;
  position: relative;
  font-size: 12px;
  white-space: nowrap;
}
.tab:hover { color: var(--fg); background: color-mix(in srgb, var(--tab-active-bg) 60%, transparent); }
.tab.active {
  background: var(--tab-active-bg);
  color: var(--fg);
}
.tab.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 0;
  height: 2px;
  background: var(--accent);
}
.tab .name {
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
}
.tab .name[contenteditable="true"] {
  outline: 1px solid var(--accent);
  border-radius: 3px;
  padding: 0 2px;
  background: var(--bg);
}
.tab .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--warn);
  opacity: 0;
}
.tab.dirty .dot { opacity: 1; }
.tab .close {
  border: none;
  background: transparent;
  color: var(--fg-dim);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 14px;
  line-height: 1;
}
.tab .close:hover { background: var(--danger); color: #fff; }
.tab.dirty .close { color: var(--warn); }

/* Editor area */
.editor-wrap {
  position: relative;
  overflow: hidden;
  background: var(--bg);
  min-height: 0;
}
#editor {
  position: absolute;
  inset: 0;
}
.CodeMirror {
  height: 100% !important;
  width: 100%;
}
.CodeMirror {
  font-family: var(--font-mono);
  font-feature-settings: "liga" 1, "calt" 1;
}
.CodeMirror-gutters { border-right: 1px solid var(--border); }

.empty-state {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  color: var(--fg-dim);
  text-align: center;
  pointer-events: none;
  background: var(--bg);
}
.empty-state[hidden] { display: none !important; }
.empty-state h2 { margin: 0 0 6px; color: var(--fg); font-weight: 600; }
.empty-state kbd {
  font-family: var(--font-mono);
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 11px;
  color: var(--fg);
}

/* Status bar */
.statusbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 5px 12px;
  background: var(--bg-elev);
  border-top: 1px solid var(--border);
  color: var(--fg-dim);
  font-size: 11px;
  font-family: var(--font-mono);
}
.statusbar .sep { height: 14px; }
.statusbar .grow { flex: 1; }
#status-saved.dirty { color: var(--warn); }
#status-saved.saved { color: var(--accent); }

/* Drop overlay */
#drop-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.55);
  border: 3px dashed var(--accent);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000;
  color: var(--fg);
  font-size: 20px;
  pointer-events: none;
}
#drop-overlay[hidden] { display: none !important; }

/* CodeMirror tweaks */
.CodeMirror-linenumber { color: var(--fg-dim); opacity: .7; }
.CodeMirror-foldmarker { color: var(--accent); }
.cm-trailingspace {
  background: rgba(255, 85, 85, .18);
}

/* Scrollbars (editor) */
.CodeMirror-scrollbar-filler { background: transparent; }

/* --- Responsive: tablet (<=768px) ------------------------------------- */
@media (max-width: 768px) {
  body { font-size: 13px; }

  .topbar {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    padding: 8px;
    overflow-x: auto;
    max-height: 46vh;
    overflow-y: auto;
  }
  .brand { justify-content: flex-start; }
  .toolbar, .toolbar-right {
    flex-wrap: wrap;
    gap: 6px;
    margin-left: 0;
  }
  .topbar button,
  .topbar select,
  .topbar input[type="number"] {
    min-height: 44px;
    font-size: 13px;
    padding: 8px 12px;
  }
  .field, .toggle { font-size: 11px; }
  .toggle { min-height: 44px; padding: 0 6px; }
  .sep { display: none; }

  .tab {
    min-width: 100px;
    max-width: 180px;
    padding: 10px 8px 10px 12px;
    font-size: 12px;
  }
  .tab .close { min-width: 32px; min-height: 32px; font-size: 16px; }
  .tabbar { min-height: 46px; }

  .CodeMirror { font-size: 13px !important; }

  .statusbar {
    font-size: 10px;
    gap: 6px;
    padding: 4px 8px;
  }
  .statusbar .sep { display: inline-block; }
}

/* --- Responsive: phone (<=480px) -------------------------------------- */
@media (max-width: 480px) {
  .topbar { padding: 6px; max-height: 40vh; }
  .brand-name { display: none; }
  .topbar button {
    padding: 10px 10px;
    font-size: 12px;
  }
  .field span { display: none; }
  .field select { min-width: 110px; }
  .toolbar-right { width: 100%; justify-content: space-between; }

  .tab { min-width: 90px; max-width: 140px; font-size: 11px; }

  .CodeMirror { font-size: 12px !important; }
  .CodeMirror-linenumber { font-size: 10px; }

  .statusbar { font-size: 10px; padding: 3px 6px; }
  #status-sel, #status-size { display: none; }

  .empty-state h2 { font-size: 15px; }
  .empty-state p { font-size: 11px; }
}