/* Light theme (default) */
:root {
  color-scheme: light;
  --bg: #eef1f5;
  --panel: #f8f9fb;
  --panel2: #ffffff;
  --raised: #ffffff;
  --hover: #eef2f7;
  --input: #ffffff;
  --line: #d6dce4;
  --btn-border: #c9d1db;
  --btn-border-hover: #9aa6b4;
  --fg: #1f2933;
  --muted: #64707d;
  --accent: #f59e0b;
  --accent-fg: #1b1f24;
  --blue: #3b82f6;
  --stage: #cfd6df;
  --danger: #dc2626;
  --danger-fg: #b91c1c;
  --danger-bg: #fde8e8;
  --shadow: #0003;
}
/* Dark theme */
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #1b1f24;
  --panel: #22272e;
  --panel2: #2a3038;
  --raised: #333a44;
  --hover: #3d4551;
  --input: #1a1e23;
  --line: #3b434e;
  --btn-border: #4a525e;
  --btn-border-hover: #5a6370;
  --fg: #e6e9ee;
  --muted: #9aa4b1;
  --stage: #2b3139;
  --danger: #ef4444;
  --danger-fg: #fca5a5;
  --danger-bg: #4a2a2a;
  --shadow: #0009;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; overscroll-behavior: none; }
body {
  height: 100dvh;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) 0 env(safe-area-inset-left);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--fg);
  font: 13px/1.35 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  overflow: hidden;
}
.muted { color: var(--muted); }
.spacer { flex: 1; }
[hidden] { display: none !important; }

/* ---------- buttons & inputs ---------- */
.btn, .cmd {
  background: var(--raised);
  color: var(--fg);
  border: 1px solid var(--btn-border);
  border-radius: 6px;
  padding: 5px 10px;
  font: inherit;
  cursor: pointer;
  white-space: nowrap;
}
.btn:hover, .cmd:hover { background: var(--hover); border-color: var(--btn-border-hover); }
.btn:active, .cmd:active { transform: translateY(1px); }
.btn.primary, .cmd.primary { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); font-weight: 600; }
.btn.primary:hover, .cmd.primary:hover { background: #fbbf24; }
.btn.danger { color: var(--danger-fg); }
.btn.danger:hover { background: var(--danger-bg); border-color: var(--danger); }
.btn.icon { padding: 5px 9px; }
.btn.small, .cmd.small { padding: 2px 8px; }
.btn:disabled, .cmd:disabled { opacity: .45; cursor: default; }
select.btn { padding-right: 6px; }

input[type=text], input[type=number], select {
  background: var(--input);
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 4px 6px;
  font: inherit;
  width: 100%;
  min-width: 0;
}
input:focus, select:focus { outline: 2px solid #f59e0b66; border-color: var(--accent); }
input[type=color] {
  width: 44px; height: 26px; padding: 1px 2px;
  background: var(--input); border: 1px solid var(--line); border-radius: 5px; cursor: pointer;
}
input[type=checkbox] { accent-color: var(--accent); }
.chk { display: inline-flex; align-items: center; gap: 4px; color: var(--muted); cursor: pointer; user-select: none; }

/* ---------- top bar ---------- */
#topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 10px;
  background: var(--panel2);
  border-bottom: 1px solid var(--line);
}
.brand { font-weight: 700; font-size: 15px; white-space: nowrap; }
.brand .logo { color: var(--accent); }
.group { display: flex; align-items: center; gap: 6px; }
.proj-name { max-width: 220px; font-weight: 600; background: transparent !important; border-color: transparent !important; }
.proj-name:hover { border-color: var(--line) !important; }
.proj-name:focus { background: var(--input) !important; border-color: var(--accent) !important; }

/* ---------- main layout ---------- */
#main { flex: 1; display: flex; min-height: 0; }
#left {
  width: 280px;
  flex: none;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--line);
  background: var(--panel);
  min-height: 0;
}
.panel { overflow: auto; padding: 0 10px 12px; }
.panel h2 {
  position: sticky; top: 0; z-index: 1;
  margin: 0 -10px 8px; padding: 9px 10px 7px;
  font-size: 12px; letter-spacing: .06em; text-transform: uppercase;
  background: var(--panel); border-bottom: 1px solid var(--line);
}
.panel h2 .hint { text-transform: none; letter-spacing: 0; font-weight: 400; color: var(--muted); margin-left: 6px; }
#toolkit { flex: 1 1 48%; min-height: 140px; }
#props { flex: 1 1 52%; min-height: 160px; border-top: 2px solid var(--line); }

/* ---------- toolkit ---------- */
.tool-cat { margin: 10px 0 6px; font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; }
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(52px, 1fr)); gap: 5px; }
.tool {
  background: var(--panel2);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 3px 1px;
  text-align: center;
  cursor: grab;
  user-select: none;
  transition: border-color .12s, background .12s;
}
.tool:hover { border-color: var(--accent); background: var(--hover); }
.tool:active { cursor: grabbing; }
.tool canvas { display: block; width: 48px; height: 34px; margin: 0 auto; pointer-events: none; }

/* ---------- properties ---------- */
.prop-head { display: flex; align-items: center; gap: 8px; margin-bottom: 4px; }
.prop-head canvas { width: 48px; height: 32px; background: var(--panel2); border-radius: 6px; flex: none; }
.prop-head .name { font-weight: 700; font-size: 14px; }
.prop-desc { color: var(--muted); font-size: 12px; margin: 0 0 8px; }
.prow { display: grid; grid-template-columns: 112px 1fr; align-items: center; gap: 6px; margin: 4px 0; }
.prow label { color: var(--muted); font-size: 12px; }
.prow .hint { grid-column: 2; color: var(--muted); font-size: 11px; margin-top: -2px; }
.prop-actions { display: flex; flex-wrap: wrap; gap: 6px; margin: 10px 0 4px; }
.prop-sep { border: 0; border-top: 1px solid var(--line); margin: 10px 0; }
.prop-note { color: var(--muted); font-size: 11.5px; margin: 6px 0; }

/* ---------- center ---------- */
#center { flex: 1; display: flex; flex-direction: column; min-width: 0; }
#tabbar {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  padding: 6px 8px 0;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}
#tabs { display: flex; gap: 3px; overflow-x: auto; min-width: 0; }
.tab {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 8px 6px 12px;
  background: var(--panel2);
  border: 1px solid var(--line); border-bottom: none;
  border-radius: 7px 7px 0 0;
  color: var(--muted);
  cursor: pointer; white-space: nowrap; user-select: none;
}
.tab:hover { color: var(--fg); }
.tab.active { background: var(--stage); color: var(--fg); box-shadow: inset 0 2px 0 var(--accent); }
.tab .x { border: 0; background: transparent; color: var(--muted); cursor: pointer; padding: 0 3px; border-radius: 4px; font-size: 14px; line-height: 1; }
.tab .x:hover { background: var(--hover); color: var(--fg); }
.tab input { width: 120px; padding: 1px 4px; }
.tab-add { border: 1px dashed var(--btn-border); background: transparent; color: var(--muted); border-radius: 7px 7px 0 0; padding: 5px 10px; cursor: pointer; font-size: 15px; line-height: 1; margin-bottom: -1px; }
.tab-add:hover { color: var(--fg); border-color: var(--accent); }
.menu-wrap { position: relative; padding-bottom: 5px; }
.menu {
  position: absolute; right: 0; top: calc(100% + 2px); z-index: 20;
  min-width: 280px; max-height: 60vh; overflow: auto;
  background: var(--panel2); border: 1px solid var(--line); border-radius: 8px;
  box-shadow: 0 10px 30px var(--shadow); padding: 6px;
}
.menu .mtitle { font-size: 11px; text-transform: uppercase; color: var(--muted); padding: 4px 6px; letter-spacing: .05em; }
.lrow { display: flex; align-items: center; gap: 4px; padding: 3px 4px; border-radius: 5px; }
.lrow:hover { background: var(--raised); }
.lrow .lname { flex: 1; cursor: pointer; padding: 3px 2px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lrow.closed .lname { color: var(--muted); font-style: italic; }
.lrow.active .lname { color: var(--accent); font-weight: 600; }
.lrow .count { color: var(--muted); font-size: 11px; min-width: 22px; text-align: right; }
.lrow button { border: 0; background: transparent; color: var(--muted); cursor: pointer; padding: 2px 5px; border-radius: 4px; }
.lrow button:hover { background: var(--hover); color: var(--fg); }
.menu hr { border: 0; border-top: 1px solid var(--line); margin: 6px 0; }
.menu .btn { width: 100%; }

#stage { flex: 1; position: relative; min-height: 0; overflow: hidden; background: var(--stage); }
#canvas { position: absolute; left: 0; top: 0; width: 100%; height: 100%; display: block; touch-action: none; }
#stage.drop-target { outline: 3px dashed var(--accent); outline-offset: -6px; }
#emptyState {
  position: absolute; inset: 0; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 4px; text-align: center;
}
#emptyState p { margin: 2px; font-size: 15px; }
#toast {
  position: absolute; left: 50%; bottom: 14px; transform: translateX(-50%);
  background: #111a; backdrop-filter: blur(4px); color: #fff;
  padding: 7px 14px; border-radius: 20px; font-size: 13px; pointer-events: none;
}

/* ---------- command bar ---------- */
#commandbar {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 12px;
  background: var(--panel2); border-bottom: 1px solid var(--line);
}
.cmd { padding: 7px 14px; font-size: 14px; }
.cmd.primary { min-width: 96px; }
.speed { display: inline-flex; align-items: center; gap: 4px; margin-left: 8px; }
.speed .cmd.small { padding: 4px 10px; font-size: 15px; }
#speedVal { min-width: 46px; text-align: center; font-variant-numeric: tabular-nums; font-weight: 600; }
.readout { font-variant-numeric: tabular-nums; margin-left: 8px; white-space: nowrap; }

/* ---------- help dialog ---------- */
dialog {
  background: var(--panel2); color: var(--fg);
  border: 1px solid var(--line); border-radius: 12px;
  max-width: 560px; padding: 18px 22px;
  box-shadow: 0 20px 60px var(--shadow);
}
dialog::backdrop { background: #0008; }
dialog h2 { margin: 0 0 6px; }
dialog h3 { margin: 14px 0 4px; font-size: 13px; color: var(--accent); }
dialog ul { margin: 4px 0; padding-left: 18px; }
dialog .keys { columns: 2; }
dialog form { text-align: right; margin-top: 14px; }
kbd {
  background: var(--input); border: 1px solid var(--line); border-bottom-width: 2px;
  border-radius: 4px; padding: 0 4px; font: 11px ui-monospace, monospace;
}

/* ---------- version, menu toggle, panel switch (hidden on desktop) ---------- */
.version { font-size: 11px; font-weight: 500; color: var(--muted); margin-left: 4px; }
.menu-toggle { display: none; }
#panelSwitch { display: none; }
#topbar { position: relative; z-index: 15; }

/* ---------- pull to refresh ---------- */
#ptr {
  position: fixed; top: 0; left: 50%; z-index: 100;
  display: flex; align-items: center; gap: 8px;
  padding: 7px 14px; border-radius: 20px;
  background: var(--panel2); color: var(--fg);
  border: 1px solid var(--line); box-shadow: 0 6px 20px var(--shadow);
  transform: translate(-50%, -60px); opacity: 0;
  pointer-events: none; font-size: 13px;
}
#ptr.anim { transition: transform .2s, opacity .2s; }
#ptr .ptr-icon { display: inline-block; font-size: 18px; color: var(--accent); }
#ptr.ready .ptr-icon { transform: rotate(180deg); }
#ptr.refreshing .ptr-icon { animation: ptr-spin .7s linear infinite; }
@keyframes ptr-spin { to { transform: rotate(360deg); } }

/* ---------- compact layouts: phones (portrait or landscape) ---------- */
@media (max-width: 700px), (max-height: 520px) {
  #topbar { gap: 6px; padding: 4px 8px; }
  .brand { font-size: 14px; }
  .brand-sub, .panel h2 .hint { display: none; }
  .proj-name { max-width: 130px; }
  .menu-toggle { display: inline-flex; }
  .top-menu {
    display: none;
    position: absolute; top: 100%; left: 6px; right: 6px;
    flex-wrap: wrap; gap: 8px; padding: 10px;
    background: var(--panel2); border: 1px solid var(--line); border-radius: 10px;
    box-shadow: 0 10px 30px var(--shadow);
  }
  #topbar.menu-open .top-menu { display: flex; }
  .btn, .cmd { min-height: 34px; }
  input[type=text], input[type=number], select { font-size: 16px; } /* stops iOS zooming on focus */

  #panelSwitch {
    display: flex; gap: 4px; padding: 6px 8px 0;
    border-bottom: 1px solid var(--line); background: var(--panel);
  }
  .ps-btn {
    flex: 1; padding: 7px 8px; font: inherit; font-weight: 600; cursor: pointer;
    background: transparent; color: var(--muted);
    border: 1px solid transparent; border-bottom: none; border-radius: 7px 7px 0 0;
  }
  .ps-btn.active { background: var(--panel2); color: var(--fg); border-color: var(--line); box-shadow: inset 0 2px 0 var(--accent); }
  #toolkit, #props { flex: 1 1 auto; min-height: 0; border-top: none; }
  #left:not(.show-props) #props { display: none; }
  #left.show-props #toolkit { display: none; }
  .panel h2 { display: none; }
  .panel { padding-top: 6px; }
  .tool-grid { grid-template-columns: repeat(auto-fill, minmax(52px, 1fr)); }

  #tabbar { padding: 4px 6px 0; }
  .tab { padding: 5px 6px 5px 10px; }
  #commandbar { gap: 6px; padding: 6px 8px; flex-wrap: nowrap; overflow-x: auto; }
  .cmd { padding: 5px 10px; font-size: 15px; }
  .cmd .lbl, #statusVal, #cursorVal { display: none; }
  .cmd.primary { min-width: 78px; }
  .speed { margin-left: 2px; }
  .readout { margin-left: 2px; font-size: 12px; }
  dialog { max-height: 88dvh; overflow: auto; padding: 14px 16px; }
  dialog .keys { columns: 1; }
}

/* phone portrait: work area on top, tool/properties drawer below */
@media (max-width: 700px) and (min-height: 521px) {
  #main { flex-direction: column; }
  #center { flex: 1 1 58%; min-height: 0; }
  #left {
    order: 2; width: auto; flex: 0 0 42%;
    border-right: none; border-top: 2px solid var(--line);
  }
}

/* phone landscape: narrow side column */
@media (max-height: 520px) {
  #left { width: 210px; }
  .tool-grid { grid-template-columns: repeat(3, 1fr); }
  .prow { grid-template-columns: 82px 1fr; }
  #commandbar { padding: 4px 8px; }
}

.tool-ghost {
  position: fixed; z-index: 200; width: 72px; height: 48px;
  transform: translate(-50%, -50%); pointer-events: none; opacity: .85;
  background: var(--panel2); border: 1px solid var(--accent); border-radius: 8px;
}

@media (max-width: 700px), (max-height: 520px) {
  .proj-name { flex: 1 1 60px; min-width: 50px; }
  #topbar .btn.icon, #topbar #btnFit { padding: 4px 8px; }
  #commandbar { scrollbar-width: none; }
  #commandbar::-webkit-scrollbar { display: none; }
  .frame-part { display: none; }
}
/* phones while a run is in progress: the work area gets the whole screen (pause brings the panels back) */
@media (max-width: 700px), (max-height: 520px) {
  body.running #left, body.running #topbar, body.running #tabbar { display: none; }
}
@media (max-width: 480px) {
  .brand-name { display: none; }
  #topbar { gap: 4px; }
  #topbar .group { gap: 4px; }
}

/* challenge mode */
#btnChallenge.on { background: #16a34a; color: #fff; border-color: #16a34a; }
.chal-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin: 8px 0 2px; font-size: 12px; }
.chal-bar .chal-label { color: var(--muted); }
.chal-bar .btn.active { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }
.chal-bar.on { color: #15803d; font-weight: 600; }
.chal-hint { flex-basis: 100%; font-size: 11px; }
.tool { position: relative; }
.tool .pick {
  position: absolute; top: 2px; right: 2px; width: 14px; height: 14px;
  border: 1px solid var(--btn-border); border-radius: 3px; background: var(--input);
  font-size: 10px; line-height: 12px; text-align: center; color: #fff; cursor: pointer;
}
.tool .pick.on { background: #16a34a; border-color: #16a34a; }
.tool .pick.badge { pointer-events: none; }
.lock-note { color: #b45309; }

/* challenge complete banner */
#winBanner {
  position: absolute; left: 50%; top: 18px; transform: translateX(-50%); z-index: 5;
  background: var(--panel2); border: 2px solid #16a34a; border-radius: 12px;
  box-shadow: 0 10px 30px var(--shadow); padding: 12px 18px; text-align: center; max-width: 92%;
}
.win-title { font-size: 20px; font-weight: 800; color: #15803d; }
.win-sub { color: var(--muted); margin: 2px 0 8px; }
.win-actions { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; }

/* challenges window */
#chalDlg { max-width: 860px; width: 94vw; }
.cd-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.cd-head select { width: auto; max-width: 260px; }
.cd-head h2 { margin: 0; }
.cd-count { font-weight: 700; color: #15803d; }
.cd-progress { height: 8px; background: var(--line); border-radius: 4px; margin: 8px 0; overflow: hidden; }
#cdBar { height: 100%; background: #16a34a; width: 0; transition: width .3s; }
.cd-filters { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
.cd-filters .btn.active { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }
.cd-body { display: grid; grid-template-columns: 1fr 260px; gap: 12px; }
.cd-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(52px, 1fr)); gap: 5px; max-height: 52vh; overflow: auto; align-content: start; }
.cd-tile {
  position: relative; height: 46px; border-radius: 8px; cursor: pointer; font: inherit;
  border: 2px solid transparent; color: #1f2933; display: flex; flex-direction: column; align-items: center; justify-content: center;
}
.cd-tile.easy { background: #dcfce7; }
.cd-tile.medium { background: #fef9c3; }
.cd-tile.hard { background: #fee2e2; }
.cd-tile.very-hard { background: #e9d5ff; }
.cd-tile.picked { border-color: var(--accent); }
.cd-tile .n { font-weight: 700; font-size: 13px; line-height: 1; }
.cd-tile .e { font-size: 14px; line-height: 1.2; }
.cd-tile .lv { position: absolute; left: 3px; top: 2px; font-size: 9px; font-weight: 700; color: #6d28d9; }
.cd-tile .ok { position: absolute; right: 3px; top: 1px; font-size: 12px; font-weight: 800; color: #15803d; }
.cd-tile.done { box-shadow: inset 0 0 0 2px #16a34a; }
.cd-detail { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 10px; }
.cd-name { font-weight: 800; font-size: 15px; }
.cd-solved { color: #15803d; font-weight: 600; }
.cd-foot { margin: 10px 0 0; font-size: 12px; }
@media (max-width: 700px) { .cd-body { grid-template-columns: 1fr; } .cd-grid { max-height: 38vh; } }

/* pinball: flipper buttons + score */
#flipBtns { display: inline-flex; gap: 6px; }
#flipBtns:empty { display: none; }
.cmd.flip { min-width: 46px; font-weight: 700; touch-action: none; user-select: none; -webkit-user-select: none; }
.cmd.flip.on { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }
.readout.score { font-weight: 700; color: #7c3aed; }
.key-input { cursor: pointer; text-align: center; font-weight: 600; }