/* Tilebrush — Photoshop-inspired dark workspace UI */
:root {
  --bg-workspace: #17181b;
  --bg-panel: #26282c;
  --bg-panel-2: #2e3136;
  --bg-header: #1e2023;
  --bg-input: #1b1d20;
  --border: #3a3d43;
  --border-soft: #303338;
  --text: #d9dbdf;
  --text-muted: #9a9ea6;
  --text-dim: #6f737b;
  --accent: #58a6ff;
  --accent-soft: rgba(88, 166, 255, .16);
  --danger: #e2725b;
  --radius: 6px;
  --toolrail-w: 48px;
  --dock-w: 264px;
  --appbar-h: 46px;
  --optbar-h: 42px;
  --status-h: 26px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; }
body {
  font: 13px/1.45 -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-workspace);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
input, select { font: inherit; }

/* ---------- App frame ---------- */
#app {
  display: grid;
  grid-template-rows: var(--appbar-h) var(--optbar-h) 1fr var(--status-h);
  height: 100vh;
  height: 100dvh;
  min-height: 480px;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
}

/* ---------- App bar ---------- */
#appbar {
  display: flex; align-items: center; gap: 10px;
  background: var(--bg-header);
  border-bottom: 1px solid var(--border-soft);
  padding: 0 12px;
}
#logo { display: flex; align-items: center; gap: 8px; font-weight: 600; font-size: 14px; letter-spacing: .2px; }
#logo svg { display: block; }
#logo .beta { font-size: 10px; color: var(--accent); border: 1px solid var(--accent); border-radius: 3px; padding: 0 4px; font-weight: 500; }
#appbar .spacer { flex: 1; }
.iconbtn {
  width: 30px; height: 30px; border-radius: var(--radius);
  display: inline-flex; align-items: center; justify-content: center;
  color: var(--text-muted);
}
.iconbtn:hover { background: var(--bg-panel-2); color: var(--text); }
.iconbtn:disabled { opacity: .35; cursor: default; }
.iconbtn:disabled:hover { background: none; color: var(--text-muted); }
.primarybtn {
  background: var(--accent); color: #0c1015; font-weight: 600;
  border-radius: var(--radius); padding: 6px 14px;
}
.primarybtn:hover { filter: brightness(1.1); }

/* ---------- Options bar ---------- */
#optionsbar {
  display: flex; align-items: center; gap: 14px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border-soft);
  padding: 0 12px;
  overflow-x: auto;
  scrollbar-width: none;
}
#optionsbar::-webkit-scrollbar { display: none; }
.opt { display: flex; align-items: center; gap: 7px; white-space: nowrap; }
.opt label { color: var(--text-muted); font-size: 12px; }
.opt output { min-width: 30px; text-align: right; font-size: 12px; color: var(--text); font-variant-numeric: tabular-nums; }
input[type="range"] {
  -webkit-appearance: none; appearance: none;
  width: 110px; height: 3px; border-radius: 2px;
  background: var(--border);
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 13px; height: 13px; border-radius: 50%;
  background: var(--text); cursor: pointer;
}
input[type="range"]::-moz-range-thumb {
  width: 13px; height: 13px; border-radius: 50%; border: 0;
  background: var(--text); cursor: pointer;
}
.toggle { display: inline-flex; align-items: center; gap: 6px; color: var(--text-muted); font-size: 12px; cursor: pointer; }
.toggle input { accent-color: var(--accent); }
.divider { width: 1px; height: 20px; background: var(--border-soft); flex: none; }
.segmented { display: inline-flex; background: var(--bg-input); border: 1px solid var(--border-soft); border-radius: var(--radius); overflow: hidden; }
.segmented button { padding: 4px 10px; font-size: 12px; color: var(--text-muted); }
.segmented button.active { background: var(--accent-soft); color: var(--accent); }

/* ---------- Main region ---------- */
#main { display: flex; min-height: 0; position: relative; }

/* Tool rail */
#toolrail {
  width: var(--toolrail-w); flex: none;
  background: var(--bg-panel);
  border-right: 1px solid var(--border-soft);
  display: flex; flex-direction: column; align-items: center;
  padding: 8px 0; gap: 4px;
}
.tool {
  width: 36px; height: 36px; border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted); position: relative;
}
.tool:hover { background: var(--bg-panel-2); color: var(--text); }
.tool.active { background: var(--accent-soft); color: var(--accent); }
.tool .kbd {
  position: absolute; right: 2px; bottom: 1px;
  font-size: 8px; color: var(--text-dim);
}
#toolrail .rail-spacer { flex: 1; }

/* Canvas */
#canvas-wrap { flex: 1; position: relative; min-width: 0; background: var(--bg-workspace); }
#view { position: absolute; inset: 0; width: 100%; height: 100%; touch-action: none; cursor: none; display: block; }
#view.tool-hand { cursor: grab; }
#view.tool-hand.panning { cursor: grabbing; }
#view.tool-zoom { cursor: zoom-in; }
#view.tool-zoom.zoom-out { cursor: zoom-out; }
#view.tool-fill { cursor: crosshair; }
#view.placing { cursor: move; }
#canvas-wrap.drop-hover { outline: 2px dashed var(--accent); outline-offset: -4px; }

/* Place-mode floating bar */
#place-bar {
  position: absolute; top: 12px; left: 50%; transform: translateX(-50%);
  display: flex; align-items: center; gap: 10px;
  background: var(--bg-panel); border: 1px solid var(--border);
  border-radius: 8px; padding: 8px 12px; z-index: 15;
  box-shadow: 0 6px 20px rgba(0,0,0,.35);
  max-width: calc(100% - 24px);
}
#place-bar[hidden] { display: none; }
#place-bar span { font-size: 12px; color: var(--text-muted); white-space: nowrap; }
#place-bar { flex-wrap: wrap; justify-content: center; }
#place-bar input[type="range"] { width: 100px; }
#place-bar output { font-size: 12px; min-width: 38px; text-align: right; font-variant-numeric: tabular-nums; }
#place-bar .ghostbtn { width: auto; margin: 0; padding: 5px 10px; }
#place-bar .primarybtn { padding: 5px 12px; }

/* Touch devices: bigger targets (44px guideline), no long-press callout */
@media (pointer: coarse) {
  :root { --toolrail-w: 56px; }
  .tool { width: 44px; height: 44px; }
  .iconbtn { width: 38px; height: 38px; }
  input[type="range"]::-webkit-slider-thumb { width: 18px; height: 18px; }
  .swatch { min-width: 24px; }
  .panel > h3 { padding: 12px; }
}
#app, #view { -webkit-touch-callout: none; }
#intro-hint {
  position: absolute; left: 50%; top: 46%; transform: translate(-50%, -50%);
  text-align: center; color: var(--text-dim); pointer-events: none;
  transition: opacity .5s; font-size: 14px;
}
#intro-hint strong { color: var(--text-muted); font-weight: 600; }
#intro-hint.hidden { opacity: 0; }

/* Right dock */
#dock {
  width: var(--dock-w); flex: none;
  background: var(--bg-panel);
  border-left: 1px solid var(--border-soft);
  overflow-y: auto;
  scrollbar-width: thin; scrollbar-color: var(--border) transparent;
}
.panel { border-bottom: 1px solid var(--border-soft); }
.panel > h3 {
  font-size: 11px; font-weight: 600; letter-spacing: .8px; text-transform: uppercase;
  color: var(--text-muted);
  padding: 9px 12px 7px;
  display: flex; align-items: center; justify-content: space-between;
  cursor: pointer;
}
.panel > h3::after { content: "▾"; color: var(--text-dim); font-size: 10px; }
.panel.collapsed > h3::after { content: "▸"; }
.panel.collapsed .panel-body { display: none; }
.panel-body { padding: 2px 12px 12px; }

/* Color panel */
#sv-box { width: 100%; height: 120px; border-radius: var(--radius); cursor: crosshair; display: block; border: 1px solid var(--border-soft); }
#hue-strip { width: 100%; height: 14px; border-radius: 7px; cursor: crosshair; display: block; margin-top: 8px; }
.color-row { display: flex; align-items: center; gap: 8px; margin-top: 8px; }
#current-color { width: 30px; height: 30px; border-radius: var(--radius); border: 1px solid var(--border); flex: none; }
#hex-input {
  width: 84px; background: var(--bg-input); border: 1px solid var(--border-soft);
  color: var(--text); border-radius: var(--radius); padding: 5px 8px; font-size: 12px;
  font-family: ui-monospace, Consolas, monospace;
}
#hex-input:focus { outline: 1px solid var(--accent); }
#swatches { display: grid; grid-template-columns: repeat(8, 1fr); gap: 5px; margin-top: 10px; }
.swatch { aspect-ratio: 1; border-radius: 4px; border: 1px solid var(--border-soft); cursor: pointer; padding: 0; }
.swatch:hover { outline: 1px solid var(--text-muted); }

/* Brushes panel */
#brush-list { display: grid; grid-template-columns: 1fr 1fr; gap: 7px; }
.brush-card {
  background: var(--bg-input); border: 1px solid var(--border-soft); border-radius: var(--radius);
  padding: 7px 8px 6px; text-align: left; display: block;
}
.brush-card:hover { border-color: var(--border); }
.brush-card.active { border-color: var(--accent); background: var(--accent-soft); }
.brush-card canvas { width: 100%; height: 26px; display: block; border-radius: 3px; }
.brush-card span { font-size: 11px; color: var(--text-muted); display: block; margin-top: 4px; }
.brush-card.active span { color: var(--accent); }

/* Repeat panel */
.mode-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 7px; }
.mode-card {
  background: var(--bg-input); border: 1px solid var(--border-soft); border-radius: var(--radius);
  padding: 7px 4px 5px; text-align: center;
}
.mode-card:hover { border-color: var(--border); }
.mode-card.active { border-color: var(--accent); background: var(--accent-soft); }
.mode-card svg { display: block; margin: 0 auto; }
.mode-card span { font-size: 10px; color: var(--text-muted); display: block; margin-top: 3px; }
.mode-card.active span { color: var(--accent); }
.field-row { display: flex; align-items: center; justify-content: space-between; margin-top: 10px; gap: 8px; }
.field-row label { color: var(--text-muted); font-size: 12px; }
.field-row select {
  background: var(--bg-input); color: var(--text);
  border: 1px solid var(--border-soft); border-radius: var(--radius);
  padding: 4px 6px; font-size: 12px;
}
.field-row input[type="color"] {
  width: 34px; height: 24px; border: 1px solid var(--border-soft); border-radius: 4px;
  background: var(--bg-input); padding: 1px; cursor: pointer;
}
.ghostbtn {
  width: 100%; margin-top: 10px;
  border: 1px solid var(--border-soft); border-radius: var(--radius);
  padding: 6px 0; color: var(--text-muted); font-size: 12px;
}
.ghostbtn:hover { border-color: var(--danger); color: var(--danger); }

/* Export panel */
.exportbtn {
  width: 100%; display: flex; align-items: center; gap: 8px;
  border: 1px solid var(--border-soft); border-radius: var(--radius);
  padding: 8px 10px; margin-top: 7px; color: var(--text); font-size: 12.5px;
}
.exportbtn:hover { border-color: var(--accent); color: var(--accent); }
.exportbtn small { color: var(--text-dim); margin-left: auto; font-size: 11px; }

/* Status bar */
#statusbar {
  display: flex; align-items: center; gap: 16px;
  background: var(--bg-header);
  border-top: 1px solid var(--border-soft);
  padding: 0 12px;
  font-size: 11.5px; color: var(--text-dim);
  font-variant-numeric: tabular-nums;
  overflow: hidden; white-space: nowrap;
}
#statusbar .grow { flex: 1; }
#statusbar kbd {
  background: var(--bg-panel-2); border: 1px solid var(--border-soft); border-radius: 3px;
  padding: 0 4px; font-size: 10px; font-family: inherit;
}

/* Mobile dock toggle */
#dock-toggle { display: none; }

@media (max-width: 860px) {
  :root { --dock-w: 248px; }
  #dock {
    position: absolute; right: 0; top: 0; bottom: 0; z-index: 20;
    transform: translateX(100%); transition: transform .2s ease;
    box-shadow: -8px 0 24px rgba(0,0,0,.4);
  }
  #dock.open { transform: translateX(0); }
  #dock-toggle { display: inline-flex; }
  #statusbar .hint { display: none; }
  #optionsbar { gap: 10px; }
  input[type="range"] { width: 80px; }
}

/* ---------- SEO / landing content below the app ---------- */
#content {
  background: #101114; color: var(--text);
  border-top: 1px solid var(--border-soft);
  padding: 56px 20px 40px;
  user-select: text; -webkit-user-select: text;
}
#content .inner { max-width: 780px; margin: 0 auto; }
#content h1 { font-size: 30px; line-height: 1.25; letter-spacing: -.3px; }
#content .lede { color: var(--text-muted); font-size: 16px; margin-top: 12px; max-width: 640px; }
#content h2 { font-size: 20px; margin: 40px 0 10px; }
#content h3 { font-size: 15px; margin: 22px 0 6px; }
#content p, #content li { color: var(--text-muted); font-size: 14.5px; }
#content ul, #content ol { padding-left: 22px; margin-top: 8px; }
#content li { margin: 4px 0; }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 14px; margin-top: 16px; }
.feature {
  background: var(--bg-panel); border: 1px solid var(--border-soft); border-radius: 10px;
  padding: 14px 16px;
}
.feature h3 { margin: 0 0 6px; font-size: 14px; color: var(--text); }
.feature p { font-size: 13px; margin: 0; }
#content footer {
  margin-top: 56px; padding-top: 18px; border-top: 1px solid var(--border-soft);
  display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: center;
  font-size: 12.5px; color: var(--text-dim);
}
#content footer a { color: var(--text-muted); text-decoration: none; }
#content footer a:hover { color: var(--text); }
details { border: 1px solid var(--border-soft); border-radius: 8px; padding: 10px 14px; margin-top: 8px; background: var(--bg-panel); }
details summary { cursor: pointer; color: var(--text); font-size: 14px; font-weight: 500; }
details p { margin-top: 8px; }

/* Pro interest (Phase 0 demand validation) */
#pro-cta {
  margin-top: 18px; padding: 18px;
  background: var(--bg-panel); border: 1px solid var(--border); border-radius: 12px;
}
.pro-price { font-size: 15px; }
.pro-price .anchor { text-decoration: line-through; color: var(--text-dim); margin-right: 4px; }
.pro-price strong { color: var(--accent); }
#pro-form { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; }
#pro-email {
  flex: 1; min-width: 200px;
  background: var(--bg-input); border: 1px solid var(--border-soft); border-radius: var(--radius);
  color: var(--text); padding: 9px 12px; font-size: 14px;
}
#pro-email:focus { outline: 1px solid var(--accent); }
#pro-form-msg { margin-top: 8px; font-size: 13px; min-height: 18px; }
#pro-form-msg.ok { color: #6fd3a3; }
#pro-form-msg.err { color: var(--danger); }

/* Post-export nudge toast */
#pro-nudge {
  position: absolute; right: 14px; bottom: 14px; z-index: 16;
  width: 270px; padding: 14px 16px;
  background: var(--bg-panel); border: 1px solid var(--border); border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0,0,0,.4);
  font-size: 12.5px; color: var(--text-muted);
}
#pro-nudge[hidden] { display: none; }
#pro-nudge strong { color: var(--text); }
.nudge-actions { display: flex; gap: 8px; margin-top: 10px; justify-content: flex-end; }
.nudge-actions .ghostbtn { width: auto; margin: 0; padding: 5px 10px; }
.nudge-actions .primarybtn { padding: 5px 12px; }