:root {
  --bg: #ffffff;
  --surface: #f8fafd;
  --surface-2: #ecf0f4;
  --line: #e0e6eb;
  --line-strong: #bcc9d2;
  --text: #1c2226;
  --muted: #4f5d69;
  --accent: #1e5af6;
  --accent-soft: #e8eeff;
  --ok: #138a3e;
  --warn: #b25e00;
  --fix: #1e5af6;
  --grid: #e6ebf0;
  --grid-strong: #cfd8e0;
  --ink: #1c2226;
  --font: 'DM Sans', system-ui, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111416; --surface: #171b1e; --surface-2: #20262a; --line: #283036; --line-strong: #3a454d;
    --text: #eef2f5; --muted: #9aa8b3; --accent: #6f94ff; --accent-soft: #1b2440;
    --ok: #4cc27a; --warn: #f0a34a; --fix: #6f94ff; --grid: #20272c; --grid-strong: #2e373e; --ink: #eef2f5;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #111416; --surface: #171b1e; --surface-2: #20262a; --line: #283036; --line-strong: #3a454d;
  --text: #eef2f5; --muted: #9aa8b3; --accent: #6f94ff; --accent-soft: #1b2440;
  --ok: #4cc27a; --warn: #f0a34a; --fix: #6f94ff; --grid: #20272c; --grid-strong: #2e373e; --ink: #eef2f5;
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; }
body {
  background: var(--bg); color: var(--text);
  font: 15px/1.45 var(--font); letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
}
button, input { font: inherit; color: inherit; letter-spacing: inherit; }
button { cursor: pointer; }
code, .mono { font-family: var(--mono); font-size: 13px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.error { color: var(--warn); }

.ico {
  display: inline-block; width: 20px; height: 20px; flex: none;
  background: currentColor;
  -webkit-mask: var(--i) center / contain no-repeat; mask: var(--i) center / contain no-repeat;
}

/* top bar */
.top {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px; border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 8px; color: var(--text); text-decoration: none; font-weight: 700; font-size: 17px; }
.brand-sub { font-weight: 400; color: var(--muted); }
.pro-pill {
  display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--line);
  background: var(--surface); padding: 6px 12px 6px 10px; border-radius: 999px; font-size: 13px; font-weight: 500;
}
.pro-pill .ico { width: 16px; height: 16px; }
.pro-pill.on { background: var(--accent-soft); border-color: transparent; color: var(--accent); }

/* layout */
.layout {
  display: grid; grid-template-columns: 320px minmax(0, 1fr) 300px;
  min-height: calc(100vh - 61px);
}
.panel { padding: 20px; display: flex; flex-direction: column; gap: 10px; min-width: 0; }
.panel-left { border-right: 1px solid var(--line); }
.panel-right { border-left: 1px solid var(--line); }
.field-label { font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); }
.row-between { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.divider { height: 1px; background: var(--line); margin: 8px 0; }

/* prompt */
.prompt {
  display: flex; align-items: center; gap: 8px; padding: 0 12px;
  border: 1.5px solid var(--text); border-radius: 12px; background: var(--bg);
}
.prompt:focus-within { border-color: var(--accent); }
.prompt .ico { color: var(--accent); }
.prompt input { border: 0; outline: 0; background: none; flex: 1; padding: 12px 0; min-width: 0; font-size: 16px; }
.examples { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  border: 1px solid var(--line); background: var(--surface); border-radius: 999px;
  padding: 4px 10px; font-size: 13px; color: var(--muted);
}
.chip:hover { color: var(--text); border-color: var(--line-strong); }
.chip.on { background: var(--text); color: var(--bg); border-color: var(--text); }
.interpret { background: var(--surface); border-radius: 12px; padding: 12px; display: flex; flex-direction: column; gap: 8px; font-size: 13px; }
.interpret .chips { display: flex; flex-wrap: wrap; gap: 6px; }
.interpret b { font-weight: 700; color: var(--text); }

.search {
  width: 100%; border: 1px solid var(--line); background: var(--surface); border-radius: 10px;
  padding: 9px 12px; outline: 0;
}
.search:focus { border-color: var(--accent); background: var(--bg); }

.icon-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(48px, 1fr)); gap: 4px;
  overflow-y: auto; min-height: 160px; flex: 1; max-height: calc(100vh - 420px); align-content: start;
  padding: 2px;
}
.small-grid { max-height: 168px; min-height: 0; flex: none; }
.tile {
  aspect-ratio: 1; display: grid; place-items: center; border: 1px solid transparent;
  background: none; border-radius: 10px; padding: 0;
}
.tile:hover { background: var(--surface-2); }
.tile.on { border-color: var(--text); background: var(--surface); }
.tile img { width: 24px; height: 24px; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .tile img { filter: invert(1); } }
:root[data-theme="dark"] .tile img { filter: invert(1); }

/* stage */
.stage { padding: 24px; display: flex; flex-direction: column; align-items: center; gap: 20px; min-width: 0; }
.stage-head { width: 100%; max-width: 420px; display: flex; justify-content: space-between; align-items: flex-end; gap: 12px; }
.name { font-family: var(--mono); font-size: 18px; font-weight: 500; }
.canvas-wrap {
  position: relative; width: min(100%, 420px); aspect-ratio: 1;
  border-radius: 24px; background: var(--surface); border: 1px solid var(--line); overflow: hidden;
}
.canvas-wrap .layer { position: absolute; inset: 0; width: 100%; height: 100%; }
.watermark {
  position: absolute; right: 12px; bottom: 10px; font-size: 11px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); opacity: 0.6;
  pointer-events: none;
}
.sizes { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; }
.size-card { display: flex; flex-direction: column; align-items: center; gap: 6px; font-size: 12px; color: var(--muted); }
.size-pair { display: flex; border-radius: 12px; overflow: hidden; border: 1px solid var(--line); }
.size-pair > div { display: grid; place-items: center; width: 64px; height: 64px; }
.size-pair .light { background: #ffffff; }
.size-pair .dark { background: #1c2226; }
.notice {
  width: 100%; max-width: 420px; background: var(--accent-soft); color: var(--text);
  border-radius: 12px; padding: 12px 14px; font-size: 14px;
}
.notice a { color: var(--accent); }
.toggle { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); cursor: pointer; user-select: none; }
.toggle input { accent-color: var(--accent); }

/* modifiers */
.mod-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.mod {
  display: flex; flex-direction: column; align-items: center; gap: 4px; padding: 8px 2px 6px;
  border: 1px solid var(--line); border-radius: 12px; background: var(--bg); font-size: 11px; color: var(--muted);
}
.mod canvas { width: 28px; height: 28px; }
.mod:hover { border-color: var(--line-strong); color: var(--text); }
.mod.on { border-color: var(--text); color: var(--text); background: var(--surface); }

.corners {
  display: grid; grid-template-columns: 1fr 1fr; gap: 4px; width: 84px; height: 84px; padding: 6px;
  border: 1px solid var(--line); border-radius: 14px; background: var(--surface);
}
.corners button { border: 0; border-radius: 6px; background: var(--surface-2); }
.corners button:hover { background: var(--line-strong); }
.corners button.on { background: var(--text); }

.slider { display: flex; flex-direction: column; gap: 4px; font-size: 14px; }
.slider output { font-family: var(--mono); font-size: 12px; color: var(--muted); }
.slider input { width: 100%; accent-color: var(--text); }

.segmented { display: grid; grid-template-columns: repeat(4, 1fr); background: var(--surface-2); border-radius: 10px; padding: 3px; }
.segmented button { border: 0; background: none; border-radius: 8px; padding: 6px 0; font-size: 13px; color: var(--muted); }
.segmented button.on { background: var(--bg); color: var(--text); font-weight: 500; box-shadow: 0 1px 2px rgba(0,0,0,.08); }

.export-row { display: flex; gap: 6px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border: 1px solid var(--line); background: var(--bg); border-radius: 10px; padding: 10px 14px; font-weight: 500;
}
.btn:disabled { opacity: .4; cursor: default; }
.btn.primary { flex: 1; background: var(--text); color: var(--bg); border-color: var(--text); }
.btn.primary:hover { opacity: .9; }
.btn .ico { width: 18px; height: 18px; }

.result { border: 1px solid var(--line); border-radius: 12px; padding: 12px; display: flex; flex-direction: column; gap: 10px; }
.result-head { display: flex; gap: 10px; align-items: center; }
.result-thumb { width: 44px; height: 44px; border-radius: 10px; background: var(--surface); display: grid; place-items: center; color: var(--ink); flex: none; }
.result-thumb svg { width: 24px; height: 24px; }
.checks { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; font-size: 13px; }
.checks li { display: flex; gap: 8px; align-items: flex-start; }
.checks li::before { content: ''; flex: none; width: 8px; height: 8px; border-radius: 50%; margin-top: 6px; background: var(--ok); }
.checks li.fix::before { background: var(--fix); }
.checks li.warn::before { background: var(--warn); }

dialog { border: 0; border-radius: 18px; padding: 0; background: var(--bg); color: var(--text); width: min(92vw, 400px); box-shadow: 0 20px 60px rgba(0,0,0,.25); }
dialog::backdrop { background: rgba(10, 14, 18, .45); }
.dialog-body { padding: 22px; display: flex; flex-direction: column; gap: 10px; }
.dialog-body h2 { margin: 0; font-size: 20px; font-weight: 700; }
.dialog-body p { margin: 0; }
.dialog-body input { border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; background: var(--surface); outline: 0; font-family: var(--mono); }
.dialog-body input:focus { border-color: var(--accent); }
.dialog-actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 6px; }
.dialog-actions .btn.primary { flex: none; }

.toast {
  position: fixed; left: 50%; bottom: 28px; transform: translate(-50%, 20px); opacity: 0;
  background: var(--text); color: var(--bg); padding: 10px 18px; border-radius: 10px; font-size: 14px; font-weight: 500;
  transition: opacity .2s, transform .2s; pointer-events: none;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 1080px) {
  .layout { grid-template-columns: 300px minmax(0, 1fr); }
  .panel-right { grid-column: 1 / -1; border-left: 0; border-top: 1px solid var(--line); }
}
@media (max-width: 720px) {
  .top { padding: 12px 16px; }
  .layout { grid-template-columns: 1fr; }
  .panel, .stage { padding: 16px; }
  .panel-left { border-right: 0; border-bottom: 1px solid var(--line); }
  .stage { order: -1; }
  .icon-grid { max-height: 260px; }
}