/* ═══════════ 留白画室 · 极简画廊风 ═══════════ */
:root {
  --bg: #fafafa;
  --ink: #1a1a1a;
  --ink-2: #b0b0b0;
  --hair: #e6e6e6;
  --accent: #ff5c00;
  --sans: "Helvetica Neue", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; }
body {
  font-family: var(--sans);
  background: var(--bg); color: var(--ink);
  display: flex; flex-direction: column;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}
button { font-family: var(--sans); cursor: pointer; background: none; border: none; }

/* ═══ 展签 ═══ */
.label {
  padding: 26px 40px 6px;
  display: flex; align-items: baseline; gap: 18px; flex-wrap: wrap;
}
.label h1 { font-size: 15px; font-weight: 600; letter-spacing: 10px; }
.label-en { font-size: 10px; letter-spacing: 4px; color: var(--ink-2); }

/* ═══ 画布展厅 ═══ */
.hall { flex: 1; padding: 14px 40px 130px; display: flex; }
.easel {
  position: relative; flex: 1;
  background: #fff;
  box-shadow: 0 1px 2px rgba(0,0,0,.05), 0 20px 60px rgba(0,0,0,.08);
  overflow: hidden;
}
.easel canvas { display: block; width: 100%; height: 100%; touch-action: none; cursor: crosshair; }
/* 画框四角 */
.easel-corner {
  position: absolute; width: 14px; height: 14px; pointer-events: none;
}
.easel-corner::before, .easel-corner::after {
  content: ""; position: absolute; background: var(--ink);
}
.easel-corner::before { width: 14px; height: 1.5px; }
.easel-corner::after  { width: 1.5px; height: 14px; }
.tl { top: 10px; left: 10px; }   .tr { top: 10px; right: 10px; }
.bl { bottom: 10px; left: 10px; } .br { bottom: 10px; right: 10px; }
.tr::before, .br::before { right: 0; }
.bl::after, .br::after { bottom: 0; }
.tr::after { right: 0; } .br::after { right: 0; bottom: 0; }
.bl::before { bottom: 0; } .br::before { bottom: 0; }

/* ═══ 悬浮工具岛 ═══ */
.island {
  position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%);
  display: flex; align-items: center; gap: 14px;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(14px);
  border: 1px solid var(--hair);
  border-radius: 999px;
  padding: 10px 20px;
  box-shadow: 0 12px 40px rgba(0,0,0,.14);
  z-index: 50;
  max-width: calc(100vw - 24px);
  overflow-x: auto;
  scrollbar-width: none;
}
.island::-webkit-scrollbar { display: none; }
.isle-group { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.isle-div { width: 1px; height: 26px; background: var(--hair); flex-shrink: 0; }

/* 工具按钮 */
.tool {
  width: 38px; height: 38px; border-radius: 50%;
  display: grid; place-items: center; color: var(--ink-2);
  transition: all .15s; position: relative;
}
.tool svg { width: 19px; height: 19px; }
.tool:hover { color: var(--ink); background: #f2f2f2; }
.tool.on { color: var(--ink); background: #efefef; }
.tool.on::after {
  content: ""; position: absolute; bottom: -3px; left: 50%;
  transform: translateX(-50%); width: 4px; height: 4px;
  border-radius: 50%; background: var(--ink);
}
.tool.accent { color: var(--accent); }
.tool.accent:hover { background: rgba(255, 92, 0, .1); }

/* 颜色点 */
.dot {
  width: 22px; height: 22px; border-radius: 50%;
  border: 2px solid transparent; outline: 1px solid var(--hair);
  outline-offset: 2px; transition: transform .15s; padding: 0;
}
.dot:hover { transform: scale(1.18); }
.dot.on { outline: 1.5px solid var(--ink); outline-offset: 2px; }
.dot.custom { cursor: pointer; background: conic-gradient(red, yellow, lime, cyan, blue, magenta, red); }
.dot.custom::-webkit-color-swatch-wrapper { padding: 2px; }
.dot.custom::-webkit-color-swatch { border: none; border-radius: 50%; }

/* 粗细 */
.size { gap: 10px; }
.size-dot {
  width: 30px; height: 30px; display: grid; place-items: center; flex-shrink: 0;
}
.size-dot::after {
  content: ""; border-radius: 50%; background: var(--ink);
  width: 4px; height: 4px; transition: all .1s;
}
.size input[type="range"] {
  -webkit-appearance: none; appearance: none;
  width: 96px; height: 1.5px; background: var(--hair); outline: none;
}
.size input::-webkit-slider-thumb {
  -webkit-appearance: none; width: 13px; height: 13px; border-radius: 50%;
  background: var(--ink); cursor: pointer;
}
.size input::-moz-range-thumb {
  width: 13px; height: 13px; border-radius: 50%; border: none;
  background: var(--ink); cursor: pointer;
}

/* ═══ 响应式 ═══ */
@media (max-width: 700px) {
  .label { padding: 16px 18px 4px; }
  .label h1 { letter-spacing: 6px; font-size: 14px; }
  .hall { padding: 10px 14px 120px; }
  .island { bottom: 18px; padding: 8px 14px; gap: 10px; border-radius: 20px; }
  .isle-div { display: none; }
  .isle-group { gap: 6px; }
  .tool { width: 34px; height: 34px; }
  .size input[type="range"] { width: 64px; }
}