:root {
  --ink: #1f2328;
  --muted: #6b7480;
  --line: #e3e6ea;
  --bg: #ffffff;
  --soft: #f4f5f7;
  --brand: #1f2328;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 8px 24px -6px rgba(16, 24, 40, .16);
  --r: 14px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  overscroll-behavior: none;
}

body {
  font: 14px/1.4 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

#board {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  height: 100dvh;
  display: block;
  touch-action: none;
  cursor: crosshair;
}

/* ── 顶部工具坞 ─────────────────────────────────────── */
.dock {
  position: fixed;
  top: max(14px, env(safe-area-inset-top));
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: calc(100vw - 28px);
  padding: 7px 10px;
  background: rgba(255, 255, 255, .92);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  backdrop-filter: saturate(180%) blur(14px);
  border: 1px solid var(--line);
  border-radius: var(--r);
  box-shadow: var(--shadow);
  z-index: 20;
  animation: drop .28s cubic-bezier(.2, .8, .3, 1);
}

@keyframes drop {
  from { opacity: 0; transform: translate(-50%, -8px); }
  to   { opacity: 1; transform: translate(-50%, 0); }
}

.grp { display: flex; align-items: center; gap: 2px; }

.sep { width: 1px; height: 22px; background: var(--line); flex: none; }
.sep.v { height: 20px; margin: 0 2px; }

.tbtn {
  width: 34px; height: 34px;
  display: grid; place-items: center;
  border: 0; border-radius: 9px;
  background: transparent;
  color: #41474f;
  cursor: pointer;
  transition: background .14s, color .14s, transform .1s;
}
.tbtn svg, .ib svg {
  width: 18px; height: 18px;
  fill: none; stroke: currentColor;
  stroke-width: 1.9; stroke-linecap: round; stroke-linejoin: round;
}
.tbtn:hover { background: var(--soft); color: var(--ink); }
.tbtn:active { transform: scale(.94); }
.tbtn.on { background: var(--brand); color: #fff; }
.tbtn:focus-visible, .ib:focus-visible, .btn:focus-visible, .dot:focus-visible {
  outline: 2px solid #1971c2; outline-offset: 2px;
}

.colors { display: flex; gap: 5px; padding: 0 2px; }
.dot {
  width: 19px; height: 19px; padding: 0;
  border-radius: 50%;
  border: 1px solid rgba(0, 0, 0, .12);
  background: var(--c);
  cursor: pointer;
  position: relative;
  transition: transform .12s;
}
.dot:hover { transform: scale(1.12); }
.dot.on::after {
  content: "";
  position: absolute; inset: -4px;
  border: 2px solid var(--ink);
  border-radius: 50%;
}

.sel {
  display: inline-flex; align-items: center; gap: 5px;
  color: var(--muted); font-size: 12px;
  padding: 0 3px;
}
.sel > span { white-space: nowrap; }
.sel select {
  font: inherit; font-size: 12.5px;
  color: var(--ink);
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 7px;
  padding: 4px 4px;
  cursor: pointer;
}
.sel select:focus-visible { outline: 2px solid #1971c2; outline-offset: 1px; }

/* ── 底部操作条 ─────────────────────────────────────── */
.hud {
  position: fixed;
  bottom: max(14px, env(safe-area-inset-bottom));
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 6px 8px;
  background: rgba(255, 255, 255, .92);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  backdrop-filter: saturate(180%) blur(14px);
  border: 1px solid var(--line);
  border-radius: var(--r);
  box-shadow: var(--shadow);
  z-index: 21;
  animation: fade .3s ease;
}

@keyframes fade { from { opacity: 0; } to { opacity: 1; } }

.ib {
  width: 32px; height: 32px;
  display: grid; place-items: center;
  border: 0; border-radius: 8px;
  background: transparent;
  color: #41474f;
  cursor: pointer;
  transition: background .14s, color .14s;
}
.ib:hover { background: var(--soft); color: var(--ink); }
.ib:active { transform: scale(.95); }
.ib[disabled] { opacity: .34; cursor: default; background: none; }

.zoom {
  font-size: 11.5px;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  min-width: 38px;
  text-align: center;
  user-select: none;
}

/* 自动保存状态 */
.save {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 0 7px;
  font-size: 11.5px;
  color: #8a9199;
  white-space: nowrap;
  user-select: none;
  transition: color .2s;
}
.save::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #2f9e44;
  flex: none;
  transition: background .2s;
}
.save.saving { color: #b07200; }
.save.saving::before { background: #f08c00; }
.save.error { color: #e03131; }
.save.error::before { background: #e03131; }

.btn {
  font: inherit; font-size: 13px;
  padding: 7px 12px;
  border-radius: 9px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  white-space: nowrap;
  transition: background .14s, border-color .14s, transform .1s;
}
.btn:hover { background: var(--soft); border-color: #d5d9de; }
.btn:active { transform: scale(.97); }
.btn.solid { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn.solid:hover { background: #000; border-color: #000; }

/* ── 文字编辑浮层 ───────────────────────────────────── */
.editor {
  position: fixed;
  z-index: 30;
  min-width: 80px;
  padding: 2px 5px;
  border: 1.5px solid #1971c2;
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  box-shadow: 0 6px 20px -6px rgba(16, 24, 40, .3);
  outline: none;
}

/* ── 提示与吐司 ─────────────────────────────────────── */
.tip {
  position: fixed;
  left: max(18px, env(safe-area-inset-left));
  top: max(16px, env(safe-area-inset-top));
  margin: 0;
  font-size: 12px;
  color: #9aa3ad;
  pointer-events: none;
  z-index: 10;
  transition: opacity .6s;
}
.tip.hide { opacity: 0; }

.toast {
  position: fixed;
  left: 50%;
  bottom: max(26px, calc(env(safe-area-inset-bottom) + 14px));
  transform: translate(-50%, 12px);
  padding: 9px 16px;
  border-radius: 10px;
  background: rgba(31, 35, 40, .93);
  color: #fff;
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .22s, transform .22s;
  z-index: 40;
}
.toast.on { opacity: 1; transform: translate(-50%, 0); }

/* ── 小屏 ───────────────────────────────────────────── */
@media (max-width: 900px) {
  .dock {
    left: max(10px, env(safe-area-inset-left));
    right: max(10px, env(safe-area-inset-right));
    transform: none;
    flex-wrap: wrap;
    gap: 6px;
    max-width: none;
    padding: 6px 8px;
    animation: none;
  }
  .tools { overflow-x: auto; scrollbar-width: none; max-width: 100%; }
  .tools::-webkit-scrollbar { display: none; }
  .props { flex-wrap: wrap; }
  .hud {
    top: auto;
    bottom: max(10px, env(safe-area-inset-bottom));
    left: max(10px, env(safe-area-inset-left));
    right: max(10px, env(safe-area-inset-right));
    transform: none;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 4px;
    animation: none;
  }
  .tip { display: none; }
  .btn { flex: 1; text-align: center; }
}

@media (max-width: 420px) {
  .sel span { display: none; }
  .zoom { display: none; }
  .sep.v { display: none; }
  .save { font-size: 0; gap: 0; padding: 0 4px; }
  .save::before { width: 8px; height: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}