:root {
  --ink: #1a1f2e;
  --ink-soft: #5a6478;
  --muted: #8b93a7;
  --line: #e4e7ef;
  --panel: rgba(255, 255, 255, 0.92);
  --panel-solid: #ffffff;
  --canvas: #f0f1f5;
  --dot: #c8cdd8;
  --accent: #0aabb8;
  --accent-2: #e91e8c;
  --accent-dark: #088a95;
  --accent-grad: linear-gradient(135deg, #0aabb8, #e91e8c);
  --danger: #e04b5a;
  --shadow: 0 8px 28px rgba(26, 31, 46, 0.1), 0 2px 6px rgba(26, 31, 46, 0.05);
  --radius: 14px;
  --font: "Nunito", system-ui, sans-serif;
  --display: "Sora", "Nunito", sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  font-family: var(--font);
  color: var(--ink);
  background: var(--canvas);
  -webkit-font-smoothing: antialiased;
}

body.mode-board {
  height: 100%;
  overflow: hidden;
}

button, input, textarea { font: inherit; color: inherit; }

#app {
  position: relative;
  width: 100%;
  height: 100%;
}

.topbar {
  position: absolute;
  inset: 12px 12px auto 12px;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 12px;
  background: var(--panel);
  backdrop-filter: blur(14px);
  border: 1px solid rgba(255,255,255,0.8);
  border-radius: 16px;
  box-shadow: var(--shadow);
}

.topbar-left, .topbar-center, .topbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  text-decoration: none;
}

.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: #0b1020;
  display: grid;
  place-items: center;
  overflow: hidden;
}

.brand-mark img { width: 30px; height: 30px; object-fit: contain; }

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}

.brand-text strong {
  font-family: var(--display);
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
}

.brand-text span {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.board-title {
  border: none;
  background: transparent;
  padding: 6px 10px;
  border-radius: 10px;
  font-weight: 700;
  color: var(--ink-soft);
  cursor: text;
}
.board-title:hover { background: rgba(10,171,184,0.08); color: var(--ink); }

.toolbar {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 20;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px;
  background: var(--panel);
  backdrop-filter: blur(14px);
  border-radius: 16px;
  box-shadow: var(--shadow);
}

.tool, .icon-btn, .shape-opt, .stamp-opt {
  width: 42px;
  height: 42px;
  border: none;
  border-radius: 12px;
  background: transparent;
  color: var(--ink-soft);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: background .15s, color .15s;
}
.tool svg, .shape-opt svg { width: 20px; height: 20px; }
.tool:hover, .icon-btn:hover, .shape-opt:hover, .stamp-opt:hover {
  background: rgba(10,171,184,0.1);
  color: var(--accent-dark);
}
.tool.active, .shape-opt.active {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 6px 14px rgba(10,171,184,0.3);
}
.tool:disabled { opacity: .35; cursor: not-allowed; }
.tool-sep { height: 1px; margin: 4px 6px; background: var(--line); }

.shape-menu, .stamp-menu {
  position: absolute;
  left: 72px;
  top: 50%;
  transform: translateY(-20%);
  z-index: 21;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 8px;
  background: var(--panel-solid);
  border-radius: 14px;
  box-shadow: var(--shadow);
}
.stamp-menu {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  transform: translateY(-10%);
}
.stamp-opt { font-size: 18px; }

.props {
  position: absolute;
  right: 14px;
  top: 88px;
  z-index: 20;
  width: 220px;
  padding: 14px;
  background: var(--panel);
  backdrop-filter: blur(14px);
  border-radius: 16px;
  box-shadow: var(--shadow);
}
.props[hidden], .shape-menu[hidden], .stamp-menu[hidden],
.side-panel[hidden], .share-panel[hidden] { display: none !important; }

.props-label {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 8px;
}
.swatches + .props-label, .props-label + .props-label { margin-top: 12px; }
.swatches { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; }
.swatch {
  width: 28px; height: 28px; border-radius: 999px;
  border: 2px solid transparent; cursor: pointer;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,.08);
}
.swatch.active { border-color: var(--ink); transform: scale(1.08); }
#strokeWidth { width: 100%; accent-color: var(--accent); }
.props-actions { display: flex; flex-direction: column; gap: 6px; margin-top: 12px; }

.ghost-btn {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 10px;
  padding: 8px 12px;
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
  color: var(--ink-soft);
}
.ghost-btn:hover { border-color: var(--accent); color: var(--accent-dark); }
.ghost-btn.danger:hover { border-color: var(--danger); color: var(--danger); }
.ghost-btn.compact { padding: 6px 10px; }

.avatar {
  width: 32px; height: 32px; border-radius: 999px;
  display: grid; place-items: center;
  background: var(--c, var(--accent));
  color: #fff; font-size: 11px; font-weight: 800;
  border: 2px solid #fff;
}

.stage {
  position: absolute;
  inset: 0;
  overflow: hidden;
  cursor: default;
  background: var(--canvas);
  touch-action: none;
}
.stage.tool-hand, .stage.panning { cursor: grab; }
.stage.panning:active, .stage.tool-hand:active { cursor: grabbing; }
.stage.tool-sticky, .stage.tool-shape, .stage.tool-text,
.stage.tool-section, .stage.tool-frame, .stage.tool-stamp,
.stage.tool-image, .stage.tool-pen, .stage.tool-connector,
.stage.tool-comment { cursor: crosshair; }

#board { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.html-layer { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }

.inline-edit {
  position: absolute; z-index: 30;
  min-width: 120px; min-height: 40px; padding: 12px;
  border: 2px solid var(--accent); border-radius: 10px;
  resize: none; outline: none; background: #fffef8;
  box-shadow: var(--shadow); font-weight: 700; line-height: 1.35; overflow: hidden;
}

.zoombar {
  position: absolute; right: 14px; bottom: 14px; z-index: 20;
  display: flex; align-items: center; gap: 4px; padding: 6px;
  background: var(--panel); border-radius: 14px; box-shadow: var(--shadow);
}
.zoom-label {
  border: none; background: transparent; min-width: 56px;
  padding: 8px 6px; font-weight: 800; font-size: 13px;
  color: var(--ink-soft); cursor: pointer; border-radius: 8px;
}
.zoom-label:hover { background: rgba(10,171,184,.1); color: var(--accent-dark); }

.hint {
  position: absolute; left: 50%; bottom: 18px; transform: translateX(-50%);
  z-index: 15; padding: 8px 14px; border-radius: 999px;
  background: rgba(26,31,46,.78); color: #fff;
  font-size: 12px; font-weight: 600; pointer-events: none;
  transition: opacity .4s;
}
.hint.fade { opacity: 0; }

.share-panel, .side-panel {
  position: absolute; top: 72px; right: 14px; z-index: 25;
  width: 320px; max-height: calc(100vh - 100px); overflow: auto;
  padding: 16px; background: var(--panel-solid);
  border-radius: 16px; box-shadow: var(--shadow);
}
.side-panel.left { right: auto; left: 72px; }
.share-panel label, .side-panel label {
  display: block; font-size: 11px; font-weight: 800;
  letter-spacing: .06em; text-transform: uppercase;
  color: var(--muted); margin: 12px 0 6px;
}
.share-panel input, .side-panel input, .side-panel select, .side-panel textarea {
  width: 100%; border: 1px solid var(--line); border-radius: 10px;
  padding: 8px 10px; font-size: 13px; background: #fff;
}
.side-panel textarea { min-height: 72px; resize: vertical; }

.presence-bar {
  position: absolute; top: 72px; left: 50%; transform: translateX(-50%);
  z-index: 25; display: flex; gap: 6px; padding: 6px 10px;
  background: var(--panel); border-radius: 999px; box-shadow: var(--shadow);
}
.presence-dot {
  width: 28px; height: 28px; border-radius: 999px;
  display: grid; place-items: center; font-size: 10px; font-weight: 800;
  color: #fff; border: 2px solid #fff;
}
.view-badge {
  position: absolute; top: 72px; left: 72px; z-index: 25;
  padding: 8px 14px; border-radius: 999px;
  background: rgba(26,31,46,.82); color: #fff;
  font-size: 12px; font-weight: 700;
}

.comment-pin {
  position: absolute; z-index: 18; width: 28px; height: 28px;
  border-radius: 999px; background: var(--accent-2); color: #fff;
  display: grid; place-items: center; font-size: 12px; font-weight: 800;
  box-shadow: var(--shadow); pointer-events: auto; cursor: pointer;
  border: 2px solid #fff;
}

.present-overlay {
  position: fixed; inset: 0; z-index: 100;
  background: #0b1020; color: #fff;
  display: flex; flex-direction: column;
}
.present-overlay[hidden] { display: none !important; }
.present-bar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 16px; background: rgba(255,255,255,.06);
}
.present-stage {
  flex: 1; display: grid; place-items: center; padding: 24px;
}
.present-stage canvas { max-width: 100%; max-height: 100%; border-radius: 12px; }

/* Mobile bottom toolbar */
@media (max-width: 720px) {
  .topbar { inset: 8px; padding: 8px; }
  .brand-text span, .topbar-center { display: none; }
  .toolbar {
    left: 0; right: 0; bottom: 0; top: auto; transform: none;
    flex-direction: row; flex-wrap: nowrap; overflow-x: auto;
    max-width: 100%; border-radius: 16px 16px 0 0;
    padding: 8px 10px calc(8px + env(safe-area-inset-bottom));
    justify-content: flex-start;
  }
  .shape-menu, .stamp-menu {
    left: 8px; bottom: 78px; top: auto; transform: none; flex-direction: row;
  }
  .props, .share-panel, .side-panel {
    top: auto; bottom: 78px; right: 8px; left: 8px; width: auto; max-height: 40vh;
  }
  .zoombar { bottom: 78px; right: 8px; }
  .hint, .presence-bar { display: none; }
  .view-badge { left: 8px; top: 64px; }
}