:root {
  --bg: #f4f5f7;
  --panel: #ffffff;
  --ink: #1f2933;
  --muted: #6b7280;
  --accent: #2563eb;
  --border: #d8dde3;
  --danger: #dc2626;
  --shadow: 0 1px 3px rgba(0, 0, 0, .12), 0 1px 2px rgba(0, 0, 0, .08);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
  -webkit-tap-highlight-color: transparent;
}

.view { display: none; height: 100%; flex-direction: column; }
.view.active { display: flex; }

.hidden { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.spacer { flex: 1; }
.error { color: var(--danger); min-height: 1.2em; margin: .4rem 0 0; }

/* ---- buttons / inputs ---- */
button, .google-btn {
  font: inherit;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  padding: .5rem .9rem;
  border-radius: 8px;
  cursor: pointer;
}
button:hover { filter: brightness(1.05); }
button.secondary { background: var(--panel); color: var(--ink); border-color: var(--border); }
button.small { padding: .3rem .6rem; }
button:disabled { opacity: .55; cursor: default; }

input, select, textarea {
  font: inherit;
  padding: .5rem .6rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  color: var(--ink);
}

/* ---- auth ---- */
#view-auth { align-items: center; justify-content: center; }
.auth-card {
  background: var(--panel);
  padding: 2.5rem;
  border-radius: 16px;
  box-shadow: var(--shadow);
  width: min(92vw, 380px);
  text-align: center;
}
.auth-card h1 { margin: 0 0 .25rem; }
.google-btn {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  text-decoration: none;
  background: #fff;
  color: #3c4043;
  border: 1px solid var(--border);
  font-weight: 600;
  margin-top: 1rem;
}

/* ---- top bar ---- */
.topbar {
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: .6rem 1rem;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.avatar { width: 28px; height: 28px; border-radius: 50%; }

.content { flex: 1; overflow: auto; padding: 1.2rem; }
.toolbar { display: flex; gap: .6rem; margin-bottom: 1.2rem; }
.toolbar input { flex: 1; }

/* ---- card grid (notebooks / pages) ---- */
.card-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
}
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  cursor: pointer;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.card:hover { border-color: var(--accent); }
.card .thumb { height: 120px; background-size: cover; background-position: center; border-bottom: 1px solid var(--border); }
.card .label { padding: .6rem .7rem; display: flex; align-items: center; gap: .4rem; }
.card .label .name { flex: 1; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.card .del { background: none; border: none; color: var(--muted); cursor: pointer; padding: 0 .2rem; }
.card .del:hover { color: var(--danger); }
.badge { font-size: .7rem; color: var(--muted); border: 1px solid var(--border); border-radius: 6px; padding: 0 .35rem; }

/* ---- settings ---- */
.settings { max-width: 640px; }
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 1.2rem 1.4rem;
  margin-bottom: 1.2rem;
}
.panel h3 { margin: 0 0 .6rem; }
.panel label { display: block; margin: .6rem 0 .2rem; font-size: .9rem; color: var(--muted); }
.panel label input { display: block; width: 100%; margin-top: .2rem; }
.panel .row { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: 1rem; }
.panel .check { display: flex; align-items: center; gap: .5rem; color: var(--ink); margin: .5rem 0; }
.panel .check input { width: auto; margin: 0; }
.targets { border: 1px solid var(--border); border-radius: 8px; margin: .8rem 0 0; padding: .4rem .8rem .8rem; }
.targets legend { font-size: .85rem; color: var(--muted); padding: 0 .3rem; }

/* ---- editor ---- */
.editor-bar { flex-wrap: wrap; }
.tools { display: flex; align-items: center; gap: .4rem; }
.tool { background: var(--panel); color: var(--ink); border-color: var(--border); }
.tool.active { background: var(--accent); color: #fff; border-color: var(--accent); }
#size { width: 90px; }

.canvas-wrap {
  flex: 1;
  overflow: auto;
  display: flex;
  justify-content: center;
  padding: 1.2rem;
  position: relative;
  background: #e9ebee;
}
#canvas {
  background: #fff;
  box-shadow: var(--shadow);
  touch-action: none; /* let us handle stylus/touch via pointer events */
  border-radius: 2px;
  max-width: 100%;
  height: auto;
}
.text-input {
  position: absolute;
  border: 1px dashed var(--accent);
  background: rgba(255,255,255,.85);
  padding: 2px 4px;
  resize: none;
  overflow: hidden;
  line-height: 1.2;
  min-width: 40px;
}