/* Direction: SIMS Classroom — a calm chalk-and-ink classroom: cool paper, deep indigo, a chalk-yellow highlight, rounded friendly type */
/* Completed by the platform from the short form: both modes, every
   palette token, each text-on-ground pair at its floor. To restyle, write the
   short form again (the decisions in one :root) and it is completed again. */

:root {
  --canvas: #f5f6fc;
  --surface: #ffffff;
  --surface-2: #eaedf9;
  --border: #d4d5dd;
  --border-strong: #aeafb9;
  --ink: #1b1f3b;
  --muted: #535979;
  --accent: #4338ca;
  --accent-hover: #3930ac;
  --accent-ink: #ffffff;
  --accent-text: #3730a3;
  --accent-strong: #4338ca;
  --accent-soft: #dcdbf5;
  --accent-border: #a5a1e6;
  --success: #15803d;
  --success-ink: #ffffff;
  --success-soft: #dae8e5;
  --success-strong: #137638;
  --warning: #b45309;
  --warning-ink: #ffffff;
  --warning-soft: #ede2df;
  --warning-strong: #a64c08;
  --danger: #b91c1c;
  --danger-ink: #ffffff;
  --danger-soft: #eedce1;
  --danger-strong: #b91c1c;
  --chart-1: #4338ca;
  --chart-2: #b7269d;
  --chart-3: #892500;
  --chart-4: #7b6a14;
  --chart-5: #0f5c38;
  --chart-6: #0d7a91;

  --font-display: "Outfit", "Nunito Sans", system-ui, sans-serif;
  --font-body: "Nunito Sans", system-ui, sans-serif;
  --display-weight: 700;
  --display-tracking: -0.01em;
  --radius-card: 18px;
  --radius-btn: 12px;
  --radius-input: 12px;
  --x-paper: #ffffff;
  --x-band: #1d1b4b;
  --x-on-photo: #ffffff;
  --x-chalk: #fcd34d;
  --font-mono: "JetBrains Mono Variable", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-sans: "Nunito Sans", system-ui, sans-serif;
  --eyebrow-tracking: 0.08em;
}

html[data-theme="dark"] {
  --canvas: #070614;
  --surface: #201f2c;
  --surface-2: #131220;
  --border: #2a2935;
  --border-strong: #51515b;
  --ink: #f5f6fc;
  --muted: #96969f;
  --accent: #4338ca;
  --accent-hover: #5f56d2;
  --accent-ink: #ffffff;
  --accent-text: #847bdc;
  --accent-strong: #847bdc;
  --accent-soft: #14113c;
  --accent-border: #221c66;
  --success: #15803d;
  --success-ink: #ffffff;
  --success-soft: #0a211d;
  --success-strong: #499c68;
  --warning: #b45309;
  --warning-ink: #ffffff;
  --warning-soft: #2d1712;
  --warning-strong: #c57a40;
  --danger: #b91c1c;
  --danger-ink: #ffffff;
  --danger-soft: #2e0b16;
  --danger-strong: #d16969;
  --chart-1: #5b5aed;
  --chart-2: #da4bbc;
  --chart-3: #dc4306;
  --chart-4: #9d881e;
  --chart-5: #04995d;
  --chart-6: #149bb7;
}

/* SIMS Classroom — navigation, whiteboard, PDF viewer and quiz choices */

.nav-link {
  display: flex; align-items: center; gap: 0.75rem; padding: 0.65rem 0.85rem;
  border-radius: 0.9rem; font-weight: 700; font-size: 0.92rem; color: var(--muted);
  transition: background 0.15s, color 0.15s;
}
.nav-link:hover { background: var(--surface-2); color: var(--ink); }
.nav-link.is-active { background: var(--accent-soft); color: var(--accent-strong); }
.nav-pill {
  display: inline-flex; align-items: center; gap: 0.4rem; white-space: nowrap;
  padding: 0.45rem 0.85rem; border-radius: 999px; font-size: 0.85rem; font-weight: 700;
  color: var(--muted); background: var(--surface-2); transition: background 0.15s, color 0.15s;
}
.nav-pill:hover { color: var(--ink); }
.nav-pill.is-active { background: var(--accent); color: var(--accent-ink); }
.nav-link .icon, .nav-pill .icon { width: 1.1rem; height: 1.1rem; flex: none; }
.nav-link:focus-visible, .nav-pill:focus-visible, .tool:focus-visible, .swatch:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px;
}

/* ---- whiteboard ---- */
.board-bar {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem 1rem; padding: 0.5rem;
  margin-bottom: 0.75rem; border: 1px solid var(--border); border-radius: var(--radius-card);
  background: var(--surface-2);
}
.tool {
  display: inline-grid; place-items: center; width: 2.4rem; height: 2.4rem; border-radius: 0.7rem;
  border: 1px solid var(--border); background: var(--surface); color: var(--ink);
  transition: background 0.15s, transform 0.1s;
}
.tool:hover { background: var(--accent-soft); }
.tool:active { transform: scale(0.94); }
.tool.is-on { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.swatch {
  width: 1.7rem; height: 1.7rem; border-radius: 50%; border: 2px solid var(--surface);
  box-shadow: 0 0 0 1px var(--border-strong); transition: transform 0.1s;
}
.swatch:hover { transform: scale(1.1); }
.swatch.is-on { box-shadow: 0 0 0 3px var(--accent); }
.board-wrap {
  position: relative; overflow: hidden; border: 1px solid var(--border-strong);
  border-radius: var(--radius-card); background: var(--x-paper);
}
.board-wrap canvas {
  display: block; width: 100%; height: auto; touch-action: none; cursor: crosshair; background: var(--x-paper);
}
.board-text {
  position: absolute; min-width: 9rem; padding: 0; border: 1px dashed var(--accent);
  background: transparent; font-family: var(--font-body); font-weight: 600; line-height: 1; outline: none;
}

/* ---- PDF viewer ---- */
.pdf { overflow: hidden; border: 1px solid var(--border); border-radius: var(--radius-card); background: var(--surface); }
.pdf [hidden] { display: none !important; }
.pdf-bar {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.4rem; padding: 0.5rem;
  border-bottom: 1px solid var(--border); background: var(--surface-2);
}
.pdf-scroll { min-height: 20rem; max-height: 72vh; overflow: auto; padding: 0.75rem; background: var(--surface-2); }
.pdf canvas { background: var(--x-paper); box-shadow: var(--shadow-card); max-width: none; }
.pdf:fullscreen { display: flex; flex-direction: column; border-radius: 0; }
.pdf:fullscreen .pdf-scroll { flex: 1; max-height: none; }

/* ---- sign-up: teachers do not need a classroom ID ---- */
dialog:has(#su-teacher:checked) [data-student-only] { display: none; }
dialog:has(#su-teacher:checked) [data-teacher-only] { display: block; }

/* ---- quiz answers ---- */
.choice {
  display: flex; align-items: center; gap: 0.75rem; padding: 0.75rem 1rem; cursor: pointer;
  border: 1px solid var(--border); border-radius: 0.9rem; background: var(--surface);
  transition: border-color 0.15s, background 0.15s;
}
.choice:hover { border-color: var(--accent); }
.choice:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
.choice input { width: 1.1rem; height: 1.1rem; accent-color: var(--accent); }