:root {
  --ink: #172b3a;
  --ink-soft: #4d6270;
  --paper: #f7f5ef;
  --surface: #fffdf8;
  --surface-muted: #edf1ee;
  --line: #d5ded8;
  --accent: #e76843;
  --accent-dark: #a93b25;
  --accent-soft: #fff0ea;
  --teal: #1b776c;
  --teal-dark: #14554e;
  --gold: #d4a843;
  --shadow: 0 18px 44px rgba(23, 43, 58, 0.11);
  font-family: "Trebuchet MS", sans-serif;
  color: var(--ink);
  background: var(--paper);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 600px;
  min-height: 100vh;
  background: radial-gradient(circle at 8% 12%, #fff5dc 0, transparent 28%), linear-gradient(135deg, #f7f5ef 0%, #e7f0ed 100%);
  font-size: 16px;
}

button, input { font: inherit; }
button { -webkit-tap-highlight-color: transparent; }

.app-shell {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
  padding: 34px 0 52px;
}

.app-header, .section-heading, .tool-heading-row, .action-row, .results-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.app-header { margin-bottom: 48px; }
.eyebrow, .kicker { margin: 0 0 8px; text-transform: uppercase; letter-spacing: .12em; font-size: .75rem; font-weight: 700; color: var(--teal); }
h1, h2, h3 { margin: 0; font-family: "Trebuchet MS", sans-serif; letter-spacing: 0; }
h1 { font-size: clamp(2rem, 4vw, 3.4rem); line-height: 1; }
h2 { font-size: clamp(1.7rem, 3vw, 2.45rem); }
h3 { font-size: 1.1rem; }

.progress-block { width: 230px; }
.progress-block span { display: block; margin-bottom: 8px; text-align: right; color: var(--ink-soft); font-size: .9rem; font-weight: 700; }
.progress-track { height: 8px; overflow: hidden; border-radius: 99px; background: #d4dfdb; }
.progress-bar { width: 16.67%; height: 100%; border-radius: inherit; background: var(--accent); transition: width 240ms ease; }

.instruction { width: 100%; margin: 18px 0 28px; color: var(--ink-soft); line-height: 1.55; }
.slot-badge { padding: 8px 12px; border: 1px solid #e4c578; border-radius: 6px; color: #765b18; background: #fff5d8; font-size: .85rem; font-weight: 700; white-space: nowrap; }

.notation-panel, .tool-panel { border: 1px solid var(--line); background: rgba(255, 253, 248, .86); box-shadow: var(--shadow); }
.notation-panel { padding: 18px 18px 8px; border-radius: 10px 10px 0 0; }
.notation-meta { display: flex; justify-content: space-between; gap: 20px; color: var(--ink-soft); font-size: .85rem; font-weight: 600; }
.notation-stage { overflow-x: auto; margin-top: 8px; }

.tool-panel { padding: 22px; border-top: 0; border-radius: 0 0 10px 10px; }
.selection-hint { color: var(--ink-soft); font-size: .88rem; }
.accidental-tools { display: flex; align-items: center; gap: 8px; margin-top: 16px; }
.accidental-tool { min-width: 44px; min-height: 44px; padding: 4px 8px; border: 1px solid var(--line); border-bottom: 3px solid #b8c6bf; border-radius: 7px; color: var(--ink); background: var(--surface); cursor: grab; font-family: "Bravura", serif; font-size: 1.8rem; line-height: 1; transition: border-color 160ms ease, background 160ms ease, transform 160ms ease; }
.accidental-tool > * { pointer-events: none; }
.accidental-tool:hover, .accidental-tool:focus-visible, .accidental-tool.is-selected { border-color: var(--accent); background: var(--accent-soft); outline: 3px solid rgba(231, 104, 67, .18); transform: translateY(-2px); }
.accidental-tool:active { cursor: grabbing; }

.answer-row { display: grid; grid-template-columns: auto minmax(190px, 320px) 1fr; align-items: center; gap: 14px; margin-top: 28px; }
.answer-row label { font-weight: 700; }
.answer-row input { width: 100%; padding: 12px 14px; border: 2px solid var(--line); border-radius: 7px; color: var(--ink); background: var(--surface); }
.answer-row input:focus { border-color: var(--accent); outline: 3px solid rgba(231, 104, 67, .18); }
.field-help, .form-status { color: var(--ink-soft); font-size: .86rem; }
.action-row { margin-top: 24px; }
.primary-button, .secondary-button { min-height: 48px; padding: 0 18px; border: 0; border-radius: 7px; font-weight: 700; cursor: pointer; }
.primary-button { color: #fffaf5; background: var(--accent-dark); }
.primary-button:hover, .primary-button:focus-visible { background: #832e1d; outline: 3px solid rgba(231, 104, 67, .25); }
.secondary-button { color: var(--teal-dark); border: 2px solid var(--teal); background: transparent; }
.secondary-button:hover, .secondary-button:focus-visible { color: #fff; background: var(--teal); outline: 3px solid rgba(27, 119, 108, .22); }

.results-view { animation: rise-in 360ms ease both; }
.results-intro { padding: 30px 0 24px; border-bottom: 1px solid var(--line); }
#score-summary { margin: 12px 0 0; color: var(--ink-soft); font-size: 1.1rem; }
.results-list { display: grid; gap: 12px; margin: 24px 0 30px; }
.result-item { display: grid; grid-template-columns: 64px 1fr auto; align-items: start; gap: 16px; padding: 16px; border: 1px solid var(--line); border-left: 5px solid var(--teal); border-radius: 8px; background: var(--surface); }
.result-item.is-wrong { border-left-color: var(--accent); }
.result-number { color: var(--ink-soft); font-family: "Trebuchet MS", sans-serif; font-size: 1.4rem; font-weight: 700; }
.result-name { font-weight: 700; }
.result-detail { margin-top: 4px; color: var(--ink-soft); font-size: .9rem; }
.result-points { grid-column: 2 / -1; justify-self: end; text-align: right; font-weight: 700; white-space: nowrap; }
.result-points .correct { color: var(--teal-dark); }
.result-points .wrong { color: var(--accent-dark); }
.result-notation { grid-column: 2 / -1; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; padding-top: 10px; border-top: 1px solid var(--line); }
.result-notation-label { display: block; margin-bottom: 2px; color: var(--ink-soft); font-size: .75rem; font-weight: 700; }
.result-notation-canvas { min-width: 0; overflow: visible; }
.result-notation-canvas svg { display: block; width: 100%; height: auto; }
.scorm-status { color: var(--ink-soft); font-size: .85rem; }
.app-footer { padding: 0 24px 24px; text-align: center; color: var(--ink-soft); font-size: .8rem; }

[hidden] { display: none !important; }
@keyframes rise-in { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }

@media (max-width: 780px) {
  .app-shell { width: min(100% - 28px, 700px); padding-top: 22px; }
  .app-header { align-items: flex-start; flex-direction: column; margin-bottom: 34px; }
  .progress-block { width: 100%; }
  .progress-block span { text-align: left; }
  .section-heading { align-items: flex-start; flex-direction: column; gap: 14px; }
  .answer-row { grid-template-columns: 1fr; gap: 8px; }
  .field-help { margin-bottom: 4px; }
  .action-row { align-items: flex-start; flex-direction: column; }
  .primary-button { width: 100%; }
  .results-actions { align-items: flex-start; flex-direction: column; }
}