:root {
  --ink: #1c1f24;
  --muted: #6b7280;
  --line: #e2e5ea;
  --bg: #eef0f3;
  --panel: #fff;
  --accent: #2d5bd7;
  --ok: #1a7f4b;
  --ng: #c8322a;
  --shadow: 0 1px 3px rgba(16, 20, 28, .12), 0 8px 24px rgba(16, 20, 28, .08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 14px/1.6 "Hiragino Sans", "Noto Sans JP", system-ui, -apple-system, sans-serif;
  -webkit-text-size-adjust: 100%;
  /* iPadで書いている最中に文字選択・拡大鏡・タップハイライトが出ないようにする */
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior-y: contain;
}

/* 確認画面の模範解答だけは選択できてよい */
.c-exp, .review-head { -webkit-user-select: text; user-select: text; }

button, select, input, label { touch-action: manipulation; }

body.reviewing { overflow: hidden; }

/* ------------------------------------------------------------------ ツールバー */

.bar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 18px;
  padding: 8px 14px;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.bar-group { display: flex; align-items: center; gap: 6px; }
.bar-group.right { margin-left: auto; }
.brand { font-size: 15px; letter-spacing: .01em; margin-right: 4px; }

select {
  font: inherit;
  padding: 5px 8px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fff;
  color: inherit;
}

.tool {
  font: inherit;
  padding: 6px 11px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fff;
  cursor: pointer;
  white-space: nowrap;
}
.tool:hover { border-color: #c7ccd4; }
.tool.on { background: var(--accent); border-color: var(--accent); color: #fff; }
.tool.plain { color: var(--muted); }

.toggle { display: inline-flex; align-items: center; gap: 5px; color: var(--muted); cursor: pointer; }

.score { font-size: 17px; font-weight: 700; font-variant-numeric: tabular-nums; }
.score.good { color: var(--ok); }

.status { margin: 10px 14px 0; color: var(--muted); font-size: 13px; }
.status.warn { color: #a2601c; }

/* ------------------------------------------------------------------ プリント */

.sheet {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  padding: 16px 14px 60px;
}

.page {
  position: relative;
  background: #fff;
  box-shadow: var(--shadow);
  border-radius: 2px;
  overflow: hidden;
}

.pdf-canvas, .ink-canvas {
  display: block;
  position: absolute;
  inset: 0;
}
.ink-canvas { cursor: crosshair; }
.sheet.erasing .ink-canvas { cursor: cell; }

.grade-bar { padding: 8px 0 24px; }

.btn {
  font: inherit;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 9px;
  padding: 9px 18px;
  cursor: pointer;
}
.btn.ghost { color: var(--muted); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
.btn.big { padding: 13px 40px; font-size: 16px; border-radius: 11px; }
.btn:hover { filter: brightness(1.05); }

/* ------------------------------------------------------------------ レビュー */

.review {
  position: fixed;
  inset: 0;
  z-index: 100;
  overflow: auto;
  background: rgba(24, 28, 36, .5);
  padding: 28px 16px 60px;
}

.review-box {
  max-width: 860px;
  margin: 0 auto;
  background: var(--panel);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 24px 26px 20px;
}

.review-head h2 { margin: 0 0 6px; font-size: 19px; }
.review-head .lead { margin: 0 0 10px; color: var(--muted); }
.review-head .toggle { font-size: 13px; }

.review-table { margin-top: 16px; border-top: 1px solid var(--line); }

.review-row {
  display: grid;
  grid-template-columns: 52px 1fr 170px 122px;
  gap: 14px;
  align-items: center;
  padding: 11px 4px;
  border-bottom: 1px solid var(--line);
}
.review-row.header {
  font-size: 12px;
  color: var(--muted);
  padding: 7px 4px;
  border-bottom: 1px solid var(--line);
}
.review-row.undecided { background: #fffaf0; }

.c-no { color: var(--muted); font-size: 13px; font-variant-numeric: tabular-nums; }

.c-ans { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.c-ans .ink {
  height: 42px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
  object-position: left center;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 1px 3px;
}
.c-ans .ocr { font-size: 11px; color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.c-ans .blank { color: var(--muted); font-size: 13px; }

.c-exp .word { font-size: 17px; font-weight: 600; letter-spacing: .01em; }
.c-exp .meta { margin-left: 7px; font-size: 11px; color: var(--muted); }

.c-btn { display: flex; gap: 7px; }
.mark {
  font: inherit;
  font-size: 17px;
  width: 50px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #fff;
  cursor: pointer;
}
.mark.ok.on { background: var(--ok); border-color: var(--ok); color: #fff; }
.mark.ng.on { background: var(--ng); border-color: var(--ng); color: #fff; }

.review-foot {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  padding-top: 18px;
}
.empty { color: var(--muted); padding: 18px 0; }

@media (max-width: 720px) {
  .review-row { grid-template-columns: 40px 1fr 96px; row-gap: 8px; }
  .review-row .c-btn { grid-column: 2 / -1; }
  .review-row.header { display: none; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e7e9ee; --muted: #9aa3b2; --line: #333944;
    --bg: #171a1f; --panel: #1e222a; --accent: #5b86ea;
  }
  .bar { background: rgba(30, 34, 42, .92); }
  select, .tool, .btn, .mark, .c-ans .ink { background: #262b34; color: inherit; }
  .btn.primary, .tool.on { background: var(--accent); color: #fff; }
  .review-row.undecided { background: #2a2620; }
  .page { background: #fff; }
}


/* ------------------------------------------------------- タッチ端末（iPadなど） */

@media (pointer: coarse) {
  .bar { gap: 10px 14px; padding: 10px 12px; }
  .tool, .btn, select { min-height: 44px; padding-left: 14px; padding-right: 14px; }
  .mark { width: 68px; height: 52px; font-size: 20px; }
  .btn.big { padding: 15px 34px; }
  .review-row { padding: 14px 4px; }
}

.badge {
  font-size: 12px;
  padding: 3px 9px;
  border-radius: 999px;
  background: #e8f1e8;
  color: var(--ok);
  white-space: nowrap;
}
.badge.bad { background: #fdeceb; color: var(--ng); }

.c-ans .near { font-size: 11px; color: #a2601c; }
.review-bulk { display: flex; gap: 8px; margin-top: 12px; }
.review-bulk .btn { padding: 7px 13px; font-size: 13px; }