:root {
  --primary: #4f46e5;
  --primary-soft: #eceafc;
  --primary-ink: #3730a3;
  --bg: #f6f5f3;
  --surface: #ffffff;
  --surface-2: #f1efe9;
  --ink: #1c1b1a;
  --ink-soft: #5b5750;
  --ink-faint: #8b867c;
  --ghost: #6b665c;
  --border: #e7e3dd;
  --border-strong: #d7d2c4;
  --good: #2f9e5b;
  --good-soft: #e7f5ec;
  --bad: #d64545;
  --bad-soft: #fbe9e9;
  --amber: #b5790a;
  --amber-soft: #fbf0dc;
  --radius: 10px;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --type-scale: 1;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary-ink); }
button { font-family: inherit; }
h1, h2, h3 { margin: 0 0 8px; line-height: 1.25; }
h1 { font-size: 22px; font-weight: 700; letter-spacing: -.01em; }
h2 { font-size: 18px; font-weight: 600; }
h3 { font-size: 15px; font-weight: 600; color: var(--ink-soft); }
p { margin: 0 0 12px; }

#app { min-height: 100vh; display: flex; flex-direction: column; }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  height: 56px; padding: 0 20px; border-bottom: 1px solid var(--border); background: var(--surface);
  position: sticky; top: 0; z-index: 10;
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 600; text-decoration: none; color: var(--ink); }
.brand img { width: 26px; height: 26px; border-radius: 6px; }
.topnav { display: flex; gap: 4px; }
.topnav a {
  padding: 7px 12px; border-radius: 8px; text-decoration: none; color: var(--ink-soft); font-size: 14px; font-weight: 500;
}
.topnav a.active, .topnav a:hover { background: var(--primary-soft); color: var(--primary-ink); }

main.view { flex: 1; max-width: 880px; width: 100%; margin: 0 auto; padding: 24px 20px 60px; }
@media (max-width: 640px) {
  main.view { padding: 16px 14px 48px; }
  .topbar { height: 48px; padding: 0 14px; }
  .brand span { display: none; }
  .topnav { gap: 2px; }
  .topnav a { padding: 6px 9px; font-size: 13px; }
  .session-sticky { top: 48px; }
}

.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; margin-bottom: 16px;
}

.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; font-weight: 600; color: var(--ink-soft); margin-bottom: 6px; }
.field input[type="text"], .field input[type="password"], .field input[type="number"], .field select, .field textarea {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border-strong); border-radius: 8px;
  font-family: inherit; font-size: 15px; background: var(--surface); color: var(--ink);
}
.field textarea { min-height: 110px; resize: vertical; font-family: var(--font-mono); font-size: 14px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 10px 18px; border-radius: 8px; border: 1px solid transparent;
  font-size: 14.5px; font-weight: 600; cursor: pointer; text-decoration: none;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-ink); }
.btn-secondary { background: var(--surface); color: var(--ink); border-color: var(--border-strong); }
.btn-secondary:hover { background: var(--surface-2); }
.btn-danger { background: var(--bad-soft); color: var(--bad); border-color: transparent; }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; }

.segmented { display: flex; flex-wrap: wrap; gap: 8px; }
.segmented button {
  padding: 10px 14px; border-radius: 8px; border: 1px solid var(--border-strong); background: var(--surface);
  cursor: pointer; font-size: 14px; font-weight: 500; color: var(--ink-soft); text-align: left;
}
.segmented button.selected { border-color: var(--primary); background: var(--primary-soft); color: var(--primary-ink); }
.segmented button small { display: block; font-weight: 400; color: var(--ink-faint); margin-top: 2px; }

.device-toggle { display: flex; gap: 8px; }
.device-toggle button {
  flex: 1; padding: 14px; border-radius: 10px; border: 1px solid var(--border-strong); background: var(--surface);
  cursor: pointer; font-size: 15px; font-weight: 600; color: var(--ink-soft);
}
.device-toggle button.selected { border-color: var(--primary); background: var(--primary-soft); color: var(--primary-ink); }

.badge {
  display: inline-block; padding: 2px 9px; border-radius: 100px; font-size: 11.5px; font-weight: 600;
  background: var(--surface-2); color: var(--ink-soft);
}
.badge-draft { background: var(--amber-soft); color: var(--amber); }
.badge-published { background: var(--good-soft); color: var(--good); }
.badge-archived { background: var(--surface-2); color: var(--ink-faint); }

.translation-toggle {
  border: 1px dashed var(--border-strong); border-radius: 8px; padding: 10px 12px; margin: 10px 0;
  background: var(--surface-2);
}
.translation-toggle > summary {
  cursor: pointer; font-size: 13.5px; font-weight: 600; color: var(--primary-ink); list-style: none;
}
.translation-toggle > summary::-webkit-details-marker { display: none; }
.translation-toggle > summary::before { content: "▸ "; }
.translation-toggle[open] > summary::before { content: "▾ "; }
.translation-toggle .translation-body { margin-top: 8px; color: var(--ink-soft); font-size: 14.5px; }

/* --- session (typing) screen --- */
.session-sticky {
  position: sticky; top: 56px; z-index: 5; background: var(--surface);
  margin: -20px -20px 0; padding: 16px 20px 0; border-radius: var(--radius) var(--radius) 0 0;
  border-bottom: 1px solid var(--border);
}
.session-meta { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; font-size: 13.5px; color: var(--ink-soft); }
.session-meta .stats { display: flex; gap: 16px; font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.session-meta-right { display: flex; align-items: center; gap: 14px; }

.text-size-toggle { display: inline-flex; align-items: center; gap: 2px; background: var(--surface-2); border-radius: 8px; padding: 3px; }
.text-size-toggle button {
  border: none; background: transparent; border-radius: 6px; padding: 3px 9px; line-height: 1.5;
  font-weight: 700; color: var(--ink-soft); cursor: pointer; font-family: var(--font-body);
}
.text-size-toggle button.selected { background: var(--surface); color: var(--primary-ink); box-shadow: 0 1px 2px rgba(28, 27, 26, .12); }

.progress-bar { height: 6px; background: var(--surface-2); border-radius: 100px; overflow: hidden; margin-bottom: 18px; }
.progress-bar > div {
  height: 100%; width: 100%; background: var(--primary);
  transform: scaleX(0); transform-origin: left; transition: transform .15s ease;
}

.flawed-prompt {
  background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 18px; margin-bottom: 16px; font-size: calc(17px * var(--type-scale)); line-height: 1.75; color: var(--ink);
}

.typing-box {
  font-family: var(--font-mono); font-size: calc(20px * var(--type-scale)); line-height: 1.85;
  background: var(--surface); border: 1px solid var(--border-strong); border-radius: var(--radius);
  padding: 20px; min-height: 140px; white-space: pre-wrap; word-break: break-word;
}
.typing-box .ch-correct { color: var(--good); background: var(--good-soft); border-radius: 2px; }
.typing-box .ch-wrong { color: var(--bad); background: var(--bad-soft); text-decoration: underline; text-decoration-color: var(--bad); border-radius: 2px; }
.typing-box .ch-upcoming { color: var(--ghost); }
.typing-box .ch-cursor { position: relative; }
.typing-box .ch-cursor::before {
  content: ""; position: absolute; left: -1px; top: 0.08em; bottom: 0.08em; width: 2px;
  background: var(--primary); border-radius: 1px;
  animation: caret-fade 1s ease-in-out infinite;
}
@keyframes caret-fade { 0%, 100% { opacity: 0; } 50% { opacity: 1; } }
@media (prefers-reduced-motion: reduce) {
  .typing-box .ch-cursor::before { animation: none; opacity: 1; }
}
/* correction modes (tipe 3/5) hide the upcoming glyph but keep the caret bar visible,
   so position tracking survives even though the correct text isn't previewed */
.typing-box.no-ghost .ch-upcoming { color: transparent; }

.hidden-input {
  position: absolute; opacity: 0; height: 0; width: 0; pointer-events: none;
}

.blank-input {
  font-family: var(--font-mono); font-size: 16px; border: none; border-bottom: 2px solid var(--primary);
  background: var(--primary-soft); padding: 1px 4px; border-radius: 3px; text-align: center;
  color: var(--ink); min-width: 3ch;
}
.blank-input.correct { border-color: var(--good); background: var(--good-soft); }
.blank-input.incorrect { border-color: var(--bad); background: var(--bad-soft); }
.blank-paragraph { font-size: calc(18px * var(--type-scale)); line-height: 2.1; background: var(--surface); border: 1px solid var(--border-strong); border-radius: var(--radius); padding: 18px; }

.gap-marker {
  display: block; margin: 12px 0; padding: 12px 14px; border: 1px dashed var(--border-strong);
  border-radius: 8px; background: var(--surface-2);
}
.gap-marker textarea { width: 100%; min-height: 70px; font-family: inherit; font-size: calc(15px * var(--type-scale)); border: 1px solid var(--border-strong); border-radius: 8px; padding: 8px 10px; }

/* --- result --- */
.score-row { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 18px; }
.score-tile { flex: 1; min-width: 120px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; }
.score-tile .label { font-size: 11.5px; text-transform: uppercase; letter-spacing: .04em; color: var(--ink-faint); margin-bottom: 4px; }
.score-tile .val { font-size: 22px; font-weight: 700; font-family: var(--font-mono); }
.score-tile.good .val { color: var(--good); }
.score-tile.bad .val { color: var(--bad); }

.diff-render { font-family: var(--font-mono); font-size: calc(16px * var(--type-scale)); line-height: 1.9; white-space: pre-wrap; word-break: break-word; }
.diff-render .ch-correct { color: var(--good); }
.diff-render .ch-wrong { color: var(--bad); background: var(--bad-soft); text-decoration: line-through; }
.diff-render .ch-missing { color: var(--bad); background: var(--bad-soft); opacity: .8; }

.answer-block { border-top: 1px solid var(--border); margin-top: 16px; padding-top: 16px; }
.answer-block h3 { font-size: 14px; color: var(--ink-soft); }

/* --- history --- */
table.data-table { width: 100%; border-collapse: collapse; font-size: 14px; }
table.data-table th {
  text-align: left; font-size: 11.5px; text-transform: uppercase; letter-spacing: .03em; color: var(--ink-faint);
  padding: 8px 10px; border-bottom: 1px solid var(--border-strong); white-space: nowrap;
}
table.data-table td { padding: 9px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
table.data-table tr:hover td { background: var(--surface-2); cursor: pointer; }
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); }
.table-wrap table { min-width: 560px; }

.filters { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; }
.filters select, .filters input { padding: 7px 10px; border-radius: 8px; border: 1px solid var(--border-strong); font-size: 13.5px; }

.stat-strip { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 18px; }
.stat-strip .card { flex: 1; min-width: 130px; margin-bottom: 0; padding: 14px 16px; }
.stat-strip .label { font-size: 11.5px; text-transform: uppercase; color: var(--ink-faint); margin-bottom: 4px; }
.stat-strip .val { font-size: 20px; font-weight: 700; font-family: var(--font-mono); }

/* --- admin --- */
.admin-shell { display: grid; grid-template-columns: 200px 1fr; gap: 20px; }
@media (max-width: 720px) { .admin-shell { grid-template-columns: 1fr; } }
.admin-nav { display: flex; flex-direction: column; gap: 2px; }
.admin-nav a { padding: 8px 10px; border-radius: 8px; text-decoration: none; color: var(--ink-soft); font-size: 14px; }
.admin-nav a.active, .admin-nav a:hover { background: var(--primary-soft); color: var(--primary-ink); }
.empty-state { text-align: center; padding: 40px 20px; color: var(--ink-faint); }
.muted { color: var(--ink-faint); font-size: 13px; }
.error-msg { color: var(--bad); background: var(--bad-soft); border-radius: 8px; padding: 10px 12px; font-size: 14px; margin-bottom: 12px; }
.notice-msg { color: var(--primary-ink); background: var(--primary-soft); border-radius: 8px; padding: 10px 12px; font-size: 14px; margin-bottom: 12px; }