:root {
  --bg: #faf8f5; --surface: #ffffff; --ink: #1f2430; --muted: #6a7080; --line: #e6e1d8;
  --accent: #3b5bdb; --accent-ink: #ffffff; --accent-soft: #e8edff;
  --good: #2b8a3e; --good-soft: #e6f4ea; --warn: #b45309; --warn-soft: #fff4e0;
  --bad: #c92a2a; --bad-soft: #fdecec; --radius: 12px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161b; --surface: #1d2027; --ink: #eceef3; --muted: #9aa1b2; --line: #2d313b;
    --accent: #7c97ff; --accent-ink: #10131a; --accent-soft: #232a45;
    --good: #69db7c; --good-soft: #1c2b21; --warn: #ffc078; --warn-soft: #33281a;
    --bad: #ff8787; --bad-soft: #35201f;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--accent); }
h1, h2, h3 { line-height: 1.25; margin: 0 0 .5rem; }
h1 { font-size: 1.9rem; } h2 { font-size: 1.3rem; } h3 { font-size: 1.05rem; }
p { margin: 0 0 .8rem; }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px 64px; }
.topbar { border-bottom: 1px solid var(--line); background: var(--surface); }
.topbar .wrap { display: flex; align-items: center; gap: 18px; padding: 12px 16px; flex-wrap: wrap; }
.brand { font-weight: 700; text-decoration: none; color: var(--ink); margin-right: auto; }
.topbar a.nav { text-decoration: none; color: var(--muted); font-size: .95rem; }
.topbar a.nav:hover { color: var(--ink); }
.topbar form { margin: 0; }
.muted { color: var(--muted); } .small { font-size: .88rem; }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; margin: 16px 0;
}
.card h2 { margin-bottom: .25rem; }
.tag {
  display: inline-block; font-size: .78rem; font-weight: 600; letter-spacing: .03em;
  padding: 2px 10px; border-radius: 99px; background: var(--accent-soft); color: var(--accent);
  margin-right: 6px; text-transform: uppercase;
}
.tag.plain { background: transparent; border: 1px solid var(--line); color: var(--muted); }
.btn, button {
  font: inherit; font-weight: 600; cursor: pointer; border-radius: 10px; padding: 10px 18px;
  border: 1px solid var(--accent); background: var(--accent); color: var(--accent-ink);
  text-decoration: none; display: inline-block;
}
.btn.ghost, button.ghost { background: transparent; color: var(--accent); }
.btn.link, button.link { border: 0; background: none; color: var(--muted); padding: 0; font-weight: 400; }
button:disabled { opacity: .55; cursor: default; }
.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.row.between { justify-content: space-between; }

.hint {
  background: var(--warn-soft); border-left: 4px solid var(--warn);
  padding: 10px 14px; border-radius: 6px; margin: 12px 0;
}
.notice { padding: 10px 14px; border-radius: 8px; margin: 12px 0; }
.notice.error { background: var(--bad-soft); color: var(--bad); }
.notice.info { background: var(--accent-soft); }

textarea {
  width: 100%; min-height: 55vh; font: inherit; line-height: 1.65; resize: vertical;
  padding: 16px; border-radius: var(--radius); border: 1px solid var(--line);
  background: var(--surface); color: var(--ink);
}
textarea:focus, input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
input[type=text], input[type=password], select, .field textarea {
  font: inherit; width: 100%; padding: 10px 12px; border-radius: 8px;
  border: 1px solid var(--line); background: var(--surface); color: var(--ink);
}
.field { margin-bottom: 12px; } .field label { display: block; font-weight: 600; margin-bottom: 4px; }
.field textarea { min-height: 90px; }

.counter { font-variant-numeric: tabular-nums; }
.counter.ok { color: var(--good); } .counter.low { color: var(--muted); } .counter.high { color: var(--warn); }
.essay { white-space: pre-wrap; background: var(--surface); border: 1px solid var(--line);
         border-radius: var(--radius); padding: 18px; }

.grade { display: flex; align-items: center; gap: 18px; }
.grade .letter {
  font-size: 3rem; font-weight: 800; line-height: 1; min-width: 86px; text-align: center;
  padding: 14px 10px; border-radius: var(--radius); background: var(--accent-soft); color: var(--accent);
}
.grade .pct { font-size: 1.05rem; color: var(--muted); }
.rubric { display: grid; gap: 14px; margin-top: 8px; }
.crit .head { display: flex; justify-content: space-between; gap: 8px; font-weight: 600; }
.bar { height: 8px; border-radius: 99px; background: var(--line); overflow: hidden; margin: 5px 0 4px; }
.bar > span { display: block; height: 100%; background: var(--accent); border-radius: 99px; }
.quote { border-left: 3px solid var(--accent); padding: 2px 12px; margin: 6px 0; color: var(--muted); font-style: italic; }
.section-good { border-left: 4px solid var(--good); }
.section-try { border-left: 4px solid var(--warn); }
.section-angle { border-left: 4px solid var(--accent); }
ul.clean { list-style: none; padding: 0; margin: 0; }
ul.clean li { margin-bottom: 14px; }

.timeline { list-style: none; padding: 0; margin: 0; }
.timeline li { display: flex; justify-content: space-between; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--line); }
.chart { display: flex; align-items: flex-end; gap: 6px; height: 120px; margin: 12px 0 4px; }
.chart .col { flex: 1; display: flex; flex-direction: column; justify-content: flex-end; align-items: center; height: 100%; min-width: 0; }
.chart .col > span { width: 100%; max-width: 36px; background: var(--accent); border-radius: 6px 6px 0 0; }
.chart .col small { font-size: .7rem; color: var(--muted); margin-top: 3px; }
table { border-collapse: collapse; width: 100%; font-size: .93rem; }
th, td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
.pill { font-size: .78rem; padding: 1px 8px; border-radius: 99px; background: var(--line); }
.pill.on { background: var(--good-soft); color: var(--good); }
.spinner {
  width: 22px; height: 22px; border: 3px solid var(--line); border-top-color: var(--accent);
  border-radius: 50%; animation: spin 0.9s linear infinite; display: inline-block; vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (max-width: 520px) {
  body { font-size: 16px; } h1 { font-size: 1.6rem; }
  .grade .letter { font-size: 2.3rem; min-width: 70px; }
}