:root {
  --paper: #efe6da;
  --card: #fbf7f2;
  --ink: #1c1916;
  --muted: #6e665d;
  --line: #e4dacd;
  --green: #1c6846;
  --green-ink: #f3faf6;
  --green-soft: #e4f2ea;
  --rust: #9a3d22;
  --rust-soft: #f8ece7;
  --amber-soft: #f8f0dc;
  --shadow: 0 16px 40px rgba(60, 40, 20, 0.08);
  color: var(--ink);
  background: var(--paper);
  font: 15px/1.45 ui-sans-serif, system-ui, sans-serif;
}

* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; }
button, input, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; }
h1, h2, h3, h4 { font-family: "Iowan Old Style", Palatino, Georgia, serif; font-weight: 600; letter-spacing: -0.02em; }
a { color: var(--green); }

.wrap { max-width: 1120px; margin: 0 auto; padding: 28px 20px 64px; }
.top { display: flex; justify-content: space-between; gap: 16px; align-items: flex-end; margin-bottom: 22px; }
.mark { margin: 0; font-size: 32px; line-height: 1; }
.sub { margin: 6px 0 0; color: var(--muted); max-width: 46ch; }
.row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.grid { display: grid; gap: 14px; }
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.card, .stat, .path, .person { background: var(--card); border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); }
.card { padding: 16px; }
.stat { padding: 14px 16px; }
.stat b { display: block; font: 600 28px/1.1 "Iowan Old Style", Palatino, Georgia, serif; }
.stat span, .muted { color: var(--muted); }
label { display: grid; gap: 6px; font-size: 13px; color: var(--muted); }
input, textarea, select {
  width: 100%;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 10px;
  padding: 9px 11px;
}
textarea { min-height: 72px; resize: vertical; }
button.btn, .btn {
  border: 1px solid #d9cec0;
  background: #fff;
  border-radius: 999px;
  padding: 8px 14px;
  text-decoration: none;
}
button.primary { background: var(--green); border-color: var(--green); color: var(--green-ink); }
button.danger { color: var(--rust); }
button:disabled { opacity: .5; cursor: default; }
.tabs { display: flex; gap: 6px; margin: 8px 0 16px; flex-wrap: wrap; }
.tabs button[aria-current="true"] { background: var(--ink); color: #f6f1ea; border-color: var(--ink); }
.banner { padding: 10px 12px; border-radius: 12px; background: var(--rust-soft); color: var(--rust); }
.ok { padding: 10px 12px; border-radius: 12px; background: var(--green-soft); color: var(--green); }
.study-link { display: block; padding: 14px 0; border-top: 1px solid var(--line); text-decoration: none; color: inherit; }
.study-link strong { display: block; font-size: 18px; }
.task { display: grid; gap: 8px; padding-top: 12px; border-top: 1px solid var(--line); }
.steps { margin: 8px 0 0; padding: 0; list-style: none; display: grid; gap: 6px; }
.steps li { display: grid; grid-template-columns: 28px 1fr; gap: 8px; align-items: start; }
.idx { width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; background: var(--green-soft); color: var(--green); font-size: 13px; }
.bar { height: 10px; background: #efe7dc; border-radius: 999px; overflow: hidden; }
.bar i { display: block; height: 100%; background: var(--green); }
.funnel { display: grid; gap: 8px; }
.funnel div { display: grid; grid-template-columns: minmax(140px, 1.4fr) 1fr auto; gap: 10px; align-items: center; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.chip { border-radius: 999px; padding: 4px 8px; background: var(--green-soft); color: #145236; font-size: 13px; }
.chip.extra { background: var(--amber-soft); color: #6d4a10; }
.chip.misclick { background: var(--rust-soft); color: var(--rust); }
.arrow { color: var(--muted); }
.path, .person { padding: 12px 14px; display: grid; gap: 8px; }
.path header, .person header { display: flex; justify-content: space-between; gap: 8px; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); vertical-align: top; }
.frame-box { overflow: auto; background: #e7dfd3; border-radius: 16px; border: 1px solid var(--line); padding: 12px; }
.frame-scale { transform-origin: top left; }
iframe.screen { border: 0; background: white; display: block; box-shadow: var(--shadow); }
.legend { display: flex; gap: 12px; font-size: 13px; color: var(--muted); }
.swatch { width: 10px; height: 10px; border-radius: 50%; display: inline-block; margin-right: 4px; }
.split { display: grid; grid-template-columns: 1.1fr .9fr; gap: 14px; }
.login { max-width: 460px; margin: 12vh auto; }
code, .mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 12px; word-break: break-all; }
@media (max-width: 800px) {
  .cards, .split, .funnel div { grid-template-columns: 1fr; }
  .mark { font-size: 28px; }
}