:root {
  --paper: #f4efe4;
  --ink: #1c1915;
  --muted: #5c564c;
  --line: #d9d0c0;
  --card: #fffaf1;
  --accent: #0f6e62;
  --accent-ink: #04332d;
  --warn: #8a3b12;
  --ok: #1f6b3a;
  --shadow: 0 12px 30px rgba(28, 25, 21, 0.08);
  --sans: "Segoe UI", "Helvetica Neue", sans-serif;
  --mono: "SFMono-Regular", Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: light;
}

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(15, 110, 98, 0.08), transparent 28%),
    var(--paper);
  line-height: 1.5;
}

a {
  color: var(--accent-ink);
}

.wrap {
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 64px;
}

.hero,
.panel,
.lesson,
.banner,
.quiz,
.actions {
  background: var(--card);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.hero {
  padding: 28px;
  margin-bottom: 20px;
}

.kicker {
  margin: 0 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.75rem;
  color: var(--muted);
}

h1,
h2,
h3 {
  margin: 0 0 8px;
  line-height: 1.2;
}

.lede {
  max-width: 62ch;
  color: var(--muted);
}

.progress-row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 20px;
}

.bar {
  flex: 1;
  height: 14px;
  border: 1px solid var(--line);
  background: #ebe4d6;
  overflow: hidden;
}

.bar > span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--accent);
  transition: width 160ms ease;
}

.percent {
  font-family: var(--mono);
  font-size: 0.95rem;
  min-width: 4ch;
}

.layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 20px;
}

.panel,
.banner,
.actions {
  padding: 20px;
}

.banner {
  margin-bottom: 20px;
  border-color: #c9ddd8;
}

.next-link {
  display: inline-block;
  margin-top: 8px;
  padding: 8px 12px;
  background: var(--accent);
  color: white;
  text-decoration: none;
  font-weight: 600;
}

.lesson {
  padding: 18px;
  margin-bottom: 14px;
}

.lesson-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
}

.meta {
  color: var(--muted);
  font-size: 0.9rem;
}

.pill {
  font-family: var(--mono);
  font-size: 0.75rem;
  padding: 2px 8px;
  border: 1px solid var(--line);
  color: var(--muted);
}

.pill.done {
  border-color: var(--ok);
  color: var(--ok);
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 10px 0 14px;
}

.checks,
.quiz-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.checks li,
.quiz-item {
  margin: 8px 0;
}

button,
.file-btn {
  font: inherit;
  border: 1px solid var(--line);
  background: #fff;
  padding: 8px 12px;
  cursor: pointer;
}

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 3px solid #111;
  outline-offset: 2px;
}

.choice {
  display: block;
  margin: 6px 0;
}

.feedback {
  min-height: 1.4em;
  font-size: 0.9rem;
}

.feedback.ok {
  color: var(--ok);
}

.feedback.bad {
  color: var(--warn);
}

.footnote,
.small {
  color: var(--muted);
  font-size: 0.92rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
  align-items: center;
}

@media (max-width: 860px) {
  .layout {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .bar > span {
    transition: none;
  }
}