:root {
  --paper: #f3efe4;
  --sheet: #fffdf8;
  --ink: #1c1915;
  --muted: #5e584e;
  --line: #e4d3c4;
  --margin: #e7b2a6;
  --pencil: #b42318;
  --green: #1f6b4a;
  --chip: #efe6d4;
  --shadow: 0 18px 50px rgba(55, 32, 18, 0.07);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(180, 35, 24, 0.05), transparent 28%),
    var(--paper);
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.55;
}
a { color: inherit; }
img { max-width: 100%; }

.sheet {
  width: min(920px, calc(100% - 28px));
  margin: 22px auto 40px;
  background: var(--sheet);
  border: 1px solid #eadfce;
  border-left: 3px solid var(--margin);
  box-shadow: var(--shadow);
}

header {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: end;
  padding: 28px 36px 18px;
  border-bottom: 1px solid var(--line);
}
.brand { text-decoration: none; }
.brand b {
  display: block;
  font-family: Georgia, "Iowan Old Style", Palatino, serif;
  font-size: 32px;
  letter-spacing: -0.04em;
  font-weight: 700;
}
.brand span { color: var(--muted); font-size: 14px; }
nav { display: flex; flex-wrap: wrap; gap: 8px 16px; padding-bottom: 6px; }
nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
nav a:hover, nav a[aria-current="page"] { color: var(--ink); }

main { padding: 34px 36px 18px; }
h1, h2, h3 { font-family: Georgia, "Iowan Old Style", Palatino, serif; font-weight: 700; letter-spacing: -0.03em; }
h1 { font-size: clamp(38px, 6vw, 62px); line-height: 0.98; margin: 0 0 16px; }
h2 { font-size: 30px; margin: 34px 0 10px; }
h3 { font-size: 22px; margin: 0 0 8px; }
p { margin: 0 0 14px; }
.lede { font-size: 19px; max-width: 640px; color: #332e27; }

.kicker {
  color: var(--pencil);
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 22px 0 8px; }
.button, button {
  appearance: none;
  border: 0;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 16px;
  background: var(--ink);
  color: #fffdf8;
  font: inherit;
}
.button.ghost { background: transparent; color: var(--ink); border: 1px solid #cfc3b2; }
button:disabled { opacity: 0.6; cursor: wait; }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 28px; }
.card, .lesson, .level {
  background: #fff;
  border: 1px solid var(--line);
  padding: 16px;
}
.card span, .meta { display: block; color: var(--green); font-size: 13px; margin-bottom: 6px; }
.lesson a, .level { text-decoration: none; display: block; }
.lesson:hover { border-color: #c8ad96; }

.phrase {
  margin-top: 28px;
  padding: 18px 18px 8px;
  background: var(--chip);
}
.phrase q { font-family: Georgia, serif; font-size: 28px; line-height: 1.2; display: block; margin-bottom: 8px; }
.note { color: var(--muted); font-size: 14px; }

.split { display: grid; grid-template-columns: 1.3fr 0.7fr; gap: 22px; align-items: start; }
.login {
  border: 1px solid var(--line);
  background: #fff;
  padding: 18px;
}
label { display: block; font-size: 14px; margin: 12px 0 6px; }
input {
  width: 100%;
  min-height: 44px;
  border: 1px solid #d9cbb8;
  background: #fffdf8;
  color: var(--ink);
  font: inherit;
  padding: 0 12px;
}
.error { color: var(--pencil); min-height: 1.2em; font-size: 14px; }
.example { font-family: Georgia, serif; font-size: 22px; margin: 8px 0; }
.example i { color: var(--pencil); font-style: normal; }
table { width: 100%; border-collapse: collapse; margin: 10px 0 18px; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: 13px; color: var(--muted); font-weight: 600; }

footer {
  padding: 8px 36px 28px;
  color: var(--muted);
  font-size: 14px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

@media (max-width: 760px) {
  header, main, footer { padding-left: 18px; padding-right: 18px; }
  header, footer, .split, .grid { display: block; }
  nav { margin-top: 14px; }
  .card, .lesson, .level, .login { margin-top: 12px; }
  h1 { font-size: 40px; }
}