:root {
  --paper: #f4efe4;
  --paper-strong: #fffdf8;
  --ink: #1d2a2a;
  --muted: #5b6663;
  --rule: #d7cbb8;
  --mark: #b42318;
  --mark-deep: #8d1a12;
  --forest: #215c4b;
  --shadow: 0 18px 40px rgba(47, 38, 22, 0.08);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background:
    linear-gradient(180deg, rgba(255,253,248,0.2), rgba(244,239,228,0.9)),
    repeating-linear-gradient(
      180deg,
      transparent,
      transparent 31px,
      rgba(215, 203, 184, 0.28) 32px
    );
  background-color: var(--paper);
  color: var(--ink);
  font-family: "Figtree", "Segoe UI", sans-serif;
  line-height: 1.5;
}

body {
  min-height: 100vh;
}

.skip-link {
  position: absolute;
  left: -999px;
}

.shell {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header, .site-footer {
  background: rgba(255, 253, 248, 0.92);
  border-bottom: 1px solid var(--rule);
}

.site-footer {
  border-top: 1px solid var(--rule);
  border-bottom: 0;
  margin-top: 64px;
}

.header-row, .footer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  min-height: 76px;
}

.footer-row {
  color: var(--muted);
  font-size: 0.95rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border: 2px solid var(--ink);
  font-family: "Fraunces", Georgia, serif;
  font-weight: 700;
  background: #fff;
}

.brand-copy {
  display: flex;
  flex-direction: column;
}

.brand-copy strong {
  font-family: "Fraunces", Georgia, serif;
  font-size: 1.2rem;
}

.brand-copy em {
  font-style: normal;
  color: var(--muted);
  font-size: 0.85rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 16px;
}

.site-nav a, .text-button {
  color: var(--ink);
  text-decoration: none;
  background: none;
  border: 0;
  font: inherit;
  cursor: pointer;
  padding: 0;
}

.nav-cta {
  border: 1px solid var(--ink);
  padding: 8px 12px;
}

.site-main {
  padding: 36px 0 8px;
}

.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 36px;
  align-items: start;
  margin-bottom: 28px;
}

.hero h1, h1, h2, h3 {
  font-family: "Fraunces", Georgia, serif;
  letter-spacing: -0.02em;
}

.hero h1 {
  font-size: clamp(2.2rem, 4vw, 4rem);
  line-height: 1.05;
  margin: 0 0 16px;
}

.lede {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 36rem;
}

.panel {
  background: var(--paper-strong);
  border: 1px solid var(--rule);
  box-shadow: var(--shadow);
  padding: 24px;
}

.panel h2 {
  margin-top: 0;
}

label, .field-label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
}

.problem-list {
  display: grid;
  gap: 12px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}

.problem-type {
  border: 1px solid var(--rule);
  padding: 12px 14px;
  background: #fff;
}

.problem-type label {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin: 0;
  font-weight: 600;
}

.difficulty {
  display: none;
  margin: 10px 0 0 26px;
  color: var(--muted);
}

.problem-type:has(input[type="checkbox"]:checked) .difficulty {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.choice-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.choice-row label {
  font-weight: 500;
}

.button, input[type="submit"], button.button {
  appearance: none;
  border: 0;
  background: var(--mark);
  color: #fff;
  padding: 12px 16px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}

.button:hover, input[type="submit"]:hover {
  background: var(--mark-deep);
}

.button.secondary {
  background: var(--forest);
}

.button.ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--ink);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.flash {
  padding: 12px 14px;
  margin-bottom: 18px;
  border: 1px solid var(--rule);
}

.flash-notice {
  background: #e8f3ee;
}

.flash-alert {
  background: #fbeaea;
}

.worksheet-preview ol {
  columns: 1;
  padding-left: 20px;
}

.worksheet-preview.wide ol {
  columns: 2;
}

.worksheet-preview li {
  margin: 0 0 14px;
  break-inside: avoid;
}

.auth-panel, .narrow {
  max-width: 460px;
}

input[type="email"], input[type="password"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--rule);
  background: #fff;
  font: inherit;
  margin-bottom: 14px;
}

.error-list {
  color: var(--mark);
  padding-left: 18px;
}

.worksheet-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.worksheet-list li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--rule);
}

.muted { color: var(--muted); }

.meta-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  color: var(--muted);
}

@media (max-width: 800px) {
  .hero, .header-row, .footer-row, .worksheet-list li {
    grid-template-columns: 1fr;
    flex-direction: column;
    align-items: flex-start;
  }

  .worksheet-preview.wide ol {
    columns: 1;
  }
}