:root {
  --paper: #fffaf1;
  --card: #ffffff;
  --ink: #23201c;
  --muted: #6b645a;
  --line: #ece4d6;
  --red: #e85d4a;
  --yellow: #f4b63f;
  --blue: #3f8fd2;
  --green: #4fa36b;
  --radius: 14px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.6 ui-rounded, "SF Pro Rounded", "Nunito", system-ui, -apple-system, "Segoe UI", sans-serif;
}
a { color: var(--blue); }
img { max-width: 100%; height: auto; display: block; }

.top {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 24px;
  max-width: 1160px; margin: 0 auto; padding: 18px 20px;
}
.logo { display: flex; align-items: center; gap: 4px; font-weight: 800; font-size: 22px; color: var(--ink); text-decoration: none; letter-spacing: -.3px; }
.logo .dot { width: 12px; height: 12px; border-radius: 50%; display: inline-block; }
.logo .d1 { background: var(--red); } .logo .d2 { background: var(--yellow); } .logo .d3 { background: var(--blue); margin-right: 8px; }
.top nav { display: flex; flex-wrap: wrap; gap: 4px 18px; }
.top nav a { color: var(--ink); text-decoration: none; font-weight: 600; font-size: 15px; }
.top nav a:hover { color: var(--red); }

main { max-width: 1160px; margin: 0 auto; padding: 0 20px 48px; }
h1 { font-size: clamp(30px, 4.5vw, 44px); line-height: 1.15; letter-spacing: -.5px; margin: 8px 0 16px; }
h1 small { display: block; font-size: .45em; color: var(--muted); font-weight: 600; letter-spacing: 0; margin-top: 6px; }
h2 { font-size: 26px; margin: 40px 0 16px; }
.crumbs { font-size: 14px; color: var(--muted); margin-top: 8px; }
.crumbs a { color: var(--muted); }

.hero { padding: 24px 0 8px; max-width: 760px; }
.hero p, .intro { font-size: 18px; color: #3d3831; max-width: 780px; }
.howto { background: #fff3d6; border-radius: 10px; padding: 10px 14px; font-size: 16px; }

.filters { display: flex; gap: 8px; margin: 20px 0 4px; flex-wrap: wrap; }
.filters button { border: 2px solid var(--line); background: var(--card); border-radius: 999px; padding: 6px 16px; font: inherit; font-size: 15px; font-weight: 700; cursor: pointer; color: var(--ink); }
.filters button.on { border-color: var(--ink); background: var(--ink); color: #fff; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 24px; margin-top: 20px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column; }
.card[hidden] { display: none; }
.thumb { display: block; border-bottom: 1px solid var(--line); background: #fff; }
.thumb img { transition: transform .2s; }
.thumb:hover img { transform: scale(1.02); }
.card-body { padding: 14px 16px 16px; display: flex; flex-direction: column; flex: 1; }
.card h3 { font-size: 18px; line-height: 1.3; margin: 8px 0 6px; }
.card p { font-size: 15px; color: var(--muted); margin: 0 0 14px; flex: 1; }
.level { align-self: flex-start; font-size: 12px; font-weight: 800; text-transform: uppercase; letter-spacing: .6px; padding: 2px 10px; border-radius: 999px; }
.level-easy { background: #e3f4e8; color: #2d7a47; }
.level-medium { background: #fff0cc; color: #8a5a00; }
.level-detailed { background: #fde5e1; color: #b0402f; }
.actions { display: flex; gap: 8px; }
.btn { flex: 1; text-align: center; border: 2px solid var(--ink); background: #fff; color: var(--ink); border-radius: 10px; padding: 8px 6px; font: inherit; font-size: 14px; font-weight: 800; white-space: nowrap; text-decoration: none; cursor: pointer; }
.btn.primary { background: var(--ink); color: #fff; flex: 1.6; }
.btn.pin { border-color: #e60023; color: #e60023; }
.btn:hover { transform: translateY(-1px); }

.topic-row { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 20px; }
.topic { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; text-decoration: none; color: var(--ink); }
.topic img { aspect-ratio: 4 / 3; object-fit: cover; object-position: center 40%; width: 100%; border-bottom: 1px solid var(--line); }
.topic span { display: block; padding: 10px 14px 12px; font-weight: 800; font-size: 17px; }
.topic em { display: block; font-style: normal; font-weight: 600; font-size: 14px; color: var(--muted); }
.topic:hover { border-color: var(--ink); }

.tips { max-width: 780px; }
.tips li { margin-bottom: 6px; }
.prose { max-width: 720px; }

.foot { border-top: 1px solid var(--line); text-align: center; color: var(--muted); font-size: 14px; padding: 24px 20px 40px; }
.foot a { color: var(--muted); }

@media (max-width: 560px) {
  body { font-size: 16px; }
  .grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .card-body { padding: 10px; }
  .card h3 { font-size: 15px; }
  .card p { display: none; }
  .actions { flex-wrap: wrap; }
  .btn.primary { flex-basis: 100%; }
}
@media print { .top, .foot, .filters, .actions { display: none; } }