/* Верстак — курс столярного дела.
   Белый технический лист: тонкие линии, моноширинные номера, один синий акцент. */

:root {
  --sheet: #ffffff;
  --sheet-2: #f5f4f1;
  --ink: #191918;
  --ink-2: #63625d;
  --hair: #d8d6d0;
  --blue: #1a4fa0;
  --blue-soft: #eaf0f9;

  --text: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "DejaVu Sans Mono", Menlo, Consolas, monospace;

  --col: 1180px;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--sheet);
  color: var(--ink);
  font-family: var(--text);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }

:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }

.col { width: 100%; max-width: var(--col); margin: 0 auto; padding: 0 24px; }
.hidden { position: absolute; left: -9999px; }
.hidden:focus { left: 12px; top: 12px; z-index: 30; background: var(--blue); color: #fff; padding: 8px 14px; }

/* шапка */

.bar { border-bottom: 1px solid var(--hair); background: var(--sheet); }

.bar-in {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px 24px;
  flex-wrap: wrap;
  min-height: 62px;
  padding: 10px 0;
}

.logo { display: flex; align-items: baseline; gap: 10px; }
.logo b { font-size: 1.25rem; font-weight: 700; letter-spacing: -0.01em; }
.logo i { font-style: normal; font-size: 0.8125rem; color: var(--ink-2); }

.links { display: flex; gap: 22px; font-size: 0.9375rem; }
.links a { color: var(--ink-2); padding: 3px 0; border-bottom: 2px solid transparent; }
.links a:hover { color: var(--ink); }
.links a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--blue); }

/* главная */

.hero { padding: 46px 0 36px; border-bottom: 1px solid var(--hair); margin-bottom: 36px; }
.hero h1 {
  font-size: clamp(1.9rem, 4.6vw, 2.9rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.08;
  margin: 0 0 14px;
  max-width: 20ch;
}
.hero p { margin: 0 0 20px; max-width: 58ch; font-size: 1.0625rem; color: var(--ink-2); }

.specs { display: flex; flex-wrap: wrap; gap: 10px 36px; font-family: var(--mono); font-size: 0.8125rem; color: var(--ink-2); }
.specs b { display: block; font-family: var(--text); font-size: 1.25rem; color: var(--ink); font-weight: 700; margin-bottom: 2px; }

.progress {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 16px;
  background: var(--sheet-2);
  border: 1px solid var(--hair);
  margin-bottom: 30px;
  font-size: 0.875rem;
  color: var(--ink-2);
}
.progress-track { flex: 1; height: 5px; background: var(--hair); min-width: 90px; }
.progress-fill { height: 100%; background: var(--blue); width: 0; transition: width .18s ease; }
.progress button {
  background: none; border: none; font: inherit; font-size: 0.875rem;
  color: var(--blue); text-decoration: underline; cursor: pointer; padding: 0;
}

.module { margin-bottom: 40px; }
.module-name {
  display: flex; align-items: baseline; gap: 12px;
  font-family: var(--mono); font-size: 0.8125rem; color: var(--ink-2);
  margin: 0 0 12px; padding-bottom: 8px; border-bottom: 1px solid var(--ink);
  font-weight: 400;
}
.module-name::after { content: ""; flex: 1; }

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

.step {
  display: grid;
  grid-template-columns: 54px 240px minmax(0, 1fr) 40px;
  gap: 20px;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid var(--hair);
}

.step-no { font-family: var(--mono); font-size: 1.0625rem; color: var(--ink-2); }

.step-scheme { border: 1px solid var(--hair); background: var(--sheet-2); }
.step-scheme img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }

.step-title { font-size: 1.0625rem; font-weight: 600; margin: 0 0 4px; line-height: 1.3; }
.step:hover .step-title { color: var(--blue); }
.step-lead { margin: 0; font-size: 0.875rem; color: var(--ink-2); max-width: 68ch; }

.step-done {
  width: 26px; height: 26px;
  border: 1px solid var(--hair);
  background: var(--sheet);
  cursor: pointer;
  font-family: var(--mono);
  font-size: 0.9375rem;
  color: var(--blue);
  line-height: 1;
  padding: 0;
}
.step-done[aria-pressed="true"] { background: var(--blue-soft); border-color: var(--blue); }

/* страница урока */

.lesson { max-width: 900px; margin: 34px auto 60px; }

.crumb { font-family: var(--mono); font-size: 0.8125rem; color: var(--ink-2); margin-bottom: 14px; }
.crumb a { color: var(--blue); }

.stage { position: relative; background: var(--ink); aspect-ratio: 16 / 9; }
.stage video { width: 100%; height: 100%; display: block; }

.stage-msg {
  position: absolute; inset: 0;
  display: none; flex-direction: column; justify-content: center; gap: 10px;
  padding: 30px; background: var(--sheet-2);
}
.stage-msg.on { display: flex; }
.stage-msg h2 { margin: 0; font-size: 1.1875rem; font-weight: 700; }
.stage-msg p { margin: 0; color: var(--ink-2); font-size: 0.9375rem; max-width: 52ch; }

.stage-bar {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px 18px;
  padding: 9px 0 0; font-size: 0.8125rem; color: var(--ink-2);
  font-family: var(--mono);
}
.stage-bar select {
  background: var(--sheet); border: 1px solid var(--hair); color: var(--ink);
  font: inherit; font-size: 0.8125rem; padding: 3px 6px;
}

.lesson h1 {
  font-size: clamp(1.6rem, 3.8vw, 2.2rem);
  font-weight: 700; letter-spacing: -0.025em; line-height: 1.14;
  margin: 24px 0 14px;
}

.lesson-lead { font-size: 1.0625rem; line-height: 1.62; max-width: 66ch; margin: 0 0 26px; color: var(--ink-2); }

.specs-row {
  margin: 0 0 32px; padding: 0;
  border-top: 1px solid var(--hair);
  font-size: 0.9375rem;
}
.specs-row > div {
  display: grid; grid-template-columns: 180px minmax(0, 1fr);
  gap: 16px; padding: 9px 0; border-bottom: 1px solid var(--hair);
}
.specs-row dt { color: var(--ink-2); margin: 0; }
.specs-row dd { margin: 0; font-family: var(--mono); }

.jump { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }

.jump a {
  display: block; padding: 14px 16px; border: 1px solid var(--hair);
}
.jump a:hover { border-color: var(--blue); }
.jump span { display: block; font-family: var(--mono); font-size: 0.75rem; color: var(--ink-2); margin-bottom: 5px; }
.jump b { font-size: 1rem; font-weight: 600; }
.jump .right { text-align: right; }

/* текстовые страницы */

.page { max-width: 68ch; margin: 36px 0 64px; }
.page h1 { font-size: clamp(1.8rem, 4vw, 2.4rem); font-weight: 700; letter-spacing: -0.03em; margin: 0 0 10px; }
.page .lead { font-size: 1.0625rem; color: var(--ink-2); margin: 0 0 28px; }
.page h2 { font-size: 1.1875rem; font-weight: 700; margin: 32px 0 10px; }
.page p { margin: 0 0 14px; line-height: 1.64; }
.page a { color: var(--blue); text-decoration: underline; }

.table { list-style: none; margin: 26px 0 0; padding: 0; border-top: 1px solid var(--hair); }
.table > li {
  display: grid; grid-template-columns: 210px minmax(0, 1fr);
  gap: 16px; padding: 11px 0; border-bottom: 1px solid var(--hair);
  font-size: 0.9375rem;
}
.table .k { color: var(--ink-2); }

/* подвал */

.end { border-top: 1px solid var(--hair); padding: 20px 0 40px; font-size: 0.8125rem; color: var(--ink-2); }
.end-in { display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; }

/* адаптив */

@media (max-width: 900px) {
  .step { grid-template-columns: 44px 160px minmax(0, 1fr) 34px; gap: 14px; }
  .step-lead { display: none; }
}

@media (max-width: 620px) {
  .col { padding: 0 16px; }
  .step { grid-template-columns: 38px 1fr 30px; gap: 12px; }
  .step-scheme { display: none; }
  .specs-row > div, .table > li { grid-template-columns: minmax(0, 1fr); gap: 2px; }
  .jump { grid-template-columns: minmax(0, 1fr); }
  .jump .right { text-align: left; }
}