/* Учебка — «Мой ИИ-преподаватель», демонстрация. Mobile-first, без внешних библиотек. */
:root {
  --bg: #f0f5f1;
  --card: #ffffff;
  --ink: #16202c;
  --muted: #4a5a6b;
  --line: #d4dce6;
  --accent: #216946;
  --accent-ink: #ffffff;
  --warn-bg: #fff6e3;
  --warn-line: #e0a93b;
  --tap: 44px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  padding: 0 14px 32px;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  overflow-x: hidden;
}

h1 { font-size: 1.3rem; margin: 0 0 8px; }
h2 { font-size: 1.05rem; margin: 0 0 8px; }
.pt-h3 { font-size: 0.95rem; margin: 14px 0 6px; }
p { margin: 0 0 10px; }

.skip-link {
  position: absolute;
  left: -9999px;
}
.skip-link:focus {
  left: 8px;
  top: 8px;
  background: var(--card);
  padding: 10px;
  border: 2px solid var(--accent);
  border-radius: 8px;
  z-index: 10;
}

.pt-header { padding: 14px 0 4px; }
.pt-logo { display: inline-block; min-height: var(--tap); }
.pt-logo img { max-width: 100%; height: auto; display: block; }
.pt-kicker { color: var(--muted); font-size: 0.85rem; margin: 8px 0 6px; }
.pt-lead { color: var(--muted); }

.pt-disclaimer {
  background: var(--warn-bg);
  border: 1px solid var(--warn-line);
  border-left-width: 5px;
  border-radius: 10px;
  padding: 12px;
  margin: 0 0 14px;
}

.pt-card, .pt-gate {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
  margin: 0 0 14px;
}

.pt-note, .pt-status { color: var(--muted); font-size: 0.9rem; }

.pt-plan-list, .pt-nav {
  list-style: none;
  margin: 0 0 10px;
  padding: 0;
}
.pt-plan-list li, .pt-nav li { margin: 0 0 10px; }

.pt-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 10px;
}

.pt-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--tap);
  min-width: var(--tap);
  padding: 10px 14px;
  border: 1px solid var(--accent);
  border-radius: 10px;
  background: var(--card);
  color: var(--accent);
  font: inherit;
  text-decoration: none;
  cursor: pointer;
}

.pt-btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
}

.pt-btn:focus-visible, a:focus-visible {
  outline: 3px solid #0b5fff;
  outline-offset: 2px;
}

.pt-chip[aria-pressed="true"] {
  background: var(--accent);
  color: var(--accent-ink);
}

.pt-btn[disabled] { opacity: 0.55; cursor: not-allowed; }

.pt-answer {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  margin: 10px 0 0;
}

@media (min-width: 760px) {
  body { max-width: 760px; margin: 0 auto; }
}