:root {
  --bg: #f4f5f7;
  --surface: #ffffff;
  --surface-2: #f0f2f5;
  --text: #1c1e21;
  --muted: #667085;
  --border: #dfe3e8;
  --accent: #2f6fed;
  --accent-text: #ffffff;
  --ok: #1a9c5b;
  --danger: #c93b3b;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 4px 12px rgba(16, 24, 40, .06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --surface: #1e2126;
    --surface-2: #272b32;
    --text: #eceef1;
    --muted: #9aa3b2;
    --border: #343941;
    --accent: #5b91ff;
    --accent-text: #0b1220;
    --ok: #3ccf85;
    --danger: #ff7b7b;
    --shadow: none;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.45 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
}

/* Мини-апп рассчитан только на десктоп (macOS) — без адаптива под мобильные. */
body { min-width: 980px; }

.hidden { display: none !important; }

.screen { min-height: 100vh; padding: 24px 32px 32px; }
.screen.center { display: flex; align-items: center; justify-content: center; }

.message-card {
  width: 520px;
  padding: 40px;
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
}
.message-card h1 { margin: 12px 0 8px; font-size: 24px; }
.message-card p { margin: 0 0 24px; color: var(--muted); font-size: 16px; }
.message-icon { font-size: 44px; line-height: 1; }

.topbar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto 20px;
}
.app-title { margin: 0; font-size: 26px; }
.app-subtitle { color: var(--muted); margin-top: 2px; }
.progress {
  padding: 6px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
}
.progress span { color: var(--text); font-weight: 600; }

.layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 24px;
  max-width: 1200px;
  margin: 0 auto;
  align-items: start;
}

.sidebar {
  position: sticky;
  top: 24px;
}
.topic-nav { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.topic-tab {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  width: 100%;
  padding: 12px 14px;
  text-align: left;
  font: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
}
.topic-tab:hover { border-color: var(--accent); }
.topic-tab.active { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent) inset; }
.topic-tab .tab-check { color: var(--ok); font-weight: 700; visibility: hidden; }
.topic-tab.done .tab-check { visibility: visible; }

.content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  box-shadow: var(--shadow);
}

.rules {
  margin-bottom: 20px;
  padding: 14px 18px;
  background: var(--surface-2);
  border-radius: 12px;
  color: var(--muted);
}
.rules-title { color: var(--text); font-weight: 600; margin-bottom: 4px; }
.rules ul { margin: 0; padding-left: 20px; }
.rules li { margin: 2px 0; }

.topic-title { margin: 0 0 4px; font-size: 22px; }
.topic-question { margin: 0 0 16px; color: var(--muted); white-space: pre-wrap; }

.cards { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }

.card {
  display: grid;
  grid-template-columns: 44px 1fr auto auto;
  align-items: center;
  gap: 14px;
  padding: 12px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  cursor: grab;
  user-select: none;
  transition: border-color .12s, box-shadow .12s;
}
.card:hover { border-color: var(--accent); }
.card:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.card.dragging { opacity: .4; }
.card.drop-target { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent) inset; }

.rank {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-text);
  font-size: 18px;
  font-weight: 700;
}
.thesis { white-space: pre-wrap; word-break: break-word; }
.points { color: var(--muted); font-size: 13px; white-space: nowrap; }
.points b { color: var(--text); }

.move { display: flex; flex-direction: column; gap: 4px; }
.move button {
  width: 30px;
  height: 22px;
  padding: 0;
  font-size: 12px;
  line-height: 1;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
}
.move button:hover:not(:disabled) { border-color: var(--accent); }
.move button:disabled { opacity: .35; cursor: default; }

.topic-actions { margin-top: 18px; display: flex; justify-content: flex-end; }

.btn {
  padding: 10px 18px;
  font: inherit;
  font-weight: 600;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
}
.btn:hover:not(:disabled) { border-color: var(--accent); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.primary { color: var(--accent-text); background: var(--accent); border-color: var(--accent); }
.btn.block { width: 100%; }
.btn.confirmed { color: var(--ok); border-color: var(--ok); }

.hint { margin: 10px 2px 0; color: var(--muted); font-size: 13px; }

.modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, .45);
}
.modal-card {
  width: 460px;
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
}
.modal-card h2 { margin: 0 0 10px; }
.modal-card p { margin: 0 0 12px; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 18px; }
.error { color: var(--danger); }