:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --ink: #1c2333;
  --muted: #5b6478;
  --accent: #2f5fe0;
  --accent-dark: #234bb5;
  --ok: #1d9e6f;
  --warn: #c2571b;
  --err: #c0392b;
  --border: #dde3ef;
  --radius: 14px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
}

main.card {
  max-width: 720px;
  margin: 40px auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 36px;
  box-shadow: 0 8px 24px rgba(28, 35, 51, 0.06);
}

.center { text-align: center; }

header.topbar {
  max-width: 720px;
  margin: 18px auto 0;
  padding: 0 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand { font-weight: 700; color: var(--accent-dark); text-decoration: none; }

.lang-toggle button {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px 10px;
  cursor: pointer;
  font-weight: 600;
  color: var(--muted);
}
.lang-toggle button.active { color: var(--accent-dark); border-color: var(--accent); }

h1 { font-size: 1.7rem; margin-top: 0; }
h2 { font-size: 1.25rem; }
p.muted, span.muted, small.muted { color: var(--muted); }

button.primary {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}
button.primary:hover { background: var(--accent-dark); }
button.primary:disabled { opacity: 0.55; cursor: wait; }

button.secondary {
  background: none;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 20px;
  font-size: 0.95rem;
  cursor: pointer;
  color: var(--ink);
}

label { display: block; font-weight: 600; margin: 16px 0 6px; }

input[type="text"], input[type="email"], input[type="number"], input[type="url"], select, textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 1rem;
  font-family: inherit;
  background: #fff;
  color: var(--ink);
}
textarea { min-height: 140px; resize: vertical; }

.checkbox-row { display: flex; gap: 10px; align-items: flex-start; margin: 14px 0; }
.checkbox-row input { margin-top: 4px; width: auto; }
.checkbox-row label { margin: 0; font-weight: 400; }

.notice { border-radius: 10px; padding: 12px 16px; margin: 16px 0; }
.notice.error { background: #fdecea; color: var(--err); }
.notice.warn { background: #fdf3e7; color: var(--warn); }
.notice.ok { background: #e8f7f0; color: var(--ok); }
.notice.info { background: #eaf0fd; color: var(--accent-dark); }

.mode-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 20px; }
@media (max-width: 620px) { .mode-grid { grid-template-columns: 1fr; } }

.mode-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  background: #fff;
  text-align: left;
  font: inherit;
}
.mode-card:hover { border-color: var(--accent); }
.mode-card h3 { margin: 0 0 8px; color: var(--accent-dark); }
.mode-card p { margin: 0; color: var(--muted); font-size: 0.93rem; }

.question-block { border-top: 1px solid var(--border); padding-top: 18px; margin-top: 18px; }
.question-block h3 { margin: 0 0 6px; }

.score-hero { font-size: 3.4rem; font-weight: 800; color: var(--accent-dark); margin: 6px 0; }

.feedback-item { border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px; margin: 12px 0; }
.feedback-item .qtitle { font-weight: 700; }
.feedback-item .score { float: right; font-weight: 700; color: var(--accent-dark); }
.feedback-item .qtext { font-size: 0.92rem; margin: 6px 0 8px; }
.feedback-item details { margin-top: 8px; margin-bottom: 8px; }
.feedback-item summary { cursor: pointer; color: var(--muted); font-size: 0.9rem; font-weight: 600; }
.feedback-item .answer-text { margin: 8px 0 0; padding: 10px 12px; background: var(--bg); border-radius: 8px; white-space: pre-wrap; }

.share-box {
  display: flex; gap: 10px; margin: 14px 0; align-items: center;
}
.share-box input { flex: 1; }

.spinner {
  display: inline-block; width: 22px; height: 22px;
  border: 3px solid var(--border); border-top-color: var(--accent);
  border-radius: 50%; animation: spin 0.9s linear infinite; vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }

footer.foot {
  max-width: 720px; margin: 10px auto 40px; padding: 0 8px;
  color: var(--muted); font-size: 0.88rem;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px;
}
footer.foot a { color: var(--muted); }

.hidden { display: none !important; }