:root {
  --ink: #1a1a2e;
  --muted: #6b7280;
  --accent: #2f5496;
  --border: #e2e5eb;
  --bg: #f7f8fa;
  --card: #ffffff;
  --good: #1a7f37;
  --error: #c0392b;
}

* { box-sizing: border-box; }

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

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}

.topbar h1 { font-size: 18px; margin: 0; }
.topbar-right { display: flex; gap: 16px; align-items: center; font-size: 14px; }
.muted { color: var(--muted); }
.link { color: var(--accent); text-decoration: none; }
.link:hover { text-decoration: underline; }

.layout {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 20px;
  padding: 24px;
  max-width: 1200px;
  margin: 0 auto;
}

@media (max-width: 800px) {
  .layout { grid-template-columns: 1fr; }
}

.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
}

.form-panel label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin: 14px 0 6px;
}
.form-panel label:first-child { margin-top: 0; }

.form-panel select,
.form-panel input[type="text"],
.form-panel input[type="number"],
.form-panel input[type="password"] {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
}

.form-panel button,
.actions button,
.answer-block ~ button {
  margin-top: 18px;
  width: 100%;
  padding: 10px 16px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}
.form-panel button:disabled { opacity: 0.6; cursor: default; }

.error { color: var(--error); font-size: 13px; }

.loading {
  padding: 16px;
  background: #fff8e1;
  border: 1px solid #ffe0a3;
  border-radius: 8px;
  margin-bottom: 16px;
  font-size: 14px;
}

.result-header h2 { margin: 0 0 4px; font-size: 18px; }
.result-header .meta { color: var(--muted); font-size: 12px; margin-bottom: 10px; }
.result-header .actions { display: flex; gap: 10px; margin-bottom: 20px; }
.result-header .actions button {
  margin-top: 0;
  width: auto;
  background: #eef1f6;
  color: var(--ink);
  font-weight: 500;
}

.passage {
  background: #fbfbfd;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 20px;
  white-space: pre-wrap;
  line-height: 1.6;
  font-size: 14px;
}

.question-card {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 14px;
}

.q-text { font-weight: 600; margin-bottom: 10px; line-height: 1.5; }

.options { display: flex; flex-direction: column; gap: 6px; margin-bottom: 10px; }
.option { display: flex; gap: 8px; padding: 6px 10px; border-radius: 6px; background: #fafafa; }
.opt-letter { font-weight: 700; color: var(--accent); }
.option.correct-answer.reveal { background: #e7f6ec; }
.option.correct-answer.reveal .opt-letter { color: var(--good); }

.answer-block {
  border-top: 1px dashed var(--border);
  padding-top: 10px;
  font-size: 13px;
}
.answer-block.hidden-answer { display: none; }
.answer-block strong { color: var(--good); }

.raw-fallback pre {
  white-space: pre-wrap;
  background: #fafafa;
  padding: 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  font-size: 13px;
}

/* Auth page */
.auth-page {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
}
.auth-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 32px;
  width: 320px;
}
.auth-card h1 { font-size: 18px; margin: 0 0 4px; }
.auth-card label { display: block; font-size: 13px; font-weight: 600; margin: 14px 0 6px; }
.auth-card select, .auth-card input {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
}
.auth-card button {
  margin-top: 20px;
  width: 100%;
  padding: 10px 16px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}