:root {
  --bg: #f7f7f8; --fg: #1a1a1a; --accent: #2563eb; --error: #dc2626;
  --card-bg: #ffffff; --border: #e2e2e5;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg); color: var(--fg); font-size: 16px; line-height: 1.5;
}
.centered-card {
  min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 16px;
}
.card {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 12px;
  padding: 32px; width: 100%; max-width: 380px;
}
input[type="email"], input[type="text"], select {
  width: 100%; padding: 12px; font-size: 16px; border: 1px solid var(--border);
  border-radius: 8px; margin-bottom: 12px; min-height: 44px; background: var(--card-bg); color: var(--fg);
  -webkit-appearance: none; appearance: none;
}
button {
  width: 100%; padding: 12px; font-size: 16px; border: none; border-radius: 8px;
  background: var(--accent); color: white; cursor: pointer; min-height: 44px; margin-bottom: 12px;
  -webkit-tap-highlight-color: transparent;
}
button:last-child { margin-bottom: 0; }
button:disabled { opacity: 0.6; cursor: not-allowed; }
.btn-inline { width: auto; display: inline-block; padding: 10px 16px; margin-bottom: 0; }
.error-text { color: var(--error); font-size: 14px; margin-top: 8px; min-height: 1em; }
.hidden { display: none !important; }

header.app-header {
  display: flex; flex-wrap: wrap; gap: 10px; justify-content: space-between; align-items: center;
  padding: 12px 16px; border-bottom: 1px solid var(--border); background: var(--card-bg);
}
header.app-header a { color: var(--accent); text-decoration: none; }
.header-actions {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center;
}
.lang-toggle {
  display: flex; align-items: center; gap: 8px; font-size: 14px; white-space: nowrap;
}
.lang-toggle select { width: auto; min-height: 36px; padding: 6px 10px; margin-bottom: 0; }

main.app-main { max-width: 720px; margin: 0 auto; padding: 20px 16px 40px; }
.question-card {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 12px; padding: 20px;
  margin-bottom: 16px;
}
.progress-bar { font-size: 14px; color: #555; margin-bottom: 12px; }
.explanation-box {
  background: #fff7ed; border: 1px solid #fed7aa; border-radius: 8px; padding: 12px; margin-top: 12px; margin-bottom: 12px;
}
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.5);
  display: flex; align-items: center; justify-content: center; padding: 16px; z-index: 1000;
}
.modal-box {
  background: var(--card-bg); border-radius: 12px; padding: 24px; max-width: 560px; width: 100%; max-height: 80vh; overflow-y: auto;
}

.table-scroll { width: 100%; overflow-x: auto; }
table { border-collapse: collapse; width: 100%; min-width: 480px; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--border); font-size: 14px; }

ul#history-list { list-style: none; padding: 0; margin: 0; }
ul#history-list li {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 8px;
  padding: 12px; margin-bottom: 8px; font-size: 14px;
}

@media (max-width: 480px) {
  .card { padding: 24px 20px; }
  .question-card { padding: 16px; }
  main.app-main { padding: 16px 12px 32px; }
}