* { box-sizing: border-box; }
:root {
  --bg: #f4f5fb;
  --card-bg: #ffffff;
  --text: #1b1d29;
  --text-secondary: #6b7280;
  --primary: #4a5fe0;
  --primary-dark: #3a4bc4;
  --primary-soft: #eef0fd;
  --success: #16a34a;
  --success-soft: #ecfdf3;
  --danger: #dc2626;
  --danger-soft: #fef2f2;
  --border: #e3e5ec;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 2px 10px rgba(20,20,43,0.06), 0 1px 2px rgba(20,20,43,0.04);
  --shadow-hover: 0 8px 24px rgba(20,20,43,0.10);
}
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  -webkit-tap-highlight-color: transparent;
}
.wrap {
  max-width: 480px;
  margin: 0 auto;
  padding: 24px 16px calc(80px + env(safe-area-inset-bottom));
}
h1 {
  font-size: 21px;
  font-weight: 700;
  margin: 4px 0 20px;
  letter-spacing: 0.01em;
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
  animation: fadeInUp 0.4s cubic-bezier(0.16,1,0.3,1) both;
}
label {
  display: block;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 6px;
  margin-top: 14px;
  font-weight: 500;
}
input, select, textarea {
  width: 100%;
  padding: 13px 14px;
  font-size: 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: #fafbfc;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--primary);
  background: #fff;
}
button {
  width: 100%;
  padding: 15px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--primary);
  color: #fff;
  margin-top: 18px;
  cursor: pointer;
  transition: transform 0.12s ease, background-color 0.15s ease, box-shadow 0.15s ease;
  box-shadow: 0 2px 8px rgba(74,95,224,0.28);
}
button:hover:not(:disabled) { background: var(--primary-dark); }
button:active:not(:disabled) { transform: scale(0.97); }
button:disabled { background: #c3c9dc; box-shadow: none; cursor: default; }
button.secondary { background: #eef0f3; color: var(--text); box-shadow: none; }
button.secondary:hover:not(:disabled) { background: #e4e6ec; }
.error {
  color: var(--danger);
  font-size: 14px;
  margin-top: 10px;
  min-height: 1em;
}
.msg-ok { color: var(--success); }
.choice {
  display: block;
  padding: 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  margin-top: 8px;
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease, transform 0.1s ease;
  line-height: 1.5;
}
.choice:hover { border-color: #c7cbe6; background: #fafafe; }
.choice:active { transform: scale(0.99); }
.choice.selected { border-color: var(--primary); background: var(--primary-soft); }
@keyframes popIn {
  0% { transform: scale(1); }
  40% { transform: scale(1.015); }
  100% { transform: scale(1); }
}
.choice.correct { border-color: var(--success); background: var(--success-soft); animation: popIn 0.3s ease; }
@keyframes shakeX {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-4px); }
  40% { transform: translateX(4px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(3px); }
}
.choice.wrong { border-color: var(--danger); background: var(--danger-soft); animation: shakeX 0.35s ease; }
.badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary-dark);
  margin-right: 6px;
}
.top-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
}
.top-nav a { color: var(--primary); text-decoration: none; font-size: 14px; font-weight: 600; }
.top-nav a:hover { text-decoration: underline; }
#welcomeMsg { font-size: 14px; color: var(--text-secondary); font-weight: 500; }
.weak-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid #eee;
  gap: 12px;
}
.weak-row:last-child { border-bottom: none; }
.weak-score {
  font-weight: 700;
  color: var(--danger);
  flex-shrink: 0;
}
.menu-btn {
  display: flex;
  align-items: center;
  gap: 14px;
  text-align: left;
  text-decoration: none;
  color: var(--text);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.menu-btn:hover { box-shadow: var(--shadow-hover); border-color: #d6d9ea; transform: translateY(-1px); }
.menu-btn:active { transform: translateY(0) scale(0.99); }
.menu-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--primary-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--primary-dark);
}
.menu-icon svg { width: 22px; height: 22px; }
.spinner {
  width: 26px;
  height: 26px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin: 4px auto;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: var(--text-secondary);
  font-size: 14px;
  padding: 8px 0;
}