:root {
  --bg: #f5f5f7;
  --surface: rgba(255, 255, 255, 0.82);
  --surface-strong: rgba(255, 255, 255, 0.94);
  --text: #1d1d1f;
  --muted: #6e6e73;
  --line: rgba(0, 0, 0, 0.08);
  --blue: #0071e3;
  --blue-hover: #0068d1;
  --green: #138a36;
  --green-soft: #e9f9ee;
  --red: #d92d20;
  --red-soft: #fff1f0;
  --soft-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "SF Pro Text", "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background:
    radial-gradient(1200px 600px at 20% -10%, rgba(0, 113, 227, 0.08), transparent 70%),
    radial-gradient(900px 500px at 90% 0%, rgba(10, 132, 255, 0.08), transparent 70%),
    var(--bg);
  color: var(--text);
}

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 28px 16px 44px;
}

.hero h1 {
  margin: 0 0 8px;
  font-size: 34px;
  letter-spacing: -0.02em;
}

.hero p {
  margin: 0 0 20px;
  color: var(--muted);
  max-width: 760px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 18px;
  box-shadow: var(--soft-shadow);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  margin-bottom: 16px;
}

.hidden {
  display: none;
}

.variant-meta {
  margin: 10px 0 8px;
  color: #3a3a3c;
}

.spaced-label {
  display: block;
  margin-top: 12px;
}

.test-topbar,
.progress-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  padding-bottom: 12px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.progress-row {
  align-items: center;
}

.timer-wrap {
  text-align: right;
  min-width: 115px;
}

.muted {
  color: var(--muted);
  margin: 4px 0 0;
}

.question {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 14px;
  margin-bottom: 10px;
  background: var(--surface-strong);
}

.question h3 {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.question small {
  color: var(--muted);
}

.options {
  display: grid;
  gap: 7px;
  margin-top: 10px;
}

.options label {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 9px 11px;
  background: #fff;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.options label:has(input:checked) {
  border-color: rgba(0, 113, 227, 0.45);
  box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.1);
}

.answer-input,
select {
  width: 100%;
  margin-top: 7px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  color: var(--text);
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.answer-input:focus,
select:focus {
  border-color: rgba(0, 113, 227, 0.5);
  box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.12);
}

.feedback {
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: 14px;
  font-size: 14px;
  border: 1px solid transparent;
}

.feedback.ok {
  background: var(--green-soft);
  border-color: rgba(19, 138, 54, 0.24);
  color: var(--green);
}

.feedback.bad {
  background: var(--red-soft);
  border-color: rgba(217, 45, 32, 0.24);
  color: var(--red);
}

.feedback.wait {
  background: #f2f2f7;
  border-color: #e5e5ea;
  color: #636366;
}

.actions {
  display: flex;
  gap: 8px;
  margin-top: 14px;
  flex-wrap: wrap;
}

.btn {
  border: none;
  border-radius: 999px;
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.08s ease, opacity 0.2s ease, background-color 0.2s ease;
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.btn.primary {
  background: var(--blue);
  color: #fff;
}

.btn.primary:hover {
  background: var(--blue-hover);
}

.btn.success {
  background: #1f9c4d;
  color: #fff;
}

.btn.success:hover {
  background: #17833f;
}

.btn.ghost {
  background: #ececf1;
  color: #1d1d1f;
}

.btn.ghost:hover {
  background: #e3e3e8;
}

.ok {
  border-color: rgba(19, 138, 54, 0.3);
  background: var(--green-soft);
}

.bad {
  border-color: rgba(217, 45, 32, 0.3);
  background: var(--red-soft);
}