:root {
  --bg: linear-gradient(180deg, #f7f4ec 0%, #efe8db 100%);
  --card: #ffffff;
  --text: #222222;
  --muted: #6a6761;
  --accent: #0b6b6f;
  --accent-press: #08585b;
  --danger: #b00020;
  --border: #d8d2c7;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", sans-serif;
  color: var(--text);
  background: var(--bg);
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 20px 16px 28px;
}

h1 {
  margin: 0 0 12px;
  line-height: 1.3;
  font-size: 1.4rem;
}

h2 {
  margin: 0 0 8px;
  font-size: 1.2rem;
}

p {
  margin: 0 0 10px;
}

.lead {
  color: var(--muted);
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  margin: 14px 0;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.05);
}

label {
  display: block;
  margin-bottom: 6px;
  font-weight: 700;
}

input {
  width: 100%;
  font-size: 1rem;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
}

.btn {
  display: block;
  width: 100%;
  text-align: center;
  margin-top: 10px;
  padding: 13px 14px;
  border: 0;
  border-radius: 12px;
  text-decoration: none;
  color: #133;
  background: #e8f0f0;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
}

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

.btn.primary:active {
  background: var(--accent-press);
}

.note {
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.45;
}

.note.small {
  font-size: 0.85rem;
}

.error {
  min-height: 1.2em;
  color: var(--danger);
  font-size: 0.9rem;
}

.big {
  font-size: 1.5rem;
  font-weight: 700;
}

.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

#progress {
  margin: 0;
  font-weight: 700;
}

.timer {
  margin: 0;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 999px;
  width: 64px;
  text-align: center;
  padding: 8px 0;
  font-weight: 700;
}

.choices {
  display: grid;
  gap: 10px;
  margin-top: 16px;
}

.choice-btn {
  text-align: left;
  font-size: 1rem;
  line-height: 1.45;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
  color: #1f1f1f;
}

.choice-btn:active {
  background: #f1f8f8;
}

@media (min-width: 768px) {
  .container {
    padding-top: 28px;
  }

  .btn {
    max-width: 360px;
  }
}