:root {
  --bg: #f6f8fc;
  --surface: #ffffff;
  --text: #14213d;
  --muted: #44516d;
  --accent: #005f73;
  --accent-hover: #004e5f;
  --border: #d8e0ef;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #eaf4ff 0%, var(--bg) 45%, #eefaf6 100%);
  min-height: 100vh;
}

.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 20px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.topbar h1 {
  margin: 0;
  text-align: center;
  font-size: 1.9rem;
}

.nav-link {
  color: var(--accent);
  font-weight: 700;
  text-decoration: none;
}

.score-box {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
}

.score-box > div {
  text-align: center;
}

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

.score {
  margin: 4px 0 0;
  font-size: 1.7rem;
  font-weight: 800;
}

.choice-row {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.choice,
#resetBtn {
  border: none;
  border-radius: 12px;
  padding: 12px;
  font-size: 1rem;
  font-weight: 700;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}

.choice:hover,
#resetBtn:hover {
  background: var(--accent-hover);
}

.result-box,
.history-box {
  margin-top: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
}

.result-box p {
  margin: 0;
}

.muted {
  color: var(--muted);
  margin-top: 6px;
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.history-header h2 {
  margin: 0;
  font-size: 1.2rem;
}

#historyList {
  margin: 10px 0 0;
  padding-left: 18px;
  color: var(--muted);
}

#historyList li {
  margin-bottom: 6px;
}

@media (max-width: 640px) {
  .topbar h1 {
    font-size: 1.35rem;
  }

  .choice-row,
  .score-box {
    grid-template-columns: 1fr;
  }
}