:root {
  --black: #111111;
  --white: #ffffff;
  --gray-light: #eeeeee;
  --gray-mid: #bbbbbb;
  --gray-dark: #555555;
  --red: #c62828;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  touch-action: manipulation;
}

body {
  font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", -apple-system, sans-serif;
  background: var(--white);
  color: var(--black);
  line-height: 1.7;
  font-weight: 700;
}

.hidden {
  display: none !important;
}

.screen {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 48px 16px;
}

#screen-start {
  align-items: center;
  position: relative;
}

.credit {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 16px;
  text-align: center;
  font-size: 11px;
  font-weight: 500;
  color: var(--gray-mid);
}

.credit a {
  color: var(--gray-dark);
}

.container {
  width: 100%;
  max-width: 640px;
}

.title {
  font-size: 22px;
  font-weight: 900;
  margin: 0 0 24px 0;
  border-bottom: 2px solid var(--black);
  padding-bottom: 12px;
  text-align: center;
}

/* ---------- 説明ボックス ---------- */
.description-box {
  border: 2px solid var(--black);
  padding: 20px;
  margin: 0 0 28px 0;
}

.description {
  font-size: 14px;
  font-weight: 500;
  color: var(--black);
  margin: 0;
  text-align: left;
}

.description strong {
  font-weight: 900;
}

.description a {
  color: var(--black);
  text-decoration: underline;
  font-weight: 700;
}

/* ---------- 回答入力欄 ---------- */
.answer-inputs {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 4px;
}

.answer-input {
  width: 100%;
  padding: 14px 16px;
  font-size: 16px;
  font-weight: 700;
  font-family: inherit;
  border: 2px solid var(--black);
  border-radius: 0;
  background: var(--white);
  color: var(--black);
  -webkit-appearance: none;
}

.answer-input::placeholder {
  color: var(--gray-mid);
  font-weight: 500;
}

.error-text {
  color: var(--red);
  font-size: 11px;
  font-weight: 700;
  text-align: center;
  margin: 10px 0 0 0;
}

/* ---------- ボタン ---------- */
.btn {
  display: block;
  width: 100%;
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 700;
  font-family: inherit;
  border: 2px solid var(--black);
  border-radius: 0;
  background: var(--white);
  color: var(--black);
  cursor: pointer;
  margin-top: 16px;
  -webkit-tap-highlight-color: transparent;
}

@media (hover: hover) {
  .btn:hover {
    background: var(--gray-light);
  }
}

.btn-primary {
  background: var(--black);
  color: var(--white);
}

@media (hover: hover) {
  .btn-primary:hover {
    background: var(--gray-dark);
  }
}

.btn-secondary {
  background: var(--white);
  color: var(--black);
}

.btn:disabled {
  opacity: 0.5;
  cursor: default;
}

/* ---------- 結果画面 ---------- */
.result-total {
  text-align: center;
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 28px 0;
}

.result-total-num {
  font-size: 56px;
  font-weight: 900;
  margin: 0 6px;
  font-variant-numeric: tabular-nums;
}

.answer-results {
  border-top: 2px solid var(--black);
  padding-top: 8px;
  margin-bottom: 8px;
}

.answer-result-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 14px 4px;
  border-bottom: 1px solid var(--gray-mid);
  font-size: 15px;
}

.answer-result-word {
  font-weight: 700;
  word-break: break-all;
}

.answer-result-score {
  font-weight: 900;
  white-space: nowrap;
}

@media (max-width: 480px) {
  .screen {
    padding: 28px 16px;
  }

  .title {
    font-size: 19px;
    margin-bottom: 18px;
  }

  .description-box {
    padding: 16px;
    margin-bottom: 20px;
  }

  .description {
    font-size: 13px;
  }

  .result-total-num {
    font-size: 44px;
  }
}