/* ========================================
   共通
======================================== */

.marathon-calc,
.marathon-calc * {
  box-sizing: border-box;
}

.marathon-calc {
  width: 100%;
  max-width: 900px;
  margin: 30px auto;
}

.br-680 {
  display: none;
}

.br-420 {
  display: none;
}

/* ========================================
   ページタイトル・リード
======================================== */

.marathon-calc__page-title {
  margin: 0 0 18px;
  line-height: 1.5;
}

.marathon-calc__lead {
  margin: 0 0 40px;
  line-height: 1.8;
}


/* ========================================
   共通小見出し
======================================== */

.marathon-calc .marathon-calc__heading {
  margin: 0 0 25px;
  padding: 7px 0 7px 15px;
  font-size: 20px;
  line-height: 1.4;
  font-weight: 700;
  border-left: 4px solid #333;
  border-bottom: 1px solid #ddd;
}


/* ========================================
   フォームカード
======================================== */

.marathon-calc__form-card {
  width: 100%;
  padding: 12px 16px 20px;
  background: #f5f5f5;
  border: 1px solid #ddd;
  border-radius: 8px;
}


/*
 * 画像のようにカードは横幅いっぱい、
 * 入力部分だけ中央へ配置。
 */
.marathon-calc__form-inner {
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
  text-align: left;
}


/* ========================================
   フォーム共通ラベル
======================================== */

.marathon-calc__label,
.marathon-calc__pattern > label {
  display: block;
  margin-bottom: 10px;
  font-size: 16px;
  font-size: 1.6rem;
  line-height: 1.5;
  font-weight: 700;
}

label.marathon-calc__radio span{
  font-size: 14px;
  font-size: 1.4rem;
}

/* ========================================
   計算方法
======================================== */

.marathon-calc__mode {
  margin-bottom: 25px;
}

.marathon-calc__mode-options {
  display: flex;
  align-items: center;

  gap: 28px;
}

.marathon-calc__radio {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  cursor: pointer;
}

.marathon-calc__radio input {
  width: 18px;
  height: 18px;
  margin: 0;
  flex: 0 0 auto;
}

/* ========================================
   入力グループ
======================================== */

.marathon-calc__input-group {
  margin-bottom: 25px;
}

/* ========================================
   完走タイム
======================================== */

.marathon-calc__time {
  display: flex;
  align-items: center;
  gap: 20px;
}

.marathon-calc__time-item {
  display: flex;
  align-items: center;
  gap: 7px;
  min-width: 0;
}

.marathon-calc__time-item select {
  display: block;
  width: 66px;
  height: 44px;
  padding: 5px 10px;
  font-size: 16px;
  background: #fff;
  border: 1px solid #ccc;
  border-radius: 5px;
}

.marathon-calc__time-item span {
  flex: 0 0 auto;
  font-size: 13px;
  font-weight: 700;
}

/* ========================================
  1kmペース
======================================== */

.marathon-calc__pace-input {
  display: flex;
  align-items: center;
  gap: 20px;
}

.marathon-calc__input-note {
  margin: 9px 0 0;
  font-size: 12px;
  line-height: 1.6;

  color: #666;
}


/* ========================================
  ペース配分
======================================== */

.marathon-calc__pattern {
  margin-bottom: 20px;
}

.marathon-calc__pattern select {
  display: block;
  width: calc(100% - 20px);
  height: 44px;
  padding: 5px 12px;
  font-size: 16px;
  background: #fff;
  border: 1px solid #ccc;
  border-radius: 5px;
}

/* ========================================
  計算ボタン
======================================== */

.marathon-calc .marathon-calc__button-area {
  width: 100%;
  margin-top: 20px;
  text-align: center;
}

.marathon-calc .marathon-calc__button {
  display: block;
  width: 220px;
  min-height: 46px;
  margin: 0 auto;
  padding: 10px 20px;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  background: #333;
  border: 0;
  border-radius: 5px;
  cursor: pointer;
}

.marathon-calc .marathon-calc__button:hover {
  opacity: 0.85;
}

.marathon-calc .marathon-calc__button:focus-visible {
  outline: 3px solid #999;
  outline-offset: 2px;
}


/* ========================================
  エラー
======================================== */

.marathon-calc__error {
  margin-top: 15px;
  font-size: 14px;
  font-weight: 700;
  color: #c00;
}


/* ========================================
  結果全体
======================================== */

.marathon-calc__result {
  width: 100%;
  margin-top: 25px;
}


/* ========================================
  計算結果カード
======================================== */

.marathon-summary {
  width: 100%;
  margin-bottom: 20px;
  padding: 12px 16px 20px;
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 8px;
}

/*
 * 画像のように結果一覧を
 * カード中央に配置。
 */
.marathon-summary__inner {
  width: 100%;
  margin: 0 auto;
}

/*
 * 見出しはカード幅を使用するので、
 * dlだけ幅を絞る。
 */
.marathon-summary dl {
  display: grid;
  grid-template-columns:
    minmax(150px, 1fr)
    minmax(150px, 1fr);
  width: 100%;
  max-width: 540px;
  margin: 0 auto;
}

/*
 * ご指定どおり
 *
 * dt → 右揃え
 * dd → 左揃え
 */
.marathon-summary dt,
.marathon-summary dd {
  margin: 0;
  padding: 11px 20px;
  font-weight: 700;
  border-bottom: 1px solid #eee;
}

.marathon-summary dt {
  text-align: right;
}

.marathon-summary dd {
  min-width: 0;
  text-align: left;
  overflow-wrap: anywhere;
}

/* ========================================
  ペース配分説明
======================================== */

.marathon-pattern-info {
  margin-bottom: 22px;
  padding: 20px;
  font-size: 15px;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.8;
  background: #e6ddba;
  border-radius: 6px;
}

.marathon-pattern-info p {
  margin: 0;
  text-align: center;
}

/* ========================================
  グラフ
======================================== */

.marathon-chart {
  width: 100%;
  margin-bottom: 28px;
  padding: 12px 16px 20px;
  border: 1px solid #ddd;
  border-radius: 8px;
  overflow: hidden;
}

.marathon-chart__unit {
  margin: -12px 0 12px 16px;
  font-size: 13px;
  line-height: 1.5;
  color: #666;
}

.marathon-chart__svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.marathon-chart__note {
  margin: 15px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: #666;
}
.marathon-chart__note + p {
  margin: 5px 0 0;
}

.marathon-chart__note::before {
  content: '※'
}

/* ========================================
  SVG
======================================== */

.marathon-chart__grid {
  stroke: #ddd;
  stroke-width: 1;
  stroke-dasharray: 4 4;
}

.marathon-chart__axis {
  stroke: #777;
  stroke-width: 1;
}

.marathon-chart__line {
  fill: none;
  stroke: #1769d2;
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.marathon-chart__point {
  fill: #1769d2;
}

.marathon-chart__label {
  fill: #333;
  font-size: 13px;
}

.marathon-chart__pace-label {
  fill: #1769d2;
  font-size: 13px;
  font-weight: 700;
}

.marathon-chart__fast {
  fill: #1769d2;
  font-size: 12px;
  font-weight: 700;
}

.marathon-chart__slow {
  fill: #b44;

  font-size: 12px;
  font-weight: 700;
}


/* ========================================
  5kmテーブル
======================================== */

.marathon-table-section {
  width: 100%;
}

.marathon-table-wrap {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.marathon-table {
  width: 100%;
  min-width: auto;
  border-collapse: collapse;
  white-space: nowrap;
}

.marathon-table th,
.marathon-table td {
  padding: 10px;
  text-align: center;
  border: 1px solid #ddd;
  vertical-align: middle;
}

.marathon-table thead th {
  font-weight: 700;
  background: #f5f5f5;
}

.marathon-table tbody th {
  font-weight: 700;
}

/* ========================================
  注釈
======================================== */

.marathon-calc__note {
  margin-top: 15px;
  font-size: 13px;
  line-height: 1.8;
  color: #666;
}


/* ========================================
  680px以下
======================================== */

@media screen and (max-width: 680px) {

  .marathon-calc {
    margin: 20px auto;
  }

  .marathon-calc__form-card,
  .marathon-summary,
  .marathon-chart {
    padding-left: 12px;
    padding-right: 12px;
  }

  .marathon-calc__form-inner {
    max-width: none;
  }

  .marathon-calc__mode-options {
    gap: 18px;
  }

  .marathon-calc__time {
    gap: 10px;
  }

  .marathon-calc__time-item {
    gap: 5px;
  }

  .marathon-calc__time-item select {
    width: 62px;
  }

  .marathon-summary dl {
    max-width: 100%;
    grid-template-columns:
      minmax(100px, 1fr)
      minmax(120px, 1fr);
  }

  .marathon-summary dt,
  .marathon-summary dd {
    padding: 10px 12px;
    font-size: 14px;
  }

  .marathon-calc .marathon-calc__heading {
    font-size: 19px;
  }

  .marathon-table {
    font-size: 14px;
    font-size: 1.4rem;
  }

  .marathon-table .br-680 {
    display: block;
  }

}

/* ========================================
  420px以下
======================================== */

@media screen and (max-width: 420px) {
  .marathon-table {
    font-size: 12px;
    font-size: 1.2rem;
  }

  .marathon-table .br-420 {
    display: block;
  }
}

/* ========================================
  380px以下
======================================== */

@media screen and (max-width: 380px) {

  .marathon-calc__mode-options {
    display: grid;
    grid-template-columns: 1fr;
    gap: 9px;
  }

  .marathon-calc__time {
    justify-content: space-between;
    gap: 4px;
  }

  .marathon-calc__time-item {
    gap: 3px;
  }

  .marathon-calc__time-item select {
    width: 55px;
    padding-left: 6px;
    padding-right: 6px;
  }

  .marathon-calc__time-item span {
    font-size: 12px;
  }

  .marathon-calc__pace-input {
    gap: 10px;
  }

  .marathon-summary dl {
    grid-template-columns:
      minmax(90px, 1fr)
      minmax(105px, 1fr);
  }

  .marathon-summary dt,
  .marathon-summary dd {
    padding: 9px 8px;
    font-size: 13px;
  }

  .marathon-calc .marathon-calc__heading {
    font-size: 18px;
  }

  .marathon-table thead th
  .marathon-table thead td {
    padding: 8px;
  }
}


/* ========================================
  参考文献
======================================== */

.marathon-reference {
  width: 100%;
  margin-top: 35px;
}

.marathon-calc__heading {
    margin: 0 0 25px;
    padding: 7px 0 7px 15px;
    font-size: 20px;
    line-height: 1.4;
    font-weight: 700;
    border-left: 4px solid #333;
    border-bottom: 1px solid #ddd;
}

/* 説明 */

.marathon-reference__intro {
  margin: 0 0 18px;
  padding: 15px 18px;

  font-size: 14px;
  line-height: 1.8;

  background: #faf9f5;

  border-radius: 6px;
}


/* リスト */

.marathon-reference__list {
  margin: 0;
  padding: 0;

  list-style: none;

  counter-reset: reference;
}


/* 各文献 */

.marathon-reference__item {
  position: relative;

  margin: 0;
  padding: 18px 18px 18px 48px;

  border-bottom: 1px solid #ddd;

  counter-increment: reference;
}


.marathon-reference__item:first-child {
  border-top: 1px solid #ddd;
}


/* 番号 */

.marathon-reference__item::before {
  content: counter(reference);

  position: absolute;

  top: 18px;
  left: 15px;

  display: flex;

  align-items: center;
  justify-content: center;

  width: 24px;
  height: 24px;

  font-size: 13px;
  font-weight: 700;

  background: #f5f5f5;

  border-radius: 50%;
}


/* 論文タイトル */

.marathon-reference__title {
  margin: 0 0 6px;

  font-size: 15px;
  line-height: 1.6;
  font-weight: 700;
}


/* 著者・掲載誌 */

.marathon-reference__meta {
  margin: 0 0 8px;

  font-size: 13px;
  line-height: 1.6;

  color: #666;
}


/* 内容説明 */

.marathon-reference__desc {
  margin: 0 0 7px;

  font-size: 14px;
  line-height: 1.7;
}


/* DOI */

.marathon-reference__doi {
  margin: 0;

  font-size: 12px;
  line-height: 1.6;

  color: #777;
}


/* ========================================
  SP
======================================== */

@media screen and (max-width: 680px) {

  .marathon-reference {
    margin-top: 30px;
  }


  .marathon-reference__intro {
    padding: 13px 14px;

    font-size: 13px;
  }


  .marathon-reference__item {
    padding:
      15px
      8px
      15px
      38px;
  }


  .marathon-reference__item::before {
    top: 15px;
    left: 5px;
  }


  .marathon-reference__title {
    font-size: 14px;
  }


  .marathon-reference__desc {
    font-size: 13px;
  }

}