@font-face {
  font-family: "SeptemberN";
  src: url("fonts/september-n.ttf") format("truetype");
  font-display: swap;
}

#gkt-calendar-app {
  width: min(100%, 1080px);
  min-width: 0;
  margin: 28px auto;
  padding: clamp(10px, 1.8vw, 22px);
  box-sizing: border-box;
  color: #fff;
  background: transparent;
  font-family: "M PLUS Rounded 1c", sans-serif;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.gkt-cal-months {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 46px);
}

.gkt-cal-two-months {
  grid-template-columns: 1fr;
}

.gkt-cal-month {
  width: 100%;
  min-width: 0;
}

/* ヘッダー */
.gkt-cal-header {
  display: grid;
  grid-template-columns: auto minmax(260px, 1fr) auto;
  align-items: center;
  gap: clamp(8px, 1.2vw, 16px);
  margin-bottom: clamp(8px, 1vw, 12px);
}

.gkt-cal-title-wrap {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.4vw, 18px);
  min-width: 0;
}

.gkt-cal-title-icon {
  width: clamp(48px, 7vw, 82px);
  height: clamp(48px, 7vw, 82px);
  object-fit: contain;
  flex: 0 0 auto;
}

.gkt-cal-title {
  margin: 0;
  font-family: "SeptemberN", sans-serif;
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  line-height: 1;
  font-weight: 400;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.gkt-cal-year {
  font-family: "SeptemberN", sans-serif;
  font-size: clamp(2.1rem, 5vw, 4rem);
  line-height: 1;
  font-weight: 400;
  white-space: nowrap;
}

.gkt-cal-message {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 6px;
  max-width: 360px;
  padding: 5px 12px;
  border: 2px solid #fff;
  border-radius: 12px;
  box-sizing: border-box;
}

.gkt-cal-message img {
  width: 34px;
  height: 34px;
  object-fit: contain;
  flex: 0 0 auto;
}

.gkt-cal-message p {
  margin: 0;
  font-size: 0.72rem;
  line-height: 1.22;
  font-weight: 700;
}

/* 曜日 */
.gkt-cal-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  border-top: 2px solid #fff;
  border-left: 2px solid #fff;
}

.gkt-cal-weekday {
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-right: 2px solid #fff;
  border-bottom: 2px solid #fff;
  box-sizing: border-box;
  font-family: "M PLUS Rounded 1c", sans-serif;
  font-size: 1.75rem;
  line-height: 1;
  font-weight: 500;
}

/* 週 */
.gkt-cal-week {
  position: relative;
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  border-left: 2px solid #fff;
}

/* セル */
.gkt-cal-day {
  position: relative;
  aspect-ratio: 1 / 1.18;
  border-right: 2px solid #fff;
  border-bottom: 2px solid #fff;
  box-sizing: border-box;
  overflow: visible;
}

/* 日付 */
.gkt-cal-day-number {
  position: absolute;
  top: 0;
  right: 0;
  min-width: 40px;
  height: 40px;
  padding: 0 5px;
  box-sizing: border-box;
  border-left: 2px solid #fff;
  border-bottom: 2px solid #fff;
  box-shadow: 2px 0 0 0 #fff;
  font-family: "Noto Sans JP", sans-serif;
  font-size: 1.55rem;
  line-height: 1.08;
  font-weight: 500;
  text-align: center;
  z-index: 20;
}

/* イベント枠 */
.gkt-cal-event {
  position: absolute;
  inset: 0;
  text-align: center;
  font-weight: 700;
}

/* 本文エリア */
.gkt-cal-main {
  position: absolute;
  top: 42px;
  left: 3px;
  right: 3px;
  bottom: 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 0 3px;
  box-sizing: border-box;
  z-index: 2;
  text-align: center;
}

/* セル内テキスト */
.gkt-cal-time,
.gkt-cal-name,
.gkt-cal-campus-title,
.gkt-cal-event-title,
.gkt-cal-place,
.gkt-cal-note {
  font-family: "SeptemberN", "M PLUS Rounded 1c", sans-serif;
  line-height: 1.18;
  font-weight: 700;
  word-break: keep-all;
  overflow-wrap: normal;
  text-align: center;
}

.gkt-cal-time,
.gkt-cal-name,
.gkt-cal-campus-title,
.gkt-cal-place,
.gkt-cal-note {
  white-space: nowrap;
}

.gkt-cal-time,
.gkt-cal-name,
.gkt-cal-campus-title {
  font-size: clamp(0.76rem, 1.35vw, 1.12rem);
}

.gkt-cal-note {
  font-size: clamp(0.52rem, 0.95vw, 0.82rem);
  line-height: 1.15;
}

.gkt-cal-special-event .gkt-cal-event-title,
.gkt-cal-special-event .gkt-cal-place {
  white-space: normal;
  font-size: clamp(0.62rem, 1.12vw, 0.95rem);
  line-height: 1.15;
}

.gkt-cal-special-event .gkt-cal-note {
  white-space: nowrap;
  font-size: clamp(0.58rem, 1.08vw, 0.9rem);
  line-height: 1.15;
}

/* アイコン */
.gkt-cal-icons {
  position: absolute;
  right: 4px;
  bottom: -2px;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  gap: 2px;
  z-index: 3;
}

.gkt-cal-icons img {
  width: clamp(1.1rem, 2.6vw, 2rem);
  height: clamp(1.1rem, 2.6vw, 2rem);
  object-fit: contain;
}

/* 複数日セル結合 */
.gkt-cal-span-event {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 4;
  background: #ff8c00;
  border-right: 2px solid #fff;
  border-bottom: 2px solid #fff;
  box-sizing: border-box;
}

.gkt-cal-span-event .gkt-cal-event {
  inset: 0;
}

.gkt-cal-span-event .gkt-cal-main {
  top: 44px;
  bottom: 34px;
  left: 8px;
  right: 8px;
  padding: 0;
}

.gkt-cal-span-event .gkt-cal-event-title,
.gkt-cal-span-event .gkt-cal-place {
  font-size: clamp(0.7rem, 1.25vw, 1rem);
  white-space: normal;
}

.gkt-cal-span-event .gkt-cal-note {
  font-size: clamp(0.62rem, 1.12vw, 0.92rem);
  white-space: nowrap;
}

.gkt-cal-outside {
  opacity: 0.96;
}

/* アイコン説明 */
.gkt-cal-legend {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 34px;
  margin: 14px 6px 0;
  padding: 9px 14px;
  border: 2px solid #fff;
  border-radius: 14px;
  font-family: "M PLUS Rounded 1c", sans-serif;
  font-size: 0.9rem;
  line-height: 1;
  font-weight: 700;
}

.gkt-cal-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0;
  white-space: nowrap;
}

.gkt-cal-legend-item img {
  width: 30px;
  height: 30px;
  object-fit: contain;
  display: block;
  margin-right: 2px;
}

.gkt-cal-legend-item span {
  display: inline-block;
  line-height: 1;
  margin-left: 2px;
}

.gkt-cal-error {
  padding: 20px;
  text-align: center;
  font-weight: 700;
}

/* =========================================================
   タブレット・スマホ
   横スクロールを使わず、7列すべてを画面内に表示
========================================================= */

@media (max-width: 900px) {
  #gkt-calendar-app {
    width: 100%;
    min-width: 0;
    max-width: 100%;
    margin: 18px auto;
    padding: clamp(6px, 1.5vw, 12px);
    overflow-x: visible;
  }

  .gkt-cal-months,
  .gkt-cal-month,
  .gkt-cal-weekdays,
  .gkt-cal-week,
  .gkt-cal-legend {
    width: 100%;
    min-width: 0;
    max-width: 100%;
    box-sizing: border-box;
  }

  .gkt-cal-header {
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: clamp(5px, 1vw, 10px);
  }

  .gkt-cal-title-wrap {
    gap: clamp(5px, 1vw, 10px);
  }

  .gkt-cal-title-icon {
    width: clamp(34px, 7vw, 58px);
    height: clamp(34px, 7vw, 58px);
  }

  .gkt-cal-title {
    font-size: clamp(1.75rem, 6vw, 3.2rem);
    letter-spacing: 0.03em;
  }

  .gkt-cal-year {
    font-size: clamp(1.45rem, 4.8vw, 2.7rem);
  }

  .gkt-cal-message {
    max-width: min(290px, 100%);
    padding: 4px 8px;
    gap: 4px;
  }

  .gkt-cal-message img {
    width: clamp(22px, 4vw, 30px);
    height: clamp(22px, 4vw, 30px);
  }

  .gkt-cal-message p {
    font-size: clamp(0.46rem, 1.25vw, 0.65rem);
    line-height: 1.16;
  }

  .gkt-cal-weekday {
    height: clamp(34px, 7vw, 50px);
    font-size: clamp(0.92rem, 3vw, 1.45rem);
  }

  .gkt-cal-day {
    min-width: 0;
    aspect-ratio: 1 / 1.28;
    overflow: hidden;
  }

  .gkt-cal-day-number {
    min-width: clamp(24px, 5.2vw, 34px);
    height: clamp(24px, 5.2vw, 34px);
    padding: 0 3px;
    font-size: clamp(0.82rem, 3.1vw, 1.25rem);
  }

  .gkt-cal-main {
    top: clamp(26px, 5.7vw, 36px);
    left: 1px;
    right: 1px;
    bottom: clamp(18px, 4vw, 28px);
    gap: 2px;
    padding: 0 1px;
  }

  .gkt-cal-time,
  .gkt-cal-name,
  .gkt-cal-campus-title {
    font-size: clamp(0.46rem, 1.7vw, 0.82rem);
    line-height: 1.12;
  }

  .gkt-cal-note {
    font-size: clamp(0.38rem, 1.35vw, 0.68rem);
    line-height: 1.1;
  }

  .gkt-cal-special-event .gkt-cal-event-title,
  .gkt-cal-special-event .gkt-cal-place {
    font-size: clamp(0.4rem, 1.45vw, 0.72rem);
    line-height: 1.08;
  }

  .gkt-cal-special-event .gkt-cal-note,
  .gkt-cal-span-event .gkt-cal-note {
    font-size: clamp(0.36rem, 1.25vw, 0.64rem);
  }

  .gkt-cal-icons {
    right: 1px;
    bottom: -1px;
    gap: 1px;
  }

  .gkt-cal-icons img {
    width: clamp(0.72rem, 3vw, 1.35rem);
    height: clamp(0.72rem, 3vw, 1.35rem);
  }

  .gkt-cal-span-event .gkt-cal-main {
    top: clamp(26px, 5.7vw, 36px);
    bottom: clamp(18px, 4vw, 28px);
    left: 3px;
    right: 3px;
  }

  .gkt-cal-legend {
    gap: 9px 20px;
    margin: 10px 2px 0;
    padding: 7px 8px;
    font-size: clamp(0.58rem, 1.8vw, 0.8rem);
  }

  .gkt-cal-legend-item img {
    width: clamp(20px, 4vw, 27px);
    height: clamp(20px, 4vw, 27px);
  }
}

@media (max-width: 560px) {
  #gkt-calendar-app {
    width: 100%;
    min-width: 0;
    margin: 12px auto;
    padding: 5px 4px 14px;
  }

  .gkt-cal-months {
    gap: 28px;
  }

  .gkt-cal-header {
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
      "title year"
      "message message";
    gap: 6px 8px;
    margin-bottom: 7px;
  }

  .gkt-cal-title-wrap {
    grid-area: title;
    justify-self: start;
  }

  .gkt-cal-title-icon {
    width: clamp(30px, 9vw, 42px);
    height: clamp(30px, 9vw, 42px);
  }

  .gkt-cal-title {
    font-size: clamp(1.65rem, 8.2vw, 2.65rem);
  }

  .gkt-cal-year {
    grid-area: year;
    justify-self: end;
    font-size: clamp(1.25rem, 5.8vw, 1.9rem);
  }

  .gkt-cal-message {
    grid-area: message;
    justify-self: stretch;
    width: 100%;
    max-width: none;
    min-height: 0;
    padding: 3px 7px;
    border-width: 1.5px;
    border-radius: 9px;
  }

  .gkt-cal-message img {
    width: 21px;
    height: 21px;
  }

  .gkt-cal-message p {
    font-size: clamp(0.42rem, 2vw, 0.58rem);
    line-height: 1.1;
  }

  .gkt-cal-weekdays,
  .gkt-cal-week {
    border-left-width: 1.5px;
  }

  .gkt-cal-weekday,
  .gkt-cal-day {
    border-right-width: 1.5px;
    border-bottom-width: 1.5px;
  }

  .gkt-cal-weekdays {
    border-top-width: 1.5px;
  }

  .gkt-cal-weekday {
    height: clamp(29px, 8vw, 38px);
    font-size: clamp(0.72rem, 3.6vw, 1rem);
  }

  .gkt-cal-day {
    aspect-ratio: 1 / 1.45;
  }

  .gkt-cal-day-number {
    min-width: clamp(21px, 6.5vw, 29px);
    height: clamp(21px, 6.5vw, 29px);
    border-left-width: 1.5px;
    border-bottom-width: 1.5px;
    box-shadow: 1.5px 0 0 0 #fff;
    font-size: clamp(0.7rem, 4vw, 1rem);
  }

  .gkt-cal-main {
    top: clamp(23px, 7vw, 31px);
    left: 0;
    right: 0;
    bottom: clamp(14px, 4.8vw, 21px);
    gap: 1px;
    padding: 0;
  }

  .gkt-cal-time,
  .gkt-cal-name,
  .gkt-cal-campus-title {
    font-size: clamp(0.36rem, 1.78vw, 0.55rem);
    line-height: 1.08;
    letter-spacing: -0.01em;
  }

  .gkt-cal-note {
    font-size: clamp(0.3rem, 1.4vw, 0.44rem);
    line-height: 1.04;
    letter-spacing: -0.02em;
  }

  .gkt-cal-special-event .gkt-cal-event-title,
  .gkt-cal-special-event .gkt-cal-place {
    font-size: clamp(0.31rem, 1.5vw, 0.47rem);
    line-height: 1.04;
  }

  .gkt-cal-special-event .gkt-cal-note,
  .gkt-cal-span-event .gkt-cal-note {
    font-size: clamp(0.28rem, 1.3vw, 0.41rem);
  }

  .gkt-cal-icons img {
    width: clamp(0.58rem, 3.6vw, 0.92rem);
    height: clamp(0.58rem, 3.6vw, 0.92rem);
  }

  .gkt-cal-span-event {
    border-right-width: 1.5px;
    border-bottom-width: 1.5px;
  }

  .gkt-cal-span-event .gkt-cal-main {
    top: clamp(23px, 7vw, 31px);
    bottom: clamp(14px, 4.8vw, 21px);
    left: 1px;
    right: 1px;
  }

  .gkt-cal-legend {
    gap: 7px 12px;
    margin: 8px 1px 0;
    padding: 6px 5px;
    border-width: 1.5px;
    border-radius: 10px;
    font-size: clamp(0.5rem, 2.25vw, 0.66rem);
  }

  .gkt-cal-legend-item img {
    width: clamp(17px, 5vw, 22px);
    height: clamp(17px, 5vw, 22px);
    margin-right: 1px;
  }

  .gkt-cal-legend-item span {
    margin-left: 1px;
  }
}