@charset "utf-8";

/* =========================
  Base
========================= */

:root{
  --color-main: #1f8f8a;
  --color-main-dark: #146b68;
  --color-main-soft: #e8f6f5;

  --color-bg: #f5f7f7;
  --color-white: #ffffff;
  --color-text: #333333;
  --color-muted: #666666;
  --color-border: #d6e4e3;

  --width-main: 980px;

  --radius-sm: 6px;
  --radius-md: 10px;
}

*,
*::before,
*::after{
  box-sizing: border-box;
}

html{
  -webkit-text-size-adjust: 100%;
}

body{
  margin: 0 0 0 0;
  padding: 0 0 0 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family:
    "Hiragino Kaku Gothic ProN",
    "Yu Gothic",
    "Meiryo",
    sans-serif;
  font-size: 16px;
  line-height: 1.8;
}

img{
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}

a{
  color: var(--color-main-dark);
  text-decoration: underline;
}

a:hover{
  text-decoration: none;
}

p,
ul,
ol,
figure{
  margin-top: 0;
}

p:last-child,
ul:last-child,
ol:last-child,
figure:last-child{
  margin-bottom: 0;
}

/* =========================
  Header
========================= */

.l-header{
  background: var(--color-white);
  border-bottom: 4px solid var(--color-main);
}

.l-header__inner{
  display: flex;
  align-items: center;
  gap: 18px;

  width: min(100%, var(--width-main));
  margin: 0 auto 0 auto;
  padding: 14px 20px 14px 20px;
}

.l-header__logo{
  flex: 0 0 auto;
}

.l-header__logo img{
  display: block;
  width: 100px;
  max-width: 100%;
  height: auto;
}

.l-header__site-name{
  margin: 0 0 0 0;
  color: var(--color-main-dark);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.6;
}


@media screen and (max-width: 900px){

  .l-header__inner{
    display: block;
    padding: 12px 14px 12px 14px;
    text-align: center;
  }

  .l-header__logo img{
    width: 100px;
    margin: 0 auto 6px auto;
  }

  .l-header__site-name{
    font-size: 0.95rem;
    line-height: 1.5;
  }

}


/* =========================
  Layout
========================= */

.l-main{
  width: min(100%, var(--width-main));
  margin: 0 auto 0 auto;
  padding: 24px 20px 48px 20px;
}

/* =========================
  Hero
========================= */

.p-hero{
  margin: 0 0 28px 0;
}

.p-hero__inner{
  padding: 14px 14px 14px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-white);
}

.p-hero__image{
  text-align: center;
}

.p-hero__image img{
  display: block;
  width: 100%;
  max-width: 940px;
  margin: 0 auto 0 auto;
  border-radius: var(--radius-sm);
}

/* =========================
  Section
========================= */

.p-section{
  margin: 34px 0 0 0;
}

.p-section__title{
  margin: 0 0 16px 0;
  padding: 10px 16px 10px 16px;
  border-left: 8px solid var(--color-main-dark);
  border-radius: var(--radius-sm);
  background: var(--color-main);
  color: var(--color-white);
  font-size: 1.55rem;
  line-height: 1.5;
}


/* =========================
  Subsection
========================= */

.p-subsection{
  margin: 24px 0 0 0;
}

.p-subsection__title{
  margin: 0 0 12px 0;
  padding: 8px 12px 8px 12px;
  border-bottom: 2px solid var(--color-main);
  background: var(--color-main-soft);
  color: var(--color-main-dark);
  font-size: 1.25rem;
  line-height: 1.5;
}

/* =========================
  Box
========================= */

.c-box{
  padding: 20px 22px 20px 22px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-white);
}

/* =========================
  Photo Gallery
========================= */

.p-photo-gallery{
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 140px));
  gap: 16px;
  justify-content: center;

  padding: 20px 20px 20px 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-white);
}

.p-photo-gallery__item{
  display: block;
  width: 140px;
  height: 140px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  overflow: hidden;
  text-decoration: none;

  transition:
    opacity 0.2s ease,
    transform 0.2s ease;
}

.p-photo-gallery__item:hover{
  opacity: 0.85;
  transform: translateY(-2px);
}

.p-photo-gallery__item img{
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* SP */
@media screen and (max-width: 900px){

  .p-photo-gallery{
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 16px 14px;
  }

  .p-photo-gallery__item{
    width: 100%;
    height: auto;
    aspect-ratio: 4 / 3;
  }

  .p-photo-gallery__item img{
    width: 100%;
    height: 100%;
    object-fit: cover;
  }

}

/* =========================
  Archive
========================= */

.p-archive-list{
  margin: 0 0 0 0;
  padding: 0 0 0 0;
  list-style: none;
}

.p-archive-list li{
  margin: 0 0 0 0;
  padding: 10px 0 10px 0;
  border-bottom: 1px solid var(--color-border);
}

.p-archive-list li:last-child{
  border-bottom: 0;
}

.p-archive-list a{
  display: inline-block;
  font-weight: 700;
}

/* =========================
  Footer
========================= */

.l-footer{
  background: var(--color-main-dark);
  color: var(--color-white);
}

.l-footer__inner{
  width: min(100%, var(--width-main));
  margin: 0 auto 0 auto;
  padding: 20px 20px 20px 20px;
  text-align: center;
}

.l-footer p{
  margin: 0 0 0 0;
}

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

@media screen and (max-width: 900px){

  body{
    font-size: 15px;
  }

  .l-header__inner{
    padding: 12px 14px 12px 14px;
  }

  .l-main{
    padding: 16px 14px 40px 14px;
  }

  .p-hero{
    margin-bottom: 24px;
  }

  .p-hero__inner{
    padding: 8px 8px 8px 8px;
  }

  .p-section{
    margin-top: 28px;
  }

  .p-section__title{
    padding: 9px 12px 9px 12px;
    font-size: 1.35rem;
  }

  .p-subsection{
    margin-top: 20px;
  }

  .p-subsection__title{
    font-size: 1.12rem;
  }

  .c-box{
    padding: 16px 14px 16px 14px;
  }

  .p-photo-list{
    grid-template-columns: 1fr;
    gap: 12px;
  }

}



/* =========================
  Event Info
========================= */

.c-event-info{
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 22px;
  align-items: start;

  padding: 20px 22px 20px 22px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-white);
}

.c-event-info__image{
  text-align: center;
}

.c-event-info__image img{
  display: block;
  width: 100%;
  max-width: 220px;
  height: auto;
  margin: 0 auto 0 auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.c-event-info__body{
  min-width: 0;
}

/* =========================
  Info List
========================= */

.c-info-list{
  margin: 0 0 0 0;
}

.c-info-list__row{
  display: grid;
  grid-template-columns: 7em 1fr;
  gap: 12px;

  padding: 0 0 14px 0;
  margin: 0 0 14px 0;
  border-bottom: 1px solid var(--color-border);
}

.c-info-list__row:last-child{
  padding: 0 0 0 0;
  margin: 0 0 0 0;
  border-bottom: 0;
}

.c-info-list dt{
  color: var(--color-main-dark);
  font-weight: 700;
}

.c-info-list dd{
  margin: 0 0 0 0;
}

.c-info-list__note{
  color: var(--color-main-dark);
  font-weight: 700;
}

.c-info-list__subnote{
  color: var(--color-muted);
  font-size: 0.95rem;
}

/* =========================
  Entry Link
========================= */

.c-entry-link{
  display: inline-block;
  margin: 0 4px 0 4px;
  padding: 2px 8px 2px 8px;
  border-radius: 4px;
  background: var(--color-main-soft);
  color: var(--color-main-dark);
  font-weight: 700;
  text-decoration: underline;
}

.c-entry-link:hover{
  background: var(--color-main);
  color: var(--color-white);
  text-decoration: none;
}

.c-entry-link__note{
  color: #d60000;
}

/* =========================
  Utility
========================= */

.u-sp-only{
  display: none;
}

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

@media screen and (max-width: 900px){

  .c-event-info{
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 16px 14px 16px 14px;
  }

  .c-event-info__image img{
    max-width: 260px;
  }

  .c-info-list__row{
    grid-template-columns: 1fr;
    gap: 4px;
    padding: 0 0 13px 0;
    margin: 0 0 13px 0;
  }

  .c-info-list dt{
    padding: 0 0 0 0;
  }

  .u-sp-only{
    display: inline;
  }

}


/* =========================
  Badge
========================= */

.c-badge{
  display: inline-block;
  margin: 0 0 8px 0;
  padding: 3px 10px 3px 10px;
  border: 1px solid var(--color-main);
  border-radius: 999px;
  background: var(--color-main-soft);
  color: var(--color-main-dark);

  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1.5;
}


/* =========================
  Intro Box
========================= */

.p-intro-box{
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 24px;
  align-items: stretch;

  margin: 0 0 24px 0;
  padding: 22px 22px 22px 22px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-white);
}

.p-intro-box__body{
  min-width: 0;
  display: flex;
  align-items: center;
}

.p-intro-box .p-section__lead{
  margin: 0 0 0 0;
  color: var(--color-main-dark);
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 2;
}

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

@media screen and (max-width: 900px){

  .p-intro-box{
    grid-template-columns: 1fr;
    gap: 18px;

    margin: 0 0 22px 0;
    padding: 16px 14px 16px 14px;
  }

  .p-intro-box__image img{
    max-width: 360px;
  }

  .p-intro-box .p-section__lead{
    font-size: 1rem;
    line-height: 1.9;
  }

}


/* =========================
  Download Button
========================= */

.c-download-button{
  display: inline-block;
  padding: 7px 14px 7px 14px;
  border: 1px solid var(--color-main);
  border-radius: var(--radius-sm);
  background: var(--color-main-soft);
  color: var(--color-main-dark);

  font-weight: 700;
  line-height: 1.5;
  text-decoration: none;

  transition:
    background-color 0.2s ease,
    color 0.2s ease,
    border-color 0.2s ease;
}

.c-download-button::before{
  content: "PDF";
  display: inline-block;
  margin: 0 8px 0 0;
  padding: 1px 6px 1px 6px;
  border-radius: 3px;
  background: var(--color-main);
  color: var(--color-white);
  font-size: 0.78rem;
  line-height: 1.4;
}

.c-download-button:hover{
  border-color: var(--color-main-dark);
  background: var(--color-main);
  color: var(--color-white);
  text-decoration: none;
}

.c-download-button:hover::before{
  background: var(--color-white);
  color: var(--color-main-dark);
}

@media screen and (max-width: 900px){

  .c-download-button{
    display: block;
    width: 100%;
    text-align: center;
  }

}


/* =========================
  Program List
========================= */

.c-program-list{
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.c-program-list__header,
.c-program-list__row{
  display: grid;
  grid-template-columns: 34% 1fr;
}

.c-program-list__header{
  background: var(--color-main);
  color: var(--color-white);
  font-weight: 700;
}

.c-program-list__header > div{
  padding: 9px 12px 9px 12px;
}

.c-program-list__row{
  background: var(--color-white);
  border-top: 1px solid var(--color-border);
}

.c-program-list__row > div{
  padding: 11px 12px 11px 12px;
}

.c-program-list__speaker{
  color: var(--color-main-dark);
  font-weight: 700;
}

.c-program-list__speaker span{
  display: inline-block;
  margin: 0 0 0 0.8em;
  color: var(--color-text);
  font-size: 0.95rem;
  font-weight: 400;
}

.c-program-list__title{
  font-weight: 500;
}

/* SP */
@media screen and (max-width: 900px){

  .c-program-list{
    border: 0;
    border-radius: 0;
    overflow: visible;
  }

  .c-program-list__header{
    display: none;
  }

  .c-program-list__row{
    display: block;
    margin: 0 0 12px 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    overflow: hidden;
  }

  .c-program-list__row:last-child{
    margin-bottom: 0;
  }

  .c-program-list__row > div{
    padding: 10px 12px 10px 12px;
  }

  .c-program-list__speaker{
    background: var(--color-main-soft);
    border-bottom: 1px solid var(--color-border);
  }

  .c-program-list__speaker::before{
    content: "講演者";
    display: block;
    margin: 0 0 2px 0;
    color: var(--color-main-dark);
    font-size: 0.78rem;
    font-weight: 700;
  }

  .c-program-list__speaker span{
    display: block;
    margin: 2px 0 0 0;
    font-size: 0.9rem;
  }

  .c-program-list__title::before{
    content: "タイトル";
    display: block;
    margin: 0 0 2px 0;
    color: var(--color-main-dark);
    font-size: 0.78rem;
    font-weight: 700;
  }

}



/* =========================
  Archive
========================= */

.p-archive{
  display: grid;
  gap: 16px;
}

.c-archive-card{
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-white);
  overflow: hidden;
}

.c-archive-card__summary{
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;

  padding: 12px 44px 12px 16px;
  background: var(--color-main-soft);
  color: var(--color-main-dark);
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}

.c-archive-card__summary::-webkit-details-marker{
  display: none;
}

.c-archive-card__summary::after{
  content: "＋";
  position: absolute;
  top: 50%;
  right: 16px;
  transform: translateY(-50%);
  font-size: 1.2rem;
  line-height: 1;
}

.c-archive-card[open] .c-archive-card__summary::after{
  content: "－";
}

.c-archive-card__year{
  display: inline-block;
  min-width: 5em;
  font-size: 1.1rem;
}

.c-archive-card__date{
  color: var(--color-text);
  font-size: 0.95rem;
  font-weight: 500;
}

.c-archive-card__content{
  padding: 18px 18px 18px 18px;
}

.c-archive-card__meta{
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 18px;
  align-items: start;

  margin: 0 0 18px 0;
  padding: 0 0 18px 0;
  border-bottom: 1px solid var(--color-border);
}

.c-archive-card__poster{
  text-align: center;
}

.c-archive-card__poster img{
  display: block;
  width: 100%;
  max-width: 150px;
  height: auto;
  margin: 0 auto 0 auto;
  border: 1px solid var(--color-border);
  background: var(--color-white);
}

.c-archive-card__date-text{
  margin: 0 0 12px 0;
  font-weight: 700;
}

.c-archive-card__button-wrap{
  margin: 0 0 0 0;
}

/* =========================
  Archive Program
========================= */

.c-archive-program{
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.c-archive-program__header,
.c-archive-program__row{
  display: grid;
  grid-template-columns: 34% 1fr;
}

.c-archive-program__header{
  background: var(--color-main);
  color: var(--color-white);
  font-weight: 700;
}

.c-archive-program__header > div{
  padding: 8px 12px 8px 12px;
}

.c-archive-program__row{
  border-top: 1px solid var(--color-border);
  background: var(--color-white);
}

.c-archive-program__row > div{
  padding: 10px 12px 10px 12px;
}

.c-archive-program__speaker{
  color: var(--color-main-dark);
  font-weight: 700;
}

.c-archive-program__speaker span{
  display: inline-block;
  margin: 0 0 0 0.6em;
  color: var(--color-text);
  font-size: 0.92rem;
  font-weight: 400;
}

.c-archive-program__title{
  font-weight: 500;
}

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

@media screen and (max-width: 900px){

  .c-archive-card__summary{
    display: block;
    padding: 11px 40px 11px 14px;
  }

  .c-archive-card__year{
    display: block;
    min-width: 0;
  }

  .c-archive-card__date{
    display: block;
    margin: 2px 0 0 0;
  }

  .c-archive-card__content{
    padding: 14px 14px 14px 14px;
  }

  .c-archive-card__meta{
    grid-template-columns: 1fr;
    gap: 12px;
    margin: 0 0 14px 0;
    padding: 0 0 14px 0;
  }

  .c-archive-card__poster img{
    max-width: 180px;
  }

  .c-archive-program{
    border: 0;
    border-radius: 0;
    overflow: visible;
  }

  .c-archive-program__header{
    display: none;
  }

  .c-archive-program__row{
    display: block;
    margin: 0 0 10px 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    overflow: hidden;
  }

  .c-archive-program__row:last-child{
    margin-bottom: 0;
  }

  .c-archive-program__row > div{
    padding: 9px 11px 9px 11px;
  }

  .c-archive-program__speaker{
    background: var(--color-main-soft);
    border-bottom: 1px solid var(--color-border);
  }

  .c-archive-program__speaker span{
    display: block;
    margin: 2px 0 0 0;
  }

  .c-archive-program__speaker::before{
    content: "講演者";
    display: block;
    margin: 0 0 2px 0;
    color: var(--color-main-dark);
    font-size: 0.78rem;
    font-weight: 700;
  }

  .c-archive-program__title::before{
    content: "タイトル";
    display: block;
    margin: 0 0 2px 0;
    color: var(--color-main-dark);
    font-size: 0.78rem;
    font-weight: 700;
  }

}



/* =========================
  Page Top
  PCのみ表示。矢印はCSSで作成
========================= */

html{
  scroll-behavior: smooth;
}

.c-page-top{
  position: fixed;
  right: 28px;
  bottom: 28px;
  z-index: 100;

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

  width: 48px;
  height: 48px;

  border: 1px solid var(--color-main);
  border-radius: 50%;
  background: var(--color-main);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.18);

  text-decoration: none;
  transition:
    background-color 0.2s ease,
    border-color 0.2s ease,
    transform 0.2s ease,
    opacity 0.2s ease;
}

.c-page-top::before{
  content: "";
  width: 13px;
  height: 13px;

  border-top: 3px solid var(--color-white);
  border-left: 3px solid var(--color-white);

  transform: rotate(45deg) translate(2px, 2px);
}

.c-page-top:hover{
  background: var(--color-main-dark);
  border-color: var(--color-main-dark);
  transform: translateY(-3px);
}

/* SPでは非表示 */
@media screen and (max-width: 900px){

  .c-page-top{
    display: none;
  }

}



/* =========================
  Fee With Image
========================= */

.c-fee-with-image{
  display: grid;
  grid-template-columns: 1fr 170px;
  gap: 18px;
  align-items: center;
}

.c-fee-with-image__text{
  min-width: 0;
}

.c-fee-with-image__image{
  text-align: center;
}

.c-fee-with-image__image img{
  display: block;
  width: 100%;
  max-width: 150px;
  height: auto;
  margin: 0 auto;
  border-radius: var(--radius-sm);
  background: var(--color-white);
}

/* SP */
@media screen and (max-width: 900px){

  .c-fee-with-image{
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .c-fee-with-image__image{
    text-align: center;
  }

  .c-fee-with-image__image img{
    max-width: 150px;
    margin: 0 auto;
  }

}


/* =========================
  Lightbox
  写真クリック時に、画面全体へ画像を拡大表示する
========================= */

/* ライトボックス全体
  - 画面全体を覆う黒い半透明レイヤー
  - 初期状態では display: none で非表示
*/
.c-lightbox{
  position: fixed;
  inset: 0;
  z-index: 1000;

  display: none;
  align-items: center;
  justify-content: center;

  padding: 24px;
  background: rgba(0, 0, 0, 0.72);
}

/* JSで .is-active が付いた時だけ表示 */
.c-lightbox.is-active{
  display: flex;
}

/* 拡大画像と閉じるボタンを包む要素
  - position: relative; により、
    閉じるボタンの配置基準になる
  - 画像が大きすぎる場合は画面内に収める
*/
.c-lightbox__inner{
  position: relative;
  max-width: min(100%, 1100px);
  max-height: 90vh;
}

/* 閉じるボタン
  - .c-lightbox__inner を基準に左下へ配置
  - 画像サイズに合わせて、画像の左下付近に表示される
*/
.c-lightbox__close{
  position: absolute;
  left: 10px;
  bottom: 10px;

  width: 40px;
  height: 40px;

  border: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
  cursor: pointer;
}

/* 閉じるボタンの「×」をCSSで作成
  - before と after の2本線を重ねて回転させる
*/
.c-lightbox__close::before,
.c-lightbox__close::after{
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;

  width: 20px;
  height: 2px;
  background: var(--color-main-dark);
}

/* 「×」の1本目 */
.c-lightbox__close::before{
  transform: translate(-50%, -50%) rotate(45deg);
}

/* 「×」の2本目 */
.c-lightbox__close::after{
  transform: translate(-50%, -50%) rotate(-45deg);
}

/* PCでマウスを乗せた時の色 */
.c-lightbox__close:hover{
  background: var(--color-main-soft);
}

/* SP調整
  - 現在はSPではライトボックスを開かず、
    通常リンクで画像を別ウィンドウ表示する想定
  - 念のため、表示された場合も余白を少し狭くする
*/
@media screen and (max-width: 900px){

  .c-lightbox{
    padding: 14px;
  }

}