/* ==================================================================
   ナノ学会 第25回大会 公式サイト
   白＋淡いブルー主体／濃紺を文字・見出し／金は細いアクセント
   詳細情報は「サブタイトル→改行して本文」の縦型レイアウト
   ================================================================== */
:root{
  --navy:#173b62;
  --navy-dark:#102d4d;
  --navy-light:#2f6f9f;
  --accent:#c6a04a;
  --accent-dark:#7a5d1c;
  --accent-soft:#fbf5e6;
  --blue-pale:#e4f2fa;
  --blue-soft:#eef6fb;
  --blue-line:#cfe4f1;
  --bg-soft:#f5f8fa;
  --border:#dce7ee;
  --text:#172a3a;
  --muted:#465d70;
  --shadow:0 6px 20px rgba(23,59,98,.08);
}
*{
  box-sizing:border-box;
  margin:0;
  padding:0
}

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

body {
  font-family:
    "Noto Sans JP",
    "Hiragino Sans",
    "Meiryo",
    "Yu Gothic",
    sans-serif;
  color: var(--text);
  line-height: 1.8;
  background: #eaf2f7;
  font-size: 16px;
}
a
{color:#0b568a;text-decoration:none;transition:background-color .15s,color .15s,opacity .15s,transform .15s}
a:hover{color:var(--navy);text-decoration:underline}
a:focus-visible{outline:3px solid rgba(198,160,74,.65);outline-offset:3px}
img{max-width:100%;height:auto}
strong{color:var(--navy-dark)}
.skip{position:absolute;left:-9999px;top:auto}
.skip:focus{left:12px;top:12px;z-index:999;background:#fff;padding:8px 14px;border:2px solid var(--navy);border-radius:4px}

/* Header */
header.top
{background:#fff;
  color:var(--navy);
  border-bottom:2px solid var(--blue-line)
}
header.top .inner
{max-width:1080px;
  margin:0 auto;
  padding:28px 20px 22px;
  text-align: left;
}


header.top .en
{
  font-size:15.5px;
  letter-spacing:.09em;
  color:#3f5f79;
  font-weight:500;
  line-height:1.6
}
header.top h1
{
  font-size:40px;
  margin:4px 0 2px;
  letter-spacing:.03em;
  line-height:1.2;
  color:var(--navy-dark)
}

@media(max-width:720px){
  header.top .inner{flex-direction:column;text-align:center;gap:9px;padding:18px 14px}
  header.top h1{font-size:23px}
  header.top .en{font-size:12px;letter-spacing:.06em}
}

/* Main nav */
nav.main-nav
{
  background:#fff;
  position:sticky;
  top:0;
  z-index:100;
  border-bottom:2px solid var(--blue-line);
  box-shadow:0 3px 12px rgba(23,59,98,.06)
}

nav.main-nav ul
{
  display:flex;
  flex-wrap:wrap;
  list-style:none;
  max-width:1080px;
  margin:0 auto;
  padding:0 4px;
}

nav.main-nav a
{
  display:block;
  padding:13px 18px;
  text-align:center;
  color:var(--navy);
  font-weight:700;
  font-size:15px;
  white-space:nowrap;
  border-bottom:2px solid transparent
}
nav.main-nav a:hover
{
  background:var(--blue-pale);
  text-decoration:none;
  color:var(--navy)
}
nav.main-nav a.active
{
  background:var(--navy);
  color:#fff;
  border-bottom-color:var(--navy)
}

@media(max-width:760px){
  nav.main-nav{position:static}
  nav.main-nav ul{overflow-x:auto;flex-wrap:nowrap;padding:0}
  nav.main-nav a{padding:12px 14px;font-size:12px}
}

/* Main */
main
  {max-width:1080px;
    margin:0 auto;
    padding:34px 20px 74px
  }


h2
  {
    font-size:22px;
    color:var(--navy);
    border-left:5px solid var(--accent);
    padding:2px 0 8px 12px;
    margin-bottom:14px;
    letter-spacing:.015em;
    line-height: 1.5;
  }
@media(max-width:760px)
{
  h2
  {
    font-size:18px;
  }
}
h3
  {
    font-size:18px;
    color:var(--navy);
    margin:18px 0 9px;
    line-height:1.55;
  }
p{margin:6px 0}

/* Speaker cards */
.speaker-list
{
  display:grid;
  grid-template-columns:1fr;gap:16px;
  margin-top:16px
}
.speaker-card
{
  background:#fff;
  border:1px solid var(--border);
  border-top:3px solid var(--blue-line);
  border-radius:9px;
  padding:18px 20px;
  box-shadow:0 3px 12px rgba(23,59,98,.05)
}
.speaker-card h3{margin:0 0 10px}
.speaker-card p{margin:5px 0}


/* Sponsor banners */
.sponsor-banner-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin-top:16px}
.sponsor-banner{min-height:96px;display:flex;align-items:center;justify-content:center;padding:14px;background:#fff;border:1px solid var(--border);border-radius:9px;box-shadow:0 3px 12px rgba(23,59,98,.05);transition:transform .15s,box-shadow .15s,border-color .15s}
.sponsor-banner:hover{opacity:1;text-decoration:none;transform:translateY(-2px);border-color:var(--blue-line);box-shadow:0 7px 18px rgba(23,59,98,.10)}
.sponsor-banner img{display:block;max-width:100%;max-height:68px;width:auto;height:auto;object-fit:contain}
.sponsor-banner-empty{grid-column:1/-1;padding:20px;text-align:center;color:var(--text);font-size:15.5px;background:var(--blue-soft);border:1px dashed var(--blue-line);border-radius:9px}
@media(max-width:900px){.sponsor-banner-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:680px){.sponsor-banner-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:420px){.sponsor-banner-grid{grid-template-columns:1fr}}

/* PDF/doc buttons */

.text-button
{
  display:inline-block;
  background:var(--navy);
  color:#fff!important;
  font-weight:700;
  font-size:15px;
  padding:10px 18px;
  border-radius:6px;
  text-decoration:none;
  box-shadow:0 2px 7px rgba(23,59,98,.10)
}
.text-button:hover
{
  background:var(--navy-dark);
  opacity:1;
  text-decoration:none;
  transform:translateY(-1px)
}
.document-links
{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin:16px 0
}
.doc-link
{
  display:inline-block;
  padding:9px 13px;
  border:1px solid var(--blue-line);
  border-radius:6px;
  background:#fff;
  font-size:14px
}
.doc-link.disabled
{
  color:#596570;
  background:var(--bg-soft)
}

/* Notes */
.note
{
  background:var(--accent-soft);
  border:1px solid #ead9ac;padding:12px 16px;
  font-size:14.5px;line-height:1.8;
  border-radius:7px;margin:12px 0
}
.note.red
{
  background:#fdf2f1;
  border-color:#ecc9c4
}

/* Footer */
footer
{
  background:var(--navy-dark);
  color:#fff;
  text-align:center;
  padding:24px 14px;
  font-size:14px;
  line-height:1.75
}
footer a
{
  color:#fff;
  text-decoration:none;
}
footer a:hover {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 2px;
}
footer p {
  margin: 2px 0;
  line-height: 1.5;
}
footer .links{margin-bottom:8px}
footer .links a
{
  display:inline-block;
  margin:0 8px
}

/* 404 */
.nf404{text-align:center;padding:80px 20px}
.nf404 h1{font-size:64px;color:var(--navy)}
.nf404 p{margin:12px 0}

@media(max-width:480px){
  body{font-size:15.5px}
  header.top .sub{font-size:15px}
  header.top .meta{font-size:13.5px}
  .sec-sub{font-size:14px}
  ul.news li{font-size:15px}
}
@media print{
  nav,footer,.hero{display:none!important}
  body{font-size:12px}
  main{padding:0}
  .soft-section,#news{background:#fff;border:1px solid #ccc}
}


/* ===== Simplified information layout ===== */
.summary-list{margin:14px 0 18px;padding-left:1.35em;line-height:1.9;font-size:16px;color:var(--text)}
.summary-list li{margin:8px 0}

/* ==================================================================
   2026-08-25 視認性調整：白を減らし、淡青の面でセクションを明確化
   目安：白 55% / 淡青 25% / 濃紺 15% / 金 5%
   ================================================================== */

/* トップページのメインビジュアルも白一色にせず、淡青で面を作る */
.hero-light
{
    
  margin-bottom: 20px;
  padding: 30px 36px;
  min-height: 320px;

  border: 0px solid #172a3a;
  border-radius: 10px;
  overflow: hidden;

  background:
    linear-gradient(
      to right,
      #07121f 0%,
      #07121f 10%,
      rgba(7,18,31,0.95) 35%,
      rgba(7,18,31,0.20) 75%,
      transparent 100%
    ),
    url("images/kandai-stone1.jpg");
      
    background-size: auto, 120% auto;
  background-position: right,16% 35%;
  background-repeat: no-repeat;


  box-shadow:0 4px 16px rgba(23,59,98,.12);
}
.hero-light h2
{
  margin:0 0 10px;
  padding:0;
  border:0;
  color:var(#ffff);
  font-size:30px;
}
.hero-light .hero-subtitle
{
  display:inline-block;
  margin:8px 0 7px;
  padding-left:11px;
  border-left:3px solid var(--accent);
  color:var(#ffff);
  font-size:22px;
  font-weight:700;
}

.hero-light dl {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  column-gap: 16px;
  row-gap: 12px;
  width:100%;
  margin-top: 8px;
  font-size:18px;
}

.hero-light dd {
  margin: 0;
  min-width: 0;
}

/* 各ページの大項目をカード化し、1つおきに淡青の面を配置 */
main > section:not(.hero-light)
{
  margin-bottom:24px;
  padding:28px 30px;
  border:1px solid #cfdde6;
  border-top: 3.5px solid #b9d9ea;
  border-radius:10px;
  background:#fff;
  box-shadow:0 4px 14px rgba(23,59,98,.045);
}

main > section:not(.hero-light) h2
{  
  border-bottom:2px solid #cadae2;
}


#important-dates .summary-list, #dates .summary-list
{
  list-style: none;
  padding-left: 0;
}

#important-dates .summary-list li, #dates .summary-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(200px, 40%);
  column-gap: 20px;
  margin: 0;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}

#important-dates .summary-list span {
  min-width: 0;
}

@media (max-width: 720px) {
  #important-dates .summary-list li,
  #dates .summary-list li {
    grid-template-columns: 1fr;
    row-gap: 4px;
  }
}




/* スマートフォンでは余白を詰めつつ、淡青の区切りは維持 */
@media(max-width:720px){
  main{padding:24px 12px 56px}
  .hero-light{padding:27px 20px;margin-bottom:22px}
  .hero-light h2{font-size:24px}
  .hero-light .hero-subtitle{font-size:18px}
  main > section:not(.hero-light){
    margin-bottom:20px;
    padding:21px 18px 23px;
    border-radius:10px;
  }
}
@media(max-width:600px) {
  .hero-light dl {
    grid-template-columns: 90px minmax(0, 1fr);
    width: 100%;
    column-gap: 12px;
  }

  .hero-light dd {
    margin-bottom: 12px;
    overflow-wrap: anywhere;
   
  }

  .hero-light dd:last-child {
    margin-bottom: 0;
  }

}


@media print{
  body{background:#fff}
  .hero-light,
  main > section:not(.hero-light),
  main > section:not(.hero-light):nth-of-type(even){
    background:#fff!important;
    box-shadow:none!important;
  }
}
.committee-members {
  line-height: 1.5;
}


/* ==================================================================
   2026-08-26 可読性調整：枠内は白地に統一／暫定公開版を明示
   ================================================================== */
.provisional-line{margin-top:8px}
.provisional-badge{
  display:inline-block;
  padding:5px 12px;
  border:1px solid var(--accent);
  border-radius:999px;
  background:var(--navy);
  color:#fff;
  font-size:13px;
  font-weight:800;
  letter-spacing:.08em;
  line-height:1.4;
}

/* ページ背景は淡青、情報を載せる枠内は白地に統一 */

main > section:not(.hero-light),
main > section:not(.hero-light):nth-of-type(even),
.soft-section,
#news,
.detail-item h3,
.pdf-box,
.supporter-list,
.map-placeholder,
.note.blue,
.sponsor-banner-empty{
  background:#fff;
}

/* 白地でも項目の境界が分かるよう、線と見出しで階層を出す */

.detail-item h3{
  border:1px solid #dbe8ef;
  border-left:4px solid var(--navy-light);
}
.pdf-box,.supporter-list,.map-placeholder,.note.blue,.sponsor-banner-empty{
  border-color:#d5e3eb;
}

@media(max-width:720px){
  .provisional-line{margin-top:7px}
  .provisional-badge{font-size:12.5px;padding:5px 11px}
}
.status-preparing {
  color: #667789;
}

.news-list time {
  display: inline-block;
  margin-right: 12px;
  color: var(--navy);
  font-weight: 600;
}

.hero-light h2,
.hero-light .hero-subtitle,
.hero-light dt,
.hero-light dd,
.hero-light strong {
        color: #ffff
}
.hero-light .status-preparing {
  color: #d1d5db;
}

.hero-light .hero-subtitle {
  border-left-color: #f1ac09;
}

.hero-light dl {
  max-width: 58%;
}
/* スマートフォン版 */
@media (max-width: 600px) {

  .hero-light {
    background: #000;
  }

  .hero-light dl {
    max-width: 100%;
    grid-template-columns: 90px minmax(0, 1fr);
    column-gap: 12px;
  }

  .hero-light dd {
    overflow-wrap: normal;
    word-break: normal;
  }
}