:root {
  --blue:#2563eb;
  --red:#e11d48;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
a{
	color:#007bff;
	text-decoration:none;
}
a:hover {
  text-decoration:underline;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header{
	position:sticky;top:0;
	z-index:20;
	background:rgba(255,255,255,.8);
	backdrop-filter:blur(8px);
	border-bottom:1px solid var(--line);
}
.nav{
	display:flex;
	align-items:center;
	justify-content:space-between;
	height:64px;
}
.logo{font-weight:800;}

.btn{
	display:inline-block;
	padding:12px 16px;
	border-radius:12px;
	background:linear-gradient(90deg,var(--blue),var(--red));
	color:#fff;
	font-weight:700;
}

/* hero section */
.hero{
	position:relative;
	width:100%;
	height:480px;background:url('../images/hero.jpg') center/cover no-repeat;
	display:flex;
	align-items:center;
	justify-content:flex-start;
	text-align:left;
	color:#fff;
}

.hero::after{
	content:'';
	position:absolute;
	inset:0;background:rgba(0,0,0,0.25);
}

.hero .content{
	position:relative;
	z-index:2;
	max-width:800px;
	padding:0 40px;
}
.hero h1{
	font-size:clamp(28px,4vw,44px);
	line-height:1.2;margin:0 0 12px;
}
.hero p{
	font-size:18px;margin:0;
}

/* Header Section 
.header {
    margin-bottom: 80px;
    width: 100%;
}

.header-image {
    width: 100%;
    overflow: hidden;
}

.header-image img {
    width: 100%;
    height: auto;
    display: block;
}*/

/* Key Information Section */
.key-info {
    padding: 60px 20px;
    margin-bottom: 80px;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
    max-width: 1200px;
    margin: 0 auto;
}

.info-card {
    background: white;
    padding: 25px 20px;
    border-radius: 8px;
    text-align: center;
    border: 2px solid #e5e7eb;
    transition: border-color 0.3s ease;
}

.info-card:hover {
    border-color: #dc2626;
}

.icon-wrapper {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    background: #1e40af;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-wrapper i {
    font-size: 1.5rem;
    color: white;
}

.info-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: #dc2626;
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-detail {
    font-size: 1.1rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 6px;
}

.info-subdetail {
    font-size: 0.9rem;
    color: #666;
}

/* Conference Outline Section */
#outline {
    padding: 80px 20px;
    background: white;
    margin-bottom: 80px;
}

.outline-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    max-width: 800px;
    margin: 0 auto;
}

.outline-item {
    padding: 0;
}

.outline-label {
    font-size: 1.1rem;
    font-weight: 700;
    color: #1e40af;
    margin-bottom: 10px;
}

.outline-value {
    font-size: 1.05rem;
    color: #333;
    line-height: 1.7;
}

.outline-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 10px;
    color: #dc2626;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: color 0.3s ease;
}

.outline-link:hover {
    color: #1e40af;
}

.tentative {
    font-style: italic;
    color: #6b7280;
    font-size: 0.95rem;
}

/* Purpose Section */
#purpose {
    padding: 80px 20px;
    background: white;
    margin-bottom: 80px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #333;
    text-align: center;
    margin-bottom: 50px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: linear-gradient(135deg, #dc2626 0%, #1e40af 100%);
    margin: 20px auto 0;
    border-radius: 2px;
}

.purpose-block {
    max-width: 900px;
    margin: 0 auto 60px;
    padding: 40px;
    background: #f8f9fa;
    border-radius: 8px;
}

.purpose-block:last-child {
    margin-bottom: 0;
}

.purpose-subtitle {
    font-size: 2rem;
    font-weight: 700;
    color: #dc2626;
    margin-bottom: 25px;
    text-align: center;
}

.purpose-text {
    font-size: 1.1rem;
    line-height: 1.9;
    color: #333;
    margin-bottom: 20px;
    text-align: left;
}

.purpose-text em {
    font-style: italic;
    color: #1e40af;
    font-weight: 600;
}

.purpose-text-jp {
    font-size: 1rem;
    line-height: 1.9;
    color: #4b5563;
    margin-bottom: 20px;
    padding-top: 20px;
    border-top: 1px solid #e5e7eb;
    text-align: left;
}

.purpose-list {
    font-size: 1.1rem;
    line-height: 1.9;
    color: #333;
    margin: 20px 0 20px 30px;
    padding-left: 10px;
}

.purpose-list li {
    margin-bottom: 12px;
}

.purpose-list-jp {
    font-size: 1rem;
    line-height: 1.9;
    color: #4b5563;
    margin: 15px 0 20px 30px;
    padding-left: 10px;
}

.purpose-list-jp li {
    margin-bottom: 10px;
}

/* Details Section */
#details {
    padding: 80px 20px;
    margin-bottom: 80px;
}

.detail-block {
    background: white;
    padding: 0;
    border-radius: 0;
    margin-bottom: 40px;
    border: none;
}

.detail-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: #1e40af;
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.detail-title i {
    font-size: 1.3rem;
}

.detail-content {
    padding-left: 40px;
}

.detail-content p {
    font-size: 1.1rem;
    color: #555;
    margin-bottom: 12px;
    line-height: 1.8;
}

.chair-info {
    margin-bottom: 20px;
}

.chair-name {
    font-size: 1.2rem;
    font-weight: 600;
    color: #333;
}

.chair-country {
    font-size: 1rem;
    color: #888;
    font-style: italic;
}

.fee-amount {
    font-size: 1.1rem !important;
    font-weight: 400 !important;
    color: #555 !important;
    margin-bottom: 12px !important;
}

.fee-note {
    font-size: 1.1rem !important;
    color: #555 !important;
}

.format-note {
    font-style: italic;
    color: #999 !important;
    font-size: 0.95rem !important;
}

/* Program Section */
#program {
    padding: 80px 20px;
    background: #f8f9fa;
    margin-bottom: 80px;
}

.program-day {
    background: white;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    padding: 40px;
    margin-bottom: 40px;
    transition: border-color 0.3s ease;
}

.program-day:hover {
    border-color: #dc2626;
}

.day-header {
    margin-bottom: 40px;
    padding-bottom: 25px;
    border-bottom: 3px solid #e5e7eb;
}

.day-title {
    font-size: 2rem;
    font-weight: 700;
    color: #1e40af;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.day-title i {
    font-size: 1.7rem;
}

.day-subtitle {
    font-size: 1.4rem;
    font-weight: 600;
    color: #dc2626;
    margin-top: 10px;
}

.program-timeline {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.timeline-item {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 30px;
    padding: 25px;
    border-left: 4px solid #e5e7eb;
    transition: border-color 0.3s ease;
}

.timeline-item:hover {
    border-left-color: #1e40af;
}

.timeline-time {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.3rem;
    font-weight: 600;
    color: #4b5563;
}

.timeline-time i {
    color: #dc2626;
    font-size: 1.2rem;
}

.timeline-content {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.timeline-title {
    font-size: 1.2rem;
    font-weight: 500;
    color: #333;
    padding: 12px 20px;
    background: #f8f9fa;
    border-radius: 6px;
    border-left: 3px solid #1e40af;
    transition: all 0.3s ease;
}

.timeline-title:hover {
    background: #e5e7eb;
    transform: translateX(5px);
}

/* Committee Section */
#member {
    padding: 80px 20px;
    background: white;
    margin-bottom: 80px;
}

.committee-category {
    margin-bottom: 60px;
}

.category-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: #1e40af;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 3px solid #e5e7eb;
}

.category-subtitle {
    font-size: 1rem;
    font-weight: 400;
    color: #6b7280;
    font-style: italic;
}

.member-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.member-card {
    background: white;
    padding: 30px;
    border: none;
    border-radius: 0;
}

.member-name {
    font-size: 1.3rem;
    font-weight: 700;
    color: #1e40af;
    margin-bottom: 15px;
    line-height: 1.6;
}

.member-name-jp {
    font-size: 1.2rem;
    color: #4b5563;
    font-weight: 600;
    display: block;
    margin-top: 5px;
}

.member-role {
    font-size: 0.95rem;
    font-weight: 600;
    color: #dc2626;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}

.member-title {
    font-size: 1rem;
    color: #4b5563;
    line-height: 1.7;
    margin-bottom: 8px;
}

.member-title-jp {
    font-size: 0.95rem;
    color: #6b7280;
    line-height: 1.7;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid #e5e7eb;
}

/* Venue Section */
.venue-section {
    padding: 80px 20px;
    background: white;
    margin-bottom: 80px;
}

.venue-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.venue-info {
    background: white;
    padding: 50px;
    border-radius: 8px;
    border: 2px solid #e5e7eb;
}

.venue-name {
    font-size: 2rem;
    font-weight: 700;
    color: #333;
    margin-bottom: 15px;
}

.venue-address {
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 30px;
}

.venue-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 15px 35px;
    background: linear-gradient(135deg, #dc2626 0%, #1e40af 100%);
    color: white;
    text-decoration: none;
    border-radius: 30px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.venue-link:hover {
    opacity: 0.9;
}

/* CTA Section */
.cta-section {
    padding: 100px 20px;
    background: linear-gradient(135deg, #dc2626 0%, #1e40af 100%);
    color: white;
    text-align: center;
    margin-bottom: 0;
}

.cta-content {
    max-width: 700px;
    margin: 0 auto;
}

.cta-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 25px;
}

.cta-text {
    font-size: 1.3rem;
    margin-bottom: 40px;
    opacity: 0.95;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 18px 45px;
    background: white;
    color: #dc2626;
    border: none;
    border-radius: 35px;
    font-size: 1.2rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    font-family: 'Inter', sans-serif;
}

.cta-button:hover {
    opacity: 0.9;
    transform: scale(1.05);
}

/* footer */
footer.site-footer{
	background:var(--footer-bg);
	border-top:1px solid var(--line);
}
.footer-inner{
	display:grid;
	grid-template-columns:1fr 1fr;
	gap:24px;max-width:var(--max);
	margin:auto;padding:28px 20px;
}
.footer-col h4{
	margin:0 0 10px;
	font-size:16px;
	color:#111827;
}
.footer-col p{
	margin:4px 0;
	color:#334155;
	line-height:1.6;
	font-size:14px;
}
.footer-col a{
	color:#1f2937;
	text-decoration:underline
}
.footer-bottom{
	max-width:var(--max);
	margin:auto;
	padding:12px 20px;
	color:#6b7280;
	font-size:12px;
	display:flex;
	justify-content:space-between;
	align-items:center;
	background-color:#B3B9C0;
}
.accent-bar{
	height:6px;
	display:flex;
	width:100%;
}
.accent-red{
	background:var(--red);
	flex:1
}
.accent-blue{
	background:var(--blue);
	flex:2
}

/* copyright */
.copyright {
    background: #4b5563;
    color: white;
    padding: 50px 20px;
    text-align: center;
}

.copyright p {
    margin-bottom: 10px;
    opacity: 0.9;
}

.copyright-organizers {
    font-size: 0.95rem;
    opacity: 0.7;
}

/* Responsive Design */

@media (max-width: 768px) {

    .section-title {
        font-size: 2rem;
    }

    .info-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .detail-block {
        padding: 30px 25px;
    }

    .detail-content {
        padding-left: 0;
    }

    .venue-info {
        padding: 35px 25px;
    }

    .cta-title {
        font-size: 1.8rem;
    }

    .cta-text {
        font-size: 1.1rem;
    }

    .program-day {
        padding: 25px;
    }

    .day-title {
        font-size: 1.5rem;
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .day-subtitle {
        font-size: 1.1rem;
    }

    .timeline-item {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .timeline-time {
        font-size: 1.1rem;
    }

    .timeline-title {
        font-size: 1rem;
    }
	.footer-inner{
		grid-template-columns:1fr
	}
}

@media (max-width: 480px) {
    .header {
        margin-bottom: 50px;
    }

    .info-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .info-card {
        padding: 25px 20px;
    }

    .icon-wrapper {
        width: 50px;
        height: 50px;
    }

    .icon-wrapper i {
        font-size: 1.3rem;
    }

    .detail-title {
        font-size: 1.2rem;
    }

    .cta-button {
        padding: 15px 35px;
        font-size: 1rem;
    }

    .program-day {
        padding: 20px;
    }

    .day-title {
        font-size: 1.3rem;
    }

    .day-subtitle {
        font-size: 1rem;
    }

    .timeline-item {
        padding: 15px;
    }

    .timeline-title {
        padding: 10px 15px;
        font-size: 0.95rem;
    }

    .member-grid {
        grid-template-columns: 1fr;
    }

    .category-title {
        font-size: 1.4rem;
        flex-direction: column;
        align-items: flex-start;
    }

    .member-card {
        padding: 25px;
    }

    .member-name {
        font-size: 1.1rem;
    }

    .member-name-jp {
        font-size: 1rem;
    }

    .outline-label {
        font-size: 1rem;
    }

    .outline-value {
        font-size: 1rem;
    }

    .purpose-subtitle {
        font-size: 1.5rem;
    }
}

/* ===== Simple Header (ADD ONLY) ===== */
.site-header { background:#fff; border-bottom:1px solid #e5e7eb; position:relative; z-index:9999; }
.site-header .sh-inner { max-width:1200px; margin:0 auto; padding:12px 20px; display:flex; align-items:center; gap:24px; }
.sh-brand { font-weight:700; color:#111827; text-decoration:none; white-space:nowrap; }

/* PC: 横並び */
.sh-nav { margin-left:auto; }
.sh-menu { list-style:none; margin:0; padding:0; display:flex; gap:20px; }
.sh-menu a { text-decoration:none; color:#111827; padding:8px 6px; border-radius:6px; }
.sh-menu a:hover, .sh-menu a:focus { background:#f3f4f6; outline:none; }

/* ハンバーガー */
.sh-toggle { display:none; appearance:none; border:0; background:transparent; padding:10px; margin-left:auto; cursor:pointer; }
.sh-toggle span { display:block; width:26px; height:2px; margin:6px 0; background:#111827; transition:transform .2s ease, opacity .2s ease; }

/* モバイル */
@media (max-width: 960px){
  .sh-toggle { display:inline-block; }
  .sh-nav { 
    position:absolute; left:0; right:0; top:100%;
    background:#fff; border-bottom:1px solid #e5e7eb; display:none;
  }
  .site-header.is-open .sh-nav { display:block; }
  .sh-menu { display:block; }
  .sh-menu li { border-top:1px solid #f3f4f6; }
  .sh-menu a { display:block; padding:14px 18px; }

  /* X 変形 */
  .site-header.is-open .sh-toggle span:nth-child(1){ transform:translateY(8px) rotate(45deg); }
  .site-header.is-open .sh-toggle span:nth-child(2){ opacity:0; }
  .site-header.is-open .sh-toggle span:nth-child(3){ transform:translateY(-8px) rotate(-45deg); }
}

/* 写真 */
.member-photo {
    width: 50%;
    height: auto;
    display: block;
    margin-bottom: 12px;
    border-radius: 6px;  /* 角丸不要なら削除OK */
    object-fit: cover;   /* 必要なら維持、削除可 */
}

/* ===== Sponsor Section (ADD ONLY) ===== */
.sponsor-section {
  padding: 20px 20px 100px 20px;
  background: #f9fafb;
  border-bottom: 1px solid #e5e7eb;
}

.sponsor-inner {
  max-width: 1000px;
  margin: 0 auto;
  text-align: center;
}

.sponsor-title {
  font-size: 28px;
  font-weight: 700;
  color: #1f2d55; /* 深いブルー（ロゴ・サイト配色と調和） */
  margin-bottom: 20px;
}

.sponsor-desc {
  font-size: 16px;
  color: #333;
  line-height: 1.6;
  margin-bottom: 32px;
}

.sponsor-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

.sponsor-btn {
  display: inline-block;
  padding: 14px 24px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  text-decoration: none;
  border-radius: 9999px;
  background: linear-gradient(135deg, #334b99 0%, #1d2f61 100%);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.sponsor-btn:hover {
  opacity: 0.9;
  transform: translateY(-2px);
  text-decoration: none;
}

/* モバイル対応 */
@media (max-width: 768px) {
  .sponsor-btn {
    width: 100%;
    text-align: center;
  }
}