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

:root {
    --main-color: #0055aa;
    --accent-color: #FF6928;
    --text-color: #333;
    --bg-gray: #f9f9f9;
    --font-en: "Futura", "Century Gothic", sans-serif;
    --font-jp: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    --content-width: 1000px;
    --header-height: 80px;
}

body {
    margin: 0; padding: 0;
    color: var(--text-color);
    font-family: var(--font-jp);
    font-feature-settings: "palt";
    letter-spacing: 0.05em; 
    padding-top: var(--header-height);
    background-color: #fff;
    -webkit-text-size-adjust: 100%;
}

#header {
    width: 100%; height: var(--header-height); position: fixed; top: 0; left: 0; z-index: 999;
    background: rgba(255, 255, 255, 0.95); backdrop-filter: blur(10px);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    display: flex; align-items: center; transition: top 0.4s;
}

.header-inner { 
    width: 92%; max-width: var(--content-width); margin: 0 auto; 
    display: flex; justify-content: space-between; align-items: center; 
}

.logo-link { display: flex; align-items: center; text-decoration: none; color: var(--text-color); }
.logo-img { height: 44px; width: auto; margin-right: 15px; }

@media screen and (max-width: 480px) {
    .logo-img { height: 36px; margin-right: 10px; }
}

.logo-text { display: flex; flex-direction: column; line-height: 1.1; }
.text-upper { font-size: 16px; font-weight: bold; font-family: var(--font-en); letter-spacing: 0.08em; }
.text-lower { font-size: 10px; color: #666; font-family: var(--font-en); margin-top: 2px; }

.main-nav ul { display: flex; list-style: none; margin: 0; padding: 0; align-items: center; }
.main-nav > ul > li { margin-left: 30px; position: relative; padding: 10px 0; }
.main-nav a { text-decoration: none; color: var(--text-color); font-weight: 500; font-size: 14px; transition: color 0.3s; display: block; letter-spacing: 0.05em; }
.main-nav a:hover { color: var(--accent-color); }

.dropdown-menu {
    display: block; position: absolute; top: 100%; left: 50%; transform: translateX(-50%);
    background: rgba(255, 255, 255, 0.98); min-width: 240px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08); border-radius: 4px; padding: 10px 0 !important;
    opacity: 0; visibility: hidden; transition: all 0.3s ease;
    flex-direction: column !important; align-items: flex-start !important;
    border: 1px solid #eee;
}

@media screen and (min-width: 769px) {
    .main-nav > ul > li:hover .dropdown-menu { opacity: 1; visibility: visible; top: 100%; }
}

.dropdown-menu li { margin: 0 !important; width: 100%; list-style: none !important; }
.dropdown-menu li a { padding: 12px 20px; font-size: 13px; font-weight: normal; color: #555; white-space: nowrap; text-align: left; display: block; }
.dropdown-menu li a:hover { background: #f7f7f7; color: var(--main-color); }
.submenu-toggle { display: none; }

.hamburger { display: none; cursor: pointer; width: 30px; height: 25px; position: relative; z-index: 1000; }
.hamburger span { display: block; width: 100%; height: 2px; background: #333; position: absolute; transition: 0.3s; border-radius: 2px; }
.hamburger span:nth-child(1) { top: 0; } .hamburger span:nth-child(2) { top: 11px; } .hamburger span:nth-child(3) { top: 22px; }

@media screen and (max-width: 768px) {
    .hamburger { display: block; }
    .main-nav {
        position: fixed; top: 0; right: -100%; width: 85%; height: 100vh;
        background: #fff; padding-top: 80px; overflow-y: auto;
        transition: 0.4s cubic-bezier(0.4, 0, 0.2, 1); box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1); z-index: 998;
    }
    .main-nav.nav-active { right: 0; }
    .main-nav ul { flex-direction: column; align-items: flex-start; width: 100%; }
    .main-nav > ul > li {
        margin: 0; width: 100%; border-bottom: 1px solid #eee; padding: 0;
        display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
        box-sizing: border-box;
    }
    .main-nav > ul > li > a { padding: 18px 20px; flex: 1; color: #333; font-size: 16px; }
    
    .submenu-toggle {
        display: block; position: relative; width: 54px; height: 54px;
        border-left: 1px solid #eee; cursor: pointer; z-index: 10; background: transparent; flex-shrink: 0;
    }
    .submenu-toggle::before, .submenu-toggle::after {
        content: ''; position: absolute; top: 50%; left: 50%; background-color: #333; transform: translate(-50%, -50%); transition: transform 0.3s;
    }
    .submenu-toggle::before { width: 14px; height: 2px; }
    .submenu-toggle::after { width: 2px; height: 14px; }
    
    .main-nav > ul > li.open { background-color: #fafafa; }
    .main-nav > ul > li.open .submenu-toggle::after { transform: translate(-50%, -50%) rotate(90deg); opacity: 0; }
    .main-nav > ul > li.open .submenu-toggle { background: #eee; }
    
    .dropdown-menu {
        display: none !important; position: static; width: 100%; padding: 0 0 10px 0 !important;
        background: transparent; box-shadow: none; opacity: 1; visibility: visible; transform: none;
        text-align: left; border: none; border-top: 1px solid #eee;
    }
    .main-nav > ul > li.open .dropdown-menu { display: block !important; animation: slideDown 0.3s ease; }
    .dropdown-menu li { margin-bottom: 0 !important; }
    .dropdown-menu li a { padding: 12px 20px 12px 40px; font-size: 14px; color: #555; }
    
    @keyframes slideDown { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }
    
    .hamburger.active span:nth-child(1) { transform: rotate(45deg); top: 11px; }
    .hamburger.active span:nth-child(2) { opacity: 0; }
    .hamburger.active span:nth-child(3) { transform: rotate(-45deg); top: 11px; }
    .btn-contact { margin: 20px; display: block; width: auto; text-align: center; background: #333; color: #fff !important; padding: 12px; border-radius: 4px; font-weight: bold; }
}

.container { width: 92%; max-width: var(--content-width); margin: 0 auto; }
h1 { text-align: center; font-size: clamp(1.5rem, 4vw, 2.2rem); margin: 40px 0; font-weight: 700; letter-spacing: 0.1em; line-height: 1.4; }
h2 { border-left: 6px solid var(--main-color); padding-left: 15px; margin: 60px 0 30px; font-size: clamp(1.3rem, 3vw, 1.6rem); scroll-margin-top: 100px; line-height: 1.4; }
h3 { text-align: center; margin: 40px 20px; font-size: clamp(1.2rem, 2.5vw, 1.4rem); line-height: 1.6; }
section { margin-bottom: 60px; }
p { line-height: 1.8; margin-bottom: 24px; color: #444; text-align: justify; word-wrap: break-word;}

.top-lead-text {
    text-align: center;
    font-size: clamp(0.9rem, 3vw, 1.1rem);
    color: #444;
    margin: -20px 0 40px;
    padding: 0 15px;
    line-height: 1.8;
    font-weight: 500;
}

.info-grid { display: grid; grid-template-columns: 100px 1fr; gap: 15px 20px; margin-top: 20px; font-size: 16px; }
.info-label { font-weight: bold; color: var(--main-color); text-align: right; display: flex; align-items: baseline; justify-content: flex-end; }
.info-label:after { content: ""; display: inline-block; width: 1px; height: 12px; background: #ccc; margin-left: 15px; }
.info-value { text-align: left; line-height: 1.8; }
@media screen and (max-width: 600px) {
    .info-grid { grid-template-columns: 1fr; gap: 8px; margin-top: 30px; }
    .info-label { text-align: left; justify-content: flex-start; padding-top: 10px; border-top: 1px dotted #eee; }
    .info-label:first-child { border-top: none; padding-top: 0; }
    .info-label::after { display: none; }
    .info-value { padding-bottom: 10px; }
}

#sketch-slider-area { width: 100%; max-width: 1000px; margin: 30px auto; padding: 0 20px; }
.slider-container { 
    border: 1px solid #ddd; border-radius: 12px; padding: 20px; display: flex; 
    align-items: center; justify-content: space-between; background: #fff; 
    box-shadow: 0 8px 20px rgba(0,0,0,0.06); position: relative; overflow: hidden; 
    min-height: 400px; padding-bottom: 50px;
}
.arrow-btn { 
    background: rgba(255,255,255,0.8); border: 1px solid #ccc; border-radius: 50%; 
    width: 44px; height: 44px; font-size: 24px; line-height: 1; cursor: pointer; 
    color: #555; flex-shrink: 0; z-index: 10; transition: 0.3s; 
    display: flex; justify-content: center; align-items: center;
}
.arrow-btn:hover { border-color: var(--main-color); color: var(--main-color); background: #fff; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.slider-content { display: flex; width: 100%; margin: 0 20px; align-items: center; position: relative; height: 100%; }
.slider-text-box { width: 40%; position: relative; padding-right: 30px; height: 300px; } 
.slide-text { 
    position: absolute; top: 0; left: 0; width: 100%; height: 100%; 
    opacity: 0; transition: opacity 0.5s ease; pointer-events: none; 
    display: flex; flex-direction: column; justify-content: center; align-items: flex-start; 
}
.slide-text.active { opacity: 1; pointer-events: auto; z-index: 5; }
.slide-text h3 { 
    font-size: 24px; margin: 0 0 15px 0; border-bottom: 3px solid var(--accent-color); 
    display: inline-block; background: #fff; text-align: left;
}
.slide-desc { margin-bottom: 20px; font-size: 15px; color: #666; }
.slider-image-box { width: 60%; height: 300px; position: relative; overflow: hidden; border-radius: 8px; background: #eee; }
.slide-img { position: absolute; top: 0; left: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0; transition: opacity 0.8s ease; }
.slide-img.active { opacity: 1; z-index: 1; }
.slider-link-btn {
    display: inline-block; color: #fff; background: #333; text-decoration: none; 
    font-size: 14px; padding: 10px 24px; border-radius: 30px; transition: 0.3s; 
}
.slider-link-btn:hover { background: var(--main-color); transform: translateY(-2px); box-shadow: 0 4px 10px rgba(0,85,170,0.3); }
.slider-pagination {
    position: absolute; bottom: 15px; left: 50%; transform: translateX(-50%);
    display: flex; gap: 10px; z-index: 20;
}
.pagination-dot {
    width: 10px; height: 10px; background-color: #ddd; border-radius: 50%;
    cursor: pointer; transition: all 0.3s ease;
}
.pagination-dot.active { background-color: var(--main-color); transform: scale(1.2); }
.countdown-box { 
    margin-top: 20px; border: 1px solid #ddd; border-radius: 10px; 
    padding: 20px 15px; text-align: center; background: #fff; 
    box-shadow: 0 2px 5px rgba(0,0,0,0.03);
}
.timer-display { font-feature-settings: "tnum"; } 
.timer-display span { font-size: clamp(1.5rem, 5vw, 2rem); color: var(--main-color); font-weight: bold; }

@media screen and (max-width: 768px) {
    .slider-container { flex-direction: column; padding: 15px; min-height: auto; }
    .arrow-btn { 
        position: absolute; top: 35%; transform: translateY(-50%); 
        width: 36px; height: 36px; font-size: 18px; 
        background: rgba(255,255,255,0.7); border: none;
    }
    .prev-btn { left: 10px; }
    .next-btn { right: 10px; }
    .slider-content { flex-direction: column-reverse; margin: 0; height: auto; }
    .slider-image-box { width: 100%; height: 200px; margin-bottom: 20px; }
    .slider-text-box { width: 100%; height: auto; min-height: 160px; padding-right: 0; text-align: center; margin-bottom: 20px; }
    .slide-text { position: relative; opacity: 0; height: 0; overflow: hidden; align-items: center; }
    .slide-text.active { opacity: 1; height: auto; overflow: visible; }
    .slide-text h3 { font-size: 20px; text-align: center; margin-bottom: 10px; }
    .slide-desc { font-size: 14px; margin-bottom: 15px; }
}

.concept-section {
    background: radial-gradient(ellipse at center, rgba(0, 85, 170, 0.15) 0%, rgba(0, 85, 170, 0) 70%);
    border-radius: 50%; width: 90%; max-width: 700px; padding: 80px 20px;  
    margin: 60px auto 80px; text-align: center; display: flex; justify-content: center; align-items: center;
}
.concept-title { margin: 0; line-height: 1.5; color: var(--text-color); }
.text-main { font-size: clamp(1.5rem, 6vw, 2rem); font-weight: bold; display: block; color: var(--main-color); }
.text-sub { font-size: clamp(1rem, 4vw, 1.6rem); font-weight: bold; display: block; margin-top: 10px; color: #555; }
@media screen and (max-width: 600px) {
    .concept-section { padding: 50px 15px; border-radius: 20px; background: rgba(0, 85, 170, 0.05); width: 95%; }
}

.about-container { display: flex; flex-wrap: wrap; gap: 40px; align-items: center; justify-content: center; margin-bottom: 40px; }
.poster-visual {
    flex: 1; min-width: 280px; max-width: 400px; width: 100%; height: auto;
    box-shadow: 0 10px 25px rgba(0,0,0,0.15); border-radius: 8px; transition: transform 0.3s ease;
}
.poster-visual:hover { transform: scale(1.02); }
.about-text-content { flex: 1; min-width: 280px; }

.btn-area {
    text-align: center; margin: 40px 0 80px 0; display: flex;
    flex-direction: column; gap: 20px; align-items: center; width: 100%;
}
@media screen and (min-width: 768px) {
    .btn-area { flex-direction: row; justify-content: center; }
}
.default-link-btn {
    display: inline-flex; justify-content: center; align-items: center; white-space: nowrap;
    background-color: var(--main-color); color: #fff; padding: 12px 10px; border-radius: 50px;
    text-decoration: none; font-weight: bold; font-size: clamp(12px, 3.8vw, 16px);
    transition: 0.3s; box-shadow: 0 4px 10px rgba(0, 85, 170, 0.2); width: 100%; max-width: 320px;
    border: 2px solid var(--main-color);
}
.default-link-btn:hover {
    background-color: #fff; color: var(--main-color); transform: translateY(-3px);
    box-shadow: 0 6px 15px rgba(0, 85, 170, 0.3);
}
@media screen and (max-width: 768px) {
    .about-container { flex-direction: column; gap: 30px; }
    .poster-visual { max-width: 80%; margin: 0 auto; }
}

#contact { background: #333; color: #fff; padding: 60px 0 20px; margin-top: 100px; scroll-margin-top: 100px; }
.footer-inner { max-width: var(--content-width); margin: 0 auto; text-align: center; padding: 0 20px; }

.footer-sponsors { margin-bottom: 50px; }
.footer-sponsors h3 { color: #fff; font-size: clamp(1.1rem, 3vw, 1.3rem); margin-bottom: 20px; }
.sponsor-list { 
    list-style: none; padding: 0; display: flex; flex-wrap: wrap; justify-content: center; gap: 15px; margin-bottom: 50px; 
}
.sponsor-list li { 
    background: #444; padding: 10px 20px; border-radius: 4px; font-size: 13px; letter-spacing: 0.05em; color: #fff; 
}
.sponsor-list a { color: #ffffff; text-decoration: none; display: block; }
.sponsor-list a:hover { opacity: 0.8; }

.footer-sitemap {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    justify-content: center; gap: 40px 20px; text-align: left;
    margin-bottom: 60px; padding: 0 10px; align-items: start; 
}
.footer-col h4 {
    color: #fff; font-size: 15px; margin-bottom: 20px; padding-bottom: 8px;
    border-bottom: 2px solid var(--main-color); display: inline-block; 
    min-width: 40px; letter-spacing: 0.05em;
}
.footer-col h4 a { color: #fff; text-decoration: none; font-weight: bold; display: block; }
.footer-col h4 a:hover { opacity: 0.8; }
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: 10px; }
.footer-col li a {
    color: #bbb; text-decoration: none; font-size: 13px; transition: all 0.3s ease;
    display: block; line-height: 1.6; position: relative; padding-left: 0;
}
.footer-col li a:hover { color: #fff; padding-left: 5px; }

@media screen and (max-width: 768px) {
    .footer-sitemap { grid-template-columns: repeat(2, 1fr); gap: 40px 15px; }
    .footer-col h4 { width: 100%; border-bottom: 1px solid #555; }
}
@media screen and (max-width: 480px) {
    .footer-sitemap { grid-template-columns: 1fr; gap: 30px; text-align: center; }
    .footer-col h4 { margin-bottom: 15px; }
    .footer-col ul { display: flex; flex-direction: column; align-items: center; }
}

.footer-line { border: none; border-top: 1px solid #555; margin: 40px 0; }
.footer-info h3 { color: #fff; margin-bottom: 15px; }
.footer-info h3 span { font-size: 0.9em; }
.footer-info p { text-align: center !important; color: #ccc !important; font-size: 14px; line-height: 1.8; }
.footer-info a { color: #88ccff; text-decoration: none; font-weight: bold; }
.copyright { margin-top: 40px; font-size: 12px; color: #777; font-family: var(--font-en); }