*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
    html { font-size: 16px; scroll-behavior: smooth; }
    body { font-family: 'Noto Sans JP', sans-serif; color: #1A1A1A; background: #fff; min-height: 100vh; }
    a { text-decoration: none; color: inherit; }
    button { border: none; background: none; cursor: pointer; font-family: inherit; }
    img { max-width: 100%; height: auto; display: block; }
    ul { list-style: none; }
    input, textarea { font-family: inherit; }

    /* ── Animations ── */
    .fade-up { opacity: 0; transform: translateY(30px); transition: opacity 0.7s ease, transform 0.7s ease; }
    .fade-up.visible { opacity: 1; transform: translateY(0); }
    .fade-left { opacity: 0; transform: translateX(-40px); transition: opacity 0.7s ease, transform 0.7s ease; }
    .fade-left.visible { opacity: 1; transform: translateX(0); }
    .fade-right { opacity: 0; transform: translateX(40px); transition: opacity 0.7s ease, transform 0.7s ease; }
    .fade-right.visible { opacity: 1; transform: translateX(0); }
    .fade-in { opacity: 0; transition: opacity 0.5s ease; }
    .fade-in.visible { opacity: 1; }

    /* ── Navbar ── */
    .navbar { position: fixed; top: 0; left: 0; right: 0; z-index: 50; background: #1A4899; box-shadow: 0 2px 8px rgba(0,0,0,0.15); transition: transform 0.3s ease; }
    .navbar.hidden-nav { transform: translateY(-100%); }
    .navbar-inner { max-width: 1280px; margin: 0 auto; padding: 0 1rem; display: flex; align-items: center; justify-content: space-between; height: 56px; }
    @media(min-width:768px) { .navbar-inner { height: 64px; padding: 0 1.5rem; } }
    .nav-logo { display: flex; align-items: center; }
    .nav-logo svg { width: 180px; height: auto; }
    .nav-links { display: none; align-items: center; gap: 2rem; }
    @media(min-width:768px) { .nav-links { display: flex; } }
    .nav-links a { color: rgba(255,255,255,0.8); font-size: 0.875rem; transition: color 0.2s; }
    .nav-links a:hover { color: #C9A84C; }
    .hamburger { display: block; color: white; padding: 0.5rem; }
    @media(min-width:768px) { .hamburger { display: none; } }
    .mobile-menu { display: none; background: #1A4899; border-top: 1px solid rgba(255,255,255,0.1); padding: 1rem 0; }
    .mobile-menu.open { display: block; }
    .mobile-menu a { display: block; padding: 0.75rem 1rem; color: rgba(255,255,255,0.8); transition: color 0.2s, background 0.2s; }
    .mobile-menu a:hover { color: #C9A84C; background: rgba(255,255,255,0.05); }

    /* ── Hero ── */
    .hero { width: 100%; padding-top: 56px; }
    @media(min-width:768px) { .hero { padding-top: 64px; } }
    .hero img { width: 100%; height: auto; }
    .hero-video { position: relative; width: 100%; padding-bottom: 56.25%; overflow: hidden; }
    .hero-video iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: 0; pointer-events: none; }
    .hero-video-overlay { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 1; cursor: default; }

    /* ── Section Header ── */
    .section-header { text-align: center; margin-bottom: 2rem; overflow: hidden; position: relative; }
    @media(min-width:768px) { .section-header { margin-bottom: 3rem; } }
    .watermark { display: block; text-align: center; text-transform: uppercase; line-height: 1; user-select: none; font-family: 'Bakbak One', sans-serif; font-size: clamp(2.5rem, 8vw, 6rem); color: #1A4899; opacity: 0.18; letter-spacing: -0.02em; }
    .section-title-group { display: flex; flex-direction: column; align-items: center; gap: 0.375rem; margin-top: -1.25rem; }
    @media(min-width:768px) { .section-title-group { margin-top: -2.5rem; } }
    .section-title { color: #1A4899; font-size: clamp(1.5rem, 4vw, 2.25rem); font-weight: 900; line-height: 1.4; }

    /* ── Section Arrow ── */
    .section-arrow { display: flex; flex-direction: column; align-items: center; gap: 3px; }

    /* ── Vision ── */
    .vision { padding: 4rem 0; background: #fff; }
    @media(min-width:768px) { .vision { padding: 6rem 0; } }
    .vision-container { max-width: 1280px; margin: 0 auto; padding: 0 1rem; }
    @media(min-width:768px) { .vision-container { padding: 0 1.5rem; } }
    .vision-subtitle { color: #1A4899; font-size: 18px; font-weight: 700; margin-top: 0; }
    .vision-text { max-width: 48rem; margin: 0 auto 2rem; }
    @media(min-width:768px) { .vision-text { margin-bottom: 3rem; } }
    .vision-text-inner { border-left: 4px solid #C9A84C; padding-left: 1.5rem; }
    .vision-text-inner p { color: #1A1A1A; font-size: 0.9375rem; line-height: 2; margin-bottom: 1.25rem; }
    .vision-text-inner p:last-child { margin-bottom: 0; }
    .diagrams { display: grid; grid-template-columns: 1fr; gap: 2rem; }
    @media(min-width:1024px) { .diagrams { grid-template-columns: 2fr 3fr; gap: 3rem; } }
    .diagram-card { border-radius: 2px; padding: 1.5rem; text-align: center; display: flex; flex-direction: column; }
    .diagram-current { background: #F5F7FA; }
    .diagram-vision { background: #1A4899; }
    .diagram-title { font-size: 1.125rem; font-weight: 700; margin-bottom: 0.25rem; }
    .diagram-current .diagram-title { color: #1A4899; }
    .diagram-vision .diagram-title { color: #fff; font-size: 1.25rem; }
    .diagram-subtitle-bar { display: flex; align-items: center; justify-content: center; gap: 0.75rem; margin-bottom: 1rem; }
    .diagram-subtitle-bar .line { height: 1px; flex: 1; }
    .diagram-current .diagram-subtitle-bar .line { background: rgba(26,72,153,0.2); }
    .diagram-vision .diagram-subtitle-bar .line { background: rgba(201,168,76,0.4); }
    .diagram-subtitle-bar span { font-family: 'Bakbak One', sans-serif; font-size: 1rem; letter-spacing: 0.04em; }
    .diagram-current .diagram-subtitle-bar span { color: rgba(26,72,153,0.5); }
    .diagram-vision .diagram-subtitle-bar span { color: #C9A84C; font-size: 1.1rem; letter-spacing: 0.06em; }
    .diagram-svg-wrap { flex: 1; display: flex; align-items: center; justify-content: center; }
    .diagram-svg-wrap svg { width: 100%; max-width: 300px; margin: 0 auto; }
    .vision-caption { text-align: center; color: #6b7280; margin-top: 2.5rem; max-width: 42rem; margin-left: auto; margin-right: auto; font-size: 0.875rem; line-height: 1.9; }

    /* ── Workshops ── */
    .workshops { padding: 4rem 0; background: #F5F7FA; position: relative; }
    @media(min-width:768px) { .workshops { padding: 6rem 0; } }
    .workshops-container { max-width: 64rem; margin: 0 auto; padding: 0 1rem; }
    @media(min-width:768px) { .workshops-container { padding: 0 1.5rem; } }
    .tabs-wrapper { display: flex; justify-content: center; margin-bottom: 2rem; position: sticky; z-index: 40; transition: all 0.3s; padding: 0; }
    @media(min-width:768px) { .tabs-wrapper { position: static; margin-bottom: 3rem; } }
    .tabs-inner { display: inline-flex; gap: 0.5rem; background: rgba(255,255,255,0.8); backdrop-filter: blur(4px); border-radius: 9999px; box-shadow: 0 1px 3px rgba(0,0,0,0.05); border: 1px solid #f3f4f6; padding: 0.375rem; }
    .tab-btn { border-radius: 9999px; padding: 0.75rem 1.5rem; font-size: 0.9375rem; font-weight: 500; color: #4b5563; background: rgba(255,255,255,0.6); border: 1px solid rgba(229,231,235,0.8); transition: all 0.3s; }
    .tab-btn:hover { background: rgba(26,72,153,0.1); color: #1A4899; border-color: rgba(26,72,153,0.3); box-shadow: 0 1px 3px rgba(0,0,0,0.05); transform: scale(1.05); }
    .tab-btn.active { background: #1A4899; color: #fff; font-weight: 700; box-shadow: 0 2px 6px rgba(26,72,153,0.3); border-color: transparent; }
    .tab-content { background: #fff; border-radius: 2px; padding: 1.5rem; box-shadow: 0 1px 3px rgba(0,0,0,0.05); animation: fadeUp 0.4s ease; max-width: 1140px; margin: 0 auto; }
    @media(min-width:768px) { .tab-content { padding: 2.5rem; } }
    @keyframes fadeUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
    .tab-content-title { color: #1A4899; font-size: 1.125rem; font-weight: 700; line-height: 1.5; margin-bottom: 1.5rem; }

    /* Workshop sub-sections */
    .ws-section { margin-bottom: 2.5rem; }
    .ws-section:last-child { margin-bottom: 0; }
    .ws-label { color: #1A4899; font-size: 0.9375rem; font-weight: 700; margin-bottom: 0.75rem; display: flex; align-items: center; gap: 0.5rem; }
    .ws-label .bar { width: 4px; height: 20px; background: #C9A84C; border-radius: 9999px; flex-shrink: 0; }
    .ws-text { color: #4b5563; font-size: 15px; line-height: 2; }
    .ws-meta { display: flex; flex-wrap: wrap; gap: 1rem; margin-bottom: 2.5rem; }
    .ws-meta-item { display: flex; align-items: center; gap: 0.5rem; color: #1A4899; font-size: 0.875rem; }
    .ws-meta-icon { width: 28px; height: 28px; border-radius: 50%; background: rgba(26,72,153,0.1); border: 1px solid rgba(26,72,153,0.15); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
    .ws-meta-icon svg { width: 13px; height: 13px; color: #1A4899; }
    .event-title-badge { background: #1A4899; border-radius: 2px; padding: 1rem 1.5rem; margin-bottom: 2.5rem; }
    .event-title-badge p { color: #C9A84C; font-size: 1rem; font-weight: 700; line-height: 1.6; }
    .participant-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
    .participant-tag { display: inline-block; color: #1A4899; background: rgba(26,72,153,0.08); border: 1px solid rgba(26,72,153,0.15); padding: 0.375rem 0.875rem; border-radius: 2px; font-size: 0.8125rem; font-weight: 700; }
    .participant-group { margin-bottom: 1rem; }
    .participant-members { color: #4b5563; font-size: 15px; line-height: 1.8; margin-top: 0.25rem; }
    .case-study-card { background: #F5F7FA; border-radius: 2px; padding: 1.25rem; margin-bottom: 1rem; }
    .case-study-card:last-child { margin-bottom: 0; }
    .case-study-speaker { color: #1A4899; font-size: 0.9rem; font-weight: 700; margin-bottom: 0.5rem; }
    .case-study-role { color: rgba(26,72,153,0.6); font-size: 0.75rem; margin-left: 0.5rem; font-weight: 400; }
    .case-study-desc { color: #4b5563; font-size: 0.875rem; line-height: 1.9; }
    .municipal-case { border-left: 2px solid rgba(26,72,153,0.2); padding-left: 1rem; margin-bottom: 1rem; }
    .municipal-case:last-child { margin-bottom: 0; }
    .municipal-city { color: #1A4899; font-size: 0.875rem; font-weight: 700; margin-bottom: 0.25rem; }
    .municipal-content { color: #4b5563; font-size: 0.875rem; line-height: 1.9; }
    .ws-step { margin-bottom: 1rem; }
    .ws-step-label { display: inline-block; background: #1A4899; color: #fff; padding: 0.25rem 0.75rem; border-radius: 2px; font-family: 'Bakbak One', sans-serif; font-size: 0.7rem; letter-spacing: 0.02em; margin-bottom: 0.5rem; }
    .ws-list-item { display: flex; align-items: flex-start; gap: 0.5rem; margin-bottom: 0.5rem; }
    .ws-list-diamond { width: 6px; height: 6px; background: #C9A84C; border-radius: 2px; transform: rotate(45deg); flex-shrink: 0; margin-top: 0.4rem; }
    .ws-list-text { color: #4b5563; font-size: 0.875rem; line-height: 1.8; }
    .special-session { border: 1px solid rgba(26,72,153,0.15); border-radius: 2px; padding: 1.25rem; margin-bottom: 1rem; }
    .special-session:last-child { margin-bottom: 0; }
    .special-session-title { color: #1A4899; font-size: 0.9rem; font-weight: 700; margin-bottom: 0.75rem; }
    .special-session-grid { display: grid; grid-template-columns: 1fr; gap: 0.25rem 1.5rem; }
    @media(min-width:640px) { .special-session-grid { grid-template-columns: 1fr 1fr; } }
    .special-session-label { color: #C9A84C; font-size: 0.75rem; font-weight: 700; }
    .special-session-value { color: #374151; font-size: 0.875rem; margin-bottom: 0.5rem; }
    .special-session-value .role { color: #9ca3af; font-size: 0.75rem; margin-left: 0.25rem; }
    .broadcast-note { display: flex; align-items: center; gap: 0.75rem; background: rgba(26,72,153,0.05); border: 1px solid rgba(26,72,153,0.1); border-radius: 2px; padding: 0.75rem 1.25rem; }
    .broadcast-icon { width: 32px; height: 32px; border-radius: 50%; background: rgba(26,72,153,0.1); border: 1px solid rgba(26,72,153,0.2); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
    .broadcast-text { color: #1A4899; font-size: 0.875rem; }

    /* ── Carousel ── */
    .carousel-sp { position: relative; overflow: hidden; aspect-ratio: 4/3; background: #f3f4f6; margin-bottom: 2.5rem; }
    @media(min-width:768px) { .carousel-sp { display: none; } }
    .carousel-track { display: flex; height: 100%; transition: transform 0.5s ease-in-out; }
    .carousel-track.no-transition { transition: none; }
    .carousel-slide { flex-shrink: 0; width: 100%; height: 100%; }
    .carousel-slide img { width: 100%; height: 100%; object-fit: cover; }
    .carousel-counter { position: absolute; top: 0.5rem; right: 0.75rem; color: rgba(255,255,255,0.8); background: rgba(0,0,0,0.3); border-radius: 9999px; padding: 0.125rem 0.5rem; font-family: 'Bakbak One', sans-serif; font-size: 0.7rem; }
    .carousel-btn { position: absolute; top: 50%; transform: translateY(-50%); width: 36px; height: 36px; display: flex; align-items: center; justify-content: center; background: rgba(0,0,0,0.3); color: #fff; transition: background 0.2s; }
    .carousel-btn:hover { background: rgba(0,0,0,0.5); }
    .carousel-btn.prev { left: 0.5rem; }
    .carousel-btn.next { right: 0.5rem; }
    .carousel-pc { position: relative; display: none; overflow: hidden; background: #f3f4f6; padding-bottom: 52.5%; margin-bottom: 2.5rem; }
    @media(min-width:768px) { .carousel-pc { display: block; } }
    .carousel-pc-slide { position: absolute; top: 0; left: 15%; width: 70%; height: 100%; transition: transform 0.5s ease-in-out, opacity 0.5s ease-in-out; }
    .carousel-pc-slide.no-transition { transition: none; }
    .carousel-pc-slide img { width: 100%; height: 100%; object-fit: cover; }
    .carousel-pc-counter { position: absolute; top: 0.75rem; z-index: 10; right: calc(15% + 0.75rem); font-family: 'Bakbak One', sans-serif; font-size: 0.7rem; }
    .carousel-pc-counter span { color: rgba(255,255,255,0.8); background: rgba(0,0,0,0.3); border-radius: 9999px; padding: 0.125rem 0.5rem; }
    .carousel-pc .carousel-btn { z-index: 10; width: 40px; height: 40px; }
    .carousel-pc .carousel-btn.prev { left: 0.75rem; }
    .carousel-pc .carousel-btn.next { right: 0.75rem; }

    /* ── Footer ── */
    .footer-logos { background: #fff; }
    .footer-logos-inner { max-width: 1280px; margin: 0 auto; padding: 2rem 1rem; display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 2.5rem; }
    @media(min-width:768px) { .footer-logos-inner { gap: 4rem; padding: 2rem 1.5rem; } }
    .footer-bottom { background: #fff; border-top: 1px solid #f3f4f6; }
    .footer-bottom-inner { max-width: 1280px; margin: 0 auto; padding: 1.25rem 1rem; display: flex; flex-direction: column; align-items: center; gap: 0.75rem; }
    .footer-copyright { color: #9ca3af; font-size: 0.75rem; }
    .footer-links { display: flex; align-items: center; gap: 1.5rem; }
    .footer-links a { color: #9ca3af; font-size: 0.75rem; transition: color 0.2s; }
    .footer-links a:hover { color: #4b5563; }