/* * ==============================================
 * Global Settings & Variables
 * ==============================================
 */
:root {
    /* PCでのカードサイズ (Top Page) */
    --card-width-pc: 600px;
    --card-height-pc: 400px;

    /* スマホでのカードサイズ (Top Page) */
    --card-width-sp: 300px;
    --card-height-sp: 200px;

    /* Colors */
    --color-bg: #ffffff;
    --color-bg-alt: #f9f9f9;
    --color-text: #1a1a1a;
    --color-text-light: #666666;
    --color-accent: #C5A059;
    --color-border: #eaeaea;
    
    /* Fonts */
    --font-sans: 'Noto Sans JP', sans-serif;
    --font-serif: 'Shippori Mincho', serif;
    
    /* Layout */
    --header-height: 80px;
    --container-width: 1200px;
    --easing: cubic-bezier(0.22, 1, 0.36, 1);
}

/* --- Base --- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; }

/* Lenis Recommended */
html.lenis { height: auto; }
.lenis.lenis-smooth { scroll-behavior: auto; }
.lenis.lenis-smooth [data-lenis-prevent] { overscroll-behavior: contain; }
.lenis.lenis-stopped { overflow: hidden; }
.lenis.lenis-scrolling iframe { pointer-events: none; }

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a { text-decoration: none; color: inherit; transition: color 0.3s var(--easing); }
ul { list-style: none; }

/* --- Utility Classes --- */
.container { width: 90%; max-width: var(--container-width); margin: 0 auto; }
.text-accent { color: var(--color-accent); font-weight: 700; }
.text-serif { font-family: var(--font-serif); }

/* * ==============================================
 * Common Components (Header, Footer, Loader)
 * ==============================================
 */

/* --- Header --- */
.site-header {
    position: fixed; top: 0; left: 0; width: 100%; height: var(--header-height);
    z-index: 1000; background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px); border-bottom: 1px solid rgba(0,0,0,0.05);
    transition: transform 0.3s var(--easing), background 0.3s;
}
.site-header .container {
    display: flex; justify-content: space-between; align-items: center;
    height: 100%; flex-wrap: nowrap;
}
.logo {
    font-family: var(--font-serif); font-weight: 700; font-size: 1.25rem;
    letter-spacing: 0.05em; display: flex; align-items: center; flex-shrink: 0;
}
.logo span {
    color: var(--color-accent); margin-left: 10px; font-family: var(--font-sans);
    font-weight: 900; font-size: 0.9em; border: 1px solid var(--color-accent);
    padding: 2px 8px; border-radius: 20px;
}

/* Navigation (Top Page) */
.main-nav ul { display: flex; gap: 25px; }
.main-nav a {
    font-size: 0.85rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 0.05em; position: relative; white-space: nowrap;
}
.main-nav a::after {
    content: ''; position: absolute; bottom: -5px; left: 0; width: 0;
    height: 2px; background: var(--color-accent); transition: width 0.3s var(--easing);
}
.main-nav a:hover::after { width: 100%; }

/* Back Link (Sub Pages) */
.back-link {
    font-size: 0.9rem; font-weight: 700; display: flex; align-items: center; gap: 8px;
}
.back-link:hover { color: var(--color-accent); }

/* Mobile Nav Toggle */
.nav-toggle {
    display: none; flex-direction: column; justify-content: space-between;
    width: 30px; height: 20px; cursor: pointer; z-index: 1001; position: relative;
}
.nav-toggle span {
    display: block; width: 100%; height: 2px; background: var(--color-text);
    transition: all 0.3s var(--easing); position: absolute; left: 0;
}
.nav-toggle span:nth-child(1) { top: 0; }
.nav-toggle span:nth-child(2) { top: 9px; }
.nav-toggle span:nth-child(3) { top: 18px; }
.nav-toggle.active span:nth-child(1) { transform: rotate(45deg); top: 9px; }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg); top: 9px; }

/* --- Footer --- */
.site-footer { background: #1a1a1a; color: #fff; padding: 80px 0 40px; border-top: 1px solid #333; }
.footer-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 60px; padding-bottom: 40px; border-bottom: 1px solid #333; }
.footer-links a { margin-left: 30px; font-size: 0.9rem; color: #888; }
.footer-links a:hover { color: var(--color-accent); }
.footer-bottom { text-align: center; font-size: 0.75rem; color: #666; }

/* --- Loading Screen --- */
.loader {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: #fff; z-index: 9999;
    display: flex; justify-content: center; align-items: center;
    transition: opacity 0.8s var(--easing), visibility 0.8s var(--easing);
}
.loader.loaded { opacity: 0; visibility: hidden; }
.loader.hidden-immediately { display: none; }
.loader-logo {
    font-family: var(--font-serif); font-size: 2rem;
    font-weight: 700; color: var(--color-text);
    position: relative; overflow: hidden;
}
.loader-logo span {
    display: inline-block;
    /* 初期状態: 下に隠しておく */
    transform: translateY(110%);
    will-change: transform;
    /* CSSアニメーション定義: JSを待たずに動く */
    animation: slideUpLogo 1.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes slideUpLogo {
    from { transform: translateY(110%); }
    to { transform: translateY(0); }
}

/* * ==============================================
 * Top Page Specific Styles (index.html)
 * ==============================================
 */
section { padding: 120px 0; position: relative; }

/* Hero & Carousel */
.hero-section {
    min-height: 100vh; display: flex; align-items: center;
    padding-top: var(--header-height);
    background: radial-gradient(circle at 80% 20%, rgba(197, 160, 89, 0.05) 0%, transparent 40%),
                radial-gradient(circle at 20% 80%, rgba(197, 160, 89, 0.05) 0%, transparent 40%);
    overflow: hidden; position: relative; perspective: 1000px;
}
.scene-container {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    display: flex; align-items: center; justify-content: center; z-index: 1;
}
.carousel {
    position: absolute; width: 100%; height: 100%; left: 50%;
    transform-style: preserve-3d; cursor: grab;
}
.carousel:active { cursor: grabbing; }
.card {
    position: absolute; top: 10%; left: 0;
    width: var(--card-width-pc); height: var(--card-height-pc);
    margin-left: calc(var(--card-width-pc) / -2);
    margin-top: calc(var(--card-height-pc) / -2);
    background: white; border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1); overflow: hidden;
    display: flex; align-items: center; justify-content: center;
    backface-visibility: visible; cursor: pointer; transition: transform 0.3s;
}
.card:hover { filter: brightness(1.1); }
.card img { width: 100%; height: 100%; object-fit: cover; pointer-events: none; }

.hero-content {
    position: relative; z-index: 10;
    text-shadow: 0 0 20px rgba(255,255,255,0.8), 0 0 40px rgba(255,255,255,0.8);
    pointer-events: none;
}
.hero-content h2, .hero-content p { pointer-events: auto; }
.hero-title {
    font-family: var(--font-serif); font-size: clamp(3.5rem, 10vw, 7rem);
    font-weight: 600; line-height: 1.2; letter-spacing: -0.02em; margin-bottom: 30px;
}
.hero-title .line { display: block; overflow: hidden; }
.hero-title .line span { display: block; transform: translateY(100%); }
.hero-subtitle, .hero-description { opacity: 0; transform: translateY(20px); display: block; }
.hero-subtitle {
    font-size: 1rem; font-weight: 700; color: var(--color-accent);
    letter-spacing: 0.1em; text-transform: uppercase; margin-left: 5px;
    text-shadow: 0 0 10px rgba(255,255,255,0.8);
}
.hero-description {
    font-size: 1.1rem; font-weight: 500; margin-top: 10px; margin-left: 5px;
    text-shadow: 0 0 10px rgba(255,255,255,0.8);
}
.bg-pattern {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background-image: linear-gradient(rgba(200, 200, 200, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(200, 200, 200, 0.05) 1px, transparent 1px);
    background-size: 40px 40px; z-index: 0; pointer-events: none;
}

/* Mission */
.section-header { margin-bottom: 80px; max-width: 600px; }
.section-label {
    font-size: 0.85rem; font-weight: 700; color: var(--color-accent);
    text-transform: uppercase; letter-spacing: 0.1em; display: block; margin-bottom: 15px;
}
.section-title { font-family: var(--font-serif); font-size: clamp(2rem, 5vw, 3rem); font-weight: 600; line-height: 1.4; }
.mission-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
.mission-card {
    background: #fff; border: 1px solid var(--color-border); padding: 40px;
    border-radius: 8px; transition: transform 0.4s var(--easing), box-shadow 0.4s var(--easing);
    position: relative; overflow: hidden;
}
.mission-card:hover {
    transform: translateY(-10px); box-shadow: 0 20px 40px rgba(0,0,0,0.05); border-color: var(--color-accent);
}
.card-icon {
    width: 50px; height: 50px; background: var(--color-accent); border-radius: 50%;
    display: flex; justify-content: center; align-items: center; margin-bottom: 25px; color: #fff;
}
.card-icon svg { width: 24px; height: 24px; fill: currentColor; }
.mission-card h3 { font-size: 1.5rem; margin-bottom: 15px; font-family: var(--font-serif); }
.mission-card p { color: var(--color-text-light); font-size: 0.95rem; }

/* History */
.history-section {
    background: #0f0f0f; color: #fff; overflow: hidden; position: relative;
    background-image: radial-gradient(#333 1px, transparent 1px); background-size: 30px 30px;
}
.timeline { position: relative; max-width: 1100px; margin: 0 auto; padding: 80px 0; }
.timeline-line {
    position: absolute; top: 0; left: 50%; transform: translateX(-50%);
    width: 2px; height: 0%; background: linear-gradient(180deg, rgba(197, 160, 89, 0) 0%, rgba(197, 160, 89, 0.6) 10%, rgba(197, 160, 89, 0.6) 90%, rgba(197, 160, 89, 0) 100%);
    box-shadow: 0 0 15px rgba(197, 160, 89, 0.3); z-index: 0;
}
.timeline-item {
    display: flex; justify-content: center; align-items: center; margin-bottom: 120px;
    position: relative; opacity: 0;
}
.timeline-item:last-child { margin-bottom: 0; }
.timeline-dot {
    width: 16px; height: 16px; background: #0f0f0f; border: 2px solid var(--color-accent);
    border-radius: 50%; position: absolute; left: 50%; transform: translateX(-50%); z-index: 2;
    box-shadow: 0 0 15px rgba(197, 160, 89, 0.6), inset 0 0 5px rgba(197, 160, 89, 0.4);
}
.timeline-content { width: 45%; padding: 0 40px; position: relative; }
.timeline-item:nth-child(odd) .timeline-content:first-child { text-align: right; margin-right: auto; margin-left: 0; }
.timeline-year {
    position: absolute; top: auto; font-size: 3.5rem; font-weight: 400; color: var(--color-accent);
    line-height: 1; font-family: var(--font-serif); z-index: 0; opacity: 0.3;
    transition: all 0.5s var(--easing); margin-top: -1.2em;
}
.timeline-item:hover .timeline-year { opacity: 0.9; transform: translateY(-5px); text-shadow: 0 0 30px rgba(197, 160, 89, 0.4); }
.timeline-item:nth-child(odd) .timeline-year { right: 0; margin-right: -20px; }
.timeline-item:nth-child(even) .timeline-year { left: 0; margin-left: -20px; }
.timeline-card {
    background: rgba(30, 30, 30, 0.6); padding: 40px; border-radius: 2px;
    border: 1px solid rgba(255, 255, 255, 0.08); position: relative; z-index: 1;
    backdrop-filter: blur(12px); box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    transition: transform 0.4s var(--easing), background 0.4s;
}
.timeline-card:hover {
    background: rgba(40, 40, 40, 0.7); transform: translateY(-5px); border-color: rgba(197, 160, 89, 0.3);
}
.timeline-card::before {
    content: ''; position: absolute; top: 0; width: 3px; height: 100%;
    background: var(--color-accent); opacity: 0.7;
}
.timeline-item:nth-child(odd) { flex-direction: row; }
.timeline-item:nth-child(even) { flex-direction: row-reverse; }
.timeline-item:nth-child(odd) .timeline-card { text-align: right; }
.timeline-item:nth-child(odd) .timeline-card::before { right: 0; left: auto; }
.timeline-item:nth-child(even) .timeline-card { text-align: left; }
.timeline-item:nth-child(even) .timeline-card::before { left: 0; right: auto; }
.timeline-card h4 { font-size: 1.5rem; margin-bottom: 15px; color: #fff; font-family: var(--font-serif); font-weight: 500; }
.timeline-card p { color: #bbb; font-size: 1rem; line-height: 1.8; font-weight: 300; }

/* Message, Ceremony, Contribution, Special */
.message-section { background-color: var(--color-bg-alt); }
.message-container { display: grid; grid-template-columns: 1fr 1.5fr; gap: 60px; align-items: start; }
.message-content {
    background: #fff; padding: 60px; box-shadow: 0 10px 40px rgba(0,0,0,0.03);
    border-radius: 8px; position: relative; overflow: hidden;
}
.president-photo {
    float: right; width: 40%; max-width: 280px; margin-left: 40px; margin-bottom: 20px;
    border-radius: 8px; box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}
.quote-icon {
    position: absolute; top: -20px; left: 40px; font-size: 4rem;
    color: var(--color-accent); font-family: serif; line-height: 1; opacity: 0.3;
}
.ceremony-card {
    background: #fff; border: 1px solid var(--color-border); border-top: 3px solid var(--color-accent);
    padding: 50px; border-radius: 8px; box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center;
}
.ceremony-info dt { font-weight: 700; color: var(--color-accent); margin-bottom: 5px; font-size: 0.9rem; letter-spacing: 0.05em; }
.ceremony-info dd { font-size: 1.1rem; margin-bottom: 25px; font-family: var(--font-serif); }
.ceremony-image { height: 100%; min-height: 300px; border-radius: 4px; overflow: hidden; position: relative; }
.ceremony-image img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s var(--easing); }
.ceremony-image iframe { width: 100%; height: 100%; min-height: 300px; border: 0; }
.ceremony-card:hover .ceremony-image img { transform: scale(1.05); }

.ceremony-action { margin-top: 30px; }
.btn-primary {
    display: inline-flex; align-items: center; justify-content: center; gap: 10px;
    background: var(--color-accent); color: #fff; font-weight: 700; padding: 15px 30px;
    border-radius: 50px; transition: all 0.3s var(--easing); box-shadow: 0 4px 15px rgba(197, 160, 89, 0.3);
    text-align: center; min-width: 280px;
}
.btn-primary:hover {
    background: #d6b36a; transform: translateY(-3px); box-shadow: 0 8px 25px rgba(197, 160, 89, 0.4);
}
.btn-primary svg { transition: transform 0.3s; }
.btn-primary:hover svg { transform: translate(3px, -3px); }
.ceremony-action .note { font-size: 0.8rem; color: #999; margin-top: 8px; margin-left: 10px; }

/* Total Amount & Contribution */
.total-amount-container {
    text-align: center; margin-bottom: 60px; padding: 40px; background: #fff;
    border: 1px solid var(--color-border); border-radius: 8px; border-top: 4px solid var(--color-accent);
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}
.total-label { font-size: 1rem; font-weight: 700; color: var(--color-text-light); margin-bottom: 10px; }
.total-amount-display {
    font-family: var(--font-serif); font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700; color: var(--color-text); line-height: 1; margin-bottom: 20px;
}
.total-amount-display .currency {
    font-size: 1.2rem; font-weight: 700; color: var(--color-text); margin-left: 5px; font-family: var(--font-sans);
}
.sponsors-link {
    display: inline-block; color: var(--color-accent); font-weight: 700; font-size: 0.95rem;
    border-bottom: 1px solid var(--color-accent); padding-bottom: 2px;
}
.sponsors-link:hover { opacity: 0.8; }

.contribution-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.contribution-box { background: #fff; padding: 40px; border-radius: 8px; border: 1px solid var(--color-border); text-align: center; }
.contribution-box h4 {
    font-size: 1.2rem; margin-bottom: 20px; font-family: var(--font-serif);
    color: var(--color-text); display: flex; align-items: center; justify-content: center; gap: 10px;
}
.bank-info { text-align: left; background: var(--color-bg-alt); padding: 20px; border-radius: 4px; font-size: 0.95rem; }
.bank-info table { width: 100%; border-collapse: collapse; }
.bank-info th { text-align: left; padding: 8px 0; color: #666; font-weight: normal; width: 30%; vertical-align: top; }
.bank-info td { font-weight: 700; padding: 8px 0; color: var(--color-text); }
.paypay-qr {
    width: 200px; height: 200px; background: #eee; margin: 0 auto 15px;
    display: flex; align-items: center; justify-content: center; color: #999; font-size: 0.8rem;
}
.paypay-qr img { width: 100%; height: 100%; object-fit: contain; }

/* PayPay Button */
.paypay-link-container { margin-top: 10px; }
.btn-paypay {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    background-color: #FF0033; color: #fff; font-weight: 700; padding: 12px 24px;
    border-radius: 50px; font-size: 0.95rem; box-shadow: 0 4px 12px rgba(255, 0, 51, 0.3);
    transition: all 0.3s var(--easing); width: 100%; max-width: 260px; margin: 0 auto;
}
.btn-paypay:hover {
    transform: translateY(-3px); box-shadow: 0 8px 20px rgba(255, 0, 51, 0.4); background-color: #e6002e;
}
.paypay-link-container .note { font-size: 0.8rem; color: #999; margin-top: 8px; }

.special-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; margin-top: 40px; }
.special-card {
    display: block; background: #fff; border: 1px solid var(--color-border);
    padding: 40px; border-radius: 8px; transition: all 0.3s var(--easing);
    position: relative; overflow: hidden; text-align: center; border-top: 3px solid var(--color-accent);
}
.special-card:hover { transform: translateY(-5px); box-shadow: 0 15px 30px rgba(0,0,0,0.1); background-color: #fcfcfc; }
.special-card h4 { font-size: 1.4rem; font-family: var(--font-serif); margin-bottom: 15px; color: var(--color-text); }
.special-card p { color: var(--color-text-light); font-size: 0.95rem; margin-bottom: 20px; }
.special-link-text {
    display: inline-flex; align-items: center; font-weight: 700;
    color: var(--color-accent); font-size: 0.9rem; letter-spacing: 0.05em;
}
.special-link-text::after { content: '→'; margin-left: 8px; transition: transform 0.3s; }
.special-card:hover .special-link-text::after { transform: translateX(5px); }

/* UI Components */
.back-to-top {
    position: fixed; bottom: 30px; right: 30px; width: 50px; height: 50px;
    background: var(--color-accent); color: #fff; border-radius: 50%;
    display: flex; justify-content: center; align-items: center; cursor: pointer;
    z-index: 999; opacity: 0; visibility: hidden; transform: translateY(20px);
    transition: all 0.3s var(--easing); box-shadow: 0 4px 15px rgba(197, 160, 89, 0.4);
    border: none; outline: none;
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: #d6b36a; transform: translateY(-5px); }
.back-to-top svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

.lightbox {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0, 0, 0, 0.9);
    z-index: 2000; display: flex; justify-content: center; align-items: center;
    opacity: 0; visibility: hidden; transition: opacity 0.3s var(--easing), visibility 0.3s var(--easing);
}
.lightbox.active { opacity: 1; visibility: visible; }
.lightbox-img {
    max-width: 90%; max-height: 90%; object-fit: contain; border-radius: 4px;
    box-shadow: 0 0 50px rgba(0,0,0,0.5); transform: scale(0.9); transition: transform 0.3s var(--easing);
}
.lightbox.active .lightbox-img { transform: scale(1); }
.lightbox-close {
    position: absolute; top: 30px; right: 30px; width: 40px; height: 40px;
    background: rgba(255,255,255,0.1); border-radius: 50%; display: flex; justify-content: center;
    align-items: center; cursor: pointer; transition: background 0.3s;
}
.lightbox-close:hover { background: rgba(255,255,255,0.3); }
.lightbox-close span { display: block; width: 20px; height: 2px; background: #fff; position: absolute; }
.lightbox-close span:first-child { transform: rotate(45deg); }
.lightbox-close span:last-child { transform: rotate(-45deg); }

/* Animation Utility */
.fade-in-up { opacity: 0; }

/* * ==============================================
 * Sub Page Specific Styles (past-presidents.html & sponsors.html)
 * ==============================================
 */
.page-header {
    padding: 200px 0 120px;
    background: radial-gradient(circle at 50% 50%, rgba(197, 160, 89, 0.05) 0%, transparent 70%);
    text-align: center; position: relative; z-index: 1;
}
.page-title {
    font-family: var(--font-serif); font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: 20px; opacity: 0; transform: translateY(30px);
}
.page-subtitle {
    color: var(--color-accent); font-weight: 700; letter-spacing: 0.1em;
    text-transform: uppercase; opacity: 0; transform: translateY(20px);
    display: block; margin-bottom: 10px;
}
.page-description {
    max-width: 600px; margin: 0 auto; color: #666;
    opacity: 0; transform: translateY(20px);
}

.presidents-section { padding-bottom: 150px; }
.president-card { display: flex; align-items: center; gap: 80px; margin-bottom: 150px; position: relative; }
.president-card:nth-child(even) { flex-direction: row-reverse; }

.president-image-wrapper { flex: 1; max-width: 450px; position: relative; }
.img-reveal {
    overflow: hidden; border-radius: 4px; position: relative; width: 100%;
    aspect-ratio: 3 / 4; box-shadow: 0 20px 50px rgba(0,0,0,0.1);
}
.img-reveal img {
    width: 100%; height: 100%; object-fit: cover;
    transform: scale(1.4); filter: grayscale(10%); transition: filter 0.5s;
}
.president-card:hover .img-reveal img { filter: grayscale(0%); }

.deco-frame {
    position: absolute; top: -20px; left: -20px; width: 100%; height: 100%;
    border: 2px solid var(--color-accent); z-index: -1; opacity: 0.6; pointer-events: none;
}
.president-card:nth-child(even) .deco-frame { left: auto; right: -20px; }

.president-content { flex: 1.2; opacity: 0; transform: translateY(30px); }
.term-label {
    display: inline-block; background: var(--color-accent); color: #fff;
    padding: 4px 12px; font-size: 0.8rem; font-weight: 700; margin-bottom: 20px; border-radius: 20px;
}
.president-name {
    font-family: var(--font-serif); font-size: clamp(1.8rem, 3vw, 2.5rem);
    margin-bottom: 15px; display: flex; flex-direction: column; line-height: 1.2;
}
.president-name span {
    font-size: 1rem; font-family: var(--font-sans); color: var(--color-accent);
    font-weight: 700; margin-top: 5px; letter-spacing: 0.05em; text-transform: uppercase;
}
.message-title {
    font-size: 1.25rem; font-weight: 700; margin-bottom: 25px; color: var(--color-text);
    padding-left: 0; border-bottom: 1px solid var(--color-border); padding-bottom: 15px; display: inline-block;
}
.message-body { color: var(--color-text-light); line-height: 2; text-align: justify; font-size: 1rem; }

/* Sponsors Page */
.sponsors-section { padding-bottom: 150px; }
.sponsor-group { margin-bottom: 80px; }
.sponsor-rank-title {
    text-align: center; font-family: var(--font-serif); font-size: 1.8rem;
    margin-bottom: 40px; position: relative; padding-bottom: 15px;
}
.sponsor-rank-title::after {
    content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%);
    width: 60px; height: 3px; background: var(--color-accent);
}
.gold-sponsors .sponsor-rank-title { color: #d4af37; } /* Gold */
.gold-sponsors .sponsor-rank-title::after { background: #d4af37; }
.silver-sponsors .sponsor-rank-title { color: #888; } /* Silver */
.silver-sponsors .sponsor-rank-title::after { background: #888; }

.sponsor-list {
    display: flex; flex-wrap: wrap; justify-content: center; gap: 20px;
    max-width: 900px; margin: 0 auto;
}
.sponsor-list li {
    font-family: var(--font-serif); font-weight: 500;
    opacity: 0; transform: translateY(10px);
}
/* Gold Sponsors: Large */
.gold-sponsors .sponsor-list li {
    font-size: 1.4rem; width: 45%; text-align: center; padding: 10px; border-bottom: 1px solid #eee;
}
/* Silver Sponsors: Small */
.silver-sponsors .sponsor-list li {
    font-size: 1rem; width: 30%; text-align: center; padding: 5px;
}

/* * ==============================================
 * Responsive
 * ==============================================
 */
@media (max-width: 1024px) {
    :root { --header-height: 60px; }
    .nav-toggle { display: flex; }
    
    /* Top Page Mobile */
    .main-nav {
        position: fixed; top: 0; right: -100%; width: 80%; height: 100vh;
        background: #fff; z-index: 1000; padding: 100px 40px;
        transition: right 0.4s var(--easing); box-shadow: -10px 0 30px rgba(0,0,0,0.1);
    }
    .main-nav.active { right: 0; }
    .main-nav ul { flex-direction: column; gap: 30px; }
    .main-nav a { font-size: 1.2rem; color: var(--color-text); }
    .hero-section { align-items: flex-end; padding-bottom: 160px; }
    .hero-title { font-size: 3rem; }
    .card {
        width: var(--card-width-sp); height: var(--card-height-sp);
        margin-left: calc(var(--card-width-sp) / -2); margin-top: calc(var(--card-height-sp) / -2);
    }
    .sticky-grid, .message-container, .ceremony-card, .contribution-grid { grid-template-columns: 1fr; gap: 40px; }
    .president-photo { float: none; display: block; width: 100%; max-width: 320px; margin: 0 auto 30px; }
    .ceremony-image { min-height: 200px; order: -1; }
    .timeline-line { left: 20px; }
    .timeline-item, .timeline-item:nth-child(odd), .timeline-item:nth-child(even) {
        flex-direction: column; align-items: flex-start; padding-left: 60px; margin-bottom: 80px;
    }
    .timeline-dot { left: 20px; transform: translateX(-50%); }
    .timeline-content, .timeline-item:nth-child(odd) .timeline-content, .timeline-item:nth-child(even) .timeline-content {
        width: 100%; text-align: left; padding: 0;
    }
    .timeline-year, .timeline-item:nth-child(odd) .timeline-year, .timeline-item:nth-child(even) .timeline-year {
        position: relative; top: auto; left: auto; right: auto; margin: 0 0 10px -20px;
        font-size: 2.5rem; opacity: 0.8; text-align: left;
    }
    .timeline-card, .timeline-item:nth-child(odd) .timeline-card, .timeline-item:nth-child(even) .timeline-card {
        text-align: left; border-left: none;
    }
    .timeline-item:nth-child(odd) .timeline-card::before, .timeline-item:nth-child(even) .timeline-card::before { left: 0; right: auto; }
    .footer-top { flex-direction: column; gap: 30px; text-align: center; }
    .footer-links a { margin-left: 0; display: block; margin-bottom: 10px; }

    /* Sub Page Mobile */
    .page-header { padding: 150px 0 80px; }
    .president-card, .president-card:nth-child(even) {
        flex-direction: column; gap: 40px; margin-bottom: 100px;
    }
    .president-image-wrapper { width: 100%; max-width: 100%; margin: 0 auto; padding: 0 20px; }
    .img-reveal { aspect-ratio: 4 / 3; }
    .president-content { width: 100%; padding: 0 20px; }
    .president-name { flex-direction: row; align-items: baseline; gap: 10px; flex-wrap: wrap; }
    .deco-frame { display: none; }
    
    /* Sponsors Mobile */
    .gold-sponsors .sponsor-list li { width: 100%; font-size: 1.2rem; }
    .silver-sponsors .sponsor-list li { width: 45%; font-size: 0.9rem; }
}