/* ===================================
   第66回日本臨床化学会年次学術集会
   Elegant Design System
   =================================== */

:root {
    --gold-light: #F5E6D3;
    --gold: #C9A962;
    --gold-dark: #8B7355;
    --charcoal: #2C2C2C;
    --charcoal-light: #3D3330;
    --warm-white: #FDFBF7;
    --warm-gray: #E8E4DE;
    --warm-beige: #F5EDE0;
    --text-primary: #1A1A1A;
    --text-secondary: #5A5A5A;
    --text-muted: #8A8A8A;
    --sidebar-width: 310px;
    --mobile-sidebar-width: 330px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Serif JP', serif;
    background: var(--warm-white);
    color: var(--text-primary);
    line-height: 1.8;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* ===================================
   Top Header Bar
   =================================== */
.top-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 80px;
    background: #000000;
    border-bottom: 1px solid var(--gold);
    box-shadow:
        0 4px 30px rgba(0, 0, 0, 0.6),
        0 1px 0 rgba(255, 255, 255, 0.02) inset,
        0 -20px 40px rgba(201, 169, 98, 0.02) inset;
    z-index: 1001;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    gap: 1.5rem;
    padding: 0 2.5rem;
    overflow: hidden;
}

.top-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        linear-gradient(135deg,
            rgba(255, 255, 255, 0.02) 0%,
            rgba(255, 255, 255, 0.01) 30%,
            transparent 50%,
            rgba(0, 0, 0, 0.1) 100%
        );
    pointer-events: none;
    z-index: 1;
}

.top-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg,
        transparent 0%,
        var(--gold-dark) 15%,
        var(--gold) 50%,
        var(--gold-dark) 85%,
        transparent 100%
    );
    opacity: 0.3;
    box-shadow:
        0 0 8px rgba(201, 169, 98, 0.2),
        0 0 15px rgba(201, 169, 98, 0.1);
}

.header-gloss-layer,
.header-reflection,
.header-depth-layer,
.header-highlight,
.header-edge-glow {
    position: absolute;
    pointer-events: none;
}

.header-reflection {
    top: 0;
    left: 0;
    right: 0;
    height: 50%;
    background: linear-gradient(180deg,
        rgba(255, 255, 255, 0.06) 0%,
        rgba(255, 255, 255, 0.02) 50%,
        transparent 100%
    );
    z-index: 1;
}

.header-depth-layer {
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse 80% 50% at 20% 50%, rgba(201, 169, 98, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse 60% 40% at 80% 50%, rgba(201, 169, 98, 0.05) 0%, transparent 50%);
    z-index: 0;
}

.header-highlight {
    top: 2px;
    left: 10%;
    right: 10%;
    height: 1px;
    background: linear-gradient(90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.15) 20%,
        rgba(255, 255, 255, 0.25) 50%,
        rgba(255, 255, 255, 0.15) 80%,
        transparent 100%
    );
    z-index: 3;
}

.header-edge-glow {
    bottom: 3px;
    left: 0;
    right: 0;
    height: 20px;
    background: linear-gradient(180deg,
        transparent 0%,
        rgba(201, 169, 98, 0.05) 50%,
        rgba(201, 169, 98, 0.15) 100%
    );
    z-index: 1;
    filter: blur(4px);
}

.header-logo-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    text-decoration: none;
    position: relative;
    z-index: 10;
}

.top-header-titles {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    position: relative;
    z-index: 10;
}

.top-header-title {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 1.5rem;
    letter-spacing: 0.06em;
    color: var(--gold-light);
    font-weight: 900;
    text-shadow:
        0 2px 4px rgba(0, 0, 0, 0.5),
        0 0 30px rgba(201, 169, 98, 0.4),
        0 0 50px rgba(212, 175, 55, 0.2);
    position: relative;
}

.title-sm {
    font-size: 0.75em;
    font-weight: 500;
}

.top-header-subtitle {
    font-family: 'Cormorant Garamond', serif;
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    color: #ffffff;
    font-style: italic;
    font-weight: 500;
    text-shadow: 0 2px 3px rgba(0, 0, 0, 0.4);
}

/* ===================================
   Left Sidebar Navigation
   =================================== */
.sidebar {
    position: fixed;
    top: 80px;
    left: 0;
    width: var(--sidebar-width);
    height: calc(100vh - 80px);
    background: linear-gradient(180deg, #0a0a0a 0%, #000000 50%, #0a0a0a 100%);
    border-right: 1px solid var(--gold);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    padding: 2rem 0;
    overflow-y: auto;
}

.sidebar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    background: radial-gradient(ellipse at 0% 30%,
        rgba(201, 169, 98, 0.08) 0%,
        transparent 60%);
    pointer-events: none;
}

.nav-links {
    display: flex;
    flex-direction: column;
    padding: 1.5rem 0;
    list-style: none;
    position: relative;
    z-index: 1;
}

.nav-links li {
    position: relative;
}

.nav-links a {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 1rem 2rem;
    text-decoration: none;
    color: rgba(250, 248, 244, 0.95);
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    position: relative;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-icon {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--gold-dark);
    opacity: 0.4;
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.nav-links a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 3px;
    height: 100%;
    background: linear-gradient(180deg, var(--gold-dark), var(--gold));
    transform: scaleY(0);
    transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    border-radius: 0 2px 2px 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, rgba(201, 169, 98, 0.15), transparent);
    opacity: 0;
    transition: opacity 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-links a:hover {
    color: var(--gold-light);
    padding-left: 2.5rem;
}

.nav-links a:hover .nav-icon {
    width: 12px;
    height: 12px;
    opacity: 1;
    background:
        radial-gradient(ellipse 60% 40% at 30% 25%, rgba(255, 255, 255, 0.5) 0%, transparent 50%),
        radial-gradient(ellipse 40% 30% at 70% 75%, rgba(0, 0, 0, 0.2) 0%, transparent 50%),
        radial-gradient(circle at 35% 35%, #E8D5A3 0%, #C9A962 30%, #967B4D 70%, #6B5A3E 100%);
    box-shadow:
        0 2px 4px rgba(0, 0, 0, 0.3),
        inset 0 1px 2px rgba(255, 255, 255, 0.3),
        inset 0 -1px 2px rgba(0, 0, 0, 0.2);
}

.nav-links a:hover::before {
    transform: scaleY(1);
}

.nav-links a:hover::after {
    opacity: 1;
}

.nav-links a.active {
    color: var(--gold);
}

.nav-links a.active .nav-icon {
    opacity: 1;
    background: var(--gold);
}

.nav-links a.active::before {
    transform: scaleY(1);
}

.sidebar-poster {
    padding: 1.5rem;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-poster-title {
    font-size: 1.15rem;
    font-weight: 400;
    letter-spacing: 0.15em;
    color: var(--gold);
    margin-bottom: 1rem;
}

.sidebar-poster-img {
    width: 100%;
    border-radius: 4px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.sidebar-poster-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    margin-top: 1rem;
    padding: 0.5rem 1.2rem;
    font-size: 1.05rem;
    color: var(--warm-white);
    background: var(--gold-dark);
    border-radius: 4px;
    text-decoration: none;
    letter-spacing: 0.08em;
    transition: background 0.3s ease;
}

.sidebar-poster-btn:hover {
    background: var(--gold);
}

/* ===================================
   Main Content Area
   =================================== */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    min-height: max(100vh, 900px);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 10rem 3rem 6rem;
}

/* Ensure hero-info positions relative to hero section */
.hero > .hero-info {
    position: absolute;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('../images/hero-bg.webp');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.hero-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.15) 40%, rgba(0, 0, 0, 0.5) 100%);
    pointer-events: none;
}

.hero-organic-shapes {
    display: none;
}

.organic-shape {
    position: absolute;
    border-radius: 60% 40% 70% 30% / 60% 30% 70% 40%;
    opacity: 0.15;
    animation: morphShape 20s cubic-bezier(0.45, 0.05, 0.55, 0.95) infinite;
}

.shape-1 {
    width: 500px;
    height: 500px;
    background: linear-gradient(135deg, #F4D89F, #E8C4A0, var(--gold));
    top: -100px;
    right: -100px;
    animation-delay: 0s;
}

.shape-2 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, #FFF0F5, #FFE4E1, var(--gold-light));
    bottom: -50px;
    left: -50px;
    animation-delay: -7s;
}

.shape-3 {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, #F5DEB3, #F4C2C2, var(--gold));
    top: 50%;
    right: 10%;
    animation-delay: -14s;
}

@keyframes morphShape {
    0%, 100% {
        border-radius: 60% 40% 70% 30% / 60% 30% 70% 40%;
        transform: rotate(0deg) scale(1);
    }
    25% {
        border-radius: 40% 60% 30% 70% / 50% 60% 40% 50%;
        transform: rotate(45deg) scale(1.05);
    }
    50% {
        border-radius: 50% 50% 40% 60% / 40% 50% 60% 50%;
        transform: rotate(180deg) scale(1.1);
    }
    75% {
        border-radius: 70% 30% 50% 50% / 60% 40% 60% 40%;
        transform: rotate(270deg) scale(1.05);
    }
}

.hero-text-wrapper {
    position: absolute;
    top: 8rem;
    bottom: 8rem;
    left: 0;
    right: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 25;
    pointer-events: none;
}

.hero-vertical-text {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.05em;
    opacity: 0;
    animation: emergefromDepth 2.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards 0.2s;
    filter: blur(0);
    transform-style: preserve-3d;
    perspective: 1000px;
}

.hero-vertical-text span {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: clamp(2rem, min(6vw, 6vh), 5rem);
    font-weight: 700;
    color: #ffffff;
    line-height: 1;
    text-shadow:
        0 0 8px rgba(255, 0, 0, 1),
        0 0 15px rgba(255, 0, 0, 1),
        0 0 25px rgba(255, 0, 0, 0.9),
        0 0 40px rgba(255, 0, 0, 0.8),
        0 0 60px rgba(255, 0, 0, 0.6),
        0 0 80px rgba(255, 0, 0, 0.4),
        2px 2px 3px rgba(0, 0, 0, 0.5),
        -1px -1px 2px rgba(255, 255, 255, 0.3);
}

@keyframes emergefromDepth {
    0% {
        opacity: 0;
        transform: scale(0.3) translateZ(-500px);
        filter: blur(20px);
        text-shadow:
            0 0 50px rgba(255, 0, 0, 1),
            0 0 100px rgba(255, 0, 0, 1),
            0 0 150px rgba(255, 0, 0, 0.8);
    }
    50% {
        opacity: 0.8;
        filter: blur(3px);
        text-shadow:
            0 0 35px rgba(255, 0, 0, 1),
            0 0 70px rgba(255, 0, 0, 0.9),
            0 0 105px rgba(255, 0, 0, 0.7);
    }
    100% {
        opacity: 1;
        transform: scale(1) translateZ(0);
        filter: blur(0);
        text-shadow:
            0 0 8px rgba(255, 0, 0, 1),
            0 0 15px rgba(255, 0, 0, 1),
            0 0 25px rgba(255, 0, 0, 0.9),
            0 0 40px rgba(255, 0, 0, 0.8),
            0 0 60px rgba(255, 0, 0, 0.6),
            0 0 80px rgba(255, 0, 0, 0.4),
            2px 2px 3px rgba(0, 0, 0, 0.5),
            -1px -1px 2px rgba(255, 255, 255, 0.3);
    }
}

.hero-accent-text {
    position: absolute;
    top: 25%;
    left: 48%;
    transform: translate(-50%, -50%);
    margin-left: clamp(4rem, min(10vw, 10vh), 8rem);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
    z-index: 26;
    opacity: 0;
    animation: accentFadeIn 1s cubic-bezier(0.34, 1.56, 0.64, 1) forwards 2.7s;
}

.hero-accent-text span {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: clamp(2rem, min(6vw, 6vh), 5rem);
    font-weight: 700;
    color: #ffffff;
    line-height: 1;
    text-shadow:
        0 0 10px rgba(0, 255, 0, 0.8),
        0 0 20px rgba(0, 255, 0, 0.6),
        0 0 30px rgba(0, 255, 0, 0.4),
        0 0 40px rgba(0, 255, 0, 0.3),
        2px 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-accent-text span:nth-child(2) {
    display: inline-block;
    transform: rotate(30deg);
}

@keyframes accentFadeIn {
    0% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.5);
        filter: blur(10px);
    }
    50% {
        opacity: 0.7;
        filter: blur(2px);
    }
    100% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
        filter: blur(0);
    }
}

.hero-content {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 10;
    text-align: center;
    background: linear-gradient(0deg,
        rgba(0, 0, 0, 0) 0%,
        rgba(0, 0, 0, 0.3) 30%,
        rgba(0, 0, 0, 0.75) 100%);
    padding: calc(80px + 1rem) 2rem 1.5rem;
}

.hero-title {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: clamp(2.2rem, 5vw, 3.4rem);
    font-weight: 900;
    letter-spacing: 0.12em;
    color: #ffffff;
    margin-bottom: 1rem;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeUp 1s cubic-bezier(0.4, 0, 0.2, 1) forwards 0.3s;
    line-height: 1.6;
    white-space: nowrap;
    text-shadow:
        0 0 20px rgba(201, 169, 98, 0.3),
        0 2px 4px rgba(0, 0, 0, 0.8),
        0 4px 12px rgba(0, 0, 0, 0.5);
    -webkit-text-stroke: 0.5px rgba(201, 169, 98, 0.2);
}

.hero-subtitle {
    font-family: 'Cormorant Garamond', serif;
    font-size: clamp(0.9rem, 1.5vw, 1.1rem);
    font-weight: 400;
    letter-spacing: 0.18em;
    color: #ffffff;
    font-style: italic;
    margin-bottom: 0.3rem;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeUp 1s cubic-bezier(0.4, 0, 0.2, 1) forwards 0.5s;
    line-height: 1.8;
}

.hero-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin: 2.5rem 0;
    opacity: 0;
    animation: fadeUp 1s ease forwards 0.7s;
}

.hero-divider::before,
.hero-divider::after {
    content: '';
    width: 60px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--gold));
}

.hero-divider::after {
    background: linear-gradient(90deg, var(--gold), transparent);
}

.divider-leaf {
    width: 12px;
    height: 18px;
    background: var(--gold-dark);
    border-radius: 0 100% 0 100%;
    transform: rotate(45deg);
}

.hero-info {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    opacity: 0;
    animation: fadeUpInfo 1s ease forwards 3.8s;
    z-index: 20;
}

@keyframes fadeUpInfo {
    to {
        opacity: 1;
    }
}

@keyframes flashGlow {
    0%, 100% {
        filter: brightness(1);
        box-shadow: none;
    }
    50% {
        filter: brightness(1.5);
        box-shadow:
            0 0 30px rgba(212, 175, 55, 0.8),
            0 0 50px rgba(212, 175, 55, 0.6),
            inset 0 0 30px rgba(212, 175, 55, 0.3);
    }
}

@keyframes textFlash {
    0%, 100% {
        text-shadow: none;
    }
    50% {
        text-shadow:
            0 0 15px rgba(255, 255, 255, 1),
            0 0 30px rgba(212, 175, 55, 0.8),
            0 0 45px rgba(212, 175, 55, 0.6);
    }
}

.info-card-unified {
    background: linear-gradient(180deg,
        rgba(0, 0, 0, 0) 0%,
        rgba(0, 0, 0, 0.7) 30%,
        rgba(0, 0, 0, 0.95) 100%);
    padding: 3rem 2rem 2.5rem;
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: flex-start;
    gap: 3rem;
    width: 100%;
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    text-align: center;
    transition: transform 0.3s ease, filter 0.3s ease;
    cursor: default;
    filter: brightness(1.4) drop-shadow(0 0 20px rgba(201, 169, 98, 0.8)) drop-shadow(0 0 40px rgba(212, 175, 55, 0.4));
}

.info-item:hover {
    transform: translateY(-5px);
    filter: brightness(1.6) drop-shadow(0 0 30px rgba(201, 169, 98, 1)) drop-shadow(0 0 50px rgba(212, 175, 55, 0.6));
}

a.info-item-link {
    text-decoration: none;
    color: inherit;
    cursor: pointer;
}

.info-item-1 {
    animation: elegantGlow 1.8s ease-in-out 4s;
}

.info-item-2 {
    animation: elegantGlow 1.8s ease-in-out 6s;
}

.info-item-3 {
    animation: elegantGlow 1.8s ease-in-out 8s;
}

.info-divider {
    width: 1px;
    height: 50px;
    background: linear-gradient(180deg, transparent, var(--gold), transparent);
    align-self: center;
}

.info-label {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 1.7rem;
    font-weight: 900;
    letter-spacing: 0.15em;
    color: #ffffff;
    text-transform: uppercase;
    text-shadow: 0 0 15px rgba(201, 169, 98, 0.6), 0 2px 8px rgba(0, 0, 0, 0.8);
    animation: textFlash 0.8s ease-in-out 3.8s;
    margin-bottom: 0.3rem;
}

.info-main {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 1.8rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: #ffffff;
    line-height: 1.5;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.8), 0 0 20px rgba(0, 0, 0, 0.5);
}

.info-sub {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 1.25rem;
    letter-spacing: 0.05em;
    color: rgba(245, 230, 211, 0.95);
    line-height: 1.5;
    text-shadow: 0 1px 8px rgba(0, 0, 0, 0.8);
}

@keyframes fadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes highlightGlow {
    0% {
        filter: brightness(1);
        transform: scale(1);
    }
    50% {
        filter: brightness(1.4) drop-shadow(0 0 20px rgba(212, 175, 55, 0.8));
        transform: scale(1.05);
    }
    100% {
        filter: brightness(1);
        transform: scale(1);
    }
}

@keyframes elegantGlow {
    0% {
        filter: brightness(1);
    }
    20% {
        filter: brightness(1.1);
    }
    35% {
        filter: brightness(1.3) drop-shadow(0 0 10px rgba(201, 169, 98, 0.3));
    }
    50% {
        filter: brightness(1.8) drop-shadow(0 0 25px rgba(255, 223, 128, 0.7)) drop-shadow(0 0 50px rgba(201, 169, 98, 0.5));
    }
    60% {
        filter: brightness(1.5) drop-shadow(0 0 20px rgba(255, 223, 128, 0.5)) drop-shadow(0 0 40px rgba(201, 169, 98, 0.3));
    }
    75% {
        filter: brightness(1.2) drop-shadow(0 0 10px rgba(201, 169, 98, 0.2));
    }
    100% {
        filter: brightness(1);
    }
}

.scroll-indicator {
    position: absolute;
    /* ヒーローがビューポートより大きい場合、矢印を上に移動 */
    bottom: max(8rem, calc(100% - 100vh + 5rem));
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 30;
    opacity: 0;
    animation: fadeInBounce 1s ease forwards 3.5s;
}

@keyframes fadeInBounce {
    0% {
        opacity: 0;
        transform: translateX(-50%) translateY(-20px);
    }
    60% {
        opacity: 1;
        transform: translateX(-50%) translateY(5px);
    }
    100% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

.scroll-indicator:hover {
    transform: translateX(-50%) translateY(-5px);
}

.scroll-indicator:hover span {
    color: var(--gold);
}

.scroll-indicator:hover .scroll-arrow {
    color: var(--gold);
    animation: bounceArrow 0.6s ease infinite;
}

.scroll-indicator span {
    font-family: 'Noto Serif JP', serif;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.3em;
    color: rgba(255, 255, 255, 0.9);
    transition: color 0.3s ease;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.scroll-arrow {
    width: 28px;
    height: 28px;
    color: rgba(255, 255, 255, 0.9);
    transition: all 0.3s ease;
    animation: bounceArrow 2s ease-in-out infinite;
    filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.3));
}

@keyframes bounceArrow {
    0%, 100% {
        transform: translateY(0);
        opacity: 0.8;
    }
    50% {
        transform: translateY(8px);
        opacity: 1;
    }
}

/* ===================================
   News Section
   =================================== */
.news-section {
    padding: 6rem 3rem;
    background: linear-gradient(135deg,
        #f5f0e6 0%,
        #ebe4d5 50%,
        #f0e9db 100%);
    position: relative;
}

.news-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg,
        transparent 0%,
        var(--gold) 20%,
        var(--gold) 80%,
        transparent 100%);
    opacity: 0.2;
    z-index: 2;
}

.news-section::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(218, 165, 32, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(218, 165, 32, 0.08) 0%, transparent 50%);
    pointer-events: none;
    z-index: 1;
}

.news-wrapper {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
}

.section-header::before {
    content: '';
    position: absolute;
    top: -2rem;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--gold), transparent);
    opacity: 0.5;
}

.section-icon {
    width: 40px;
    height: 40px;
    margin: 0 auto 1rem;
    border: 2px solid var(--gold-dark);
    border-radius: 50%;
    position: relative;
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.section-icon::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 8px;
    height: 8px;
    background: var(--gold);
    border-radius: 50%;
}

.section-icon::after {
    content: '';
    position: absolute;
    top: -5px;
    left: -5px;
    right: -5px;
    bottom: -5px;
    border: 1px solid var(--gold);
    border-radius: 50%;
    opacity: 0.2;
}

.news-title {
    font-size: 1.5rem;
    font-weight: 400;
    letter-spacing: 0.2em;
    color: var(--charcoal);
    margin-bottom: 0.5rem;
}

.section-subtitle {
    font-family: 'Cormorant Garamond', serif;
    font-size: 0.85rem;
    color: var(--text-muted);
    letter-spacing: 0.15em;
    font-style: italic;
}

.news-list {
    list-style: none;
}

.news-item {
    display: flex;
    gap: 2rem;
    padding: 1.5rem;
    border: 1px solid var(--warm-beige);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.5);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    margin-bottom: 1rem;
    position: relative;
}

.news-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--gold-dark), var(--gold));
    border-radius: 12px 0 0 12px;
    transform: scaleY(0);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.news-item:hover {
    background: rgba(255, 255, 255, 0.95);
    border-color: var(--gold);
    transform: translateX(8px);
    box-shadow: 0 12px 35px rgba(44, 44, 44, 0.12);
}

.news-item:hover::before {
    transform: scaleY(1);
}

.news-date-wrapper {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    flex-shrink: 0;
}

.news-date {
    font-family: 'Cormorant Garamond', serif;
    font-size: 1.05rem;
    color: var(--gold-dark);
    letter-spacing: 0.05em;
}

.news-badge {
    font-size: 0.6rem;
    padding: 0.2rem 0.6rem;
    background: linear-gradient(135deg, var(--gold-dark), var(--gold));
    color: var(--warm-white);
    border-radius: 100px;
    letter-spacing: 0.1em;
    position: relative;
    overflow: hidden;
    animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.85; }
}

.news-text {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ===================================
   Footer
   =================================== */
footer {
    padding: 4rem 3rem;
    background: linear-gradient(180deg, #050505 0%, #000000 50%, #050505 100%);
    border-top: 1px solid var(--gold);
    position: relative;
    overflow: hidden;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    background: radial-gradient(ellipse at 50% 0%,
        rgba(201, 169, 98, 0.08) 0%,
        transparent 60%);
    pointer-events: none;
}

.footer-content {
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

.footer-logo {
    font-size: 0.9rem;
    letter-spacing: 0.15em;
    color: var(--gold-light);
    margin-bottom: 2rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
    list-style: none;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.footer-links a {
    font-size: 0.8rem;
    color: var(--warm-gray);
    text-decoration: none;
    letter-spacing: 0.1em;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.footer-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--gold);
    transition: width 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.footer-links a:hover {
    color: var(--gold);
}

.footer-links a:hover::after {
    width: 100%;
}

.social-share {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 1.5rem 0;
}

.social-label {
    font-size: 0.85rem;
    color: var(--warm-gray);
    letter-spacing: 0.1em;
}

.social-buttons {
    display: flex;
    gap: 0.75rem;
}

.social-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(201, 169, 98, 0.1);
    border: 1px solid rgba(201, 169, 98, 0.3);
    transition: all 0.3s ease;
    text-decoration: none;
}

.social-btn svg {
    width: 18px;
    height: 18px;
    color: var(--gold-light);
    transition: all 0.3s ease;
}

.social-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(201, 169, 98, 0.3);
}

.twitter-btn:hover {
    background: rgba(29, 161, 242, 0.2);
    border-color: rgba(29, 161, 242, 0.5);
}

.twitter-btn:hover svg {
    color: #1DA1F2;
}

.facebook-btn:hover {
    background: rgba(24, 119, 242, 0.2);
    border-color: rgba(24, 119, 242, 0.5);
}

.facebook-btn:hover svg {
    color: #1877F2;
}

.email-btn:hover {
    background: rgba(201, 169, 98, 0.3);
    border-color: var(--gold);
}

.email-btn:hover svg {
    color: var(--gold);
}

.copyright {
    padding-top: 2rem;
    border-top: 1px solid rgba(201, 169, 98, 0.2);
    font-size: 0.7rem;
    color: var(--gold-dark);
    letter-spacing: 0.08em;
}

/* ===================================
   Mobile Menu Button
   =================================== */
.mobile-menu-btn {
    display: none;
    position: fixed;
    top: 90px;
    left: 1.5rem;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #1a1a1a 0%, #000000 70%, #1a1a1a 100%);
    border: 2px solid var(--gold);
    border-radius: 50%;
    cursor: pointer;
    z-index: 1001;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    box-shadow:
        0 4px 12px rgba(0, 0, 0, 0.6),
        0 2px 4px rgba(0, 0, 0, 0.3),
        inset 0 1px 2px rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
    opacity: 0.8;
}

.mobile-menu-btn:hover {
    transform: scale(1.05);
    opacity: 0.9;
}

.mobile-menu-btn span {
    width: 18px;
    height: 2px;
    background: linear-gradient(180deg, var(--gold-light) 0%, var(--gold) 100%);
    transition: all 0.3s ease;
    border-radius: 2px;
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: translate(0, 6px) rotate(45deg);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: translate(0, -6px) rotate(-45deg);
}

/* ===================================
   Back to Top Button
   =================================== */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--gold) 0%, var(--gold-dark) 100%);
    border: 2px solid var(--gold);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s ease;
    z-index: 1000;
    box-shadow: 0 4px 15px rgba(201, 169, 98, 0.3);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 25px rgba(201, 169, 98, 0.5);
    background: linear-gradient(135deg, var(--gold-dark) 0%, var(--gold) 100%);
}

.back-to-top svg {
    width: 24px;
    height: 24px;
    color: var(--charcoal);
    transition: transform 0.3s ease;
}

.back-to-top:hover svg {
    transform: translateY(-2px);
}

/* ===================================
   Reveal Animations
   =================================== */
.reveal {
    opacity: 0;
    transform: translateY(50px);
    transition: all 1s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* ===================================
   Page Header (for sub pages)
   =================================== */
.page-header {
    position: relative;
    padding: calc(80px + 2rem) 3rem 2rem;
    background: linear-gradient(180deg, #000000 0%, #1a1a1a 100%);
    text-align: center;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at 30% 50%, rgba(201, 169, 98, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 50%, rgba(201, 169, 98, 0.08) 0%, transparent 50%);
    pointer-events: none;
}

.page-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

.page-header-content {
    position: relative;
    z-index: 1;
}

.page-title {
    font-size: clamp(1.3rem, 3vw, 1.8rem);
    font-weight: 400;
    letter-spacing: 0.25em;
    color: var(--gold-light);
    margin-bottom: 0.3rem;
}

.page-subtitle {
    font-family: 'Cormorant Garamond', serif;
    font-size: 0.85rem;
    letter-spacing: 0.12em;
    color: rgba(255, 255, 255, 0.5);
    font-style: italic;
}

/* ===================================
   Greeting Section
   =================================== */
.greeting-section {
    padding: 5rem 3rem;
    background: linear-gradient(135deg,
        #f5f0e6 0%,
        #ebe4d5 50%,
        #f0e9db 100%);
    position: relative;
}

.greeting-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(218, 165, 32, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(218, 165, 32, 0.08) 0%, transparent 50%);
    pointer-events: none;
}

.greeting-wrapper {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.greeting-header {
    text-align: center;
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid rgba(201, 169, 98, 0.3);
}

.greeting-title {
    font-size: 1.5rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    color: var(--charcoal);
    margin-bottom: 0.5rem;
}

.greeting-subtitle {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-secondary);
    letter-spacing: 0.1em;
}

.greeting-author {
    margin-top: 1.5rem;
    text-align: right;
}

.author-role {
    font-size: 0.9rem;
    color: var(--text-secondary);
    letter-spacing: 0.08em;
    margin-bottom: 0.3rem;
}

.author-name {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--charcoal);
    letter-spacing: 0.15em;
    margin-bottom: 0.2rem;
}

.author-affiliation {
    font-size: 0.95rem;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
}

.greeting-content {
    overflow: hidden;
}

.greeting-photo-wrapper {
    float: right;
    margin: 0 0 1.5rem 2rem;
}

.greeting-photo {
    width: 180px;
    height: auto;
    border-radius: 4px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    image-rendering: auto;
    filter: contrast(1.02) brightness(1.02);
}

.greeting-text {
    line-height: 2.2;
    color: var(--text-primary);
}

.greeting-text p {
    margin-bottom: 1.8rem;
    text-align: justify;
    text-indent: 1em;
}

.greeting-text ruby {
    ruby-position: over;
}

.greeting-text rt {
    font-size: 0.6em;
    color: var(--text-muted);
}

.greeting-signature {
    clear: both;
    text-align: right;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(201, 169, 98, 0.3);
}

.signature-role {
    font-size: 0.95rem;
    color: var(--text-secondary);
    letter-spacing: 0.08em;
    line-height: 1.8;
    margin-bottom: 0.5rem;
}

.signature-name {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--charcoal);
    letter-spacing: 0.15em;
    margin-bottom: 0.3rem;
}

.signature-affiliation {
    font-size: 1rem;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
}

@media (max-width: 768px) {
    .page-header {
        padding: calc(70px + 1.5rem) 1.5rem 1.5rem;
    }

    .greeting-section {
        padding: 3rem 1.5rem;
    }

    .greeting-photo-wrapper {
        float: none;
        text-align: center;
        margin: 0 0 2rem 0;
    }

    .greeting-photo {
        width: 150px;
    }

    .greeting-text {
        line-height: 2;
    }

    .greeting-text p {
        margin-bottom: 1.5rem;
    }

    .greeting-signature {
        margin-top: 2rem;
        padding-top: 1.5rem;
    }

    .signature-name {
        font-size: 1.5rem;
    }
}

/* ===================================
   Overview Section
   =================================== */
.overview-section {
    padding: 5rem 3rem;
    background: linear-gradient(135deg,
        #f5f0e6 0%,
        #ebe4d5 50%,
        #f0e9db 100%);
    position: relative;
}

.overview-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(218, 165, 32, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(218, 165, 32, 0.08) 0%, transparent 50%);
    pointer-events: none;
}

.overview-wrapper {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.overview-table {
    margin: 0;
    padding: 0;
}

.overview-row {
    display: flex;
    border-bottom: 1px solid rgba(201, 169, 98, 0.2);
    padding: 1.2rem 0;
}

.overview-row:first-child {
    border-top: 2px solid var(--gold);
}

.overview-row:last-child {
    border-bottom: 2px solid var(--gold);
}

.overview-table dt {
    flex: 0 0 160px;
    font-weight: 600;
    color: var(--charcoal);
    letter-spacing: 0.08em;
    padding-right: 1.5rem;
    position: relative;
}

.overview-table dt::after {
    content: '';
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: 1px;
    background: rgba(201, 169, 98, 0.3);
}

.overview-table dd {
    flex: 1;
    margin: 0;
    padding-left: 1.5rem;
    line-height: 1.9;
    color: var(--text-primary);
}

.overview-table dd a {
    color: var(--gold-dark);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.3s;
}

.overview-table dd a:hover {
    border-bottom-color: var(--gold-dark);
}

.overview-program {
    margin-top: 3rem;
    padding-top: 2rem;
}

.overview-program-title {
    font-size: 1.3rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--charcoal);
    margin-bottom: 1.5rem;
    padding-bottom: 0.8rem;
    border-bottom: 2px solid var(--gold);
}

.overview-program-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.6rem 2rem;
}

.overview-program-list li {
    position: relative;
    padding-left: 1.2em;
    line-height: 1.8;
    color: var(--text-primary);
}

.overview-program-list li::before {
    content: '◆';
    position: absolute;
    left: 0;
    color: var(--gold);
    font-size: 0.7em;
    top: 0.35em;
}

@media (max-width: 768px) {
    .overview-section {
        padding: 3rem 1.5rem;
    }

    .overview-row {
        flex-direction: column;
        padding: 1rem 0;
    }

    .overview-table dt {
        flex: none;
        margin-bottom: 0.3rem;
        padding-right: 0;
        font-size: 0.85rem;
        color: var(--gold-dark);
    }

    .overview-table dt::after {
        display: none;
    }

    .overview-table dd {
        padding-left: 0;
    }

    .overview-program-list {
        grid-template-columns: 1fr;
    }
}

/* ===================================
   Preparing (Under Construction) Section
   =================================== */
.preparing-section {
    padding: 8rem 3rem;
    background: linear-gradient(135deg,
        #f5f0e6 0%,
        #ebe4d5 50%,
        #f0e9db 100%);
    text-align: center;
}

.preparing-wrapper {
    max-width: 600px;
    margin: 0 auto;
}

.preparing-text {
    font-size: 2rem;
    font-weight: 600;
    letter-spacing: 0.3em;
    color: var(--gold-dark);
    margin-bottom: 1.5rem;
}

.preparing-sub {
    font-size: 1.05rem;
    color: var(--text-muted);
    line-height: 2;
}

/* ===================================
   Sponsor Section
   =================================== */
.sponsor-section {
    padding: 5rem 3rem;
    background: linear-gradient(135deg,
        #f5f0e6 0%,
        #ebe4d5 50%,
        #f0e9db 100%);
}

.sponsor-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

.sponsor-heading {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--charcoal);
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--gold);
}

.sponsor-text {
    margin-bottom: 3rem;
    line-height: 2;
    color: var(--text-secondary);
    font-size: 1.05rem;
}

.sponsor-text p {
    margin-bottom: 0.5rem;
}

.sponsor-table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin-bottom: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
    background: white;
    position: relative;
}

.scroll-hint {
    display: none;
}

@media (max-width: 768px) {
    .sponsor-table-wrapper .sponsor-table {
        min-width: 500px;
    }

    .scroll-hint {
        display: flex;
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: linear-gradient(135deg, rgba(0,0,0,0.5) 0%, rgba(0,0,0,0.3) 100%);
        align-items: center;
        justify-content: center;
        z-index: 10;
        opacity: 1;
        transition: opacity 0.5s ease;
        pointer-events: none;
        border-radius: 8px;
        backdrop-filter: blur(2px);
        -webkit-backdrop-filter: blur(2px);
    }

    .scroll-hint.hidden {
        opacity: 0;
    }

    .scroll-hint-content {
        display: flex;
        flex-direction: column;
        align-items: center;
        color: #fff;
        text-shadow: 0 2px 4px rgba(0,0,0,0.3);
    }

    .scroll-hint-icon {
        font-size: 2em;
        margin-bottom: 0.3em;
        animation: swipe-hint 1.5s ease-in-out infinite;
    }

    .scroll-hint-text {
        font-size: 0.9em;
        font-weight: 500;
        letter-spacing: 0.05em;
    }

    @keyframes swipe-hint {
        0%, 100% {
            transform: translateX(-8px);
            opacity: 0.6;
        }
        50% {
            transform: translateX(8px);
            opacity: 1;
        }
    }
}

.sponsor-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 1rem;
}

.sponsor-table thead th {
    background: linear-gradient(180deg,
        #F7F0E4 0%,
        #EDE4D3 100%);
    color: var(--charcoal);
    padding: 1.2rem 1.5rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-align: center;
    white-space: nowrap;
    border-bottom: 2px solid var(--gold);
    border-top: 1px solid rgba(201, 169, 98, 0.3);
    position: relative;
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.7),
        0 2px 6px rgba(0, 0, 0, 0.04);
}

.sponsor-table thead th::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -2px;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg,
        transparent 0%,
        var(--gold) 50%,
        transparent 100%);
    opacity: 0.5;
}

.sponsor-table thead th:first-child {
    border-top-left-radius: 8px;
}

.sponsor-table thead th:last-child {
    border-top-right-radius: 8px;
}

.sponsor-table tbody td {
    padding: 1.2rem 1.5rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    color: var(--text-primary);
    vertical-align: middle;
    transition: background 0.3s ease;
}

.sponsor-table tbody td:nth-child(2),
.sponsor-table tbody td:nth-child(3) {
    text-align: center;
}

.sponsor-table tbody tr {
    transition: all 0.3s ease;
}

.sponsor-table tbody tr:hover {
    background: linear-gradient(90deg,
        rgba(201, 169, 98, 0.08) 0%,
        rgba(201, 169, 98, 0.04) 50%,
        rgba(201, 169, 98, 0.08) 100%);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.sponsor-note {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.sponsor-dl-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4em;
    padding: 0.55rem 1.3rem;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--charcoal);
    background: linear-gradient(135deg, var(--gold-light) 0%, var(--gold) 100%);
    border: 1px solid var(--gold);
    border-radius: 50px;
    text-decoration: none;
    letter-spacing: 0.06em;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
    box-shadow: 0 4px 15px rgba(201, 169, 98, 0.3);
    position: relative;
    overflow: hidden;
}

.sponsor-dl-btn::after {
    content: '';
    display: inline-block;
    width: 1em;
    height: 1em;
    background-color: currentColor;
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4'/%3E%3Cpolyline points='7 10 12 15 17 10'/%3E%3Cline x1='12' y1='15' x2='12' y2='3'/%3E%3C/svg%3E");
    -webkit-mask-size: contain;
    -webkit-mask-repeat: no-repeat;
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4'/%3E%3Cpolyline points='7 10 12 15 17 10'/%3E%3Cline x1='12' y1='15' x2='12' y2='3'/%3E%3C/svg%3E");
    mask-size: contain;
    mask-repeat: no-repeat;
    opacity: 0.8;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.sponsor-dl-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
    transition: left 0.6s ease;
}

.sponsor-dl-btn:hover::before {
    left: 100%;
}

.sponsor-dl-btn:hover {
    background: linear-gradient(135deg, var(--gold) 0%, var(--gold-dark) 100%);
    box-shadow: 0 6px 25px rgba(201, 169, 98, 0.5);
    transform: translateY(-2px);
}

.sponsor-dl-btn:hover::after {
    transform: translateY(2px);
    opacity: 1;
}

.sponsor-dl-btn:active {
    transform: translateY(0);
    box-shadow: 0 3px 10px rgba(201, 169, 98, 0.3);
}

.sponsor-preparing {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.sponsor-notice {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: 3rem;
}

.sponsor-contact {
    background: rgba(255, 255, 255, 0.7);
    border: 1px solid rgba(201, 169, 98, 0.3);
    border-radius: 8px;
    padding: 2rem;
}

.sponsor-contact-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--charcoal);
    margin-bottom: 1.2rem;
    letter-spacing: 0.05em;
}

.sponsor-contact-info {
    line-height: 2;
    color: var(--text-secondary);
    font-size: 1rem;
}

.sponsor-contact-org {
    font-weight: 600;
    color: var(--text-primary);
}

.sponsor-contact-info a {
    color: var(--gold-dark);
    text-decoration: none;
}

.sponsor-contact-info a:hover {
    text-decoration: underline;
}

/* ===================================
   Abstract Section
   =================================== */
.abstract-section {
    padding: 5rem 3rem;
    background: linear-gradient(135deg, #f5f0e6 0%, #ebe4d5 50%, #f0e9db 100%);
    position: relative;
}

.abstract-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(218, 165, 32, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(218, 165, 32, 0.08) 0%, transparent 50%);
    pointer-events: none;
}

.abstract-wrapper {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.abstract-period-box {
    background: rgba(201, 169, 98, 0.08);
    border: 2px solid var(--gold);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    margin-bottom: 3rem;
}

.abstract-period-label {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--charcoal);
    letter-spacing: 0.08em;
    margin-bottom: 0.5rem;
}

.abstract-period-date {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gold-dark);
    letter-spacing: 0.05em;
}

.abstract-period-note {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--charcoal);
    margin-top: 0.8rem;
}

.abstract-heading {
    font-size: 1.3rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--charcoal);
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--gold);
}

.abstract-text {
    line-height: 2;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.abstract-text p {
    margin-bottom: 0.8rem;
}

.abstract-text ul {
    list-style: none;
    padding: 0;
    margin: 0.5rem 0 1rem;
}

.abstract-text ul li {
    position: relative;
    padding-left: 1.2em;
    line-height: 2;
}

.abstract-text ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.85em;
    width: 6px;
    height: 6px;
    background: var(--gold);
    border-radius: 50%;
}

.abstract-text ol {
    padding-left: 1.5em;
    margin: 0.5rem 0 1rem;
}

.abstract-text ol li {
    line-height: 2;
}

.abstract-notice {
    background: #fff5f5;
    border: 2px solid #c0392b;
    border-radius: 8px;
    padding: 1.5rem 2rem;
    margin: 2rem 0;
}

.abstract-notice-title {
    font-weight: 700;
    color: #c0392b;
    margin-bottom: 0.8rem;
    font-size: 1.05rem;
}

.abstract-notice p {
    line-height: 1.8;
    color: var(--text-primary);
    margin-bottom: 0.3rem;
}

.abstract-section .sponsor-table tbody td {
    text-align: left;
    padding: 0.8rem 1.5rem;
}

.abstract-register-box {
    background: rgba(201, 169, 98, 0.08);
    border: 2px solid var(--gold);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    margin: 2rem 0;
}

.abstract-register-box p {
    margin-bottom: 1rem;
    font-size: 1.05rem;
    color: var(--text-secondary);
}

.abstract-register-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5em;
    padding: 1rem 3rem;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--charcoal);
    background: linear-gradient(135deg, var(--gold-light) 0%, var(--gold) 100%);
    border: 2px solid var(--gold);
    border-radius: 50px;
    text-decoration: none;
    letter-spacing: 0.08em;
    transition: all 0.35s ease;
    box-shadow: 0 4px 15px rgba(201, 169, 98, 0.3);
}

.abstract-register-btn:hover {
    background: linear-gradient(135deg, var(--gold) 0%, var(--gold-dark) 100%);
    box-shadow: 0 6px 25px rgba(201, 169, 98, 0.5);
    transform: translateY(-2px);
}

.coi-images-row {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin: 1.5rem 0;
    flex-wrap: wrap;
}

.coi-image-item {
    text-align: center;
    max-width: 48%;
}

.coi-image-item img {
    max-width: 100%;
    height: auto;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.coi-image-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.abstract-contact {
    background: rgba(255, 255, 255, 0.7);
    border: 1px solid rgba(201, 169, 98, 0.3);
    border-radius: 8px;
    padding: 2rem;
    margin-top: 3rem;
}

.abstract-contact-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--charcoal);
    margin-bottom: 1.2rem;
    letter-spacing: 0.05em;
}

.abstract-contact-info {
    line-height: 2;
    color: var(--text-secondary);
    font-size: 1rem;
}

.abstract-contact-org {
    font-weight: 600;
    color: var(--text-primary);
}

.abstract-contact-info a {
    color: var(--gold-dark);
    text-decoration: none;
}

.abstract-contact-info a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .abstract-section {
        padding: 3rem 1.5rem;
    }

    .abstract-categories {
        grid-template-columns: 1fr;
    }
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
    .top-header {
        height: 70px;
        gap: 1rem;
        padding: 0 1.5rem;
    }

    .top-header-title {
        font-size: 1.1rem;
        letter-spacing: 0.04em;
        white-space: nowrap;
        font-weight: 900;
    }

    .top-header-subtitle {
        font-size: 0.6rem;
    }

    .sidebar {
        top: 70px;
        left: auto;
        right: 0;
        width: var(--mobile-sidebar-width);
        height: calc(100vh - 70px);
        transform: translateX(100%);
        transition: transform 0.4s ease;
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .mobile-menu-btn {
        display: flex;
        top: 80px;
        left: auto;
        right: 1.5rem;
        opacity: 0.7;
    }

    .nav-links a {
        font-size: 1.1rem;
    }

    .main-content {
        margin-left: 0;
    }
}

@media (max-width: 420px) {
    .top-header {
        padding: 0 1rem;
        gap: 0.5rem;
    }

    .top-header-title {
        font-size: 0.95rem;
        letter-spacing: 0.03em;
        font-weight: 900;
    }

    .top-header-subtitle {
        font-size: 0.5rem;
    }
    .hero-text-wrapper {
        top: 10rem;
        bottom: 24rem;
    }
    .mobile-menu-btn {
        right: 1rem;
    }
    .hero-accent-text {
        margin-left: clamp(2rem, min(10vw, 10vh), 8rem)!important;
    }
}


@media (max-width: 768px) {
    .hero {
        min-height: 900px;
        padding: 8rem 1.5rem 4rem;
    }
    .hero-text-wrapper {
        top: 12rem;
        bottom: 24rem;
    }
    .hero-vertical-text span {
        font-size: clamp(1.5rem, 3.5vw, 2rem);
    }

    .hero-accent-text {
        margin-left: clamp(4rem, 8vw, 6rem);
    }

    .hero-accent-text span {
        font-size: clamp(1.5rem, 3.5vw, 2rem);
    }

    .hero-title {
        font-size: clamp(1.6rem, 6vw, 2.5rem);
        letter-spacing: 0.12em;
        white-space: normal;
    }

    .hero-subtitle {
        font-size: 0.65rem;
        letter-spacing: 0.1em;
    }

    .info-card {
        padding: 1.2rem 1.5rem;
    }

    .info-label {
        font-size: 1.4rem;
    }

    .info-main {
        font-size: 1.3rem;
    }

    .info-sub {
        font-size: 1.1rem;
    }

    .hero-info {
        bottom: 0;
        left: 0;
        right: 0;
    }

    .info-card-unified {
        flex-direction: column;
        align-items: center;
        gap: 1.5rem;
        padding: 2.5rem 1.5rem 1.5rem;
    }

    .info-divider {
        width: 80%;
        height: 1px;
        background: linear-gradient(90deg, transparent, var(--gold), transparent);
    }

    .news-section {
        padding: 4rem 1.5rem;
    }

    .news-item {
        flex-direction: column;
        gap: 0.8rem;
    }

    footer {
        padding: 3rem 1.5rem;
    }

    .footer-links {
        flex-direction: column;
        gap: 1rem;
    }
}
@media (max-width: 420px) {

    .hero-text-wrapper {
        top: 10rem;
        bottom: 24rem;
    }

}