/* ===================================
   アトピー性皮膚炎治療研究会
   第32回シンポジウム
   Design System - Blue/White/Green
   =================================== */

:root {
    --primary: #1B6B9C;
    --primary-light: #3A8BC2;
    --primary-dark: #0D4A6F;
    --primary-darker: #082F47;
    --accent: #4CAF50;
    --accent-light: #81C784;
    --accent-dark: #388E3C;
    --white: #FFFFFF;
    --warm-white: #FAFCFD;
    --light-gray: #F0F4F8;
    --light-blue: #E8F0F7;
    --border-light: #D0DDE8;
    --text-primary: #1A1A1A;
    --text-secondary: #5A5A5A;
    --text-muted: #8A8A8A;
    --sidebar-width: 280px;
    --mobile-sidebar-width: 300px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans JP', sans-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: 180px;
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    z-index: 1001;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 0;
    padding-left: var(--sidebar-width);
}

.header-logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    padding: 0.6rem 2rem 0;
}

.top-header-titles {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.top-header-title {
    font-size: 3.8rem;
    letter-spacing: 0.08em;
    color: #0161AE;
    font-weight: 900;
    line-height: 1.3;
}

.top-header-badge {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    display: block;
    font-size: 3.2rem;
    letter-spacing: 0.15em;
    color: #ffffff;
    font-weight: 900;
    line-height: 1.2;
    background: linear-gradient(90deg,
        rgba(235, 98, 39, 0) 0%,
        rgba(235, 98, 39, 0.5) 8%,
        #EB6227 20%,
        #EB6227 80%,
        rgba(235, 98, 39, 0.5) 92%,
        rgba(235, 98, 39, 0) 100%
    );
    padding: 0.6rem 0;
    padding-left: var(--sidebar-width);
    text-align: center;
}

/* ===================================
   Left Sidebar Navigation
   =================================== */
.sidebar {
    position: fixed;
    top: 180px;
    left: 0;
    width: var(--sidebar-width);
    height: calc(100vh - 180px);
    background: var(--white);
    border-right: 1px solid var(--border-light);
    box-shadow: 2px 0 15px rgba(0, 0, 0, 0.05);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    padding: 1.5rem 0;
    overflow-y: auto;
}

.nav-links {
    display: flex;
    flex-direction: column;
    padding: 0.5rem 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: 0.85rem 1.8rem;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 400;
    letter-spacing: 0.05em;
    position: relative;
    transition: all 0.3s ease;
}

.nav-icon {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--primary-light);
    opacity: 0.4;
    transition: all 0.3s ease;
    flex-shrink: 0;
}

.nav-links a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 3px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary-light), var(--primary));
    transform: scaleY(0);
    transition: transform 0.3s ease;
    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(27, 107, 156, 0.08), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.nav-links a:hover {
    color: var(--primary);
    padding-left: 2.2rem;
}

.nav-links a:hover .nav-icon {
    width: 10px;
    height: 10px;
    opacity: 1;
    background: var(--primary);
}

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

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

.nav-links a.active {
    color: var(--primary);
    font-weight: 600;
}

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

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

.sidebar-poster {
    padding: 1.5rem;
    text-align: center;
    border-top: 1px solid var(--border-light);
    margin-top: auto;
}

.sidebar-poster-title {
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    color: var(--primary);
    margin-bottom: 0.8rem;
}

.sidebar-poster-img {
    width: 100%;
    border-radius: 4px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.sidebar-poster-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    margin-top: 1rem;
    padding: 0.5rem 1.2rem;
    font-size: 0.85rem;
    color: var(--white);
    background: var(--primary);
    border-radius: 4px;
    text-decoration: none;
    letter-spacing: 0.08em;
    transition: background 0.3s ease;
}

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

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

/* ===================================
   Hero Section
   =================================== */
.hero {
    display: flex;
    flex-direction: column;
    position: relative;
    padding-top: 180px;
}

.hero-visual {
    position: relative;
    background-color: var(--white);
    overflow: hidden;
}

.hero-visual::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 10px;
    background: linear-gradient(to bottom, var(--white) 0%, transparent 100%);
    pointer-events: none;
    z-index: 1;
}

.hero-visual::after {
    display: none;
}

.hero-bg-img {
    display: block;
    /*width: 70%;*/
    max-width: 800px;
    height: auto;
    margin: -250px auto 0;
}

.hero-theme {
    position: absolute;
    top: 15px;
    left: 0;
    right: 0;
    z-index: 10;
    text-align: center;
    pointer-events: none;
}

.hero-theme-img {
    max-width: 65%;
    max-height: 280px;
    height: auto;
    width: auto;
}

.hero-info {
    position: relative;
    margin-top: -20rem;
    opacity: 0;
    animation: fadeUpInfo 1s ease forwards 0.5s;
    z-index: 20;
}

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

.info-card-unified {
    background: linear-gradient(180deg,
        rgba(8, 47, 71, 0) 0%,
        rgba(8, 47, 71, 0.85) 35%,
        rgba(8, 47, 71, 0.95) 100%);
    padding: 3rem 2rem 1.5rem;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    align-items: flex-start;
    gap: 1rem 3rem;
    width: 100%;
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    text-align: center;
    transition: transform 0.3s ease;
    cursor: default;
}

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

.info-item:hover {
    transform: translateY(-3px);
}

.info-divider {
    display: none;
}

.info-label {
    font-size: 1.7rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--accent-light);
    margin-bottom: 0.3rem;
}

.info-main {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: #ffffff;
    line-height: 1.5;
    white-space: nowrap;
}

.info-sub {
    font-size: 1.05rem;
    letter-spacing: 0.05em;
    color: rgba(224, 238, 247, 0.9);
    line-height: 1.5;
    white-space: nowrap;
}

.info-notice {
    font-size: 0.75rem;
    font-weight: 700;
    color: #EB6227;
    line-height: 1.4;
    margin-top: 0.3rem;
}

.info-note {
    font-size: 1.05rem;
    color: rgba(200, 220, 235, 0.8);
    margin-top: 0.2rem;
}

.scroll-indicator {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1.5rem 0;
    /*background: rgba(8, 47, 71, 0.95);*/
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 30;
    opacity: 0;
    animation: fadeInBounce 1s ease forwards 1.5s;
    margin-top: -5em;
}

@keyframes fadeInBounce {
    0% {
        opacity: 0;
        transform: translateY(-10px);
    }
    60% {
        opacity: 1;
        transform: translateY(3px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.scroll-indicator:hover {
    opacity: 0.8;
}

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

.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: 5rem 3rem;
    background: linear-gradient(135deg,
        #f5f9fc 0%,
        #eaf2f8 50%,
        #f0f6fb 100%);
    position: relative;
}

.news-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg,
        transparent 0%,
        var(--primary-light) 20%,
        var(--primary-light) 80%,
        transparent 100%);
    opacity: 0.3;
    z-index: 2;
}

.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: -1.5rem;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-light), var(--accent), var(--primary-light));
    border-radius: 1px;
}

.news-title {
    font-size: 1.4rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    color: var(--primary-dark);
}

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

.news-item {
    display: flex;
    gap: 2rem;
    padding: 1.3rem 1.5rem;
    border: 1px solid var(--border-light);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.7);
    transition: all 0.3s ease;
    margin-bottom: 0.8rem;
    position: relative;
}

.news-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 3px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary-light), var(--primary));
    border-radius: 8px 0 0 8px;
    transform: scaleY(0);
    transition: transform 0.3s ease;
}

.news-item:hover {
    background: rgba(255, 255, 255, 0.95);
    border-color: var(--primary-light);
    transform: translateX(6px);
    box-shadow: 0 4px 20px rgba(27, 107, 156, 0.1);
}

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

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

.news-date {
    font-size: 0.95rem;
    color: var(--primary);
    letter-spacing: 0.03em;
    font-weight: 500;
}

.news-badge {
    font-size: 0.6rem;
    padding: 0.15rem 0.5rem;
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    color: var(--white);
    border-radius: 100px;
    letter-spacing: 0.1em;
    font-weight: 600;
}

.news-text {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.news-text a {
    color: var(--primary);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.3s ease;
}

.news-text a:hover {
    border-bottom-color: var(--primary);
}

/* ===================================
   Footer
   =================================== */
footer {
    padding: 3.5rem 3rem;
    background: linear-gradient(180deg, var(--primary-darker) 0%, var(--primary-dark) 100%);
    border-top: 2px solid var(--primary-light);
    position: relative;
    overflow: hidden;
}

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

.footer-logo {
    font-size: 0.9rem;
    letter-spacing: 0.12em;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 1.5rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
    list-style: none;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.footer-links a {
    font-size: 0.78rem;
    color: rgba(224, 238, 247, 0.7);
    text-decoration: none;
    letter-spacing: 0.05em;
    transition: all 0.3s ease;
    position: relative;
}

.footer-links a::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent-light);
    transition: width 0.3s ease;
}

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

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

.footer-contact {
    margin-bottom: 1.5rem;
    padding: 1.2rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-contact p {
    font-size: 0.8rem;
    color: rgba(224, 238, 247, 0.7);
    line-height: 1.8;
}

.footer-contact a {
    color: var(--accent-light);
    text-decoration: none;
}

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

.copyright {
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.7rem;
    color: rgba(224, 238, 247, 0.5);
    letter-spacing: 0.05em;
}

/* ===================================
   Mobile Menu Button
   =================================== */
.mobile-menu-btn {
    display: none;
    position: fixed;
    top: 120px;
    right: 1.5rem;
    width: 48px;
    height: 48px;
    background: var(--white);
    border: 2px solid var(--primary-light);
    border-radius: 50%;
    cursor: pointer;
    z-index: 1001;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
}

.mobile-menu-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px rgba(27, 107, 156, 0.25);
}

.mobile-menu-btn span {
    width: 18px;
    height: 2px;
    background: var(--primary);
    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: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border: none;
    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(27, 107, 156, 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(27, 107, 156, 0.4);
}

.back-to-top svg {
    width: 22px;
    height: 22px;
    color: var(--white);
    transition: transform 0.3s ease;
}

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

/* ===================================
   Reveal Animations
   =================================== */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* ===================================
   Page Header (for sub pages)
   =================================== */
.page-header {
    position: relative;
    padding: calc(180px + 2.5rem) 3rem 2.5rem;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-dark) 100%);
    text-align: center;
    overflow: hidden;
}

.page-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
}

.page-title {
    font-size: clamp(1.2rem, 3vw, 1.6rem);
    font-weight: 500;
    letter-spacing: 0.2em;
    color: #ffffff;
    position: relative;
    z-index: 1;
}

/* ===================================
   Content Sections (shared for sub pages)
   =================================== */
.content-section {
    padding: 4rem 3rem;
    background: linear-gradient(135deg,
        #f5f9fc 0%,
        #eaf2f8 50%,
        #f0f6fb 100%);
    position: relative;
}

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

/* Greeting Section */
.greeting-section {
    padding: 5rem 3rem;
    background: linear-gradient(135deg,
        #f5f9fc 0%,
        #eaf2f8 50%,
        #f0f6fb 100%);
    position: relative;
}

.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 var(--border-light);
}

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

.greeting-author-row {
    display: flex;
    align-items: flex-end;
    justify-content: flex-end;
    gap: 2rem;
    margin-top: 1.5rem;
}

.greeting-author {
    text-align: right;
}

.author-role {
    font-size: 0.9rem;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
    margin-bottom: 0.3rem;
}

.author-name {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.1em;
}

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

.greeting-content {
    overflow: hidden;
}

.greeting-photo-wrapper {
    flex-shrink: 0;
}

.greeting-photo {
    width: 180px;
    height: auto;
    border-radius: 6px;
    background-color: #e8e8e8;
}

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

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

.greeting-signature {
    clear: both;
    text-align: right;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-light);
}

.signature-role {
    font-size: 0.95rem;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
    line-height: 1.8;
    margin-bottom: 0.5rem;
}

.signature-name {
    font-size: 1.6rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.1em;
    margin-bottom: 0.3rem;
}

.signature-affiliation {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* Preparing (Under Construction) Section */
.preparing-section {
    padding: 8rem 3rem;
    background: linear-gradient(135deg,
        #f5f9fc 0%,
        #eaf2f8 50%,
        #f0f6fb 100%);
    text-align: center;
}

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

.preparing-text {
    font-size: 1.8rem;
    font-weight: 500;
    letter-spacing: 0.25em;
    color: var(--primary);
    margin-bottom: 1.5rem;
}

.preparing-sub {
    font-size: 1rem;
    color: var(--text-muted);
    line-height: 2;
}

/* Overview Section */
.overview-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 2rem;
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.overview-table th,
.overview-table td {
    padding: 1.2rem 1.5rem;
    border-bottom: 1px solid var(--border-light);
    text-align: left;
    vertical-align: top;
}

.overview-table th {
    width: 140px;
    background: var(--light-blue);
    color: var(--primary-dark);
    font-weight: 600;
    font-size: 0.9rem;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.overview-table td {
    color: var(--text-primary);
    font-size: 0.95rem;
}

/* Overview Notice */
.overview-notice {
    font-size: 0.85rem;
    font-weight: 700;
    color: #EB6227;
    line-height: 1.6;
    margin-top: 0.5rem;
}

/* Sponsor Section */
.sponsor-heading {
    font-size: 1.3rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--primary-dark);
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--primary-light);
}

.sponsor-text {
    margin-bottom: 2rem;
    line-height: 2;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.sponsor-table-wrapper {
    overflow-x: auto;
    margin-bottom: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    background: white;
}

.sponsor-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.sponsor-table thead th {
    background: var(--light-blue);
    color: var(--primary-dark);
    padding: 1rem 1.2rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-align: center;
    white-space: nowrap;
    border-bottom: 2px solid var(--primary-light);
}

.sponsor-table tbody td {
    padding: 1rem 1.2rem;
    border-bottom: 1px solid var(--border-light);
    color: var(--text-primary);
    vertical-align: middle;
}

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

.sponsor-table tbody tr:hover {
    background: rgba(27, 107, 156, 0.04);
}

.sponsor-contact {
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    padding: 2rem;
    margin-top: 2rem;
}

.sponsor-contact-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-dark);
    margin-bottom: 1rem;
    letter-spacing: 0.05em;
}

.sponsor-contact-info {
    line-height: 2;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

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

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

.sponsor-apply-btn {
    display: inline-block;
    padding: 0.8rem 2.5rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    text-decoration: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(27, 107, 156, 0.3);
}

.sponsor-apply-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(27, 107, 156, 0.4);
}

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

/* Links Section */
.links-list {
    list-style: none;
}

.links-item {
    padding: 1.2rem 1.5rem;
    border: 1px solid var(--border-light);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.7);
    margin-bottom: 0.8rem;
    transition: all 0.3s ease;
}

.links-item:hover {
    background: rgba(255, 255, 255, 0.95);
    border-color: var(--primary-light);
    box-shadow: 0 4px 15px rgba(27, 107, 156, 0.08);
}

.links-item a {
    color: var(--primary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
}

.links-item a:hover {
    text-decoration: underline;
}

.links-item p {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.3rem;
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1220px) {
    .top-header{
        height: 160px;
    }
    .top-header-title{
        font-size: 3rem;
    }
    .top-header-badge{
        font-size: 2.8rem;
    }
    .hero{
        padding-top: 160px;
    }
    .sidebar{
        top: 160px;
    }

}
@media (max-width: 1024px) {
    .top-header {
        height: 100px;
        gap: 1rem;
        padding: 0;
    }

    .header-logo-link {
        padding: 0.4rem 1.5rem 0;
    }

    .top-header-title {
        font-size: 1.6rem;
        letter-spacing: 0.08em;
    }

    .top-header-badge {
        font-size: 1.6rem;
        /*padding-left: 5rem;*/
        padding-left: 0;
    }

    .hero {
        padding-top: 100px;
    }

    .hero-bg-img {
        width: 85%;
        margin-top: 0;
    }

    .hero-theme {
        top: 15px;
    }

    .hero-theme-img {
        max-width: 80%;
    }

    .sidebar {
        top: 120px;
        left: auto;
        right: 0;
        width: var(--mobile-sidebar-width);
        height: calc(100vh - 120px);
        transform: translateX(100%);
        transition: transform 0.4s ease;
        box-shadow: -4px 0 20px rgba(0, 0, 0, 0.1);
    }

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

    .mobile-menu-btn {
        display: flex;
        top: 12px;
        right: 1.5rem;
        z-index: 1002;
    }

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

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

    .page-header {
        padding: calc(120px + 2rem) 2rem 2rem;
    }
}

@media (max-width: 768px) {
    .hero-bg-img {
        width: 100%;
    }

    .info-card-unified {
        flex-direction: column;
        align-items: center;
        gap: 0.8rem;
        padding: 1.5rem 1.5rem 1.5rem;
    }

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

    .info-main {
        font-size: 1.1rem;
        white-space: normal;
    }

    .info-sub {
        font-size: 0.9rem;
        white-space: normal;
    }

    .info-note {
        font-size: 0.9rem;
    }

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

    .news-item {
        flex-direction: column;
        gap: 0.5rem;
    }

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

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

    .greeting-title {
        font-size: 1.2rem;
        letter-spacing: 0.1em;
    }

    .greeting-header {
        margin-bottom: 2rem;
        padding-bottom: 1.5rem;
    }

    .page-header {
        padding: calc(120px + 1.5rem) 1.5rem 1.5rem;
    }

    .greeting-author-row {
        flex-direction: column-reverse;
        align-items: center;
        gap: 1rem;
    }

    .greeting-author {
        text-align: center;
    }

    .greeting-photo {
        width: 150px;
    }

    .greeting-text {
        line-height: 2;
        font-size: 0.95rem;
    }

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

    .preparing-section {
        padding: 5rem 1.5rem;
    }

    footer {
        padding: 3rem 1.5rem;
    }

    .footer-links {
        flex-direction: column;
        gap: 0.8rem;
    }

    .overview-table th,
    .overview-table td {
        padding: 0.8rem 1rem;
        font-size: 0.85rem;
    }

    .overview-table th {
        width: 100px;
    }
}

@media (max-width: 420px) {
    .top-header {
        height: 100px;
    }

    .header-logo-link {
        padding: 0.3rem 1rem 0;
    }

    .top-header-title {
        font-size: 1.2rem;
        letter-spacing: 0.05em;
    }

    .top-header-badge {
        font-size: 1.2rem;
        /*padding-left: 3.5rem;*/
        padding-left: 0;
    }

    .hero {
        padding-top: 100px;
    }
    .hero-info{
        margin-top: -12rem;
    }
    .info-card-unified {
        gap: 0.6rem;
        padding: 1.2rem 1rem;
    }

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

    .info-main {
        font-size: 1rem;
    }

    .info-sub,
    .info-note {
        font-size: 0.85rem;
    }

    .hero-theme {
        top: 10px;
    }

    .hero-theme-img {
        max-width: 90%;
    }

    .sidebar {
        top: 100px;
        height: calc(100vh - 100px);
    }

    .mobile-menu-btn {
        right: 1rem;
    }

    .page-header {
        padding: calc(100px + 1.5rem) 1rem 1.5rem;
    }

    .greeting-section {
        padding: 2rem 1rem;
    }

    .greeting-title {
        font-size: 1.1rem;
    }

    .greeting-photo {
        width: 130px;
    }

    .greeting-text {
        font-size: 0.9rem;
    }

    .author-name {
        font-size: 1.05rem;
    }

    .author-role,
    .author-affiliation {
        font-size: 0.85rem;
    }
}