/* 
 * CRCIV Global Stylesheet
 * Modernized with Glassmorphism, Micro-animations, and Premium Colors
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Noto+Sans+KR:wght@300;400;500;700&display=swap');

:root {
    --primary-color: #0f172a; 
    --primary-light: #1e293b; 
    --accent-color: #0ea5e9; 
    --accent-hover: #0284c7; 
    --bg-light: #ffffff;
    --bg-gray: #f8fafc; 
    --text-main: #334155; 
    --text-muted: #64748b; 
    --white: #ffffff;
    --header-bg: rgba(255, 255, 255, 0.8);
    --border-color: #e2e8f0;
    
    /* Animation Timing */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 10px 25px -5px rgba(0,0,0,0.05), 0 8px 10px -6px rgba(0,0,0,0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -6px rgba(0,0,0,0.04);
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --primary-color: #f1f5f9;
    --primary-light: #cbd5e1;
    --accent-color: #38bdf8;
    --accent-hover: #7dd3fc;
    --bg-light: #0f172a;
    --bg-gray: #1e293b;
    --text-main: #e2e8f0;
    --text-muted: #94a3b8;
    --white: #1e293b;
    --header-bg: rgba(15, 23, 42, 0.9);
    --border-color: #334155;
    --shadow-md: 0 10px 25px -5px rgba(0,0,0,0.3);
}



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

body { 
    font-family: 'Inter', 'Noto Sans KR', sans-serif; 
    color: var(--text-main); 
    line-height: 1.6; 
    overflow-x: hidden;
    background-color: var(--bg-light);
}

a { 
    text-decoration: none; 
    color: inherit; 
    transition: color var(--transition-normal); 
}

ul { list-style: none; }

/* ----------------------------------
   Typography
---------------------------------- */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.02em;
}

/* ----------------------------------
   Navigation / Header (Glassmorphism)
---------------------------------- */
header {
    position: fixed; 
    width: 100%; 
    top: 0; 
    left: 0; 
    z-index: 1000;
    background: var(--header-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition-normal);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 4rem;
    height: 80px;
}

header.scrolled {
    height: 70px;
    background: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.logo {
    flex: 1;
    font-size: 1.8rem;
    font-weight: 800;
    display: flex;
    align-items: center;
}

.logo a {
    text-decoration: none;
    color: var(--primary-color);
}

.logo span {
    color: var(--accent-color);
}

#main-nav {
    flex: 2;
    display: flex;
    justify-content: center;
}

#main-nav ul {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.header-tools {
    flex: 1;
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 1rem;
}

.tool-btn {
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 1.1rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.tool-btn:hover {
    background: var(--bg-gray);
    color: var(--accent-color);
}

nav a { 
    font-weight: 500; 
    font-size: 0.95rem; 
    position: relative;
    padding-bottom: 5px;
}

nav a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--accent-color);
    transition: width var(--transition-normal);
}

nav a:hover, nav a.active { 
    color: var(--accent-color); 
}

nav a:hover::after, nav a.active::after {
    width: 100%;
}

/* Mobile Toggle */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    z-index: 1001;
}

.mobile-toggle span {
    display: block;
    width: 28px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 3px;
    transition: all 0.3s ease;
}

.mobile-toggle.active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}
.mobile-toggle.active span:nth-child(2) {
    opacity: 0;
}
.mobile-toggle.active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}


/* ----------------------------------
   Common Section Styles
---------------------------------- */
main {
    margin-top: 80px; 
    padding: 4rem 10%;
    min-height: calc(100vh - 200px);
}

section { 
    padding: 6rem 10%; 
}

.bg-gray { 
    background-color: var(--bg-gray); 
}

.section-title { 
    text-align: center; 
    margin-bottom: 3.5rem; 
    font-size: 2.5rem; 
    font-weight: 800; 
    color: var(--primary-color); 
    position: relative;
}

.section-title::after { 
    content: ''; 
    display: block; 
    width: 60px; 
    height: 4px; 
    background: linear-gradient(90deg, var(--accent-color), #00d2ff); 
    margin: 15px auto 0; 
    border-radius: 2px;
}

/* ----------------------------------
   Buttons
---------------------------------- */
.btn {
    display: inline-block; 
    padding: 12px 30px; 
    border-radius: 30px;
    font-weight: 600; 
    transition: all var(--transition-normal);
    cursor: pointer;
    border: none;
    font-family: inherit;
    font-size: 1rem;
}

.btn-primary {
    background: var(--accent-color);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(58, 134, 255, 0.4);
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(58, 134, 255, 0.5);
    color: var(--white);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--white);
    color: var(--white);
}

.btn-outline:hover {
    background: var(--white);
    color: var(--primary-color);
}

/* ----------------------------------
   Cards (Micro-animations)
---------------------------------- */
.card {
    background: var(--white); 
    padding: 3rem 2rem; 
    border-radius: 24px;
    box-shadow: var(--shadow-md); 
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    z-index: 1;
    height: 100%;
    border: 1px solid rgba(0,0,0,0.03);
}

.card:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-color);
}


.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-color), #00d2ff);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-normal);
    z-index: -1;
}

.card:hover::before {
    transform: scaleX(1);
}


/* ----------------------------------
   Footer
---------------------------------- */
footer { 
    background: var(--primary-color); 
    color: #aeb6bf; 
    padding: 4rem 10% 2rem; 
    text-align: center; 
}

footer strong {
    color: var(--white);
    font-size: 1.1rem;
}

footer p { 
    margin-bottom: 0.5rem; 
    font-size: 0.95rem; 
}

footer a {
    color: #cbd5e1;
}

footer a:hover {
    color: var(--white);
}

footer .social-links { 
    margin-top: 2rem; 
    display: flex; 
    justify-content: center; 
    gap: 1.5rem; 
}

footer .social-links a { 
    background: rgba(255,255,255,0.1);
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    color: var(--white); 
    font-size: 1.2rem; 
    transition: all var(--transition-normal); 
}

footer .social-links a:hover { 
    background: var(--accent-color);
    transform: translateY(-3px);
}

.footer-bottom {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 0.85rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

@media (max-width: 768px) {
    .mobile-toggle {
        display: flex;
    }

    nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100vh;
        background: var(--white);
        padding: 6rem 2rem;
        transition: 0.4s ease;
        box-shadow: -10px 0 30px rgba(0,0,0,0.1);
        z-index: 1000;
    }

    nav.active {
        right: 0;
    }

    nav ul {
        flex-direction: column;
        gap: 2rem;
    }

    nav a {
        font-size: 1.2rem;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 15px;
    }
}


/* ----------------------------------
   Animations (AOS alternative via CSS)
---------------------------------- */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ----------------------------------
   Responsive Design
---------------------------------- */
@media (max-width: 768px) {
    nav ul {
        display: none; /* Add JS toggle later for mobile menu */
    }
    
    header {
        padding: 1rem 5%;
    }
    
    section {
        padding: 4rem 5%;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    main {
        padding: 3rem 5%;
    }
}

/* ----------------------------------
   Grid Layouts
---------------------------------- */
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; }
.grid-4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 2rem; }

/* ----------------------------------
   Home Page Specific
---------------------------------- */
.hero {
    height: 100vh;
    position: relative;
    overflow: hidden;
    color: white; 
    display: flex; 
    align-items: center;
    justify-content: center;
    text-align: center;
}

.hero-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(rgba(15, 23, 42, 0.4), rgba(15, 23, 42, 0.8));
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 10;
    padding: 0 2rem;
}


.hero h1 { 
    font-size: 4rem; 
    font-weight: 800; 
    margin-bottom: 1.5rem; 
    letter-spacing: -1px; 
    color: var(--white);
    animation: fadeDown 1s ease-out;
}

.hero p { 
    font-size: 1.25rem; 
    font-weight: 300; 
    max-width: 800px; 
    color: #cbd5e1; 
    margin-bottom: 2.5rem; 
    animation: fadeUp 1s ease-out 0.3s backwards;
}

.hero .btn {
    animation: fadeUp 1s ease-out 0.6s backwards;
}

@keyframes fadeDown {
    from { opacity: 0; transform: translateY(-30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.card i { 
    font-size: 3rem; 
    color: var(--accent-color); 
    margin-bottom: 1.5rem; 
    transition: transform var(--transition-normal);
}
.card:hover i { transform: scale(1.1); }
.card h3 { font-size: 1.4rem; margin-bottom: 1rem; color: var(--primary-color); }
.card p { color: var(--text-muted); font-size: 1rem; }

/* ----------------------------------
   Tags
---------------------------------- */
.tag { 
    display: inline-block; 
    background: var(--bg-gray); 
    color: var(--text-main); 
    font-size: 0.75rem; 
    font-weight: 500;
    padding: 4px 10px; 
    border-radius: 20px; 
    margin-top: 10px; 
    margin-right: 5px;
    transition: all 0.2s;
}
.tag:hover {
    background: var(--accent-color);
    color: var(--white);
}

/* ----------------------------------
   Publications Page Specific
---------------------------------- */
.filters { margin-bottom: 2.5rem; display: flex; gap: 1rem; flex-wrap: wrap; justify-content: center; }
.filter-btn {
    padding: 0.6rem 1.5rem;
    border: 2px solid var(--bg-gray);
    background: var(--white);
    border-radius: 30px;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-muted);
}
.filter-btn:hover,
.filter-btn.active { 
    background: var(--accent-color); 
color: var(--white); 
    border-color: var(--accent-color); 
    box-shadow: 0 4px 10px rgba(58, 134, 255, 0.3);
}

/* Projects Page - SuanLab Style */
.projects-hero {
    background: linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.4)), linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: white;
    padding: 10rem 2rem 12rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.projects-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 50% 50%, rgba(34, 211, 238, 0.15) 0%, transparent 70%);
    pointer-events: none;
}

.projects-hero h1 {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    letter-spacing: -0.03em;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.projects-hero .subtitle {
    font-size: 1.4rem;
    opacity: 1;
    max-width: 900px;
    margin: 0 auto;
    font-weight: 600;
    line-height: 1.6;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

.projects-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    max-width: 1200px;
    margin: -4rem auto 4rem;
    padding: 0 2rem;
    position: relative;
    z-index: 10;
}

.stat-card {
    background: var(--white);
    padding: 2.5rem 1.5rem;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    text-align: center;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-card h3 {
    font-size: 2.2rem;
    color: var(--accent-color);
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.stat-card p {
    color: var(--text-main);
    font-weight: 800;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.projects-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.filter-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.filter-tab {
    padding: 0.75rem 1.5rem;
    border-radius: 9999px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    background: #f1f5f9;
    color: #64748b;
    border: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.filter-tab .count {
    background: rgba(0, 0, 0, 0.05);
    padding: 0.1rem 0.5rem;
    border-radius: 999px;
    font-size: 0.8rem;
}

.filter-tab.active {
    background: #0ea5e9;
    color: white;
}

.filter-tab.active .count {
    background: rgba(255, 255, 255, 0.2);
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--white);
    border-radius: 16px;
    padding: 2rem;
    border: 1px solid var(--border-color);
    transition: all 0.3s;
    position: relative;
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-color);
}

.status-badge {
    align-self: flex-start;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.status-active { background: #dcfce7; color: #15803d; }
.status-completed { background: var(--bg-gray); color: var(--text-muted); }

.project-card h3 {
    font-size: 1.25rem;
    line-height: 1.4;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.project-info {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding-top: 1.5rem;
    border-top: 1px solid #f1f5f9;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9rem;
    color: #475569;
}

.info-item i {
    color: #0ea5e9;
    width: 1.25rem;
    text-align: center;
}

.info-item .label {
    font-weight: 600;
    min-width: 80px;
    color: #64748b;
}

.pub-item {
    background: var(--white);
    padding: 1.5rem 2rem;
    border-left: 4px solid var(--accent-color);
    box-shadow: var(--shadow-sm);
    border-radius: 0 12px 12px 0;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}
.pub-item:hover { 
    transform: translateX(10px); 
    box-shadow: var(--shadow-md);
}
.pub-item h3 { font-size: 1.15rem; margin-bottom: 0.6rem; color: var(--primary-color); }
.pub-item h3 a { color: inherit; transition: color var(--transition-fast); }
.pub-item h3 a:hover { color: var(--accent-color); text-decoration: none; }
.pub-item h3 a i { font-size: 0.8em; opacity: 0.5; margin-left: 5px; transition: opacity 0.2s; }
.pub-item h3 a:hover i { opacity: 1; }
.pub-item .authors { font-size: 0.95rem; color: #555; margin-bottom: 0.4rem; }
.pub-item .venue { font-size: 0.9rem; font-style: italic; color: var(--text-muted); margin-bottom: 0.6rem; }
.pub-item .year { display: inline-block; background: var(--bg-gray); color: var(--text-main); font-size: 0.8rem; font-weight: 600; padding: 3px 10px; border-radius: 12px; margin-right: 5px; }
.pub-item .citation { display: inline-block; background: #cfe2ff; color: #084298; font-size: 0.8rem; font-weight: 600; padding: 3px 10px; border-radius: 12px; }

.stats { 
    background: var(--white); 
    padding: 2.5rem; 
    border-radius: 16px; 
    margin-bottom: 3rem; 
    display: grid; 
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); 
    gap: 1.5rem; 
    text-align: center; 
    box-shadow: var(--shadow-sm);
}
.stat-item h3 { font-size: 2.5rem; color: var(--accent-color); font-weight: 800; margin-bottom: 0.5rem; }
.stat-item p { color: var(--text-muted); font-size: 1rem; font-weight: 500; }


/* ----------------------------------
   Team Page Specific
---------------------------------- */
.member-card {
    background: var(--white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    text-align: center;
    border: 1px solid rgba(0,0,0,0.03);
}
.member-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}
.member-image {
    width: 100%;
    height: 220px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 4rem;
    position: relative;
}
.member-image::after {
    content: '';
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-50%);
    border-width: 20px 20px 0;
    border-style: solid;
    border-color: var(--primary-color) transparent transparent transparent;
}
.member-info { padding: 2.5rem 1.5rem 1.5rem; }
.member-name { font-size: 1.25rem; font-weight: 800; color: var(--primary-color); margin-bottom: 0.3rem; }
.member-title { font-size: 0.95rem; color: var(--accent-color); font-weight: 600; margin-bottom: 1rem; }
.member-bio { font-size: 0.9rem; color: var(--text-muted); line-height: 1.6; }

/* ----------------------------------
   Contact Page Specific
---------------------------------- */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    max-width: 1100px;
    margin: 0 auto;
}
@media (max-width: 768px) { .contact-container { grid-template-columns: 1fr; } }
.contact-info { background: var(--bg-gray); padding: 2.5rem; border-radius: 16px; box-shadow: var(--shadow-sm); }
.contact-info h2 { font-size: 1.8rem; color: var(--primary-color); margin-bottom: 2rem; }
.info-item { margin-bottom: 1.8rem; display: flex; align-items: flex-start; gap: 1.2rem; }
.info-item i { font-size: 1.5rem; color: var(--accent-color); min-width: 30px; text-align: center; margin-top: 0.2rem; }
.info-item h3 { font-size: 1.1rem; color: var(--primary-color); margin-bottom: 0.3rem; }
.info-item p, .info-item a { font-size: 0.95rem; color: var(--text-muted); }
.info-item a { font-weight: 600; color: var(--accent-color); }
.info-item a:hover { text-decoration: underline; color: var(--accent-hover); }

.contact-form {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
}
.contact-form h2 { font-size: 1.8rem; color: var(--primary-color); margin-bottom: 2rem; }
.form-group { margin-bottom: 1.5rem; position: relative; }
.form-group label { display: block; font-weight: 600; margin-bottom: 0.5rem; color: var(--primary-color); font-size: 0.95rem; }
.form-group input, .form-group textarea {
    width: 100%;
    padding: 0.9rem 1rem;
    border: 1px solid #ced4da;
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    transition: all var(--transition-fast);
    background-color: #fcfcfc;
}
.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 4px rgba(58, 134, 255, 0.15);
    background-color: var(--white);
}
.form-group textarea { resize: vertical; min-height: 140px; }
.submit-btn {
    background: var(--accent-color);
    color: var(--white);
    padding: 1rem 2rem;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1.05rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    width: 100%;
    box-shadow: 0 4px 15px rgba(58, 134, 255, 0.3);
}
.submit-btn:hover { background: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(58, 134, 255, 0.4); }

.location-map { margin-top: 4rem; border-radius: 16px; overflow: hidden; box-shadow: var(--shadow-md); }
.location-map h2 { font-size: 1.8rem; color: var(--primary-color); margin-bottom: 1.5rem; }
.map-placeholder {
    width: 100%;
    height: 450px;
    background: var(--bg-gray);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 16px;
    position: relative;
    overflow: hidden;
}
.map-placeholder iframe {
    width: 100%;
    height: 100%;
    border: 0;
}
.subtitle { color: var(--text-muted); margin-bottom: 2rem; font-size: 1.1rem; }

.research-area {
    background: var(--white);
    padding: 2.5rem;
    margin-bottom: 2.5rem;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    border-left: 5px solid var(--accent-color);
    transition: all var(--transition-normal);
}

.research-area:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(5px);
}

.research-area h2 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.research-area h2 i {
    color: var(--accent-color);
    font-size: 2rem;
}

.research-area .description {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
    line-height: 1.7;
}

.research-area h3 {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-top: 1.5rem;
    margin-bottom: 0.8rem;
}

.research-area ul {
    margin-left: 1.5rem;
    color: var(--text-main);
}

.research-area li {
    list-style: disc;
    margin-bottom: 0.5rem;
}

.key-papers {
    background: var(--bg-gray);
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 1.5rem;
}

.key-papers p {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.paper-link {
    color: var(--accent-color);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.paper-link:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* ----------------------------------
   Latest News (Home Page)
---------------------------------- */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.news-card {
    background: #fff;
    border: 1px solid #edf2f7;
    padding: 1.5rem;
    border-radius: 12px;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.news-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
    border-color: var(--accent-color);
}

.news-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: #718096;
    margin-bottom: 1rem;
}

.news-source {
    font-weight: 700;
    color: var(--accent-color);
    display: flex;
    align-items: center;
    gap: 5px;
}

.news-title {
    text-decoration: none;
    color: inherit;
}

.news-title h3 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    line-height: 1.4;
    color: #1a202c;
    transition: color 0.2s;
}

.news-card:hover .news-title h3 {
    color: var(--accent-color);
}

.news-summary {
    font-size: 0.9rem;
    color: #4a5568;
    line-height: 1.5;
    flex-grow: 1;
}

.bg-white {
    background-color: var(--white);
}