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

            body {
                background: linear-gradient(135deg, #f0f4ff 0%, #e8f3f9 50%, #fef5e7 100%);
                background-attachment: fixed;
                font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
                color: #1e3a5f;
                overflow-x: hidden;
                position: relative;
            }

            body::before {
                content: '';
                position: fixed;
                top: 0;
                left: 0;
                width: 100%;
                height: 100%;
                background-image:
                    radial-gradient(circle at 15% 20%, rgba(59, 130, 246, 0.04) 0%, transparent 50%),
                    radial-gradient(circle at 85% 80%, rgba(16, 185, 129, 0.04) 0%, transparent 50%),
                    radial-gradient(circle at 50% 50%, rgba(139, 92, 246, 0.03) 0%, transparent 50%);
                pointer-events: none;
                animation: subtleShift 15s ease infinite;
            }

            @keyframes subtleShift {

                0%,
                100% {
                    opacity: 1;
                }

                50% {
                    opacity: 0.8;
                }
            }

            /* Navigation */
            .nav-wrapper {
                position: fixed;
                top: 0;
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.9);
                backdrop-filter: blur(12px);
                -webkit-backdrop-filter: blur(12px);
                z-index: 1000;
                border-bottom: 1px solid rgba(59, 130, 246, 0.15);
                box-shadow: 0 2px 20px rgba(59, 130, 246, 0.08);
            }

            .nav {
                max-width: 1400px;
                margin: 0 auto;
                padding: 1rem 2rem;
                display: flex;
                justify-content: space-between;
                align-items: center;
                flex-wrap: wrap;
            }

            .nav-brand {
                font-size: 1.5rem;
                font-weight: 700;
                color: #1e40af;
                text-decoration: none;
                letter-spacing: -0.02em;
            }

            .nav-section {
                font-size: 0.9rem;
                font-weight: 500;
                margin-top: 0.2rem;
                color: #3b82f6;
            }

            .nav-section a {
                color: inherit;
                text-decoration: none;
                transition: color 0.3s ease;
            }

            .nav-section a:hover {
                color: #2563eb;
            }

            .nav-links {
                display: flex;
                list-style: none;
                gap: 2rem;
                flex-wrap: wrap;
            }

            .nav-links a {
                color: #1e40af;
                text-decoration: none;
                font-size: 0.95rem;
                font-weight: 500;
                transition: all 0.3s ease;
                position: relative;
                padding: 0.5rem 0;
            }

            .nav-links a::after {
                content: '';
                position: absolute;
                bottom: 0;
                left: 50%;
                transform: translateX(-50%);
                width: 0;
                height: 2px;
                background: linear-gradient(90deg, #3b82f6, #10b981);
                transition: width 0.3s ease;
            }

            .nav-links a:hover {
                color: #3b82f6;
            }

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

            /* Hero Section */
            .hero {
                margin-top: 100px;
                padding: 4rem 2rem 3rem;
                text-align: center;
                max-width: 1400px;
                margin-left: auto;
                margin-right: auto;
            }

            .hero h1 {
                font-size: clamp(2.5rem, 5vw, 4.5rem);
                font-weight: 800;
                margin-bottom: 1.5rem;
                background: linear-gradient(135deg, #1e40af 0%, #3b82f6 50%, #10b981 100%);
                -webkit-background-clip: text;
                background-clip: text;
                -webkit-text-fill-color: transparent;
                letter-spacing: -0.03em;
                animation: fadeInUp 0.8s ease;
            }

            .hero-svg-container {
                margin: 2.5rem auto;
                display: flex;
                justify-content: center;
                animation: fadeInUp 0.8s ease 0.2s backwards;
            }

            @keyframes fadeInUp {
                from {
                    opacity: 0;
                    transform: translateY(30px);
                }

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

            /* Language Selector */
            .lang-selector {
                display: inline-flex;
                gap: 0.5rem;
                background: rgba(255, 255, 255, 0.7);
                padding: 0.5rem;
                border-radius: 50px;
                backdrop-filter: blur(10px);
                -webkit-backdrop-filter: blur(10px);
                border: 1px solid rgba(59, 130, 246, 0.2);
                margin-bottom: 2rem;
            }

            .lang-selector a {
                color: #1e40af;
                text-decoration: none;
                padding: 0.6rem 1.5rem;
                border-radius: 50px;
                transition: all 0.3s ease;
                font-weight: 500;
            }

            .lang-selector .highlight a {
                background: linear-gradient(135deg, #3b82f6, #10b981);
                color: #ffffff;
                box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
            }

            .lang-selector a:hover:not(.highlight a) {
                background: rgba(59, 130, 246, 0.1);
                color: #2563eb;
            }

            /* Content Section */
            .content-section {
                max-width: 1400px;
                margin: 0 auto;
                padding: 2rem 2rem 4rem;
            }

            .research-list {
                display: grid;
                gap: 2rem;
                list-style: none;
                padding: 0;
            }

            .research-item {
                background: rgba(255, 255, 255, 0.8);
                backdrop-filter: blur(10px);
                -webkit-backdrop-filter: blur(10px);
                border-radius: 24px;
                padding: 2.5rem;
                transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
                border: 1px solid rgba(59, 130, 246, 0.15);
                position: relative;
                overflow: hidden;
                display: flex;
                flex-direction: column;
                gap: 1rem;
                animation: cardEntry 0.6s ease backwards;
            }

            .research-item:nth-child(1) {
                animation-delay: 0.1s;
            }

            .research-item:nth-child(2) {
                animation-delay: 0.15s;
            }

            .research-item:nth-child(3) {
                animation-delay: 0.2s;
            }

            .research-item:nth-child(4) {
                animation-delay: 0.25s;
            }

            .research-item:nth-child(5) {
                animation-delay: 0.3s;
            }

            .research-item:nth-child(6) {
                animation-delay: 0.35s;
            }

            .research-item:nth-child(7) {
                animation-delay: 0.4s;
            }

            .research-item:nth-child(8) {
                animation-delay: 0.45s;
            }

            .research-item:nth-child(9) {
                animation-delay: 0.5s;
            }

            .research-item:nth-child(10) {
                animation-delay: 0.55s;
            }

            @keyframes cardEntry {
                from {
                    opacity: 0;
                    transform: translateY(40px) scale(0.95);
                }

                to {
                    opacity: 1;
                    transform: translateY(0) scale(1);
                }
            }

            .research-item::before {
                content: '';
                position: absolute;
                top: -50%;
                left: -50%;
                width: 200%;
                height: 200%;
                background: radial-gradient(circle, rgba(59, 130, 246, 0.08) 0%, transparent 70%);
                opacity: 0;
                transition: opacity 0.4s ease;
                pointer-events: none;
            }

            .research-item::after {
                content: '';
                position: absolute;
                inset: 0;
                border-radius: 24px;
                padding: 1px;
                background: linear-gradient(135deg, rgba(59, 130, 246, 0.3), rgba(16, 185, 129, 0.3));
                -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
                mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
                -webkit-mask-composite: xor;
                mask-composite: exclude;
                opacity: 0;
                transition: opacity 0.4s ease;
                pointer-events: none;
            }

            .research-item:hover {
                transform: translateY(-8px) scale(1.01);
                box-shadow:
                    0 20px 40px rgba(59, 130, 246, 0.15),
                    0 10px 20px rgba(16, 185, 129, 0.1);
                border-color: rgba(59, 130, 246, 0.3);
            }

            .research-item:hover::before,
            .research-item:hover::after {
                opacity: 1;
            }

            .research-title {
                font-size: 2rem;
                font-weight: 700;
                color: #1e40af;
                letter-spacing: -0.02em;
                margin: 0;
                transition: all 0.3s ease;
            }

            .research-title a {
                color: inherit;
                text-decoration: none;
                border-bottom: 3px solid transparent;
                transition: all 0.3s ease;
                display: inline-block;
                padding-bottom: 0.3rem;
            }

            .research-item:hover .research-title a {
                background: linear-gradient(135deg, #2563eb, #10b981);
                -webkit-background-clip: text;
                background-clip: text;
                -webkit-text-fill-color: transparent;
                border-bottom-color: rgba(59, 130, 246, 0.3);
            }

            .research-description {
                font-size: 1.1rem;
                line-height: 1.8;
                color: #334155;
                margin: 0;
            }

            /* Icon decoration */
            .research-item::before {
                content: '';
                position: absolute;
                top: 2rem;
                right: 2rem;
                width: 60px;
                height: 60px;
                background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(16, 185, 129, 0.1));
                border-radius: 50% 40% 50% 40%;
                opacity: 0.5;
                animation: morph 8s ease-in-out infinite;
            }

            @keyframes morph {

                0%,
                100% {
                    border-radius: 50% 40% 50% 40%;
                    transform: rotate(0deg);
                }

                25% {
                    border-radius: 40% 50% 40% 50%;
                }

                50% {
                    border-radius: 50% 40% 60% 30%;
                    transform: rotate(10deg);
                }

                75% {
                    border-radius: 30% 60% 40% 50%;
                }
            }

            /* Footer */
            .footer {
                text-align: center;
                padding: 3rem 2rem;
                margin-top: 2rem;
                border-top: 1px solid rgba(59, 130, 246, 0.15);
                background: rgba(255, 255, 255, 0.5);
                backdrop-filter: blur(10px);
                -webkit-backdrop-filter: blur(10px);
            }

            .footer p {
                color: #1e40af;
                margin-bottom: 1rem;
            }

            .license-badge {
                display: inline-block;
                margin-top: 1rem;
                opacity: 0.8;
                transition: all 0.3s ease;
            }

            .license-badge:hover {
                opacity: 1;
                transform: scale(1.05);
            }

            /* Responsive Design */
            @media (max-width: 768px) {
                .nav {
                    flex-direction: column;
                    gap: 1rem;
                }

                .nav-links {
                    gap: 1rem;
                    font-size: 0.9rem;
                }

                .hero {
                    padding: 3rem 1.5rem 2rem;
                    margin-top: 120px;
                }

                .hero h1 {
                    font-size: 2.25rem;
                }

                .content-section {
                    padding: 2rem 1.5rem;
                }

                .research-item {
                    padding: 2rem;
                }

                .research-title {
                    font-size: 1.5rem;
                }

                .research-description {
                    font-size: 1rem;
                }
            }

            @media (max-width: 480px) {
                .nav-links {
                    gap: 0.5rem;
                    justify-content: center;
                }

                .lang-selector {
                    flex-direction: column;
                    gap: 0.5rem;
                }
            }
/* Shared language-version footer */
.language-switcher { margin: 0 auto 1.5rem; }
.language-switcher-list { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.5rem; padding: 0; list-style: none; }
.language-switcher a { display: inline-block; padding: 0.45rem 0.75rem; border: 1px solid currentColor; border-radius: 999px; color: inherit; text-decoration: none; opacity: 0.8; }
.language-switcher a:hover, .language-switcher a:focus-visible, .language-switcher a[aria-current="page"] { opacity: 1; text-decoration: underline; }