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

            body {
                background: linear-gradient(135deg, #0a0a1f 0%, #1a1a3e 50%, #0f0f2e 100%);
                color: #e0e0e0;
                font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
                overflow-x: hidden;
                position: relative;
            }

            /* Animated background particles */
            body::before {
                content: '';
                position: fixed;
                top: 0;
                left: 0;
                width: 100%;
                height: 100%;
                background-image:
                    radial-gradient(circle at 20% 30%, rgba(142, 68, 173, 0.1) 0%, transparent 50%),
                    radial-gradient(circle at 80% 70%, rgba(52, 152, 219, 0.1) 0%, transparent 50%);
                pointer-events: none;
                animation: particleFloat 20s ease-in-out infinite;
                z-index: 0;
            }

            @keyframes particleFloat {

                0%,
                100% {
                    transform: translate(0, 0);
                }

                25% {
                    transform: translate(20px, -20px);
                }

                50% {
                    transform: translate(-15px, 15px);
                }

                75% {
                    transform: translate(15px, 10px);
                }
            }

            /* Navigation Bar */
            .navbar {
                position: fixed;
                top: 0;
                left: 0;
                width: 100%;
                background: rgba(10, 10, 31, 0.95);
                -webkit-backdrop-filter: blur(10px);
                backdrop-filter: blur(10px);
                border-bottom: 2px solid rgba(142, 68, 173, 0.3);
                padding: 1rem 2rem;
                z-index: 1000;
                display: flex;
                justify-content: space-between;
                align-items: center;
                box-shadow: 0 4px 20px rgba(142, 68, 173, 0.2);
            }

            .navbar-brand {
                font-size: 1.5rem;
                font-weight: bold;
                background: linear-gradient(135deg, #8E44AD, #3498db);
                -webkit-background-clip: text;
                -webkit-text-fill-color: transparent;
                background-clip: text;
                text-decoration: none;
                letter-spacing: 1px;
                position: relative;
                padding: 0.5rem 1rem;
                border: 2px solid transparent;
                border-radius: 8px;
                transition: all 0.3s ease;
            }

            .navbar-brand::before {
                content: '';
                position: absolute;
                top: 0;
                left: 0;
                right: 0;
                bottom: 0;
                border-radius: 8px;
                padding: 2px;
                background: linear-gradient(135deg, #8E44AD, #3498db);
                -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 0.3s ease;
            }

            .navbar-brand:hover::before {
                opacity: 1;
            }

            .breadcrumb {
                display: flex;
                list-style: none;
                gap: 1rem;
                align-items: center;
            }

            .breadcrumb li a {
                color: #b0b0c0;
                text-decoration: none;
                padding: 0.5rem 1rem;
                border-radius: 6px;
                transition: all 0.3s ease;
                position: relative;
                overflow: hidden;
            }

            .breadcrumb li a::before {
                content: '';
                position: absolute;
                top: 50%;
                left: 50%;
                width: 0;
                height: 0;
                border-radius: 50%;
                background: rgba(142, 68, 173, 0.2);
                transform: translate(-50%, -50%);
                transition: width 0.3s ease, height 0.3s ease;
            }

            .breadcrumb li a:hover::before {
                width: 100%;
                height: 100%;
                border-radius: 6px;
            }

            .breadcrumb li a:hover {
                color: #8E44AD;
            }

            .breadcrumb li:not(:last-child)::after {
                content: '›';
                color: #8E44AD;
                margin-left: 1rem;
            }

            /* Hero Section */
            .hero {
                margin-top: 80px;
                padding: 4rem 2rem;
                text-align: center;
                position: relative;
                z-index: 1;
            }

            .hero-svg {
                width: 100%;
                max-width: 800px;
                height: auto;
                margin: 0 auto 2rem;
                display: block;
                opacity: 0.9;
            }

            .hero-svg .lang-node circle {
                transition: all 0.3s ease;
            }

            .hero-svg .lang-node:hover circle {
                r: 40;
                stroke-width: 3;
            }

            .hero-svg .lang-node text {
                pointer-events: none;
            }

            .hero-title {
                font-size: 3.5rem;
                font-weight: 700;
                background: linear-gradient(135deg, #8E44AD, #3498db, #8E44AD);
                background-size: 200% auto;
                -webkit-background-clip: text;
                -webkit-text-fill-color: transparent;
                background-clip: text;
                animation: gradientShift 3s ease infinite;
                margin-bottom: 1rem;
                text-shadow: 0 0 30px rgba(142, 68, 173, 0.3);
            }

            @keyframes gradientShift {

                0%,
                100% {
                    background-position: 0% 50%;
                }

                50% {
                    background-position: 100% 50%;
                }
            }

            .hero-subtitle {
                font-size: 1.5rem;
                color: #b0b0c0;
                margin-bottom: 2rem;
            }

            .hero-subtitle a {
                color: #3498db;
                text-decoration: none;
                position: relative;
                transition: color 0.3s ease;
            }

            .hero-subtitle a::after {
                content: '';
                position: absolute;
                bottom: -2px;
                left: 0;
                width: 0;
                height: 2px;
                background: linear-gradient(90deg, #8E44AD, #3498db);
                transition: width 0.3s ease;
            }

            .hero-subtitle a:hover {
                color: #8E44AD;
            }

            .hero-subtitle a:hover::after {
                width: 100%;
            }

            /* Content Container */
            .container {
                max-width: 1200px;
                margin: 0 auto;
                padding: 2rem;
                position: relative;
                z-index: 1;
            }

            /* Content Card */
            .content-card {
                background: rgba(26, 26, 62, 0.6);
                -webkit-backdrop-filter: blur(10px);
                backdrop-filter: blur(10px);
                border-radius: 20px;
                padding: 3rem;
                margin-bottom: 2rem;
                border: 1px solid rgba(142, 68, 173, 0.2);
                box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
                position: relative;
                overflow: hidden;
            }

            .content-card::before {
                content: '';
                position: absolute;
                top: -2px;
                left: -2px;
                right: -2px;
                bottom: -2px;
                background: linear-gradient(45deg, #8E44AD, #3498db, #8E44AD);
                background-size: 400% 400%;
                border-radius: 20px;
                z-index: -1;
                opacity: 0;
                transition: opacity 0.3s ease;
                animation: borderGlow 3s ease infinite;
            }

            @keyframes borderGlow {

                0%,
                100% {
                    background-position: 0% 50%;
                }

                50% {
                    background-position: 100% 50%;
                }
            }

            .content-card:hover::before {
                opacity: 0.3;
            }

            .content-card p {
                line-height: 1.8;
                font-size: 1.1rem;
                margin-bottom: 1.5rem;
                color: #d0d0d0;
            }

            .content-card p i {
                display: block;
                padding: 2rem;
                background: rgba(142, 68, 173, 0.1);
                border-left: 4px solid #8E44AD;
                border-radius: 8px;
                margin-bottom: 2rem;
                font-style: italic;
                color: #b0b0c0;
            }

            .content-card a {
                color: #3498db;
                text-decoration: none;
                position: relative;
                transition: color 0.3s ease;
            }

            .content-card a::after {
                content: '';
                position: absolute;
                bottom: -2px;
                left: 0;
                width: 0;
                height: 1px;
                background: linear-gradient(90deg, #8E44AD, #3498db);
                transition: width 0.3s ease;
            }

            .content-card a:hover {
                color: #8E44AD;
            }

            .content-card a:hover::after {
                width: 100%;
            }

            .content-card sup a {
                font-size: 0.8rem;
                padding: 0 0.2rem;
            }

            /* References Section */
            .references {
                background: rgba(142, 68, 173, 0.05);
                border-radius: 15px;
                padding: 2rem;
                margin-top: 2rem;
            }

            .references h3 {
                font-size: 2rem;
                background: linear-gradient(135deg, #8E44AD, #3498db);
                -webkit-background-clip: text;
                -webkit-text-fill-color: transparent;
                background-clip: text;
                margin-bottom: 1.5rem;
            }

            .references ol {
                list-style-position: inside;
                padding-left: 1rem;
            }

            .references li {
                margin-bottom: 1rem;
                line-height: 1.6;
                color: #d0d0d0;
            }

            .references li::marker {
                color: #8E44AD;
                font-weight: bold;
            }

            /* Footer */
            .footer {
                background: linear-gradient(135deg, rgba(10, 10, 31, 0.95), rgba(26, 26, 62, 0.95));
                -webkit-backdrop-filter: blur(10px);
                backdrop-filter: blur(10px);
                border-top: 2px solid rgba(142, 68, 173, 0.3);
                padding: 3rem 2rem 1.5rem;
                margin-top: 4rem;
                position: relative;
                z-index: 1;
            }

            .footer-content {
                max-width: 1200px;
                margin: 0 auto;
                display: grid;
                grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
                gap: 2rem;
                margin-bottom: 2rem;
            }

            .footer-section h4 {
                color: #8E44AD;
                font-size: 1.2rem;
                margin-bottom: 1rem;
                position: relative;
                padding-bottom: 0.5rem;
            }

            .footer-section h4::after {
                content: '';
                position: absolute;
                bottom: 0;
                left: 0;
                width: 50px;
                height: 2px;
                background: linear-gradient(90deg, #8E44AD, #3498db);
            }

            .footer-section p,
            .footer-section a {
                color: #b0b0c0;
                text-decoration: none;
                line-height: 1.8;
                transition: color 0.3s ease;
            }

            .footer-section a:hover {
                color: #3498db;
            }

            .footer-bottom {
                max-width: 1200px;
                margin: 0 auto;
                padding-top: 2rem;
                border-top: 1px solid rgba(142, 68, 173, 0.2);
                display: flex;
                justify-content: space-between;
                align-items: center;
                flex-wrap: wrap;
                gap: 1rem;
            }

            .footer-bottom p {
                color: #808090;
                font-size: 0.9rem;
            }

            .license-badge {
                transition: transform 0.3s ease;
            }

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

            .license-badge img {
                height: 31px;
                width: auto;
            }

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

                .navbar-brand {
                    font-size: 1.2rem;
                }

                .breadcrumb {
                    flex-wrap: wrap;
                    justify-content: center;
                }

                .hero-svg {
                    max-width: 100%;
                    height: 250px;
                }

                .hero-title {
                    font-size: 2.5rem;
                }

                .hero-subtitle {
                    font-size: 1.2rem;
                }

                .content-card {
                    padding: 1.5rem;
                }

                .content-card p {
                    font-size: 1rem;
                }

                .footer-content {
                    grid-template-columns: 1fr;
                }

                .footer-bottom {
                    flex-direction: column;
                    text-align: center;
                }
            }

            /* Smooth scrolling */
            html {
                scroll-behavior: smooth;
            }

            /* Selection color */
            ::selection {
                background: rgba(142, 68, 173, 0.3);
                color: #fff;
            }
/* 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; }