:root {
            --primary-color: #0066cc;
            --secondary-color: #ff9900;
            --tertiary-color: #16d6ff;
            --dark-bg: #1a1a1a;
            --dark-card: rgba(25, 25, 30, 0.95);
            --dark-text: #001029;
            --light-bg: #f5f5f5;
            --light-card: rgba(240, 240, 245, 0.95);
            --light-text: #333333;
            --border-radius: 8px;
            --transition: all 0.3s ease;
            --logo-shadow-dark: 0 15px 30px rgba(0, 0, 0, 0.7);
            --logo-shadow-light: 0 12px 25px rgba(0, 0, 0, 0.3);
            --logo-shadow-hover: 0 20px 40px rgba(0, 0, 0, 0.9);
            --logo-shadow-hover-light: 0 15px 30px rgba(0, 0, 0, 0.5);
            --footer-bg: #32343b;
        }

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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-image: url("../images/background.jpg");
            color: var(--light-text);
            min-height: 100vh;
            position: relative;
            transition: var(--transition);
            background-size: cover;
            background-position: center;
            overflow-x: hidden;
        }

        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: inherit;
            z-index: -1;
            filter: brightness(1.05) contrast(1.05);
        }

        body.light-mode {
            background-image: url("../images/background.jpg");
            color: var(--dark-text);
        }

        body.light-mode::before {
            background: linear-gradient(135deg, rgba(245, 247, 250, 0.4) 0%, rgba(228, 232, 240, 0.4) 100%),
                url("../images/background.jpg");
            background-size: cover;
            background-position: center;
            filter: brightness(1.0) saturate(1.1);
        }

        .scene {
            position: fixed;
            width: 100%;
            height: 100%;
            top: 0;
            left: 0;
            z-index: -1;
            overflow: hidden;
        }

        .bg-layer {
            position: absolute;
            width: 110%;
            height: 110%;
            top: -5%;
            left: -5%;
            background: radial-gradient(circle at center, #3a3a3a70 0%, #2a2a2a80 100%);
            opacity: 0.7;
        }

        .light-mode .bg-layer {
            background: radial-gradient(circle at center, #f0f0f000 0%, #e0e0e000 100%);
            opacity: 0.7;
        }

        .overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, rgba(0, 0, 0, 0.6) 0%, rgba(0, 0, 0, 0.3) 100%);
            z-index: 1;
            pointer-events: none;
        }

        .light-mode .overlay {
            background: linear-gradient(135deg, rgba(255, 255, 255, 0.7) 0%, rgba(255, 255, 255, 0.4) 100%);
        }

        .overlay::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" preserveAspectRatio="none"><path d="M0,0 L100,0 L100,100 Z" fill="rgba(0,0,0,0.05)"/></svg>');
            background-size: 100% 100%;
            opacity: 0.3;
        }

        .light-mode .overlay::after {
            background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" preserveAspectRatio="none"><path d="M0,0 L100,0 L100,100 Z" fill="rgba(255,255,255,0.2)"/></svg>');
        }

        .light-mode .overlay {
            background: radial-gradient(circle at center, rgba(255, 255, 255, 0.3) 0%, rgba(255, 255, 255, 0.8) 100%);
        }

        .mode-toggle-wrapper {
            position: fixed;
            top: 15px;
            right: 15px;
            z-index: 100;
            display: flex;
            align-items: center;
        }

        .mode-label {
            margin-right: 10px;
            font-size: 14px;
            color: #fff;
            text-shadow: 0 0 5px rgba(0, 0, 0, 0.5);
        }

        .light-mode .mode-label {
            color: var(--dark-text);
            text-shadow: 0 0 5px rgba(255, 255, 255, 0.5);
        }

        .mode-toggle-btn {
            background-color: rgb(43, 43, 43);
            color: rgb(255, 255, 255);
            border: none;
            padding: 5px 15px;
            border-radius: 15px;
            cursor: pointer;
            transition: all 0.3s;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
        }

        .light-mode .mode-toggle-btn {
            background-color: var(--light-bg);
            color: var(--dark-text);
        }

        .main-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
            position: relative;
            z-index: 10;
            display: flex;
            flex-direction: column;
            align-items: center;
            margin-top: 80px;
        }

        .logo-container {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin: 40px 0 30px;
            width: 100%;
            flex-wrap: wrap;
        }

        .brand-logo {
            width: 30%;
            max-width: 200px;
            min-width: 100px;
            cursor: pointer;
            border-radius: 22px;
            padding: 5px;
            transition: all 0.3s ease;
            object-fit: contain;
        }

        .light-mode .brand-logo {
            box-shadow: var(--logo-shadow-light);
            background: rgba(0, 0, 0, 0.2);
        }

        .brand-logo:hover {
            transform: scale(1.05);
            box-shadow: 0 12px 30px rgba(33, 150, 243, 0.8);
        }

        .light-mode .brand-logo:hover {
            box-shadow: var(--logo-shadow-hover-light);
        }

        .brand-logo:nth-child(1) {
            box-shadow: 0 0px 30px rgba(33, 150, 243, 0.8);
        }

        .brand-logo:nth-child(1):hover {
            box-shadow: 0 0px 30px rgba(255, 0, 0, 0.6);
        }

        .brand-logo:nth-child(2) {
            box-shadow: 0 0px 30px rgba(33, 150, 243, 0.8);
        }

        .brand-logo:nth-child(2):hover {
            box-shadow: 0 0px 30px rgba(255, 0, 0, 0.6);
        }

        .brand-logo:nth-child(3) {
            box-shadow: 0 0px 30px rgba(33, 150, 243, 0.8);
        }

        .brand-logo:nth-child(3):hover {
            box-shadow: 0 0px 30px rgba(255, 0, 0, 0.6);
        }

        .buttons-row {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin-bottom: 40px;
            width: 100%;
            flex-wrap: wrap;
        }

        .btn-container {
            animation: fadeInUp 0.6s ease-out;
            display: flex;
            justify-content: center;
        }

        .platform-btn {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 220px;
            height: 55px;
            font-size: 18px;
            font-weight: bold;
            color: #FFFFFF;
            border-radius: 22px;
            margin-bottom: 0;
            transition: var(--transition);
            border: none;
            cursor: pointer;
            position: relative;
            overflow: hidden;
            box-shadow: 0 4px 15px rgba(255, 0, 0, 0.6);
            text-decoration: none;
            flex-shrink: 0;
            padding: 0 15px;
        }

        .platform-btn::after {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            transition: 0.5s;
            background: var(--btn-gradient);
            background-size: 200% auto;
        }

        .platform-btn:hover::after {
            left: 100%;
        }

        .btn-ky {
            background: linear-gradient(135deg, #3a7bd5, #16d6ff);
        }

        .btn-ky:hover {
            background: linear-gradient(135deg, #3a7bd5, #16d6ff);
            box-shadow: 0 0 15px rgba(255, 0, 0, 0.8);
            transform: translateY(-2px);
        }

        .btn-ayx {
            background: linear-gradient(135deg, #3a7bd5, #16d6ff);
        }

        .btn-ayx:hover {
            background: linear-gradient(135deg, #3a7bd5, #16d6ff);
            box-shadow: 0 0 15px rgba(255, 0, 0, 0.8);
            transform: translateY(-2px);
        }

        .btn-jy {
            background: linear-gradient(135deg, #3a7bd5, #16d6ff);
        }

        .btn-jy:hover {
            background: linear-gradient(135deg, #3a7bd5, #16d6ff);
            box-shadow: 0 0 15px rgba(255, 0, 0, 0.8);
            transform: translateY(-2px);
        }

        .btn-logo {
            width: 30px;
            height: 30px;
            margin-right: 10px;
            object-fit: contain;
            border-radius: 5px;
        }

        .backup-button-container {
            display: flex;
            justify-content: center;
            margin: 30px 0;
            animation: fadeIn 1s ease-out;
            width: 100%;
            opacity: 0;
            transform: translateY(30px);
        }

        .backup-url-btn {
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, #e6b800, #ff9900);
            color: #000;
            border: none;
            padding: 12px 30px;
            border-radius: 30px;
            font-size: 16px;
            font-weight: bold;
            cursor: pointer;
            box-shadow: 0 5px 20px rgba(255, 153, 0, 0.4);
            transition: var(--transition);
            overflow: hidden;
            z-index: 1;
        }

        .backup-url-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(255, 153, 0, 0.5);
        }

        .backup-url-btn:active {
            transform: translateY(1px);
        }

        .pulse-effect {
            position: absolute;
            width: 100%;
            height: 100%;
            top: 0;
            left: 0;
            background: rgba(255, 255, 255, 0.3);
            border-radius: 30px;
            animation: pulse 2s infinite;
            pointer-events: none;
            z-index: -1;
        }

        .footer {
            text-align: center;
            color: #a2a2a2;
            font-size: 14px;
            margin-top: 30px;
            padding: 20px 0;
            width: 100%;
        }

        .light-mode .footer {
            color: #666;
        }

        .backup-links-popup {
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            background: var(--dark-card);
            border: 1px solid #444;
            border-radius: 10px;
            padding: 20px;
            z-index: 1000;
            width: 90%;
            max-width: 400px;
            box-shadow: 0 5px 30px rgba(0, 0, 0, 0.5);
            animation: popIn 0.3s ease-out;
        }

        .light-mode .backup-links-popup {
            background: var(--light-card);
            border: 1px solid #ddd;
        }

        .backup-links-popup h3 {
            color: var(--light-text);
            margin-top: 0;
            text-align: center;
            margin-bottom: 20px;
            border-bottom: 1px solid #444;
            padding-bottom: 10px;
        }

        .light-mode .backup-links-popup h3 {
            color: var(--light-text);
            border-bottom: 1px solid #ddd;
        }

        .backup-link {
            display: block;
            background: linear-gradient(135deg, #333, #222);
            color: #fff;
            padding: 12px 15px;
            margin: 10px 0;
            border-radius: 5px;
            text-decoration: none;
            text-align: center;
            transition: var(--transition);
            font-weight: bold;
        }

        .light-mode .backup-link {
            background: linear-gradient(135deg, #f0f0f0, #e0e0e0);
            color: #333;
        }

        .backup-link:hover {
            background: linear-gradient(135deg, #444, #333);
            transform: translateY(-2px);
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
        }

        .light-mode .backup-link:hover {
            background: linear-gradient(135deg, #e0e0e0, #d0d0d0);
        }

        .close-popup {
            position: absolute;
            top: 10px;
            right: 15px;
            color: #999;
            font-size: 24px;
            cursor: pointer;
            transition: color 0.3s;
            background: none;
            border: none;
            width: 30px;
            height: 30px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .close-popup:hover {
            color: #fff;
            transform: rotate(90deg);
        }

        .light-mode .close-popup:hover {
            color: #333;
        }

        .promo-text-container {
            display: flex;
            justify-content: center;
            margin: 20px 0;
            width: 100%;
            opacity: 0;
            transform: translateY(30px);
            animation: fadeInUp 0.8s ease-out 1.2s forwards;
        }

        .promo-text {
            text-align: center;
            font-size: 18px;
            font-weight: bold;
            color: #FFFFFF;
            padding: 15px 25px;
            border-radius: 30px;
            background: linear-gradient(135deg, rgba(0, 102, 204, 0.7), rgba(22, 214, 255, 0.7));
            backdrop-filter: blur(10px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
            max-width: 90%;
            user-select: none;
            -webkit-user-select: none;
            -moz-user-select: none;
            -ms-user-select: none;
            pointer-events: none;
            cursor: default;
        }

        .light-mode .promo-text {
            color: #FFFFFF;
            background: linear-gradient(135deg, rgba(58, 123, 213, 0.7), rgba(22, 214, 255, 0.7));
            user-select: none;
            -webkit-user-select: none;
            -moz-user-select: none;
            -ms-user-select: none;
            pointer-events: none;
            cursor: default;
        }

        .features-container {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
            width: 100%;
            max-width: 1200px;
            margin: 40px 0;
            justify-content: center;
            user-select: none;
            pointer-events: none;
        }

        .feature {
            background: rgba(255, 255, 255, 0.05);
            backdrop-filter: blur(10px);
            border-radius: 22px;
            padding: 30px 25px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
            border: 1px solid rgba(255, 255, 255, 0.1);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            opacity: 0;
            min-height: 210px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            cursor: default;
        }

        .feature:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
            background: rgba(255, 255, 255, 0.08);
        }

        .feature-icon {
            font-size: 2.8rem;
            margin-bottom: 20px;
            display: flex;
            justify-content: center;
            background: linear-gradient(135deg, #3a7bd5, #16d6ff);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            color: #3a7bd5;
        }

        .feature h3 {
            font-size: 1.8rem;
            margin-bottom: 15px;
            text-align: center;
            color: var(--primary-color);
        }

        .light-mode .feature h3 {
            color: #2c3e50;
        }

        .feature p {
            color: #d0d0d0;
            line-height: 1.6;
            text-align: center;
            flex-grow: 1;
        }

        .light-mode .feature p {
            color: var(--dark-text);
        }

        .clear {
            clear: both;
        }

        .notice {
            text-align: center;
            margin: 30px auto;
            padding: 15px 25px;
            width: 90%;
            max-width: 800px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 12px;
            border: 1px solid rgba(255, 255, 255, 0.2);
            font-size: 16px;
            line-height: 1.6;
            backdrop-filter: blur(10px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
            color: #fff;
            transition: var(--transition);
            border-left: 5px solid var(--tertiary-color);
            user-select: none;
            -webkit-user-select: none;
            -moz-user-select: none;
            -ms-user-select: none;
            pointer-events: none;
            cursor: default;
        }

        .light-mode .notice {
            background: rgba(0, 102, 204, 0.05);
            border: 1px solid rgba(0, 0, 0, 0.1);
            color: var(--dark-text);
            border-left: 5px solid var(--tertiary-color);
            user-select: none;
            -webkit-user-select: none;
            -moz-user-select: none;
            -ms-user-select: none;
            pointer-events: none;
            cursor: default;
        }

        .footer {
            background: var(--footer-bg);
            padding: 40px 0 20px;
            margin-top: 60px;
            width: 100%;
            text-align: center;
        }

        .light-mode .footer {
            background: #e2e8f0;
        }

        .licenses {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 15px;
            margin-bottom: 30px;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding: 0 20px;
        }

        .license-wrapper {
            width: 100px;
            height: 100px;
            perspective: 1000px;
            position: relative;
        }

        .license-img {
            width: 100%;
            height: 100%;
            object-fit: contain;
            backface-visibility: hidden;
            position: absolute;
            top: 0;
            left: 0;
            transition: transform 0.6s;
            border-radius: 8px;
            background: none;
            padding: 5px;
        }

        .light-mode .license-img {
            background: none;
        }

        .front {
            transform: rotateY(0deg);
        }

        .back {
            transform: rotateY(180deg);
        }

        .license-wrapper:hover .front {
            transform: rotateY(-180deg);
        }

        .license-wrapper:hover .back {
            transform: rotateY(0deg);
        }

        .footer-text {
            text-align: center;
            max-width: 900px;
            margin: 0 auto 20px;
            color: #d0d0d0;
            font-size: 0.9rem;
            line-height: 1.7;
            padding: 0 20px;
            user-select: none;
            -webkit-user-select: none;
            -moz-user-select: none;
            -ms-user-select: none;
            pointer-events: none;
            cursor: default;
        }

        .light-mode .footer-text {
            color: #555;
            user-select: none;
            -webkit-user-select: none;
            -moz-user-select: none;
            -ms-user-select: none;
            pointer-events: none;
            cursor: default;
        }

        .copyright {
            text-align: center;
            color: #cccccc;
            font-size: 0.85rem;
            padding: 0 20px;
            user-select: none;
            -webkit-user-select: none;
            -moz-user-select: none;
            -ms-user-select: none;
            pointer-events: none;
            cursor: default;
        }

        .light-mode .copyright {
            color: #121212;
            user-select: none;
            -webkit-user-select: none;
            -moz-user-select: none;
            -ms-user-select: none;
            pointer-events: none;
            cursor: default;
        }

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

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

        @keyframes fadeIn {
            from {
                opacity: 0;
            }

            to {
                opacity: 1;
            }
        }

        @keyframes popIn {
            from {
                opacity: 0;
                transform: translate(-50%, -50%) scale(0.8);
            }

            to {
                opacity: 1;
                transform: translate(-50%, -50%) scale(1);
            }
        }

        @keyframes pulse {
            0% {
                transform: scale(1);
                opacity: 0.8;
            }

            50% {
                transform: scale(1.05);
                opacity: 0.5;
            }

            100% {
                transform: scale(1);
                opacity: 0.8;
            }
        }

        @media (max-width: 768px) {
            .licenses {
                gap: 10px;
            }

            .license-wrapper {
                width: 80px;
                height: 80px;
            }

            .promo-text {
                font-size: 16px;
                padding: 12px 20px;
            }

            .footer {
                padding: 30px 0 15px;
                margin-top: 40px;
            }

            .features-container {
                grid-template-columns: 1fr;
                gap: 20px;
            }

            .buttons-row {
                flex-direction: column;
                align-items: center;
            }

            .brand-logo {
                width: 55%;
                max-width: 220px;
                min-width: 160px;
                margin: 6px;
            }

            .logo-container {
                gap: 12px;
                margin: 15px 0 10px;
            }

            .main-container {
                margin-top: 40px;
                padding: 10px;
            }
        }

        @media (max-width: 480px) {
            .license-wrapper {
                width: 70px;
                height: 70px;
            }

            .promo-text {
                font-size: 14px;
                padding: 10px 15px;
                line-height: 1.4;
            }

            .footer-text {
                font-size: 0.8rem;
            }

            .copyright {
                font-size: 0.75rem;
            }

            .brand-logo {
                width: 80%;
                max-width: 260px;
                min-width: 140px;
                margin: 4px;
            }

            .logo-container {
                gap: 10px;
                margin: 15px 0 10px;
                flex-direction: column;
                align-items: center;
            }

            .buttons-row {
                margin-bottom: 25px;
            }

            .features-container {
                margin: 25px 0;
            }

            .notice {
                margin: 20px auto;
                padding: 12px 20px;
            }
        }