:root {
            --primary-color: #4a55ff;
            --secondary-color: #7b3fe4;
            --accent-color: #ff3b8e;
            --dark-color: #1c1f3a;
            --light-color: #ffffff;
            --gray-color: #5f6a7d;
            --gradient-1: linear-gradient(135deg, #4a55ff, #7b3fe4);
            --gradient-2: linear-gradient(135deg, #ff3b8e, #ff8c3b);
            --shadow-soft: 0 8px 24px rgba(74, 85, 255, 0.15);
            --shadow-strong: 0 12px 32px rgba(74, 85, 255, 0.25);
            --border-radius: 14px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
  font-family: "Space Grotesk", sans-serif;
        }

        body {
            background-color: #f9faff;
            color: var(--dark-color);
            line-height: 1.5;
            overflow-x: hidden;
            font-size: 14px;
        }

        .container {
            width: 100%;
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 12px;
        }

        nav {
            background-color: var(--light-color);
            box-shadow: 0 3px 15px rgba(0, 0, 0, 0.06);
            position: sticky;
            top: 0;
            z-index: 1000;
            padding: 8px 0;
        }

        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 12px 0;
        }

        .logo {
            font-size: 24px;
            font-weight: 800;
            color: var(--primary-color);
            text-decoration: none;
            display: flex;
            align-items: center;
            transition: transform 0.3s ease;
        }

        .logo:hover {
            transform: scale(1.03);
        }

        .logo i {
            margin-right: 8px;
            font-size: 26px;
            background: var(--gradient-1);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .nav-menu {
            display: flex;
            list-style: none;
            align-items: center;
        }

        .nav-item {
            margin-left: 28px;
        }

        .nav-link {
            color: var(--dark-color);
            text-decoration: none;
            font-weight: 600;
            position: relative;
            padding: 4px 0;
            transition: color 0.3s ease;
            font-size: 14px;
        }

        .nav-link.active {
            color: var(--primary-color);
        }

        .nav-link::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: 0;
            width: 0;
            height: 2px;
            background: var(--gradient-1);
            transition: width 0.3s ease;
        }

        .nav-link:hover {
            color: var(--primary-color);
        }

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

        .nav-button {
            background: var(--gradient-1);
            color: var(--light-color);
            text-decoration: none;
            border: none;
            padding: 10px 20px;
            border-radius: 40px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 12px rgba(74, 85, 255, 0.3);
            display: flex;
            align-items: center;
            font-size: 14px;
        }

        .nav-button i {
            margin-right: 6px;
            font-size: 14px;
        }

        .nav-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(74, 85, 255, 0.4);
        }

        .hamburger {
            display: none;
            cursor: pointer;
            font-size: 22px;
            color: var(--primary-color);
        }

        .page-section {
            padding: 40px 0;
        }

        .page-title {
            text-align: center;
            margin-bottom: 25px;
            font-size: 2.2rem;
            color: var(--dark-color);
            position: relative;
            font-weight: 800;
            text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        }

        .page-title::after {
            content: "";
            display: block;
            width: 80px;
            height: 4px;
            background: var(--gradient-1);
            margin: 10px auto;
            border-radius: 8px;
        }

        .page-content {
            background: var(--light-color);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-soft);
            padding: 24px;
            border: 2px solid rgba(74, 85, 255, 0.2);
            animation: fadeIn 0.5s ease-in forwards;
        }

        .page-content h2 {
            font-size: 1.8rem;
            color: var(--dark-color);
            margin-bottom: 16px;
            font-weight: 700;
        }

        .page-content h3 {
            font-size: 1.4rem;
            color: var(--dark-color);
            margin: 20px 0 12px;
            font-weight: 600;
        }

        .page-content p {
            font-size: 14px;
            color: var(--gray-color);
            margin-bottom: 16px;
            line-height: 1.6;
        }

        .page-content a {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 600;
            transition: color 0.3s ease;
        }

        .page-content a:hover {
            color: var(--secondary-color);
        }

        .no-page-card {
            background: var(--light-color);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-soft);
            padding: 24px;
            text-align: center;
            max-width: 500px;
            margin: 0 auto;
            border: 2px solid rgba(74, 85, 255, 0.2);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            animation: fadeIn 0.5s ease-in 0.3s forwards;
            opacity: 0;
        }

        .no-page-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-strong);
        }

        .no-page-card i {
            font-size: 36px;
            color: var(--accent-color);
            margin-bottom: 16px;
            background: var(--gradient-2);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .no-page-card h3 {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--dark-color);
            margin-bottom: 12px;
        }

        .no-page-card p {
            font-size: 14px;
            color: var(--gray-color);
            margin-bottom: 20px;
            line-height: 1.6;
        }

        .no-page-card .back-button {
            background: var(--gradient-1);
            color: var(--light-color);
            border: none;
            padding: 10px 20px;
            border-radius: 40px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 12px rgba(74, 85, 255, 0.3);
            display: inline-flex;
            align-items: center;
            font-size: 13px;
            text-decoration: none;
        }

        .no-page-card .back-button i {
            margin-right: 6px;
            font-size: 13px;
            background: none;
            -webkit-text-fill-color: var(--light-color);
        }

        .no-page-card .back-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(74, 85, 255, 0.4);
        }

        footer {
            background-color: var(--dark-color);
            color: var(--light-color);
            padding: 50px 0 20px;
            position: relative;
            overflow: hidden;
        }

        footer::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 8px;
            background: var(--gradient-1);
        }

        .footer-container {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-bottom: 30px;
            position: relative;
            padding: 0 12px;
        }

        .footer-column {
            min-width: 180px;
        }

        .footer-column h3 {
            font-size: 18px;
            margin-bottom: 18px;
            position: relative;
            font-weight: 700;
        }

        .footer-column h3::after {
            content: "";
            display: block;
            width: 40px;
            height: 2px;
            background: var(--gradient-2);
            margin-top: 10px;
            border-radius: 2px;
        }

        .footer-links {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: 12px;
        }

        .footer-links a {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            transition: all 0.3s ease;
            position: relative;
            padding-left: 12px;
            font-size: 13px;
        }

        .footer-links a::before {
            content: "→";
            position: absolute;
            left: 0;
            opacity: 0;
            transform: translateX(-8px);
            transition: all 0.3s ease;
        }

        .footer-links a:hover {
            color: var(--light-color);
            padding-left: 16px;
        }

        .footer-links a:hover::before {
            opacity: 1;
            transform: translateX(0);
        }

        .social-links {
            display: flex;
            gap: 12px;
            margin-top: 18px;
        }

        .social-link {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 35px;
            height: 35px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            color: var(--light-color);
            text-decoration: none;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
            touch-action: manipulation;
        }

        .social-link::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: var(--gradient-2);
            opacity: 0;
            transition: opacity 0.3s ease;
            z-index: -1;
        }

        .social-link:hover {
            transform: translateY(-3px);
        }

        .social-link:hover::before {
            opacity: 1;
        }

        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: rgba(255, 255, 255, 0.6);
            font-size: 12px;
            margin-top: 15px;
        }

        .toast {
            position: fixed;
            bottom: 25px;
            left: 50%;
            transform: translateX(-50%) translateY(80px);
            background-color: var(--dark-color);
            color: var(--light-color);
            padding: 10px 20px;
            border-radius: 40px;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
            z-index: 1000;
            opacity: 0;
            transition: all 0.3s ease;
            font-size: 13px;
            max-width: 90%;
        }

        .toast.show {
            transform: translateX(-50%) translateY(0);
            opacity: 1;
        }

        .toast i {
            margin-right: 8px;
            color: var(--accent-color);
            font-size: 14px;
        }

        .fade-in-delay-2 {
            animation: fadeIn 0.5s ease-in 0.3s forwards;
            opacity: 0;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(15px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .scroll-top {
            position: fixed;
            bottom: 25px;
            right: 25px;
            width: 45px;
            height: 45px;
            background: var(--primary-color);
            border-radius: 50%;
            color: var(--light-color);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            opacity: 0;
            transform: translateY(15px);
            transition: all 0.3s ease;
            z-index: 99;
            touch-action: manipulation;
        }

        .scroll-top.show {
            opacity: 1;
            transform: translateY(0);
        }

        .scroll-top:hover {
            background: var(--secondary-color);
            transform: translateY(-3px);
        }

        @media (max-width: 1200px) {
            .container {
                padding: 0 10px;
                max-width: 100%;
            }
        }

        @media (max-width: 992px) {
            .container {
                padding: 0 10px;
                max-width: 100%;
            }
            .page-title {
                font-size: 2rem;
            }
            .page-content {
                padding: 20px;
            }
            .no-page-card {
                max-width: 90%;
            }
        }

        @media (max-width: 768px) {
            html, body {
                width: 100%;
                overflow-x: hidden;
            }
            .container {
                padding: 0 10px;
                max-width: 100%;
                width: 100%;
            }
            .nav-container {
                flex-wrap: nowrap;
                align-items: center;
                padding: 8px 10px;
                width: 100%;
                max-width: 100%;
            }
            .nav-menu {
                position: fixed;
                left: -100%;
                top: 70px;
                flex-direction: column;
                background-color: var(--light-color);
                width: 100%;
                max-width: 100%;
                text-align: center;
                transition: 0.3s ease;
                box-shadow: 0 8px 12px rgba(0, 0, 0, 0.1);
                padding: 15px 0;
                z-index: 20;
                overflow-x: hidden;
            }
            .nav-menu.active {
                left: 0;
                width: 100%;
                max-width: 100%;
            }
            .nav-item {
                margin: 15px 0;
            }
            .hamburger {
                display: block;
                font-size: 24px;
                padding: 10px;
                margin-left: auto;
            }
            .page-section {
                padding: 30px 0;
                width: 100%;
                max-width: 100%;
                overflow-x: hidden;
            }
            .page-title {
                font-size: 1.8rem;
            }
            .page-content {
                padding: 16px;
            }
            .page-content h2 {
                font-size: 1.6rem;
            }
            .page-content h3 {
                font-size: 1.3rem;
            }
            .page-content p {
                font-size: 13px;
            }
            .no-page-card {
                padding: 20px;
                max-width: 95%;
            }
            .no-page-card h3 {
                font-size: 1.4rem;
            }
            .no-page-card p {
                font-size: 13px;
            }
            .no-page-card .back-button {
                padding: 8px 16px;
                font-size: 12px;
            }
            .footer-container {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
                padding: 0 10px;
                width: 100%;
                max-width: 100%;
                overflow-x: hidden;
            }
            .footer-column {
                width: 100%;
                max-width: 100%;
                text-align: center;
            }
            .footer-column h3::after {
                margin: 10px auto;
            }
            .footer-links a {
                padding-left: 0;
            }
            .footer-links a::before {
                content: none;
            }
            .social-links {
                justify-content: center;
            }
            .toast {
                max-width: 90%;
                font-size: 12px;
                padding: 8px 16px;
            }
        }

        @media (max-width: 576px) {
            .container {
                padding: 0 10px;
                max-width: 100%;
            }
            .hamburger {
                font-size: 20px;
                padding: 8px;
            }
            .page-section {
                padding: 20px 0;
                width: 100%;
                max-width: 100%;
            }
            .page-title {
                font-size: 1.5rem;
            }
            .page-content {
                padding: 12px;
            }
            .page-content h2 {
                font-size: 1.4rem;
            }
            .page-content h3 {
                font-size: 1.2rem;
            }
            .page-content p {
                font-size: 12px;
            }
            .no-page-card {
                padding: 16px;
                max-width: 90%;
            }
            .no-page-card i {
                font-size: 28px;
                margin-bottom: 12px;
            }
            .no-page-card h3 {
                font-size: 1.2rem;
            }
            .no-page-card p {
                font-size: 12px;
                margin-bottom: 16px;
            }
            .no-page-card .back-button {
                padding: 6px 12px;
                font-size: 11px;
            }
            .no-page-card .back-button i {
                font-size: 11px;
            }
            .footer-container {
                grid-template-columns: 1fr;
                gap: 20px;
                padding: 0 10px;
                width: 100%;
                max-width: 100%;
            }
            .footer-column {
                align-items: center;
            }
            .footer-column h3 {
                font-size: 16px;
            }
            .footer-links a {
                font-size: 12px;
            }
            .social-links {
                justify-content: center;
            }
            .social-link {
                width: 30px;
                height: 30px;
            }
            .copyright {
                font-size: 11px;
            }
            .scroll-top {
                bottom: 15px;
                right: 15px;
                width: 35px;
                height: 35px;
            }
            .toast {
                font-size: 11px;
                padding: 6px 12px;
                max-width: 95%;
            }
        }