:root {
            --dark-blue: #001a33;
            --accent-blue: #3498db;
            --turquoise: #40e0d0;
            --black: #0a0a0a;
            --dark-black: #000;
            --darker-black: #080808;
            --white: #f5f5f5;
            --light-gray: #a0a0a0;
            --error-red: #e74c3c;
            --success-green: #2ecc71;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
            --transition: all 0.3s ease;
        }

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

        body {
            font-family: 'Open Sans', sans-serif;
            background-color: var(--dark-black);
            color: var(--white);
            line-height: 1.6;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* Шапка сайта */
        header {
            background: linear-gradient(135deg, var(--dark-blue), var(--black));
            color: var(--white);
            padding: 2rem 1.5rem;
            text-align: center;
            box-shadow: var(--shadow);
            position: relative;
            overflow: hidden;
            border-bottom: 1px solid rgba(52, 152, 219, 0.2);
        }

        header::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-image:
                linear-gradient(rgba(52, 152, 219, 0.1) 1px, transparent 1px),
                linear-gradient(90deg, rgba(52, 152, 219, 0.1) 1px, transparent 1px);
            background-size: 20px 20px;
            pointer-events: none;
        }

        header h1 {
            font-family: 'Roboto', sans-serif;
            font-size: 2.8rem;
            font-weight: 700;
            letter-spacing: 1px;
            margin-bottom: 0.8rem;
            text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
            background: linear-gradient(to right, var(--accent-blue), var(--turquoise));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }

        .slogan {
            font-size: 1.2rem;
            font-weight: 300;
            color: var(--light-gray);
            max-width: 700px;
            margin: 0 auto;
        }

        /* Основное содержимое */
        main {
            max-width: 600px;
            margin: 3rem auto;
            padding: 0 1.5rem;
            flex-grow: 1;
            width: 100%;
        }

        .registration-container {
            background: linear-gradient(145deg, #121212, #080808);
            border-radius: 12px;
            padding: 2.5rem;
            box-shadow: var(--shadow);
            border: 1px solid rgba(52, 152, 219, 0.1);
            position: relative;
            margin-bottom: 3rem;
        }

        .registration-container::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-image:
                linear-gradient(rgba(52, 152, 219, 0.05) 1px, transparent 1px),
                linear-gradient(90deg, rgba(52, 152, 219, 0.05) 1px, transparent 1px);
            background-size: 25px 25px;
            pointer-events: none;
        }

        .section-title {
            text-align: center;
            margin-bottom: 2rem;
            font-size: 2rem;
            color: var(--white);
            font-weight: 300;
            position: relative;
        }

        .section-title::after {
            content: "";
            display: block;
            width: 80px;
            height: 4px;
            background: linear-gradient(90deg, var(--accent-blue), var(--turquoise));
            margin: 0.8rem auto 0;
            border-radius: 2px;
        }

        .form-group {
            margin-bottom: 1.5rem;
            position: relative;
        }

        .form-label {
            display: block;
            margin-bottom: 0.5rem;
            color: var(--light-gray);
            font-size: 0.95rem;
        }

        .form-control {
            width: 100%;
            background: rgba(20, 20, 20, 0.5);
            border: 1px solid rgba(52, 152, 219, 0.2);
            color: var(--white);
            padding: 0.9rem 1.2rem;
            border-radius: 8px;
            font-size: 1rem;
            transition: var(--transition);
        }

        .form-control:focus {
            border-color: var(--accent-blue);
            outline: none;
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
        }

        .form-control::placeholder {
            color: var(--light-gray);
            opacity: 0.6;
        }

        .input-icon {
            position: absolute;
            right: 15px;
            top: 40px;
            color: var(--light-gray);
        }

        .name-group {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
        }

        .checkbox-group {
            display: flex;
            align-items: flex-start;
            margin-top: 2rem;
        }

        .form-check {
            margin-right: 0.8rem;
            margin-top: 0.2rem;
        }

        .form-check-input {
            width: 20px;
            height: 20px;
            background: rgba(20, 20, 20, 0.5);
            border: 1px solid rgba(52, 152, 219, 0.2);
            border-radius: 4px;
            appearance: none;
            position: relative;
            cursor: pointer;
            transition: var(--transition);
        }

        .form-check-input:checked {
            background: var(--accent-blue);
            border-color: var(--accent-blue);
        }

        .form-check-input:checked::after {
            content: "\f00c";
            font-family: "Font Awesome 5 Free";
            font-weight: 900;
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            color: white;
            font-size: 0.8rem;
        }

        .form-check-label {
            color: var(--light-gray);
            font-size: 0.9rem;
            line-height: 1.5;
        }

        .form-check-label a {
            color: var(--turquoise);
            text-decoration: none;
            transition: var(--transition);
        }

        .form-check-label a:hover {
            text-decoration: underline;
        }

        .input-error {
            color: var(--error-red);
            font-size: 0.85rem;
            margin-top: 0.4rem;
            display: block;
        }

        .non-field-errors {
            background: rgba(231, 76, 60, 0.1);
            border-radius: 8px;
            padding: 1rem;
            margin-bottom: 1.5rem;
            text-align: center;
            color: var(--error-red);
        }

        .btn-primary {
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, var(--accent-blue), var(--turquoise));
            color: var(--white);
            padding: 1rem;
            border-radius: 10px;
            text-decoration: none;
            font-weight: bold;
            transition: var(--transition);
            text-align: center;
            position: relative;
            overflow: hidden;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
            border: none;
            cursor: pointer;
            z-index: 1;
            font-size: 1.1rem;
            width: 100%;
            margin-top: 2rem;
        }

        .btn-primary::before {
            content: "";
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
            transition: var(--transition);
            z-index: -1;
        }

        .btn-primary:hover {
            box-shadow: 0 6px 20px rgba(52, 152, 219, 0.5);
            transform: translateY(-3px);
        }

        .btn-primary:hover::before {
            left: 100%;
        }

        .btn-primary i {
            margin-right: 10px;
            font-size: 1.2rem;
        }

        .login-link {
            text-align: center;
            margin-top: 1.5rem;
            color: var(--light-gray);
            font-size: 0.95rem;
        }

        .login-link a {
            color: var(--turquoise);
            text-decoration: none;
            transition: var(--transition);
            font-weight: 600;
        }

        .login-link a:hover {
            text-decoration: underline;
        }

        /* Эффекты свечения */
        .glow {
            position: fixed;
            width: 100%;
            height: 100%;
            top: 0;
            left: 0;
            pointer-events: none;
            z-index: -1;
        }

        .glow-1 {
            position: absolute;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(52, 152, 219, 0.15) 0%, transparent 70%);
            top: 20%;
            left: 10%;
            filter: blur(80px);
        }

        .glow-2 {
            position: absolute;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(64, 224, 208, 0.1) 0%, transparent 70%);
            bottom: 10%;
            right: 10%;
            filter: blur(60px);
        }

        footer {
            background: rgba(10, 10, 10, 0.8);
            padding: 1.5rem;
            text-align: center;
            border-top: 1px solid rgba(52, 152, 219, 0.1);
            color: var(--light-gray);
            font-size: 0.9rem;
        }

        footer p {
            margin: 0.5rem 0;
        }

        /* Адаптивность */
        @media (max-width: 768px) {
            .registration-container {
                padding: 1.8rem;
            }

            .section-title {
                font-size: 1.8rem;
            }

            .name-group {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
        }

        @media (max-width: 480px) {
            header h1 {
                font-size: 2.2rem;
            }

            .slogan {
                font-size: 1rem;
            }

            .section-title {
                font-size: 1.6rem;
            }

            .form-control {
                padding: 0.8rem 1rem;
            }

            .registration-container {
                padding: 1.5rem;
            }
        }

        /* Анимация загрузки */
        .loading-spinner {
            display: none;
            width: 20px;
            height: 20px;
            border: 3px solid rgba(255, 255, 255, 0.3);
            border-radius: 50%;
            border-top-color: white;
            animation: spin 1s ease-in-out infinite;
            margin-right: 10px;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }