:root {
            --bg1: #0a1628;
            --bg2: #0d2137;
            --accent: #4fc3f7;
            --glow: rgba(79,195,247,0.4);
            --text: #ffffff;
            --particle: rgba(79,195,247,0.3);
        }
        body { background: var(--bg1); color: var(--text); }

        .hero { min-height: auto; padding: 20px 20px; }
        .section { padding-top: 22px; }

        .hero-card {
            display: inline-flex;
            flex-direction: column;
            align-items: center;
            background: transparent;
            border: none;
            box-shadow: none;
            animation: cardFloat 6s ease-in-out infinite;
            margin: 6px 0 12px;
        }

        @keyframes cardFloat {
            0%,100% { transform: translateY(0); }
            50% { transform: translateY(-8px); }
        }

        .hero-card img {
            max-height: 360px;
            max-width: 92vw;
            width: auto;
            height: auto;
            border-radius: 24px;
            border: 4px solid var(--accent);
            box-shadow: 0 0 40px var(--glow), 0 0 80px rgba(0,0,0,0.3);
        }

        .hero-card .hero-title {
            margin-top: 10px;
        }

        .hero-title {
            font-size: clamp(2.4rem, 9vw, 4rem);
            background: linear-gradient(135deg, #4fc3f7, #cdeefb, #ffffff, #4fc3f7);
            background-size: 300% 300%;
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            animation: gradientText 24s ease infinite;
        }

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

        .form-card {
            text-align: center;
            background: rgba(255,255,255,0.08);
            backdrop-filter: blur(20px);
            border-radius: 24px;
            padding: 50px 40px;
            max-width: 600px;
            margin: 0 auto;
            border: 1px solid rgba(79,195,247,0.2);
            box-shadow: 0 20px 60px rgba(0,0,0,0.3);
        }

        .form-group {
            margin-bottom: 24px;
        }

        .form-group label {
            display: block;
            font-size: 1rem;
            font-weight: 600;
            color: #ffffff;
            margin-bottom: 8px;
        }

        .form-group input,
        .form-group select {
            width: 100%;
            padding: 14px 18px;
            border-radius: 12px;
            border: 2px solid rgba(79,195,247,0.3);
            background: rgba(255,255,255,0.08);
            color: #ffffff;
            font-size: 1rem;
            font-family: 'Montserrat', sans-serif;
            text-align: center;
            transition: border-color 0.3s, box-shadow 0.3s;
            outline: none;
        }

        .form-group input::placeholder {
            color: rgba(255,255,255,0.4);
        }

        .form-group input:focus,
        .form-group select:focus {
            border-color: var(--accent);
            box-shadow: 0 0 20px var(--glow);
        }

        .form-group select option {
            background: #0d2137;
            color: #ffffff;
        }

        .form-submit {
            width: 100%;
            padding: 16px;
            border: 1px solid rgba(255,255,255,0.15);
            border-radius: 12px;
            font-size: 1.2rem;
            font-weight: 700;
            font-family: 'Montserrat', sans-serif;
            color: #ffffff; /* белый текст */
            background-color: rgba(255,255,255,0.08); /* заливка как у карточек */
            cursor: pointer;
            transition: all 0.4s cubic-bezier(0.25,0.8,0.25,1);
            box-shadow: 0 8px 30px rgba(0,0,0,0.3), 0 0 20px var(--glow);
            margin-top: 10px;
            position: relative;
            overflow: hidden;
        }

        .form-submit::before {
            content: '';
            position: absolute;
            top: 0;
            left: -75%;
            width: 50%;
            height: 100%;
            background: linear-gradient(100deg, transparent 0%, rgba(255,255,255,0.35) 50%, transparent 100%);
            transform: skewX(-20deg);
            animation: btnShine 3s ease-in-out infinite;
        }

        @keyframes btnShine {
            0% { left: -75%; }
            28% { left: 125%; }
            100% { left: 125%; }
        }

        .form-submit:hover {
            transform: translateY(-3px) scale(1.02);
            box-shadow: 0 12px 40px rgba(0,0,0,0.4), 0 0 40px var(--glow);
        }

        /* выбор платформы — круглые иконки с радиокнопками */
        .platform-choice {
            display: flex;
            justify-content: space-evenly;
            align-items: center;
            gap: 12px;
            width: 100%;
            margin-top: 8.4px;
        }

        .platform-opt {
            position: relative;
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
            gap: 8px;
            cursor: pointer;
            min-width: 80px;
        }

        .platform-opt input {
            position: absolute;
            opacity: 0;
            width: 0; height: 0;
            pointer-events: none;
        }

        .platform-ico {
            width: 49px;
            height: 49px;
            box-sizing: border-box;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            border: 2px solid transparent;
            box-shadow: 0 4px 16px rgba(0,0,0,0.35);
            transition: all 0.3s cubic-bezier(0.25,0.8,0.25,1);
            opacity: 0.55;
            margin: 0 auto;
        }

        .platform-ico img {
            display: block;
            width: 45px; height: 45px;
            border-radius: 50%;
        }

        .platform-name {
            font-size: 0.9rem;
            font-weight: 700;
            color: #ffffff;
            transition: color 0.3s;
            width: 100%;
        }

        .platform-opt:hover .platform-ico { opacity: 0.85; transform: translateY(-2px); }

        .platform-opt input:checked ~ .platform-ico {
            opacity: 1;
            border: 1px solid #ccc;
        }

        .platform-opt input:checked ~ .platform-name { color: #ffffff; }

        .platform-opt input:focus-visible ~ .platform-ico { outline: 2px solid #fff; outline-offset: 3px; }

        .benefits {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 20px;
            max-width: 800px;
            margin: 50px auto 0;
        }

        .benefit-card {
            background: rgba(255,255,255,0.06);
            border-radius: 16px;
            padding: 24px;
            text-align: center;
            border: 1px solid rgba(79,195,247,0.15);
            transition: all 0.4s;
        }

        .benefit-card:hover {
            transform: translateY(-5px);
            background: rgba(255,255,255,0.12);
            box-shadow: 0 15px 40px rgba(0,0,0,0.3);
        }

        .benefit-card .icon {
            font-size: 2.5rem;
            margin-bottom: 12px;
        }

        .benefit-card .title {
            font-size: 1rem;
            font-weight: 700;
            color: #ffffff;
        }

        .benefit-card .text {
            font-size: 0.85rem;
            color: #ffffff;
            margin-top: 6px;
        }

        @media (max-width: 768px) {
            .hero-card img { max-height: min(240px, 56vw); max-width: 92vw; }
            .form-card { padding: 26px 16px; }
            .platform-choice { gap: 28px; }
            .benefits { gap: 14px; margin-top: 36px; }
        }

        .nav {
            background: transparent;
            border-bottom: none;
        }

        .nav-logo {
            color: #4fc3f7;
        }

        .nav-links a {
            color: #ffffff;
            border-color: rgba(79,195,247,0.3);
            overflow: visible;
        }

        .nav-links a::before {
            display: none;
        }

        .nav-links a:hover {
            background: rgba(79,195,247,0.2);
            color: #ffffff;
            border-color: rgba(79,195,247,0.6);
            transform: translateY(-2px);
            box-shadow: 0 4px 15px rgba(79,195,247,0.3);
        }

        .footer {
            color: #ffffff;
            border-top: 1px solid rgba(79,195,247,0.15);
        }

        .footer a {
            color: #4fc3f7;
        }