*,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        body {
            margin: 0;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #0d0d0d, #1a0033);
            color: #fff;

            min-height: 100svh;
            display: flex;
            flex-direction: column;
            align-items: center;

            text-align: center;
            opacity: 0;
            animation: fadeIn 1.0s ease forwards;
            padding-inline: 12px;
        }

        /* Fade-in */
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(12px)
            }

            to {
                opacity: 1;
                transform: none
            }
        }

        /* Header */
        .site-header {
            position: absolute;
            top: 20px;
            left: 30px;
            z-index: 1000;
        }

        .branding-box {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 16px;
            background: rgba(255, 255, 255, .05);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(192, 132, 252, .25);
            border-radius: 18px;
            box-shadow: 0 0 15px rgba(192, 132, 252, .1);
            transition: transform .3s ease, box-shadow .3s ease;
        }

        .branding-box:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 20px rgba(192, 132, 252, .25);
        }

        .branding-box img {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            object-fit: cover;
        }

        .brand-name {
            font-size: 1.1em;
            font-weight: 700;
            letter-spacing: .5px;
        }

        .container {
            width: min(500px, 100%);
            padding: 24px 16px;
            margin-top: 72px;
            margin-bottom: 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }

        img.logo {
            width: 200px;
            margin-bottom: 12px;
            border-radius: 50%;
            animation: floatLogo 3s ease-in-out infinite;
            transition: transform .25s ease, box-shadow .25s ease;
        }

        img.logo:hover {
            transform: scale(1.06);
            box-shadow: 0 0 24px rgba(192, 132, 252, .65);
        }

        @keyframes floatLogo {

            0%,
            100% {
                transform: translateY(0)
            }

            50% {
                transform: translateY(-10px)
            }
        }

        @keyframes fly {
            0% {
                transform: translateY(0) rotate(0deg);
            }

            50% {
                transform: translateY(-12px) rotate(-15deg);
            }

            100% {
                transform: translateY(0) rotate(0deg);
            }
        }



        h1 {
            font-size: 2rem;
            margin: 6px 0 8px;
            color: #c084fc;
        }

        p {
            font-size: 1.05rem;
            opacity: .85;
            line-height: 1.55;
        }

        .rocket {
            display: inline-block;
            font-size: 1.4em;
            animation: fly 3s infinite ease-in-out;
        }

        /* Early Bird form */
        .early {
            margin-top: 12px;
            width: 100%;
            background: rgba(255, 255, 255, .06);
            border: 1px solid rgba(192, 132, 252, .25);
            backdrop-filter: blur(8px);
            padding: 18px;
            border-radius: 16px;
            text-align: left;
        }

        .early h3 {
            margin: 0 0 10px;
            font-size: 1.05rem;
            color: #e9d5ff;
        }

        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
        }

        .field {
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        label {
            font-size: .85rem;
            opacity: .85;
        }

        input,
        textarea {
            background: rgba(0, 0, 0, .35);
            color: #fff;
            border: 1px solid rgba(192, 132, 252, .3);
            border-radius: 12px;
            padding: 10px 12px;
            font-size: .95rem;
            outline: none;
            transition: border-color .2s ease, box-shadow .2s ease;
            width: 100%;
        }

        input:focus,
        textarea:focus {
            border-color: #c084fc;
            box-shadow: 0 0 0 3px rgba(192, 132, 252, .25)
        }

        textarea {
            min-height: 90px;
            resize: vertical;
        }

        .consent {
            display: grid;
            grid-template-columns: 1.1rem 1fr;
            /* checkbox | text */
            gap: 10px;
            align-items: center;
            /* τέλεια κάθετη στοίχιση */
            font-size: .85rem;
            margin: 8px 0 2px;
            opacity: .9;
        }

        .consent input[type="checkbox"] {
            width: 1.1rem;
            height: 1.1rem;
            margin: 0;
            accent-color: #7c3aed;
        }

        .btn {
            width: 100%;
            margin-top: 10px;
            background: linear-gradient(135deg, #a855f7, #7c3aed);
            border: none;
            color: #fff;
            font-weight: 700;
            padding: 12px 16px;
            border-radius: 12px;
            cursor: pointer;
            transition: transform .15s ease, box-shadow .2s ease, opacity .2s ease;
        }

        .btn:hover {
            transform: translateY(-1px);
            box-shadow: 0 8px 20px rgba(124, 58, 237, .35);
        }

        .btn:disabled {
            opacity: .6;
            cursor: not-allowed
        }

        .hint {
            font-size: .8rem;
            opacity: .75;
            margin-top: 6px
        }

        .success,
        .error {
            display: none;
            margin-top: 10px;
            padding: 10px 12px;
            border-radius: 10px;
            font-size: .9rem
        }

        .success {
            background: rgba(34, 197, 94, .15);
            border: 1px solid rgba(34, 197, 94, .35);
            color: #bbf7d0
        }

        .error {
            background: rgba(239, 68, 68, .15);
            border: 1px solid rgba(239, 68, 68, .35);
            color: #fecaca
        }

        footer {
            font-size: .9rem;
            opacity: .7;
            padding: 16px 0;
            width: 100%;
        }

        /* ---------- Responsive ---------- */
        @media (max-width: 768px) {

            .site-header {
                position: static;
                display: flex;
                justify-content: start;
                margin-top: 25px;
                margin-left: 23px;
                left: 100px;
                width: 100%;

            }

            .container {
                margin-top: 18px;
                margin-bottom: 12px;
                width: min(92%, 560px);
            }

            img.logo {
                width: 150px;
            }

            h1 {
                font-size: 1.6rem;
            }

            p {
                font-size: 1rem;
            }

            .form-row {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 480px) {
            img.logo {
                width: 120px;
            }

            h1 {
                font-size: 1.4rem;
            }

            p {
                font-size: .95rem;
            }
        }

        @media (max-width: 480px) {
            .rocket {
                margin-top: 10px;
            }
        }