:root {
            --bg: #0b1220;
            --card: #0f1a33;
            --text: #e6eefb;
            --muted: #9fb0cc;
            --primary: #4f7cff;
            --primary-strong: #3b66e6;
            --danger: #ff5a79;
            --ring: rgba(79, 124, 255, 0.45);
            --radius: 20px;
        }

        * {
            box-sizing: border-box;
        }

        html,
        body {
            height: 100%;
        }

        body {
            margin: 0;
            font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
            background: radial-gradient(1200px 700px at 80% -10%, #1a2a5e33, transparent),
                radial-gradient(900px 500px at -10% 110%, #2a446a33, transparent),
                var(--bg);
            color: var(--text);
            display: grid;
            place-items: center;
            padding: 24px;
        }

        .card {
            width: 100%;
            max-width: 420px;
            background: linear-gradient(180deg, #0f1a33, #0e1730);
            border: 1px solid #23325a;
            border-radius: var(--radius);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.04);
            overflow: hidden;
            position: relative;
        }

        .card::before {
            content: "";
            position: absolute;
            inset: 0;
            background: radial-gradient(200px 120px at 85% 10%, #4f7cff22, transparent);
            pointer-events: none;
        }

        .header {
            padding: 28px 28px 8px;
        }

        .title {
            margin: 0 0 6px;
            font-size: 28px;
            line-height: 1.2;
            letter-spacing: 0.3px;
        }

        .subtitle {
            margin: 0;
            color: var(--muted);
            font-size: 14px;
        }

        form {
            padding: 22px 28px 28px;
            display: grid;
            gap: 16px;
        }

        .field {
            display: grid;
            gap: 8px;
        }

        label {
            font-size: 14px;
            color: var(--muted);
        }

        .input-wrap {
            position: relative;
        }

        input[type="text"],
        input[type="password"], 
        input[type="email"] {
            width: 100%;
            padding: 12px 44px 12px 12px;
            border-radius: 12px;
            border: 1px solid #2a3a66;
            background: #0c1530;
            color: var(--text);
            outline: none;
            font-size: 16px;
            transition: border-color .15s ease, box-shadow .15s ease;
        }

        input::placeholder {
            color: #90a3c6;
        }

        input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 4px var(--ring);
        }

        .toggle-visibility {
            position: absolute;
            right: 10px;
            top: 50%;
            transform: translateY(-50%);
            border: 0;
            background: transparent;
            color: var(--muted);
            cursor: pointer;
            padding: 6px 8px;
            border-radius: 8px;
        }

        .toggle-visibility:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

        .row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            margin-top: 2px;
        }

        .btn {
            appearance: none;
            border: 0;
            border-radius: 12px;
            padding: 12px 14px;
            font-weight: 600;
            font-size: 16px;
            cursor: pointer;
            transition: transform .02s ease, filter .15s ease, box-shadow .15s ease;
            box-shadow: 0 8px 20px rgba(79, 124, 255, .28);
            background: linear-gradient(180deg, var(--primary), var(--primary-strong));
            color: white;
            width: 100%;
        }

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

        .link {
            color: var(--primary);
            text-decoration: none;
            font-size: 14px;
        }

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

        .error2 {
            display: none;
            color: var(--danger);
            font-size: 13px;
        }

        .footer {
            padding: 16px 28px 24px;
            color: var(--muted);
            font-size: 12px;
            border-top: 1px solid #1c2950;
        }

        @media (max-width: 420px) {
            .title {
                font-size: 24px;
            }
        }