.login-shell {
        max-width: 780px;
        width: min(94vw, 780px);
        margin: 0 auto;
    }

    .login-card {
        width: 100%;
    }
    .signup-hero {
        margin-bottom: 0.4rem;
    }
    .signup-hero-title {
        margin-top: 0.55rem;
    }
    .signup-hero-subtitle {
        max-width: 62ch;
        color: #516684;
    }

    .signup-grid {
        display: grid;
        gap: 0.9rem;
    }

    .signup-section {
        border: 1px solid #d7e4fb;
        border-radius: 14px;
        background: #f8fbff;
        padding: 0.9rem;
    }

    .signup-section-title {
        font-size: 0.9rem;
        font-weight: 700;
        color: #1f4a86;
        margin-bottom: 0.7rem;
    }

    .signup-section .field:last-child {
        margin-bottom: 0;
    }

    .signup-plan-select-native {
        position: absolute !important;
        width: 1px !important;
        height: 1px !important;
        padding: 0 !important;
        margin: -1px !important;
        overflow: hidden !important;
        clip: rect(0, 0, 0, 0) !important;
        white-space: nowrap !important;
        border: 0 !important;
    }

    .signup-plan-options {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
        gap: 0.52rem;
    }

    .signup-plan-radio {
        position: absolute;
        opacity: 0;
        pointer-events: none;
    }

    .signup-plan-option {
        margin: 0;
        border: 1px solid #c8daf8;
        border-radius: 11px;
        background: linear-gradient(180deg, #ffffff 0%, #f4f9ff 100%);
        color: #1f3556;
        font-size: 0.84rem;
        font-weight: 700;
        line-height: 1.3;
        padding: 0.52rem 0.64rem;
        cursor: pointer;
        transition: border-color 0.18s ease, box-shadow 0.18s ease, transform 0.12s ease;
    }

    .signup-plan-option:hover {
        border-color: #9fc2fb;
        box-shadow: 0 7px 13px rgba(31, 111, 235, 0.10);
        transform: translateY(-1px);
    }

    .signup-plan-radio:checked + .signup-plan-option {
        border-color: #facc15;
        background: linear-gradient(135deg, #fff7c7, #fde68a);
        color: #5a3b00;
        box-shadow: 0 8px 14px rgba(234, 179, 8, 0.24);
    }

    .signup-fields-grid {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 0.55rem 0.8rem;
        align-items: start;
    }

    .signup-fields-grid .field {
        margin-bottom: 0;
    }

    .signup-access-grid {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 0.55rem 0.8rem;
        align-items: start;
    }

    .signup-access-grid .field {
        margin-bottom: 0;
    }

    .field-span-2 {
        grid-column: 1 / -1;
    }

    @media (max-width: 575.98px) {
        .signup-access-grid,
        .signup-fields-grid {
            grid-template-columns: 1fr;
        }

        .field-span-2 {
            grid-column: auto;
        }
    }

    .signup-loading-overlay {
        position: fixed;
        inset: 0;
        z-index: 3000;
        display: none !important;
        align-items: center;
        justify-content: center;
        background: rgba(6, 18, 38, 0.62);
        backdrop-filter: blur(2px);
    }

    .signup-loading-overlay.is-visible {
        display: flex !important;
    }

    .signup-loading-dialog {
        width: min(92vw, 420px);
        border-radius: 14px;
        border: 1px solid #234f95;
        background: linear-gradient(145deg, #0b2a58, #0d3a76);
        box-shadow: 0 22px 48px rgba(3, 12, 27, 0.45);
        padding: 1rem 1rem 0.9rem;
        text-align: center;
    }

    .signup-spinner {
        width: 42px;
        height: 42px;
        display: block;
        position: relative;
        border-radius: 999px;
        margin: 0 auto 0.65rem;
        border: 4px solid rgba(179, 215, 255, 0.28);
        border-top-color: #8cc6ff;
        border-right-color: #39b8ff;
        box-shadow: 0 0 18px rgba(83, 176, 255, 0.18);
        animation: signup-spin 0.85s linear infinite;
        will-change: transform;
    }

    .signup-spinner::after {
        content: "";
        position: absolute;
        inset: 9px;
        border-radius: 999px;
        background: radial-gradient(circle at 35% 35%, #dff4ff, #4bb3ff 58%, #1f63d6 100%);
    }

    .signup-loading-text {
        margin: 0;
        color: #e6f2ff;
        font-size: 0.93rem;
        font-weight: 600;
        line-height: 1.35;
    }

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