*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        [hidden] { display: none !important; }

        :root {
            --login-primary: #1a5c96;
            --login-primary-dark: #134979;
            --login-primary-light: #e3eef7;
            --login-bg: #f0f3f7;
            --login-card-bg: #fff;
            --login-border: #dae1e9;
            --login-text: #1e2d3d;
            --login-text-sub: #5a6d7e;
            --login-danger: #c0392b;
            --login-danger-bg: #fdf0ef;
            --login-radius: 16px;
            --login-shadow: 0 4px 24px rgba(26, 92, 150, .08), 0 1px 3px rgba(0,0,0,.06);
            --avatar-colors: #1a5c96, #2e86c1, #148f77, #b9770e, #6c3483, #c0392b, #117864, #1f618d;
        }

        body {
            font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
            background: var(--login-bg);
            color: var(--login-text);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
            background-image:
                radial-gradient(ellipse at 20% 50%, rgba(26,92,150,.06) 0%, transparent 60%),
                radial-gradient(ellipse at 80% 20%, rgba(46,134,193,.05) 0%, transparent 50%);
        }

        /* ---- Card ---- */
        .login-card {
            background: var(--login-card-bg);
            border: 1px solid var(--login-border);
            border-radius: var(--login-radius);
            box-shadow: var(--login-shadow);
            width: 400px;
            max-width: 100%;
            overflow: hidden;
        }

        .login-card.hidden-until-ready {
            visibility: hidden;
            position: relative;
        }

        .login-card-inner {
            padding: 40px 36px 36px;
        }

        /* ---- Header ---- */
        .login-header {
            text-align: center;
            margin-bottom: 28px;
        }

        .login-logo {
            display: block;
            width: 190px;
            max-width: 70%;
            height: auto;
            margin-left: auto;
            margin-right: auto;
            margin-bottom: 16px;
        }

        .login-title {
            font-size: 22px;
            font-weight: 700;
            color: var(--login-text);
            margin-bottom: 6px;
        }

        .login-subtitle {
            font-size: 14px;
            color: var(--login-text-sub);
            font-weight: 400;
        }

        /* ---- Steps container ---- */
        .login-steps {
            position: relative;
            overflow: hidden;
        }

        .login-step {
            display: none;
            animation: stepIn .3s ease-out;
        }

        .login-step.active {
            display: block;
        }

        @keyframes stepIn {
            from { opacity: 0; transform: translateX(30px); }
            to   { opacity: 1; transform: translateX(0); }
        }

        @keyframes stepBack {
            from { opacity: 0; transform: translateX(-30px); }
            to   { opacity: 1; transform: translateX(0); }
        }

        .login-step.back {
            animation-name: stepBack;
        }

        /* ---- Account list ---- */
        .account-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .account-item {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 14px;
            border-radius: 10px;
            cursor: pointer;
            transition: background .15s;
            position: relative;
        }

        .account-item:hover {
            background: var(--login-primary-light);
        }

        .account-item .account-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 600;
            font-size: 16px;
            flex-shrink: 0;
            text-transform: uppercase;
        }

        .account-item .account-info {
            flex: 1;
            min-width: 0;
        }

        .account-item .account-email {
            font-size: 14px;
            font-weight: 500;
            color: var(--login-text);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .account-remove {
            width: 32px;
            height: 32px;
            border: none;
            background: transparent;
            border-radius: 50%;
            cursor: pointer;
            color: #a0aab4;
            font-size: 18px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            transition: background .15s, color .15s;
            opacity: 0;
        }

        .account-item:hover .account-remove {
            opacity: 1;
        }

        .account-remove:hover {
            background: var(--login-danger-bg);
            color: var(--login-danger);
        }

        /* Remove confirm tooltip */
        .remove-confirm {
            position: absolute;
            right: 8px;
            top: 50%;
            transform: translateY(-50%);
            background: #fff;
            border: 1px solid var(--login-border);
            border-radius: 10px;
            padding: 10px 14px;
            box-shadow: 0 4px 16px rgba(0,0,0,.12);
            display: none;
            z-index: 10;
            white-space: nowrap;
            animation: fadeScale .15s ease-out;
        }

        .remove-confirm.show { display: flex; align-items: center; gap: 8px; }

        @keyframes fadeScale {
            from { opacity: 0; transform: translateY(-50%) scale(.95); }
            to   { opacity: 1; transform: translateY(-50%) scale(1); }
        }

        .remove-confirm span {
            font-size: 12px;
            color: var(--login-text-sub);
            font-weight: 500;
        }

        .remove-confirm button {
            padding: 4px 12px;
            border-radius: 6px;
            font-size: 12px;
            font-weight: 600;
            cursor: pointer;
            border: 1px solid var(--login-border);
            background: #fff;
            color: var(--login-text-sub);
            transition: background .1s;
        }

        .remove-confirm button:hover { background: #f5f5f5; }

        .remove-confirm .btn-confirm-remove {
            background: var(--login-danger);
            color: #fff;
            border-color: var(--login-danger);
        }

        .remove-confirm .btn-confirm-remove:hover {
            background: #a93226;
        }

        /* ---- Separator ---- */
        .account-separator {
            height: 1px;
            background: var(--login-border);
            margin: 8px 0;
        }

        /* ---- "Usa un altro account" ---- */
        .account-item.add-account {
            color: var(--login-primary);
        }

        .account-item.add-account .account-avatar {
            background: var(--login-primary-light);
            color: var(--login-primary);
            font-size: 22px;
            font-weight: 400;
        }

        .account-item.add-account .account-email {
            color: var(--login-primary);
            font-weight: 600;
        }

        /* ---- Selected account (step 2) ---- */
        .selected-account {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 14px;
            border: 1px solid var(--login-border);
            border-radius: 10px;
            margin-bottom: 24px;
            cursor: pointer;
            transition: background .15s, border-color .15s;
        }

        .selected-account:hover {
            background: #fafbfc;
            border-color: var(--login-primary);
        }

        .selected-account .account-avatar {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 600;
            font-size: 13px;
            flex-shrink: 0;
            text-transform: uppercase;
        }

        .selected-account .account-email {
            flex: 1;
            font-size: 13px;
            font-weight: 500;
            color: var(--login-text);
            min-width: 0;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        .selected-account .change-icon {
            color: #a0aab4;
            font-size: 18px;
            flex-shrink: 0;
            transition: color .15s;
        }

        .selected-account:hover .change-icon {
            color: var(--login-primary);
        }

        /* ---- Form fields ---- */
        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            font-size: 13px;
            font-weight: 600;
            color: var(--login-text-sub);
            margin-bottom: 6px;
        }

        .form-group input {
            width: 100%;
            padding: 12px 14px;
            border: 1.5px solid var(--login-border);
            border-radius: 10px;
            font-size: 15px;
            font-family: inherit;
            color: var(--login-text);
            background: #fff;
            transition: border-color .2s, box-shadow .2s;
            outline: none;
        }

        .form-group input:focus {
            border-color: var(--login-primary);
            box-shadow: 0 0 0 3px rgba(26, 92, 150, .1);
        }

        .form-group input.input-error {
            border-color: var(--login-danger);
            box-shadow: 0 0 0 3px rgba(192, 57, 43, .08);
        }

        /* ---- Buttons ---- */
        .btn-login {
            width: 100%;
            padding: 12px 20px;
            background: var(--login-primary);
            color: #fff;
            border: none;
            border-radius: 10px;
            font-size: 15px;
            font-weight: 600;
            font-family: inherit;
            cursor: pointer;
            transition: background .15s, transform .1s;
        }

        .btn-login:hover { background: var(--login-primary-dark); }

        .btn-login:active { transform: scale(.985); }

        .btn-login:disabled {
            opacity: .6;
            cursor: not-allowed;
            transform: none;
        }

        /* Loading spinner on button */
        .btn-login.loading {
            position: relative;
            color: transparent;
            pointer-events: none;
        }

        .btn-login.loading::after {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 20px;
            height: 20px;
            margin: -10px 0 0 -10px;
            border: 2.5px solid rgba(255,255,255,.3);
            border-top-color: #fff;
            border-radius: 50%;
            animation: spin .5s linear infinite;
        }

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

        /* ---- OTP (codice 2FA) ---- */
        .otp-hint {
            font-size: 13px;
            color: var(--login-text-sub);
            line-height: 1.5;
            margin-bottom: 16px;
        }

        .otp-input {
            text-align: center;
            font-size: 26px;
            font-weight: 600;
            letter-spacing: 10px;
            padding-left: 24px; /* compensa il letter-spacing per restare centrato */
        }

        .otp-remember {
            display: flex;
            align-items: center;
            gap: 8px;
            margin: -4px 0 18px;
            font-size: 13px;
            color: var(--login-text-sub);
            cursor: pointer;
            user-select: none;
        }

        .otp-remember input {
            width: 16px;
            height: 16px;
            accent-color: var(--login-primary);
            cursor: pointer;
        }

        .otp-resend {
            display: block;
            width: 100%;
            margin-top: 14px;
            font-size: 13px;
            font-weight: 500;
            font-family: inherit;
            color: var(--login-primary);
            background: none;
            border: none;
            padding: 0;
            cursor: pointer;
            text-align: center;
            transition: opacity .15s;
        }

        .otp-resend:hover:not(:disabled) { opacity: .75; }
        .otp-resend:disabled { color: #a0aab4; cursor: default; }

        /* ---- Link/back ---- */
        .login-registrati {
            font-size: 13px;
            color: var(--login-muted, #6b7280);
            margin-top: 18px;
        }

        .login-registrati a {
            color: var(--login-primary);
            font-weight: 500;
        }

        .login-back {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            color: var(--login-primary);
            font-weight: 500;
            cursor: pointer;
            border: none;
            background: none;
            padding: 0;
            font-family: inherit;
            margin-top: 16px;
            transition: opacity .15s;
        }

        .login-back:hover { opacity: .75; }

        .login-back svg {
            width: 16px;
            height: 16px;
        }

        /* ---- Error message ---- */
        .login-error {
            font-size: 13px;
            color: var(--login-danger);
            background: var(--login-danger-bg);
            padding: 10px 14px;
            border-radius: 8px;
            margin-bottom: 16px;
            display: none;
            animation: stepIn .2s ease-out;
        }

        .login-error.show { display: block; }

        /* ---- Footer ---- */
        .login-footer {
            text-align: center;
            padding: 16px 36px;
            border-top: 1px solid var(--login-border);
            background: #fafbfc;
        }

        .login-footer span {
            font-size: 12px;
            color: #a0aab4;
            font-weight: 400;
        }

        /* Palette deterministica degli account: classi al posto dello style inline,
           così la CSP della login può vietare completamente gli stili incorporati. */
        .avatar-color-0 { background: #1a5c96; }
        .avatar-color-1 { background: #2e86c1; }
        .avatar-color-2 { background: #148f77; }
        .avatar-color-3 { background: #b9770e; }
        .avatar-color-4 { background: #6c3483; }
        .avatar-color-5 { background: #c0392b; }
        .avatar-color-6 { background: #117864; }
        .avatar-color-7 { background: #1f618d; }